//===-- TargetSelect.cpp - Target Chooser Code ----------------------------===//
-//
+//
// The LLVM Compiler Infrastructure
//
// This file was developed by the LLVM research group and is distributed under
// the University of Illinois Open Source License. See LICENSE.TXT for details.
-//
+//
//===----------------------------------------------------------------------===//
//
-// This file contains the hideously gross code that is currently used to select
-// a particular TargetMachine for the JIT to use. This should obviously be
-// improved in the future, probably by having the TargetMachines register
-// themselves with the runtime, and then have them choose themselves if they
-// match the current machine.
+// This just asks the TargetMachineRegistry for the appropriate JIT to use, and
+// allows the user to specify a specific one on the commandline with -march=x.
//
//===----------------------------------------------------------------------===//
#include "JIT.h"
#include "llvm/Module.h"
#include "llvm/ModuleProvider.h"
+#include "llvm/Target/SubtargetFeature.h"
#include "llvm/Target/TargetMachine.h"
-#include "llvm/Target/TargetMachineImpls.h"
-#include "Support/CommandLine.h"
+#include "llvm/Target/TargetMachineRegistry.h"
using namespace llvm;
-#if !defined(ENABLE_X86_JIT) && !defined(ENABLE_SPARC_JIT)
-#define NO_JITS_ENABLED
-#endif
+static cl::opt<const TargetMachineRegistry::Entry*, false, TargetNameParser>
+MArch("march", cl::desc("Architecture to generate assembly for:"));
-namespace {
- enum ArchName { x86, SparcV9 };
+static cl::opt<std::string>
+MCPU("mcpu",
+ cl::desc("Target a specific cpu type (-mcpu=help for details)"),
+ cl::value_desc("cpu-name"),
+ cl::init(""));
-#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, "sparcv9", " Sparc-V9"),
-#endif
- 0),
-#if defined(ENABLE_X86_JIT)
- cl::init(x86)
-#elif defined(ENABLE_SPARC_JIT)
- cl::init(SparcV9)
-#endif
- );
-#endif /* NO_JITS_ENABLED */
-}
+static cl::list<std::string>
+MAttrs("mattr",
+ cl::CommaSeparated,
+ cl::desc("Target specific attributes (-mattr=help for details)"),
+ cl::value_desc("a1,+a2,-a3,..."));
/// create - Create an return a new JIT compiler if there is one available
/// for the current target. Otherwise, return null.
///
-ExecutionEngine *JIT::create(ModuleProvider *MP, IntrinsicLowering *IL) {
- TargetMachine* (*TargetMachineAllocator)(const Module &,
- IntrinsicLowering *IL) = 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.
-#ifndef NO_JITS_ENABLED
+ExecutionEngine *JIT::create(ModuleProvider *MP, std::string *ErrorStr) {
+ if (MArch == 0) {
+ std::string Error;
+ MArch = TargetMachineRegistry::getClosestTargetForJIT(Error);
+ if (MArch == 0) {
+ if (ErrorStr)
+ *ErrorStr = Error;
+ return 0;
+ }
+ } else if (MArch->JITMatchQualityFn() == 0) {
+ cerr << "WARNING: This target JIT is not designed for the host you are"
+ << " running. If bad things happen, please choose a different "
+ << "-march switch.\n";
+ }
- switch (Arch) {
-#ifdef ENABLE_X86_JIT
- case x86:
- TargetMachineAllocator = allocateX86TargetMachine;
- break;
-#endif
-#ifdef ENABLE_SPARC_JIT
- case SparcV9:
- TargetMachineAllocator = allocateSparcV9TargetMachine;
- break;
-#endif
- default:
- assert(0 && "-march flag not supported on this host!");
+ // Package up features to be passed to target/subtarget
+ std::string FeaturesStr;
+ if (MCPU.size() || MAttrs.size()) {
+ SubtargetFeatures Features;
+ Features.setCPU(MCPU);
+ for (unsigned i = 0; i != MAttrs.size(); ++i)
+ Features.AddFeature(MAttrs[i]);
+ FeaturesStr = Features.getString();
}
-#else
- return 0;
-#endif
// Allocate a target...
- TargetMachine *Target = TargetMachineAllocator(*MP->getModule(), IL);
+ TargetMachine *Target = MArch->CtorFn(*MP->getModule(), FeaturesStr);
assert(Target && "Could not allocate target machine!");
// If the target supports JIT code generation, return a new JIT now.
if (TargetJITInfo *TJ = Target->getJITInfo())
return new JIT(MP, *Target, *TJ);
+
+ if (ErrorStr)
+ *ErrorStr = "target does not support JIT code generation";
return 0;
}
-
-