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[asan] change the coverage collection scheme so that we can easily emit coverage for the entire process as a single bit set, and if coverage_bitset=1 actually emit that bitset

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@224789 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Kostya Serebryany 2014-12-23 22:32:17 +00:00
parent c9e5247ea7
commit b69d796590
4 changed files with 33 additions and 21 deletions
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36
lib/Transforms/Instrumentation/SanitizerCoverage.cpp
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@ -10,10 +10,10 @@
// Coverage instrumentation that works with AddressSanitizer
// and potentially with other Sanitizers.
//
// We create a Guard boolean variable with the same linkage
// We create a Guard variable with the same linkage
// as the function and inject this code into the entry block (CoverageLevel=1)
// or all blocks (CoverageLevel>=2):
// if (Guard) {
// if (Guard < 0) {
// __sanitizer_cov(&Guard);
// }
// The accesses to Guard are atomic. The rest of the logic is
@ -112,6 +112,8 @@ class SanitizerCoverageModule : public ModulePass {
Type *IntptrTy;
LLVMContext *C;
SmallVector<Constant *, 16> Guards;
int CoverageLevel;
};
@ -134,6 +136,8 @@ bool SanitizerCoverageModule::runOnModule(Module &M) {
IntptrTy = Type::getIntNTy(*C, DLP->getDataLayout().getPointerSizeInBits());
Type *VoidTy = Type::getVoidTy(*C);
IRBuilder<> IRB(*C);
Type *Int32PtrTy = PointerType::getUnqual(IRB.getInt32Ty());
Type *Int32PtrPtrTy = PointerType::getUnqual(Int32PtrTy);
Function *CtorFunc =
Function::Create(FunctionType::get(VoidTy, false),
@ -142,11 +146,12 @@ bool SanitizerCoverageModule::runOnModule(Module &M) {
appendToGlobalCtors(M, CtorFunc, kSanCtorAndDtorPriority);
SanCovFunction = checkInterfaceFunction(
M.getOrInsertFunction(kSanCovName, VoidTy, IRB.getInt8PtrTy(), nullptr));
M.getOrInsertFunction(kSanCovName, VoidTy, Int32PtrTy, nullptr));
SanCovIndirCallFunction = checkInterfaceFunction(M.getOrInsertFunction(
kSanCovIndirCallName, VoidTy, IntptrTy, IntptrTy, nullptr));
SanCovModuleInit = checkInterfaceFunction(M.getOrInsertFunction(
kSanCovModuleInitName, Type::getVoidTy(*C), IntptrTy, nullptr));
SanCovModuleInit = checkInterfaceFunction(
M.getOrInsertFunction(kSanCovModuleInitName, Type::getVoidTy(*C),
Int32PtrPtrTy, IntptrTy, nullptr));
SanCovModuleInit->setLinkage(Function::ExternalLinkage);
// We insert an empty inline asm after cov callbacks to avoid callback merge.
EmptyAsm = InlineAsm::get(FunctionType::get(IRB.getVoidTy(), false),
@ -163,9 +168,15 @@ bool SanitizerCoverageModule::runOnModule(Module &M) {
for (auto &F : M)
runOnFunction(F);
ArrayType *ArrayOfInt32PtrTy = ArrayType::get(Int32PtrTy, Guards.size());
IRB.SetInsertPoint(CtorFunc->getEntryBlock().getTerminator());
IRB.CreateCall(SanCovModuleInit,
ConstantInt::get(IntptrTy, SanCovFunction->getNumUses()));
GlobalVariable *AllGuards = new GlobalVariable(
M, ArrayOfInt32PtrTy, false, GlobalVariable::InternalLinkage,
ConstantArray::get(ArrayOfInt32PtrTy, Guards), "");
assert(SanCovFunction->getNumUses() == Guards.size());
IRB.CreateCall2(SanCovModuleInit,
IRB.CreatePointerCast(AllGuards, Int32PtrPtrTy),
ConstantInt::get(IntptrTy, Guards.size()));
return true;
}
@ -271,16 +282,16 @@ void SanitizerCoverageModule::InjectCoverageAtBlock(Function &F,
: IP->getDebugLoc();
IRBuilder<> IRB(IP);
IRB.SetCurrentDebugLocation(EntryLoc);
Type *Int8Ty = IRB.getInt8Ty();
Type *Int32Ty = IRB.getInt32Ty();
GlobalVariable *Guard = new GlobalVariable(
*F.getParent(), Int8Ty, false, GlobalValue::PrivateLinkage,
Constant::getNullValue(Int8Ty), "__sancov_gen_cov_" + F.getName());
*F.getParent(), Int32Ty, false, GlobalValue::PrivateLinkage,
Constant::getNullValue(Int32Ty), "__sancov_gen_cov_" + F.getName());
LoadInst *Load = IRB.CreateLoad(Guard);
Load->setAtomic(Monotonic);
Load->setAlignment(1);
Load->setAlignment(4);
Load->setMetadata(F.getParent()->getMDKindID("nosanitize"),
MDNode::get(*C, None));
Value *Cmp = IRB.CreateICmpEQ(Constant::getNullValue(Int8Ty), Load);
Value *Cmp = IRB.CreateICmpSGE(Constant::getNullValue(Int32Ty), Load);
Instruction *Ins = SplitBlockAndInsertIfThen(
Cmp, IP, false, MDBuilder(*C).createBranchWeights(1, 100000));
IRB.SetInsertPoint(Ins);
@ -288,6 +299,7 @@ void SanitizerCoverageModule::InjectCoverageAtBlock(Function &F,
// __sanitizer_cov gets the PC of the instruction using GET_CALLER_PC.
IRB.CreateCall(SanCovFunction, Guard);
IRB.CreateCall(EmptyAsm); // Avoids callback merge.
Guards.push_back(Guard); // Save the guard for later.
}
char SanitizerCoverageModule::ID = 0;

2
test/Instrumentation/SanitizerCoverage/coverage-dbg.ll
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@ -15,7 +15,7 @@
; and add sanitize_address to @_ZN1A1fEv
; Test that __sanitizer_cov call has !dbg pointing to the opening { of A::f().
; CHECK: call void @__sanitizer_cov(i8*{{.*}}), !dbg [[A:!.*]]
; CHECK: call void @__sanitizer_cov(i32*{{.*}}), !dbg [[A:!.*]]
; CHECK: [[A]] = !{i32 6, i32 0, !{{.*}}, null}

10
test/Instrumentation/SanitizerCoverage/coverage.ll
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@ -33,17 +33,17 @@ entry:
; CHECK0-NOT: call void @__sanitizer_cov_module_init(
; CHECK1-LABEL: define void @foo
; CHECK1: %0 = load atomic i8* @__sancov_gen_cov_foo monotonic, align 1, !nosanitize
; CHECK1: %1 = icmp eq i8 0, %0
; CHECK1: %0 = load atomic i32* @__sancov_gen_cov_foo monotonic, align 4, !nosanitize
; CHECK1: %1 = icmp sge i32 0, %0
; CHECK1: br i1 %1, label %2, label %3
; CHECK1: call void @__sanitizer_cov(i8*{{.*}})
; CHECK1: call void @__sanitizer_cov(i32*{{.*}})
; CHECK1: call void asm sideeffect "", ""()
; CHECK1-NOT: call void @__sanitizer_cov
; CHECK1: ret void
; CHECK1-LABEL: define internal void @sancov.module_ctor
; CHECK1-NOT: ret
; CHECK1: call void @__sanitizer_cov_module_init(i64 2)
; CHECK1: call void @__sanitizer_cov_module_init({{.*}}, i64 2)
; CHECK1: ret
@ -59,7 +59,7 @@ entry:
; CHECK2-LABEL: define internal void @sancov.module_ctor
; CHECK2-NOT: ret
; CHECK2: call void @__sanitizer_cov_module_init(i64 4)
; CHECK2: call void @__sanitizer_cov_module_init({{.*}}, i64 4)
; CHECK2: ret
; CHECK3-LABEL: define void @foo

6
test/Instrumentation/SanitizerCoverage/coverage2-dbg.ll
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@ -17,9 +17,9 @@ target triple = "x86_64-unknown-linux-gnu"
; Check that __sanitizer_cov call has !dgb pointing to the beginning
; of appropriate basic blocks.
; CHECK-LABEL:_Z3fooPi
; CHECK: call void @__sanitizer_cov(i8*{{.*}}), !dbg [[A:!.*]]
; CHECK: call void @__sanitizer_cov(i8*{{.*}}), !dbg [[B:!.*]]
; CHECK: call void @__sanitizer_cov(i8*{{.*}}), !dbg [[C:!.*]]
; CHECK: call void @__sanitizer_cov(i32*{{.*}}), !dbg [[A:!.*]]
; CHECK: call void @__sanitizer_cov(i32*{{.*}}), !dbg [[B:!.*]]
; CHECK: call void @__sanitizer_cov(i32*{{.*}}), !dbg [[C:!.*]]
; CHECK: ret void
; CHECK: [[A]] = !{i32 1, i32 0, !{{.*}}, null}
; CHECK: [[B]] = !{i32 3, i32 5, !{{.*}}, null}