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be0ced1166
Summary:
This is much closer to the way MIPS relocation expressions work
(%hi(foo + 2) rather than %hi(foo) + 2) and removes the need for the
various bodges in MipsAsmParser::evaluateRelocExpr().
Removing those bodges ensures that the constant stored in MCValue is the
full 32 or 64-bit (depending on ABI) offset from the symbol. This will be used
to correct the %hi/%lo matching needed to sort the relocation table correctly.
As part of this:
* Gave MCExpr::print() the ability to omit parenthesis when emitting a
symbol reference inside a MipsMCExpr operator like %hi(X). Without this
we print things like %lo(($L1)).
* %hi(%neg(%gprel(X))) is now three MipsMCExpr's instead of one. Most of
the related special cases have been removed or moved to MipsMCExpr. We
can remove the rest as we gain support for the less common relocations
when they are not part of this specific combination.
* Renamed MipsMCExpr::VariantKind and the enum prefix ('VK_') to avoid confusion
with MCSymbolRefExpr::VariantKind and its prefix (also 'VK_').
* fixup_Mips_GOT_Local and fixup_Mips_GOT_Global were found to be identical
and merged into fixup_Mips_GOT.
* MO_GOT16 and MO_GOT turned out to be identical and have been merged into
MO_GOT.
* VK_Mips_GOT and VK_Mips_GOT16 turned out to be the same thing so they
have been merged into MEK_GOT
Reviewers: sdardis
Subscribers: dsanders, sdardis, llvm-commits
Differential Revision: http://reviews.llvm.org/D19716
llvm-svn: 268379
92 lines
2.3 KiB
C++
92 lines
2.3 KiB
C++
//===-- MipsMCExpr.h - Mips 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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#ifndef LLVM_LIB_TARGET_MIPS_MCTARGETDESC_MIPSMCEXPR_H
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#define LLVM_LIB_TARGET_MIPS_MCTARGETDESC_MIPSMCEXPR_H
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#include "llvm/MC/MCAsmLayout.h"
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#include "llvm/MC/MCExpr.h"
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#include "llvm/MC/MCValue.h"
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namespace llvm {
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class MipsMCExpr : public MCTargetExpr {
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public:
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enum MipsExprKind {
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MEK_None,
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MEK_CALL_HI16,
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MEK_CALL_LO16,
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MEK_DTPREL_HI,
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MEK_DTPREL_LO,
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MEK_GOT,
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MEK_GOTTPREL,
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MEK_GOT_CALL,
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MEK_GOT_DISP,
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MEK_GOT_HI16,
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MEK_GOT_LO16,
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MEK_GOT_OFST,
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MEK_GOT_PAGE,
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MEK_GPREL,
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MEK_HI,
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MEK_HIGHER,
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MEK_HIGHEST,
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MEK_LO,
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MEK_NEG,
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MEK_PCREL_HI16,
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MEK_PCREL_LO16,
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MEK_TLSGD,
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MEK_TLSLDM,
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MEK_TPREL_HI,
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MEK_TPREL_LO,
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MEK_Special,
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};
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private:
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const MipsExprKind Kind;
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const MCExpr *Expr;
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explicit MipsMCExpr(MipsExprKind Kind, const MCExpr *Expr)
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: Kind(Kind), Expr(Expr) {}
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public:
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static const MipsMCExpr *create(MipsExprKind Kind, const MCExpr *Expr,
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MCContext &Ctx);
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static const MipsMCExpr *createGpOff(MipsExprKind Kind, const MCExpr *Expr,
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MCContext &Ctx);
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/// Get the kind of this expression.
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MipsExprKind getKind() const { return Kind; }
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/// Get the child of this expression.
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const MCExpr *getSubExpr() const { return Expr; }
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void printImpl(raw_ostream &OS, const MCAsmInfo *MAI) const override;
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bool evaluateAsRelocatableImpl(MCValue &Res, const MCAsmLayout *Layout,
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const MCFixup *Fixup) const override;
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void visitUsedExpr(MCStreamer &Streamer) const override;
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MCFragment *findAssociatedFragment() const override {
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return getSubExpr()->findAssociatedFragment();
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}
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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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bool isGpOff(MipsExprKind &Kind) const;
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bool isGpOff() const {
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MipsExprKind Kind;
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return isGpOff(Kind);
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}
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};
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} // end namespace llvm
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#endif
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