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

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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
This commit is contained in:
Jeffrey Yasskin
2009-07-08 21:59:57 +00:00
parent e41dec60fa
commit 489393d7b9
12 changed files with 291 additions and 72 deletions
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11
include/llvm/ExecutionEngine/JITMemoryManager.h
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@ -28,6 +28,7 @@ protected:
bool HasGOT;
bool SizeRequired;
public:
JITMemoryManager() : HasGOT(false), SizeRequired(false) {}
virtual ~JITMemoryManager();
@ -43,6 +44,11 @@ public:
/// start execution, the code pages may need permissions changed.
virtual void setMemoryExecutable(void) = 0;
/// setPoisonMemory - Setting this flag to true makes the memory manager
/// garbage values over freed memory. This is useful for testing and
/// debugging, and is be turned on by default in debug mode.
virtual void setPoisonMemory(bool poison) = 0;
//===--------------------------------------------------------------------===//
// Global Offset Table Management
//===--------------------------------------------------------------------===//
@ -114,7 +120,10 @@ public:
/// allocateSpace - Allocate a memory block of the given size.
virtual uint8_t *allocateSpace(intptr_t Size, unsigned Alignment) = 0;
/// allocateGlobal - Allocate memory for a global.
virtual uint8_t *allocateGlobal(uintptr_t Size, unsigned Alignment) = 0;
/// deallocateMemForFunction - Free JIT memory for the specified function.
/// This is never called when the JIT is currently emitting a function.
virtual void deallocateMemForFunction(const Function *F) = 0;