X86MCExpr.h
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//=--- X86MCExpr.h - X86 specific MC expression classes ---*- C++ -*-=//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file describes X86-specific MCExprs, i.e, registers used for
// extended variable assignments.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_LIB_TARGET_X86_MCTARGETDESC_X86MCEXPR_H
#define LLVM_LIB_TARGET_X86_MCTARGETDESC_X86MCEXPR_H
#include "X86ATTInstPrinter.h"
#include "llvm/MC/MCAsmInfo.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCExpr.h"
#include "llvm/Support/ErrorHandling.h"
namespace llvm {
class X86MCExpr : public MCTargetExpr {
private:
const int64_t RegNo; // All
explicit X86MCExpr(int64_t R) : RegNo(R) {}
public:
/// @name Construction
/// @{
static const X86MCExpr *create(int64_t RegNo, MCContext &Ctx) {
return new (Ctx) X86MCExpr(RegNo);
}
/// @}
/// @name Accessors
/// @{
/// getSubExpr - Get the child of this expression.
int64_t getRegNo() const { return RegNo; }
/// @}
void printImpl(raw_ostream &OS, const MCAsmInfo *MAI) const override {
if (!MAI || MAI->getAssemblerDialect() == 0)
OS << '%';
OS << X86ATTInstPrinter::getRegisterName(RegNo);
}
bool evaluateAsRelocatableImpl(MCValue &Res, const MCAsmLayout *Layout,
const MCFixup *Fixup) const override {
return false;
}
// Register values should be inlined as they are not valid .set expressions.
bool inlineAssignedExpr() const override { return true; }
bool isEqualTo(const MCExpr *X) const override {
if (auto *E = dyn_cast<X86MCExpr>(X))
return getRegNo() == E->getRegNo();
return false;
}
void visitUsedExpr(MCStreamer &Streamer) const override{};
MCFragment *findAssociatedFragment() const override { return nullptr; }
// There are no TLS X86MCExprs at the moment.
void fixELFSymbolsInTLSFixups(MCAssembler &Asm) const override {}
static bool classof(const MCExpr *E) {
return E->getKind() == MCExpr::Target;
}
};
} // end namespace llvm
#endif