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d32e304f9c
This extends the work done in r233995 so that now getFragment (in addition to getSection) also works for variable symbols. With that the existing logic to decide if a-b can be computed works even if a or b are variables. Given that, the expression evaluation can avoid expanding variables as aggressively and that in turn lets the relocation code see the original variable. In order for this to work with the asm streamer, there is now a dummy fragment per section. It is used to assign a section to a symbol when no other fragment exists. This patch is a joint work by Maxim Ostapenko andy myself. llvm-svn: 249303
125 lines
3.6 KiB
C++
125 lines
3.6 KiB
C++
//===-- NVPTXMCExpr.h - NVPTX specific MC expression classes ----*- 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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// Modeled after ARMMCExpr
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#ifndef LLVM_LIB_TARGET_NVPTX_NVPTXMCEXPR_H
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#define LLVM_LIB_TARGET_NVPTX_NVPTXMCEXPR_H
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#include "llvm/ADT/APFloat.h"
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#include "llvm/MC/MCExpr.h"
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namespace llvm {
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class NVPTXFloatMCExpr : public MCTargetExpr {
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public:
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enum VariantKind {
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VK_NVPTX_None,
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VK_NVPTX_SINGLE_PREC_FLOAT, // FP constant in single-precision
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VK_NVPTX_DOUBLE_PREC_FLOAT // FP constant in double-precision
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};
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private:
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const VariantKind Kind;
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const APFloat Flt;
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explicit NVPTXFloatMCExpr(VariantKind Kind, APFloat Flt)
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: Kind(Kind), Flt(Flt) {}
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public:
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/// @name Construction
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/// @{
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static const NVPTXFloatMCExpr *create(VariantKind Kind, APFloat Flt,
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MCContext &Ctx);
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static const NVPTXFloatMCExpr *createConstantFPSingle(APFloat Flt,
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MCContext &Ctx) {
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return create(VK_NVPTX_SINGLE_PREC_FLOAT, Flt, Ctx);
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}
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static const NVPTXFloatMCExpr *createConstantFPDouble(APFloat Flt,
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MCContext &Ctx) {
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return create(VK_NVPTX_DOUBLE_PREC_FLOAT, Flt, Ctx);
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}
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/// @}
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/// @name Accessors
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/// @{
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/// getOpcode - Get the kind of this expression.
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VariantKind getKind() const { return Kind; }
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/// getSubExpr - Get the child of this expression.
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APFloat getAPFloat() const { return Flt; }
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/// @}
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void printImpl(raw_ostream &OS, const MCAsmInfo *MAI) const override;
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bool evaluateAsRelocatableImpl(MCValue &Res,
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const MCAsmLayout *Layout,
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const MCFixup *Fixup) const override {
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return false;
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}
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void visitUsedExpr(MCStreamer &Streamer) const override {};
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MCFragment *findAssociatedFragment() const override { return nullptr; }
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// There are no TLS NVPTXMCExprs at the moment.
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void fixELFSymbolsInTLSFixups(MCAssembler &Asm) const override {}
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static bool classof(const MCExpr *E) {
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return E->getKind() == MCExpr::Target;
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}
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};
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/// A wrapper for MCSymbolRefExpr that tells the assembly printer that the
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/// symbol should be enclosed by generic().
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class NVPTXGenericMCSymbolRefExpr : public MCTargetExpr {
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private:
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const MCSymbolRefExpr *SymExpr;
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explicit NVPTXGenericMCSymbolRefExpr(const MCSymbolRefExpr *_SymExpr)
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: SymExpr(_SymExpr) {}
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public:
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/// @name Construction
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/// @{
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static const NVPTXGenericMCSymbolRefExpr
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*create(const MCSymbolRefExpr *SymExpr, MCContext &Ctx);
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/// @}
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/// @name Accessors
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/// @{
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/// getOpcode - Get the kind of this expression.
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const MCSymbolRefExpr *getSymbolExpr() const { return SymExpr; }
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/// @}
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void printImpl(raw_ostream &OS, const MCAsmInfo *MAI) const override;
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bool evaluateAsRelocatableImpl(MCValue &Res,
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const MCAsmLayout *Layout,
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const MCFixup *Fixup) const override {
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return false;
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}
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void visitUsedExpr(MCStreamer &Streamer) const override {};
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MCFragment *findAssociatedFragment() const override { return nullptr; }
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// There are no TLS NVPTXMCExprs at the moment.
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void fixELFSymbolsInTLSFixups(MCAssembler &Asm) const override {}
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static bool classof(const MCExpr *E) {
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return E->getKind() == MCExpr::Target;
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}
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};
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} // end namespace llvm
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#endif
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