mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-12-17 18:31:04 +00:00
5913e6c5db
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@49993 91177308-0d34-0410-b5e6-96231b3b80d8
116 lines
5.0 KiB
C++
116 lines
5.0 KiB
C++
//===-- JITMemoryManager.h - Interface JIT uses to Allocate Mem -*- C++ -*-===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This file defines the JITMemoryManagerInterface
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#ifndef LLVM_EXECUTION_ENGINE_JIT_MEMMANAGER_H
|
|
#define LLVM_EXECUTION_ENGINE_JIT_MEMMANAGER_H
|
|
|
|
#include "llvm/Support/DataTypes.h"
|
|
|
|
namespace llvm {
|
|
class Function;
|
|
|
|
/// 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 {
|
|
protected:
|
|
bool HasGOT;
|
|
bool SizeRequired;
|
|
public:
|
|
JITMemoryManager() : HasGOT(false), SizeRequired(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();
|
|
|
|
//===--------------------------------------------------------------------===//
|
|
// Global Offset Table Management
|
|
//===--------------------------------------------------------------------===//
|
|
|
|
/// AllocateGOT - If the current table requires a Global Offset Table, this
|
|
/// 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;
|
|
|
|
/// NeedsExactSize - If the memory manager requires to know the size of the
|
|
/// objects to be emitted
|
|
bool NeedsExactSize() const {
|
|
return SizeRequired;
|
|
}
|
|
|
|
//===--------------------------------------------------------------------===//
|
|
// Main Allocation Functions
|
|
//===--------------------------------------------------------------------===//
|
|
|
|
/// 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;
|
|
|
|
/// 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
|
|
/// either needs to be lazily compiled or is a native function that exists too
|
|
/// far away from the call site to work, this method will be used to make a
|
|
/// 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(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
|
|
/// 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;
|
|
|
|
/// startExceptionTable - When we finished JITing the function, if exception
|
|
/// handling is set, we emit the exception table.
|
|
virtual unsigned char* startExceptionTable(const Function* F,
|
|
uintptr_t &ActualSize) = 0;
|
|
|
|
/// endExceptionTable - This method is called when the JIT is done emitting
|
|
/// the exception table.
|
|
virtual void endExceptionTable(const Function *F, unsigned char *TableStart,
|
|
unsigned char *TableEnd,
|
|
unsigned char* FrameRegister) = 0;
|
|
};
|
|
|
|
} // end namespace llvm.
|
|
|
|
#endif
|