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