mirror of
https://github.com/c64scene-ar/llvm-6502.git
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a84983ea72
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7273 91177308-0d34-0410-b5e6-96231b3b80d8
124 lines
3.3 KiB
C++
124 lines
3.3 KiB
C++
//===-- JIT.cpp - LLVM Just in Time Compiler ------------------------------===//
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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/Target/TargetMachine.h"
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#include "llvm/Target/TargetMachineImpls.h"
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#include "llvm/Module.h"
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#include "Support/CommandLine.h"
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// FIXME: REMOVE THIS
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#include "llvm/PassManager.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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/// createJIT - Create an return a new JIT compiler if there is one available
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/// for the current target. Otherwise it returns null.
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///
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ExecutionEngine *ExecutionEngine::createJIT(Module *M, unsigned Config) {
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TargetMachine* (*TargetMachineAllocator)(unsigned) = 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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#ifdef NO_JITS_ENABLED
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return 0;
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#endif
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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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// Allocate a target...
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TargetMachine *Target = (*TargetMachineAllocator)(Config);
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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(M, Target);
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}
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VM::VM(Module *M, TargetMachine *tm) : ExecutionEngine(M), TM(*tm) {
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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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#ifdef ENABLE_SPARC_JIT
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// THIS GOES BEYOND UGLY HACKS
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if (TM.getName() == "UltraSparc-Native") {
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extern Pass *createPreSelectionPass(TargetMachine &TM);
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PassManager PM;
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// Specialize LLVM code for this target machine and then
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// run basic dataflow optimizations on LLVM code.
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PM.add(createPreSelectionPass(TM));
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PM.run(*M);
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}
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#endif
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emitGlobals();
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}
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int VM::run(const std::string &FnName, const std::vector<std::string> &Args) {
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Function *F = getModule().getNamedFunction(FnName);
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if (F == 0) {
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std::cerr << "Could not find function '" << FnName << "' in module!\n";
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return 1;
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}
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int(*PF)(int, char**) = (int(*)(int, char**))getPointerToFunction(F);
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assert(PF != 0 && "Null pointer to function?");
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// Build an argv vector...
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char **Argv = (char**)CreateArgv(Args);
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// Call the main function...
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int Result = PF(Args.size(), Argv);
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// Run any atexit handlers now!
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runAtExitHandlers();
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return Result;
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}
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