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d39c38d2bc
Switch to MC for instruction printing. This encompasses several changes which are all interconnected: - Use the MC framework for printing almost all instructions. - AsmStrings are now live. - This introduces an indirection between LLVM vregs and WebAssembly registers, and a new pass, WebAssemblyRegNumbering, for computing a basic the mapping. This addresses some basic issues with argument registers and unused registers. - The way ARGUMENT instructions are handled no longer generates redundant get_local+set_local for every argument. This also changes the assembly syntax somewhat; most notably, MC's printing does not use sigils on label names, so those are no longer present, and push/pop now have a sigil to keep them unambiguous. The usage of set_local/get_local/$push/$pop will continue to evolve significantly. This patch is just one step of a larger change. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@252910 91177308-0d34-0410-b5e6-96231b3b80d8
98 lines
3.3 KiB
C++
98 lines
3.3 KiB
C++
// WebAssemblyMCInstLower.cpp - Convert WebAssembly MachineInstr to an 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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/// \file
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/// \brief This file contains code to lower WebAssembly MachineInstrs to their
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/// corresponding MCInst records.
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///
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//===----------------------------------------------------------------------===//
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#include "WebAssemblyMCInstLower.h"
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#include "WebAssemblyMachineFunctionInfo.h"
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#include "llvm/ADT/SmallString.h"
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#include "llvm/CodeGen/AsmPrinter.h"
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#include "llvm/CodeGen/MachineBasicBlock.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/IR/Constants.h"
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#include "llvm/MC/MCAsmInfo.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/Support/ErrorHandling.h"
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#include "llvm/Support/raw_ostream.h"
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using namespace llvm;
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MCSymbol *
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WebAssemblyMCInstLower::GetGlobalAddressSymbol(const MachineOperand &MO) const {
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return Printer.getSymbol(MO.getGlobal());
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}
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MCOperand WebAssemblyMCInstLower::LowerSymbolOperand(const MachineOperand &MO,
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MCSymbol *Sym) const {
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const MCExpr *Expr = MCSymbolRefExpr::create(Sym, Ctx);
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if (!MO.isJTI() && MO.getOffset())
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llvm_unreachable("unknown symbol op");
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return MCOperand::createExpr(Expr);
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}
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void WebAssemblyMCInstLower::Lower(const MachineInstr *MI,
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MCInst &OutMI) const {
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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;
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switch (MO.getType()) {
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default:
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MI->dump();
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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())
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continue;
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// TODO: Handle physical registers.
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const WebAssemblyFunctionInfo &MFI =
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*MI->getParent()->getParent()->getInfo<WebAssemblyFunctionInfo>();
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unsigned WAReg = MFI.getWAReg(MO.getReg());
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MCOp = MCOperand::createReg(WAReg);
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break;
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}
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case MachineOperand::MO_Immediate:
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MCOp = MCOperand::createImm(MO.getImm());
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break;
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case MachineOperand::MO_FPImmediate: {
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// TODO: MC converts all floating point immediate operands to double.
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// This is fine for numeric values, but may cause NaNs to change bits.
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const ConstantFP *Imm = MO.getFPImm();
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if (Imm->getType()->isFloatTy())
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MCOp = MCOperand::createFPImm(Imm->getValueAPF().convertToFloat());
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else if (Imm->getType()->isDoubleTy())
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MCOp = MCOperand::createFPImm(Imm->getValueAPF().convertToDouble());
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else
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llvm_unreachable("unknown floating point immediate type");
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break;
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}
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case MachineOperand::MO_MachineBasicBlock:
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MCOp = MCOperand::createExpr(
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MCSymbolRefExpr::create(MO.getMBB()->getSymbol(), Ctx));
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break;
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case MachineOperand::MO_GlobalAddress:
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MCOp = LowerSymbolOperand(MO, GetGlobalAddressSymbol(MO));
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break;
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}
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OutMI.addOperand(MCOp);
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}
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}
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