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lli: [MCJIT] Suppress "__main" for cygming in LLIMCJITMemoryManager::getPointerToNamedFunction(), like legacy JITMemoryManager's. 

CRT's __main (aka premain) invokes global ctors on cygming. See also PR3897.

llvm-svn: 165312
This commit is contained in:
NAKAMURA Takumi 2012-10-05 14:10:23 +00:00
parent 700cd4053a
commit a549b51a32
1 changed files with 12 additions and 0 deletions
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12
llvm/tools/lli/lli.cpp
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@ -338,6 +338,10 @@ void LLIMCJITMemoryManager::invalidateInstructionCache() {
AllocatedCodeMem[i].size());
}
static int jit_noop() {
return 0;
}
void *LLIMCJITMemoryManager::getPointerToNamedFunction(const std::string &Name,
bool AbortOnFailure) {
#if defined(__linux__)
@ -360,6 +364,14 @@ void *LLIMCJITMemoryManager::getPointerToNamedFunction(const std::string &Name,
if (Name == "mknod") return (void*)(intptr_t)&mknod;
#endif // __linux__
// We should not invoke parent's ctors/dtors from generated main()!
// On Mingw and Cygwin, the symbol __main is resolved to
// callee's(eg. tools/lli) one, to invoke wrong duplicated ctors
// (and register wrong callee's dtors with atexit(3)).
// We expect ExecutionEngine::runStaticConstructorsDestructors()
// is called before ExecutionEngine::runFunctionAsMain() is called.
if (Name == "__main") return (void*)(intptr_t)&jit_noop;
const char *NameStr = Name.c_str();
void *Ptr = sys::DynamicLibrary::SearchForAddressOfSymbol(NameStr);
if (Ptr) return Ptr;