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//===-- JIT.cpp - LLVM Just in Time Compiler ------------------------------===//
//
// This file implements the top-level support for creating a Just-In-Time
// compiler for the current architecture.
//
//===----------------------------------------------------------------------===//
#include "VM.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/Target/TargetMachineImpls.h"
#include "llvm/Module.h"
#include "Support/CommandLine.h"
#include "Config/stdlib.h"
// FIXME: REMOVE THIS
#include "llvm/PassManager.h"
#if !defined(ENABLE_X86_JIT) && !defined(ENABLE_SPARC_JIT)
#define NO_JITS_ENABLED
#endif
namespace {
enum ArchName { x86, Sparc };
#ifndef NO_JITS_ENABLED
cl::opt<ArchName>
Arch("march", cl::desc("Architecture to JIT to:"), cl::Prefix,
cl::values(
#ifdef ENABLE_X86_JIT
clEnumVal(x86, " IA-32 (Pentium and above)"),
#endif
#ifdef ENABLE_SPARC_JIT
clEnumValN(Sparc, "sparc", " Sparc-V9"),
#endif
0),
#if defined(ENABLE_X86_JIT)
cl::init(x86)
#elif defined(ENABLE_SPARC_JIT)
cl::init(Sparc)
#endif
);
#endif /* NO_JITS_ENABLED */
}
/// createJIT - Create an return a new JIT compiler if there is one available
/// for the current target. Otherwise it returns null.
///
ExecutionEngine *ExecutionEngine::createJIT(Module *M, unsigned Config) {
TargetMachine* (*TargetMachineAllocator)(unsigned) = 0;
// Allow a command-line switch to override what *should* be the default target
// machine for this platform. This allows for debugging a Sparc JIT on X86 --
// our X86 machines are much faster at recompiling LLVM and linking LLI.
#ifdef NO_JITS_ENABLED
return 0;
#endif
switch (Arch) {
#ifdef ENABLE_X86_JIT
case x86:
TargetMachineAllocator = allocateX86TargetMachine;
break;
#endif
#ifdef ENABLE_SPARC_JIT
case Sparc:
TargetMachineAllocator = allocateSparcTargetMachine;
break;
#endif
default:
assert(0 && "-march flag not supported on this host!");
}
// Allocate a target...
TargetMachine *Target = (*TargetMachineAllocator)(Config);
assert(Target && "Could not allocate target machine!");
// Create the virtual machine object...
return new VM(M, Target);
}
VM::VM(Module *M, TargetMachine *tm) : ExecutionEngine(M), TM(*tm) {
setTargetData(TM.getTargetData());
// Initialize MCE
MCE = createEmitter(*this);
setupPassManager();
#ifdef ENABLE_SPARC_JIT
// THIS GOES BEYOND UGLY HACKS
if (TM.getName() == "UltraSparc-Native") {
extern Pass *createPreSelectionPass(TargetMachine &TM);
PassManager PM;
// Specialize LLVM code for this target machine and then
// run basic dataflow optimizations on LLVM code.
PM.add(createPreSelectionPass(TM));
PM.run(*M);
}
#endif
emitGlobals();
}
//
// Method: run()
//
// Description:
// This method begins the execution of a program beginning at the
// specified function name. The function is called with the
// specified arguments and array of environment variables (a la main()).
//
// Inputs:
// FnName - The name of the function as a C++ string.
// Args - A vector of C++ strings containing the arguments.
// envp - An array of C strings containing the environment.
//
// Outputs:
// None.
//
// Return value:
// 1 - An error occurred.
// Otherwise, the return value from the specified function is returned.
//
int VM::run(const std::string &FnName,
const std::vector<std::string> &Args,
const char ** envp) {
Function *F = getModule().getNamedFunction(FnName);
if (F == 0) {
std::cerr << "Could not find function '" << FnName << "' in module!\n";
return 1;
}
int(*PF)(int, char**, const char**) = (int(*)(int, char**, const char**))getPointerToFunction(F);
assert(PF != 0 && "Null pointer to function?");
// Build an argv vector...
char **Argv = (char**)CreateArgv(Args);
// Call the main function...
int Result = PF(Args.size(), Argv, envp);
// Run any atexit handlers now!
runAtExitHandlers();
return Result;
}
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