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DataFlowSanitizer: Replace non-instrumented aliases of instrumented functions, and vice versa, with wrappers.

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Differential Revision: http://llvm-reviews.chandlerc.com/D1442

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@189054 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Peter Collingbourne
2013-08-22 20:08:15 +00:00
parent 4f68e9ea8e
commit 054cec05b8
3 changed files with 28 additions and 4 deletions
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13
lib/Transforms/Instrumentation/DataFlowSanitizer.cpp
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@@ -470,7 +470,8 @@ bool DataFlowSanitizer::runOnModule(Module &M) {
FnsToInstrument.push_back(&*i);
}
// Give function aliases prefixes when necessary.
// Give function aliases prefixes when necessary, and build wrappers where the
// instrumentedness is inconsistent.
for (Module::alias_iterator i = M.alias_begin(), e = M.alias_end(); i != e;) {
GlobalAlias *GA = &*i;
++i;
@@ -481,6 +482,16 @@ bool DataFlowSanitizer::runOnModule(Module &M) {
bool GAInst = isInstrumented(GA), FInst = isInstrumented(F);
if (GAInst && FInst) {
addGlobalNamePrefix(GA);
} else if (GAInst != FInst) {
// Non-instrumented alias of an instrumented function, or vice versa.
// Replace the alias with a native-ABI wrapper of the aliasee. The pass
// below will take care of instrumenting it.
Function *NewF =
buildWrapperFunction(F, "", GA->getLinkage(), F->getFunctionType());
GA->replaceAllUsesWith(NewF);
NewF->takeName(GA);
GA->eraseFromParent();
FnsToInstrument.push_back(NewF);
}
}
}