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gecko-dev/build/debian-packages/valgrind-wheezy.diff
Mike Hommey 4f2f1a88f6 Bug 1429685 - Build a Valgrind package for Debian wheezy. r=dustin 
Apply the patch from bug 1382280 (build/valgrind/valgrind-epochs.patch).

--HG--
extra : rebase_source : 283dbc749e231bc00ea3135423e1606161f0bcd4
2018-01-11 16:06:45 +09:00

4822 lines
207 KiB
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diff -Nru valgrind-3.13.0/debian/changelog valgrind-3.13.0/debian/changelog
--- valgrind-3.13.0/debian/changelog 2017-07-24 08:41:05.000000000 +0900
+++ valgrind-3.13.0/debian/changelog 2018-01-11 17:08:25.000000000 +0900
@@ -1,3 +1,13 @@
+valgrind (1:3.13.0-1.deb7moz1) wheezy; urgency=medium
+
+ * Mozilla backport for wheezy.
+ * debian/patches/valgrind-epochs.patch: Apply patch from Julian Seward that
+ allows us to write a suppression for a leak in a library that gets
+ unloaded before shutdown.
+ Ref: https://bugs.kde.org/show_bug.cgi?id=79362
+
+ -- Mike Hommey <glandium@debian.org> Thu, 11 Jan 2018 17:08:25 +0900
+
valgrind (1:3.13.0-1) unstable; urgency=medium
* New upstream release
diff -Nru valgrind-3.13.0/debian/patches/series valgrind-3.13.0/debian/patches/series
--- valgrind-3.13.0/debian/patches/series 2017-07-24 08:41:05.000000000 +0900
+++ valgrind-3.13.0/debian/patches/series 2018-01-11 17:08:25.000000000 +0900
@@ -4,3 +4,4 @@
07_fix-spelling-in-binary.patch
08_fix-spelling-in-manpage.patch
09_fix-armhf-detect.patch
+valgrind-epochs.patch
diff -Nru valgrind-3.13.0/debian/patches/valgrind-epochs.patch valgrind-3.13.0/debian/patches/valgrind-epochs.patch
--- valgrind-3.13.0/debian/patches/valgrind-epochs.patch 1970-01-01 09:00:00.000000000 +0900
+++ valgrind-3.13.0/debian/patches/valgrind-epochs.patch 2018-01-11 17:08:25.000000000 +0900
@@ -0,0 +1,4792 @@
+Index: valgrind-3.13.0/Makefile.am
+===================================================================
+--- valgrind-3.13.0.orig/Makefile.am
++++ valgrind-3.13.0/Makefile.am
+@@ -16,6 +16,10 @@ EXP_TOOLS = exp-sgcheck \
+ exp-bbv \
+ exp-dhat
+
++#TOOLS = none memcheck
++#EXP_TOOLS =
++
++
+ # Put docs last because building the HTML is slow and we want to get
+ # everything else working before we try it.
+ SUBDIRS = \
+Index: valgrind-3.13.0/cachegrind/cg_main.c
+===================================================================
+--- valgrind-3.13.0.orig/cachegrind/cg_main.c
++++ valgrind-3.13.0/cachegrind/cg_main.c
+@@ -210,12 +210,14 @@ static HChar* get_perm_string(const HCha
+ static void get_debug_info(Addr instr_addr, const HChar **dir,
+ const HChar **file, const HChar **fn, UInt* line)
+ {
++ DiEpoch ep = VG_(current_DiEpoch)();
+ Bool found_file_line = VG_(get_filename_linenum)(
++ ep,
+ instr_addr,
+ file, dir,
+ line
+ );
+- Bool found_fn = VG_(get_fnname)(instr_addr, fn);
++ Bool found_fn = VG_(get_fnname)(ep, instr_addr, fn);
+
+ if (!found_file_line) {
+ *file = "???";
+Index: valgrind-3.13.0/callgrind/bb.c
+===================================================================
+--- valgrind-3.13.0.orig/callgrind/bb.c
++++ valgrind-3.13.0/callgrind/bb.c
+@@ -199,7 +199,8 @@ obj_node* obj_of_address(Addr addr)
+ DebugInfo* di;
+ PtrdiffT offset;
+
+- di = VG_(find_DebugInfo)(addr);
++ DiEpoch ep = VG_(current_DiEpoch)();
++ di = VG_(find_DebugInfo)(ep, addr);
+ obj = CLG_(get_obj_node)( di );
+
+ /* Update symbol offset in object if remapped */
+Index: valgrind-3.13.0/callgrind/dump.c
+===================================================================
+--- valgrind-3.13.0.orig/callgrind/dump.c
++++ valgrind-3.13.0/callgrind/dump.c
+@@ -373,7 +373,8 @@ Bool get_debug_pos(BBCC* bbcc, Addr addr
+ found_file_line = debug_cache_info[cachepos];
+ }
+ else {
+- found_file_line = VG_(get_filename_linenum)(addr,
++ DiEpoch ep = VG_(current_DiEpoch)();
++ found_file_line = VG_(get_filename_linenum)(ep, addr,
+ &file,
+ &dir,
+ &(p->line));
+Index: valgrind-3.13.0/callgrind/fn.c
+===================================================================
+--- valgrind-3.13.0.orig/callgrind/fn.c
++++ valgrind-3.13.0/callgrind/fn.c
+@@ -434,17 +434,18 @@ Bool CLG_(get_debug_info)(Addr instr_add
+
+ CLG_DEBUG(6, " + get_debug_info(%#lx)\n", instr_addr);
+
++ DiEpoch ep = VG_(current_DiEpoch)();
+ if (pDebugInfo) {
+- *pDebugInfo = VG_(find_DebugInfo)(instr_addr);
++ *pDebugInfo = VG_(find_DebugInfo)(ep, instr_addr);
+
+ // for generated code in anonymous space, pSegInfo is 0
+ }
+
+- found_file_line = VG_(get_filename_linenum)(instr_addr,
++ found_file_line = VG_(get_filename_linenum)(ep, instr_addr,
+ file,
+ dir,
+ &line);
+- found_fn = VG_(get_fnname)(instr_addr, fn_name);
++ found_fn = VG_(get_fnname)(ep, instr_addr, fn_name);
+
+ if (!found_file_line && !found_fn) {
+ CLG_(stat).no_debug_BBs++;
+@@ -503,6 +504,7 @@ fn_node* CLG_(get_fn_node)(BB* bb)
+ CLG_(get_debug_info)(bb_addr(bb),
+ &dirname, &filename, &fnname, &line_num, &di);
+
++ DiEpoch ep = VG_(current_DiEpoch)();
+ if (0 == VG_(strcmp)(fnname, "???")) {
+ int p;
+ static HChar buf[32]; // for sure large enough
+@@ -521,7 +523,7 @@ fn_node* CLG_(get_fn_node)(BB* bb)
+ fnname = buf;
+ }
+ else {
+- if (VG_(get_fnname_if_entry)(bb_addr(bb), &fnname))
++ if (VG_(get_fnname_if_entry)(ep, bb_addr(bb), &fnname))
+ bb->is_entry = 1;
+ }
+
+Index: valgrind-3.13.0/coregrind/m_addrinfo.c
+===================================================================
+--- valgrind-3.13.0.orig/coregrind/m_addrinfo.c
++++ valgrind-3.13.0/coregrind/m_addrinfo.c
+@@ -86,7 +86,7 @@ static ThreadId find_tid_with_stack_cont
+ return VG_INVALID_THREADID;
+ }
+
+-void VG_(describe_addr) ( Addr a, /*OUT*/AddrInfo* ai )
++void VG_(describe_addr) ( DiEpoch ep, Addr a, /*OUT*/AddrInfo* ai )
+ {
+ VgSectKind sect;
+
+@@ -99,7 +99,7 @@ void VG_(describe_addr) ( Addr a, /*OUT*
+ VG_(free), sizeof(HChar) );
+
+ (void) VG_(get_data_description)( ai->Addr.Variable.descr1,
+- ai->Addr.Variable.descr2, a );
++ ai->Addr.Variable.descr2, ep, a );
+ /* If there's nothing in descr1/2, free them. Why is it safe to
+ VG_(indexXA) at zero here? Because VG_(get_data_description)
+ guarantees to zero terminate descr1/2 regardless of the outcome
+@@ -127,7 +127,7 @@ void VG_(describe_addr) ( Addr a, /*OUT*
+ there. -- */
+ const HChar *name;
+ if (VG_(get_datasym_and_offset)(
+- a, &name,
++ ep, a, &name,
+ &ai->Addr.DataSym.offset )) {
+ ai->Addr.DataSym.name = VG_(strdup)("mc.da.dsname", name);
+ ai->tag = Addr_DataSym;
+@@ -148,6 +148,7 @@ void VG_(describe_addr) ( Addr a, /*OUT*
+ ai->tag = Addr_Stack;
+ VG_(initThreadInfo)(&ai->Addr.Stack.tinfo);
+ ai->Addr.Stack.tinfo.tid = tid;
++ ai->Addr.Stack.epoch = ep;
+ ai->Addr.Stack.IP = 0;
+ ai->Addr.Stack.frameNo = -1;
+ ai->Addr.Stack.stackPos = StackPos_stacked;
+@@ -196,9 +197,9 @@ void VG_(describe_addr) ( Addr a, /*OUT*
+ ai->Addr.Block.block_desc = aai.name;
+ ai->Addr.Block.block_szB = aai.block_szB;
+ ai->Addr.Block.rwoffset = aai.rwoffset;
+- ai->Addr.Block.allocated_at = VG_(null_ExeContext)();
++ ai->Addr.Block.allocated_at = VG_(null_ExeContextAndEpoch)();
+ VG_(initThreadInfo) (&ai->Addr.Block.alloc_tinfo);
+- ai->Addr.Block.freed_at = VG_(null_ExeContext)();
++ ai->Addr.Block.freed_at = VG_(null_ExeContextAndEpoch)();
+ return;
+ }
+ }
+@@ -248,6 +249,7 @@ void VG_(describe_addr) ( Addr a, /*OUT*
+ ai->tag = Addr_Stack;
+ VG_(initThreadInfo)(&ai->Addr.Stack.tinfo);
+ ai->Addr.Stack.tinfo.tid = tid;
++ ai->Addr.Stack.epoch = ep;
+ ai->Addr.Stack.IP = 0;
+ ai->Addr.Stack.frameNo = -1;
+ vg_assert (stackPos != StackPos_stacked);
+@@ -447,20 +449,24 @@ static void pp_addrinfo_WRK ( Addr a, co
+ Bool haslinenum;
+ PtrdiffT offset;
+
+- if (VG_(get_inst_offset_in_function)( ai->Addr.Stack.IP,
++ if (VG_(get_inst_offset_in_function)( ai->Addr.Stack.epoch,
++ ai->Addr.Stack.IP,
+ &offset))
+- haslinenum = VG_(get_linenum) (ai->Addr.Stack.IP - offset,
++ haslinenum = VG_(get_linenum) (ai->Addr.Stack.epoch,
++ ai->Addr.Stack.IP - offset,
+ &linenum);
+ else
+ haslinenum = False;
+
+- hasfile = VG_(get_filename)(ai->Addr.Stack.IP, &file);
++ hasfile = VG_(get_filename)(ai->Addr.Stack.epoch,
++ ai->Addr.Stack.IP, &file);
+
+ HChar strlinenum[16] = ""; // large enough
+ if (hasfile && haslinenum)
+ VG_(sprintf)(strlinenum, "%u", linenum);
+
+- hasfn = VG_(get_fnname)(ai->Addr.Stack.IP, &fn);
++ hasfn = VG_(get_fnname)(ai->Addr.Stack.epoch,
++ ai->Addr.Stack.IP, &fn);
+
+ if (hasfn || hasfile)
+ VG_(emit)( "%sin frame #%d, created by %ps (%ps:%s)%s\n",
+@@ -533,32 +539,35 @@ static void pp_addrinfo_WRK ( Addr a, co
+ xpost
+ );
+ if (ai->Addr.Block.block_kind==Block_Mallocd) {
+- VG_(pp_ExeContext)(ai->Addr.Block.allocated_at);
+- vg_assert (ai->Addr.Block.freed_at == VG_(null_ExeContext)());
++ VG_(pp_ExeContextAndEpoch)(ai->Addr.Block.allocated_at);
++ vg_assert(
++ VG_(is_null_ExeContextAndEpoch)(ai->Addr.Block.freed_at));
+ }
+ else if (ai->Addr.Block.block_kind==Block_Freed) {
+- VG_(pp_ExeContext)(ai->Addr.Block.freed_at);
+- if (ai->Addr.Block.allocated_at != VG_(null_ExeContext)()) {
++ VG_(pp_ExeContextAndEpoch)(ai->Addr.Block.freed_at);
++ if (!VG_(is_null_ExeContextAndEpoch)(ai->Addr.Block.allocated_at)) {
+ VG_(emit)(
+ "%sBlock was alloc'd at%s\n",
+ xpre,
+ xpost
+ );
+- VG_(pp_ExeContext)(ai->Addr.Block.allocated_at);
++ VG_(pp_ExeContextAndEpoch)(ai->Addr.Block.allocated_at);
+ }
+ }
+ else if (ai->Addr.Block.block_kind==Block_MempoolChunk
+ || ai->Addr.Block.block_kind==Block_UserG) {
+ // client-defined
+- VG_(pp_ExeContext)(ai->Addr.Block.allocated_at);
+- vg_assert (ai->Addr.Block.freed_at == VG_(null_ExeContext)());
++ VG_(pp_ExeContextAndEpoch)(ai->Addr.Block.allocated_at);
++ vg_assert(VG_(is_null_ExeContextAndEpoch)(ai->Addr.Block.freed_at));
+ /* Nb: cannot have a freed_at, as a freed client-defined block
+ has a Block_Freed block_kind. */
+ } else {
+ // Client or Valgrind arena. At least currently, we never
+ // have stacktraces for these.
+- vg_assert (ai->Addr.Block.allocated_at == VG_(null_ExeContext)());
+- vg_assert (ai->Addr.Block.freed_at == VG_(null_ExeContext)());
++ vg_assert(VG_(is_null_ExeContextAndEpoch)
++ (ai->Addr.Block.allocated_at));
++ vg_assert(VG_(is_null_ExeContextAndEpoch)
++ (ai->Addr.Block.freed_at));
+ }
+ if (ai->Addr.Block.alloc_tinfo.tnr || ai->Addr.Block.alloc_tinfo.tid)
+ VG_(emit)(
+@@ -603,7 +612,7 @@ static void pp_addrinfo_WRK ( Addr a, co
+ if (ai->Addr.SectKind.kind == Vg_SectText) {
+ /* To better describe the address in a text segment,
+ pp a dummy stacktrace made of this single address. */
+- VG_(pp_StackTrace)( &a, 1 );
++ VG_(pp_StackTrace)( VG_(current_DiEpoch)(), &a, 1 );
+ }
+ break;
+
+Index: valgrind-3.13.0/coregrind/m_debuginfo/debuginfo.c
+===================================================================
+--- valgrind-3.13.0.orig/coregrind/m_debuginfo/debuginfo.c
++++ valgrind-3.13.0/coregrind/m_debuginfo/debuginfo.c
+@@ -70,6 +70,10 @@
+ should-we-load-debuginfo-now? finite state machine. */
+ #define DEBUG_FSM 0
+
++/* Set this to 1 to enable somewhat minimal debug printing for the
++ debuginfo-epoch machinery. */
++#define DEBUG_EPOCHS 0
++
+
+ /*------------------------------------------------------------*/
+ /*--- The _svma / _avma / _image / _bias naming scheme ---*/
+@@ -109,6 +113,116 @@ static void caches__invalidate (void);
+
+
+ /*------------------------------------------------------------*/
++/*--- Epochs ---*/
++/*------------------------------------------------------------*/
++
++/* The DebugInfo epoch is incremented every time we either load debuginfo in
++ response to an object mapping, or an existing DebugInfo becomes
++ non-current (or will be discarded) due to an object unmap. By storing,
++ in each DebugInfo, the first and last epoch for which it is valid, we can
++ unambiguously identify the set of DebugInfos which should be used to
++ provide metadata for a code or data address, provided we know the epoch
++ to which that address pertains.
++
++ Note, this isn't the same as the "handle_counter" below. That only
++ advances when new DebugInfos are created. "current_epoch" advances both
++ at DebugInfo created and destruction-or-making-non-current.
++*/
++
++// The value zero is reserved for indicating an invalid epoch number.
++static UInt current_epoch = 1;
++
++inline DiEpoch VG_(current_DiEpoch) ( void ) {
++ DiEpoch dep; dep.n = current_epoch; return dep;
++}
++
++static void advance_current_DiEpoch ( const HChar* msg ) {
++ current_epoch++;
++ if (DEBUG_EPOCHS)
++ VG_(printf)("Advancing current epoch to %u due to %s\n",
++ current_epoch, msg);
++}
++
++static inline Bool eq_DiEpoch ( DiEpoch dep1, DiEpoch dep2 ) {
++ return dep1.n == dep2.n && /*neither is invalid*/dep1.n != 0;
++}
++
++// Is this DebugInfo currently "allocated" (pre-use state, only FSM active) ?
++static inline Bool is_DebugInfo_allocated ( const DebugInfo* di )
++{
++ if (is_DiEpoch_INVALID(di->first_epoch)
++ && is_DiEpoch_INVALID(di->last_epoch)) {
++ return True;
++ } else {
++ return False;
++ }
++}
++
++// Is this DebugInfo currently "active" (valid for the current epoch) ?
++static inline Bool is_DebugInfo_active ( const DebugInfo* di )
++{
++ if (!is_DiEpoch_INVALID(di->first_epoch)
++ && is_DiEpoch_INVALID(di->last_epoch)) {
++ // Yes it is active. Sanity check ..
++ tl_assert(di->first_epoch.n <= current_epoch);
++ return True;
++ } else {
++ return False;
++ }
++}
++
++// Is this DebugInfo currently "archived" ?
++static inline Bool is_DebugInfo_archived ( const DebugInfo* di )
++{
++ if (!is_DiEpoch_INVALID(di->first_epoch)
++ && !is_DiEpoch_INVALID(di->last_epoch)) {
++ // Yes it is archived. Sanity checks ..
++ tl_assert(di->first_epoch.n <= di->last_epoch.n);
++ tl_assert(di->last_epoch.n <= current_epoch);
++ return True;
++ } else {
++ return False;
++ }
++}
++
++// Is this DebugInfo valid for the specified epoch?
++static inline Bool is_DI_valid_for_epoch ( const DebugInfo* di, DiEpoch ep )
++{
++ // Stay sane
++ vg_assert(ep.n > 0 && ep.n <= current_epoch);
++
++ Bool first_valid = !is_DiEpoch_INVALID(di->first_epoch);
++ Bool last_valid = !is_DiEpoch_INVALID(di->last_epoch);
++
++ if (first_valid) {
++ if (last_valid) {
++ // Both valid. di is in Archived state.
++ return di->first_epoch.n <= ep.n && ep.n <= di->last_epoch.n;
++ } else {
++ // First is valid, last is invalid. di is in Active state.
++ return di->first_epoch.n <= ep.n;
++ }
++ } else {
++ if (last_valid) {
++ // First is invalid, last is valid. This is an impossible state.
++ vg_assert(0);
++ /*NOTREACHED*/
++ return False;
++ } else {
++ // Neither is valid. di is in Allocated state.
++ return False;
++ }
++ }
++
++}
++
++static inline UInt ROL32 ( UInt x, UInt n )
++{
++ return (x << n) | (x >> (32-n));
++}
++
++
++/*------------------------------------------------------------*/
+ /*--- Root structure ---*/
+ /*------------------------------------------------------------*/
+
+@@ -162,6 +276,23 @@ static void move_DebugInfo_one_step_forw
+ }
+
+
++// Debugging helper for epochs
++static void show_epochs ( const HChar* msg )
++{
++ if (DEBUG_EPOCHS) {
++ DebugInfo* di;
++ VG_(printf)("\nDebugInfo epoch display, requested by \"%s\"\n", msg);
++ VG_(printf)(" Current epoch (note: 0 means \"invalid epoch\") = %u\n",
++ current_epoch);
++ for (di = debugInfo_list; di; di = di->next) {
++ VG_(printf)(" [di=%p] first %u last %u %s\n",
++ di, di->first_epoch.n, di->last_epoch.n, di->fsm.filename);
++ }
++ VG_(printf)("\n");
++ }
++}
++
++
+ /*------------------------------------------------------------*/
+ /*--- Notification (acquire/discard) helpers ---*/
+ /*------------------------------------------------------------*/
+@@ -182,6 +313,8 @@ DebugInfo* alloc_DebugInfo( const HChar*
+
+ di = ML_(dinfo_zalloc)("di.debuginfo.aDI.1", sizeof(DebugInfo));
+ di->handle = handle_counter++;
++ di->first_epoch = DiEpoch_INVALID();
++ di->last_epoch = DiEpoch_INVALID();
+ di->fsm.filename = ML_(dinfo_strdup)("di.debuginfo.aDI.2", filename);
+ di->fsm.maps = VG_(newXA)(
+ ML_(dinfo_zalloc), "di.debuginfo.aDI.3",
+@@ -302,34 +435,52 @@ static void free_DebugInfo ( DebugInfo*
+ }
+
+
+-/* 'si' is a member of debugInfo_list. Find it, remove it from the
+- list, notify m_redir that this has happened, and free all storage
+- reachable from it.
++/* 'di' is a member of debugInfo_list. Find it, and either (remove it from
++ the list and free all storage reachable from it) or archive it, notify
++ m_redir that this has happened, and free all storage reachable from it.
++
++ Note that 'di' can't be archived. Is a DebugInfo is archived then we
++ want to hold on to it forever. This is asserted for.
++
++ Note also, we don't advance the current epoch here. That's the
++ responsibility of some (non-immediate) caller.
+ */
+-static void discard_DebugInfo ( DebugInfo* di )
++static void discard_or_archive_DebugInfo ( DebugInfo* di )
+ {
+- const HChar* reason = "munmap";
++ const HChar* reason = "munmap";
++ const Bool archive = VG_(clo_keep_debuginfo);
+
+ DebugInfo** prev_next_ptr = &debugInfo_list;
+ DebugInfo* curr = debugInfo_list;
+
+ while (curr) {
+ if (curr == di) {
+- /* Found it; remove from list and free it. */
++ /* It must be active! */
++ vg_assert( is_DebugInfo_active(di));
++ /* Found it; (remove from list and free it), or archive it. */
+ if (curr->have_dinfo
+ && (VG_(clo_verbosity) > 1 || VG_(clo_trace_redir)))
+ VG_(message)(Vg_DebugMsg,
+- "Discarding syms at %#lx-%#lx in %s due to %s()\n",
++ "%s syms at %#lx-%#lx in %s due to %s()\n",
++ archive ? "Archiving" : "Discarding",
+ di->text_avma,
+ di->text_avma + di->text_size,
+ curr->fsm.filename ? curr->fsm.filename
+ : "???",
+ reason);
+ vg_assert(*prev_next_ptr == curr);
+- *prev_next_ptr = curr->next;
+- if (curr->have_dinfo)
++ if (!archive) {
++ *prev_next_ptr = curr->next;
++ }
++ if (curr->have_dinfo) {
+ VG_(redir_notify_delete_DebugInfo)( curr );
+- free_DebugInfo(curr);
++ }
++ if (archive) {
++ /* Adjust the epoch markers appropriately. */
++ di->last_epoch = VG_(current_DiEpoch)();
++ } else {
++ free_DebugInfo(curr);
++ }
+ return;
+ }
+ prev_next_ptr = &curr->next;
+@@ -358,10 +509,11 @@ static Bool discard_syms_in_range ( Addr
+ while (True) {
+ if (curr == NULL)
+ break;
+- if (curr->text_present
+- && curr->text_size > 0
+- && (start+length - 1 < curr->text_avma
+- || curr->text_avma + curr->text_size - 1 < start)) {
++ if (is_DebugInfo_archived(curr)
++ || (curr->text_present
++ && curr->text_size > 0
++ && (start+length - 1 < curr->text_avma
++ || curr->text_avma + curr->text_size - 1 < start))) {
+ /* no overlap */
+ } else {
+ found = True;
+@@ -372,7 +524,7 @@ static Bool discard_syms_in_range ( Addr
+
+ if (!found) break;
+ anyFound = True;
+- discard_DebugInfo( curr );
++ discard_or_archive_DebugInfo( curr );
+ }
+
+ return anyFound;
+@@ -418,9 +570,9 @@ static Bool do_DebugInfos_overlap ( cons
+ }
+
+
+-/* Discard all elements of debugInfo_list whose .mark bit is set.
++/* Discard or archive all elements of debugInfo_list whose .mark bit is set.
+ */
+-static void discard_marked_DebugInfos ( void )
++static void discard_or_archive_marked_DebugInfos ( void )
+ {
+ DebugInfo* curr;
+
+@@ -436,7 +588,7 @@ static void discard_marked_DebugInfos (
+ }
+
+ if (!curr) break;
+- discard_DebugInfo( curr );
++ discard_or_archive_DebugInfo( curr );
+
+ }
+ }
+@@ -446,19 +598,22 @@ static void discard_marked_DebugInfos (
+ Clearly diRef must have its mapping information set to something sane. */
+ static void discard_DebugInfos_which_overlap_with ( DebugInfo* diRef )
+ {
++ vg_assert(is_DebugInfo_allocated(diRef));
+ DebugInfo* di;
+ /* Mark all the DebugInfos in debugInfo_list that need to be
+ deleted. First, clear all the mark bits; then set them if they
+ overlap with siRef. Since siRef itself is in this list we at
+ least expect its own mark bit to be set. */
+ for (di = debugInfo_list; di; di = di->next) {
++ if (is_DebugInfo_archived(di))
++ continue;
+ di->mark = do_DebugInfos_overlap( di, diRef );
+ if (di == diRef) {
+ vg_assert(di->mark);
+ di->mark = False;
+ }
+ }
+- discard_marked_DebugInfos();
++ discard_or_archive_marked_DebugInfos();
+ }
+
+
+@@ -470,6 +625,8 @@ static DebugInfo* find_or_create_DebugIn
+ DebugInfo* di;
+ vg_assert(filename);
+ for (di = debugInfo_list; di; di = di->next) {
++ if (is_DebugInfo_archived(di))
++ continue;
+ vg_assert(di->fsm.filename);
+ if (0==VG_(strcmp)(di->fsm.filename, filename))
+ break;
+@@ -480,6 +637,7 @@ static DebugInfo* find_or_create_DebugIn
+ di->next = debugInfo_list;
+ debugInfo_list = di;
+ }
++ vg_assert(!is_DebugInfo_archived(di));
+ return di;
+ }
+
+@@ -723,6 +881,8 @@ static ULong di_notify_ACHIEVE_ACCEPT_ST
+ ULong di_handle;
+ Bool ok;
+
++ advance_current_DiEpoch("di_notify_ACHIEVE_ACCEPT_STATE");
++
+ vg_assert(di->fsm.filename);
+ TRACE_SYMTAB("\n");
+ TRACE_SYMTAB("------ start ELF OBJECT "
+@@ -734,7 +894,8 @@ static ULong di_notify_ACHIEVE_ACCEPT_ST
+ /* We're going to read symbols and debug info for the avma
+ ranges specified in the _DebugInfoFsm mapping array. First
+ get rid of any other DebugInfos which overlap any of those
+- ranges (to avoid total confusion). */
++ ranges (to avoid total confusion). But only those valid in
++ the current epoch. We don't want to discard archived DebugInfos. */
+ discard_DebugInfos_which_overlap_with( di );
+
+ /* The DebugInfoMappings that now exist in the FSM may involve
+@@ -765,6 +926,15 @@ static ULong di_notify_ACHIEVE_ACCEPT_ST
+ priv_storage.h. */
+ check_CFSI_related_invariants(di);
+ ML_(finish_CFSI_arrays)(di);
++
++ // Mark di's first epoch point as a valid epoch. Because its
++ // last_epoch value is still invalid, this changes di's state from
++ // "allocated" to "active".
++ vg_assert(is_DebugInfo_allocated(di));
++ di->first_epoch = VG_(current_DiEpoch)();
++ vg_assert(is_DebugInfo_active(di));
++ show_epochs("di_notify_ACHIEVE_ACCEPT_STATE success");
++
+ /* notify m_redir about it */
+ TRACE_SYMTAB("\n------ Notifying m_redir ------\n");
+ VG_(redir_notify_new_DebugInfo)( di );
+@@ -1077,8 +1247,11 @@ void VG_(di_notify_munmap)( Addr a, Size
+ Bool anyFound;
+ if (0) VG_(printf)("DISCARD %#lx %#lx\n", a, a+len);
+ anyFound = discard_syms_in_range(a, len);
+- if (anyFound)
++ if (anyFound) {
+ caches__invalidate();
++ advance_current_DiEpoch("VG_(di_notify_munmap)");
++ show_epochs("VG_(di_notify_munmap)");
++ }
+ }
+
+
+@@ -1094,8 +1267,10 @@ void VG_(di_notify_mprotect)( Addr a, Si
+ # endif
+ if (0 && !exe_ok) {
+ Bool anyFound = discard_syms_in_range(a, len);
+- if (anyFound)
++ if (anyFound) {
+ caches__invalidate();
++ advance_current_DiEpoch("VG_(di_notify_mprotect)");
++ }
+ }
+ }
+
+@@ -1395,6 +1570,7 @@ void VG_(di_notify_pdb_debuginfo)( Int f
+ caches__invalidate();
+ /* dump old info for this range, if any */
+ discard_syms_in_range( avma_obj, total_size );
++ advance_current_DiEpoch("VG_(di_notify_pdb_debuginfo)");
+
+ { DebugInfo* di = find_or_create_DebugInfo_for(exename);
+
+@@ -1471,6 +1647,7 @@ DebugInfoMapping* ML_(find_rx_mapping) (
+ /*------------------------------------------------------------*/
+ /*--- Types and functions for inlined IP cursor ---*/
+ /*------------------------------------------------------------*/
++
+ struct _InlIPCursor {
+ Addr eip; // Cursor used to describe calls at eip.
+ DebugInfo* di; // DebugInfo describing inlined calls at eip
+@@ -1534,8 +1711,8 @@ Bool VG_(next_IIPC)(InlIPCursor *iipc)
+ }
+
+ /* Forward */
+-static void search_all_loctabs ( Addr ptr, /*OUT*/DebugInfo** pdi,
+- /*OUT*/Word* locno );
++static void search_all_loctabs ( DiEpoch ep, Addr ptr,
++ /*OUT*/DebugInfo** pdi, /*OUT*/Word* locno );
+
+ /* Returns the position after which eip would be inserted in inltab.
+ (-1 if eip should be inserted before position 0).
+@@ -1565,7 +1742,7 @@ static Word inltab_insert_pos (DebugInfo
+ return lo - 1;
+ }
+
+-InlIPCursor* VG_(new_IIPC)(Addr eip)
++InlIPCursor* VG_(new_IIPC)(DiEpoch ep, Addr eip)
+ {
+ DebugInfo* di;
+ Word locno;
+@@ -1576,8 +1753,8 @@ InlIPCursor* VG_(new_IIPC)(Addr eip)
+ if (!VG_(clo_read_inline_info))
+ return NULL; // No way we can find inlined calls.
+
+- /* Search the DebugInfo for eip */
+- search_all_loctabs ( eip, &di, &locno );
++ /* Search the DebugInfo for (ep, eip) */
++ search_all_loctabs ( ep, eip, &di, &locno );
+ if (di == NULL || di->inltab_used == 0)
+ return NULL; // No di (with inltab) containing eip.
+
+@@ -1641,8 +1818,8 @@ void VG_(delete_IIPC)(InlIPCursor *iipc)
+ If findText==True, only text symbols are searched for.
+ If findText==False, only data symbols are searched for.
+ */
+-static void search_all_symtabs ( Addr ptr, /*OUT*/DebugInfo** pdi,
+- /*OUT*/Word* symno,
++static void search_all_symtabs ( DiEpoch ep, Addr ptr,
++ /*OUT*/DebugInfo** pdi, /*OUT*/Word* symno,
+ Bool findText )
+ {
+ Word sno;
+@@ -1651,6 +1828,9 @@ static void search_all_symtabs ( Addr pt
+
+ for (di = debugInfo_list; di != NULL; di = di->next) {
+
++ if (!is_DI_valid_for_epoch(di, ep))
++ continue;
++
+ if (findText) {
+ /* Consider any symbol in the r-x mapped area to be text.
+ See Comment_Regarding_Text_Range_Checks in storage.c for
+@@ -1698,15 +1878,17 @@ static void search_all_symtabs ( Addr pt
+ }
+
+
+-/* Search all loctabs that we know about to locate ptr. If found, set
+- *pdi to the relevant DebugInfo, and *locno to the loctab entry
++/* Search all loctabs that we know about to locate ptr at epoch ep. If
++ *found, set pdi to the relevant DebugInfo, and *locno to the loctab entry
+ *number within that. If not found, *pdi is set to NULL. */
+-static void search_all_loctabs ( Addr ptr, /*OUT*/DebugInfo** pdi,
+- /*OUT*/Word* locno )
++static void search_all_loctabs ( DiEpoch ep, Addr ptr,
++ /*OUT*/DebugInfo** pdi, /*OUT*/Word* locno )
+ {
+ Word lno;
+ DebugInfo* di;
+ for (di = debugInfo_list; di != NULL; di = di->next) {
++ if (!is_DI_valid_for_epoch(di, ep))
++ continue;
+ if (di->text_present
+ && di->text_size > 0
+ && di->text_avma <= ptr
+@@ -1729,19 +1911,22 @@ static void search_all_loctabs ( Addr pt
+
+ typedef
+ struct {
+- Addr sym_avma;
++ // (sym_epoch, sym_avma) are the hash table key.
++ DiEpoch sym_epoch;
++ Addr sym_avma;
++ // Fields below here are not part of the key.
+ const HChar* sym_name;
+ PtrdiffT offset : (sizeof(PtrdiffT)*8)-1;
+ Bool isText : 1;
+ }
+ Sym_Name_CacheEnt;
+-/* Sym_Name_CacheEnt associates a queried address to the sym name found.
+- By nature, if a sym name was found, it means the searched address
+- stored in the cache is an avma (see e.g. search_all_symtabs).
+- Note however that the caller is responsibe to work with 'avma'
+- addresses e.g. when calling VG_(get_fnname) : m_debuginfo.c has
+- no way to differentiate an 'svma a' from an 'avma a'. It is however
+- unlikely that svma would percolate outside of this module. */
++/* Sym_Name_CacheEnt associates a queried (epoch, address) pair to the sym
++ name found. By nature, if a sym name was found, it means the searched
++ address stored in the cache is an avma (see e.g. search_all_symtabs).
++ Note however that the caller is responsibe to work with 'avma' addresses
++ e.g. when calling VG_(get_fnname) : m_debuginfo.c has no way to
++ differentiate an 'svma a' from an 'avma a'. It is however unlikely that
++ svma would percolate outside of this module. */
+
+ static Sym_Name_CacheEnt sym_name_cache[N_SYM_NAME_CACHE];
+
+@@ -1757,13 +1942,15 @@ static void sym_name_cache__invalidate (
+ sym_name_cache[0].sym_name = no_sym_name;
+ }
+
+-/* The whole point of this whole big deal: map a code address to a
+- plausible symbol name. Returns False if no idea; otherwise True.
++/* The whole point of this whole big deal: map an (epoch, code address) pair
++ to a plausible symbol name. Returns False if no idea; otherwise True.
++
+ Caller supplies buf. If do_cxx_demangling is False, don't do
+ C++ demangling, regardless of VG_(clo_demangle) -- probably because the
+ call has come from VG_(get_fnname_raw)(). findText
+ indicates whether we're looking for a text symbol or a data symbol
+ -- caller must choose one kind or the other.
++
+ NOTE: See IMPORTANT COMMENT above about persistence and ownership
+ in pub_tool_debuginfo.h
+ get_sym_name and the fact it calls the demangler is the main reason
+@@ -1772,22 +1959,32 @@ static void sym_name_cache__invalidate (
+ (1) the DebugInfo it belongs to is not discarded
+ (2) the demangler is not invoked again
+ Also, the returned string is owned by "somebody else". Callers must
+- not free it or modify it.*/
++ not free it or modify it. */
+ static
+ Bool get_sym_name ( Bool do_cxx_demangling, Bool do_z_demangling,
+ Bool do_below_main_renaming,
+- Addr a, const HChar** buf,
++ DiEpoch ep, Addr a, const HChar** buf,
+ Bool match_anywhere_in_sym, Bool show_offset,
+ Bool findText, /*OUT*/PtrdiffT* offsetP )
+ {
+- UWord hash = a % N_SYM_NAME_CACHE;
+- Sym_Name_CacheEnt* se = &sym_name_cache[hash];
++ // Compute the hash from 'ep' and 'a'. The latter contains lots of
++ // significant bits, but 'ep' is expected to be a small number, typically
++ // less than 500. So rotate it around a bit in the hope of spreading the
++ // bits out somewhat.
++ vg_assert(!is_DiEpoch_INVALID(ep));
++ UWord hash = a ^ (UWord)(ep.n ^ ROL32(ep.n, 5)
++ ^ ROL32(ep.n, 13) ^ ROL32(ep.n, 19));
++ hash %= N_SYM_NAME_CACHE;
++
++ Sym_Name_CacheEnt* se = &sym_name_cache[hash];
+
+- if (UNLIKELY(se->sym_avma != a || se->isText != findText)) {
++ if (UNLIKELY(se->sym_epoch.n != ep.n || se->sym_avma != a
++ || se->isText != findText)) {
+ DebugInfo* di;
+ Word sno;
+
+- search_all_symtabs ( a, &di, &sno, findText );
++ search_all_symtabs ( ep, a, &di, &sno, findText );
++ se->sym_epoch = ep;
+ se->sym_avma = a;
+ se->isText = findText;
+ if (di == NULL || a == 0)
+@@ -1846,12 +2043,12 @@ Bool get_sym_name ( Bool do_cxx_demangli
+ /* ppc64be-linux only: find the TOC pointer (R2 value) that should be in
+ force at the entry point address of the function containing
+ guest_code_addr. Returns 0 if not known. */
+-Addr VG_(get_tocptr) ( Addr guest_code_addr )
++Addr VG_(get_tocptr) ( DiEpoch ep, Addr guest_code_addr )
+ {
+ #if defined(VGA_ppc64be) || defined(VGA_ppc64le)
+ DebugInfo* si;
+ Word sno;
+- search_all_symtabs ( guest_code_addr,
++ search_all_symtabs ( ep, guest_code_addr,
+ &si, &sno,
+ True/*consider text symbols only*/ );
+ if (si == NULL)
+@@ -1867,11 +2064,11 @@ Addr VG_(get_tocptr) ( Addr guest_code_a
+ match anywhere in function, but don't show offsets.
+ NOTE: See IMPORTANT COMMENT above about persistence and ownership
+ in pub_tool_debuginfo.h */
+-Bool VG_(get_fnname) ( Addr a, const HChar** buf )
++Bool VG_(get_fnname) ( DiEpoch ep, Addr a, const HChar** buf )
+ {
+ return get_sym_name ( /*C++-demangle*/True, /*Z-demangle*/True,
+ /*below-main-renaming*/True,
+- a, buf,
++ ep, a, buf,
+ /*match_anywhere_in_fun*/True,
+ /*show offset?*/False,
+ /*text sym*/True,
+@@ -1882,11 +2079,11 @@ Bool VG_(get_fnname) ( Addr a, const HCh
+ match anywhere in function, and show offset if nonzero.
+ NOTE: See IMPORTANT COMMENT above about persistence and ownership
+ in pub_tool_debuginfo.h */
+-Bool VG_(get_fnname_w_offset) ( Addr a, const HChar** buf )
++Bool VG_(get_fnname_w_offset) ( DiEpoch ep, Addr a, const HChar** buf )
+ {
+ return get_sym_name ( /*C++-demangle*/True, /*Z-demangle*/True,
+ /*below-main-renaming*/True,
+- a, buf,
++ ep, a, buf,
+ /*match_anywhere_in_fun*/True,
+ /*show offset?*/True,
+ /*text sym*/True,
+@@ -1898,14 +2095,14 @@ Bool VG_(get_fnname_w_offset) ( Addr a,
+ and don't show offsets.
+ NOTE: See IMPORTANT COMMENT above about persistence and ownership
+ in pub_tool_debuginfo.h */
+-Bool VG_(get_fnname_if_entry) ( Addr a, const HChar** buf )
++Bool VG_(get_fnname_if_entry) ( DiEpoch ep, Addr a, const HChar** buf )
+ {
+ const HChar *tmp;
+ Bool res;
+
+ res = get_sym_name ( /*C++-demangle*/True, /*Z-demangle*/True,
+ /*below-main-renaming*/True,
+- a, &tmp,
++ ep, a, &tmp,
+ /*match_anywhere_in_fun*/False,
+ /*show offset?*/False,
+ /*text sym*/True,
+@@ -1920,11 +2117,11 @@ Bool VG_(get_fnname_if_entry) ( Addr a,
+ offsets.
+ NOTE: See IMPORTANT COMMENT above about persistence and ownership
+ in pub_tool_debuginfo.h */
+-Bool VG_(get_fnname_raw) ( Addr a, const HChar** buf )
++Bool VG_(get_fnname_raw) ( DiEpoch ep, Addr a, const HChar** buf )
+ {
+ return get_sym_name ( /*C++-demangle*/False, /*Z-demangle*/False,
+ /*below-main-renaming*/False,
+- a, buf,
++ ep, a, buf,
+ /*match_anywhere_in_fun*/True,
+ /*show offset?*/False,
+ /*text sym*/True,
+@@ -1936,14 +2133,22 @@ Bool VG_(get_fnname_raw) ( Addr a, const
+ don't show offsets.
+ NOTE: See IMPORTANT COMMENT above about persistence and ownership
+ in pub_tool_debuginfo.h */
+-Bool VG_(get_fnname_no_cxx_demangle) ( Addr a, const HChar** buf,
++Bool VG_(get_fnname_no_cxx_demangle) ( DiEpoch ep, Addr a, const HChar** buf,
+ const InlIPCursor* iipc )
+ {
++ // FIXME JRS 28 June 2017: should we use 'iipc->di->first_epoch'
++ // instead of 'ep' in the call to get_sym_name? At least let's
++ // assert that the DebugInfo that 'iipc' mentions is valid for the
++ // specified epoch.
++ if (iipc) {
++ vg_assert(is_DI_valid_for_epoch(iipc->di, ep));
++ }
++
+ if (is_bottom(iipc)) {
+ // At the bottom (towards main), we describe the fn at eip.
+ return get_sym_name ( /*C++-demangle*/False, /*Z-demangle*/True,
+ /*below-main-renaming*/True,
+- a, buf,
++ ep, a, buf,
+ /*match_anywhere_in_fun*/True,
+ /*show offset?*/False,
+ /*text sym*/True,
+@@ -1962,13 +2167,13 @@ Bool VG_(get_fnname_no_cxx_demangle) ( A
+ /* mips-linux only: find the offset of current address. This is needed for
+ stack unwinding for MIPS.
+ */
+-Bool VG_(get_inst_offset_in_function)( Addr a,
++Bool VG_(get_inst_offset_in_function)( DiEpoch ep, Addr a,
+ /*OUT*/PtrdiffT* offset )
+ {
+ const HChar *fnname;
+ return get_sym_name ( /*C++-demangle*/False, /*Z-demangle*/False,
+ /*below-main-renaming*/False,
+- a, &fnname,
++ ep, a, &fnname,
+ /*match_anywhere_in_sym*/True,
+ /*show offset?*/False,
+ /*text sym*/True,
+@@ -2000,13 +2205,13 @@ Vg_FnNameKind VG_(get_fnname_kind) ( con
+ }
+ }
+
+-Vg_FnNameKind VG_(get_fnname_kind_from_IP) ( Addr ip )
++Vg_FnNameKind VG_(get_fnname_kind_from_IP) ( DiEpoch ep, Addr ip )
+ {
+ const HChar *buf;
+
+ // We don't demangle, because it's faster not to, and the special names
+ // we're looking for won't be mangled.
+- if (VG_(get_fnname_raw) ( ip, &buf )) {
++ if (VG_(get_fnname_raw) ( ep, ip, &buf )) {
+
+ return VG_(get_fnname_kind)(buf);
+ } else {
+@@ -2019,13 +2224,13 @@ Vg_FnNameKind VG_(get_fnname_kind_from_I
+ Also data_addr's offset from the symbol start is put into *offset.
+ NOTE: See IMPORTANT COMMENT above about persistence and ownership
+ in pub_tool_debuginfo.h */
+-Bool VG_(get_datasym_and_offset)( Addr data_addr,
++Bool VG_(get_datasym_and_offset)( DiEpoch ep, Addr data_addr,
+ /*OUT*/const HChar** dname,
+ /*OUT*/PtrdiffT* offset )
+ {
+ return get_sym_name ( /*C++-demangle*/False, /*Z-demangle*/False,
+ /*below-main-renaming*/False,
+- data_addr, dname,
++ ep, data_addr, dname,
+ /*match_anywhere_in_sym*/True,
+ /*show offset?*/False,
+ /*text sym*/False,
+@@ -2038,7 +2243,7 @@ Bool VG_(get_datasym_and_offset)( Addr d
+ (1) the DebugInfo it belongs to is not discarded
+ (2) the segment containing the address is not merged with another segment
+ */
+-Bool VG_(get_objname) ( Addr a, const HChar** objname )
++Bool VG_(get_objname) ( DiEpoch ep, Addr a, const HChar** objname )
+ {
+ DebugInfo* di;
+ const NSegment *seg;
+@@ -2047,6 +2252,8 @@ Bool VG_(get_objname) ( Addr a, const HC
+ /* Look in the debugInfo_list to find the name. In most cases we
+ expect this to produce a result. */
+ for (di = debugInfo_list; di != NULL; di = di->next) {
++ if (!is_DI_valid_for_epoch(di, ep))
++ continue;
+ if (di->text_present
+ && di->text_size > 0
+ && di->text_avma <= a
+@@ -2059,8 +2266,13 @@ Bool VG_(get_objname) ( Addr a, const HC
+ the debugInfo_list, ask the address space manager whether it
+ knows the name of the file associated with this mapping. This
+ allows us to print the names of exe/dll files in the stack trace
+- when running programs under wine. */
+- if ( (seg = VG_(am_find_nsegment)(a)) != NULL
++ when running programs under wine.
++
++ Restrict this to the case where 'ep' is the current epoch, though, so
++ that we don't return information about this epoch when the caller was
++ enquiring about a different one. */
++ if ( eq_DiEpoch(ep, VG_(current_DiEpoch)())
++ && (seg = VG_(am_find_nsegment)(a)) != NULL
+ && (filename = VG_(am_get_filename)(seg)) != NULL ) {
+ *objname = filename;
+ return True;
+@@ -2070,12 +2282,14 @@ Bool VG_(get_objname) ( Addr a, const HC
+
+ /* Map a code address to its DebugInfo. Returns NULL if not found. Doesn't
+ require debug info. */
+-DebugInfo* VG_(find_DebugInfo) ( Addr a )
++DebugInfo* VG_(find_DebugInfo) ( DiEpoch ep, Addr a )
+ {
+ static UWord n_search = 0;
+ DebugInfo* di;
+ n_search++;
+ for (di = debugInfo_list; di != NULL; di = di->next) {
++ if (!is_DI_valid_for_epoch(di, ep))
++ continue;
+ if (di->text_present
+ && di->text_size > 0
+ && di->text_avma <= a
+@@ -2091,13 +2305,13 @@ DebugInfo* VG_(find_DebugInfo) ( Addr a
+ /* Map a code address to a filename. Returns True if successful. The
+ returned string is persistent as long as the DebugInfo to which it
+ belongs is not discarded. */
+-Bool VG_(get_filename)( Addr a, const HChar** filename )
++Bool VG_(get_filename)( DiEpoch ep, Addr a, const HChar** filename )
+ {
+ DebugInfo* si;
+ Word locno;
+ UInt fndn_ix;
+
+- search_all_loctabs ( a, &si, &locno );
++ search_all_loctabs ( ep, a, &si, &locno );
+ if (si == NULL)
+ return False;
+ fndn_ix = ML_(fndn_ix) (si, locno);
+@@ -2106,11 +2320,11 @@ Bool VG_(get_filename)( Addr a, const HC
+ }
+
+ /* Map a code address to a line number. Returns True if successful. */
+-Bool VG_(get_linenum)( Addr a, UInt* lineno )
++Bool VG_(get_linenum)( DiEpoch ep, Addr a, UInt* lineno )
+ {
+ DebugInfo* si;
+ Word locno;
+- search_all_loctabs ( a, &si, &locno );
++ search_all_loctabs ( ep, a, &si, &locno );
+ if (si == NULL)
+ return False;
+ *lineno = si->loctab[locno].lineno;
+@@ -2121,7 +2335,7 @@ Bool VG_(get_linenum)( Addr a, UInt* lin
+ /* Map a code address to a filename/line number/dir name info.
+ See prototype for detailed description of behaviour.
+ */
+-Bool VG_(get_filename_linenum) ( Addr a,
++Bool VG_(get_filename_linenum) ( DiEpoch ep, Addr a,
+ /*OUT*/const HChar** filename,
+ /*OUT*/const HChar** dirname,
+ /*OUT*/UInt* lineno )
+@@ -2130,7 +2344,7 @@ Bool VG_(get_filename_linenum) ( Addr a,
+ Word locno;
+ UInt fndn_ix;
+
+- search_all_loctabs ( a, &si, &locno );
++ search_all_loctabs ( ep, a, &si, &locno );
+ if (si == NULL) {
+ if (dirname) {
+ *dirname = "";
+@@ -2159,7 +2373,8 @@ Bool VG_(get_filename_linenum) ( Addr a,
+ Therefore specify "*" to search all the objects. On TOC-afflicted
+ platforms, a symbol is deemed to be found only if it has a nonzero
+ TOC pointer. */
+-Bool VG_(lookup_symbol_SLOW)(const HChar* sopatt, const HChar* name,
++Bool VG_(lookup_symbol_SLOW)(DiEpoch ep,
++ const HChar* sopatt, const HChar* name,
+ SymAVMAs* avmas)
+ {
+ Bool require_pToc = False;
+@@ -2172,6 +2387,8 @@ Bool VG_(lookup_symbol_SLOW)(const HChar
+ for (si = debugInfo_list; si; si = si->next) {
+ if (debug)
+ VG_(printf)("lookup_symbol_SLOW: considering %s\n", si->soname);
++ if (!is_DI_valid_for_epoch(si, ep))
++ continue;
+ if (!VG_(string_match)(sopatt, si->soname)) {
+ if (debug)
+ VG_(printf)(" ... skip\n");
+@@ -2254,7 +2471,7 @@ putStrEsc( SizeT n, HChar** buf, SizeT *
+ return n;
+ }
+
+-const HChar* VG_(describe_IP)(Addr eip, const InlIPCursor *iipc)
++const HChar* VG_(describe_IP)(DiEpoch ep, Addr eip, const InlIPCursor *iipc)
+ {
+ static HChar *buf = NULL;
+ static SizeT bufsiz = 0;
+@@ -2267,7 +2484,10 @@ const HChar* VG_(describe_IP)(Addr eip,
+ HChar ibuf[50]; // large enough
+ SizeT n = 0;
+
+- vg_assert (!iipc || iipc->eip == eip);
++ // An InlIPCursor is associated with one specific DebugInfo. So if
++ // it exists, make sure that it is valid for the specified DiEpoch.
++ vg_assert (!iipc
++ || (is_DI_valid_for_epoch(iipc->di, ep) && iipc->eip == eip));
+
+ const HChar *buf_fn;
+ const HChar *buf_obj;
+@@ -2282,8 +2502,8 @@ const HChar* VG_(describe_IP)(Addr eip,
+ if (is_bottom(iipc)) {
+ // At the bottom (towards main), we describe the fn at eip.
+ know_fnname = VG_(clo_sym_offsets)
+- ? VG_(get_fnname_w_offset) (eip, &buf_fn)
+- : VG_(get_fnname) (eip, &buf_fn);
++ ? VG_(get_fnname_w_offset) (ep, eip, &buf_fn)
++ : VG_(get_fnname) (ep, eip, &buf_fn);
+ } else {
+ const DiInlLoc *next_inl = iipc && iipc->next_inltab >= 0
+ ? & iipc->di->inltab[iipc->next_inltab]
+@@ -2301,12 +2521,12 @@ const HChar* VG_(describe_IP)(Addr eip,
+ // ??? Currently never showing an offset.
+ }
+
+- know_objname = VG_(get_objname)(eip, &buf_obj);
++ know_objname = VG_(get_objname)(ep, eip, &buf_obj);
+
+ if (is_top(iipc)) {
+ // The source for the highest level is in the loctab entry.
+ know_srcloc = VG_(get_filename_linenum)(
+- eip,
++ ep, eip,
+ &buf_srcloc,
+ &buf_dirname,
+ &lineno
+@@ -2459,6 +2679,20 @@ const HChar* VG_(describe_IP)(Addr eip,
+ /*--- ---*/
+ /*--------------------------------------------------------------*/
+
++/* Note that the CFI machinery pertains to unwinding the stack "right now".
++ There is no support for unwinding stack images obtained from some time in
++ the past. That means that:
++
++ (1) We only deal with CFI from DebugInfos that are valid for the current
++ debuginfo epoch. Unlike in the rest of the file, there is no
++ epoch-awareness.
++
++ (2) We assume that the CFI cache will be invalidated every time the the
++ epoch changes. This is done by ensuring (in the file above) that
++ every call to advance_current_DiEpoch has a call to
++ caches__invalidate alongside it.
++*/
++
+ /* Gather up all the constant pieces of info needed to evaluate
+ a CfiExpr into one convenient struct. */
+ typedef
+@@ -2579,6 +2813,9 @@ UWord evalCfiExpr ( const XArray* exprs,
+ *cfsi_mP to the cfsi_m pointer in that DebugInfo's cfsi_m_pool.
+
+ If not found, set *diP to (DebugInfo*)1 and *cfsi_mP to zero.
++
++ Per comments at the top of this section, we only look for CFI in
++ DebugInfos that are valid for the current epoch.
+ */
+ __attribute__((noinline))
+ static void find_DiCfSI ( /*OUT*/DebugInfo** diP,
+@@ -2594,10 +2831,15 @@ static void find_DiCfSI ( /*OUT*/DebugIn
+
+ if (0) VG_(printf)("search for %#lx\n", ip);
+
++ DiEpoch curr_epoch = VG_(current_DiEpoch)();
++
+ for (di = debugInfo_list; di != NULL; di = di->next) {
+ Word j;
+ n_steps++;
+
++ if (!is_DI_valid_for_epoch(di, curr_epoch))
++ continue;
++
+ /* Use the per-DebugInfo summary address ranges to skip
+ inapplicable DebugInfos quickly. */
+ if (di->cfsi_used == 0)
+@@ -2605,6 +2847,11 @@ static void find_DiCfSI ( /*OUT*/DebugIn
+ if (ip < di->cfsi_minavma || ip > di->cfsi_maxavma)
+ continue;
+
++ // This di must be active (because we have explicitly chosen not to
++ // allow unwinding stacks that pertain to some past epoch). It can't
++ // be archived or not-yet-active.
++ vg_assert(is_DebugInfo_active(di));
++
+ /* It might be in this DebugInfo. Search it. */
+ j = ML_(search_one_cfitab)( di, ip );
+ vg_assert(j >= -1 && j < (Word)di->cfsi_used);
+@@ -3032,6 +3279,7 @@ Bool VG_(use_CF_info) ( /*MOD*/D3UnwindR
+ Bool VG_(use_FPO_info) ( /*MOD*/Addr* ipP,
+ /*MOD*/Addr* spP,
+ /*MOD*/Addr* fpP,
++ DiEpoch ep,
+ Addr min_accessible,
+ Addr max_accessible )
+ {
+@@ -3049,6 +3297,9 @@ Bool VG_(use_FPO_info) ( /*MOD*/Addr* ip
+ for (di = debugInfo_list; di != NULL; di = di->next) {
+ n_steps++;
+
++ if (!is_DI_valid_for_epoch(di, ep))
++ continue;
++
+ /* Use the per-DebugInfo summary address ranges to skip
+ inapplicable DebugInfos quickly. */
+ if (di->fpo == NULL)
+@@ -3552,6 +3803,7 @@ static void format_message ( /*MOD*/XArr
+ static
+ Bool consider_vars_in_frame ( /*MOD*/XArray* /* of HChar */ dname1,
+ /*MOD*/XArray* /* of HChar */ dname2,
++ DiEpoch ep,
+ Addr data_addr,
+ Addr ip, Addr sp, Addr fp,
+ /* shown to user: */
+@@ -3570,6 +3822,8 @@ Bool consider_vars_in_frame ( /*MOD*/XAr
+ /* first, find the DebugInfo that pertains to 'ip'. */
+ for (di = debugInfo_list; di; di = di->next) {
+ n_steps++;
++ if (!is_DI_valid_for_epoch(di, ep))
++ continue;
+ /* text segment missing? unlikely, but handle it .. */
+ if (!di->text_present || di->text_size == 0)
+ continue;
+@@ -3687,7 +3941,7 @@ Bool consider_vars_in_frame ( /*MOD*/XAr
+ Bool VG_(get_data_description)(
+ /*MOD*/ XArray* /* of HChar */ dname1,
+ /*MOD*/ XArray* /* of HChar */ dname2,
+- Addr data_addr
++ DiEpoch ep, Addr data_addr
+ )
+ {
+ # define N_FRAMES 8
+@@ -3807,7 +4061,7 @@ Bool VG_(get_data_description)(
+ vg_assert(n_frames >= 0 && n_frames <= N_FRAMES);
+ for (j = 0; j < n_frames; j++) {
+ if (consider_vars_in_frame( dname1, dname2,
+- data_addr,
++ ep, data_addr,
+ ips[j],
+ sps[j], fps[j], tid, j )) {
+ zterm_XA( dname1 );
+@@ -3834,7 +4088,7 @@ Bool VG_(get_data_description)(
+ equivalent kludge. */
+ if (j > 0 /* this is a non-innermost frame */
+ && consider_vars_in_frame( dname1, dname2,
+- data_addr,
++ ep, data_addr,
+ ips[j] + 1,
+ sps[j], fps[j], tid, j )) {
+ zterm_XA( dname1 );
+Index: valgrind-3.13.0/coregrind/m_debuginfo/priv_storage.h
+===================================================================
+--- valgrind-3.13.0.orig/coregrind/m_debuginfo/priv_storage.h
++++ valgrind-3.13.0/coregrind/m_debuginfo/priv_storage.h
+@@ -588,6 +588,36 @@ struct _DebugInfo {
+ structure is allocated. */
+ ULong handle;
+
++ /* The range of epochs for which this DebugInfo is valid. These also
++ divide the DebugInfo's lifetime into three parts:
++
++ (1) Allocated: but with only .fsm holding useful info -- in
++ particular, not yet holding any debug info.
++ .first_epoch == DebugInfoEpoch_INVALID
++ .last_epoch == DebugInfoEpoch_INVALID
++
++ (2) Active: containing debug info, and current.
++ .first_epoch != DebugInfoEpoch_INVALID
++ .last_epoch == DebugInfoEpoch_INVALID
++
++ (3) Archived: containing debug info, but no longer current.
++ .first_epoch != DebugInfoEpoch_INVALID
++ .last_epoch != DebugInfoEpoch_INVALID
++
++ State (2) corresponds to an object which is currently mapped. When
++ the object is unmapped, what happens depends on the setting of
++ --keep-debuginfo:
++
++ * when =no, the DebugInfo is removed from debugInfo_list and
++ deleted.
++
++ * when =yes, the DebugInfo is retained in debugInfo_list, but its
++ .last_epoch field is filled in, and current_epoch is advanced. This
++ effectively moves the DebugInfo into state (3).
++ */
++ DiEpoch first_epoch;
++ DiEpoch last_epoch;
++
+ /* Used for debugging only - indicate what stuff to dump whilst
+ reading stuff into the seginfo. Are computed as early in the
+ lifetime of the DebugInfo as possible -- at the point when it is
+Index: valgrind-3.13.0/coregrind/m_errormgr.c
+===================================================================
+--- valgrind-3.13.0.orig/coregrind/m_errormgr.c
++++ valgrind-3.13.0/coregrind/m_errormgr.c
+@@ -136,16 +136,16 @@ struct _Error {
+ Int count;
+
+ // The tool-specific part
+- ThreadId tid; // Initialised by core
+- ExeContext* where; // Initialised by core
+- ErrorKind ekind; // Used by ALL. Must be in the range (0..)
+- Addr addr; // Used frequently
+- const HChar* string; // Used frequently
+- void* extra; // For any tool-specific extras
++ ThreadId tid; // Initialised by core
++ ExeContextAndEpoch where; // Initialised by core
++ ErrorKind ekind; // Used by ALL. Must be in the range (0..)
++ Addr addr; // Used frequently
++ const HChar* string; // Used frequently
++ void* extra; // For any tool-specific extras
+ };
+
+
+-ExeContext* VG_(get_error_where) ( const Error* err )
++ExeContextAndEpoch VG_(get_error_where) ( const Error* err )
+ {
+ return err->where;
+ }
+@@ -293,7 +293,10 @@ static Bool eq_Error ( VgRes res, const
+ {
+ if (e1->ekind != e2->ekind)
+ return False;
+- if (!VG_(eq_ExeContext)(res, e1->where, e2->where))
++ // This comparison ignores the debuginfo epoch. Result is that we
++ // could conclude this error is the same as one from some other epoch.
++ // I don't think that's a big deal in practice.
++ if (!VG_(eq_ExeContext)(res, e1->where.ec, e2->where.ec))
+ return False;
+
+ switch (e1->ekind) {
+@@ -321,15 +324,15 @@ static Bool eq_Error ( VgRes res, const
+ */
+ #define ERRTXT_LEN 4096
+
+-static void printSuppForIp_XML(UInt n, Addr ip, void* uu_opaque)
++static void printSuppForIp_XML(UInt n, DiEpoch ep, Addr ip, void* uu_opaque)
+ {
+ const HChar *buf;
+- InlIPCursor* iipc = VG_(new_IIPC)(ip);
++ InlIPCursor* iipc = VG_(new_IIPC)(ep, ip);
+ do {
+- if ( VG_(get_fnname_no_cxx_demangle) (ip, &buf, iipc) ) {
++ if ( VG_(get_fnname_no_cxx_demangle) (ep, ip, &buf, iipc) ) {
+ VG_(printf_xml)(" <sframe> <fun>%pS</fun> </sframe>\n", buf);
+ } else
+- if ( VG_(get_objname)(ip, &buf) ) {
++ if ( VG_(get_objname)(ep, ip, &buf) ) {
+ VG_(printf_xml)(" <sframe> <obj>%pS</obj> </sframe>\n", buf);
+ } else {
+ VG_(printf_xml)(" <sframe> <obj>*</obj> </sframe>\n");
+@@ -338,16 +341,16 @@ static void printSuppForIp_XML(UInt n, A
+ VG_(delete_IIPC)(iipc);
+ }
+
+-static void printSuppForIp_nonXML(UInt n, Addr ip, void* textV)
++static void printSuppForIp_nonXML(UInt n, DiEpoch ep, Addr ip, void* textV)
+ {
+ const HChar *buf;
+ XArray* /* of HChar */ text = (XArray*)textV;
+- InlIPCursor* iipc = VG_(new_IIPC)(ip);
++ InlIPCursor* iipc = VG_(new_IIPC)(ep, ip);
+ do {
+- if ( VG_(get_fnname_no_cxx_demangle) (ip, &buf, iipc) ) {
++ if ( VG_(get_fnname_no_cxx_demangle) (ep, ip, &buf, iipc) ) {
+ VG_(xaprintf)(text, " fun:%s\n", buf);
+ } else
+- if ( VG_(get_objname)(ip, &buf) ) {
++ if ( VG_(get_objname)(ep, ip, &buf) ) {
+ VG_(xaprintf)(text, " obj:%s\n", buf);
+ } else {
+ VG_(xaprintf)(text, " obj:*\n");
+@@ -361,15 +364,15 @@ static void printSuppForIp_nonXML(UInt n
+ static void gen_suppression(const Error* err)
+ {
+ const HChar* name;
+- ExeContext* ec;
++ ExeContextAndEpoch ece;
+ XArray* /* HChar */ text;
+
+ const HChar* dummy_name = "insert_a_suppression_name_here";
+
+ vg_assert(err);
+
+- ec = VG_(get_error_where)(err);
+- vg_assert(ec);
++ ece = VG_(get_error_where)(err);
++ vg_assert(ece.ec);
+
+ name = VG_TDICT_CALL(tool_get_error_name, err);
+ if (NULL == name) {
+@@ -408,12 +411,12 @@ static void gen_suppression(const Error*
+ VG_(xaprintf)(text, " %s\n", xtra);
+
+ // Print stack trace elements
+- UInt n_ips = VG_(get_ExeContext_n_ips)(ec);
++ UInt n_ips = VG_(get_ExeContext_n_ips)(ece.ec);
+ vg_assert(n_ips > 0);
+ vg_assert(n_ips <= VG_DEEPEST_BACKTRACE);
+ VG_(apply_StackTrace)(printSuppForIp_nonXML,
+- text,
+- VG_(get_ExeContext_StackTrace)(ec),
++ text, ece.epoch,
++ VG_(get_ExeContext_StackTrace)(ece.ec),
+ n_ips);
+
+ VG_(xaprintf)(text, "}\n");
+@@ -441,9 +444,9 @@ static void gen_suppression(const Error*
+
+ // Print stack trace elements
+ VG_(apply_StackTrace)(printSuppForIp_XML,
+- NULL,
+- VG_(get_ExeContext_StackTrace)(ec),
+- VG_(get_ExeContext_n_ips)(ec));
++ NULL, ece.epoch,
++ VG_(get_ExeContext_StackTrace)(ece.ec),
++ VG_(get_ExeContext_n_ips)(ece.ec));
+
+ // And now the cdata bit
+ // XXX FIXME! properly handle the case where the raw text
+@@ -637,7 +640,7 @@ static void pp_Error ( const Error* err,
+ /* Construct an error */
+ static
+ void construct_error ( Error* err, ThreadId tid, ErrorKind ekind, Addr a,
+- const HChar* s, void* extra, ExeContext* where )
++ const HChar* s, void* extra, ExeContextAndEpoch where )
+ {
+ /* DO NOT MAKE unique_counter NON-STATIC */
+ static UInt unique_counter = 0;
+@@ -650,10 +653,7 @@ void construct_error ( Error* err, Threa
+ err->supp = NULL;
+ err->count = 1;
+ err->tid = tid;
+- if (NULL == where)
+- err->where = VG_(record_ExeContext)( tid, 0 );
+- else
+- err->where = where;
++ err->where = where;
+
+ /* Tool-relevant parts */
+ err->ekind = ekind;
+@@ -744,7 +744,10 @@ void VG_(maybe_record_error) ( ThreadId
+ }
+
+ /* Build ourselves the error */
+- construct_error ( &err, tid, ekind, a, s, extra, NULL );
++ { ExeContextAndEpoch ece
++ = VG_(tag_EC_with_current_epoch)( VG_(record_ExeContext)( tid, 0 ) );
++ construct_error ( &err, tid, ekind, a, s, extra, ece );
++ }
+
+ /* First, see if we've got an error record matching this one. */
+ em_errlist_searches++;
+@@ -853,7 +856,8 @@ void VG_(maybe_record_error) ( ThreadId
+ Bool 'count_error' dictates whether to count the error in n_errs_found.
+ */
+ Bool VG_(unique_error) ( ThreadId tid, ErrorKind ekind, Addr a, const HChar* s,
+- void* extra, ExeContext* where, Bool print_error,
++ void* extra, ExeContextAndEpoch where,
++ Bool print_error,
+ Bool allow_db_attach, Bool count_error )
+ {
+ Error err;
+@@ -1016,7 +1020,7 @@ void VG_(show_all_errors) ( Int verbosi
+ vg_assert(! xml);
+
+ if ((i+1 == VG_(clo_dump_error))) {
+- StackTrace ips = VG_(get_ExeContext_StackTrace)(p_min->where);
++ StackTrace ips = VG_(get_ExeContext_StackTrace)(p_min->where.ec);
+ VG_(translate) ( 0 /* dummy ThreadId; irrelevant due to debugging*/,
+ ips[0], /*debugging*/True, 0xFE/*verbosity*/,
+ /*bbs_done*/0,
+@@ -1500,6 +1504,7 @@ static Bool supploc_IsQuery ( const void
+ allocations and the nr of debuginfo search. */
+ typedef
+ struct {
++ DiEpoch epoch; // used to interpret .ips
+ StackTrace ips; // stack trace we are lazily completing.
+ UWord n_ips; // nr of elements in ips.
+
+@@ -1595,9 +1600,11 @@ static void clearIPtoFunOrObjCompleter (
+ su->sname,
+ filename,
+ su->sname_lineno);
+- } else
++ } else {
+ VG_(dmsg)("errormgr matching end no suppression matched:\n");
+- VG_(pp_StackTrace) (ip2fo->ips, ip2fo->n_ips);
++ }
++ // JRS 27 July 2017: is it OK to use the current epoch here?
++ VG_(pp_StackTrace) (ip2fo->epoch, ip2fo->ips, ip2fo->n_ips);
+ pp_ip2fo(ip2fo);
+ }
+ if (ip2fo->n_offsets_per_ip) VG_(free)(ip2fo->n_offsets_per_ip);
+@@ -1660,7 +1667,8 @@ static HChar* foComplete(IPtoFunOrObjCom
+ // up comparing "malloc" in the suppression against
+ // "_vgrZU_libcZdsoZa_malloc" in the backtrace, and the
+ // two of them need to be made to match.
+- if (!VG_(get_fnname_no_cxx_demangle)(ip2fo->ips[ixInput],
++ if (!VG_(get_fnname_no_cxx_demangle)(ip2fo->epoch,
++ ip2fo->ips[ixInput],
+ &caller,
+ NULL))
+ caller = "???";
+@@ -1681,7 +1689,7 @@ static HChar* foComplete(IPtoFunOrObjCom
+ last_expand_pos_ips is the last offset in fun/obj where
+ ips[pos_ips] has been expanded. */
+
+- if (!VG_(get_objname)(ip2fo->ips[pos_ips], &caller))
++ if (!VG_(get_objname)(ip2fo->epoch, ip2fo->ips[pos_ips], &caller))
+ caller = "???";
+
+ // Have all inlined calls pointing at this object name
+@@ -1751,7 +1759,7 @@ static void expandInput (IPtoFunOrObjCom
+ const Addr IP = ip2fo->ips[ip2fo->n_ips_expanded];
+ InlIPCursor *iipc;
+
+- iipc = VG_(new_IIPC)(IP);
++ iipc = VG_(new_IIPC)(ip2fo->epoch, IP);
+ // The only thing we really need is the nr of inlined fn calls
+ // corresponding to the IP we will expand.
+ // However, computing this is mostly the same as finding
+@@ -1760,7 +1768,7 @@ static void expandInput (IPtoFunOrObjCom
+ const HChar *caller;
+ grow_offsets(ip2fo, ip2fo->n_expanded+1);
+ ip2fo->fun_offsets[ip2fo->n_expanded] = ip2fo->names_free;
+- if (!VG_(get_fnname_no_cxx_demangle)(IP,
++ if (!VG_(get_fnname_no_cxx_demangle)(ip2fo->epoch, IP,
+ &caller,
+ iipc))
+ caller = "???";
+@@ -1788,18 +1796,18 @@ static void expandInput (IPtoFunOrObjCom
+ }
+ }
+
+-static Bool haveInputInpC (void* inputCompleter, UWord ixInput )
++static Bool haveInputInpC (void* inputCompleterV, UWord ixInput )
+ {
+- IPtoFunOrObjCompleter* ip2fo = inputCompleter;
++ IPtoFunOrObjCompleter* ip2fo = (IPtoFunOrObjCompleter*)inputCompleterV;
+ expandInput(ip2fo, ixInput);
+ return ixInput < ip2fo->n_expanded;
+ }
+
+ static Bool supp_pattEQinp ( const void* supplocV, const void* addrV,
+- void* inputCompleter, UWord ixInput )
++ void* inputCompleterV, UWord ixInput )
+ {
+- const SuppLoc* supploc = supplocV; /* PATTERN */
+- IPtoFunOrObjCompleter* ip2fo = inputCompleter;
++ const SuppLoc* supploc = (const SuppLoc*)supplocV; /* PATTERN */
++ IPtoFunOrObjCompleter* ip2fo = (IPtoFunOrObjCompleter*)inputCompleterV;
+ HChar* funobj_name; // Fun or Obj name.
+ Bool ret;
+
+@@ -1926,8 +1934,9 @@ static Supp* is_suppressible_error ( con
+ em_supplist_searches++;
+
+ /* Prepare the lazy input completer. */
+- ip2fo.ips = VG_(get_ExeContext_StackTrace)(err->where);
+- ip2fo.n_ips = VG_(get_ExeContext_n_ips)(err->where);
++ ip2fo.epoch = err->where.epoch;
++ ip2fo.ips = VG_(get_ExeContext_StackTrace)(err->where.ec);
++ ip2fo.n_ips = VG_(get_ExeContext_n_ips)(err->where.ec);
+ ip2fo.n_ips_expanded = 0;
+ ip2fo.n_expanded = 0;
+ ip2fo.sz_offsets = 0;
+Index: valgrind-3.13.0/coregrind/m_execontext.c
+===================================================================
+--- valgrind-3.13.0.orig/coregrind/m_execontext.c
++++ valgrind-3.13.0/coregrind/m_execontext.c
+@@ -116,7 +116,7 @@ static ULong ec_cmpAlls;
+
+
+ /*------------------------------------------------------------*/
+-/*--- Exported functions. ---*/
++/*--- ExeContext functions. ---*/
+ /*------------------------------------------------------------*/
+
+ static ExeContext* record_ExeContext_wrk2 ( const Addr* ips, UInt n_ips );
+@@ -169,7 +169,9 @@ void VG_(print_ExeContext_stats) ( Bool
+ for (ec = ec_htab[i]; ec; ec = ec->chain) {
+ VG_(message)(Vg_DebugMsg, " exectx: stacktrace ecu %u n_ips %u\n",
+ ec->ecu, ec->n_ips);
+- VG_(pp_StackTrace)( ec->ips, ec->n_ips );
++ // FIXME JRS 27 July 2017: is a fake epoch here OK?
++ DiEpoch ep = VG_(current_DiEpoch)();
++ VG_(pp_StackTrace)( ep, ec->ips, ec->n_ips );
+ }
+ }
+ VG_(message)(Vg_DebugMsg,
+@@ -202,13 +204,6 @@ void VG_(print_ExeContext_stats) ( Bool
+ }
+
+
+-/* Print an ExeContext. */
+-void VG_(pp_ExeContext) ( ExeContext* ec )
+-{
+- VG_(pp_StackTrace)( ec->ips, ec->n_ips );
+-}
+-
+-
+ /* Compare two ExeContexts. Number of callers considered depends on res. */
+ Bool VG_(eq_ExeContext) ( VgRes res, const ExeContext* e1,
+ const ExeContext* e2 )
+@@ -544,12 +539,48 @@ ExeContext* VG_(make_ExeContext_from_Sta
+ return record_ExeContext_wrk2(ips, n_ips);
+ }
+
+-ExeContext* VG_(null_ExeContext) (void)
++
++/*------------------------------------------------------------*/
++/*--- ExeContextAndEpoch functions. ---*/
++/*------------------------------------------------------------*/
++
++ExeContextAndEpoch VG_(tag_EC_with_current_epoch)( ExeContext* ec )
++{
++ ExeContextAndEpoch ece;
++ ece.ec = ec;
++ ece.epoch = VG_(current_DiEpoch)();
++ return ece;
++}
++
++ExeContextAndEpoch VG_(invalid_ExeContextAndEpoch) ( void )
++{
++ ExeContextAndEpoch ece;
++ ece.ec = NULL/*invalid ExeContext*/;
++ ece.epoch.n = 0/*invalid epoch*/;
++ return ece;
++}
++
++
++void VG_(pp_ExeContextAndEpoch) ( ExeContextAndEpoch ece )
++{
++ VG_(pp_StackTrace)( ece.epoch, ece.ec->ips, ece.ec->n_ips );
++}
++
++ExeContextAndEpoch VG_(null_ExeContextAndEpoch) ( void )
+ {
+ init_ExeContext_storage();
+- return null_ExeContext;
++ ExeContextAndEpoch ece
++ = mk_ExeContextAndEpoch(null_ExeContext, VG_(current_DiEpoch)());
++ return ece;
+ }
+
++Bool VG_(is_null_ExeContextAndEpoch)( ExeContextAndEpoch ece )
++{
++ init_ExeContext_storage();
++ return ece.ec == null_ExeContext;
++}
++
++
+ /*--------------------------------------------------------------------*/
+ /*--- end m_execontext.c ---*/
+ /*--------------------------------------------------------------------*/
+Index: valgrind-3.13.0/coregrind/m_gdbserver/m_gdbserver.c
+===================================================================
+--- valgrind-3.13.0.orig/coregrind/m_gdbserver/m_gdbserver.c
++++ valgrind-3.13.0/coregrind/m_gdbserver/m_gdbserver.c
+@@ -142,14 +142,17 @@ static HChar* sym (Addr addr, Bool is_co
+ PtrdiffT offset;
+ if (w == 2) w = 0;
+
++ // FIXME JRS 28 July 2017: HACK! Is this correct?
++ const DiEpoch ep = VG_(current_DiEpoch)();
++
+ if (is_code) {
+ const HChar *name;
+- name = VG_(describe_IP) (addr, NULL);
++ name = VG_(describe_IP) (ep, addr, NULL);
+ if (buf[w]) VG_(free)(buf[w]);
+ buf[w] = VG_(strdup)("gdbserver sym", name);
+ } else {
+ const HChar *name;
+- VG_(get_datasym_and_offset) (addr, &name, &offset);
++ VG_(get_datasym_and_offset) (ep, addr, &name, &offset);
+ if (buf[w]) VG_(free)(buf[w]);
+ buf[w] = VG_(strdup)("gdbserver sym", name);
+ }
+Index: valgrind-3.13.0/coregrind/m_gdbserver/server.c
+===================================================================
+--- valgrind-3.13.0.orig/coregrind/m_gdbserver/server.c
++++ valgrind-3.13.0/coregrind/m_gdbserver/server.c
+@@ -195,6 +195,9 @@ int handle_gdb_valgrind_command (char *m
+ int kwdid;
+ int int_value;
+
++ // FIXME JRS 28 July 2017: HACK! Is this correct?
++ const DiEpoch ep = VG_(current_DiEpoch)();
++
+ vg_assert (initial_valgrind_sink_saved);
+
+ strcpy (s, mon);
+@@ -334,7 +337,7 @@ int handle_gdb_valgrind_command (char *m
+ }
+ if (hostvisibility) {
+ const DebugInfo *tooldi
+- = VG_(find_DebugInfo) ((Addr)handle_gdb_valgrind_command);
++ = VG_(find_DebugInfo) (ep, (Addr)handle_gdb_valgrind_command);
+ /* Normally, we should always find the tooldi. In case we
+ do not, suggest a 'likely somewhat working' address: */
+ const Addr tool_text_start
+@@ -442,14 +445,14 @@ int handle_gdb_valgrind_command (char *m
+ &dummy_sz, &ssaveptr)) {
+ // If tool provides location information, use that.
+ if (VG_(needs).info_location) {
+- VG_TDICT_CALL(tool_info_location, address);
++ VG_TDICT_CALL(tool_info_location, ep, address);
+ }
+ // If tool does not provide location info, use the common one.
+ // Also use the common to compare with tool when debug log is set.
+ if (!VG_(needs).info_location || VG_(debugLog_getLevel)() > 0 ) {
+ AddrInfo ai;
+ ai.tag = Addr_Undescribed;
+- VG_(describe_addr) (address, &ai);
++ VG_(describe_addr) (ep, address, &ai);
+ VG_(pp_addrinfo) (address, &ai);
+ VG_(clear_addrinfo) (&ai);
+ }
+Index: valgrind-3.13.0/coregrind/m_gdbserver/target.c
+===================================================================
+--- valgrind-3.13.0.orig/coregrind/m_gdbserver/target.c
++++ valgrind-3.13.0/coregrind/m_gdbserver/target.c
+@@ -209,7 +209,10 @@ void gdbserver_process_exit_encountered
+ static
+ const HChar* sym (Addr addr)
+ {
+- return VG_(describe_IP) (addr, NULL);
++ // FIXME JRS 28 July 2017: HACK! Is this correct?
++ const DiEpoch ep = VG_(current_DiEpoch)();
++
++ return VG_(describe_IP) (ep, addr, NULL);
+ }
+
+ ThreadId vgdb_interrupted_tid = 0;
+Index: valgrind-3.13.0/coregrind/m_gdbserver/valgrind-low-arm.c
+===================================================================
+--- valgrind-3.13.0.orig/coregrind/m_gdbserver/valgrind-low-arm.c
++++ valgrind-3.13.0/coregrind/m_gdbserver/valgrind-low-arm.c
+@@ -149,8 +149,12 @@ Addr thumb_pc (Addr pc)
+ // the debug info with the bit0 set
+ // (why can't debug info do that for us ???)
+ // (why if this is a 4 bytes thumb instruction ???)
+- if (VG_(get_fnname_raw) (pc | 1, &fnname)) {
+- if (VG_(lookup_symbol_SLOW)( "*", fnname, &avmas )) {
++
++ // FIXME JRS 28 July 2017: HACK! Is this correct?
++ const DiEpoch ep = VG_(current_DiEpoch)();
++
++ if (VG_(get_fnname_raw) (ep, pc | 1, &fnname)) {
++ if (VG_(lookup_symbol_SLOW)( ep, "*", fnname, &avmas )) {
+ dlog (1, "fnname %s lookupsym %p => %p %s.\n",
+ fnname, C2v(avmas.main), C2v(pc),
+ (avmas.main & 1 ? "thumb" : "arm"));
+Index: valgrind-3.13.0/coregrind/m_gdbserver/valgrind-low-mips32.c
+===================================================================
+--- valgrind-3.13.0.orig/coregrind/m_gdbserver/valgrind-low-mips32.c
++++ valgrind-3.13.0/coregrind/m_gdbserver/valgrind-low-mips32.c
+@@ -228,7 +228,11 @@ static Addr mips_adjust_breakpoint_addre
+ /* Make sure we don't scan back before the beginning of the current
+ function, since we may fetch constant data or insns that look like
+ a jump. */
+- if (VG_(get_inst_offset_in_function) (bpaddr, &offset)) {
++
++ // FIXME JRS 28 July 2017: HACK! Is this correct?
++ const DiEpoch ep = VG_(current_DiEpoch)();
++
++ if (VG_(get_inst_offset_in_function) (ep, bpaddr, &offset)) {
+ func_addr = bpaddr - offset;
+ if (func_addr > boundary && func_addr <= bpaddr)
+ boundary = func_addr;
+Index: valgrind-3.13.0/coregrind/m_gdbserver/valgrind-low-mips64.c
+===================================================================
+--- valgrind-3.13.0.orig/coregrind/m_gdbserver/valgrind-low-mips64.c
++++ valgrind-3.13.0/coregrind/m_gdbserver/valgrind-low-mips64.c
+@@ -229,7 +229,11 @@ static Addr mips_adjust_breakpoint_addre
+ /* Make sure we don't scan back before the beginning of the current
+ function, since we may fetch constant data or insns that look like
+ a jump. */
+- if (VG_(get_inst_offset_in_function) (bpaddr, &offset)) {
++
++ // FIXME JRS 28 July 2017: HACK! Is this correct?
++ const DiEpoch ep = VG_(current_DiEpoch)();
++
++ if (VG_(get_inst_offset_in_function) (ep, bpaddr, &offset)) {
+ func_addr = bpaddr - offset;
+ if (func_addr > boundary && func_addr <= bpaddr)
+ boundary = func_addr;
+Index: valgrind-3.13.0/coregrind/m_libcassert.c
+===================================================================
+--- valgrind-3.13.0.orig/coregrind/m_libcassert.c
++++ valgrind-3.13.0/coregrind/m_libcassert.c
+@@ -369,7 +369,7 @@ static void show_sched_status_wrk ( Bool
+ );
+ VG_(printf)("\nhost stacktrace:\n");
+ VG_(clo_xml) = False;
+- VG_(pp_StackTrace) (ips, n_ips);
++ VG_(pp_StackTrace) (VG_(current_DiEpoch)(), ips, n_ips);
+ VG_(clo_xml) = save_clo_xml;
+ }
+
+Index: valgrind-3.13.0/coregrind/m_main.c
+===================================================================
+--- valgrind-3.13.0.orig/coregrind/m_main.c
++++ valgrind-3.13.0/coregrind/m_main.c
+@@ -128,6 +128,10 @@ static void usage_NORETURN ( Bool debug_
+ " --error-exitcode=<number> exit code to return if errors found [0=disable]\n"
+ " --error-markers=<begin>,<end> add lines with begin/end markers before/after\n"
+ " each error output in plain text mode [none]\n"
++" --keep-debuginfo=no|yes Keep symbols etc for unloaded code [no]\n"
++" This allows stack traces for memory leaks to\n"
++" include file/line info for code that has been\n"
++" dlclose'd (or similar)\n"
+ " --show-below-main=no|yes continue stack traces below main() [no]\n"
+ " --default-suppressions=yes|no\n"
+ " load default suppressions [yes]\n"
+@@ -626,6 +630,7 @@ void main_process_cmd_line_options( void
+ else if VG_BOOL_CLO(arg, "--run-libc-freeres", VG_(clo_run_libc_freeres)) {}
+ else if VG_BOOL_CLO(arg, "--run-cxx-freeres", VG_(clo_run_cxx_freeres)) {}
+ else if VG_BOOL_CLO(arg, "--show-below-main", VG_(clo_show_below_main)) {}
++ else if VG_BOOL_CLO(arg, "--keep-debuginfo", VG_(clo_keep_debuginfo)) {}
+ else if VG_BOOL_CLO(arg, "--time-stamp", VG_(clo_time_stamp)) {}
+ else if VG_BOOL_CLO(arg, "--track-fds", VG_(clo_track_fds)) {}
+ else if VG_BOOL_CLO(arg, "--trace-children", VG_(clo_trace_children)) {}
+Index: valgrind-3.13.0/coregrind/m_options.c
+===================================================================
+--- valgrind-3.13.0.orig/coregrind/m_options.c
++++ valgrind-3.13.0/coregrind/m_options.c
+@@ -129,6 +129,7 @@ Bool VG_(clo_run_libc_freeres) = True;
+ Bool VG_(clo_run_cxx_freeres) = True;
+ Bool VG_(clo_track_fds) = False;
+ Bool VG_(clo_show_below_main)= False;
++Bool VG_(clo_keep_debuginfo) = False;
+ Bool VG_(clo_show_emwarns) = False;
+ Word VG_(clo_max_stackframe) = 2000000;
+ UInt VG_(clo_max_threads) = MAX_THREADS_DEFAULT;
+Index: valgrind-3.13.0/coregrind/m_redir.c
+===================================================================
+--- valgrind-3.13.0.orig/coregrind/m_redir.c
++++ valgrind-3.13.0/coregrind/m_redir.c
+@@ -1859,15 +1859,16 @@ static void show_active ( const HChar* l
+ {
+ Bool ok;
+ const HChar *buf;
+-
+- ok = VG_(get_fnname_w_offset)(act->from_addr, &buf);
++
++ DiEpoch ep = VG_(current_DiEpoch)();
++ ok = VG_(get_fnname_w_offset)(ep, act->from_addr, &buf);
+ if (!ok) buf = "???";
+ // Stash away name1
+ HChar name1[VG_(strlen)(buf) + 1];
+ VG_(strcpy)(name1, buf);
+
+ const HChar *name2;
+- ok = VG_(get_fnname_w_offset)(act->to_addr, &name2);
++ ok = VG_(get_fnname_w_offset)(ep, act->to_addr, &name2);
+ if (!ok) name2 = "???";
+
+ VG_(message)(Vg_DebugMsg, "%s0x%08lx (%-20s) %s-> (%04d.%d) 0x%08lx %s\n",
+Index: valgrind-3.13.0/coregrind/m_sbprofile.c
+===================================================================
+--- valgrind-3.13.0.orig/coregrind/m_sbprofile.c
++++ valgrind-3.13.0/coregrind/m_sbprofile.c
+@@ -74,6 +74,9 @@ void show_SB_profile ( const SBProfEntry
+
+ VG_(printf)("Total score = %'llu\n\n", score_total);
+
++ // FIXME JRS 28 July 2017: this is probably not right in general
++ DiEpoch ep = VG_(current_DiEpoch)();
++
+ /* Print an initial per-block summary. */
+ VG_(printf)("rank ---cumulative--- -----self-----\n");
+ score_cumul = 0;
+@@ -84,7 +87,7 @@ void show_SB_profile ( const SBProfEntry
+ continue;
+
+ const HChar *name;
+- VG_(get_fnname_w_offset)(tops[r].addr, &name);
++ VG_(get_fnname_w_offset)(ep, tops[r].addr, &name);
+
+ score_here = tops[r].score;
+ score_cumul += score_here;
+@@ -123,7 +126,7 @@ void show_SB_profile ( const SBProfEntry
+ continue;
+
+ const HChar *name;
+- VG_(get_fnname_w_offset)(tops[r].addr, &name);
++ VG_(get_fnname_w_offset)(ep, tops[r].addr, &name);
+
+ score_here = tops[r].score;
+ score_cumul += score_here;
+@@ -159,7 +162,7 @@ void show_SB_profile ( const SBProfEntry
+ continue;
+
+ const HChar *name;
+- VG_(get_fnname_w_offset)(tops[r].addr, &name);
++ VG_(get_fnname_w_offset)(ep, tops[r].addr, &name);
+
+ score_here = tops[r].score;
+
+Index: valgrind-3.13.0/coregrind/m_scheduler/scheduler.c
+===================================================================
+--- valgrind-3.13.0.orig/coregrind/m_scheduler/scheduler.c
++++ valgrind-3.13.0/coregrind/m_scheduler/scheduler.c
+@@ -2037,8 +2037,12 @@ void do_client_request ( ThreadId tid )
+
+ VG_(memset)(buf64, 0, 64);
+ UInt linenum = 0;
++
++ // FIXME JRS 28 July 2017: HACK! Is this correct?
++ const DiEpoch ep = VG_(current_DiEpoch)();
++
+ Bool ok = VG_(get_filename_linenum)(
+- ip, &buf, NULL, &linenum
++ ep, ip, &buf, NULL, &linenum
+ );
+ if (ok) {
+ /* For backward compatibility truncate the filename to
+Index: valgrind-3.13.0/coregrind/m_signals.c
+===================================================================
+--- valgrind-3.13.0.orig/coregrind/m_signals.c
++++ valgrind-3.13.0/coregrind/m_signals.c
+@@ -1878,7 +1878,7 @@ static void default_action(const vki_sig
+ : VG_(record_depth_1_ExeContext)( tid,
+ first_ip_delta );
+ vg_assert(ec);
+- VG_(pp_ExeContext)( ec );
++ VG_(pp_ExeContextAndEpoch)( VG_(tag_EC_with_current_epoch)(ec) );
+ }
+ if (sigNo == VKI_SIGSEGV
+ && is_signal_from_kernel(tid, sigNo, info->si_code)
+Index: valgrind-3.13.0/coregrind/m_stacktrace.c
+===================================================================
+--- valgrind-3.13.0.orig/coregrind/m_stacktrace.c
++++ valgrind-3.13.0/coregrind/m_stacktrace.c
+@@ -446,6 +446,7 @@ UInt VG_(get_StackTrace_wrk) ( ThreadId
+ /* And, similarly, try for MSVC FPO unwind info. */
+ if (FPO_info_present
+ && VG_(use_FPO_info)( &uregs.xip, &uregs.xsp, &uregs.xbp,
++ VG_(current_DiEpoch)(),
+ fp_min, fp_max ) ) {
+ if (debug) unwind_case = "MS";
+ if (do_stats) stats.MS++;
+@@ -1539,12 +1540,12 @@ UInt VG_(get_StackTrace) ( ThreadId tid,
+ stack_highest_byte);
+ }
+
+-static void printIpDesc(UInt n, Addr ip, void* uu_opaque)
++static void printIpDesc(UInt n, DiEpoch ep, Addr ip, void* uu_opaque)
+ {
+- InlIPCursor *iipc = VG_(new_IIPC)(ip);
++ InlIPCursor *iipc = VG_(new_IIPC)(ep, ip);
+
+ do {
+- const HChar *buf = VG_(describe_IP)(ip, iipc);
++ const HChar *buf = VG_(describe_IP)(ep, ip, iipc);
+ if (VG_(clo_xml)) {
+ VG_(printf_xml)(" %s\n", buf);
+ } else {
+@@ -1558,14 +1559,14 @@ static void printIpDesc(UInt n, Addr ip,
+ }
+
+ /* Print a StackTrace. */
+-void VG_(pp_StackTrace) ( StackTrace ips, UInt n_ips )
++void VG_(pp_StackTrace) ( DiEpoch ep, StackTrace ips, UInt n_ips )
+ {
+ vg_assert( n_ips > 0 );
+
+ if (VG_(clo_xml))
+ VG_(printf_xml)(" <stack>\n");
+
+- VG_(apply_StackTrace)( printIpDesc, NULL, ips, n_ips );
++ VG_(apply_StackTrace)( printIpDesc, NULL, ep, ips, n_ips );
+
+ if (VG_(clo_xml))
+ VG_(printf_xml)(" </stack>\n");
+@@ -1580,13 +1581,13 @@ void VG_(get_and_pp_StackTrace) ( Thread
+ NULL/*array to dump SP values in*/,
+ NULL/*array to dump FP values in*/,
+ 0/*first_ip_delta*/);
+- VG_(pp_StackTrace)(ips, n_ips);
++ VG_(pp_StackTrace)(VG_(current_DiEpoch)(), ips, n_ips);
+ }
+
+ void VG_(apply_StackTrace)(
+- void(*action)(UInt n, Addr ip, void* opaque),
++ void(*action)(UInt n, DiEpoch ep, Addr ip, void* opaque),
+ void* opaque,
+- StackTrace ips, UInt n_ips
++ DiEpoch ep, StackTrace ips, UInt n_ips
+ )
+ {
+ Int i;
+@@ -1597,7 +1598,7 @@ void VG_(apply_StackTrace)(
+ // or the last appearance of a below main function.
+ // Then decrease n_ips so as to not call action for the below main
+ for (i = n_ips - 1; i >= 0; i--) {
+- Vg_FnNameKind kind = VG_(get_fnname_kind_from_IP)(ips[i]);
++ Vg_FnNameKind kind = VG_(get_fnname_kind_from_IP)(ep, ips[i]);
+ if (Vg_FnNameMain == kind || Vg_FnNameBelowMain == kind)
+ n_ips = i + 1;
+ if (Vg_FnNameMain == kind)
+@@ -1607,7 +1608,7 @@ void VG_(apply_StackTrace)(
+
+ for (i = 0; i < n_ips; i++)
+ // Act on the ip
+- action(i, ips[i], opaque);
++ action(i, ep, ips[i], opaque);
+ }
+
+
+Index: valgrind-3.13.0/coregrind/m_syswrap/syswrap-generic.c
+===================================================================
+--- valgrind-3.13.0.orig/coregrind/m_syswrap/syswrap-generic.c
++++ valgrind-3.13.0/coregrind/m_syswrap/syswrap-generic.c
+@@ -540,7 +540,8 @@ typedef struct OpenFd
+ {
+ Int fd; /* The file descriptor */
+ HChar *pathname; /* NULL if not a regular file or unknown */
+- ExeContext *where; /* NULL if inherited from parent */
++ ExeContextAndEpoch where; /* VG_(null_ExeContextAndEpoch)
++ if inherited from parent */
+ struct OpenFd *next, *prev;
+ } OpenFd;
+
+@@ -614,7 +615,10 @@ void ML_(record_fd_open_with_given_name)
+
+ i->fd = fd;
+ i->pathname = VG_(strdup)("syswrap.rfdowgn.2", pathname);
+- i->where = (tid == -1) ? NULL : VG_(record_ExeContext)(tid, 0/*first_ip_delta*/);
++ i->where = (tid == -1)
++ ? VG_(null_ExeContextAndEpoch)()
++ : VG_(tag_EC_with_current_epoch)(
++ VG_(record_ExeContext)(tid, 0/*first_ip_delta*/));
+ }
+
+ // Record opening of an fd, and find its name.
+@@ -846,8 +850,8 @@ void VG_(show_open_fds) (const HChar* wh
+ }
+ }
+
+- if(i->where) {
+- VG_(pp_ExeContext)(i->where);
++ if (!VG_(is_null_ExeContextAndEpoch)(i->where)) {
++ VG_(pp_ExeContextAndEpoch)(i->where);
+ VG_(message)(Vg_UserMsg, "\n");
+ } else {
+ VG_(message)(Vg_UserMsg, " <inherited from parent>\n");
+Index: valgrind-3.13.0/coregrind/m_tooliface.c
+===================================================================
+--- valgrind-3.13.0.orig/coregrind/m_tooliface.c
++++ valgrind-3.13.0/coregrind/m_tooliface.c
+@@ -323,7 +323,7 @@ void VG_(needs_print_stats) (
+ }
+
+ void VG_(needs_info_location) (
+- void (*info_location)(Addr)
++ void (*info_location)(DiEpoch, Addr)
+ )
+ {
+ VG_(needs).info_location = True;
+Index: valgrind-3.13.0/coregrind/m_translate.c
+===================================================================
+--- valgrind-3.13.0.orig/coregrind/m_translate.c
++++ valgrind-3.13.0/coregrind/m_translate.c
+@@ -1527,24 +1527,25 @@ Bool VG_(translate) ( ThreadId tid,
+ Bool ok;
+ const HChar *buf;
+ const HChar *name2;
++ const DiEpoch ep = VG_(current_DiEpoch)();
+
+ /* Try also to get the soname (not the filename) of the "from"
+ object. This makes it much easier to debug redirection
+ problems. */
+ const HChar* nraddr_soname = "???";
+- DebugInfo* nraddr_di = VG_(find_DebugInfo)(nraddr);
++ DebugInfo* nraddr_di = VG_(find_DebugInfo)(ep, nraddr);
+ if (nraddr_di) {
+ const HChar* t = VG_(DebugInfo_get_soname)(nraddr_di);
+ if (t)
+ nraddr_soname = t;
+ }
+
+- ok = VG_(get_fnname_w_offset)(nraddr, &buf);
++ ok = VG_(get_fnname_w_offset)(ep, nraddr, &buf);
+ if (!ok) buf = "???";
+ // Stash away name1
+ HChar name1[VG_(strlen)(buf) + 1];
+ VG_(strcpy)(name1, buf);
+- ok = VG_(get_fnname_w_offset)(addr, &name2);
++ ok = VG_(get_fnname_w_offset)(ep, addr, &name2);
+ if (!ok) name2 = "???";
+
+ VG_(message)(Vg_DebugMsg,
+@@ -1561,7 +1562,8 @@ Bool VG_(translate) ( ThreadId tid,
+ if (VG_(clo_trace_flags) || debugging_translation) {
+ const HChar* objname = "UNKNOWN_OBJECT";
+ OffT objoff = 0;
+- DebugInfo* di = VG_(find_DebugInfo)( addr );
++ const DiEpoch ep = VG_(current_DiEpoch)();
++ DebugInfo* di = VG_(find_DebugInfo)( ep, addr );
+ if (di) {
+ objname = VG_(DebugInfo_get_filename)(di);
+ objoff = addr - VG_(DebugInfo_get_text_bias)(di);
+@@ -1569,7 +1571,7 @@ Bool VG_(translate) ( ThreadId tid,
+ vg_assert(objname);
+
+ const HChar *fnname;
+- Bool ok = VG_(get_fnname_w_offset)(addr, &fnname);
++ Bool ok = VG_(get_fnname_w_offset)(ep, addr, &fnname);
+ if (!ok) fnname = "UNKNOWN_FUNCTION";
+ VG_(printf)(
+ "==== SB %u (evchecks %llu) [tid %u] 0x%lx %s %s%c0x%lx\n",
+Index: valgrind-3.13.0/coregrind/m_xtree.c
+===================================================================
+--- valgrind-3.13.0.orig/coregrind/m_xtree.c
++++ valgrind-3.13.0/coregrind/m_xtree.c
+@@ -438,6 +438,9 @@ void VG_(XT_callgrind_print)
+ const HChar* filename_dir;
+ const HChar* filename_name;
+
++ // FIXME JRS 28 July 2017: HACK! Is this correct?
++ const DiEpoch ep = VG_(current_DiEpoch)();
++
+ if (fp == NULL)
+ return;
+
+@@ -501,7 +504,7 @@ void VG_(XT_callgrind_print)
+ // the strings called_filename/called_fnname.
+ #define CALLED_FLF(n) \
+ if ((n) < 0 \
+- || !VG_(get_filename_linenum)(ips[(n)], \
++ || !VG_(get_filename_linenum)(ep, ips[(n)], \
+ &filename_name, \
+ &filename_dir, \
+ &called_linenum)) { \
+@@ -509,7 +512,7 @@ void VG_(XT_callgrind_print)
+ called_linenum = 0; \
+ } \
+ if ((n) < 0 \
+- || !VG_(get_fnname)(ips[(n)], &called_fnname)) { \
++ || !VG_(get_fnname)(ep, ips[(n)], &called_fnname)) { \
+ called_fnname = "UnknownFn???"; \
+ } \
+ { \
+@@ -554,7 +557,9 @@ void VG_(XT_callgrind_print)
+
+ if (0) {
+ VG_(printf)("entry img %s\n", img);
+- VG_(pp_ExeContext)(xe->ec);
++ // JRS 27 July 2017: it may be a hack to use the current epoch
++ // here. I don't know.
++ VG_(pp_ExeContextAndEpoch)(VG_(tag_EC_with_current_epoch)(xe->ec));
+ VG_(printf)("\n");
+ }
+ xt->add_data_fn(xt->tmp_data, VG_(indexXA)(xt->data, xecu));
+@@ -762,11 +767,14 @@ static void ms_output_group (VgFile* fp,
+ ms_make_groups(depth+1, group->ms_ec, group->n_ec, sig_sz,
+ &n_groups, &groups);
+
++ // FIXME JRS 28 July 2017: HACK! Is this correct?
++ const DiEpoch ep = VG_(current_DiEpoch)();
++
+ FP("%*s" "n%u: %ld %s\n",
+ depth + 1, "",
+ n_groups,
+ group->total,
+- VG_(describe_IP)(group->ms_ec->ips[depth] - 1, NULL));
++ VG_(describe_IP)(ep, group->ms_ec->ips[depth] - 1, NULL));
+ /* XTREE??? Massif original code removes 1 to get the IP description. I am
+ wondering if this is not something that predates revision r8818,
+ which introduced a -1 in the stack unwind (see m_stacktrace.c)
+@@ -963,6 +971,10 @@ Int VG_(XT_offset_main_or_below_main)(Ad
+ from there.
+ If no main is found, we will then do a search for main or
+ below main function till the top. */
++
++ // FIXME JRS 28 July 2017: HACK! Is this correct?
++ const DiEpoch ep = VG_(current_DiEpoch)();
++
+ static Int deepest_main = 0;
+ Vg_FnNameKind kind = Vg_FnNameNormal;
+ Int mbm = n_ips - 1; // Position of deepest main or below main.
+@@ -972,7 +984,7 @@ Int VG_(XT_offset_main_or_below_main)(Ad
+ for (i = n_ips - 1 - deepest_main;
+ i < n_ips;
+ i++) {
+- mbmkind = VG_(get_fnname_kind_from_IP)(ips[i]);
++ mbmkind = VG_(get_fnname_kind_from_IP)(ep, ips[i]);
+ if (mbmkind != Vg_FnNameNormal) {
+ mbm = i;
+ break;
+@@ -983,7 +995,7 @@ Int VG_(XT_offset_main_or_below_main)(Ad
+ for (i = mbm - 1;
+ i >= 0 && mbmkind != Vg_FnNameMain;
+ i--) {
+- kind = VG_(get_fnname_kind_from_IP)(ips[i]);
++ kind = VG_(get_fnname_kind_from_IP)(ep, ips[i]);
+ if (kind != Vg_FnNameNormal) {
+ mbm = i;
+ mbmkind = kind;
+Index: valgrind-3.13.0/coregrind/pub_core_debuginfo.h
+===================================================================
+--- valgrind-3.13.0.orig/coregrind/pub_core_debuginfo.h
++++ valgrind-3.13.0/coregrind/pub_core_debuginfo.h
+@@ -86,20 +86,21 @@ extern void VG_(di_discard_ALL_debuginfo
+ * It should only be used in cases where the names of interest will have
+ * particular (ie. non-mangled) forms, or the mangled form is acceptable. */
+ extern
+-Bool VG_(get_fnname_raw) ( Addr a, const HChar** buf );
++Bool VG_(get_fnname_raw) ( DiEpoch ep, Addr a, const HChar** buf );
+
+ /* Like VG_(get_fnname), but without C++ demangling. (But it does
+ Z-demangling and below-main renaming.)
+ iipc argument: same usage as in VG_(describe_IP) in pub_tool_debuginfo.h. */
+ extern
+-Bool VG_(get_fnname_no_cxx_demangle) ( Addr a, const HChar** buf,
++Bool VG_(get_fnname_no_cxx_demangle) ( DiEpoch ep, Addr a, const HChar** buf,
+ const InlIPCursor* iipc );
+
+ /* mips-linux only: find the offset of current address. This is needed for
+ stack unwinding for MIPS.
+ */
+ extern
+-Bool VG_(get_inst_offset_in_function)( Addr a, /*OUT*/PtrdiffT* offset );
++Bool VG_(get_inst_offset_in_function)( DiEpoch ep, Addr a,
++ /*OUT*/PtrdiffT* offset );
+
+
+ /* Use DWARF2/3 CFA information to do one step of stack unwinding.
+@@ -158,6 +159,7 @@ extern Bool VG_(FPO_info_present)(void);
+ extern Bool VG_(use_FPO_info) ( /*MOD*/Addr* ipP,
+ /*MOD*/Addr* spP,
+ /*MOD*/Addr* fpP,
++ DiEpoch ep,
+ Addr min_accessible,
+ Addr max_accessible );
+
+@@ -217,7 +219,7 @@ void VG_(DebugInfo_syms_getidx) ( const
+ /* ppc64-linux only: find the TOC pointer (R2 value) that should be in
+ force at the entry point address of the function containing
+ guest_code_addr. Returns 0 if not known. */
+-extern Addr VG_(get_tocptr) ( Addr guest_code_addr );
++extern Addr VG_(get_tocptr) ( DiEpoch ep, Addr guest_code_addr );
+
+ /* Map a function name to its SymAVMAs. Is done by
+ sequential search of all symbol tables, so is very slow. To
+@@ -227,7 +229,8 @@ extern Addr VG_(get_tocptr) ( Addr guest
+ platforms, a symbol is deemed to be found only if it has a nonzero
+ TOC pointer. */
+ extern
+-Bool VG_(lookup_symbol_SLOW)(const HChar* sopatt, const HChar* name,
++Bool VG_(lookup_symbol_SLOW)(DiEpoch ep,
++ const HChar* sopatt, const HChar* name,
+ SymAVMAs* avmas);
+
+ #endif // __PUB_CORE_DEBUGINFO_H
+Index: valgrind-3.13.0/coregrind/pub_core_tooliface.h
+===================================================================
+--- valgrind-3.13.0.orig/coregrind/pub_core_tooliface.h
++++ valgrind-3.13.0/coregrind/pub_core_tooliface.h
+@@ -156,7 +156,7 @@ typedef struct {
+ void (*tool_print_stats)(void);
+
+ // VG_(needs).info_location
+- void (*tool_info_location)(Addr a);
++ void (*tool_info_location)(DiEpoch ep, Addr a);
+
+ // VG_(needs).malloc_replacement
+ void* (*tool_malloc) (ThreadId, SizeT);
+Index: valgrind-3.13.0/docs/xml/manual-core.xml
+===================================================================
+--- valgrind-3.13.0.orig/docs/xml/manual-core.xml
++++ valgrind-3.13.0/docs/xml/manual-core.xml
+@@ -1219,6 +1219,19 @@ that can report errors, e.g. Memcheck, b
+ </listitem>
+ </varlistentry>
+
++ <varlistentry id="opt.keep-debuginfo" xreflabel="--keep-debuginfo">
++ <term>
++ <option><![CDATA[--keep-debuginfo=<yes|no> [default: no] ]]></option>
++ </term>
++ <listitem>
++ <para>When enabled, keep symbols and all other debuginfo for unloaded
++ code. This allows stack traces for memory leaks to include file/line
++ info for code that has been dlclose'd (or similar). Be careful with
++ this, since it can lead to unbounded memory use for programs which
++ repeatedly load and unload shard objects.</para>
++ </listitem>
++ </varlistentry>
++
+ <varlistentry id="opt.show-below-main" xreflabel="--show-below-main">
+ <term>
+ <option><![CDATA[--show-below-main=<yes|no> [default: no] ]]></option>
+Index: valgrind-3.13.0/drd/drd_error.c
+===================================================================
+--- valgrind-3.13.0.orig/drd/drd_error.c
++++ valgrind-3.13.0/drd/drd_error.c
+@@ -139,12 +139,14 @@ static void first_observed(const Addr ob
+ " <what>%pS</what>\n"
+ " <address>0x%lx</address>\n",
+ DRD_(clientobj_type_name)(cl->any.type), obj);
+- VG_(pp_ExeContext)(cl->any.first_observed_at);
++ VG_(pp_ExeContextAndEpoch)(
++ VG_(tag_EC_with_current_epoch)(cl->any.first_observed_at));
+ print_err_detail(" </first_observed_at>\n");
+ } else {
+ print_err_detail("%s 0x%lx was first observed at:\n",
+ DRD_(clientobj_type_name)(cl->any.type), obj);
+- VG_(pp_ExeContext)(cl->any.first_observed_at);
++ VG_(pp_ExeContextAndEpoch)(
++ VG_(tag_EC_with_current_epoch)(cl->any.first_observed_at));
+ }
+ }
+ }
+@@ -161,6 +163,7 @@ void drd_report_data_race(const Error* c
+ const HChar* const indent = xml ? " " : "";
+ AddrInfo ai;
+
++ DiEpoch ep = VG_(current_DiEpoch)();
+ XArray* /* of HChar */ descr1
+ = VG_(newXA)( VG_(malloc), "drd.error.drdr2.1",
+ VG_(free), sizeof(HChar) );
+@@ -172,7 +175,7 @@ void drd_report_data_race(const Error* c
+ tl_assert(dri->addr);
+ tl_assert(dri->size > 0);
+
+- (void) VG_(get_data_description)(descr1, descr2, dri->addr);
++ (void) VG_(get_data_description)(descr1, descr2, ep, dri->addr);
+ /* If there's nothing in descr1/2, free them. Why is it safe to
+ VG_(indexXA) at zero here? Because VG_(get_data_description)
+ guarantees to zero terminate descr1/2 regardless of the outcome
+@@ -202,7 +205,7 @@ void drd_report_data_race(const Error* c
+ what_prefix, dri->access_type == eStore ? "store" : "load",
+ dri->tid, dri->addr, dri->size, what_suffix);
+
+- VG_(pp_ExeContext)(VG_(get_error_where)(err));
++ VG_(pp_ExeContextAndEpoch)(VG_(get_error_where)(err));
+ if (descr1 != NULL) {
+ print_err_detail("%s%s\n", indent, (HChar*)VG_(indexXA)(descr1, 0));
+ if (descr2 != NULL)
+@@ -216,7 +219,7 @@ void drd_report_data_race(const Error* c
+ print_err_detail(" <allocation_context>\n");
+ else
+ print_err_detail(" Allocation context:\n");
+- VG_(pp_ExeContext)(ai.lastchange);
++ VG_(pp_ExeContextAndEpoch)(mk_ExeContextAndEpoch(ai.lastchange, ep));
+ if (xml)
+ print_err_detail(" </allocation_context>\n");
+ } else {
+@@ -322,7 +325,7 @@ static void drd_tool_error_pp(const Erro
+ print_err_detail("%sThe object at address 0x%lx is not a mutex.%s\n",
+ what_prefix, p->mutex, what_suffix);
+ }
+- VG_(pp_ExeContext)(VG_(get_error_where)(e));
++ VG_(pp_ExeContextAndEpoch)(VG_(get_error_where)(e));
+ first_observed(p->mutex);
+ break;
+ }
+@@ -330,7 +333,7 @@ static void drd_tool_error_pp(const Erro
+ CondErrInfo* cdei =(CondErrInfo*)(VG_(get_error_extra)(e));
+ print_err_detail("%s%s: cond 0x%lx%s\n", what_prefix,
+ VG_(get_error_string)(e), cdei->cond, what_suffix);
+- VG_(pp_ExeContext)(VG_(get_error_where)(e));
++ VG_(pp_ExeContextAndEpoch)(VG_(get_error_where)(e));
+ first_observed(cdei->cond);
+ break;
+ }
+@@ -339,7 +342,7 @@ static void drd_tool_error_pp(const Erro
+ print_err_detail("%s%s: cond 0x%lx, mutex 0x%lx locked by thread %u%s\n",
+ what_prefix, VG_(get_error_string)(e), cdi->cond,
+ cdi->mutex, cdi->owner, what_suffix);
+- VG_(pp_ExeContext)(VG_(get_error_where)(e));
++ VG_(pp_ExeContextAndEpoch)(VG_(get_error_where)(e));
+ first_observed(cdi->mutex);
+ break;
+ }
+@@ -349,7 +352,7 @@ static void drd_tool_error_pp(const Erro
+ " has been signaled but the associated mutex 0x%lx is"
+ " not locked by the signalling thread.%s\n",
+ what_prefix, cei->cond, cei->mutex, what_suffix);
+- VG_(pp_ExeContext)(VG_(get_error_where)(e));
++ VG_(pp_ExeContextAndEpoch)(VG_(get_error_where)(e));
+ first_observed(cei->cond);
+ first_observed(cei->mutex);
+ break;
+@@ -359,7 +362,7 @@ static void drd_tool_error_pp(const Erro
+ print_err_detail("%s%s: condition variable 0x%lx, mutexes 0x%lx and"
+ " 0x%lx%s\n", what_prefix, VG_(get_error_string)(e),
+ cwei->cond, cwei->mutex1, cwei->mutex2, what_suffix);
+- VG_(pp_ExeContext)(VG_(get_error_where)(e));
++ VG_(pp_ExeContextAndEpoch)(VG_(get_error_where)(e));
+ first_observed(cwei->cond);
+ first_observed(cwei->mutex1);
+ first_observed(cwei->mutex2);
+@@ -370,7 +373,7 @@ static void drd_tool_error_pp(const Erro
+ tl_assert(sei);
+ print_err_detail("%s%s: semaphore 0x%lx%s\n", what_prefix,
+ VG_(get_error_string)(e), sei->semaphore, what_suffix);
+- VG_(pp_ExeContext)(VG_(get_error_where)(e));
++ VG_(pp_ExeContextAndEpoch)(VG_(get_error_where)(e));
+ first_observed(sei->semaphore);
+ break;
+ }
+@@ -379,13 +382,14 @@ static void drd_tool_error_pp(const Erro
+ tl_assert(bei);
+ print_err_detail("%s%s: barrier 0x%lx%s\n", what_prefix,
+ VG_(get_error_string)(e), bei->barrier, what_suffix);
+- VG_(pp_ExeContext)(VG_(get_error_where)(e));
++ VG_(pp_ExeContextAndEpoch)(VG_(get_error_where)(e));
+ if (bei->other_context) {
+ if (xml)
+ print_err_detail(" <confl_wait_call>\n");
+ print_err_detail("%sConflicting wait call by thread %u:%s\n",
+ what_prefix, bei->other_tid, what_suffix);
+- VG_(pp_ExeContext)(bei->other_context);
++ VG_(pp_ExeContextAndEpoch)(
++ VG_(tag_EC_with_current_epoch)(bei->other_context));
+ if (xml)
+ print_err_detail(" </confl_wait_call>\n");
+ }
+@@ -397,7 +401,7 @@ static void drd_tool_error_pp(const Erro
+ tl_assert(p);
+ print_err_detail("%s%s: rwlock 0x%lx.%s\n", what_prefix,
+ VG_(get_error_string)(e), p->rwlock, what_suffix);
+- VG_(pp_ExeContext)(VG_(get_error_where)(e));
++ VG_(pp_ExeContextAndEpoch)(VG_(get_error_where)(e));
+ first_observed(p->rwlock);
+ break;
+ }
+@@ -409,14 +413,15 @@ static void drd_tool_error_pp(const Erro
+ print_err_detail(" <acquired_at>\n");
+ else
+ print_err_detail("Acquired at:\n");
+- VG_(pp_ExeContext)(p->acquired_at);
++ VG_(pp_ExeContextAndEpoch)(
++ VG_(tag_EC_with_current_epoch)(p->acquired_at));
+ if (xml)
+ print_err_detail(" </acquired_at>\n");
+ print_err_detail("%sLock on %s 0x%lx was held during %u ms"
+ " (threshold: %u ms).%s\n", what_prefix,
+ VG_(get_error_string)(e), p->synchronization_object,
+ p->hold_time_ms, p->threshold_ms, what_suffix);
+- VG_(pp_ExeContext)(VG_(get_error_where)(e));
++ VG_(pp_ExeContextAndEpoch)(VG_(get_error_where)(e));
+ first_observed(p->synchronization_object);
+ break;
+ }
+@@ -424,7 +429,7 @@ static void drd_tool_error_pp(const Erro
+ GenericErrInfo* gei = (GenericErrInfo*)(VG_(get_error_extra)(e));
+ print_err_detail("%s%s%s\n", what_prefix, VG_(get_error_string)(e),
+ what_suffix);
+- VG_(pp_ExeContext)(VG_(get_error_where)(e));
++ VG_(pp_ExeContextAndEpoch)(VG_(get_error_where)(e));
+ if (gei->addr)
+ first_observed(gei->addr);
+ break;
+@@ -433,7 +438,7 @@ static void drd_tool_error_pp(const Erro
+ InvalidThreadIdInfo* iti =(InvalidThreadIdInfo*)(VG_(get_error_extra)(e));
+ print_err_detail("%s%s 0x%llx%s\n", what_prefix, VG_(get_error_string)(e),
+ iti->ptid, what_suffix);
+- VG_(pp_ExeContext)(VG_(get_error_where)(e));
++ VG_(pp_ExeContextAndEpoch)(VG_(get_error_where)(e));
+ break;
+ }
+ case UnimpHgClReq: {
+@@ -441,7 +446,7 @@ static void drd_tool_error_pp(const Erro
+ print_err_detail("%sThe annotation macro %s has not yet been implemented"
+ " in %ps%s\n", what_prefix, uicr->descr,
+ "<valgrind/helgrind.h>", what_suffix);
+- VG_(pp_ExeContext)(VG_(get_error_where)(e));
++ VG_(pp_ExeContextAndEpoch)(VG_(get_error_where)(e));
+ break;
+ }
+ case UnimpDrdClReq: {
+@@ -449,13 +454,13 @@ static void drd_tool_error_pp(const Erro
+ print_err_detail("%sThe annotation macro %s has not yet been implemented"
+ " in %ps%s\n", what_prefix, uicr->descr,
+ "<valgrind/drd.h>", what_suffix);
+- VG_(pp_ExeContext)(VG_(get_error_where)(e));
++ VG_(pp_ExeContextAndEpoch)(VG_(get_error_where)(e));
+ break;
+ }
+ default:
+ print_err_detail("%s%s%s\n", what_prefix, VG_(get_error_string)(e),
+ what_suffix);
+- VG_(pp_ExeContext)(VG_(get_error_where)(e));
++ VG_(pp_ExeContextAndEpoch)(VG_(get_error_where)(e));
+ break;
+ }
+ }
+Index: valgrind-3.13.0/drd/drd_thread.c
+===================================================================
+--- valgrind-3.13.0.orig/drd/drd_thread.c
++++ valgrind-3.13.0/drd/drd_thread.c
+@@ -1338,7 +1338,8 @@ static void show_call_stack(const DrdThr
+
+ if (vg_tid != VG_INVALID_THREADID) {
+ if (callstack)
+- VG_(pp_ExeContext)(callstack);
++ VG_(pp_ExeContextAndEpoch)(
++ VG_(tag_EC_with_current_epoch)(callstack));
+ else
+ VG_(get_and_pp_StackTrace)(vg_tid, VG_(clo_backtrace_size));
+ } else {
+Index: valgrind-3.13.0/exp-bbv/bbv_main.c
+===================================================================
+--- valgrind-3.13.0.orig/exp-bbv/bbv_main.c
++++ valgrind-3.13.0/exp-bbv/bbv_main.c
+@@ -346,6 +346,7 @@ static IRSB* bbv_instrument ( VgCallback
+ IRDirty *di;
+ IRExpr **argv, *arg1;
+ Int regparms,opcode_type;
++ DiEpoch ep = VG_(current_DiEpoch)();
+
+ /* We don't handle a host/guest word size mismatch */
+ if (gWordTy != hWordTy) {
+@@ -392,8 +393,8 @@ static IRSB* bbv_instrument ( VgCallback
+ block_num++;
+ /* get function name and entry point information */
+ const HChar *fn_name;
+- VG_(get_fnname)(origAddr, &fn_name);
+- bbInfo->is_entry=VG_(get_fnname_if_entry)(origAddr, &fn_name);
++ VG_(get_fnname)(ep, origAddr, &fn_name);
++ bbInfo->is_entry=VG_(get_fnname_if_entry)(ep, origAddr, &fn_name);
+ bbInfo->fn_name =VG_(strdup)("bbv_strings", fn_name);
+ /* insert structure into table */
+ VG_(OSetGen_Insert)( instr_info_table, bbInfo );
+Index: valgrind-3.13.0/exp-dhat/dh_main.c
+===================================================================
+--- valgrind-3.13.0.orig/exp-dhat/dh_main.c
++++ valgrind-3.13.0/exp-dhat/dh_main.c
+@@ -1146,7 +1146,7 @@ static void show_APInfo ( APInfo* api )
+ bufR, bufW,
+ api->n_reads, api->n_writes);
+
+- VG_(pp_ExeContext)(api->ap);
++ VG_(pp_ExeContextAndEpoch)(VG_(tag_EC_with_current_epoch)(api->ap));
+
+ if (api->histo && api->xsize_tag == Exactly) {
+ VG_(umsg)("\nAggregated access counts by offset:\n");
+Index: valgrind-3.13.0/exp-sgcheck/pc_common.c
+===================================================================
+--- valgrind-3.13.0.orig/exp-sgcheck/pc_common.c
++++ valgrind-3.13.0/exp-sgcheck/pc_common.c
+@@ -322,7 +322,7 @@ void pc_pp_Error ( const Error* err )
+ emit( " <what>Invalid %s of size %ld</what>\n",
+ xe->XE.SorG.sszB < 0 ? "write" : "read",
+ Word__abs(xe->XE.SorG.sszB) );
+- VG_(pp_ExeContext)( VG_(get_error_where)(err) );
++ VG_(pp_ExeContextAndEpoch)( VG_(get_error_where)(err) );
+
+ emit( " <auxwhat>Address %#lx expected vs actual:</auxwhat>\n",
+ xe->XE.SorG.addr );
+@@ -336,7 +336,7 @@ void pc_pp_Error ( const Error* err )
+ emit( "Invalid %s of size %ld\n",
+ xe->XE.SorG.sszB < 0 ? "write" : "read",
+ Word__abs(xe->XE.SorG.sszB) );
+- VG_(pp_ExeContext)( VG_(get_error_where)(err) );
++ VG_(pp_ExeContextAndEpoch)( VG_(get_error_where)(err) );
+
+ emit( " Address %#lx expected vs actual:\n", xe->XE.SorG.addr );
+ emit( " Expected: %s\n", &xe->XE.SorG.expect[0] );
+@@ -362,7 +362,7 @@ void pc_pp_Error ( const Error* err )
+ emit( " <what>Invalid %s of size %ld</what>\n",
+ readwrite(xe->XE.Heap.sszB),
+ Word__abs(xe->XE.Heap.sszB) );
+- VG_(pp_ExeContext)( VG_(get_error_where)(err) );
++ VG_(pp_ExeContextAndEpoch)( VG_(get_error_where)(err) );
+
+ emit( " <auxwhat>Address %#lx is not derived from "
+ "any known block</auxwhat>\n", a );
+@@ -372,7 +372,7 @@ void pc_pp_Error ( const Error* err )
+ emit( "Invalid %s of size %ld\n",
+ readwrite(xe->XE.Heap.sszB),
+ Word__abs(xe->XE.Heap.sszB) );
+- VG_(pp_ExeContext)( VG_(get_error_where)(err) );
++ VG_(pp_ExeContextAndEpoch)( VG_(get_error_where)(err) );
+
+ emit( " Address %#lx is not derived from "
+ "any known block\n", a );
+@@ -397,7 +397,7 @@ void pc_pp_Error ( const Error* err )
+ how_invalid,
+ readwrite(xe->XE.Heap.sszB),
+ Word__abs(xe->XE.Heap.sszB) );
+- VG_(pp_ExeContext)( VG_(get_error_where)(err) );
++ VG_(pp_ExeContextAndEpoch)( VG_(get_error_where)(err) );
+
+ emit( " <auxwhat>Address %#lx is %lu bytes %s "
+ "the accessing pointer's</auxwhat>\n",
+@@ -406,7 +406,8 @@ void pc_pp_Error ( const Error* err )
+ "a block of size %lu %s</auxwhat>\n",
+ legit, Seg__size(vseg),
+ Seg__is_freed(vseg) ? "free'd" : "alloc'd" );
+- VG_(pp_ExeContext)(Seg__where(vseg));
++ VG_(pp_ExeContextAndEpoch)(
++ VG_(tag_EC_with_current_epoch)(Seg__where(vseg)));
+
+ } else {
+
+@@ -414,14 +415,15 @@ void pc_pp_Error ( const Error* err )
+ how_invalid,
+ readwrite(xe->XE.Heap.sszB),
+ Word__abs(xe->XE.Heap.sszB) );
+- VG_(pp_ExeContext)( VG_(get_error_where)(err) );
++ VG_(pp_ExeContextAndEpoch)( VG_(get_error_where)(err) );
+
+ emit( " Address %#lx is %lu bytes %s the accessing pointer's\n",
+ a, miss_size, place );
+ emit( " %slegitimate range, a block of size %lu %s\n",
+ legit, Seg__size(vseg),
+ Seg__is_freed(vseg) ? "free'd" : "alloc'd" );
+- VG_(pp_ExeContext)(Seg__where(vseg));
++ VG_(pp_ExeContextAndEpoch)(
++ VG_(tag_EC_with_current_epoch)(Seg__where(vseg)));
+
+ }
+ }
+@@ -477,7 +479,7 @@ void pc_pp_Error ( const Error* err )
+
+ emit( " <what>Invalid arguments to %s</what>\n",
+ xe->XE.Arith.opname );
+- VG_(pp_ExeContext)( VG_(get_error_where)(err) );
++ VG_(pp_ExeContextAndEpoch)( VG_(get_error_where)(err) );
+
+ if (seg1 != seg2) {
+ if (NONPTR == seg1) {
+@@ -488,7 +490,8 @@ void pc_pp_Error ( const Error* err )
+ emit( " <auxwhat>First arg derived from address %#lx of "
+ "%lu-byte block alloc'd</auxwhat>\n",
+ Seg__addr(seg1), Seg__size(seg1) );
+- VG_(pp_ExeContext)(Seg__where(seg1));
++ VG_(pp_ExeContextAndEpoch)(
++ VG_(tag_EC_with_current_epoch)(Seg__where(seg1)));
+ }
+ which = "Second arg";
+ } else {
+@@ -500,14 +503,15 @@ void pc_pp_Error ( const Error* err )
+ emit( " <auxwhat>%s derived from address %#lx of "
+ "%lu-byte block alloc'd</auxwhat>\n",
+ which, Seg__addr(seg2), Seg__size(seg2) );
+- VG_(pp_ExeContext)(Seg__where(seg2));
++ VG_(pp_ExeContextAndEpoch)(
++ VG_(tag_EC_with_current_epoch)(Seg__where(seg2)));
+ }
+
+ } else {
+
+ emit( "Invalid arguments to %s\n",
+ xe->XE.Arith.opname );
+- VG_(pp_ExeContext)( VG_(get_error_where)(err) );
++ VG_(pp_ExeContextAndEpoch)( VG_(get_error_where)(err) );
+
+ if (seg1 != seg2) {
+ if (NONPTR == seg1) {
+@@ -518,7 +522,8 @@ void pc_pp_Error ( const Error* err )
+ emit( " First arg derived from address %#lx of "
+ "%lu-byte block alloc'd\n",
+ Seg__addr(seg1), Seg__size(seg1) );
+- VG_(pp_ExeContext)(Seg__where(seg1));
++ VG_(pp_ExeContextAndEpoch)(
++ VG_(tag_EC_with_current_epoch)(Seg__where(seg1)));
+ }
+ which = "Second arg";
+ } else {
+@@ -530,7 +535,8 @@ void pc_pp_Error ( const Error* err )
+ emit( " %s derived from address %#lx of "
+ "%lu-byte block alloc'd\n",
+ which, Seg__addr(seg2), Seg__size(seg2) );
+- VG_(pp_ExeContext)(Seg__where(seg2));
++ VG_(pp_ExeContextAndEpoch)(
++ VG_(tag_EC_with_current_epoch)(Seg__where(seg2)));
+ }
+
+ }
+@@ -562,23 +568,25 @@ void pc_pp_Error ( const Error* err )
+
+ emit( " <what>%s%s contains unaddressable byte(s)</what>\n",
+ what, s );
+- VG_(pp_ExeContext)( VG_(get_error_where)(err) );
++ VG_(pp_ExeContextAndEpoch)( VG_(get_error_where)(err) );
+
+ emit( " <auxwhat>Address %#lx is %lu bytes inside a "
+ "%lu-byte block free'd</auxwhat>\n",
+ lo, lo-Seg__addr(seglo), Seg__size(seglo) );
+- VG_(pp_ExeContext)(Seg__where(seglo));
++ VG_(pp_ExeContextAndEpoch)(
++ VG_(tag_EC_with_current_epoch)(Seg__where(seglo)));
+
+ } else {
+
+ emit( " %s%s contains unaddressable byte(s)\n",
+ what, s );
+- VG_(pp_ExeContext)( VG_(get_error_where)(err) );
++ VG_(pp_ExeContextAndEpoch)( VG_(get_error_where)(err) );
+
+ emit( " Address %#lx is %lu bytes inside a "
+ "%lu-byte block free'd\n",
+ lo, lo-Seg__addr(seglo), Seg__size(seglo) );
+- VG_(pp_ExeContext)(Seg__where(seglo));
++ VG_(pp_ExeContextAndEpoch)(
++ VG_(tag_EC_with_current_epoch)(Seg__where(seglo)));
+
+ }
+
+@@ -589,7 +597,7 @@ void pc_pp_Error ( const Error* err )
+
+ emit( " <what>%s%s is non-contiguous</what>\n",
+ what, s );
+- VG_(pp_ExeContext)( VG_(get_error_where)(err) );
++ VG_(pp_ExeContextAndEpoch)( VG_(get_error_where)(err) );
+
+ if (UNKNOWN == seglo) {
+ emit( " <auxwhat>First byte is "
+@@ -598,7 +606,8 @@ void pc_pp_Error ( const Error* err )
+ emit( " <auxwhat>First byte (%#lx) is %lu bytes inside a "
+ "%lu-byte block alloc'd</auxwhat>\n",
+ lo, lo-Seg__addr(seglo), Seg__size(seglo) );
+- VG_(pp_ExeContext)(Seg__where(seglo));
++ VG_(pp_ExeContextAndEpoch)(
++ VG_(tag_EC_with_current_epoch)(Seg__where(seglo)));
+ }
+
+ if (UNKNOWN == seghi) {
+@@ -608,14 +617,15 @@ void pc_pp_Error ( const Error* err )
+ emit( " <auxwhat>Last byte (%#lx) is %lu bytes inside a "
+ "%lu-byte block alloc'd</auxwhat>\n",
+ hi, hi-Seg__addr(seghi), Seg__size(seghi) );
+- VG_(pp_ExeContext)(Seg__where(seghi));
++ VG_(pp_ExeContextAndEpoch)(
++ VG_(tag_EC_with_current_epoch)(Seg__where(seghi)));
+ }
+
+ } else {
+
+ emit( "%s%s is non-contiguous\n",
+ what, s );
+- VG_(pp_ExeContext)( VG_(get_error_where)(err) );
++ VG_(pp_ExeContextAndEpoch)( VG_(get_error_where)(err) );
+
+ if (UNKNOWN == seglo) {
+ emit( " First byte is not inside a known block\n" );
+@@ -623,7 +633,8 @@ void pc_pp_Error ( const Error* err )
+ emit( " First byte (%#lx) is %lu bytes inside a "
+ "%lu-byte block alloc'd\n",
+ lo, lo-Seg__addr(seglo), Seg__size(seglo) );
+- VG_(pp_ExeContext)(Seg__where(seglo));
++ VG_(pp_ExeContextAndEpoch)(
++ VG_(tag_EC_with_current_epoch)(Seg__where(seglo)));
+ }
+
+ if (UNKNOWN == seghi) {
+@@ -632,7 +643,8 @@ void pc_pp_Error ( const Error* err )
+ emit( " Last byte (%#lx) is %lu bytes inside a "
+ "%lu-byte block alloc'd\n",
+ hi, hi-Seg__addr(seghi), Seg__size(seghi) );
+- VG_(pp_ExeContext)(Seg__where(seghi));
++ VG_(pp_ExeContextAndEpoch)(
++ VG_(tag_EC_with_current_epoch)(Seg__where(seghi)));
+ }
+
+ }
+@@ -650,6 +662,8 @@ void pc_pp_Error ( const Error* err )
+ UInt pc_update_Error_extra ( const Error* err )
+ {
+ XError *xe = (XError*)VG_(get_error_extra)(err);
++ DiEpoch ep = VG_(get_error_where)(err).epoch;
++
+ tl_assert(xe);
+ switch (xe->tag) {
+ case XE_SorG:
+@@ -675,7 +689,7 @@ UInt pc_update_Error_extra ( const Error
+ have_descr
+ = VG_(get_data_description)( xe->XE.Heap.descr1,
+ xe->XE.Heap.descr2,
+- xe->XE.Heap.addr );
++ ep, xe->XE.Heap.addr );
+
+ /* If there's nothing in descr1/2, free it. Why is it safe to
+ to VG_(indexXA) at zero here? Because
+@@ -699,7 +713,7 @@ UInt pc_update_Error_extra ( const Error
+ if (!have_descr) {
+ const HChar *name;
+ if (VG_(get_datasym_and_offset)(
+- xe->XE.Heap.addr, &name,
++ ep, xe->XE.Heap.addr, &name,
+ &xe->XE.Heap.datasymoff )
+ ) {
+ xe->XE.Heap.datasym =
+Index: valgrind-3.13.0/exp-sgcheck/sg_main.c
+===================================================================
+--- valgrind-3.13.0.orig/exp-sgcheck/sg_main.c
++++ valgrind-3.13.0/exp-sgcheck/sg_main.c
+@@ -1936,7 +1936,8 @@ void shadowStack_new_frame ( ThreadId ti
+ const HChar *fnname;
+ Bool ok;
+ Addr ip = ip_post_call_insn;
+- ok = VG_(get_fnname_w_offset)( ip, &fnname );
++ DiEpoch ep = VG_(current_DiEpoch)();
++ ok = VG_(get_fnname_w_offset)( ep, ip, &fnname );
+ while (d > 0) {
+ VG_(printf)(" ");
+ d--;
+Index: valgrind-3.13.0/helgrind/hg_addrdescr.c
+===================================================================
+--- valgrind-3.13.0.orig/helgrind/hg_addrdescr.c
++++ valgrind-3.13.0/helgrind/hg_addrdescr.c
+@@ -45,7 +45,7 @@
+ #include "hg_lock_n_thread.h"
+ #include "hg_addrdescr.h" /* self */
+
+-void HG_(describe_addr) ( Addr a, /*OUT*/AddrInfo* ai )
++void HG_(describe_addr) ( DiEpoch ep, Addr a, /*OUT*/AddrInfo* ai )
+ {
+ tl_assert(ai->tag == Addr_Undescribed);
+
+@@ -75,13 +75,14 @@ void HG_(describe_addr) ( Addr a, /*OUT*
+ ai->Addr.Block.block_desc = "block";
+ ai->Addr.Block.block_szB = hszB;
+ ai->Addr.Block.rwoffset = (Word)(a) - (Word)(haddr);
+- ai->Addr.Block.allocated_at = hctxt;
++ ai->Addr.Block.allocated_at.ec = hctxt;
++ ai->Addr.Block.allocated_at.epoch = ep;
+ VG_(initThreadInfo) (&ai->Addr.Block.alloc_tinfo);
+ ai->Addr.Block.alloc_tinfo.tnr = tnr;
+- ai->Addr.Block.freed_at = VG_(null_ExeContext)();;
++ ai->Addr.Block.freed_at = VG_(null_ExeContextAndEpoch)();
+ } else {
+ /* No block found. Search a non-heap block description. */
+- VG_(describe_addr) (a, ai);
++ VG_(describe_addr) (ep, a, ai);
+
+ /* In case ai contains a tid, set tnr to the corresponding helgrind
+ thread number. */
+@@ -100,14 +101,14 @@ void HG_(describe_addr) ( Addr a, /*OUT*
+ }
+ }
+
+-Bool HG_(get_and_pp_addrdescr) (Addr addr)
++Bool HG_(get_and_pp_addrdescr) (DiEpoch ep, Addr addr)
+ {
+
+ Bool ret;
+ AddrInfo glai;
+
+ glai.tag = Addr_Undescribed;
+- HG_(describe_addr) (addr, &glai);
++ HG_(describe_addr) (ep, addr, &glai);
+ VG_(pp_addrinfo) (addr, &glai);
+ ret = glai.tag != Addr_Unknown;
+
+Index: valgrind-3.13.0/helgrind/hg_addrdescr.h
+===================================================================
+--- valgrind-3.13.0.orig/helgrind/hg_addrdescr.h
++++ valgrind-3.13.0/helgrind/hg_addrdescr.h
+@@ -37,12 +37,12 @@
+ lock description, putting the result in ai.
+ This might allocate some memory in ai, to be cleared with
+ VG_(clear_addrinfo). */
+-extern void HG_(describe_addr) ( Addr a, /*OUT*/AddrInfo* ai );
++extern void HG_(describe_addr) ( DiEpoch ep, Addr a, /*OUT*/AddrInfo* ai );
+
+ /* Get a readable description of addr, then print it using HG_(pp_addrdescr)
+ using xml False and VG_(printf) to emit the characters.
+ Returns True if a description was found/printed, False otherwise. */
+-extern Bool HG_(get_and_pp_addrdescr) (Addr a);
++extern Bool HG_(get_and_pp_addrdescr) (DiEpoch ep, Addr a);
+
+ /* For error creation/address description:
+ map 'data_addr' to a malloc'd chunk, if any.
+Index: valgrind-3.13.0/helgrind/hg_errors.c
+===================================================================
+--- valgrind-3.13.0.orig/helgrind/hg_errors.c
++++ valgrind-3.13.0/helgrind/hg_errors.c
+@@ -421,7 +421,8 @@ UInt HG_(update_extra) ( const Error* er
+ VG_(printf)("HG_(update_extra): "
+ "%d conflicting-event queries\n", xxx);
+
+- HG_(describe_addr) (xe->XE.Race.data_addr, &xe->XE.Race.data_addrinfo);
++ HG_(describe_addr) (VG_(get_error_where)(err).epoch,
++ xe->XE.Race.data_addr, &xe->XE.Race.data_addrinfo);
+
+ /* And poke around in the conflicting-event map, to see if we
+ can rustle up a plausible-looking conflicting memory access
+@@ -748,7 +749,8 @@ static Bool announce_one_thread ( Thread
+ VG_(printf_xml)(" <isrootthread></isrootthread>\n");
+ } else {
+ tl_assert(thr->created_at != NULL);
+- VG_(pp_ExeContext)( thr->created_at );
++ VG_(pp_ExeContextAndEpoch)(
++ VG_(tag_EC_with_current_epoch)( thr->created_at ) );
+ }
+ VG_(printf_xml)("</announcethread>\n\n");
+
+@@ -767,7 +769,8 @@ static Bool announce_one_thread ( Thread
+ tl_assert(thr->created_at != NULL);
+ VG_(message)(Vg_UserMsg, "Thread #%d was created\n",
+ thr->errmsg_index);
+- VG_(pp_ExeContext)( thr->created_at );
++ VG_(pp_ExeContextAndEpoch)(
++ VG_(tag_EC_with_current_epoch)( thr->created_at ) );
+ }
+ VG_(message)(Vg_UserMsg, "\n");
+
+@@ -789,19 +792,21 @@ static void announce_LockP ( Lock* lk )
+ if (lk->appeared_at) {
+ emit( " <auxwhat>Lock at %p was first observed</auxwhat>\n",
+ (void*)lk );
+- VG_(pp_ExeContext)( lk->appeared_at );
++ VG_(pp_ExeContextAndEpoch)(
++ VG_(tag_EC_with_current_epoch)( lk->appeared_at ) );
+ }
+
+ } else {
+ if (lk->appeared_at) {
+ VG_(umsg)( " Lock at %p was first observed\n",
+ (void*)lk->guestaddr );
+- VG_(pp_ExeContext)( lk->appeared_at );
++ VG_(pp_ExeContextAndEpoch)(
++ VG_(tag_EC_with_current_epoch)( lk->appeared_at ) );
+ } else {
+ VG_(umsg)( " Lock at %p : no stacktrace for first observation\n",
+ (void*)lk->guestaddr );
+ }
+- HG_(get_and_pp_addrdescr) (lk->guestaddr);
++ HG_(get_and_pp_addrdescr) (VG_(current_DiEpoch)(), lk->guestaddr);
+ VG_(umsg)("\n");
+ }
+ }
+@@ -941,11 +946,12 @@ void HG_(pp_Error) ( const Error* err )
+ emit( " <hthreadid>%d</hthreadid>\n",
+ (Int)xe->XE.Misc.thr->errmsg_index );
+ emit( " </xwhat>\n" );
+- VG_(pp_ExeContext)( VG_(get_error_where)(err) );
++ VG_(pp_ExeContextAndEpoch)( VG_(get_error_where)(err) );
+ if (xe->XE.Misc.auxstr) {
+ emit(" <auxwhat>%s</auxwhat>\n", xe->XE.Misc.auxstr);
+ if (xe->XE.Misc.auxctx)
+- VG_(pp_ExeContext)( xe->XE.Misc.auxctx );
++ VG_(pp_ExeContextAndEpoch)(
++ VG_(tag_EC_with_current_epoch)( xe->XE.Misc.auxctx ));
+ }
+
+ } else {
+@@ -953,11 +959,12 @@ void HG_(pp_Error) ( const Error* err )
+ emit( "Thread #%d: %s\n",
+ (Int)xe->XE.Misc.thr->errmsg_index,
+ xe->XE.Misc.errstr );
+- VG_(pp_ExeContext)( VG_(get_error_where)(err) );
++ VG_(pp_ExeContextAndEpoch)( VG_(get_error_where)(err) );
+ if (xe->XE.Misc.auxstr) {
+ emit(" %s\n", xe->XE.Misc.auxstr);
+ if (xe->XE.Misc.auxctx)
+- VG_(pp_ExeContext)( xe->XE.Misc.auxctx );
++ VG_(pp_ExeContextAndEpoch)(
++ VG_(tag_EC_with_current_epoch)( xe->XE.Misc.auxctx ));
+ }
+
+ }
+@@ -978,17 +985,21 @@ void HG_(pp_Error) ( const Error* err )
+ emit( " <hthreadid>%d</hthreadid>\n",
+ (Int)xe->XE.LockOrder.thr->errmsg_index );
+ emit( " </xwhat>\n" );
+- VG_(pp_ExeContext)( VG_(get_error_where)(err) );
++ VG_(pp_ExeContextAndEpoch)( VG_(get_error_where)(err) );
+ if (xe->XE.LockOrder.shouldbe_earlier_ec
+ && xe->XE.LockOrder.shouldbe_later_ec) {
+ emit( " <auxwhat>Required order was established by "
+ "acquisition of lock at %p</auxwhat>\n",
+ (void*)xe->XE.LockOrder.shouldbe_earlier_lk->guestaddr );
+- VG_(pp_ExeContext)( xe->XE.LockOrder.shouldbe_earlier_ec );
++ VG_(pp_ExeContextAndEpoch)(
++ VG_(tag_EC_with_current_epoch)(
++ xe->XE.LockOrder.shouldbe_earlier_ec ));
+ emit( " <auxwhat>followed by a later acquisition "
+ "of lock at %p</auxwhat>\n",
+ (void*)xe->XE.LockOrder.shouldbe_later_lk->guestaddr );
+- VG_(pp_ExeContext)( xe->XE.LockOrder.shouldbe_later_ec );
++ VG_(pp_ExeContextAndEpoch)(
++ VG_(tag_EC_with_current_epoch)(
++ xe->XE.LockOrder.shouldbe_later_ec ));
+ }
+ announce_LockP ( xe->XE.LockOrder.shouldbe_earlier_lk );
+ announce_LockP ( xe->XE.LockOrder.shouldbe_later_lk );
+@@ -1004,25 +1015,31 @@ void HG_(pp_Error) ( const Error* err )
+ "acquisition of lock at %p\n",
+ (void*)xe->XE.LockOrder.shouldbe_later_lk->guestaddr);
+ if (xe->XE.LockOrder.actual_earlier_ec) {
+- VG_(pp_ExeContext)(xe->XE.LockOrder.actual_earlier_ec);
++ VG_(pp_ExeContextAndEpoch)(
++ VG_(tag_EC_with_current_epoch)(
++ xe->XE.LockOrder.actual_earlier_ec));
+ } else {
+ emit(" (stack unavailable)\n");
+ }
+ emit( "\n" );
+ emit(" followed by a later acquisition of lock at %p\n",
+ (void*)xe->XE.LockOrder.shouldbe_earlier_lk->guestaddr);
+- VG_(pp_ExeContext)( VG_(get_error_where)(err) );
++ VG_(pp_ExeContextAndEpoch)( VG_(get_error_where)(err) );
+ if (xe->XE.LockOrder.shouldbe_earlier_ec
+ && xe->XE.LockOrder.shouldbe_later_ec) {
+ emit("\n");
+ emit( "Required order was established by "
+ "acquisition of lock at %p\n",
+ (void*)xe->XE.LockOrder.shouldbe_earlier_lk->guestaddr );
+- VG_(pp_ExeContext)( xe->XE.LockOrder.shouldbe_earlier_ec );
++ VG_(pp_ExeContextAndEpoch)(
++ VG_(tag_EC_with_current_epoch)(
++ xe->XE.LockOrder.shouldbe_earlier_ec ));
+ emit( "\n" );
+ emit( " followed by a later acquisition of lock at %p\n",
+ (void*)xe->XE.LockOrder.shouldbe_later_lk->guestaddr );
+- VG_(pp_ExeContext)( xe->XE.LockOrder.shouldbe_later_ec );
++ VG_(pp_ExeContextAndEpoch)(
++ VG_(tag_EC_with_current_epoch)(
++ xe->XE.LockOrder.shouldbe_later_ec ));
+ }
+ emit("\n");
+ announce_LockP ( xe->XE.LockOrder.shouldbe_earlier_lk );
+@@ -1048,7 +1065,7 @@ void HG_(pp_Error) ( const Error* err )
+ emit( " </xwhat>\n" );
+ emit( " <what>with error code %ld (%s)</what>\n",
+ xe->XE.PthAPIerror.err, xe->XE.PthAPIerror.errstr );
+- VG_(pp_ExeContext)( VG_(get_error_where)(err) );
++ VG_(pp_ExeContextAndEpoch)( VG_(get_error_where)(err) );
+
+ } else {
+
+@@ -1057,7 +1074,7 @@ void HG_(pp_Error) ( const Error* err )
+ xe->XE.PthAPIerror.fnname );
+ emit( " with error code %ld (%s)\n",
+ xe->XE.PthAPIerror.err, xe->XE.PthAPIerror.errstr );
+- VG_(pp_ExeContext)( VG_(get_error_where)(err) );
++ VG_(pp_ExeContextAndEpoch)( VG_(get_error_where)(err) );
+
+ }
+
+@@ -1077,14 +1094,14 @@ void HG_(pp_Error) ( const Error* err )
+ emit( " <hthreadid>%d</hthreadid>\n",
+ (Int)xe->XE.UnlockBogus.thr->errmsg_index );
+ emit( " </xwhat>\n" );
+- VG_(pp_ExeContext)( VG_(get_error_where)(err) );
++ VG_(pp_ExeContextAndEpoch)( VG_(get_error_where)(err) );
+
+ } else {
+
+ emit( "Thread #%d unlocked an invalid lock at %p\n",
+ (Int)xe->XE.UnlockBogus.thr->errmsg_index,
+ (void*)xe->XE.UnlockBogus.lock_ga );
+- VG_(pp_ExeContext)( VG_(get_error_where)(err) );
++ VG_(pp_ExeContextAndEpoch)( VG_(get_error_where)(err) );
+
+ }
+
+@@ -1109,7 +1126,7 @@ void HG_(pp_Error) ( const Error* err )
+ emit( " <hthreadid>%d</hthreadid>\n",
+ (Int)xe->XE.UnlockForeign.owner->errmsg_index );
+ emit( " </xwhat>\n" );
+- VG_(pp_ExeContext)( VG_(get_error_where)(err) );
++ VG_(pp_ExeContextAndEpoch)( VG_(get_error_where)(err) );
+ announce_LockP ( xe->XE.UnlockForeign.lock );
+
+ } else {
+@@ -1119,7 +1136,7 @@ void HG_(pp_Error) ( const Error* err )
+ (Int)xe->XE.UnlockForeign.thr->errmsg_index,
+ (void*)xe->XE.UnlockForeign.lock->guestaddr,
+ (Int)xe->XE.UnlockForeign.owner->errmsg_index );
+- VG_(pp_ExeContext)( VG_(get_error_where)(err) );
++ VG_(pp_ExeContextAndEpoch)( VG_(get_error_where)(err) );
+ announce_LockP ( xe->XE.UnlockForeign.lock );
+
+ }
+@@ -1141,7 +1158,7 @@ void HG_(pp_Error) ( const Error* err )
+ emit( " <hthreadid>%d</hthreadid>\n",
+ (Int)xe->XE.UnlockUnlocked.thr->errmsg_index );
+ emit( " </xwhat>\n" );
+- VG_(pp_ExeContext)( VG_(get_error_where)(err) );
++ VG_(pp_ExeContextAndEpoch)( VG_(get_error_where)(err) );
+ announce_LockP ( xe->XE.UnlockUnlocked.lock);
+
+ } else {
+@@ -1149,7 +1166,7 @@ void HG_(pp_Error) ( const Error* err )
+ emit( "Thread #%d unlocked a not-locked lock at %p\n",
+ (Int)xe->XE.UnlockUnlocked.thr->errmsg_index,
+ (void*)xe->XE.UnlockUnlocked.lock->guestaddr );
+- VG_(pp_ExeContext)( VG_(get_error_where)(err) );
++ VG_(pp_ExeContextAndEpoch)( VG_(get_error_where)(err) );
+ announce_LockP ( xe->XE.UnlockUnlocked.lock);
+
+ }
+@@ -1179,7 +1196,7 @@ void HG_(pp_Error) ( const Error* err )
+ emit( " <hthreadid>%d</hthreadid>\n",
+ (Int)xe->XE.Race.thr->errmsg_index );
+ emit( " </xwhat>\n" );
+- VG_(pp_ExeContext)( VG_(get_error_where)(err) );
++ VG_(pp_ExeContextAndEpoch)( VG_(get_error_where)(err) );
+
+ if (xe->XE.Race.h2_ct) {
+ tl_assert(xe->XE.Race.h2_ct_accEC); // assured by update_extra
+@@ -1192,7 +1209,8 @@ void HG_(pp_Error) ( const Error* err )
+ emit( " <hthreadid>%d</hthreadid>\n",
+ xe->XE.Race.h2_ct->errmsg_index);
+ emit(" </xauxwhat>\n");
+- VG_(pp_ExeContext)( xe->XE.Race.h2_ct_accEC );
++ VG_(pp_ExeContextAndEpoch)(
++ VG_(tag_EC_with_current_epoch)( xe->XE.Race.h2_ct_accEC ));
+ }
+
+ if (xe->XE.Race.h1_ct) {
+@@ -1204,13 +1222,17 @@ void HG_(pp_Error) ( const Error* err )
+ xe->XE.Race.h1_ct->errmsg_index );
+ emit(" </xauxwhat>\n");
+ if (xe->XE.Race.h1_ct_mbsegstartEC) {
+- VG_(pp_ExeContext)( xe->XE.Race.h1_ct_mbsegstartEC );
++ VG_(pp_ExeContextAndEpoch)(
++ VG_(tag_EC_with_current_epoch)(
++ xe->XE.Race.h1_ct_mbsegstartEC ));
+ } else {
+ emit( " <auxwhat>(the start of the thread)</auxwhat>\n" );
+ }
+ emit( " <auxwhat>but before</auxwhat>\n" );
+ if (xe->XE.Race.h1_ct_mbsegendEC) {
+- VG_(pp_ExeContext)( xe->XE.Race.h1_ct_mbsegendEC );
++ VG_(pp_ExeContextAndEpoch)(
++ VG_(tag_EC_with_current_epoch)(
++ xe->XE.Race.h1_ct_mbsegendEC ));
+ } else {
+ emit( " <auxwhat>(the end of the thread)</auxwhat>\n" );
+ }
+@@ -1228,7 +1250,7 @@ void HG_(pp_Error) ( const Error* err )
+
+ tl_assert(xe->XE.Race.locksHeldW);
+ show_LockP_summary_textmode( xe->XE.Race.locksHeldW, "" );
+- VG_(pp_ExeContext)( VG_(get_error_where)(err) );
++ VG_(pp_ExeContextAndEpoch)( VG_(get_error_where)(err) );
+
+ if (xe->XE.Race.h2_ct) {
+ tl_assert(xe->XE.Race.h2_ct_accEC); // assured by update_extra
+@@ -1240,7 +1262,8 @@ void HG_(pp_Error) ( const Error* err )
+ xe->XE.Race.h2_ct_accSzB,
+ xe->XE.Race.h2_ct->errmsg_index );
+ show_LockP_summary_textmode( xe->XE.Race.h2_ct_locksHeldW, "" );
+- VG_(pp_ExeContext)( xe->XE.Race.h2_ct_accEC );
++ VG_(pp_ExeContextAndEpoch)(
++ VG_(tag_EC_with_current_epoch)( xe->XE.Race.h2_ct_accEC ));
+ }
+
+ if (xe->XE.Race.h1_ct) {
+@@ -1248,13 +1271,17 @@ void HG_(pp_Error) ( const Error* err )
+ "after\n",
+ xe->XE.Race.h1_ct->errmsg_index );
+ if (xe->XE.Race.h1_ct_mbsegstartEC) {
+- VG_(pp_ExeContext)( xe->XE.Race.h1_ct_mbsegstartEC );
++ VG_(pp_ExeContextAndEpoch)(
++ VG_(tag_EC_with_current_epoch)(
++ xe->XE.Race.h1_ct_mbsegstartEC ));
+ } else {
+ emit( " (the start of the thread)\n" );
+ }
+ emit( " but before\n" );
+ if (xe->XE.Race.h1_ct_mbsegendEC) {
+- VG_(pp_ExeContext)( xe->XE.Race.h1_ct_mbsegendEC );
++ VG_(pp_ExeContextAndEpoch)(
++ VG_(tag_EC_with_current_epoch)(
++ xe->XE.Race.h1_ct_mbsegendEC ));
+ } else {
+ emit( " (the end of the thread)\n" );
+ }
+@@ -1307,7 +1334,7 @@ void HG_(print_access) (StackTrace ips,
+ show_LockP_summary_textmode( locksHeldW_P, "" );
+ HG_(free) (locksHeldW_P);
+ }
+- VG_(pp_StackTrace) (ips, n_ips);
++ VG_(pp_StackTrace)( VG_(current_DiEpoch)(), ips, n_ips );
+ VG_(printf) ("\n");
+ }
+
+Index: valgrind-3.13.0/helgrind/hg_main.c
+===================================================================
+--- valgrind-3.13.0.orig/helgrind/hg_main.c
++++ valgrind-3.13.0/helgrind/hg_main.c
+@@ -483,13 +483,14 @@ static void pp_Lock ( Int d, Lock* lk,
+ Bool show_lock_addrdescr,
+ Bool show_internal_data)
+ {
++ DiEpoch ep = VG_(current_DiEpoch)();
+ space(d+0);
+ if (show_internal_data)
+ VG_(printf)("Lock %p (ga %#lx) {\n", lk, lk->guestaddr);
+ else
+ VG_(printf)("Lock ga %#lx {\n", lk->guestaddr);
+ if (!show_lock_addrdescr
+- || !HG_(get_and_pp_addrdescr) ((Addr) lk->guestaddr))
++ || !HG_(get_and_pp_addrdescr) (ep, (Addr) lk->guestaddr))
+ VG_(printf)("\n");
+
+ if (sHOW_ADMIN) {
+@@ -4598,7 +4599,7 @@ static Bool is_in_dynamic_linker_shared_
+ DebugInfo* dinfo;
+ const HChar* soname;
+
+- dinfo = VG_(find_DebugInfo)( ga );
++ dinfo = VG_(find_DebugInfo)( VG_(current_DiEpoch)(), ga );
+ if (!dinfo) return False;
+
+ soname = VG_(DebugInfo_get_soname)(dinfo);
+@@ -5817,9 +5818,9 @@ static void hg_post_clo_init ( void )
+ VG_(XTMemory_Full_init)(VG_(XT_filter_1top_and_maybe_below_main));
+ }
+
+-static void hg_info_location (Addr a)
++static void hg_info_location (DiEpoch ep, Addr a)
+ {
+- (void) HG_(get_and_pp_addrdescr) (a);
++ (void) HG_(get_and_pp_addrdescr) (ep, a);
+ }
+
+ static void hg_pre_clo_init ( void )
+Index: valgrind-3.13.0/helgrind/libhb_core.c
+===================================================================
+--- valgrind-3.13.0.orig/helgrind/libhb_core.c
++++ valgrind-3.13.0/helgrind/libhb_core.c
+@@ -4095,7 +4095,7 @@ static void note_local_Kw_n_stack_for (
+ VG_(printf)("LOCAL Kw: thr %p, Kw %llu, ec %p\n",
+ thr, pair.ull, pair.ec );
+ if (0)
+- VG_(pp_ExeContext)(pair.ec);
++ VG_(pp_ExeContextAndEpoch)(VG_(tag_EC_with_current_epoch)(pair.ec));
+ }
+
+ static Int cmp__ULong_n_EC__by_ULong ( const ULong_n_EC* pair1,
+Index: valgrind-3.13.0/include/pub_tool_addrinfo.h
+===================================================================
+--- valgrind-3.13.0.orig/include/pub_tool_addrinfo.h
++++ valgrind-3.13.0/include/pub_tool_addrinfo.h
+@@ -135,6 +135,7 @@ struct _AddrInfo {
+ // (spoffset will be negative, as stacks are assumed growing down).
+ struct {
+ ThreadInfo tinfo;
++ DiEpoch epoch;
+ Addr IP;
+ Int frameNo;
+ StackPos stackPos;
+@@ -151,9 +152,9 @@ struct _AddrInfo {
+ const HChar* block_desc; // "block","mempool","user-defined",arena
+ SizeT block_szB;
+ PtrdiffT rwoffset;
+- ExeContext* allocated_at; // might be null_ExeContext.
+- ThreadInfo alloc_tinfo; // which thread did alloc this block.
+- ExeContext* freed_at; // might be null_ExeContext.
++ ExeContextAndEpoch allocated_at; // might contain null_ExeContext.
++ ThreadInfo alloc_tinfo; // which thread alloc'd this block.
++ ExeContextAndEpoch freed_at; // might contain null_ExeContext.
+ } Block;
+
+ // In a global .data symbol. This holds
+@@ -204,7 +205,7 @@ struct _AddrInfo {
+ On entry, ai->tag must be equal to Addr_Undescribed.
+ This might allocate some memory, that can be cleared with
+ VG_(clear_addrinfo). */
+-extern void VG_(describe_addr) ( Addr a, /*OUT*/AddrInfo* ai );
++extern void VG_(describe_addr) ( DiEpoch ep, Addr a, /*OUT*/AddrInfo* ai );
+
+ extern void VG_(clear_addrinfo) ( AddrInfo* ai);
+
+Index: valgrind-3.13.0/include/pub_tool_basics.h
+===================================================================
+--- valgrind-3.13.0.orig/include/pub_tool_basics.h
++++ valgrind-3.13.0/include/pub_tool_basics.h
+@@ -129,6 +129,24 @@ typedef struct { UWord uw1; UWord uw2;
+ /* ThreadIds are simply indices into the VG_(threads)[] array. */
+ typedef UInt ThreadId;
+
++
++/* You need a debuginfo epoch in order to convert an address into any source
++ level entity, since that conversion depends on what objects were mapped
++ in at the time. An epoch is simply a monotonically increasing counter,
++ which we wrap up in a struct so as to enable the C type system to
++ distinguish it from other kinds of numbers. m_debuginfo holds and
++ maintains the current epoch number. */
++typedef struct { UInt n; } DiEpoch;
++
++static inline DiEpoch DiEpoch_INVALID ( void ) {
++ DiEpoch dep; dep.n = 0; return dep;
++}
++
++static inline Bool is_DiEpoch_INVALID ( DiEpoch dep ) {
++ return dep.n == 0;
++}
++
++
+ /* Many data structures need to allocate and release memory.
+ The allocation/release functions must be provided by the caller.
+ The Alloc_Fn_t function must allocate a chunk of memory of size szB.
+Index: valgrind-3.13.0/include/pub_tool_debuginfo.h
+===================================================================
+--- valgrind-3.13.0.orig/include/pub_tool_debuginfo.h
++++ valgrind-3.13.0/include/pub_tool_debuginfo.h
+@@ -31,11 +31,20 @@
+ #ifndef __PUB_TOOL_DEBUGINFO_H
+ #define __PUB_TOOL_DEBUGINFO_H
+
+-#include "pub_tool_basics.h" // VG_ macro
++#include "pub_tool_basics.h" // VG_ macro, DiEpoch
+ #include "pub_tool_xarray.h" // XArray
+
++
+ /*====================================================================*/
+-/*=== Obtaining debug information ===*/
++/*=== Debuginfo epochs. ===*/
++/*====================================================================*/
++
++// This returns the current epoch.
++DiEpoch VG_(current_DiEpoch)(void);
++
++
++/*====================================================================*/
++/*=== Obtaining information pertaining to source artefacts. ===*/
+ /*====================================================================*/
+
+ /* IMPORTANT COMMENT about memory persistence and ownership.
+@@ -76,11 +85,11 @@
+ demangles C++ function names. VG_(get_fnname_w_offset) is the
+ same, except it appends "+N" to symbol names to indicate offsets.
+ NOTE: See IMPORTANT COMMENT above about persistence and ownership. */
+-extern Bool VG_(get_filename) ( Addr a, const HChar** filename );
+-extern Bool VG_(get_fnname) ( Addr a, const HChar** fnname );
+-extern Bool VG_(get_linenum) ( Addr a, UInt* linenum );
++extern Bool VG_(get_filename) ( DiEpoch ep, Addr a, const HChar** filename );
++extern Bool VG_(get_fnname) ( DiEpoch ep, Addr a, const HChar** fnname );
++extern Bool VG_(get_linenum) ( DiEpoch ep, Addr a, UInt* linenum );
+ extern Bool VG_(get_fnname_w_offset)
+- ( Addr a, const HChar** fnname );
++ ( DiEpoch ep, Addr a, const HChar** fnname );
+
+ /* This one is the most general. It gives filename, line number and
+ optionally directory name. filename and linenum may not be NULL.
+@@ -95,7 +104,7 @@ extern Bool VG_(get_fnname_w_offset)
+ Returned value indicates whether any filename/line info could be
+ found. */
+ extern Bool VG_(get_filename_linenum)
+- ( Addr a,
++ ( DiEpoch ep, Addr a,
+ /*OUT*/const HChar** filename,
+ /*OUT*/const HChar** dirname,
+ /*OUT*/UInt* linenum );
+@@ -108,7 +117,8 @@ extern Bool VG_(get_filename_linenum)
+ of its symbols, this function will not be able to recognise function
+ entry points within it.
+ NOTE: See IMPORTANT COMMENT above about persistence and ownership. */
+-extern Bool VG_(get_fnname_if_entry) ( Addr a, const HChar** fnname );
++extern Bool VG_(get_fnname_if_entry) ( DiEpoch ep, Addr a,
++ const HChar** fnname );
+
+ typedef
+ enum {
+@@ -121,13 +131,13 @@ typedef
+ extern Vg_FnNameKind VG_(get_fnname_kind) ( const HChar* name );
+
+ /* Like VG_(get_fnname_kind), but takes a code address. */
+-extern Vg_FnNameKind VG_(get_fnname_kind_from_IP) ( Addr ip );
++extern Vg_FnNameKind VG_(get_fnname_kind_from_IP) ( DiEpoch ep, Addr ip );
+
+ /* Looks up data_addr in the collection of data symbols, and if found
+ puts its name (or as much as will fit) into dname[0 .. n_dname-1],
+ which is guaranteed to be zero terminated. Also data_addr's offset
+ from the symbol start is put into *offset. */
+-extern Bool VG_(get_datasym_and_offset)( Addr data_addr,
++extern Bool VG_(get_datasym_and_offset)( DiEpoch ep, Addr data_addr,
+ /*OUT*/const HChar** dname,
+ /*OUT*/PtrdiffT* offset );
+
+@@ -147,14 +157,14 @@ extern Bool VG_(get_datasym_and_offset)(
+ Bool VG_(get_data_description)(
+ /*MOD*/ XArray* /* of HChar */ dname1v,
+ /*MOD*/ XArray* /* of HChar */ dname2v,
+- Addr data_addr
++ DiEpoch ep, Addr data_addr
+ );
+
+ /* Succeeds if the address is within a shared object or the main executable.
+ It first searches if Addr a belongs to the text segment of debug info.
+ If not found, it asks the address space manager whether it
+ knows the name of the file associated with this mapping. */
+-extern Bool VG_(get_objname) ( Addr a, const HChar** objname );
++extern Bool VG_(get_objname) ( DiEpoch ep, Addr a, const HChar** objname );
+
+
+ /* Cursor allowing to describe inlined function calls at an IP,
+@@ -169,7 +179,7 @@ typedef struct _InlIPCursor InlIPCursor
+ eip can possibly corresponds to inlined function call(s).
+ To describe eip and the inlined function calls, the following must
+ be done:
+- InlIPCursor *iipc = VG_(new_IIPC)(eip);
++ InlIPCursor *iipc = VG_(new_IIPC)(ep, eip);
+ do {
+ buf = VG_(describe_IP)(eip, iipc);
+ ... use buf ...
+@@ -182,12 +192,16 @@ typedef struct _InlIPCursor InlIPCursor
+ Note, that the returned string is allocated in a static buffer local to
+ VG_(describe_IP). That buffer will be overwritten with every invocation.
+ Therefore, callers need to possibly stash away the string.
++
++ Since this maps a code location to a source artefact (function names),
++ new_IIPC requires a DiEpoch argument (ep) too.
+ */
+-extern const HChar* VG_(describe_IP)(Addr eip, const InlIPCursor* iipc);
++extern const HChar* VG_(describe_IP)(DiEpoch ep, Addr eip,
++ const InlIPCursor* iipc);
+
+ /* Builds a IIPC (Inlined IP Cursor) to describe eip and all the inlined calls
+ at eip. Such a cursor must be deleted after use using VG_(delete_IIPC). */
+-extern InlIPCursor* VG_(new_IIPC)(Addr eip);
++extern InlIPCursor* VG_(new_IIPC)(DiEpoch ep, Addr eip);
+ /* Move the cursor to the next call to describe.
+ Returns True if there are still calls to describe.
+ False if nothing to describe anymore. */
+@@ -239,7 +253,7 @@ VG_(di_get_global_blocks_from_dihandle)
+
+
+ /*====================================================================*/
+-/*=== Obtaining debug information ===*/
++/*=== Obtaining information pertaining to shared objects. ===*/
+ /*====================================================================*/
+
+ /* A way to make limited debuginfo queries on a per-mapped-object
+@@ -248,7 +262,7 @@ typedef struct _DebugInfo DebugInfo;
+
+ /* Returns NULL if the DebugInfo isn't found. It doesn't matter if
+ debug info is present or not. */
+-DebugInfo* VG_(find_DebugInfo) ( Addr a );
++DebugInfo* VG_(find_DebugInfo) ( DiEpoch ep, Addr a );
+
+ /* Fish bits out of DebugInfos. */
+ Addr VG_(DebugInfo_get_text_avma) ( const DebugInfo *di );
+Index: valgrind-3.13.0/include/pub_tool_errormgr.h
+===================================================================
+--- valgrind-3.13.0.orig/include/pub_tool_errormgr.h
++++ valgrind-3.13.0/include/pub_tool_errormgr.h
+@@ -56,11 +56,11 @@ typedef
+
+ /* Useful in VG_(tdict).tool_error_matches_suppression(),
+ * VG_(tdict).tool_pp_Error(), etc */
+-ExeContext* VG_(get_error_where) ( const Error* err );
+-ErrorKind VG_(get_error_kind) ( const Error* err );
+-Addr VG_(get_error_address) ( const Error* err );
+-const HChar* VG_(get_error_string) ( const Error* err );
+-void* VG_(get_error_extra) ( const Error* err );
++ExeContextAndEpoch VG_(get_error_where) ( const Error* err );
++ErrorKind VG_(get_error_kind) ( const Error* err );
++Addr VG_(get_error_address) ( const Error* err );
++const HChar* VG_(get_error_string) ( const Error* err );
++void* VG_(get_error_extra) ( const Error* err );
+
+ /* Call this when an error occurs. It will be recorded if it hasn't been
+ seen before. If it has, the existing error record will have its count
+@@ -90,7 +90,7 @@ extern void VG_(maybe_record_error) ( Th
+ whether to add the error in the error total count (another mild hack). */
+ extern Bool VG_(unique_error) ( ThreadId tid, ErrorKind ekind,
+ Addr a, const HChar* s, void* extra,
+- ExeContext* where, Bool print_error,
++ ExeContextAndEpoch where, Bool print_error,
+ Bool allow_GDB_attach, Bool count_error );
+
+ /* Gets from fd (an opened suppression file) a non-blank, non-comment
+Index: valgrind-3.13.0/include/pub_tool_execontext.h
+===================================================================
+--- valgrind-3.13.0.orig/include/pub_tool_execontext.h
++++ valgrind-3.13.0/include/pub_tool_execontext.h
+@@ -30,7 +30,13 @@
+ #ifndef __PUB_TOOL_EXECONTEXT_H
+ #define __PUB_TOOL_EXECONTEXT_H
+
+-#include "pub_tool_basics.h" // ThreadID
++#include "pub_tool_basics.h" // ThreadID
++#include "pub_tool_debuginfo.h" // DiEpoch
++
++
++/*====================================================================*/
++/*=== ExeContext ===*/
++/*====================================================================*/
+
+ // It's an abstract type.
+ typedef
+@@ -84,9 +90,6 @@ extern void VG_(apply_ExeContext)( void(
+ extern Bool VG_(eq_ExeContext) ( VgRes res, const ExeContext* e1,
+ const ExeContext* e2 );
+
+-// Print an ExeContext.
+-extern void VG_(pp_ExeContext) ( ExeContext* ec );
+-
+ // Get the 32-bit unique reference number for this ExeContext
+ // (the "ExeContext Unique"). Guaranteed to be nonzero and to be a
+ // multiple of four (iow, the lowest two bits are guaranteed to
+@@ -113,10 +116,52 @@ static inline Bool VG_(is_plausible_ECU)
+ // Make an ExeContext containing exactly the specified stack frames.
+ ExeContext* VG_(make_ExeContext_from_StackTrace)( const Addr* ips, UInt n_ips );
+
+-// Returns the "null" exe context. The null execontext is an artificial
+-// exe context, with a stack trace made of one Addr (the NULL address).
+-extern
+-ExeContext* VG_(null_ExeContext) (void);
++
++/*====================================================================*/
++/*=== ExeContextAndEpoch ===*/
++/*====================================================================*/
++
++/* A plain ExeContext is not generally symbolisable, since we also need to
++ know which DebugInfo epoch it pertains to. ExeContextAndEpoch pairs them
++ up. Note this is just two words, so passing it around by value is
++ fine. */
++typedef
++ struct {
++ ExeContext* ec;
++ DiEpoch epoch;
++ }
++ ExeContextAndEpoch;
++
++// A trivial constructor.
++static inline ExeContextAndEpoch mk_ExeContextAndEpoch ( ExeContext* ec,
++ DiEpoch ep ) {
++ ExeContextAndEpoch ece;
++ ece.ec = ec;
++ ece.epoch = ep;
++ return ece;
++}
++
++// Generates a completely invalid ExeContextAndEpoch, with NULL for .ec and
++// zero for .epoch. Both values are invalid.
++ExeContextAndEpoch VG_(invalid_ExeContextAndEpoch) ( void );
++
++// Takes an ExeContext and tags it with the current epoch, which is
++// generally what we want to do.
++ExeContextAndEpoch VG_(tag_EC_with_current_epoch)( ExeContext* ec );
++
++// Print an ExeContextAndEpoch. We can't print a plain ExeContext
++// because we can't symbolising it without knowing which debuginfo
++// epoch it pertains to.
++void VG_(pp_ExeContextAndEpoch) ( ExeContextAndEpoch ece );
++
++// Returns the "null" exe context tagged with the current debuginfo
++// epoch. The null execontext is an artificial exe context, with a stack
++// trace made of one Addr (the NULL address), and the current epoch.
++ExeContextAndEpoch VG_(null_ExeContextAndEpoch) ( void );
++
++// Is this a value obtained from VG_(null_ExeContextAndEpoch) ?
++Bool VG_(is_null_ExeContextAndEpoch)( ExeContextAndEpoch ece );
++
+
+ #endif // __PUB_TOOL_EXECONTEXT_H
+
+Index: valgrind-3.13.0/include/pub_tool_options.h
+===================================================================
+--- valgrind-3.13.0.orig/include/pub_tool_options.h
++++ valgrind-3.13.0/include/pub_tool_options.h
+@@ -249,6 +249,12 @@ extern Int VG_(clo_backtrace_size);
+ /* Continue stack traces below main()? Default: NO */
+ extern Bool VG_(clo_show_below_main);
+
++/* Keep symbols (and all other debuginfo) for code that is unloaded (dlclose
++ or similar) so that stack traces can still give line/file info for
++ previously captured stack traces. e.g. ... showing where a block was
++ allocated e.g. leaks of or accesses just outside a block. */
++extern Bool VG_(clo_keep_debuginfo);
++
+
+ /* Used to expand file names. "option_name" is the option name, eg.
+ "--log-file". 'format' is what follows, eg. "cachegrind.out.%p". In
+Index: valgrind-3.13.0/include/pub_tool_stacktrace.h
+===================================================================
+--- valgrind-3.13.0.orig/include/pub_tool_stacktrace.h
++++ valgrind-3.13.0/include/pub_tool_stacktrace.h
+@@ -31,7 +31,7 @@
+ #ifndef __PUB_TOOL_STACKTRACE_H
+ #define __PUB_TOOL_STACKTRACE_H
+
+-#include "pub_tool_basics.h" // Addr
++#include "pub_tool_basics.h" // Addr, DiEpoch
+
+ // The basic stack trace type: just an array of code addresses.
+ typedef Addr* StackTrace;
+@@ -64,19 +64,19 @@ extern UInt VG_(get_StackTrace) ( Thread
+ /*OUT*/StackTrace fps,
+ Word first_ip_delta );
+
+-// Apply a function to every element in the StackTrace. The parameter
+-// 'n' gives the index of the passed ip. 'opaque' is an arbitrary
+-// pointer provided to each invocation of 'action' (a poor man's
+-// closure). Doesn't go below main() unless --show-below-main=yes is
+-// set.
++// Apply a function to every element in the StackTrace. The parameter 'n'
++// gives the index of the passed ip. 'opaque' is an arbitrary pointer
++// provided to each invocation of 'action' (a poor man's closure). 'ep' is
++// the debuginfo epoch assumed to apply to all code addresses in the stack
++// trace. Doesn't go below main() unless --show-below-main=yes is set.
+ extern void VG_(apply_StackTrace)(
+- void(*action)(UInt n, Addr ip, void* opaque),
++ void(*action)(UInt n, DiEpoch ep, Addr ip, void* opaque),
+ void* opaque,
+- StackTrace ips, UInt n_ips
++ DiEpoch ep, StackTrace ips, UInt n_ips
+ );
+
+ // Print a StackTrace.
+-extern void VG_(pp_StackTrace) ( StackTrace ips, UInt n_ips );
++extern void VG_(pp_StackTrace) ( DiEpoch ep, StackTrace ips, UInt n_ips );
+
+ // Gets and immediately prints a StackTrace. Just a bit simpler than
+ // calling VG_(get_StackTrace)() then VG_(pp_StackTrace)().
+Index: valgrind-3.13.0/include/pub_tool_tooliface.h
+===================================================================
+--- valgrind-3.13.0.orig/include/pub_tool_tooliface.h
++++ valgrind-3.13.0/include/pub_tool_tooliface.h
+@@ -463,7 +463,7 @@ extern void VG_(needs_print_stats) (
+ of an address ? */
+ extern void VG_(needs_info_location) (
+ // Get and pp information about Addr
+- void (*info_location)(Addr)
++ void (*info_location)(DiEpoch, Addr)
+ );
+
+ /* Do we need to see variable type and location information? */
+Index: valgrind-3.13.0/lackey/lk_main.c
+===================================================================
+--- valgrind-3.13.0.orig/lackey/lk_main.c
++++ valgrind-3.13.0/lackey/lk_main.c
+@@ -664,6 +664,7 @@ IRSB* lk_instrument ( VgCallbackClosure*
+ Addr iaddr = 0, dst;
+ UInt ilen = 0;
+ Bool condition_inverted = False;
++ DiEpoch ep = VG_(current_DiEpoch)();
+
+ if (gWordTy != hWordTy) {
+ /* We don't currently support this case. */
+@@ -750,7 +751,7 @@ IRSB* lk_instrument ( VgCallbackClosure*
+ tl_assert(clo_fnname);
+ tl_assert(clo_fnname[0]);
+ const HChar *fnname;
+- if (VG_(get_fnname_if_entry)(st->Ist.IMark.addr,
++ if (VG_(get_fnname_if_entry)(ep, st->Ist.IMark.addr,
+ &fnname)
+ && 0 == VG_(strcmp)(fnname, clo_fnname)) {
+ di = unsafeIRDirty_0_N(
+Index: valgrind-3.13.0/massif/ms_main.c
+===================================================================
+--- valgrind-3.13.0.orig/massif/ms_main.c
++++ valgrind-3.13.0/massif/ms_main.c
+@@ -520,8 +520,9 @@ void filter_IPs (Addr* ips, Int n_ips,
+ // alloc function 'inside' a stacktrace e.g.
+ // 0x1 0x2 0x3 alloc func1 main
+ // becomes 0x1 0x2 0x3 func1 main
++ DiEpoch ep = VG_(current_DiEpoch)();
+ for (i = *top; i < n_ips; i++) {
+- top_has_fnname = VG_(get_fnname)(ips[*top], &fnname);
++ top_has_fnname = VG_(get_fnname)(ep, ips[*top], &fnname);
+ if (top_has_fnname && VG_(strIsMemberXA)(alloc_fns, fnname)) {
+ VERB(4, "filtering alloc fn %s\n", fnname);
+ (*top)++;
+@@ -576,7 +577,8 @@ static ExeContext* make_ec(ThreadId tid,
+ if (exclude_first_entry && n_ips > 0) {
+ const HChar *fnname;
+ VERB(4, "removing top fn %s from stacktrace\n",
+- VG_(get_fnname)(ips[0], &fnname) ? fnname : "???");
++ VG_(get_fnname)(VG_(current_DiEpoch)(), ips[0], &fnname)
++ ? fnname : "???");
+ return VG_(make_ExeContext_from_StackTrace)(ips+1, n_ips-1);
+ } else
+ return VG_(make_ExeContext_from_StackTrace)(ips, n_ips);
+Index: valgrind-3.13.0/memcheck/mc_errors.c
+===================================================================
+--- valgrind-3.13.0.orig/memcheck/mc_errors.c
++++ valgrind-3.13.0/memcheck/mc_errors.c
+@@ -94,15 +94,15 @@ struct _MC_Error {
+ struct {
+ SizeT szB; // size of value in bytes
+ // Origin info
+- UInt otag; // origin tag
+- ExeContext* origin_ec; // filled in later
++ UInt otag; // origin tag
++ ExeContextAndEpoch origin_ece; // filled in later
+ } Value;
+
+ // Use of an undefined value in a conditional branch or move.
+ struct {
+ // Origin info
+- UInt otag; // origin tag
+- ExeContext* origin_ec; // filled in later
++ UInt otag; // origin tag
++ ExeContextAndEpoch origin_ece; // filled in later
+ } Cond;
+
+ // Addressability error in core (signal-handling) operation.
+@@ -127,8 +127,8 @@ struct _MC_Error {
+ // System call register input contains undefined bytes.
+ struct {
+ // Origin info
+- UInt otag; // origin tag
+- ExeContext* origin_ec; // filled in later
++ UInt otag; // origin tag
++ ExeContextAndEpoch origin_ece; // filled in later
+ } RegParam;
+
+ // System call memory input contains undefined/unaddressable bytes
+@@ -136,8 +136,8 @@ struct _MC_Error {
+ Bool isAddrErr; // Addressability or definedness error?
+ AddrInfo ai;
+ // Origin info
+- UInt otag; // origin tag
+- ExeContext* origin_ec; // filled in later
++ UInt otag; // origin tag
++ ExeContextAndEpoch origin_ece; // filled in later
+ } MemParam;
+
+ // Problem found from a client request like CHECK_MEM_IS_ADDRESSABLE.
+@@ -145,8 +145,8 @@ struct _MC_Error {
+ Bool isAddrErr; // Addressability or definedness error?
+ AddrInfo ai;
+ // Origin info
+- UInt otag; // origin tag
+- ExeContext* origin_ec; // filled in later
++ UInt otag; // origin tag
++ ExeContextAndEpoch origin_ece; // filled in later
+ } User;
+
+ // Program tried to free() something that's not a heap block (this
+@@ -279,10 +279,10 @@ static const HChar* pp_Reachedness_for_l
+ }
+ }
+
+-static void mc_pp_origin ( ExeContext* ec, UInt okind )
++static void mc_pp_origin ( ExeContextAndEpoch ece, UInt okind )
+ {
+ const HChar* src = NULL;
+- tl_assert(ec);
++ tl_assert(ece.ec);
+
+ switch (okind) {
+ case MC_OKIND_STACK: src = " by a stack allocation"; break;
+@@ -295,10 +295,10 @@ static void mc_pp_origin ( ExeContext* e
+ if (VG_(clo_xml)) {
+ emit( " <auxwhat>Uninitialised value was created%s</auxwhat>\n",
+ src);
+- VG_(pp_ExeContext)( ec );
++ VG_(pp_ExeContextAndEpoch)( ece );
+ } else {
+ emit( " Uninitialised value was created%s\n", src);
+- VG_(pp_ExeContext)( ec );
++ VG_(pp_ExeContextAndEpoch)( ece );
+ }
+ }
+
+@@ -379,7 +379,7 @@ static void pp_LossRecord(UInt n_this_re
+ emit( " <leakedblocks>%u</leakedblocks>\n", lr->num_blocks);
+ emit( " </xwhat>\n" );
+ }
+- VG_(pp_ExeContext)(lr->key.allocated_at);
++ VG_(pp_ExeContextAndEpoch)(lr->key.allocated_at);
+ } else { /* ! if (xml) */
+ if (lr->indirect_szB > 0) {
+ emit(
+@@ -401,7 +401,7 @@ static void pp_LossRecord(UInt n_this_re
+ n_this_record, n_total_records
+ );
+ }
+- VG_(pp_ExeContext)(lr->key.allocated_at);
++ VG_(pp_ExeContextAndEpoch)(lr->key.allocated_at);
+ } /* if (xml) */
+ }
+
+@@ -427,11 +427,11 @@ void MC_(pp_Error) ( const Error* err )
+ emit( " <kind>CoreMemError</kind>\n" );
+ emit( " <what>%pS contains unaddressable byte(s)</what>\n",
+ VG_(get_error_string)(err));
+- VG_(pp_ExeContext)( VG_(get_error_where)(err) );
++ VG_(pp_ExeContextAndEpoch)( VG_(get_error_where)(err) );
+ } else {
+ emit( "%s contains unaddressable byte(s)\n",
+ VG_(get_error_string)(err));
+- VG_(pp_ExeContext)( VG_(get_error_where)(err) );
++ VG_(pp_ExeContextAndEpoch)( VG_(get_error_where)(err) );
+ }
+ break;
+
+@@ -441,19 +441,19 @@ void MC_(pp_Error) ( const Error* err )
+ emit( " <kind>UninitValue</kind>\n" );
+ emit( " <what>Use of uninitialised value of size %lu</what>\n",
+ extra->Err.Value.szB );
+- VG_(pp_ExeContext)( VG_(get_error_where)(err) );
+- if (extra->Err.Value.origin_ec)
+- mc_pp_origin( extra->Err.Value.origin_ec,
+- extra->Err.Value.otag & 3 );
++ VG_(pp_ExeContextAndEpoch)( VG_(get_error_where)(err) );
++ if (extra->Err.Value.origin_ece.ec)
++ mc_pp_origin( extra->Err.Value.origin_ece,
++ extra->Err.Value.otag & 3 );
+ } else {
+ /* Could also show extra->Err.Cond.otag if debugging origin
+ tracking */
+ emit( "Use of uninitialised value of size %lu\n",
+ extra->Err.Value.szB );
+- VG_(pp_ExeContext)( VG_(get_error_where)(err) );
+- if (extra->Err.Value.origin_ec)
+- mc_pp_origin( extra->Err.Value.origin_ec,
+- extra->Err.Value.otag & 3 );
++ VG_(pp_ExeContextAndEpoch)( VG_(get_error_where)(err) );
++ if (extra->Err.Value.origin_ece.ec)
++ mc_pp_origin( extra->Err.Value.origin_ece,
++ extra->Err.Value.otag & 3 );
+ }
+ break;
+
+@@ -463,18 +463,18 @@ void MC_(pp_Error) ( const Error* err )
+ emit( " <kind>UninitCondition</kind>\n" );
+ emit( " <what>Conditional jump or move depends"
+ " on uninitialised value(s)</what>\n" );
+- VG_(pp_ExeContext)( VG_(get_error_where)(err) );
+- if (extra->Err.Cond.origin_ec)
+- mc_pp_origin( extra->Err.Cond.origin_ec,
++ VG_(pp_ExeContextAndEpoch)( VG_(get_error_where)(err) );
++ if (extra->Err.Cond.origin_ece.ec)
++ mc_pp_origin( extra->Err.Cond.origin_ece,
+ extra->Err.Cond.otag & 3 );
+ } else {
+ /* Could also show extra->Err.Cond.otag if debugging origin
+ tracking */
+ emit( "Conditional jump or move depends"
+ " on uninitialised value(s)\n" );
+- VG_(pp_ExeContext)( VG_(get_error_where)(err) );
+- if (extra->Err.Cond.origin_ec)
+- mc_pp_origin( extra->Err.Cond.origin_ec,
++ VG_(pp_ExeContextAndEpoch)( VG_(get_error_where)(err) );
++ if (extra->Err.Cond.origin_ece.ec)
++ mc_pp_origin( extra->Err.Cond.origin_ece,
+ extra->Err.Cond.otag & 3 );
+ }
+ break;
+@@ -486,16 +486,16 @@ void MC_(pp_Error) ( const Error* err )
+ emit( " <what>Syscall param %pS contains "
+ "uninitialised byte(s)</what>\n",
+ VG_(get_error_string)(err) );
+- VG_(pp_ExeContext)( VG_(get_error_where)(err) );
+- if (extra->Err.RegParam.origin_ec)
+- mc_pp_origin( extra->Err.RegParam.origin_ec,
++ VG_(pp_ExeContextAndEpoch)( VG_(get_error_where)(err) );
++ if (extra->Err.RegParam.origin_ece.ec)
++ mc_pp_origin( extra->Err.RegParam.origin_ece,
+ extra->Err.RegParam.otag & 3 );
+ } else {
+ emit( "Syscall param %s contains uninitialised byte(s)\n",
+ VG_(get_error_string)(err) );
+- VG_(pp_ExeContext)( VG_(get_error_where)(err) );
+- if (extra->Err.RegParam.origin_ec)
+- mc_pp_origin( extra->Err.RegParam.origin_ec,
++ VG_(pp_ExeContextAndEpoch)( VG_(get_error_where)(err) );
++ if (extra->Err.RegParam.origin_ece.ec)
++ mc_pp_origin( extra->Err.RegParam.origin_ece,
+ extra->Err.RegParam.otag & 3 );
+ }
+ break;
+@@ -509,24 +509,24 @@ void MC_(pp_Error) ( const Error* err )
+ VG_(get_error_string)(err),
+ extra->Err.MemParam.isAddrErr
+ ? "unaddressable" : "uninitialised" );
+- VG_(pp_ExeContext)( VG_(get_error_where)(err) );
++ VG_(pp_ExeContextAndEpoch)( VG_(get_error_where)(err) );
+ VG_(pp_addrinfo_mc)(VG_(get_error_address)(err),
+ &extra->Err.MemParam.ai, False);
+- if (extra->Err.MemParam.origin_ec
++ if (extra->Err.MemParam.origin_ece.ec
+ && !extra->Err.MemParam.isAddrErr)
+- mc_pp_origin( extra->Err.MemParam.origin_ec,
++ mc_pp_origin( extra->Err.MemParam.origin_ece,
+ extra->Err.MemParam.otag & 3 );
+ } else {
+ emit( "Syscall param %s points to %s byte(s)\n",
+ VG_(get_error_string)(err),
+ extra->Err.MemParam.isAddrErr
+ ? "unaddressable" : "uninitialised" );
+- VG_(pp_ExeContext)( VG_(get_error_where)(err) );
++ VG_(pp_ExeContextAndEpoch)( VG_(get_error_where)(err) );
+ VG_(pp_addrinfo_mc)(VG_(get_error_address)(err),
+ &extra->Err.MemParam.ai, False);
+- if (extra->Err.MemParam.origin_ec
++ if (extra->Err.MemParam.origin_ece.ec
+ && !extra->Err.MemParam.isAddrErr)
+- mc_pp_origin( extra->Err.MemParam.origin_ec,
++ mc_pp_origin( extra->Err.MemParam.origin_ece,
+ extra->Err.MemParam.otag & 3 );
+ }
+ break;
+@@ -540,21 +540,21 @@ void MC_(pp_Error) ( const Error* err )
+ "during client check request</what>\n",
+ extra->Err.User.isAddrErr
+ ? "Unaddressable" : "Uninitialised" );
+- VG_(pp_ExeContext)( VG_(get_error_where)(err) );
++ VG_(pp_ExeContextAndEpoch)( VG_(get_error_where)(err) );
+ VG_(pp_addrinfo_mc)(VG_(get_error_address)(err), &extra->Err.User.ai,
+ False);
+- if (extra->Err.User.origin_ec && !extra->Err.User.isAddrErr)
+- mc_pp_origin( extra->Err.User.origin_ec,
++ if (extra->Err.User.origin_ece.ec && !extra->Err.User.isAddrErr)
++ mc_pp_origin( extra->Err.User.origin_ece,
+ extra->Err.User.otag & 3 );
+ } else {
+ emit( "%s byte(s) found during client check request\n",
+ extra->Err.User.isAddrErr
+ ? "Unaddressable" : "Uninitialised" );
+- VG_(pp_ExeContext)( VG_(get_error_where)(err) );
++ VG_(pp_ExeContextAndEpoch)( VG_(get_error_where)(err) );
+ VG_(pp_addrinfo_mc)(VG_(get_error_address)(err), &extra->Err.User.ai,
+ False);
+- if (extra->Err.User.origin_ec && !extra->Err.User.isAddrErr)
+- mc_pp_origin( extra->Err.User.origin_ec,
++ if (extra->Err.User.origin_ece.ec && !extra->Err.User.isAddrErr)
++ mc_pp_origin( extra->Err.User.origin_ece,
+ extra->Err.User.otag & 3 );
+ }
+ break;
+@@ -564,12 +564,12 @@ void MC_(pp_Error) ( const Error* err )
+ emit( " <kind>InvalidFree</kind>\n" );
+ emit( " <what>Invalid free() / delete / delete[]"
+ " / realloc()</what>\n" );
+- VG_(pp_ExeContext)( VG_(get_error_where)(err) );
++ VG_(pp_ExeContextAndEpoch)( VG_(get_error_where)(err) );
+ VG_(pp_addrinfo_mc)( VG_(get_error_address)(err),
+ &extra->Err.Free.ai, False );
+ } else {
+ emit( "Invalid free() / delete / delete[] / realloc()\n" );
+- VG_(pp_ExeContext)( VG_(get_error_where)(err) );
++ VG_(pp_ExeContextAndEpoch)( VG_(get_error_where)(err) );
+ VG_(pp_addrinfo_mc)( VG_(get_error_address)(err),
+ &extra->Err.Free.ai, False );
+ }
+@@ -579,12 +579,12 @@ void MC_(pp_Error) ( const Error* err )
+ if (xml) {
+ emit( " <kind>MismatchedFree</kind>\n" );
+ emit( " <what>Mismatched free() / delete / delete []</what>\n" );
+- VG_(pp_ExeContext)( VG_(get_error_where)(err) );
++ VG_(pp_ExeContextAndEpoch)( VG_(get_error_where)(err) );
+ VG_(pp_addrinfo_mc)(VG_(get_error_address)(err),
+ &extra->Err.FreeMismatch.ai, False);
+ } else {
+ emit( "Mismatched free() / delete / delete []\n" );
+- VG_(pp_ExeContext)( VG_(get_error_where)(err) );
++ VG_(pp_ExeContextAndEpoch)( VG_(get_error_where)(err) );
+ VG_(pp_addrinfo_mc)(VG_(get_error_address)(err),
+ &extra->Err.FreeMismatch.ai, False);
+ }
+@@ -597,7 +597,7 @@ void MC_(pp_Error) ( const Error* err )
+ emit( " <what>Invalid %s of size %lu</what>\n",
+ extra->Err.Addr.isWrite ? "write" : "read",
+ extra->Err.Addr.szB );
+- VG_(pp_ExeContext)( VG_(get_error_where)(err) );
++ VG_(pp_ExeContextAndEpoch)( VG_(get_error_where)(err) );
+ VG_(pp_addrinfo_mc)( VG_(get_error_address)(err),
+ &extra->Err.Addr.ai,
+ extra->Err.Addr.maybe_gcc );
+@@ -605,7 +605,7 @@ void MC_(pp_Error) ( const Error* err )
+ emit( "Invalid %s of size %lu\n",
+ extra->Err.Addr.isWrite ? "write" : "read",
+ extra->Err.Addr.szB );
+- VG_(pp_ExeContext)( VG_(get_error_where)(err) );
++ VG_(pp_ExeContextAndEpoch)( VG_(get_error_where)(err) );
+
+ VG_(pp_addrinfo_mc)( VG_(get_error_address)(err),
+ &extra->Err.Addr.ai,
+@@ -618,12 +618,12 @@ void MC_(pp_Error) ( const Error* err )
+ emit( " <kind>InvalidJump</kind>\n" );
+ emit( " <what>Jump to the invalid address stated "
+ "on the next line</what>\n" );
+- VG_(pp_ExeContext)( VG_(get_error_where)(err) );
++ VG_(pp_ExeContextAndEpoch)( VG_(get_error_where)(err) );
+ VG_(pp_addrinfo_mc)( VG_(get_error_address)(err), &extra->Err.Jump.ai,
+ False );
+ } else {
+ emit( "Jump to the invalid address stated on the next line\n" );
+- VG_(pp_ExeContext)( VG_(get_error_where)(err) );
++ VG_(pp_ExeContextAndEpoch)( VG_(get_error_where)(err) );
+ VG_(pp_addrinfo_mc)( VG_(get_error_address)(err), &extra->Err.Jump.ai,
+ False );
+ }
+@@ -644,7 +644,7 @@ void MC_(pp_Error) ( const Error* err )
+ extra->Err.Overlap.dst, extra->Err.Overlap.src,
+ extra->Err.Overlap.szB );
+ }
+- VG_(pp_ExeContext)( VG_(get_error_where)(err) );
++ VG_(pp_ExeContextAndEpoch)( VG_(get_error_where)(err) );
+ } else {
+ if (extra->Err.Overlap.szB == 0) {
+ emit( "Source and destination overlap in %s(%#lx, %#lx)\n",
+@@ -656,7 +656,7 @@ void MC_(pp_Error) ( const Error* err )
+ extra->Err.Overlap.dst, extra->Err.Overlap.src,
+ extra->Err.Overlap.szB );
+ }
+- VG_(pp_ExeContext)( VG_(get_error_where)(err) );
++ VG_(pp_ExeContextAndEpoch)( VG_(get_error_where)(err) );
+ }
+ break;
+
+@@ -666,12 +666,12 @@ void MC_(pp_Error) ( const Error* err )
+ if (xml) {
+ emit( " <kind>InvalidMemPool</kind>\n" );
+ emit( " <what>Illegal memory pool address</what>\n" );
+- VG_(pp_ExeContext)( VG_(get_error_where)(err) );
++ VG_(pp_ExeContextAndEpoch)( VG_(get_error_where)(err) );
+ VG_(pp_addrinfo_mc)( VG_(get_error_address)(err),
+ &extra->Err.IllegalMempool.ai, False );
+ } else {
+ emit( "Illegal memory pool address\n" );
+- VG_(pp_ExeContext)( VG_(get_error_where)(err) );
++ VG_(pp_ExeContextAndEpoch)( VG_(get_error_where)(err) );
+ VG_(pp_addrinfo_mc)( VG_(get_error_address)(err),
+ &extra->Err.IllegalMempool.ai, False );
+ }
+@@ -695,14 +695,14 @@ void MC_(pp_Error) ( const Error* err )
+ extra->Err.FishyValue.function_name,
+ (SSizeT)extra->Err.FishyValue.value);
+ emit( "</what>");
+- VG_(pp_ExeContext)( VG_(get_error_where)(err) );
++ VG_(pp_ExeContextAndEpoch)( VG_(get_error_where)(err) );
+ } else {
+ emit( "Argument '%s' of function %s has a fishy "
+ "(possibly negative) value: %ld\n",
+ extra->Err.FishyValue.argument_name,
+ extra->Err.FishyValue.function_name,
+ (SSizeT)extra->Err.FishyValue.value);
+- VG_(pp_ExeContext)( VG_(get_error_where)(err) );
++ VG_(pp_ExeContextAndEpoch)( VG_(get_error_where)(err) );
+ }
+ break;
+
+@@ -773,9 +773,10 @@ void MC_(record_value_error) ( ThreadId
+ tl_assert( MC_(clo_mc_level) >= 2 );
+ if (otag > 0)
+ tl_assert( MC_(clo_mc_level) == 3 );
+- extra.Err.Value.szB = szB;
+- extra.Err.Value.otag = otag;
+- extra.Err.Value.origin_ec = NULL; /* Filled in later */
++ extra.Err.Value.szB = szB;
++ extra.Err.Value.otag = otag;
++ extra.Err.Value.origin_ece = VG_(invalid_ExeContextAndEpoch)();
++ /* Filled in later */
+ VG_(maybe_record_error)( tid, Err_Value, /*addr*/0, /*s*/NULL, &extra );
+ }
+
+@@ -785,8 +786,9 @@ void MC_(record_cond_error) ( ThreadId t
+ tl_assert( MC_(clo_mc_level) >= 2 );
+ if (otag > 0)
+ tl_assert( MC_(clo_mc_level) == 3 );
+- extra.Err.Cond.otag = otag;
+- extra.Err.Cond.origin_ec = NULL; /* Filled in later */
++ extra.Err.Cond.otag = otag;
++ extra.Err.Cond.origin_ece = VG_(invalid_ExeContextAndEpoch)();
++ /* Filled in later */
+ VG_(maybe_record_error)( tid, Err_Cond, /*addr*/0, /*s*/NULL, &extra );
+ }
+
+@@ -804,8 +806,9 @@ void MC_(record_regparam_error) ( Thread
+ tl_assert(VG_INVALID_THREADID != tid);
+ if (otag > 0)
+ tl_assert( MC_(clo_mc_level) == 3 );
+- extra.Err.RegParam.otag = otag;
+- extra.Err.RegParam.origin_ec = NULL; /* Filled in later */
++ extra.Err.RegParam.otag = otag;
++ extra.Err.RegParam.origin_ece = VG_(invalid_ExeContextAndEpoch)();
++ /* Filled in later */
+ VG_(maybe_record_error)( tid, Err_RegParam, /*addr*/0, msg, &extra );
+ }
+
+@@ -820,10 +823,11 @@ void MC_(record_memparam_error) ( Thread
+ tl_assert( MC_(clo_mc_level) == 3 );
+ tl_assert( !isAddrErr );
+ }
+- extra.Err.MemParam.isAddrErr = isAddrErr;
+- extra.Err.MemParam.ai.tag = Addr_Undescribed;
+- extra.Err.MemParam.otag = otag;
+- extra.Err.MemParam.origin_ec = NULL; /* Filled in later */
++ extra.Err.MemParam.isAddrErr = isAddrErr;
++ extra.Err.MemParam.ai.tag = Addr_Undescribed;
++ extra.Err.MemParam.otag = otag;
++ extra.Err.MemParam.origin_ece = VG_(invalid_ExeContextAndEpoch)();
++ /* Filled in later */
+ VG_(maybe_record_error)( tid, Err_MemParam, a, msg, &extra );
+ }
+
+@@ -925,10 +929,11 @@ void MC_(record_user_error) ( ThreadId t
+ tl_assert( MC_(clo_mc_level) >= 2 );
+ }
+ tl_assert(VG_INVALID_THREADID != tid);
+- extra.Err.User.isAddrErr = isAddrErr;
+- extra.Err.User.ai.tag = Addr_Undescribed;
+- extra.Err.User.otag = otag;
+- extra.Err.User.origin_ec = NULL; /* Filled in later */
++ extra.Err.User.isAddrErr = isAddrErr;
++ extra.Err.User.ai.tag = Addr_Undescribed;
++ extra.Err.User.otag = otag;
++ extra.Err.User.origin_ece = VG_(invalid_ExeContextAndEpoch)();
++ /* Filled in later */
+ VG_(maybe_record_error)( tid, Err_User, a, /*s*/NULL, &extra );
+ }
+
+@@ -1053,7 +1058,7 @@ static Bool mempool_block_maybe_describe
+
+ /* Describe an address as best you can, for error messages,
+ putting the result in ai. */
+-static void describe_addr ( Addr a, /*OUT*/AddrInfo* ai )
++static void describe_addr ( DiEpoch ep, Addr a, /*OUT*/AddrInfo* ai )
+ {
+ MC_Chunk* mc;
+
+@@ -1121,28 +1126,30 @@ static void describe_addr ( Addr a, /*OU
+ }
+
+ /* No block found. Search a non-heap block description. */
+- VG_(describe_addr) (a, ai);
++ VG_(describe_addr) (ep, a, ai);
+ }
+
+-void MC_(pp_describe_addr) ( Addr a )
++void MC_(pp_describe_addr) ( DiEpoch ep, Addr a )
+ {
+ AddrInfo ai;
+
+ ai.tag = Addr_Undescribed;
+- describe_addr (a, &ai);
++ describe_addr (ep, a, &ai);
+ VG_(pp_addrinfo_mc) (a, &ai, /* maybe_gcc */ False);
+ VG_(clear_addrinfo) (&ai);
+ }
+
+-/* Fill in *origin_ec as specified by otag, or NULL it out if otag
++/* Fill in *origin_ece as specified by otag, or NULL it out if otag
+ does not refer to a known origin. */
+-static void update_origin ( /*OUT*/ExeContext** origin_ec,
++static void update_origin ( /*OUT*/ExeContextAndEpoch* origin_ece,
+ UInt otag )
+ {
+ UInt ecu = otag & ~3;
+- *origin_ec = NULL;
+ if (VG_(is_plausible_ECU)(ecu)) {
+- *origin_ec = VG_(get_ExeContext_from_ECU)( ecu );
++ *origin_ece
++ = VG_(tag_EC_with_current_epoch)(VG_(get_ExeContext_from_ECU)( ecu ));
++ } else {
++ *origin_ece = VG_(invalid_ExeContextAndEpoch)();
+ }
+ }
+
+@@ -1150,6 +1157,7 @@ static void update_origin ( /*OUT*/ExeCo
+ UInt MC_(update_Error_extra)( const Error* err )
+ {
+ MC_Error* extra = VG_(get_error_extra)(err);
++ DiEpoch ep = VG_(get_error_where)(err).epoch;
+
+ switch (VG_(get_error_kind)(err)) {
+ // These ones don't have addresses associated with them, and so don't
+@@ -1169,45 +1177,45 @@ UInt MC_(update_Error_extra)( const Erro
+ // origin tag. Note that it is a kludge to assume that
+ // a length-1 trace indicates a stack origin. FIXME.
+ case Err_Value:
+- update_origin( &extra->Err.Value.origin_ec,
++ update_origin( &extra->Err.Value.origin_ece,
+ extra->Err.Value.otag );
+ return sizeof(MC_Error);
+ case Err_Cond:
+- update_origin( &extra->Err.Cond.origin_ec,
++ update_origin( &extra->Err.Cond.origin_ece,
+ extra->Err.Cond.otag );
+ return sizeof(MC_Error);
+ case Err_RegParam:
+- update_origin( &extra->Err.RegParam.origin_ec,
++ update_origin( &extra->Err.RegParam.origin_ece,
+ extra->Err.RegParam.otag );
+ return sizeof(MC_Error);
+
+ // These ones always involve a memory address.
+ case Err_Addr:
+- describe_addr ( VG_(get_error_address)(err),
++ describe_addr ( ep, VG_(get_error_address)(err),
+ &extra->Err.Addr.ai );
+ return sizeof(MC_Error);
+ case Err_MemParam:
+- describe_addr ( VG_(get_error_address)(err),
++ describe_addr ( ep, VG_(get_error_address)(err),
+ &extra->Err.MemParam.ai );
+- update_origin( &extra->Err.MemParam.origin_ec,
++ update_origin( &extra->Err.MemParam.origin_ece,
+ extra->Err.MemParam.otag );
+ return sizeof(MC_Error);
+ case Err_Jump:
+- describe_addr ( VG_(get_error_address)(err),
++ describe_addr ( ep, VG_(get_error_address)(err),
+ &extra->Err.Jump.ai );
+ return sizeof(MC_Error);
+ case Err_User:
+- describe_addr ( VG_(get_error_address)(err),
++ describe_addr ( ep, VG_(get_error_address)(err),
+ &extra->Err.User.ai );
+- update_origin( &extra->Err.User.origin_ec,
++ update_origin( &extra->Err.User.origin_ece,
+ extra->Err.User.otag );
+ return sizeof(MC_Error);
+ case Err_Free:
+- describe_addr ( VG_(get_error_address)(err),
++ describe_addr ( ep, VG_(get_error_address)(err),
+ &extra->Err.Free.ai );
+ return sizeof(MC_Error);
+ case Err_IllegalMempool:
+- describe_addr ( VG_(get_error_address)(err),
++ describe_addr ( ep, VG_(get_error_address)(err),
+ &extra->Err.IllegalMempool.ai );
+ return sizeof(MC_Error);
+
+@@ -1252,7 +1260,7 @@ static Bool client_block_maybe_describe(
+ ai->Addr.Block.rwoffset = (Word)(a) - (Word)(cgbs[i].start);
+ ai->Addr.Block.allocated_at = cgbs[i].where;
+ VG_(initThreadInfo) (&ai->Addr.Block.alloc_tinfo);
+- ai->Addr.Block.freed_at = VG_(null_ExeContext)();;
++ ai->Addr.Block.freed_at = VG_(null_ExeContextAndEpoch)();
+ return True;
+ }
+ }
+Index: valgrind-3.13.0/memcheck/mc_include.h
+===================================================================
+--- valgrind-3.13.0.orig/memcheck/mc_include.h
++++ valgrind-3.13.0/memcheck/mc_include.h
+@@ -67,17 +67,17 @@ typedef
+ Addr data; // Address of the actual block.
+ SizeT szB : (sizeof(SizeT)*8)-2; // Size requested; 30 or 62 bits.
+ MC_AllocKind allockind : 2; // Which operation did the allocation.
+- ExeContext* where[0];
++ ExeContextAndEpoch where[0];
+ /* Variable-length array. The size depends on MC_(clo_keep_stacktraces).
+ This array optionally stores the alloc and/or free stack trace. */
+ }
+ MC_Chunk;
+
+-/* Returns the execontext where the MC_Chunk was allocated/freed.
++/* Returns the execontext and epoch where the MC_Chunk was allocated/freed.
+ Returns VG_(null_ExeContext)() if the execontext has not been recorded (due
+ to MC_(clo_keep_stacktraces) and/or because block not yet freed). */
+-ExeContext* MC_(allocated_at) (MC_Chunk*);
+-ExeContext* MC_(freed_at) (MC_Chunk*);
++ExeContextAndEpoch MC_(allocated_at) (MC_Chunk*);
++ExeContextAndEpoch MC_(freed_at) (MC_Chunk*);
+
+ /* Records and sets execontext according to MC_(clo_keep_stacktraces) */
+ void MC_(set_allocated_at) (ThreadId, MC_Chunk*);
+@@ -432,8 +432,8 @@ typedef
+ /* When a LossRecord is put into an OSet, these elements represent the key. */
+ typedef
+ struct _LossRecordKey {
+- Reachedness state; // LC_Extra.state value shared by all blocks.
+- ExeContext* allocated_at; // Where they were allocated.
++ Reachedness state; // LC_Extra.state value shared by all blocks.
++ ExeContextAndEpoch allocated_at; // Where they were allocated.
+ }
+ LossRecordKey;
+
+@@ -569,8 +569,8 @@ Bool MC_(record_fishy_value_error) ( Th
+ /* Leak kinds tokens to call VG_(parse_enum_set). */
+ extern const HChar* MC_(parse_leak_kinds_tokens);
+
+-/* prints a description of address a */
+-void MC_(pp_describe_addr) (Addr a);
++/* prints a description of address a in the specified debuginfo epoch */
++void MC_(pp_describe_addr) ( DiEpoch ep, Addr a );
+
+ /* Is this address in a user-specified "ignored range" ? */
+ Bool MC_(in_ignored_range) ( Addr a );
+@@ -588,10 +588,10 @@ Bool MC_(in_ignored_range_below_sp) ( Ad
+ start == size == 0. */
+ typedef
+ struct {
+- Addr start;
+- SizeT size;
+- ExeContext* where;
+- HChar* desc;
++ Addr start;
++ SizeT size;
++ ExeContextAndEpoch where;
++ HChar* desc;
+ }
+ CGenBlock;
+
+Index: valgrind-3.13.0/memcheck/mc_leakcheck.c
+===================================================================
+--- valgrind-3.13.0.orig/memcheck/mc_leakcheck.c
++++ valgrind-3.13.0/memcheck/mc_leakcheck.c
+@@ -1060,6 +1060,8 @@ lc_scan_memory(Addr start, SizeT len, Bo
+ const Addr end = VG_ROUNDDN(start+len, sizeof(Addr));
+ fault_catcher_t prev_catcher;
+
++ const DiEpoch ep = VG_(current_DiEpoch)();
++
+ if (VG_DEBUG_LEAKCHECK)
+ VG_(printf)("scan %#lx-%#lx (%lu)\n", start, end, len);
+
+@@ -1139,14 +1141,14 @@ lc_scan_memory(Addr start, SizeT len, Bo
+ if (addr >= searched && addr < searched + szB) {
+ if (addr == searched) {
+ VG_(umsg)("*%#lx points at %#lx\n", ptr, searched);
+- MC_(pp_describe_addr) (ptr);
++ MC_(pp_describe_addr) (ep, ptr); // FIXME JRS: ep correct?
+ } else {
+ Int ch_no;
+ MC_Chunk *ch;
+ LC_Extra *ex;
+ VG_(umsg)("*%#lx interior points at %lu bytes inside %#lx\n",
+ ptr, (long unsigned) addr - searched, searched);
+- MC_(pp_describe_addr) (ptr);
++ MC_(pp_describe_addr) (ep, ptr); // FIXME JRS: ep correct?
+ if (lc_is_a_chunk_ptr(addr, &ch_no, &ch, &ex) ) {
+ Int h;
+ for (h = LchStdString; h < N_LEAK_CHECK_HEURISTICS; h++) {
+@@ -1203,13 +1205,17 @@ static Word cmp_LossRecordKey_LossRecord
+ // Compare on states first because that's fast.
+ if (a->state < b->state) return -1;
+ if (a->state > b->state) return 1;
+- // Ok, the states are equal. Now compare the locations, which is slower.
++ // Also on epochs, for the same reason.
++ if (a->allocated_at.epoch.n < b->allocated_at.epoch.n) return -1;
++ if (a->allocated_at.epoch.n > b->allocated_at.epoch.n) return 1;
++ // Ok, the states and epochs are equal. Now compare the locations, which
++ // is slower.
+ if (VG_(eq_ExeContext)(
+- MC_(clo_leak_resolution), a->allocated_at, b->allocated_at))
++ MC_(clo_leak_resolution), a->allocated_at.ec, b->allocated_at.ec))
+ return 0;
+ // Different locations. Ordering is arbitrary, just use the ec pointer.
+- if (a->allocated_at < b->allocated_at) return -1;
+- if (a->allocated_at > b->allocated_at) return 1;
++ if (a->allocated_at.ec < b->allocated_at.ec) return -1;
++ if (a->allocated_at.ec > b->allocated_at.ec) return 1;
+ VG_(tool_panic)("bad LossRecord comparison");
+ }
+
+@@ -1231,10 +1237,15 @@ static Int cmp_LossRecords(const void* v
+ // possible. So: compare num_blocks.
+ if (lr_a->num_blocks < lr_b->num_blocks) return -1;
+ if (lr_a->num_blocks > lr_b->num_blocks) return 1;
++ // Then epochs.
++ if (lr_a->key.allocated_at.epoch.n < lr_b->key.allocated_at.epoch.n)
++ return -1;
++ if (lr_a->key.allocated_at.epoch.n > lr_b->key.allocated_at.epoch.n)
++ return 1;
+ // Finally, compare ExeContext addresses... older ones are likely to have
+ // lower addresses.
+- if (lr_a->key.allocated_at < lr_b->key.allocated_at) return -1;
+- if (lr_a->key.allocated_at > lr_b->key.allocated_at) return 1;
++ if (lr_a->key.allocated_at.ec < lr_b->key.allocated_at.ec) return -1;
++ if (lr_a->key.allocated_at.ec > lr_b->key.allocated_at.ec) return 1;
+ return 0;
+ }
+
+@@ -1381,7 +1392,7 @@ static void XT_insert_lr (LossRecord* lr
+ xtl.xt_lr[i].vid[XT_Decrease].num_blocks
+ = lr->old_num_blocks - lr->num_blocks;
+
+- VG_(XT_add_to_ec)(leak_xt, lr->key.allocated_at, &xtl);
++ VG_(XT_add_to_ec)(leak_xt, lr->key.allocated_at.ec, &xtl);
+ }
+
+ static void MC_(XT_Leak_sub) (void* from, const void* xtleak)
+@@ -2133,9 +2144,9 @@ void MC_(detect_memory_leaks) ( ThreadId
+ VG_(umsg)("Block 0x%lx..0x%lx overlaps with block 0x%lx..0x%lx\n",
+ start1, end1, start2, end2);
+ VG_(umsg)("Blocks allocation contexts:\n"),
+- VG_(pp_ExeContext)( MC_(allocated_at)(ch1));
++ VG_(pp_ExeContextAndEpoch)( MC_(allocated_at)(ch1));
+ VG_(umsg)("\n"),
+- VG_(pp_ExeContext)( MC_(allocated_at)(ch2));
++ VG_(pp_ExeContextAndEpoch)( MC_(allocated_at)(ch2));
+ VG_(umsg)("This is usually caused by using ");
+ VG_(umsg)("VALGRIND_MALLOCLIKE_BLOCK in an inappropriate way.\n");
+ tl_assert (0);
+Index: valgrind-3.13.0/memcheck/mc_main.c
+===================================================================
+--- valgrind-3.13.0.orig/memcheck/mc_main.c
++++ valgrind-3.13.0/memcheck/mc_main.c
+@@ -6719,9 +6719,11 @@ static Bool handle_gdb_monitor_command (
+ const HChar* src;
+ UInt otag;
+ UInt ecu;
+- ExeContext* origin_ec;
++ ExeContextAndEpoch origin_ece;
+ MC_ReadResult res;
+
++ const DiEpoch ep = VG_(current_DiEpoch)();
++
+ Int kwdid = VG_(keyword_id)
+ ("addressable defined",
+ VG_(strtok_r) (NULL, " ", &ssaveptr), kwd_report_all);
+@@ -6738,7 +6740,8 @@ static Bool handle_gdb_monitor_command (
+ VG_(printf)
+ ("Address %p len %lu not addressable:\nbad address %p\n",
+ (void *)address, szB, (void *) bad_addr);
+- MC_(pp_describe_addr) (address);
++ // FIXME JRS epoch ok?
++ MC_(pp_describe_addr) (ep, address);
+ break;
+ case 1: /* defined */
+ res = is_mem_defined ( address, szB, &bad_addr, &otag );
+@@ -6765,14 +6768,16 @@ static Bool handle_gdb_monitor_command (
+ (void *)address, szB, (void *) bad_addr, src);
+ ecu = otag & ~3;
+ if (VG_(is_plausible_ECU)(ecu)) {
+- origin_ec = VG_(get_ExeContext_from_ECU)( ecu );
+- VG_(pp_ExeContext)( origin_ec );
++ origin_ece = VG_(tag_EC_with_current_epoch)(
++ VG_(get_ExeContext_from_ECU)( ecu ));
++ VG_(pp_ExeContextAndEpoch)( origin_ece );
+ }
+ }
+ else
+ VG_(printf) ("Address %p len %lu defined\n",
+ (void *)address, szB);
+- MC_(pp_describe_addr) (address);
++ // FIXME JRS epoch ok?
++ MC_(pp_describe_addr) (ep, address);
+ break;
+ default: tl_assert(0);
+ }
+@@ -7049,7 +7054,9 @@ static Bool mc_handle_client_request ( T
+ cgbs[i].start = arg[1];
+ cgbs[i].size = arg[2];
+ cgbs[i].desc = VG_(strdup)("mc.mhcr.1", (HChar *)arg[3]);
+- cgbs[i].where = VG_(record_ExeContext) ( tid, 0/*first_ip_delta*/ );
++ cgbs[i].where = VG_(tag_EC_with_current_epoch)(
++ VG_(record_ExeContext) ( tid,
++ 0/*first_ip_delta*/ ));
+ *ret = i;
+ } else
+ *ret = -1;
+@@ -7917,7 +7924,7 @@ static void mc_post_clo_init ( void )
+ }
+
+ MC_(chunk_poolalloc) = VG_(newPA)
+- (sizeof(MC_Chunk) + MC_(n_where_pointers)() * sizeof(ExeContext*),
++ (sizeof(MC_Chunk) + MC_(n_where_pointers)() * sizeof(ExeContextAndEpoch),
+ 1000,
+ VG_(malloc),
+ "mc.cMC.1 (MC_Chunk pools)",
+Index: valgrind-3.13.0/memcheck/mc_malloc_wrappers.c
+===================================================================
+--- valgrind-3.13.0.orig/memcheck/mc_malloc_wrappers.c
++++ valgrind-3.13.0/memcheck/mc_malloc_wrappers.c
+@@ -199,8 +199,8 @@ MC_Chunk* create_MC_Chunk ( ThreadId tid
+ mc->szB = szB;
+ mc->allockind = kind;
+ switch ( MC_(n_where_pointers)() ) {
+- case 2: mc->where[1] = 0; // fallback to 1
+- case 1: mc->where[0] = 0; // fallback to 0
++ case 2: mc->where[1] = VG_(invalid_ExeContextAndEpoch)(); // fall thru
++ case 1: mc->where[0] = VG_(invalid_ExeContextAndEpoch)(); // fall thru
+ case 0: break;
+ default: tl_assert(0);
+ }
+@@ -268,30 +268,34 @@ static Bool live_block (MC_Chunk* mc)
+ return in_block_list ( MC_(malloc_list), mc );
+ }
+
+-ExeContext* MC_(allocated_at) (MC_Chunk* mc)
++ExeContextAndEpoch MC_(allocated_at) (MC_Chunk* mc)
+ {
+ switch (MC_(clo_keep_stacktraces)) {
+- case KS_none: return VG_(null_ExeContext) ();
++ case KS_none: return VG_(null_ExeContextAndEpoch) ();
+ case KS_alloc: return mc->where[0];
+- case KS_free: return VG_(null_ExeContext) ();
+- case KS_alloc_then_free: return (live_block(mc) ?
+- mc->where[0] : VG_(null_ExeContext) ());
++ case KS_free: return VG_(null_ExeContextAndEpoch) ();
++ case KS_alloc_then_free: return live_block(mc)
++ ? mc->where[0]
++ : VG_(null_ExeContextAndEpoch) ();
+ case KS_alloc_and_free: return mc->where[0];
+ default: tl_assert (0);
+ }
+ }
+
+-ExeContext* MC_(freed_at) (MC_Chunk* mc)
++ExeContextAndEpoch MC_(freed_at) (MC_Chunk* mc)
+ {
+ switch (MC_(clo_keep_stacktraces)) {
+- case KS_none: return VG_(null_ExeContext) ();
+- case KS_alloc: return VG_(null_ExeContext) ();
+- case KS_free: return (mc->where[0] ?
+- mc->where[0] : VG_(null_ExeContext) ());
+- case KS_alloc_then_free: return (live_block(mc) ?
+- VG_(null_ExeContext) () : mc->where[0]);
+- case KS_alloc_and_free: return (mc->where[1] ?
+- mc->where[1] : VG_(null_ExeContext) ());
++ case KS_none: return VG_(null_ExeContextAndEpoch) ();
++ case KS_alloc: return VG_(null_ExeContextAndEpoch) ();
++ case KS_free: return mc->where[0].ec
++ ? mc->where[0]
++ : VG_(null_ExeContextAndEpoch) ();
++ case KS_alloc_then_free: return live_block(mc)
++ ? VG_(null_ExeContextAndEpoch) ()
++ : mc->where[0];
++ case KS_alloc_and_free: return mc->where[1].ec
++ ? mc->where[1]
++ : VG_(null_ExeContextAndEpoch) ();
+ default: tl_assert (0);
+ }
+ }
+@@ -306,15 +310,16 @@ void MC_(set_allocated_at) (ThreadId ti
+ case KS_alloc_and_free: break;
+ default: tl_assert (0);
+ }
+- mc->where[0] = VG_(record_ExeContext) ( tid, 0/*first_ip_delta*/ );
++ mc->where[0] = VG_(tag_EC_with_current_epoch)(
++ VG_(record_ExeContext) ( tid, 0/*first_ip_delta*/ ));
+ if (UNLIKELY(VG_(clo_xtree_memory) == Vg_XTMemory_Full))
+- VG_(XTMemory_Full_alloc)(mc->szB, mc->where[0]);
++ VG_(XTMemory_Full_alloc)(mc->szB, mc->where[0].ec);
+ }
+
+ void MC_(set_freed_at) (ThreadId tid, MC_Chunk* mc)
+ {
+ Int pos;
+- ExeContext* ec_free;
++ ExeContextAndEpoch ec_free;
+
+ switch (MC_(clo_keep_stacktraces)) {
+ case KS_none: return;
+@@ -333,9 +338,10 @@ void MC_(set_freed_at) (ThreadId tid, M
+ Note: we are guaranteed to find the ec_alloc in mc->where[0], as
+ mc_post_clo_init verifies the consistency of --xtree-memory and
+ --keep-stacktraces. */
+- ec_free = VG_(record_ExeContext) ( tid, 0/*first_ip_delta*/ );
++ ec_free = VG_(tag_EC_with_current_epoch)(
++ VG_(record_ExeContext) ( tid, 0/*first_ip_delta*/ ));
+ if (UNLIKELY(VG_(clo_xtree_memory) == Vg_XTMemory_Full))
+- VG_(XTMemory_Full_free)(mc->szB, mc->where[0], ec_free);
++ VG_(XTMemory_Full_free)(mc->szB, mc->where[0].ec, ec_free.ec);
+ if (LIKELY(pos >= 0))
+ mc->where[pos] = ec_free;
+ }
+@@ -391,7 +397,7 @@ void* MC_(new_block) ( ThreadId tid,
+ if (is_zeroed)
+ MC_(make_mem_defined)( p, szB );
+ else {
+- UInt ecu = VG_(get_ECU_from_ExeContext)(MC_(allocated_at)(mc));
++ UInt ecu = VG_(get_ECU_from_ExeContext)(MC_(allocated_at)(mc).ec);
+ tl_assert(VG_(is_plausible_ECU)(ecu));
+ MC_(make_mem_undefined_w_otag)( p, szB, ecu | MC_OKIND_HEAP );
+ }
+@@ -605,7 +611,7 @@ void* MC_(realloc) ( ThreadId tid, void*
+ // If the block has grown, we mark the grown area as undefined.
+ // We have to do that after VG_(HT_add_node) to ensure the ecu
+ // execontext is for a fully allocated block.
+- ecu = VG_(get_ECU_from_ExeContext)(MC_(allocated_at)(new_mc));
++ ecu = VG_(get_ECU_from_ExeContext)(MC_(allocated_at)(new_mc).ec);
+ tl_assert(VG_(is_plausible_ECU)(ecu));
+ MC_(make_mem_undefined_w_otag)( a_new+old_szB,
+ new_szB-old_szB,
+@@ -673,7 +679,7 @@ void MC_(handle_resizeInPlace)(ThreadId
+ return;
+
+ if (UNLIKELY(VG_(clo_xtree_memory) == Vg_XTMemory_Full))
+- VG_(XTMemory_Full_resize_in_place)(oldSizeB, newSizeB, mc->where[0]);
++ VG_(XTMemory_Full_resize_in_place)(oldSizeB, newSizeB, mc->where[0].ec);
+
+ mc->szB = newSizeB;
+ if (newSizeB < oldSizeB) {
+@@ -887,7 +893,7 @@ check_mempool_sane(MC_Mempool* mp)
+ chunks[i]->data,
+ chunks[i]->data + chunks[i]->szB);
+
+- VG_(pp_ExeContext)(MC_(allocated_at)(chunks[i]));
++ VG_(pp_ExeContextAndEpoch)(MC_(allocated_at)(chunks[i]));
+ }
+ }
+ VG_(free)(chunks);
+@@ -1147,7 +1153,7 @@ static void xtmemory_report_next_block(X
+ if (mc) {
+ xta->nbytes = mc->szB;
+ xta->nblocks = 1;
+- *ec_alloc = MC_(allocated_at)(mc);
++ *ec_alloc = MC_(allocated_at)(mc).ec;
+ } else
+ xta->nblocks = 0;
+ }
+Index: valgrind-3.13.0/memcheck/tests/linux/Makefile.am
+===================================================================
+--- valgrind-3.13.0.orig/memcheck/tests/linux/Makefile.am
++++ valgrind-3.13.0/memcheck/tests/linux/Makefile.am
+@@ -6,6 +6,10 @@ dist_noinst_SCRIPTS = filter_stderr
+ EXTRA_DIST = \
+ brk.stderr.exp brk.vgtest \
+ capget.vgtest capget.stderr.exp capget.stderr.exp2 \
++ dlclose_leak-no-keep.stderr.exp dlclose_leak-no-keep.stdout.exp \
++ dlclose_leak-no-keep.vgtest \
++ dlclose_leak.stderr.exp dlclose_leak.stdout.exp \
++ dlclose_leak.vgtest \
+ ioctl-tiocsig.vgtest ioctl-tiocsig.stderr.exp \
+ lsframe1.vgtest lsframe1.stdout.exp lsframe1.stderr.exp \
+ lsframe2.vgtest lsframe2.stdout.exp lsframe2.stderr.exp \
+@@ -25,6 +29,7 @@ EXTRA_DIST = \
+ check_PROGRAMS = \
+ brk \
+ capget \
++ dlclose_leak dlclose_leak_so.so \
+ ioctl-tiocsig \
+ getregset \
+ lsframe1 \
+@@ -48,3 +53,15 @@ AM_CXXFLAGS += $(AM_FLAG_M3264_PRI)
+ stack_switch_LDADD = -lpthread
+ timerfd_syscall_LDADD = -lrt
+
++# Build shared object for dlclose_leak
++dlclose_leak_so_so_SOURCES = dlclose_leak_so.c
++dlclose_leak_so_so_CFLAGS = $(AM_CFLAGS) -fpic -g -O0
++dlclose_leak_so_so_LDFLAGS = -fpic $(AM_FLAG_M3264_PRI) -shared -Wl,-soname \
++ -Wl,dlclose_leak_so.so
++
++dlclose_leak_SOURCES = dlclose_leak.c
++dlclose_leak_DEPENDENCIES = dlclose_leak_so.so
++dlclose_leak_LDADD = dlclose_leak_so.so
++dlclose_leak_LDFLAGS = $(AM_FLAG_M3264_PRI) \
++ -ldl \
++ -Wl,-rpath,$(top_builddir)/memcheck/tests/linux
+Index: valgrind-3.13.0/memcheck/tests/linux/dlclose_leak-no-keep.stderr.exp
+===================================================================
+--- /dev/null
++++ valgrind-3.13.0/memcheck/tests/linux/dlclose_leak-no-keep.stderr.exp
+@@ -0,0 +1,30 @@
++
++Conditional jump or move depends on uninitialised value(s)
++ ...
++
++Invalid read of size 1
++ ...
++ Address 0x........ is 1 bytes before a block of size 1 alloc'd
++ at 0x........: malloc (vg_replace_malloc.c:...)
++ ...
++
++done!
++
++HEAP SUMMARY:
++ in use at exit: 1 bytes in 1 blocks
++ total heap usage: 4 allocs, 3 frees, 123 bytes allocated
++
++1 bytes in 1 blocks are definitely lost in loss record ... of ...
++ at 0x........: malloc (vg_replace_malloc.c:...)
++ ...
++
++LEAK SUMMARY:
++ definitely lost: 1 bytes in 1 blocks
++ indirectly lost: 0 bytes in 0 blocks
++ possibly lost: 0 bytes in 0 blocks
++ still reachable: 0 bytes in 0 blocks
++ suppressed: 0 bytes in 0 blocks
++
++For counts of detected and suppressed errors, rerun with: -v
++Use --track-origins=yes to see where uninitialised values come from
++ERROR SUMMARY: 3 errors from 3 contexts (suppressed: 0 from 0)
+Index: valgrind-3.13.0/memcheck/tests/linux/dlclose_leak-no-keep.vgtest
+===================================================================
+--- /dev/null
++++ valgrind-3.13.0/memcheck/tests/linux/dlclose_leak-no-keep.vgtest
+@@ -0,0 +1,3 @@
++prog: dlclose_leak
++stderr_filter: ../filter_stderr
++vgopts: --leak-check=yes --keep-debuginfo=no
+Index: valgrind-3.13.0/memcheck/tests/linux/dlclose_leak.c
+===================================================================
+--- /dev/null
++++ valgrind-3.13.0/memcheck/tests/linux/dlclose_leak.c
+@@ -0,0 +1,32 @@
++/* Test reporting of memory leaks in objects that have been dlopen'ed.
++ * File: dlclose_leak.c */
++
++#include <stdio.h>
++#include <stdlib.h>
++#include <dlfcn.h>
++#include <assert.h>
++
++int (*jmp_on_uninit)(void);
++char* (*alloc_1_byte)(void);
++
++int main(int argc, char** argv) {
++ char* memToLeak;
++ char x;
++ void* handle = dlopen("./dlclose_leak_so.so", RTLD_NOW);
++ if(!handle) {
++ printf("FAILURE to dlopen dlclose_leak_so.so\n");
++ return EXIT_FAILURE;
++ }
++ jmp_on_uninit = dlsym(handle,"jmp_on_uninit");
++ //fprintf(stderr, "jmp_on_uninit: %p\n", jmp_on_uninit);
++ assert(jmp_on_uninit);
++ alloc_1_byte = dlsym(handle,"alloc_1_byte");
++ //fprintf(stderr, "alloc_1_byte: %p\n", alloc_1_byte);
++ assert(alloc_1_byte);
++ (void)jmp_on_uninit();
++ memToLeak = alloc_1_byte();
++ dlclose(handle);
++ x = memToLeak[-1];
++ fprintf(stderr, "done!\n");
++ return (EXIT_SUCCESS);
++}
+Index: valgrind-3.13.0/memcheck/tests/linux/dlclose_leak.stderr.exp
+===================================================================
+--- /dev/null
++++ valgrind-3.13.0/memcheck/tests/linux/dlclose_leak.stderr.exp
+@@ -0,0 +1,33 @@
++
++Conditional jump or move depends on uninitialised value(s)
++ at 0x........: jmp_on_uninit (dlclose_leak_so.c:10)
++ by 0x........: main (dlclose_leak.c:26)
++
++Invalid read of size 1
++ at 0x........: main (dlclose_leak.c:29)
++ Address 0x........ is 1 bytes before a block of size 1 alloc'd
++ at 0x........: malloc (vg_replace_malloc.c:...)
++ by 0x........: alloc_1_byte (dlclose_leak_so.c:20)
++ by 0x........: main (dlclose_leak.c:27)
++
++done!
++
++HEAP SUMMARY:
++ in use at exit: 1 bytes in 1 blocks
++ total heap usage: 4 allocs, 3 frees, 123 bytes allocated
++
++1 bytes in 1 blocks are definitely lost in loss record ... of ...
++ at 0x........: malloc (vg_replace_malloc.c:...)
++ by 0x........: alloc_1_byte (dlclose_leak_so.c:20)
++ by 0x........: main (dlclose_leak.c:27)
++
++LEAK SUMMARY:
++ definitely lost: 1 bytes in 1 blocks
++ indirectly lost: 0 bytes in 0 blocks
++ possibly lost: 0 bytes in 0 blocks
++ still reachable: 0 bytes in 0 blocks
++ suppressed: 0 bytes in 0 blocks
++
++For counts of detected and suppressed errors, rerun with: -v
++Use --track-origins=yes to see where uninitialised values come from
++ERROR SUMMARY: 3 errors from 3 contexts (suppressed: 0 from 0)
+Index: valgrind-3.13.0/memcheck/tests/linux/dlclose_leak.vgtest
+===================================================================
+--- /dev/null
++++ valgrind-3.13.0/memcheck/tests/linux/dlclose_leak.vgtest
+@@ -0,0 +1,3 @@
++prog: dlclose_leak
++stderr_filter: ../filter_stderr
++vgopts: --leak-check=yes --keep-debuginfo=yes
+Index: valgrind-3.13.0/memcheck/tests/linux/dlclose_leak_so.c
+===================================================================
+--- /dev/null
++++ valgrind-3.13.0/memcheck/tests/linux/dlclose_leak_so.c
+@@ -0,0 +1,21 @@
++/* dlclose_leak_so.c */
++
++#include <stdlib.h>
++
++/** Makes a jump based on an uninitialized variable in order to make sure
++ * errors reported while the dlopen'ed object is loaded work. */
++int jmp_on_uninit(void) {
++ int uninit[27];
++ __asm__ __volatile("":::"cc","memory");
++ if(uninit[13]) {
++ return 1;
++ } else {
++ return 0;
++ }
++}
++
++/** Leak 1 byte of memory. This is to test the stack check reported after the
++ * object has been dlclose'd. */
++char* alloc_1_byte(void) {
++ return (char*)malloc(1);
++}
+Index: valgrind-3.13.0/none/tests/cmdline1.stdout.exp
+===================================================================
+--- valgrind-3.13.0.orig/none/tests/cmdline1.stdout.exp
++++ valgrind-3.13.0/none/tests/cmdline1.stdout.exp
+@@ -42,6 +42,10 @@ usage: valgrind [options] prog-and-args
+ --error-exitcode=<number> exit code to return if errors found [0=disable]
+ --error-markers=<begin>,<end> add lines with begin/end markers before/after
+ each error output in plain text mode [none]
++ --keep-debuginfo=no|yes Keep symbols etc for unloaded code [no]
++ This allows stack traces for memory leaks to
++ include file/line info for code that has been
++ dlclose'd (or similar)
+ --show-below-main=no|yes continue stack traces below main() [no]
+ --default-suppressions=yes|no
+ load default suppressions [yes]
+Index: valgrind-3.13.0/none/tests/cmdline2.stdout.exp
+===================================================================
+--- valgrind-3.13.0.orig/none/tests/cmdline2.stdout.exp
++++ valgrind-3.13.0/none/tests/cmdline2.stdout.exp
+@@ -42,6 +42,10 @@ usage: valgrind [options] prog-and-args
+ --error-exitcode=<number> exit code to return if errors found [0=disable]
+ --error-markers=<begin>,<end> add lines with begin/end markers before/after
+ each error output in plain text mode [none]
++ --keep-debuginfo=no|yes Keep symbols etc for unloaded code [no]
++ This allows stack traces for memory leaks to
++ include file/line info for code that has been
++ dlclose'd (or similar)
+ --show-below-main=no|yes continue stack traces below main() [no]
+ --default-suppressions=yes|no
+ load default suppressions [yes]
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