[llvm-commits] [llvm] r165312 - /llvm/trunk/tools/lli/lli.cpp

[NAKAMURA Takumi]

Author: chapuni
Date: Fri Oct  5 09:10:23 2012
New Revision: 165312

URL: http://llvm.org/viewvc/llvm-project?rev=165312&view=rev
Log:
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.

Modified:
    llvm/trunk/tools/lli/lli.cpp

Modified: llvm/trunk/tools/lli/lli.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/tools/lli/lli.cpp?rev=165312&r1=165311&r2=165312&view=diff
==============================================================================
--- llvm/trunk/tools/lli/lli.cpp (original)
+++ llvm/trunk/tools/lli/lli.cpp Fri Oct  5 09:10:23 2012
@@ -338,6 +338,10 @@
                                             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 @@
   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;