mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-08-29 13:29:28 +00:00
JITCodeEmitter and ObjectCodeEmitter. No functional changes yet. Patch by Aaron Gray git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@72631 91177308-0d34-0410-b5e6-96231b3b80d8
136 lines
5.5 KiB
C++
136 lines
5.5 KiB
C++
//===- Target/TargetJITInfo.h - Target Information for JIT ------*- C++ -*-===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This file exposes an abstract interface used by the Just-In-Time code
|
|
// generator to perform target-specific activities, such as emitting stubs. If
|
|
// a TargetMachine supports JIT code generation, it should provide one of these
|
|
// objects through the getJITInfo() method.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#ifndef LLVM_TARGET_TARGETJITINFO_H
|
|
#define LLVM_TARGET_TARGETJITINFO_H
|
|
|
|
#include <cassert>
|
|
#include "llvm/Support/DataTypes.h"
|
|
|
|
namespace llvm {
|
|
class Function;
|
|
class GlobalValue;
|
|
class JITCodeEmitter;
|
|
class MachineRelocation;
|
|
|
|
/// TargetJITInfo - Target specific information required by the Just-In-Time
|
|
/// code generator.
|
|
class TargetJITInfo {
|
|
public:
|
|
virtual ~TargetJITInfo() {}
|
|
|
|
/// replaceMachineCodeForFunction - Make it so that calling the function
|
|
/// whose machine code is at OLD turns into a call to NEW, perhaps by
|
|
/// overwriting OLD with a branch to NEW. This is used for self-modifying
|
|
/// code.
|
|
///
|
|
virtual void replaceMachineCodeForFunction(void *Old, void *New) = 0;
|
|
|
|
/// emitGlobalValueIndirectSym - Use the specified JITCodeEmitter object
|
|
/// to emit an indirect symbol which contains the address of the specified
|
|
/// ptr.
|
|
virtual void *emitGlobalValueIndirectSym(const GlobalValue* GV, void *ptr,
|
|
JITCodeEmitter &JCE) {
|
|
assert(0 && "This target doesn't implement emitGlobalValueIndirectSym!");
|
|
return 0;
|
|
}
|
|
|
|
/// emitFunctionStub - Use the specified JITCodeEmitter object to emit a
|
|
/// small native function that simply calls the function at the specified
|
|
/// address. Return the address of the resultant function.
|
|
virtual void *emitFunctionStub(const Function* F, void *Fn,
|
|
JITCodeEmitter &JCE) {
|
|
assert(0 && "This target doesn't implement emitFunctionStub!");
|
|
return 0;
|
|
}
|
|
|
|
/// emitFunctionStubAtAddr - Use the specified JITCodeEmitter object to
|
|
/// emit a small native function that simply calls Fn. Emit the stub into
|
|
/// the supplied buffer.
|
|
virtual void emitFunctionStubAtAddr(const Function* F, void *Fn,
|
|
void *Buffer, JITCodeEmitter &JCE) {
|
|
assert(0 && "This target doesn't implement emitFunctionStubAtAddr!");
|
|
}
|
|
|
|
/// getPICJumpTableEntry - Returns the value of the jumptable entry for the
|
|
/// specific basic block.
|
|
virtual uintptr_t getPICJumpTableEntry(uintptr_t BB, uintptr_t JTBase) {
|
|
assert(0 && "This target doesn't implement getPICJumpTableEntry!");
|
|
return 0;
|
|
}
|
|
|
|
/// LazyResolverFn - This typedef is used to represent the function that
|
|
/// unresolved call points should invoke. This is a target specific
|
|
/// function that knows how to walk the stack and find out which stub the
|
|
/// call is coming from.
|
|
typedef void (*LazyResolverFn)();
|
|
|
|
/// JITCompilerFn - This typedef is used to represent the JIT function that
|
|
/// lazily compiles the function corresponding to a stub. The JIT keeps
|
|
/// track of the mapping between stubs and LLVM Functions, the target
|
|
/// provides the ability to figure out the address of a stub that is called
|
|
/// by the LazyResolverFn.
|
|
typedef void* (*JITCompilerFn)(void *);
|
|
|
|
/// getLazyResolverFunction - This method is used to initialize the JIT,
|
|
/// giving the target the function that should be used to compile a
|
|
/// function, and giving the JIT the target function used to do the lazy
|
|
/// resolving.
|
|
virtual LazyResolverFn getLazyResolverFunction(JITCompilerFn) {
|
|
assert(0 && "Not implemented for this target!");
|
|
return 0;
|
|
}
|
|
|
|
/// relocate - Before the JIT can run a block of code that has been emitted,
|
|
/// it must rewrite the code to contain the actual addresses of any
|
|
/// referenced global symbols.
|
|
virtual void relocate(void *Function, MachineRelocation *MR,
|
|
unsigned NumRelocs, unsigned char* GOTBase) {
|
|
assert(NumRelocs == 0 && "This target does not have relocations!");
|
|
}
|
|
|
|
|
|
/// allocateThreadLocalMemory - Each target has its own way of
|
|
/// handling thread local variables. This method returns a value only
|
|
/// meaningful to the target.
|
|
virtual char* allocateThreadLocalMemory(size_t size) {
|
|
assert(0 && "This target does not implement thread local storage!");
|
|
return 0;
|
|
}
|
|
|
|
/// needsGOT - Allows a target to specify that it would like the
|
|
/// JIT to manage a GOT for it.
|
|
bool needsGOT() const { return useGOT; }
|
|
|
|
/// hasCustomConstantPool - Allows a target to specify that constant
|
|
/// pool address resolution is handled by the target.
|
|
virtual bool hasCustomConstantPool() const { return false; }
|
|
|
|
/// hasCustomJumpTables - Allows a target to specify that jumptables
|
|
/// are emitted by the target.
|
|
virtual bool hasCustomJumpTables() const { return false; }
|
|
|
|
/// allocateSeparateGVMemory - If true, globals should be placed in
|
|
/// separately allocated heap memory rather than in the same
|
|
/// code memory allocated by JITCodeEmitter.
|
|
virtual bool allocateSeparateGVMemory() const { return false; }
|
|
protected:
|
|
bool useGOT;
|
|
};
|
|
} // End llvm namespace
|
|
|
|
#endif
|