1 //=--- X86MCExpr.h - X86 specific MC expression classes ---*- C++ -*-=//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file describes X86-specific MCExprs, i.e, registers used for
11 // extended variable assignments.
13 //===----------------------------------------------------------------------===//
15 #ifndef LLVM_LIB_TARGET_X86_MCTARGETDESC_X86MCEXPR_H
16 #define LLVM_LIB_TARGET_X86_MCTARGETDESC_X86MCEXPR_H
18 #include "InstPrinter/X86ATTInstPrinter.h"
19 #include "llvm/MC/MCAsmInfo.h"
20 #include "llvm/MC/MCContext.h"
21 #include "llvm/MC/MCExpr.h"
22 #include "llvm/Support/ErrorHandling.h"
26 class X86MCExpr : public MCTargetExpr {
29 const int64_t RegNo; // All
31 explicit X86MCExpr(int64_t R) : RegNo(R) {}
34 /// @name Construction
37 static const X86MCExpr *create(int64_t RegNo, MCContext &Ctx) {
38 return new (Ctx) X86MCExpr(RegNo);
45 /// getSubExpr - Get the child of this expression.
46 int64_t getRegNo() const { return RegNo; }
50 void printImpl(raw_ostream &OS, const MCAsmInfo *MAI) const override {
51 if (!MAI || MAI->getAssemblerDialect() == 0)
53 OS << X86ATTInstPrinter::getRegisterName(RegNo);
56 bool evaluateAsRelocatableImpl(MCValue &Res, const MCAsmLayout *Layout,
57 const MCFixup *Fixup) const override {
60 // Register values should be inlined as they are not valid .set expressions.
61 bool inlineAssignedExpr() const override { return true; }
62 bool isEqualTo(const MCExpr *X) const override {
63 if (auto *E = dyn_cast<X86MCExpr>(X))
64 return getRegNo() == E->getRegNo();
67 void visitUsedExpr(MCStreamer &Streamer) const override{};
68 MCFragment *findAssociatedFragment() const override { return nullptr; }
70 // There are no TLS X86MCExprs at the moment.
71 void fixELFSymbolsInTLSFixups(MCAssembler &Asm) const override {}
73 static bool classof(const MCExpr *E) {
74 return E->getKind() == MCExpr::Target;
78 } // end namespace llvm