4860b98443
Summary: This allows targets to override code generation for some instructions. As an example of override, this also moves ad-hoc instruction filtering for X86 into the X86 ExegesisTarget. Reviewers: gchatelet Subscribers: mgorny, tschuett, llvm-commits Differential Revision: https://reviews.llvm.org/D48587 llvm-svn: 335582
72 lines
2.8 KiB
C++
72 lines
2.8 KiB
C++
//===-- LlvmState.cpp -------------------------------------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#include "LlvmState.h"
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#include "Target.h"
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#include "llvm/ADT/SmallVector.h"
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#include "llvm/MC/MCCodeEmitter.h"
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#include "llvm/MC/MCContext.h"
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#include "llvm/MC/MCFixup.h"
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#include "llvm/MC/MCObjectFileInfo.h"
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#include "llvm/Support/TargetRegistry.h"
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#include "llvm/Support/raw_ostream.h"
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#include "llvm/Target/TargetMachine.h"
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#include "llvm/Target/TargetOptions.h"
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namespace exegesis {
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LLVMState::LLVMState(const std::string &Triple, const std::string &CpuName) {
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std::string Error;
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const llvm::Target *const TheTarget =
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llvm::TargetRegistry::lookupTarget(Triple, Error);
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assert(TheTarget && "unknown target for host");
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const llvm::TargetOptions Options;
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TargetMachine.reset(static_cast<llvm::LLVMTargetMachine *>(
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TheTarget->createTargetMachine(Triple, CpuName, /*Features*/ "", Options,
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llvm::Reloc::Model::Static)));
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TheExegesisTarget = ExegesisTarget::lookup(TargetMachine->getTargetTriple());
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if (!TheExegesisTarget) {
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llvm::errs() << "no exegesis target for " << Triple << ", using default\n";
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TheExegesisTarget = &ExegesisTarget::getDefault();
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}
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}
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LLVMState::LLVMState()
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: LLVMState(llvm::sys::getProcessTriple(),
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llvm::sys::getHostCPUName().str()) {}
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std::unique_ptr<llvm::LLVMTargetMachine>
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LLVMState::createTargetMachine() const {
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return std::unique_ptr<llvm::LLVMTargetMachine>(
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static_cast<llvm::LLVMTargetMachine *>(
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TargetMachine->getTarget().createTargetMachine(
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TargetMachine->getTargetTriple().normalize(),
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TargetMachine->getTargetCPU(),
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TargetMachine->getTargetFeatureString(), TargetMachine->Options,
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llvm::Reloc::Model::Static)));
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}
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bool LLVMState::canAssemble(const llvm::MCInst &Inst) const {
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llvm::MCObjectFileInfo ObjectFileInfo;
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llvm::MCContext Context(TargetMachine->getMCAsmInfo(),
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TargetMachine->getMCRegisterInfo(), &ObjectFileInfo);
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std::unique_ptr<const llvm::MCCodeEmitter> CodeEmitter(
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TargetMachine->getTarget().createMCCodeEmitter(
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*TargetMachine->getMCInstrInfo(), *TargetMachine->getMCRegisterInfo(),
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Context));
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llvm::SmallVector<char, 16> Tmp;
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llvm::raw_svector_ostream OS(Tmp);
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llvm::SmallVector<llvm::MCFixup, 4> Fixups;
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CodeEmitter->encodeInstruction(Inst, OS, Fixups,
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*TargetMachine->getMCSubtargetInfo());
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return Tmp.size() > 0;
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}
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} // namespace exegesis
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