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[asan] don't instrument functions with available_externally linkage. This saves a bit of compile time and reduces the number of redundant global strings generated by asan (https://code.google.com/p/address-sanitizer/issues/detail?id=167)

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llvm-svn: 177250
This commit is contained in:
Kostya Serebryany 2013-03-18 07:33:49 +00:00
parent 9bba6f749a
commit 5c4451cc4b
2 changed files with 13 additions and 0 deletions
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1
lib/Transforms/Instrumentation/AddressSanitizer.cpp
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@ -1095,6 +1095,7 @@ bool AddressSanitizer::maybeInsertAsanInitAtFunctionEntry(Function &F) {
bool AddressSanitizer::runOnFunction(Function &F) {
if (BL->isIn(F)) return false;
if (&F == AsanCtorFunction) return false;
if (F.getLinkage() == GlobalValue::AvailableExternallyLinkage) return false;
DEBUG(dbgs() << "ASAN instrumenting:\n" << F << "\n");
initializeCallbacks(*F.getParent());

12
test/Instrumentation/AddressSanitizer/basic.ll
View File

@ -128,3 +128,15 @@ define void @i80test(i80* %a, i80* %b) nounwind uwtable sanitize_address {
; CHECK: __asan_report_store_n{{.*}}, i64 10)
; CHECK: __asan_report_store_n{{.*}}, i64 10)
; CHECK: ret void
; asan should not instrument functions with available_externally linkage.
define available_externally i32 @f_available_externally(i32* %a) sanitize_address {
entry:
%tmp1 = load i32* %a
ret i32 %tmp1
}
; CHECK: @f_available_externally
; CHECK-NOT: __asan_report
; CHECK: ret i32