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121 lines
3.3 KiB
C++
121 lines
3.3 KiB
C++
//===-- JIT.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 file implements the top-level support for creating a Just-In-Time
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// compiler for the current architecture.
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//
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//===----------------------------------------------------------------------===//
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#include "VM.h"
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#include "llvm/Module.h"
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#include "llvm/ModuleProvider.h"
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#include "llvm/ExecutionEngine/GenericValue.h"
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#include "llvm/Target/TargetMachine.h"
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#include "llvm/Target/TargetMachineImpls.h"
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#include "Support/CommandLine.h"
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#if !defined(ENABLE_X86_JIT) && !defined(ENABLE_SPARC_JIT)
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#define NO_JITS_ENABLED
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#endif
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namespace {
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enum ArchName { x86, Sparc };
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#ifndef NO_JITS_ENABLED
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cl::opt<ArchName>
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Arch("march", cl::desc("Architecture to JIT to:"), cl::Prefix,
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cl::values(
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#ifdef ENABLE_X86_JIT
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clEnumVal(x86, " IA-32 (Pentium and above)"),
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#endif
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#ifdef ENABLE_SPARC_JIT
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clEnumValN(Sparc, "sparc", " Sparc-V9"),
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#endif
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0),
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#if defined(ENABLE_X86_JIT)
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cl::init(x86)
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#elif defined(ENABLE_SPARC_JIT)
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cl::init(Sparc)
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#endif
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);
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#endif /* NO_JITS_ENABLED */
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}
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/// create - Create an return a new JIT compiler if there is one available
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/// for the current target. Otherwise, return null.
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///
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ExecutionEngine *VM::create(ModuleProvider *MP) {
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TargetMachine* (*TargetMachineAllocator)(const Module &) = 0;
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// Allow a command-line switch to override what *should* be the default target
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// machine for this platform. This allows for debugging a Sparc JIT on X86 --
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// our X86 machines are much faster at recompiling LLVM and linking LLI.
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#ifndef NO_JITS_ENABLED
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switch (Arch) {
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#ifdef ENABLE_X86_JIT
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case x86:
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TargetMachineAllocator = allocateX86TargetMachine;
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break;
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#endif
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#ifdef ENABLE_SPARC_JIT
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case Sparc:
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TargetMachineAllocator = allocateSparcTargetMachine;
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break;
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#endif
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default:
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assert(0 && "-march flag not supported on this host!");
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}
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#else
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return 0;
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#endif
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// Allocate a target...
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TargetMachine *Target = TargetMachineAllocator(*MP->getModule());
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assert(Target && "Could not allocate target machine!");
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// Create the virtual machine object...
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return new VM(MP, Target);
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}
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VM::VM(ModuleProvider *MP, TargetMachine *tm) : ExecutionEngine(MP), TM(*tm),
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PM(MP)
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{
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setTargetData(TM.getTargetData());
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// Initialize MCE
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MCE = createEmitter(*this);
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setupPassManager();
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emitGlobals();
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}
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/// run - Start execution with the specified function and arguments.
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///
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GenericValue VM::run(Function *F, const std::vector<GenericValue> &ArgValues)
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{
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assert (F && "Function *F was null at entry to run()");
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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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// 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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// Run any atexit handlers now!
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runAtExitHandlers();
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GenericValue rv;
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rv.IntVal = ExitCode;
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return rv;
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}
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