222 lines
8.2 KiB
C++
222 lines
8.2 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 "MCTargetDesc/WebAssemblyMCTargetDesc.h"
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#include "WebAssembly.h"
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#include "WebAssemblyMachineFunctionInfo.h"
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#include "llvm/ADT/SmallSet.h"
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#include "llvm/ADT/StringExtras.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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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), ControlFlowCounter(0) {}
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void WebAssemblyInstPrinter::printRegName(raw_ostream &OS,
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unsigned RegNo) const {
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assert(RegNo != WebAssemblyFunctionInfo::UnusedReg);
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// Note that there's an implicit get_local/set_local here!
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OS << "$" << 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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// Print the instruction (this uses the AsmStrings from the .td files).
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printInstruction(MI, OS);
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// Print any additional variadic operands.
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const MCInstrDesc &Desc = MII.get(MI->getOpcode());
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if (Desc.isVariadic())
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for (auto i = Desc.getNumOperands(), e = MI->getNumOperands(); i < e; ++i) {
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if (i != 0)
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OS << ", ";
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printOperand(MI, i, OS);
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}
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// Print any added annotation.
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printAnnotation(OS, Annot);
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if (CommentStream) {
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// Observe any effects on the control flow stack, for use in annotating
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// control flow label references.
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switch (MI->getOpcode()) {
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default:
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break;
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case WebAssembly::LOOP: {
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// Grab the TopLabel value first so that labels print in numeric order.
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uint64_t TopLabel = ControlFlowCounter++;
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ControlFlowStack.push_back(std::make_pair(ControlFlowCounter++, false));
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printAnnotation(OS, "label" + utostr(TopLabel) + ':');
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ControlFlowStack.push_back(std::make_pair(TopLabel, true));
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break;
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}
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case WebAssembly::BLOCK:
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ControlFlowStack.push_back(std::make_pair(ControlFlowCounter++, false));
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break;
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case WebAssembly::END_LOOP:
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ControlFlowStack.pop_back();
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printAnnotation(
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OS, "label" + utostr(ControlFlowStack.pop_back_val().first) + ':');
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break;
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case WebAssembly::END_BLOCK:
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printAnnotation(
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OS, "label" + utostr(ControlFlowStack.pop_back_val().first) + ':');
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break;
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}
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// Annotate any control flow label references.
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unsigned NumFixedOperands = Desc.NumOperands;
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SmallSet<uint64_t, 8> Printed;
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for (unsigned i = 0, e = MI->getNumOperands(); i < e; ++i) {
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const MCOperandInfo &Info = Desc.OpInfo[i];
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if (!(i < NumFixedOperands
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? (Info.OperandType == WebAssembly::OPERAND_BASIC_BLOCK)
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: (Desc.TSFlags & WebAssemblyII::VariableOpImmediateIsLabel)))
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continue;
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uint64_t Depth = MI->getOperand(i).getImm();
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if (!Printed.insert(Depth).second)
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continue;
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const auto &Pair = ControlFlowStack.rbegin()[Depth];
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printAnnotation(OS, utostr(Depth) + ": " + (Pair.second ? "up" : "down") +
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" to label" + utostr(Pair.first));
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}
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}
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}
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static std::string toString(const APFloat &FP) {
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// Print NaNs with custom payloads specially.
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if (FP.isNaN() &&
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!FP.bitwiseIsEqual(APFloat::getQNaN(FP.getSemantics())) &&
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!FP.bitwiseIsEqual(APFloat::getQNaN(FP.getSemantics(), /*Negative=*/true))) {
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APInt AI = FP.bitcastToAPInt();
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return
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std::string(AI.isNegative() ? "-" : "") + "nan:0x" +
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utohexstr(AI.getZExtValue() &
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(AI.getBitWidth() == 32 ? INT64_C(0x007fffff) :
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INT64_C(0x000fffffffffffff)),
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/*LowerCase=*/true);
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}
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// Use C99's hexadecimal floating-point representation.
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static const size_t BufBytes = 128;
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char buf[BufBytes];
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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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assert((OpNo < MII.get(MI->getOpcode()).getNumOperands() ||
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MII.get(MI->getOpcode()).TSFlags == 0) &&
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"WebAssembly variable_ops register ops don't use TSFlags");
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unsigned WAReg = Op.getReg();
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if (int(WAReg) >= 0)
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printRegName(O, WAReg);
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else if (OpNo >= MII.get(MI->getOpcode()).getNumDefs())
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O << "$pop" << WebAssemblyFunctionInfo::getWARegStackId(WAReg);
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else if (WAReg != WebAssemblyFunctionInfo::UnusedReg)
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O << "$push" << WebAssemblyFunctionInfo::getWARegStackId(WAReg);
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else
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O << "$drop";
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// Add a '=' suffix if this is a def.
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if (OpNo < MII.get(MI->getOpcode()).getNumDefs())
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O << '=';
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} else if (Op.isImm()) {
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assert((OpNo < MII.get(MI->getOpcode()).getNumOperands() ||
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(MII.get(MI->getOpcode()).TSFlags &
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WebAssemblyII::VariableOpIsImmediate)) &&
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"WebAssemblyII::VariableOpIsImmediate should be set for "
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"variable_ops immediate ops");
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// TODO: (MII.get(MI->getOpcode()).TSFlags &
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// WebAssemblyII::VariableOpImmediateIsLabel)
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// can tell us whether this is an immediate referencing a label in the
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// control flow stack, and it may be nice to pretty-print.
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O << Op.getImm();
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} else if (Op.isFPImm()) {
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const MCInstrDesc &Desc = MII.get(MI->getOpcode());
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assert(OpNo < Desc.getNumOperands() &&
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"Unexpected floating-point immediate as a non-fixed operand");
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assert(Desc.TSFlags == 0 &&
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"WebAssembly variable_ops floating point ops don't use TSFlags");
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const MCOperandInfo &Info = Desc.OpInfo[OpNo];
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if (Info.OperandType == WebAssembly::OPERAND_FP32IMM) {
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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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O << toString(APFloat(float(Op.getFPImm())));
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} else {
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assert(Info.OperandType == WebAssembly::OPERAND_FP64IMM);
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O << toString(APFloat(Op.getFPImm()));
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}
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} else {
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assert((OpNo < MII.get(MI->getOpcode()).getNumOperands() ||
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(MII.get(MI->getOpcode()).TSFlags &
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WebAssemblyII::VariableOpIsImmediate)) &&
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"WebAssemblyII::VariableOpIsImmediate should be set for "
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"variable_ops expr ops");
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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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void
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WebAssemblyInstPrinter::printWebAssemblyP2AlignOperand(const MCInst *MI,
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unsigned OpNo,
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raw_ostream &O) {
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int64_t Imm = MI->getOperand(OpNo).getImm();
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if (Imm == WebAssembly::GetDefaultP2Align(MI->getOpcode()))
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return;
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O << ":p2align=" << Imm;
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}
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const char *llvm::WebAssembly::TypeToString(MVT Ty) {
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switch (Ty.SimpleTy) {
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case MVT::i32:
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return "i32";
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case MVT::i64:
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return "i64";
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case MVT::f32:
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return "f32";
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case MVT::f64:
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return "f64";
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case MVT::v16i8:
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case MVT::v8i16:
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case MVT::v4i32:
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case MVT::v4f32:
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return "v128";
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default:
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llvm_unreachable("unsupported type");
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}
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}
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