102 lines
3.4 KiB
C++
102 lines
3.4 KiB
C++
//=- WebAssemblyInstPrinter.cpp - WebAssembly assembly instruction printing -=//
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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 Print MCInst instructions to wasm format.
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///
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//===----------------------------------------------------------------------===//
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#include "InstPrinter/WebAssemblyInstPrinter.h"
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#include "WebAssembly.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/MCInstrInfo.h"
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#include "llvm/MC/MCSubtargetInfo.h"
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#include "llvm/MC/MCSymbol.h"
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#include "llvm/Support/ErrorHandling.h"
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#include "llvm/Support/FormattedStream.h"
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#include "llvm/Target/TargetRegisterInfo.h"
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#include <cctype>
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using namespace llvm;
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#define DEBUG_TYPE "asm-printer"
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#include "WebAssemblyGenAsmWriter.inc"
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WebAssemblyInstPrinter::WebAssemblyInstPrinter(const MCAsmInfo &MAI,
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const MCInstrInfo &MII,
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const MCRegisterInfo &MRI)
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: MCInstPrinter(MAI, MII, MRI) {}
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void WebAssemblyInstPrinter::printRegName(raw_ostream &OS,
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unsigned RegNo) const {
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// FIXME: Revisit whether we actually print the get_local explicitly.
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OS << "(get_local " << RegNo << ")";
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}
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void WebAssemblyInstPrinter::printInst(const MCInst *MI, raw_ostream &OS,
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StringRef Annot,
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const MCSubtargetInfo &STI) {
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printInstruction(MI, OS);
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const MCInstrDesc &Desc = MII.get(MI->getOpcode());
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if (Desc.isVariadic())
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for (unsigned i = Desc.getNumOperands(), e = MI->getNumOperands(); i < e;
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++i) {
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OS << ", ";
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printOperand(MI, i, OS);
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}
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printAnnotation(OS, Annot);
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unsigned NumDefs = MII.get(MI->getOpcode()).getNumDefs();
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assert(NumDefs <= 1 &&
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"Instructions with multiple result values not implemented");
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// FIXME: Revisit whether we actually print the set_local explicitly.
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if (NumDefs != 0)
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OS << "\n"
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"\t" "set_local " << MI->getOperand(0).getReg() << ", $pop";
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}
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static std::string toString(const APFloat &FP) {
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static const size_t BufBytes = 128;
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char buf[BufBytes];
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if (FP.isNaN())
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assert((FP.bitwiseIsEqual(APFloat::getQNaN(FP.getSemantics())) ||
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FP.bitwiseIsEqual(
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APFloat::getQNaN(FP.getSemantics(), /*Negative=*/true))) &&
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"convertToHexString handles neither SNaN nor NaN payloads");
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// Use C99's hexadecimal floating-point representation.
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auto Written = FP.convertToHexString(
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buf, /*hexDigits=*/0, /*upperCase=*/false, APFloat::rmNearestTiesToEven);
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(void)Written;
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assert(Written != 0);
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assert(Written < BufBytes);
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return buf;
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}
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void WebAssemblyInstPrinter::printOperand(const MCInst *MI, unsigned OpNo,
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raw_ostream &O) {
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const MCOperand &Op = MI->getOperand(OpNo);
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if (Op.isReg()) {
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if (OpNo < MII.get(MI->getOpcode()).getNumDefs())
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O << "$push";
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else
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printRegName(O, Op.getReg());
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} else if (Op.isImm())
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O << Op.getImm();
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else if (Op.isFPImm())
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O << toString(APFloat(Op.getFPImm()));
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else {
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assert(Op.isExpr() && "unknown operand kind in printOperand");
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Op.getExpr()->print(O, &MAI);
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}
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}
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