2003-12-20 01:46:27 +00:00
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//===-- JIT.cpp - LLVM Just in Time Compiler ------------------------------===//
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2003-10-20 19:43:21 +00:00
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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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2002-12-24 00:01:05 +00:00
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//
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2003-12-20 01:46:27 +00:00
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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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2002-12-24 00:01:05 +00:00
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//
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//===----------------------------------------------------------------------===//
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2003-12-20 01:46:27 +00:00
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#include "JIT.h"
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#include "llvm/Function.h"
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2003-10-16 21:19:34 +00:00
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#include "llvm/ModuleProvider.h"
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2003-12-20 01:46:27 +00:00
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#include "llvm/CodeGen/MachineCodeEmitter.h"
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#include "llvm/CodeGen/MachineFunction.h"
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2003-09-05 19:39:22 +00:00
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#include "llvm/ExecutionEngine/GenericValue.h"
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2002-12-24 00:01:05 +00:00
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#include "llvm/Target/TargetMachine.h"
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2003-12-20 01:46:27 +00:00
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#include "llvm/Target/TargetJITInfo.h"
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2003-12-08 08:06:28 +00:00
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using namespace llvm;
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2003-05-27 21:40:39 +00:00
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2003-12-20 01:46:27 +00:00
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JIT::JIT(ModuleProvider *MP, TargetMachine &tm, TargetJITInfo &tji)
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2003-12-20 01:22:19 +00:00
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: ExecutionEngine(MP), TM(tm), TJI(tji), PM(MP) {
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2002-12-24 00:01:05 +00:00
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setTargetData(TM.getTargetData());
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2003-05-27 21:40:39 +00:00
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// Initialize MCE
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2003-06-02 03:23:16 +00:00
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MCE = createEmitter(*this);
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2003-12-20 01:22:19 +00:00
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2003-12-20 01:46:27 +00:00
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// Compile LLVM Code down to machine code in the intermediate representation
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TJI.addPassesToJITCompile(PM);
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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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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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2003-06-06 06:59:55 +00:00
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2003-05-12 02:14:34 +00:00
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emitGlobals();
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2002-12-24 00:01:05 +00:00
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}
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2003-12-20 01:46:27 +00:00
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JIT::~JIT() {
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delete MCE;
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delete &TM;
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}
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2003-09-05 18:42:01 +00:00
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/// run - Start execution with the specified function and arguments.
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2003-08-21 21:32:12 +00:00
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///
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2003-12-20 01:46:27 +00:00
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GenericValue JIT::run(Function *F, const std::vector<GenericValue> &ArgValues) {
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assert (F && "Function *F was null at entry to run()");
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2002-12-24 00:01:05 +00:00
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2003-09-05 18:42:01 +00:00
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int (*PF)(int, char **, const char **) =
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(int(*)(int, char **, const char **))getPointerToFunction(F);
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assert(PF != 0 && "Pointer to fn's code was null after getPointerToFunction");
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2002-12-24 00:01:05 +00:00
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2003-09-05 18:42:01 +00:00
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// Call the function.
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int ExitCode = PF(ArgValues[0].IntVal, (char **) GVTOP (ArgValues[1]),
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(const char **) GVTOP (ArgValues[2]));
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2003-05-14 13:53:40 +00:00
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// Run any atexit handlers now!
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runAtExitHandlers();
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2003-09-05 18:42:01 +00:00
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GenericValue rv;
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rv.IntVal = ExitCode;
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return rv;
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2002-12-24 00:01:05 +00:00
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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 JIT::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 *JIT::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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// getPointerToFunctionOrStub - If the specified function has been
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// code-gen'd, return a pointer to the function. If not, compile it, or use
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// a stub to implement lazy compilation if available.
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//
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void *JIT::getPointerToFunctionOrStub(Function *F) {
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// If we have already code generated the function, just return the address.
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std::map<const GlobalValue*, void *>::iterator I = GlobalAddress.find(F);
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if (I != GlobalAddress.end()) return I->second;
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// If the target supports "stubs" for functions, get a stub now.
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if (void *Ptr = TJI.getJITStubForFunction(F, *MCE))
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return Ptr;
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// Otherwise, if the target doesn't support it, just codegen the function.
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return getPointerToFunction(F);
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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 JIT::getPointerToFunction().
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///
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void *JIT::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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TJI.replaceMachineCodeForFunction(OldAddr, Addr);
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return Addr;
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}
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