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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
282 lines
8.3 KiB
C++
282 lines
8.3 KiB
C++
//===-- MipsMCInstLower.cpp - Convert Mips MachineInstr to MCInst ---------===//
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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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//
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// This file contains code to lower Mips MachineInstrs to their corresponding
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// MCInst records.
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//
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//===----------------------------------------------------------------------===//
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#include "MipsMCInstLower.h"
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#include "MCTargetDesc/MipsBaseInfo.h"
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#include "MipsAsmPrinter.h"
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#include "MipsInstrInfo.h"
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#include "llvm/CodeGen/MachineFunction.h"
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#include "llvm/CodeGen/MachineInstr.h"
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#include "llvm/CodeGen/MachineOperand.h"
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#include "llvm/IR/Mangler.h"
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#include "llvm/MC/MCContext.h"
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#include "llvm/MC/MCExpr.h"
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#include "llvm/MC/MCInst.h"
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#include "llvm/MC/MCStreamer.h"
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using namespace llvm;
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MipsMCInstLower::MipsMCInstLower(MipsAsmPrinter &asmprinter)
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: AsmPrinter(asmprinter) {}
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void MipsMCInstLower::Initialize(MCContext *C) {
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Ctx = C;
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}
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MCOperand MipsMCInstLower::LowerSymbolOperand(const MachineOperand &MO,
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MachineOperandType MOTy,
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unsigned Offset) const {
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MCSymbolRefExpr::VariantKind Kind = MCSymbolRefExpr::VK_None;
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MipsMCExpr::MipsExprKind TargetKind = MipsMCExpr::MEK_None;
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bool IsGpOff = false;
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const MCSymbol *Symbol;
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switch(MO.getTargetFlags()) {
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default:
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llvm_unreachable("Invalid target flag!");
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case MipsII::MO_NO_FLAG:
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break;
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case MipsII::MO_GPREL:
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TargetKind = MipsMCExpr::MEK_GPREL;
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break;
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case MipsII::MO_GOT_CALL:
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TargetKind = MipsMCExpr::MEK_GOT_CALL;
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break;
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case MipsII::MO_GOT:
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TargetKind = MipsMCExpr::MEK_GOT;
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break;
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case MipsII::MO_ABS_HI:
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TargetKind = MipsMCExpr::MEK_HI;
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break;
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case MipsII::MO_ABS_LO:
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TargetKind = MipsMCExpr::MEK_LO;
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break;
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case MipsII::MO_TLSGD:
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TargetKind = MipsMCExpr::MEK_TLSGD;
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break;
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case MipsII::MO_TLSLDM:
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TargetKind = MipsMCExpr::MEK_TLSLDM;
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break;
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case MipsII::MO_DTPREL_HI:
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TargetKind = MipsMCExpr::MEK_DTPREL_HI;
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break;
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case MipsII::MO_DTPREL_LO:
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TargetKind = MipsMCExpr::MEK_DTPREL_LO;
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break;
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case MipsII::MO_GOTTPREL:
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TargetKind = MipsMCExpr::MEK_GOTTPREL;
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break;
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case MipsII::MO_TPREL_HI:
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TargetKind = MipsMCExpr::MEK_TPREL_HI;
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break;
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case MipsII::MO_TPREL_LO:
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TargetKind = MipsMCExpr::MEK_TPREL_LO;
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break;
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case MipsII::MO_GPOFF_HI:
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TargetKind = MipsMCExpr::MEK_HI;
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IsGpOff = true;
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break;
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case MipsII::MO_GPOFF_LO:
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TargetKind = MipsMCExpr::MEK_LO;
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IsGpOff = true;
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break;
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case MipsII::MO_GOT_DISP:
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TargetKind = MipsMCExpr::MEK_GOT_DISP;
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break;
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case MipsII::MO_GOT_HI16:
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TargetKind = MipsMCExpr::MEK_GOT_HI16;
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break;
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case MipsII::MO_GOT_LO16:
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TargetKind = MipsMCExpr::MEK_GOT_LO16;
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break;
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case MipsII::MO_GOT_PAGE:
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TargetKind = MipsMCExpr::MEK_GOT_PAGE;
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break;
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case MipsII::MO_GOT_OFST:
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TargetKind = MipsMCExpr::MEK_GOT_OFST;
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break;
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case MipsII::MO_HIGHER:
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TargetKind = MipsMCExpr::MEK_HIGHER;
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break;
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case MipsII::MO_HIGHEST:
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TargetKind = MipsMCExpr::MEK_HIGHEST;
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break;
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case MipsII::MO_CALL_HI16:
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TargetKind = MipsMCExpr::MEK_CALL_HI16;
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break;
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case MipsII::MO_CALL_LO16:
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TargetKind = MipsMCExpr::MEK_CALL_LO16;
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break;
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}
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switch (MOTy) {
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case MachineOperand::MO_MachineBasicBlock:
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Symbol = MO.getMBB()->getSymbol();
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break;
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case MachineOperand::MO_GlobalAddress:
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Symbol = AsmPrinter.getSymbol(MO.getGlobal());
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Offset += MO.getOffset();
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break;
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case MachineOperand::MO_BlockAddress:
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Symbol = AsmPrinter.GetBlockAddressSymbol(MO.getBlockAddress());
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Offset += MO.getOffset();
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break;
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case MachineOperand::MO_ExternalSymbol:
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Symbol = AsmPrinter.GetExternalSymbolSymbol(MO.getSymbolName());
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Offset += MO.getOffset();
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break;
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case MachineOperand::MO_MCSymbol:
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Symbol = MO.getMCSymbol();
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Offset += MO.getOffset();
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break;
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case MachineOperand::MO_JumpTableIndex:
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Symbol = AsmPrinter.GetJTISymbol(MO.getIndex());
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break;
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case MachineOperand::MO_ConstantPoolIndex:
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Symbol = AsmPrinter.GetCPISymbol(MO.getIndex());
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Offset += MO.getOffset();
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break;
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default:
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llvm_unreachable("<unknown operand type>");
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}
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const MCExpr *Expr = MCSymbolRefExpr::create(Symbol, Kind, *Ctx);
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if (Offset) {
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// Assume offset is never negative.
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assert(Offset > 0);
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Expr = MCBinaryExpr::createAdd(Expr, MCConstantExpr::create(Offset, *Ctx),
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*Ctx);
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}
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if (IsGpOff)
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Expr = MipsMCExpr::createGpOff(TargetKind, Expr, *Ctx);
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else if (TargetKind != MipsMCExpr::MEK_None)
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Expr = MipsMCExpr::create(TargetKind, Expr, *Ctx);
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return MCOperand::createExpr(Expr);
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}
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MCOperand MipsMCInstLower::LowerOperand(const MachineOperand &MO,
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unsigned offset) const {
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MachineOperandType MOTy = MO.getType();
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switch (MOTy) {
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default: llvm_unreachable("unknown operand type");
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case MachineOperand::MO_Register:
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// Ignore all implicit register operands.
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if (MO.isImplicit()) break;
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return MCOperand::createReg(MO.getReg());
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case MachineOperand::MO_Immediate:
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return MCOperand::createImm(MO.getImm() + offset);
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case MachineOperand::MO_MachineBasicBlock:
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case MachineOperand::MO_GlobalAddress:
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case MachineOperand::MO_ExternalSymbol:
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case MachineOperand::MO_MCSymbol:
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case MachineOperand::MO_JumpTableIndex:
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case MachineOperand::MO_ConstantPoolIndex:
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case MachineOperand::MO_BlockAddress:
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return LowerSymbolOperand(MO, MOTy, offset);
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case MachineOperand::MO_RegisterMask:
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break;
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}
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return MCOperand();
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}
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MCOperand MipsMCInstLower::createSub(MachineBasicBlock *BB1,
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MachineBasicBlock *BB2,
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MipsMCExpr::MipsExprKind Kind) const {
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const MCSymbolRefExpr *Sym1 = MCSymbolRefExpr::create(BB1->getSymbol(), *Ctx);
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const MCSymbolRefExpr *Sym2 = MCSymbolRefExpr::create(BB2->getSymbol(), *Ctx);
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const MCBinaryExpr *Sub = MCBinaryExpr::createSub(Sym1, Sym2, *Ctx);
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return MCOperand::createExpr(MipsMCExpr::create(Kind, Sub, *Ctx));
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}
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void MipsMCInstLower::
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lowerLongBranchLUi(const MachineInstr *MI, MCInst &OutMI) const {
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OutMI.setOpcode(Mips::LUi);
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// Lower register operand.
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OutMI.addOperand(LowerOperand(MI->getOperand(0)));
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// Create %hi($tgt-$baltgt).
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OutMI.addOperand(createSub(MI->getOperand(1).getMBB(),
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MI->getOperand(2).getMBB(),
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MipsMCExpr::MEK_HI));
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}
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void MipsMCInstLower::lowerLongBranchADDiu(
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const MachineInstr *MI, MCInst &OutMI, int Opcode,
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MipsMCExpr::MipsExprKind Kind) const {
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OutMI.setOpcode(Opcode);
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// Lower two register operands.
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for (unsigned I = 0, E = 2; I != E; ++I) {
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const MachineOperand &MO = MI->getOperand(I);
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OutMI.addOperand(LowerOperand(MO));
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}
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// Create %lo($tgt-$baltgt) or %hi($tgt-$baltgt).
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OutMI.addOperand(createSub(MI->getOperand(2).getMBB(),
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MI->getOperand(3).getMBB(), Kind));
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}
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bool MipsMCInstLower::lowerLongBranch(const MachineInstr *MI,
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MCInst &OutMI) const {
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switch (MI->getOpcode()) {
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default:
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return false;
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case Mips::LONG_BRANCH_LUi:
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lowerLongBranchLUi(MI, OutMI);
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return true;
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case Mips::LONG_BRANCH_ADDiu:
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lowerLongBranchADDiu(MI, OutMI, Mips::ADDiu, MipsMCExpr::MEK_LO);
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return true;
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case Mips::LONG_BRANCH_DADDiu:
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unsigned TargetFlags = MI->getOperand(2).getTargetFlags();
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if (TargetFlags == MipsII::MO_ABS_HI)
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lowerLongBranchADDiu(MI, OutMI, Mips::DADDiu, MipsMCExpr::MEK_HI);
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else if (TargetFlags == MipsII::MO_ABS_LO)
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lowerLongBranchADDiu(MI, OutMI, Mips::DADDiu, MipsMCExpr::MEK_LO);
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else
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report_fatal_error("Unexpected flags for LONG_BRANCH_DADDiu");
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return true;
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}
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}
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void MipsMCInstLower::Lower(const MachineInstr *MI, MCInst &OutMI) const {
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if (lowerLongBranch(MI, OutMI))
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return;
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OutMI.setOpcode(MI->getOpcode());
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for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
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const MachineOperand &MO = MI->getOperand(i);
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MCOperand MCOp = LowerOperand(MO);
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if (MCOp.isValid())
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OutMI.addOperand(MCOp);
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}
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}
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