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that has not been JIT'd yet, the callee is put on a list of pending functions to JIT. The call is directed through a stub, which is updated with the address of the function after it has been JIT'd. A new interface for allocating and updating empty stubs is provided. Add support for removing the ModuleProvider the JIT was created with, which would otherwise invalidate the JIT's PassManager, which is initialized with the ModuleProvider's Module. Add support under a new ExecutionEngine flag for emitting the infomration necessary to update Function and GlobalVariable stubs after JITing them, by recording the address of the stub and the name of the GlobalValue. This allows code to be copied from one address space to another, where libraries may live at different virtual addresses, and have the stubs updated with their new correct target addresses. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@64906 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++ -*-===//
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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 <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 GlobalValue;
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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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/// emitGlobalValueIndirectSym - Use the specified MachineCodeEmitter 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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MachineCodeEmitter &MCE) {
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assert(0 && "This target doesn't implement emitGlobalValueIndirectSym!");
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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(const Function* F, void *Fn,
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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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/// emitFunctionStubAtAddr - Use the specified MachineCodeEmitter object to
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/// emit a small native function that simply calls Fn. Emit the stub into
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/// the supplied buffer.
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virtual void emitFunctionStubAtAddr(const Function* F, void *Fn,
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void *Buffer, MachineCodeEmitter &MCE) {
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assert(0 && "This target doesn't implement emitFunctionStubAtAddr!");
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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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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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/// 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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assert(0 && "This target does not implement thread local storage!");
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return 0;
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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 MachineCodeEmitter.
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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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