[MCJIT] Call materializeAll on modules before compiling them in MCJIT.

This only affects modules with lazy GVMaterializers attached (usually modules
read off disk using the lazy bitcode reader). For such modules, materializing
before compiling prevents crashes due to missing function bodies /
initializers.

llvm-svn: 334535

1 files changed, 6 insertions, 0 deletions

diff --git a/llvm/lib/ExecutionEngine/MCJIT/MCJIT.cpp b/llvm/lib/ExecutionEngine/MCJIT/MCJIT.cpp
index 82647ea9440..2c663c2e1ed 100644
--- a/llvm/lib/ExecutionEngine/MCJIT/MCJIT.cpp
+++ b/llvm/lib/ExecutionEngine/MCJIT/MCJIT.cpp
@@ -142,8 +142,14 @@ void MCJIT::setObjectCache(ObjectCache* NewCache) {
 }
 
 std::unique_ptr<MemoryBuffer> MCJIT::emitObject(Module *M) {
+  assert(M && "Can not emit a null module");
+
   MutexGuard locked(lock);
 
+  // Materialize all globals in the module if they have not been
+  // materialized already.
+  cantFail(M->materializeAll());
+
   // This must be a module which has already been added but not loaded to this
   // MCJIT instance, since these conditions are tested by our caller,
   // generateCodeForModule.