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d6b7a242d3
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
84 lines
3.2 KiB
C++
84 lines
3.2 KiB
C++
//===- X86JITInfo.h - X86 implementation of the JIT interface --*- 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 contains the X86 implementation of the TargetJITInfo class.
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//
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//===----------------------------------------------------------------------===//
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#ifndef X86JITINFO_H
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#define X86JITINFO_H
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#include "llvm/Function.h"
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#include "llvm/Target/TargetJITInfo.h"
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namespace llvm {
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class X86TargetMachine;
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class X86JITInfo : public TargetJITInfo {
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X86TargetMachine &TM;
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uintptr_t PICBase;
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char* TLSOffset;
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public:
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explicit X86JITInfo(X86TargetMachine &tm) : TM(tm) {
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useGOT = 0;
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TLSOffset = 0;
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}
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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);
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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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/// 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.
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virtual void *emitFunctionStub(const Function* F, void *Fn,
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MachineCodeEmitter &MCE);
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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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/// 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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/// getLazyResolverFunction - Expose the lazy resolver to the JIT.
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virtual LazyResolverFn getLazyResolverFunction(JITCompilerFn);
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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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/// 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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/// setPICBase / getPICBase - Getter / setter of PICBase, used to compute
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/// PIC jumptable entry.
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void setPICBase(uintptr_t Base) { PICBase = Base; }
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uintptr_t getPICBase() const { return PICBase; }
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};
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}
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#endif
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