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108c838093
way for each TargetJITInfo subclass to allocate its own stubs. This means stubs aren't as exactly-sized anymore, but it lets us get rid of TargetJITInfo::emitFunctionStubAtAddr(), which lets ARM and PPC support the eager JIT, fixing http://llvm.org/PR4816. * Rename the JITEmitter's stub creation functions to describe the kind of stub they create. So far, all of them create lazy-compilation stubs, but they sometimes get used when far-call stubs are needed. Fixing http://llvm.org/PR5201 will involve fixing this. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@89715 91177308-0d34-0410-b5e6-96231b3b80d8
82 lines
3.0 KiB
C++
82 lines
3.0 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/CodeGen/JITCodeEmitter.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 X86Subtarget;
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class X86JITInfo : public TargetJITInfo {
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X86TargetMachine &TM;
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const X86Subtarget *Subtarget;
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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);
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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 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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// getStubLayout - Returns the size and alignment of the largest call stub
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// on X86.
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virtual StubLayout getStubLayout();
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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.
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virtual void *emitFunctionStub(const Function* F, void *Target,
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JITCodeEmitter &JCE);
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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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