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242978cdee
recompile and relink. This keeps it from failing an assertion when it goes and tries to construct a new MachineFunction for that Function. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@9459 91177308-0d34-0410-b5e6-96231b3b80d8
101 lines
3.4 KiB
C++
101 lines
3.4 KiB
C++
//===-- VM.cpp - LLVM Just in Time Compiler -------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by the LLVM research group and is distributed under
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// the University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This tool implements a just-in-time compiler for LLVM, allowing direct
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// execution of LLVM bytecode in an efficient manner.
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//
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//===----------------------------------------------------------------------===//
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#include "VM.h"
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#include "llvm/Function.h"
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#include "llvm/ModuleProvider.h"
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#include "llvm/CodeGen/MachineFunction.h"
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#include "llvm/CodeGen/MachineCodeEmitter.h"
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#include "llvm/Target/TargetMachine.h"
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VM::~VM() {
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delete MCE;
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delete &TM;
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}
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/// setupPassManager - Initialize the VM PassManager object with all of the
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/// passes needed for the target to generate code.
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///
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void VM::setupPassManager() {
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// Compile LLVM Code down to machine code in the intermediate representation
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if (TM.addPassesToJITCompile(PM)) {
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std::cerr << "lli: target '" << TM.getName()
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<< "' doesn't support JIT compilation!\n";
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abort();
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}
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// Turn the machine code intermediate representation into bytes in memory that
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// may be executed.
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//
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if (TM.addPassesToEmitMachineCode(PM, *MCE)) {
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std::cerr << "lli: target '" << TM.getName()
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<< "' doesn't support machine code emission!\n";
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abort();
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}
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}
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/// runJITOnFunction - Run the FunctionPassManager full of
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/// just-in-time compilation passes on F, hopefully filling in
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/// GlobalAddress[F] with the address of F's machine code.
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///
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void VM::runJITOnFunction (Function *F) {
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static bool isAlreadyCodeGenerating = false;
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assert(!isAlreadyCodeGenerating && "ERROR: RECURSIVE COMPILATION DETECTED!");
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// JIT the function
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isAlreadyCodeGenerating = true;
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PM.run(*F);
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isAlreadyCodeGenerating = false;
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}
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/// getPointerToFunction - This method is used to get the address of the
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/// specified function, compiling it if neccesary.
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///
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void *VM::getPointerToFunction(Function *F) {
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void *&Addr = GlobalAddress[F]; // Check if function already code gen'd
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if (Addr) return Addr;
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// Make sure we read in the function if it exists in this Module
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MP->materializeFunction(F);
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if (F->isExternal())
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return Addr = getPointerToNamedFunction(F->getName());
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runJITOnFunction (F);
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assert(Addr && "Code generation didn't add function to GlobalAddress table!");
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return Addr;
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}
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/// recompileAndRelinkFunction - This method is used to force a function
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/// which has already been compiled, to be compiled again, possibly
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/// after it has been modified. Then the entry to the old copy is overwritten
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/// with a branch to the new copy. If there was no old copy, this acts
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/// just like VM::getPointerToFunction().
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///
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void *VM::recompileAndRelinkFunction(Function *F) {
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void *&Addr = GlobalAddress[F]; // Check if function already code gen'd
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// If it's not already compiled (this is kind of weird) there is no
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// reason to patch it up.
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if (!Addr) { return getPointerToFunction (F); }
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void *OldAddr = Addr;
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Addr = 0;
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MachineFunction::destruct (F);
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runJITOnFunction (F);
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assert(Addr && "Code generation didn't add function to GlobalAddress table!");
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TM.replaceMachineCodeForFunction (OldAddr, Addr);
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return Addr;
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}
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