in a debug-info-bearing function has a debug location attached to it. Failure to
do so causes an "!dbg attachment points at wrong subprogram for function"
assertion failure when the inliner sets up inline scope info.
rdar://problem/25878916
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@267320 91177308-0d34-0410-b5e6-96231b3b80d8
A long overdue change to make DIGlobalVariable distinct. Much like
DISubprogram definitions (changed in r246098), it isn't logical to
unique DIGlobalVariable definitions from two different compile units.
(Longer-term, we should also find a way to reverse the link between
GlobalVariable and DIGlobalVariable, and between DIGlobalVariable and
DICompileUnit, so that debug info to do with optimized-out globals
disappears. Admittedly it's harder than with Function/DISubprogram,
since global variables may be constant-folded and the debug info should
still describe that somehow.)
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@267301 91177308-0d34-0410-b5e6-96231b3b80d8
Eliminate DITypeIdentifierMap and make DITypeRef a thin wrapper around
DIType*. It is no longer legal to refer to a DICompositeType by its
'identifier:', and DIBuilder no longer retains all types with an
'identifier:' automatically.
Aside from the bitcode upgrade, this is mainly removing logic to resolve
an MDString-based reference to an actualy DIType. The commits leading
up to this have made the implicit type map in DICompileUnit's
'retainedTypes:' field superfluous.
This does not remove DITypeRef, DIScopeRef, DINodeRef, and
DITypeRefArray, or stop using them in DI-related metadata. Although as
of this commit they aren't serving a useful purpose, there are patchces
under review to reuse them for CodeView support.
The tests in LLVM were updated with deref-typerefs.sh, which is attached
to the thread "[RFC] Lazy-loading of debug info metadata":
http://lists.llvm.org/pipermail/llvm-dev/2016-April/098318.html
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@267296 91177308-0d34-0410-b5e6-96231b3b80d8
Each reference to an unresolved MDNode is expensive, since the RAUW
support in MDNode uses a separate allocation and side map. Since
a distinct MDNode doesn't require its operands on creation (unlike
uniuqed nodes, there's no need to check for structural equivalence),
use nullptr for any of its unresolved operands. Besides reducing the
burden on MDNode maps, this can avoid allocating temporary MDNodes in
the first place.
We need some way to track operands. Invent DistinctMDOperandPlaceholder
for this purpose, which is a Metadata subclass that holds an ID and
points at its single user. DistinctMDOperandPlaceholder::replaceUseWith
is just like RAUW, but its name highlights that there is only ever
exactly one use.
There is no support for moving (or, obviously, copying) these. Move
support would be possible but expensive; leaving it unimplemented
prevents user error. In the BitcodeReader I originally considered
allocating on a BumpPtrAllocator and keeping a vector of pointers to
them, and then I realized that std::deque implements exactly this.
A couple of obvious follow-ups:
- Change ValueEnumerator to emit distinct nodes first to take more
advantage of this optimization. (How convenient... I think I might
have a couple of patches for this.)
- Change DIBuilder and its consumers (like CGDebugInfo in clang) to
use something like this when constructing debug info in the first
place.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@267270 91177308-0d34-0410-b5e6-96231b3b80d8
The only functionality change was removing an error check from the
BitcodeReader (and an assertion from DILocation::getImpl) that is
already caught by Verifier::visitDILocation. The Verifier is a better
place for this anyway, and being inconsistent with other subclasses of
MDNode isn't serving anyone.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@267267 91177308-0d34-0410-b5e6-96231b3b80d8
Summary: [u|s]gt and [u|s]lt imply [u|s]ge and [u|s]le are true, respectively.
I've simplified the existing tests and added additional tests to cover the new
cases mentioned above. I've also added tests for all the cases where the
first compare doesn't imply anything about the second compare.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@267171 91177308-0d34-0410-b5e6-96231b3b80d8
We assumed that flags were only present on binary operators. This is
not true, they may also be present on calls and fcmps.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@267113 91177308-0d34-0410-b5e6-96231b3b80d8
EarlyCSE had inconsistent behavior with regards to flag'd instructions:
- In some cases, it would pessimize if the available instruction had
different flags by not performing CSE.
- In other cases, it would miscompile if it replaced an instruction
which had no flags with an instruction which has flags.
Fix this by being more consistent with our flag handling by utilizing
andIRFlags.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@267111 91177308-0d34-0410-b5e6-96231b3b80d8
This patch implements a optimization bisect feature, which will allow optimizations to be selectively disabled at compile time in order to track down test failures that are caused by incorrect optimizations.
The bisection is enabled using a new command line option (-opt-bisect-limit). Individual passes that may be skipped call the OptBisect object (via an LLVMContext) to see if they should be skipped based on the bisect limit. A finer level of control (disabling individual transformations) can be managed through an addition OptBisect method, but this is not yet used.
The skip checking in this implementation is based on (and replaces) the skipOptnoneFunction check. Where that check was being called, a new call has been inserted in its place which checks the bisect limit and the optnone attribute. A new function call has been added for module and SCC passes that behaves in a similar way.
Differential Revision: http://reviews.llvm.org/D19172
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@267022 91177308-0d34-0410-b5e6-96231b3b80d8
Don't use std::vector<TrackingMDRef>, since (at least in some versions
of libc++) std::vector apparently copies values on grow operations
instead of moving them. Found this when I was temporarily deleting the
copy constructor for TrackingMDRef to investigate a performance
bottleneck.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@266909 91177308-0d34-0410-b5e6-96231b3b80d8
No real functionality change here, just avoiding an unnecessary copy of
std::vector<TrackingMDRef> for every subprogram with variables.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@266907 91177308-0d34-0410-b5e6-96231b3b80d8
A ModuleSlotTracker can be created without actually being used (e.g.,
r266889 added one to the Verifier). Create the SlotTracker within it
lazily on the first call to ModuleSlotTracker::getMachine.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@266902 91177308-0d34-0410-b5e6-96231b3b80d8
Speed up Verifier output by sharing a single ModuleSlotTracker for the
duration. There should be no functionality change here except for much
faster output when there's more than one statement.
Now the Verifier won't be traversing the full Metadata graph every time
it prints an error. The TypePrinter is still not shared, but that would
take some extra plumbing.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@266889 91177308-0d34-0410-b5e6-96231b3b80d8
While using a raw_null_ostream meant that the Verifier didn't have to
think about whether to print, it's actually quite expensive to print out
IR. Only print if the output is going somewhere.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@266884 91177308-0d34-0410-b5e6-96231b3b80d8
Summary:
This patch prevents importing from (and therefore exporting from) any
module with a "llvm.used" local value. Local values need to be promoted
and renamed when importing, and their presense on the llvm.used variable
indicates that there are opaque uses that won't see the rename. One such
example is a use in inline assembly.
See also the discussion at:
http://lists.llvm.org/pipermail/llvm-dev/2016-April/098047.html
As part of this, move collectUsedGlobalVariables out of Transforms/Utils
and into IR/Module so that it can be used more widely. There are several
other places in LLVM that used copies of this code that can be cleaned
up as a follow on NFC patch.
Reviewers: joker.eph
Subscribers: pcc, llvm-commits, joker.eph
Differential Revision: http://reviews.llvm.org/D18986
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@266877 91177308-0d34-0410-b5e6-96231b3b80d8
Summary:
LLVMAttribute has outlived its utility and is becoming a problem for C API users that what to use all the LLVM attributes. In order to help moving away from LLVMAttribute in a smooth manner, this diff introduce LLVMGetAttrKindIDInContext, which can be used instead of the enum values.
See D18749 for reference.
Reviewers: Wallbraker, whitequark, joker.eph, echristo, rafael
Subscribers: llvm-commits
Differential Revision: http://reviews.llvm.org/D19081
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@266842 91177308-0d34-0410-b5e6-96231b3b80d8
We never use the set-ness of SmallPtrSet for distinct nodes. Eventually
we may start garbage-collecting or reference-counting nodes (in which
cases we'd want to remove things from this collection, and a fast erase
would be valuable), but in the meantime a vector is sufficient.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@266835 91177308-0d34-0410-b5e6-96231b3b80d8
Both AArch64 and ARM support llvm.<arch>.thread.pointer intrinsics that
just return the thread pointer. I have a pending patch that does the same
for SystemZ (D19054), and there are many more targets that could benefit
from one.
This patch merges the ARM and AArch64 intrinsics into a single target
independent one that will also be used by subsequent targets.
Differential Revision: http://reviews.llvm.org/D19098
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@266818 91177308-0d34-0410-b5e6-96231b3b80d8
Add a new method, DICompositeType::buildODRType, that will create or
mutate the DICompositeType for a given ODR identifier, and use it in
LLParser and BitcodeReader instead of DICompositeType::getODRType.
The logic is as follows:
- If there's no node, create one with the given arguments.
- Else, if the current node is a forward declaration and the new
arguments would create a definition, mutate the node to match the
new arguments.
- Else, return the old node.
This adds a missing feature supported by the current DITypeIdentifierMap
(which I'm slowly making redudant). The only remaining difference is
that the DITypeIdentifierMap has a "the-last-one-wins" rule, whereas
DICompositeType::buildODRType has a "the-first-one-wins" rule.
For now I'm leaving behind DICompositeType::getODRType since it has
obvious, low-level semantics that are convenient for unit testing.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@266786 91177308-0d34-0410-b5e6-96231b3b80d8
Lift the API for debug info ODR type uniquing up a layer. Instead of
clients managing the map directly on the LLVMContext, add a static
method to DICompositeType called getODRType and handle the map in the
background. Also adds DICompositeType::getODRTypeIfExists, so far just
for convenience in the unit tests.
This simplifies the logic in LLParser and BitcodeReader. Because of
argument spam there are actually a few more lines of code now; I'll see
if I come up with a reasonable way to clean that up.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@266742 91177308-0d34-0410-b5e6-96231b3b80d8
Tighten up the API for debug info ODR type uniquing in LLVMContext. The
only reason to allow other DIType subclasses is to make the unit tests
prettier :/.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@266737 91177308-0d34-0410-b5e6-96231b3b80d8
As per David's review, rename everything in the new API for ODR type
uniquing of debug info.
ensureDITypeMap => enableDebugTypeODRUniquing
destroyDITypeMap => disableDebugTypeODRUniquing
hasDITypeMap => isODRUniquingDebugTypes
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@266713 91177308-0d34-0410-b5e6-96231b3b80d8
This remove totally any malloc from this function on my
profile (from 155k before).
From: Mehdi Amini <mehdi.amini@apple.com>
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@266700 91177308-0d34-0410-b5e6-96231b3b80d8
Fix a couple of places in the Verifier that call `getScope()` instead of
`getRawScope()`. Both DIDerivedType::getScope and
DICompositeType::getScope return a DITypeRef right now (which wraps a
Metadata*) so I don't think there's currently an observable bug. I
found this because a future commit that will change them to cast to
DIScope*.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@266552 91177308-0d34-0410-b5e6-96231b3b80d8
Rather than relying on the structural equivalence of DICompositeType to
merge type definitions, use an explicit map on the LLVMContext that
LLParser and BitcodeReader consult when constructing new nodes.
Each non-forward-declaration DICompositeType with a non-empty
'identifier:' field is stored/loaded from the type map, and the first
definiton will "win".
This map is opt-in: clients that expect ODR types from different modules
to be merged must call LLVMContext::ensureDITypeMap.
- Clients that just happen to load more than one Module in the same
LLVMContext won't magically merge types.
- Clients (like LTO) that want to continue to merge types based on ODR
identifiers should opt-in immediately.
I have updated LTOCodeGenerator.cpp, the two "linking" spots in
gold-plugin.cpp, and llvm-link (unless -disable-debug-info-type-map) to
set this.
With this in place, it will be straightforward to remove the DITypeRef
concept (i.e., referencing types by their 'identifier:' string rather
than pointing at them directly).
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@266549 91177308-0d34-0410-b5e6-96231b3b80d8
Merge members that are describing the same member of the same ODR type,
even if other bits differ. If the file or line differ, we don't care;
if anything else differs, it's an ODR violation (and we still don't
really care).
For DISubprogram declarations, this looks at the LinkageName and Scope.
For DW_TAG_member instances of DIDerivedType, this looks at the Name and
Scope. In both cases, we know that the Scope follows ODR rules if it
has a non-empty identifier.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@266548 91177308-0d34-0410-b5e6-96231b3b80d8
This commit has no functionality change, but it adds a configuration
point for MDNodeInfo::isEqual to allow custom uniquing of subclasses of
MDNode, minimizing the diff of a follow-up.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@266542 91177308-0d34-0410-b5e6-96231b3b80d8
To be able to work accurately on the reference graph when taking
decision about internalizing, promoting, renaming, etc. We need
to have the alias information explicit.
Differential Revision: http://reviews.llvm.org/D18836
From: Mehdi Amini <mehdi.amini@apple.com>
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@266517 91177308-0d34-0410-b5e6-96231b3b80d8
1) We need to add this flag prior to adding any other, in case the user has
specified a -fmodule-cache-path= flag in their custom CXXFLAGS. Such a flag
causes -Werror builds to fail, and thus all config checks fail, until we add
the corresponding -fmodules flag. The modules selfhost bot does this, for
instance.
2) Delete module maps that were putting .cpp files into modules.
3) Enable -fmodules-local-submodule-visibility, to get proper module
visibility rules applied across submodules of the same module. Disable
-fmodules for C builds, since that flag is not available there.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@266502 91177308-0d34-0410-b5e6-96231b3b80d8
Currently each Function points to a DISubprogram and DISubprogram has a
scope field. For member functions the scope is a DICompositeType. DIScopes
point to the DICompileUnit to facilitate type uniquing.
Distinct DISubprograms (with isDefinition: true) are not part of the type
hierarchy and cannot be uniqued. This change removes the subprograms
list from DICompileUnit and instead adds a pointer to the owning compile
unit to distinct DISubprograms. This would make it easy for ThinLTO to
strip unneeded DISubprograms and their transitively referenced debug info.
Motivation
----------
Materializing DISubprograms is currently the most expensive operation when
doing a ThinLTO build of clang.
We want the DISubprogram to be stored in a separate Bitcode block (or the
same block as the function body) so we can avoid having to expensively
deserialize all DISubprograms together with the global metadata. If a
function has been inlined into another subprogram we need to store a
reference the block containing the inlined subprogram.
Attached to https://llvm.org/bugs/show_bug.cgi?id=27284 is a python script
that updates LLVM IR testcases to the new format.
http://reviews.llvm.org/D19034
<rdar://problem/25256815>
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@266446 91177308-0d34-0410-b5e6-96231b3b80d8
