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that merely add passes. This allows them to be used with either FunctionPassManager or PassManager, or even with a custom new kind of pass manager. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@48256 91177308-0d34-0410-b5e6-96231b3b80d8
105 lines
4.1 KiB
C++
105 lines
4.1 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 <vector>
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#include <cassert>
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#include "llvm/Support/DataTypes.h"
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namespace llvm {
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class Function;
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class MachineBasicBlock;
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class MachineCodeEmitter;
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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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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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/// emitGlobalValueLazyPtr - Use the specified MachineCodeEmitter object to
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/// emit a lazy pointer which contains the address of the specified GV.
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virtual void *emitGlobalValueLazyPtr(void *GV, MachineCodeEmitter &MCE) {
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assert(0 && "This target doesn't implement emitGlobalValueLazyPtr!");
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return 0;
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}
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/// emitFunctionStub - Use the specified MachineCodeEmitter object to emit a
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/// small native function that simply calls the function at the specified
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/// address. Return the address of the resultant function.
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virtual void *emitFunctionStub(void *Fn, MachineCodeEmitter &MCE) {
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assert(0 && "This target doesn't implement emitFunctionStub!");
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return 0;
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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 intptr_t getPICJumpTableEntry(intptr_t BB, intptr_t JTBase) {
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assert(0 && "This target doesn't implement getPICJumpTableEntry!");
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return 0;
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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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assert(0 && "Not implemented for this target!");
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return 0;
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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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/// 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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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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