[asancov] Don't emit extra runtime calls when compiling without cover…

…age. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@209721 91177308-0d34-0410-b5e6-96231b3b80d8
darkbasic · May 28, 2014 · 0949668 · 0949668
1 parent d8ba67b
commit 0949668
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Showing 2 changed files with 9 additions and 3 deletions.
diff --git a/lib/Transforms/Instrumentation/AddressSanitizer.cpp b/lib/Transforms/Instrumentation/AddressSanitizer.cpp
@@ -1030,9 +1030,11 @@ bool AddressSanitizerModule::runOnModule(Module &M) {
   assert(CtorFunc);
   IRBuilder<> IRB(CtorFunc->getEntryBlock().getTerminator());
 
-  Function *CovFunc = M.getFunction(kAsanCovName);
-  int nCov = CovFunc ? CovFunc->getNumUses() : 0;
-  IRB.CreateCall(AsanCovModuleInit, ConstantInt::get(IntptrTy, nCov));
+  if (ClCoverage > 0) {
+    Function *CovFunc = M.getFunction(kAsanCovName);
+    int nCov = CovFunc ? CovFunc->getNumUses() : 0;
+    IRB.CreateCall(AsanCovModuleInit, ConstantInt::get(IntptrTy, nCov));
+  }
 
   size_t n = GlobalsToChange.size();
   if (n == 0) return false;

diff --git a/test/Instrumentation/AddressSanitizer/coverage.ll b/test/Instrumentation/AddressSanitizer/coverage.ll
@@ -1,3 +1,4 @@
+; RUN: opt < %s -asan -asan-module -asan-coverage=0 -S | FileCheck %s --check-prefix=CHECK0
 ; RUN: opt < %s -asan -asan-module -asan-coverage=1 -S | FileCheck %s --check-prefix=CHECK1
 ; RUN: opt < %s -asan -asan-module -asan-coverage=2 -S | FileCheck %s --check-prefix=CHECK2
 ; RUN: opt < %s -asan -asan-module -asan-coverage=2 -asan-coverage-block-threshold=10 -S | FileCheck %s --check-prefix=CHECK2
@@ -17,6 +18,9 @@ entry:
   ret void
 }
 
+; CHECK0-NOT: call void @__sanitizer_cov(
+; CHECK0-NOT: call void @__sanitizer_cov_module_init(
+
 ; CHECK1-LABEL: define void @foo
 ; CHECK1: %0 = load atomic i8* @__asan_gen_cov_foo monotonic, align 1
 ; CHECK1: %1 = icmp eq i8 0, %0