RPCS3/llvm-mirror
1
0
Fork 0
mirror of https://github.com/RPCS3/llvm-mirror.git synced 2025-01-07 03:40:35 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

Remove what looks like dead code in the production of debug lines.

Browse Source 
We only produce debug line information if we have seen a line directive, so
this code is dead. Also, if we want to be bug by bug compatible with
gas and sometimes produce "empty" .debug_line sections, this will
match the content produced by gas.

llvm-svn: 118914
This commit is contained in:
Rafael Espindola 2010-11-12 18:41:26 +00:00
parent 68d533cca4
commit 77cad43f26
1 changed files with 2 additions and 45 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

47
lib/MC/MCDwarf.cpp
View File

@ -135,7 +135,7 @@ static inline void EmitDwarfSetAddress(MCObjectStreamer *MCOS,
// This emits the Dwarf line table for the specified section from the entries
// in the LineSection.
//
static inline bool EmitDwarfLineTable(MCObjectStreamer *MCOS,
static inline void EmitDwarfLineTable(MCObjectStreamer *MCOS,
const MCSection *Section,
MCLineSection *LineSection,
const MCSection *DwarfLineSection) {
@ -144,7 +144,6 @@ static inline bool EmitDwarfLineTable(MCObjectStreamer *MCOS,
unsigned Column = 0;
unsigned Flags = DWARF2_LINE_DEFAULT_IS_STMT ? DWARF2_FLAG_IS_STMT : 0;
unsigned Isa = 0;
bool EmittedLineTable = false;
MCSymbol *LastLabel = NULL;
MCSectionData &DLS =
MCOS->getAssembler().getOrCreateSectionData(*DwarfLineSection);
@ -202,7 +201,6 @@ static inline bool EmitDwarfLineTable(MCObjectStreamer *MCOS,
LastLine = it->getLine();
LastLabel = Label;
EmittedLineTable = true;
}
// Emit a DW_LNE_end_sequence for the end of the section.
@ -226,8 +224,6 @@ static inline bool EmitDwarfLineTable(MCObjectStreamer *MCOS,
0);
// Create a Dwarf Line fragment for the LineDelta and AddrDelta.
new MCDwarfLineAddrFragment(INT64_MAX, *AddrDelta, &DLS);
return EmittedLineTable;
}
//
@ -315,56 +311,17 @@ void MCDwarfFileTable::Emit(MCObjectStreamer *MCOS,
MCOS->EmitLabel(ProEndSym);
// Put out the line tables.
bool EmittedLineTable = false;
DenseMap<const MCSection *, MCLineSection *> &MCLineSections =
MCOS->getContext().getMCLineSections();
for (DenseMap<const MCSection *, MCLineSection *>::iterator it =
MCLineSections.begin(), ie = MCLineSections.end(); it != ie; ++it) {
EmittedLineTable = EmitDwarfLineTable(MCOS, it->first, it->second,
DwarfLineSection);
EmitDwarfLineTable(MCOS, it->first, it->second, DwarfLineSection);
// Now delete the MCLineSections that were created in MCLineEntry::Make()
// and used to emit the line table.
delete it->second;
}
// If there are no line tables emited then we emit:
// The following DW_LNE_set_address sequence to set the address to zero and
// the DW_LNE_end_sequence.
if (EmittedLineTable == false) {
if (MCOS->getAssembler().getBackend().getPointerSize() == 8) {
// This is the DW_LNE_set_address sequence for 64-bit code.
MCOS->EmitIntValue(0, 1);
MCOS->EmitIntValue(9, 1);
MCOS->EmitIntValue(2, 1);
MCOS->EmitIntValue(0, 1);
MCOS->EmitIntValue(0, 1);
MCOS->EmitIntValue(0, 1);
MCOS->EmitIntValue(0, 1);
MCOS->EmitIntValue(0, 1);
MCOS->EmitIntValue(0, 1);
MCOS->EmitIntValue(0, 1);
MCOS->EmitIntValue(0, 1);
}
else {
// This is the DW_LNE_set_address sequence for 32-bit code.
MCOS->EmitIntValue(0, 1);
MCOS->EmitIntValue(5, 1);
MCOS->EmitIntValue(2, 1);
MCOS->EmitIntValue(0, 1);
MCOS->EmitIntValue(0, 1);
MCOS->EmitIntValue(0, 1);
MCOS->EmitIntValue(0, 1);
}
// Lastly emit the DW_LNE_end_sequence which consists of 3 bytes '00 01 01'
// (00 is the code for extended opcodes, followed by a ULEB128 length of the
// extended opcode (01), and the DW_LNE_end_sequence (01).
MCOS->EmitIntValue(0, 1); // DW_LNS_extended_op
MCOS->EmitIntValue(1, 1); // ULEB128 length of the extended opcode
MCOS->EmitIntValue(1, 1); // DW_LNE_end_sequence
}
// This is the end of the section, so set the value of the symbol at the end
// of this section (that was used in a previous expression).
MCOS->EmitLabel(LineEndSym);