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[sanitizer-coverage] ensure minimal alignment for coverage counters and guards 

llvm-svn: 309610
This commit is contained in:
Kostya Serebryany 2017-07-31 19:49:45 +00:00
parent 9f6e41cdba
commit bb6f079a45
3 changed files with 4 additions and 1 deletions
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3
llvm/lib/Transforms/Instrumentation/SanitizerCoverage.cpp
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@ -487,6 +487,8 @@ GlobalVariable *SanitizerCoverageModule::CreateFunctionLocalArrayInSection(
if (auto Comdat = F.getComdat())
Array->setComdat(Comdat);
Array->setSection(getSectionName(Section));
Array->setAlignment(Ty->isPointerTy() ? DL->getPointerSize()
: Ty->getPrimitiveSizeInBits() / 8);
return Array;
}
@ -505,7 +507,6 @@ void SanitizerCoverageModule::CreatePCArray(Function &F,
FunctionPCsArray->setInitializer(
ConstantArray::get(ArrayType::get(Int8PtrTy, N), PCs));
FunctionPCsArray->setConstant(true);
FunctionPCsArray->setAlignment(DL->getPointerSize());
}
void SanitizerCoverageModule::CreateFunctionLocalArrays(

1
llvm/test/Instrumentation/SanitizerCoverage/inline-8bit-counters.ll
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@ -5,6 +5,7 @@ target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f3
target triple = "x86_64-unknown-linux-gnu"
define void @foo() {
entry:
; CHECK: section "__sancov_cntrs", align 1
; CHECK: %0 = load i8, i8* getelementptr inbounds ([1 x i8], [1 x i8]* @__sancov_gen_, i64 0, i64 0), !nosanitize
; CHECK: %1 = add i8 %0, 1
; CHECK: store i8 %1, i8* getelementptr inbounds ([1 x i8], [1 x i8]* @__sancov_gen_, i64 0, i64 0), !nosanitize

1
llvm/test/Instrumentation/SanitizerCoverage/tracing.ll
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@ -26,6 +26,7 @@ entry:
; CHECK_PC: ret void
; CHECK_PC-NOT: call void @__sanitizer_cov_module_init
; CHECK_PC_GUARD: section "__sancov_guards", align 4
; CHECK_PC_GUARD-LABEL: define void @foo
; CHECK_PC_GUARD: call void @__sanitizer_cov_trace_pc_guard
; CHECK_PC_GUARD: call void @__sanitizer_cov_trace_pc_guard