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94 lines
2.9 KiB
C++
94 lines
2.9 KiB
C++
//===-- TargetSelect.cpp - Target Chooser Code ----------------------------===//
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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 contains the hideously gross code that is currently used to select
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// a particular TargetMachine for the JIT to use. This should obviously be
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// improved in the future, probably by having the TargetMachines register
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// themselves with the runtime, and then have them choose themselves if they
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// match the current machine.
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//
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//===----------------------------------------------------------------------===//
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#include "JIT.h"
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#include "llvm/Module.h"
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#include "llvm/ModuleProvider.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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using namespace llvm;
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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, SparcV9 };
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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(SparcV9, "sparcv9", " 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(SparcV9)
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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 *JIT::create(ModuleProvider *MP, IntrinsicLowering *IL) {
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TargetMachine* (*TargetMachineAllocator)(const Module &,
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IntrinsicLowering *IL) = 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 SparcV9:
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TargetMachineAllocator = allocateSparcV9TargetMachine;
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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(), IL);
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assert(Target && "Could not allocate target machine!");
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// If the target supports JIT code generation, return a new JIT now.
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if (TargetJITInfo *TJ = Target->getJITInfo())
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return new JIT(MP, *Target, *TJ);
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return 0;
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}
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