From 0ed8f5b185020aafc549e1fa173f0ad9bea2da3b Mon Sep 17 00:00:00 2001
From: Evan Cheng <evan.cheng@apple.com>
Date: Wed, 24 Sep 2008 16:25:55 +0000
Subject: [PATCH] Add DisableGVCompilation which forces the JIT to assert when
 it tries to allocate space for a GlobalVariable.

llvm-svn: 56557
---
 include/llvm/ExecutionEngine/ExecutionEngine.h | 11 +++++++++++
 lib/ExecutionEngine/ExecutionEngine.cpp        |  1 +
 lib/ExecutionEngine/JIT/JIT.cpp                |  4 ++++
 3 files changed, 16 insertions(+)

diff --git a/include/llvm/ExecutionEngine/ExecutionEngine.h b/include/llvm/ExecutionEngine/ExecutionEngine.h
index edcddde2e39..d4fd0fb19b1 100644
--- a/include/llvm/ExecutionEngine/ExecutionEngine.h
+++ b/include/llvm/ExecutionEngine/ExecutionEngine.h
@@ -65,6 +65,7 @@ class ExecutionEngine {
   const TargetData *TD;
   ExecutionEngineState state;
   bool LazyCompilationDisabled;
+  bool GVCompilationDisabled;
   bool SymbolSearchingDisabled;
 
 protected:
@@ -254,6 +255,16 @@ public:
   bool isLazyCompilationDisabled() const {
     return LazyCompilationDisabled;
   }
+
+  /// DisableGVCompilation - If called, the JIT will abort if it's asked to allocate
+  /// space and populate a GlobalVariable.
+  void DisableGVCompilation(bool Disabled = true) {
+    GVCompilationDisabled = Disabled;
+  }
+  bool isGVCompilationDisabled() const {
+    return GVCompilationDisabled;
+  }
+
   /// DisableSymbolSearching - If called, the JIT will not try to lookup unknown
   /// symbols with dlsym.  A client can still use InstallLazyFunctionCreator to
   /// resolve symbols in a custom way.
diff --git a/lib/ExecutionEngine/ExecutionEngine.cpp b/lib/ExecutionEngine/ExecutionEngine.cpp
index 52a69eaea77..8cc2244272b 100644
--- a/lib/ExecutionEngine/ExecutionEngine.cpp
+++ b/lib/ExecutionEngine/ExecutionEngine.cpp
@@ -40,6 +40,7 @@ ExecutionEngine::EERegisterFn ExecutionEngine::ExceptionTableRegister = 0;
 
 ExecutionEngine::ExecutionEngine(ModuleProvider *P) : LazyFunctionCreator(0) {
   LazyCompilationDisabled = false;
+  GVCompilationDisabled   = false;
   SymbolSearchingDisabled = false;
   Modules.push_back(P);
   assert(P && "ModuleProvider is null?");
diff --git a/lib/ExecutionEngine/JIT/JIT.cpp b/lib/ExecutionEngine/JIT/JIT.cpp
index 39ecc2796c7..383b3804758 100644
--- a/lib/ExecutionEngine/JIT/JIT.cpp
+++ b/lib/ExecutionEngine/JIT/JIT.cpp
@@ -552,6 +552,10 @@ void *JIT::getOrEmitGlobalVariable(const GlobalVariable *GV) {
     addGlobalMapping(GV, Ptr);
     }
   } else {
+    if (isGVCompilationDisabled()) {
+      cerr << "Compilation of GlobalVariable is disabled!\n";
+      abort();
+    }
     // If the global hasn't been emitted to memory yet, allocate space and
     // emit it into memory.  It goes in the same array as the generated
     // code, jump tables, etc.