Add an option to allocate JITed global data separately from code. By

default, this option is not enabled to support clients who rely on
this behavior.

Fixes http://llvm.org/PR4483

A patch to allocate additional memory for globals after we run out is
forthcoming.

Patch by Reid Kleckner!


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@75059 91177308-0d34-0410-b5e6-96231b3b80d8

lib/ExecutionEngine/JIT/JITEmitter.cpp

@@ -527,6 +527,11 @@ namespace {
     /// allocate a new one of the given size.
     virtual void *allocateSpace(uintptr_t Size, unsigned Alignment);
 
+    /// allocateGlobal - Allocate memory for a global.  Unlike allocateSpace,
+    /// this method does not allocate memory in the current output buffer,
+    /// because a global may live longer than the current function.
+    virtual void *allocateGlobal(uintptr_t Size, unsigned Alignment);
+
     virtual void addRelocation(const MachineRelocation &MR) {
       Relocations.push_back(MR);
     }
@@ -1161,6 +1166,11 @@ void* JITEmitter::allocateSpace(uintptr_t Size, unsigned Alignment) {
   return CurBufferPtr;
 }
 
+void* JITEmitter::allocateGlobal(uintptr_t Size, unsigned Alignment) {
+  // Delegate this call through the memory manager.
+  return MemMgr->allocateGlobal(Size, Alignment);
+}
+
 void JITEmitter::emitConstantPool(MachineConstantPool *MCP) {
   if (TheJIT->getJITInfo().hasCustomConstantPool())
     return;