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https://github.com/c64scene-ar/llvm-6502.git
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AKA: Recompile *ALL* the source code! This one went much better. No manual edits here. I spot-checked for silliness and grep-checked for really broken edits and everything seemed good. It all still compiles. Yell if you see something that looks goofy. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@169133 91177308-0d34-0410-b5e6-96231b3b80d8
138 lines
5.6 KiB
C++
138 lines
5.6 KiB
C++
//===- Target/TargetJITInfo.h - Target Information for JIT ------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file exposes an abstract interface used by the Just-In-Time code
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// generator to perform target-specific activities, such as emitting stubs. If
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// a TargetMachine supports JIT code generation, it should provide one of these
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// objects through the getJITInfo() method.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_TARGET_TARGETJITINFO_H
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#define LLVM_TARGET_TARGETJITINFO_H
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#include "llvm/Support/DataTypes.h"
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#include "llvm/Support/ErrorHandling.h"
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#include <cassert>
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namespace llvm {
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class Function;
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class GlobalValue;
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class JITCodeEmitter;
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class MachineRelocation;
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/// TargetJITInfo - Target specific information required by the Just-In-Time
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/// code generator.
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class TargetJITInfo {
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virtual void anchor();
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public:
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virtual ~TargetJITInfo() {}
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/// replaceMachineCodeForFunction - Make it so that calling the function
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/// whose machine code is at OLD turns into a call to NEW, perhaps by
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/// overwriting OLD with a branch to NEW. This is used for self-modifying
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/// code.
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///
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virtual void replaceMachineCodeForFunction(void *Old, void *New) = 0;
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/// emitGlobalValueIndirectSym - Use the specified JITCodeEmitter object
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/// to emit an indirect symbol which contains the address of the specified
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/// ptr.
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virtual void *emitGlobalValueIndirectSym(const GlobalValue* GV, void *ptr,
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JITCodeEmitter &JCE) {
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llvm_unreachable("This target doesn't implement "
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"emitGlobalValueIndirectSym!");
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}
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/// Records the required size and alignment for a call stub in bytes.
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struct StubLayout {
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size_t Size;
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size_t Alignment;
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};
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/// Returns the maximum size and alignment for a call stub on this target.
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virtual StubLayout getStubLayout() {
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llvm_unreachable("This target doesn't implement getStubLayout!");
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}
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/// emitFunctionStub - Use the specified JITCodeEmitter object to emit a
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/// small native function that simply calls the function at the specified
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/// address. The JITCodeEmitter must already have storage allocated for the
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/// stub. Return the address of the resultant function, which may have been
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/// aligned from the address the JCE was set up to emit at.
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virtual void *emitFunctionStub(const Function* F, void *Target,
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JITCodeEmitter &JCE) {
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llvm_unreachable("This target doesn't implement emitFunctionStub!");
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}
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/// getPICJumpTableEntry - Returns the value of the jumptable entry for the
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/// specific basic block.
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virtual uintptr_t getPICJumpTableEntry(uintptr_t BB, uintptr_t JTBase) {
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llvm_unreachable("This target doesn't implement getPICJumpTableEntry!");
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}
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/// LazyResolverFn - This typedef is used to represent the function that
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/// unresolved call points should invoke. This is a target specific
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/// function that knows how to walk the stack and find out which stub the
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/// call is coming from.
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typedef void (*LazyResolverFn)();
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/// JITCompilerFn - This typedef is used to represent the JIT function that
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/// lazily compiles the function corresponding to a stub. The JIT keeps
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/// track of the mapping between stubs and LLVM Functions, the target
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/// provides the ability to figure out the address of a stub that is called
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/// by the LazyResolverFn.
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typedef void* (*JITCompilerFn)(void *);
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/// getLazyResolverFunction - This method is used to initialize the JIT,
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/// giving the target the function that should be used to compile a
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/// function, and giving the JIT the target function used to do the lazy
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/// resolving.
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virtual LazyResolverFn getLazyResolverFunction(JITCompilerFn) {
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llvm_unreachable("Not implemented for this target!");
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}
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/// relocate - Before the JIT can run a block of code that has been emitted,
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/// it must rewrite the code to contain the actual addresses of any
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/// referenced global symbols.
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virtual void relocate(void *Function, MachineRelocation *MR,
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unsigned NumRelocs, unsigned char* GOTBase) {
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assert(NumRelocs == 0 && "This target does not have relocations!");
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}
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/// allocateThreadLocalMemory - Each target has its own way of
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/// handling thread local variables. This method returns a value only
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/// meaningful to the target.
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virtual char* allocateThreadLocalMemory(size_t size) {
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llvm_unreachable("This target does not implement thread local storage!");
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}
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/// needsGOT - Allows a target to specify that it would like the
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/// JIT to manage a GOT for it.
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bool needsGOT() const { return useGOT; }
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/// hasCustomConstantPool - Allows a target to specify that constant
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/// pool address resolution is handled by the target.
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virtual bool hasCustomConstantPool() const { return false; }
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/// hasCustomJumpTables - Allows a target to specify that jumptables
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/// are emitted by the target.
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virtual bool hasCustomJumpTables() const { return false; }
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/// allocateSeparateGVMemory - If true, globals should be placed in
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/// separately allocated heap memory rather than in the same
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/// code memory allocated by JITCodeEmitter.
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virtual bool allocateSeparateGVMemory() const { return false; }
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protected:
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bool useGOT;
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};
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} // End llvm namespace
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#endif
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