//
// The LLVM Compiler Infrastructure
//
-// This file was developed by Chris Lattner and is distributed under the
-// University of Illinois Open Source License. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-//
-// This file defines the JITMemoryManagerInterface
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
-#ifndef LLVM_EXECUTION_ENGINE_JIT_H
-#define LLVM_EXECUTION_ENGINE_JIT_H
+#ifndef LLVM_EXECUTIONENGINE_JITMEMORYMANAGER_H
+#define LLVM_EXECUTIONENGINE_JITMEMORYMANAGER_H
+#include "llvm/ExecutionEngine/RuntimeDyld.h"
#include "llvm/Support/DataTypes.h"
+#include <string>
namespace llvm {
+
class Function;
+ class GlobalValue;
/// JITMemoryManager - This interface is used by the JIT to allocate and manage
/// memory for the code generated by the JIT. This can be reimplemented by
/// clients that have a strong desire to control how the layout of JIT'd memory
/// works.
-class JITMemoryManager {
+class JITMemoryManager : public RTDyldMemoryManager {
protected:
bool HasGOT;
+
public:
JITMemoryManager() : HasGOT(false) {}
virtual ~JITMemoryManager();
-
+
/// CreateDefaultMemManager - This is used to create the default
/// JIT Memory Manager if the client does not provide one to the JIT.
static JITMemoryManager *CreateDefaultMemManager();
-
+
+ /// setMemoryWritable - When code generation is in progress,
+ /// the code pages may need permissions changed.
+ virtual void setMemoryWritable() = 0;
+
+ /// setMemoryExecutable - When code generation is done and we're ready to
+ /// start execution, the code pages may need permissions changed.
+ virtual void setMemoryExecutable() = 0;
+
+ /// setPoisonMemory - Setting this flag to true makes the memory manager
+ /// garbage values over freed memory. This is useful for testing and
+ /// debugging, and may be turned on by default in debug mode.
+ virtual void setPoisonMemory(bool poison) = 0;
+
//===--------------------------------------------------------------------===//
// Global Offset Table Management
//===--------------------------------------------------------------------===//
/// method is invoked to allocate it. This method is required to set HasGOT
/// to true.
virtual void AllocateGOT() = 0;
-
+
/// isManagingGOT - Return true if the AllocateGOT method is called.
- ///
bool isManagingGOT() const {
return HasGOT;
}
-
+
/// getGOTBase - If this is managing a Global Offset Table, this method should
/// return a pointer to its base.
- virtual unsigned char *getGOTBase() const = 0;
-
+ virtual uint8_t *getGOTBase() const = 0;
+
//===--------------------------------------------------------------------===//
// Main Allocation Functions
//===--------------------------------------------------------------------===//
-
- /// startFunctionBody - When we start JITing a function, the JIT calls this
+
+ /// startFunctionBody - When we start JITing a function, the JIT calls this
/// method to allocate a block of free RWX memory, which returns a pointer to
- /// it. The JIT doesn't know ahead of time how much space it will need to
- /// emit the function, so it doesn't pass in the size. Instead, this method
- /// is required to pass back a "valid size". The JIT will be careful to not
- /// write more than the returned ActualSize bytes of memory.
- virtual unsigned char *startFunctionBody(const Function *F,
- uintptr_t &ActualSize) = 0;
-
+ /// it. If the JIT wants to request a block of memory of at least a certain
+ /// size, it passes that value as ActualSize, and this method returns a block
+ /// with at least that much space. If the JIT doesn't know ahead of time how
+ /// much space it will need to emit the function, it passes 0 for the
+ /// ActualSize. In either case, this method is required to pass back the size
+ /// of the allocated block through ActualSize. The JIT will be careful to
+ /// not write more than the returned ActualSize bytes of memory.
+ virtual uint8_t *startFunctionBody(const Function *F,
+ uintptr_t &ActualSize) = 0;
+
/// allocateStub - This method is called by the JIT to allocate space for a
/// function stub (used to handle limited branch displacements) while it is
/// JIT compiling a function. For example, if foo calls bar, and if bar
/// thunk for it. The stub should be "close" to the current function body,
/// but should not be included in the 'actualsize' returned by
/// startFunctionBody.
- virtual unsigned char *allocateStub(unsigned StubSize, unsigned Alignment) =0;
-
-
+ virtual uint8_t *allocateStub(const GlobalValue* F, unsigned StubSize,
+ unsigned Alignment) = 0;
+
/// endFunctionBody - This method is called when the JIT is done codegen'ing
/// the specified function. At this point we know the size of the JIT
/// compiled function. This passes in FunctionStart (which was returned by
- /// the startFunctionBody method) and FunctionEnd which is a pointer to the
+ /// the startFunctionBody method) and FunctionEnd which is a pointer to the
/// actual end of the function. This method should mark the space allocated
/// and remember where it is in case the client wants to deallocate it.
- virtual void endFunctionBody(const Function *F, unsigned char *FunctionStart,
- unsigned char *FunctionEnd) = 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;
+ virtual void endFunctionBody(const Function *F, uint8_t *FunctionStart,
+ uint8_t *FunctionEnd) = 0;
+
+ /// allocateSpace - Allocate a memory block of the given size. This method
+ /// cannot be called between calls to startFunctionBody and endFunctionBody.
+ 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;
+
+ /// deallocateFunctionBody - Free the specified function body. The argument
+ /// must be the return value from a call to startFunctionBody() that hasn't
+ /// been deallocated yet. This is never called when the JIT is currently
+ /// emitting a function.
+ virtual void deallocateFunctionBody(void *Body) = 0;
+
+ /// CheckInvariants - For testing only. Return true if all internal
+ /// invariants are preserved, or return false and set ErrorStr to a helpful
+ /// error message.
+ virtual bool CheckInvariants(std::string &) {
+ return true;
+ }
+
+ /// GetDefaultCodeSlabSize - For testing only. Returns DefaultCodeSlabSize
+ /// from DefaultJITMemoryManager.
+ virtual size_t GetDefaultCodeSlabSize() {
+ return 0;
+ }
+
+ /// GetDefaultDataSlabSize - For testing only. Returns DefaultCodeSlabSize
+ /// from DefaultJITMemoryManager.
+ virtual size_t GetDefaultDataSlabSize() {
+ return 0;
+ }
+
+ /// GetDefaultStubSlabSize - For testing only. Returns DefaultCodeSlabSize
+ /// from DefaultJITMemoryManager.
+ virtual size_t GetDefaultStubSlabSize() {
+ return 0;
+ }
+
+ /// GetNumCodeSlabs - For testing only. Returns the number of MemoryBlocks
+ /// allocated for code.
+ virtual unsigned GetNumCodeSlabs() {
+ return 0;
+ }
+
+ /// GetNumDataSlabs - For testing only. Returns the number of MemoryBlocks
+ /// allocated for data.
+ virtual unsigned GetNumDataSlabs() {
+ return 0;
+ }
+
+ /// GetNumStubSlabs - For testing only. Returns the number of MemoryBlocks
+ /// allocated for function stubs.
+ virtual unsigned GetNumStubSlabs() {
+ return 0;
+ }
};
} // end namespace llvm.
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