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Final fix for PR 23499 and IR test case.

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This fixes a bit I forgot in r238335. In addition to the data record and
the counter, we can also move the name of the counter to the comdat for
the associated function.

I'm also adding an IR test case to check that these three elements are
placed in the proper comdat.

llvm-svn: 238351
This commit is contained in:
Diego Novillo 2015-05-27 19:34:01 +00:00
parent ce281b5177
commit 913ede308e
2 changed files with 26 additions and 5 deletions
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10
lib/Transforms/Instrumentation/InstrProfiling.cpp
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@ -196,14 +196,17 @@ InstrProfiling::getOrCreateRegionCounters(InstrProfIncrementInst *Inc) {
if (It != RegionCounters.end())
return It->second;
// Move the name variable to the right section.
// Move the name variable to the right section. Make sure it is placed in the
// same comdat as its associated function. Otherwise, we may get multiple
// counters for the same function in certain cases.
Function *Fn = Inc->getParent()->getParent();
Name->setSection(getNameSection());
Name->setAlignment(1);
Name->setComdat(Fn->getComdat());
uint64_t NumCounters = Inc->getNumCounters()->getZExtValue();
LLVMContext &Ctx = M->getContext();
ArrayType *CounterTy = ArrayType::get(Type::getInt64Ty(Ctx), NumCounters);
Function *Fn = Inc->getParent()->getParent();
// Create the counters variable.
auto *Counters = new GlobalVariable(*M, CounterTy, false, Name->getLinkage(),
@ -212,9 +215,6 @@ InstrProfiling::getOrCreateRegionCounters(InstrProfIncrementInst *Inc) {
Counters->setVisibility(Name->getVisibility());
Counters->setSection(getCountersSection());
Counters->setAlignment(8);
// Place the counters in the same comdat section as its parent function.
// Otherwise, we may get multiple counters for the same function in certain
// cases.
Counters->setComdat(Fn->getComdat());
RegionCounters[Inc->getName()] = Counters;

21
test/Instrumentation/InstrProfiling/PR23499.ll Normal file
View File

@ -0,0 +1,21 @@
;; Check that data associated with linkonce odr functions are placed in
;; the same comdat section as their associated function.
; RUN: opt < %s -mtriple=x86_64-apple-macosx10.10.0 -instrprof -S | FileCheck %s
; RUN: opt < %s -mtriple=x86_64-unknown-linux -instrprof -S | FileCheck %s
$_Z3barIvEvv = comdat any
@__llvm_profile_name__Z3barIvEvv = linkonce_odr hidden constant [11 x i8] c"_Z3barIvEvv", align 1
; CHECK: @__llvm_profile_name__Z3barIvEvv = linkonce_odr hidden constant [11 x i8] c"_Z3barIvEvv", section "{{.*}}__llvm_prf_names", comdat($_Z3barIvEvv), align 1
; CHECK: @__llvm_profile_counters__Z3barIvEvv = linkonce_odr hidden global [1 x i64] zeroinitializer, section "{{.*}}__llvm_prf_cnts", comdat($_Z3barIvEvv), align 8
; CHECK: @__llvm_profile_data__Z3barIvEvv = linkonce_odr hidden constant { i32, i32, i64, i8*, i64* } { i32 11, i32 1, i64 0, i8* getelementptr inbounds ([11 x i8], [11 x i8]* @__llvm_profile_name__Z3barIvEvv, i32 0, i32 0), i64* getelementptr inbounds ([1 x i64], [1 x i64]* @__llvm_profile_counters__Z3barIvEvv, i32 0, i32 0) }, section "{{.*}}__llvm_prf_data", comdat($_Z3barIvEvv), align 8
declare void @llvm.instrprof.increment(i8*, i64, i32, i32) #1
define linkonce_odr void @_Z3barIvEvv() comdat {
entry:
call void @llvm.instrprof.increment(i8* getelementptr inbounds ([11 x i8], [11 x i8]* @__llvm_profile_name__Z3barIvEvv, i32 0, i32 0), i64 0, i32 1, i32 0)
ret void
}