#include "llvm/IR/DataLayout.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/IRBuilder.h"
+#include "llvm/IR/InlineAsm.h"
#include "llvm/IR/LLVMContext.h"
#include "llvm/IR/MDBuilder.h"
#include "llvm/IR/Module.h"
Function *SanCovIndirCallFunction;
Function *SanCovModuleInit;
Function *SanCovTraceEnter, *SanCovTraceBB;
+ InlineAsm *EmptyAsm;
Type *IntptrTy;
LLVMContext *C;
SanCovModuleInit = checkInterfaceFunction(M.getOrInsertFunction(
kSanCovModuleInitName, Type::getVoidTy(*C), 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),
+ StringRef(""), StringRef(""),
+ /*hasSideEffects=*/true);
if (ClExperimentalTracing) {
SanCovTraceEnter = checkInterfaceFunction(
IRB.SetCurrentDebugLocation(EntryLoc);
// __sanitizer_cov gets the PC of the instruction using GET_CALLER_PC.
IRB.CreateCall(SanCovFunction, Guard);
+ IRB.CreateCall(EmptyAsm); // Avoids callback merge.
}
char SanitizerCoverageModule::ID = 0;
; CHECK1: %1 = icmp eq i8 0, %0
; CHECK1: br i1 %1, label %2, label %3
; CHECK1: call void @__sanitizer_cov(i8*{{.*}})
+; CHECK1: call void asm sideeffect "", ""()
; CHECK1-NOT: call void @__sanitizer_cov
; CHECK1: ret void
; CHECK2-LABEL: define void @foo
; CHECK2: call void @__sanitizer_cov
+; CHECK2: call void asm sideeffect "", ""()
; CHECK2: call void @__sanitizer_cov
+; CHECK2: call void asm sideeffect "", ""()
; CHECK2: call void @__sanitizer_cov
+; CHECK2: call void asm sideeffect "", ""()
; CHECK2-NOT: call void @__sanitizer_cov
; CHECK2: ret void