From: NAKAMURA Takumi <geek4civic@gmail.com>
Date: Mon, 30 Aug 2010 14:00:29 +0000 (+0000)
Subject: EE/JIT: Do not invoke parent's ctors/dtors from main()! (PR3897)
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=37ce5650e60979fe3b02cabbd6724cc2c8fe463e;p=oota-llvm.git

EE/JIT: Do not invoke parent's ctors/dtors from main()! (PR3897)

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, by callee, ExecutionEngine::runStaticConstructorsDestructors()
is called before ExecutionEngine::runFunctionAsMain() is called.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112474 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/ExecutionEngine/JIT/Intercept.cpp b/lib/ExecutionEngine/JIT/Intercept.cpp
index b367033d32b..c8872e433f3 100644
--- a/lib/ExecutionEngine/JIT/Intercept.cpp
+++ b/lib/ExecutionEngine/JIT/Intercept.cpp
@@ -89,6 +89,10 @@ static int jit_atexit(void (*Fn)()) {
   return 0;  // Always successful
 }
 
+static int jit_noop() {
+  return 0;
+}
+
 //===----------------------------------------------------------------------===//
 //
 /// getPointerToNamedFunction - This method returns the address of the specified
@@ -104,6 +108,14 @@ void *JIT::getPointerToNamedFunction(const std::string &Name,
     if (Name == "exit") return (void*)(intptr_t)&jit_exit;
     if (Name == "atexit") return (void*)(intptr_t)&jit_atexit;
 
+    // We shuold not invoke parent's ctors/dtors from main()! (PR3897)
+    // 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();
     // If this is an asm specifier, skip the sentinal.
     if (NameStr[0] == 1) ++NameStr;