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[sancov] Don't instrument MSVC CRT stdio config helpers

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They get called before initialization, which is a problem for winasan.

Test coming in compiler-rt.

llvm-svn: 286615
This commit is contained in:
Reid Kleckner 2016-11-11 19:18:45 +00:00
parent 74dd9de11e
commit 1200af0389
1 changed files with 5 additions and 0 deletions
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5
lib/Transforms/Instrumentation/SanitizerCoverage.cpp
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@ -448,6 +448,11 @@ bool SanitizerCoverageModule::runOnFunction(Function &F) {
return false; // Should not instrument sanitizer init functions.
if (F.getName().startswith("__sanitizer_"))
return false; // Don't instrument __sanitizer_* callbacks.
// Don't instrument MSVC CRT configuration helpers. They may run before normal
// initialization.
if (F.getName() == "__local_stdio_printf_options" ||
F.getName() == "__local_stdio_scanf_options")
return false;
// Don't instrument functions using SEH for now. Splitting basic blocks like
// we do for coverage breaks WinEHPrepare.
// FIXME: Remove this when SEH no longer uses landingpad pattern matching.