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[dfsan] Handle bitcast aliases.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@212668 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Peter Collingbourne 2014-07-10 01:30:39 +00:00
parent 515f228ec3
commit 706cbb3337
2 changed files with 10 additions and 2 deletions
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4
lib/Transforms/Instrumentation/DataFlowSanitizer.cpp
View File

@ -602,7 +602,7 @@ bool DataFlowSanitizer::runOnModule(Module &M) {
++i;
// Don't stop on weak. We assume people aren't playing games with the
// instrumentedness of overridden weak aliases.
if (Function *F = dyn_cast<Function>(GA->getAliasee())) {
if (auto F = dyn_cast<Function>(GA->getBaseObject())) {
bool GAInst = isInstrumented(GA), FInst = isInstrumented(F);
if (GAInst && FInst) {
addGlobalNamePrefix(GA);
@ -612,7 +612,7 @@ bool DataFlowSanitizer::runOnModule(Module &M) {
// below will take care of instrumenting it.
Function *NewF =
buildWrapperFunction(F, "", GA->getLinkage(), F->getFunctionType());
GA->replaceAllUsesWith(NewF);
GA->replaceAllUsesWith(ConstantExpr::getBitCast(NewF, GA->getType()));
NewF->takeName(GA);
GA->eraseFromParent();
FnsToInstrument.push_back(NewF);

8
test/Instrumentation/DataFlowSanitizer/prefix-rename.ll
View File

@ -8,7 +8,15 @@ module asm ".symver f1,f@@version1"
; CHECK: @"dfs$f2" = alias {{.*}} @"dfs$f1"
@f2 = alias void ()* @f1
; CHECK: @"dfs$g2" = alias {{.*}} @"dfs$g1"
@g2 = alias bitcast (void (i8*)* @g1 to void (i16*)*)
; CHECK: define void @"dfs$f1"
define void @f1() {
ret void
}
; CHECK: define void @"dfs$g1"
define void @g1(i8*) {
ret void
}