diff options
Diffstat (limited to 'lib/Target/WebAssembly/InstPrinter/WebAssemblyInstPrinter.cpp')
| -rw-r--r-- | lib/Target/WebAssembly/InstPrinter/WebAssemblyInstPrinter.cpp | 131 |
1 files changed, 109 insertions, 22 deletions
diff --git a/lib/Target/WebAssembly/InstPrinter/WebAssemblyInstPrinter.cpp b/lib/Target/WebAssembly/InstPrinter/WebAssemblyInstPrinter.cpp index 7ce3a00ae360..267d716dd1d0 100644 --- a/lib/Target/WebAssembly/InstPrinter/WebAssemblyInstPrinter.cpp +++ b/lib/Target/WebAssembly/InstPrinter/WebAssemblyInstPrinter.cpp @@ -16,6 +16,8 @@ #include "MCTargetDesc/WebAssemblyMCTargetDesc.h" #include "WebAssembly.h" #include "WebAssemblyMachineFunctionInfo.h" +#include "llvm/ADT/SmallSet.h" +#include "llvm/ADT/StringExtras.h" #include "llvm/MC/MCExpr.h" #include "llvm/MC/MCInst.h" #include "llvm/MC/MCInstrInfo.h" @@ -33,7 +35,7 @@ using namespace llvm; WebAssemblyInstPrinter::WebAssemblyInstPrinter(const MCAsmInfo &MAI, const MCInstrInfo &MII, const MCRegisterInfo &MRI) - : MCInstPrinter(MAI, MII, MRI) {} + : MCInstPrinter(MAI, MII, MRI), ControlFlowCounter(0) {} void WebAssemblyInstPrinter::printRegName(raw_ostream &OS, unsigned RegNo) const { @@ -59,17 +61,71 @@ void WebAssemblyInstPrinter::printInst(const MCInst *MI, raw_ostream &OS, // Print any added annotation. printAnnotation(OS, Annot); + + if (CommentStream) { + // Observe any effects on the control flow stack, for use in annotating + // control flow label references. + switch (MI->getOpcode()) { + default: + break; + case WebAssembly::LOOP: { + // Grab the TopLabel value first so that labels print in numeric order. + uint64_t TopLabel = ControlFlowCounter++; + ControlFlowStack.push_back(std::make_pair(ControlFlowCounter++, false)); + printAnnotation(OS, "label" + utostr(TopLabel) + ':'); + ControlFlowStack.push_back(std::make_pair(TopLabel, true)); + break; + } + case WebAssembly::BLOCK: + ControlFlowStack.push_back(std::make_pair(ControlFlowCounter++, false)); + break; + case WebAssembly::END_LOOP: + ControlFlowStack.pop_back(); + printAnnotation( + OS, "label" + utostr(ControlFlowStack.pop_back_val().first) + ':'); + break; + case WebAssembly::END_BLOCK: + printAnnotation( + OS, "label" + utostr(ControlFlowStack.pop_back_val().first) + ':'); + break; + } + + // Annotate any control flow label references. + unsigned NumFixedOperands = Desc.NumOperands; + SmallSet<uint64_t, 8> Printed; + for (unsigned i = 0, e = MI->getNumOperands(); i < e; ++i) { + const MCOperandInfo &Info = Desc.OpInfo[i]; + if (!(i < NumFixedOperands + ? (Info.OperandType == WebAssembly::OPERAND_BASIC_BLOCK) + : (Desc.TSFlags & WebAssemblyII::VariableOpImmediateIsLabel))) + continue; + uint64_t Depth = MI->getOperand(i).getImm(); + if (!Printed.insert(Depth).second) + continue; + const auto &Pair = ControlFlowStack.rbegin()[Depth]; + printAnnotation(OS, utostr(Depth) + ": " + (Pair.second ? "up" : "down") + + " to label" + utostr(Pair.first)); + } + } } static std::string toString(const APFloat &FP) { + // Print NaNs with custom payloads specially. + if (FP.isNaN() && + !FP.bitwiseIsEqual(APFloat::getQNaN(FP.getSemantics())) && + !FP.bitwiseIsEqual(APFloat::getQNaN(FP.getSemantics(), /*Negative=*/true))) { + APInt AI = FP.bitcastToAPInt(); + return + std::string(AI.isNegative() ? "-" : "") + "nan:0x" + + utohexstr(AI.getZExtValue() & + (AI.getBitWidth() == 32 ? INT64_C(0x007fffff) : + INT64_C(0x000fffffffffffff)), + /*LowerCase=*/true); + } + + // Use C99's hexadecimal floating-point representation. static const size_t BufBytes = 128; char buf[BufBytes]; - if (FP.isNaN()) - assert((FP.bitwiseIsEqual(APFloat::getQNaN(FP.getSemantics())) || - FP.bitwiseIsEqual( - APFloat::getQNaN(FP.getSemantics(), /*Negative=*/true))) && - "convertToHexString handles neither SNaN nor NaN payloads"); - // Use C99's hexadecimal floating-point representation. auto Written = FP.convertToHexString( buf, /*hexDigits=*/0, /*upperCase=*/false, APFloat::rmNearestTiesToEven); (void)Written; @@ -82,37 +138,68 @@ void WebAssemblyInstPrinter::printOperand(const MCInst *MI, unsigned OpNo, raw_ostream &O) { const MCOperand &Op = MI->getOperand(OpNo); if (Op.isReg()) { + assert((OpNo < MII.get(MI->getOpcode()).getNumOperands() || + MII.get(MI->getOpcode()).TSFlags == 0) && + "WebAssembly variable_ops register ops don't use TSFlags"); unsigned WAReg = Op.getReg(); if (int(WAReg) >= 0) printRegName(O, WAReg); else if (OpNo >= MII.get(MI->getOpcode()).getNumDefs()) - O << "$pop" << (WAReg & INT32_MAX); + O << "$pop" << WebAssemblyFunctionInfo::getWARegStackId(WAReg); else if (WAReg != WebAssemblyFunctionInfo::UnusedReg) - O << "$push" << (WAReg & INT32_MAX); + O << "$push" << WebAssemblyFunctionInfo::getWARegStackId(WAReg); else - O << "$discard"; + O << "$drop"; // Add a '=' suffix if this is a def. if (OpNo < MII.get(MI->getOpcode()).getNumDefs()) O << '='; } else if (Op.isImm()) { - switch (MI->getOpcode()) { - case WebAssembly::PARAM: - case WebAssembly::RESULT: - case WebAssembly::LOCAL: - O << WebAssembly::TypeToString(MVT::SimpleValueType(Op.getImm())); - break; - default: - O << Op.getImm(); - break; + assert((OpNo < MII.get(MI->getOpcode()).getNumOperands() || + (MII.get(MI->getOpcode()).TSFlags & + WebAssemblyII::VariableOpIsImmediate)) && + "WebAssemblyII::VariableOpIsImmediate should be set for " + "variable_ops immediate ops"); + // TODO: (MII.get(MI->getOpcode()).TSFlags & + // WebAssemblyII::VariableOpImmediateIsLabel) + // can tell us whether this is an immediate referencing a label in the + // control flow stack, and it may be nice to pretty-print. + O << Op.getImm(); + } else if (Op.isFPImm()) { + const MCInstrDesc &Desc = MII.get(MI->getOpcode()); + assert(OpNo < Desc.getNumOperands() && + "Unexpected floating-point immediate as a non-fixed operand"); + assert(Desc.TSFlags == 0 && + "WebAssembly variable_ops floating point ops don't use TSFlags"); + const MCOperandInfo &Info = Desc.OpInfo[OpNo]; + if (Info.OperandType == WebAssembly::OPERAND_FP32IMM) { + // TODO: MC converts all floating point immediate operands to double. + // This is fine for numeric values, but may cause NaNs to change bits. + O << toString(APFloat(float(Op.getFPImm()))); + } else { + assert(Info.OperandType == WebAssembly::OPERAND_FP64IMM); + O << toString(APFloat(Op.getFPImm())); } - } else if (Op.isFPImm()) - O << toString(APFloat(Op.getFPImm())); - else { + } else { + assert((OpNo < MII.get(MI->getOpcode()).getNumOperands() || + (MII.get(MI->getOpcode()).TSFlags & + WebAssemblyII::VariableOpIsImmediate)) && + "WebAssemblyII::VariableOpIsImmediate should be set for " + "variable_ops expr ops"); assert(Op.isExpr() && "unknown operand kind in printOperand"); Op.getExpr()->print(O, &MAI); } } +void +WebAssemblyInstPrinter::printWebAssemblyP2AlignOperand(const MCInst *MI, + unsigned OpNo, + raw_ostream &O) { + int64_t Imm = MI->getOperand(OpNo).getImm(); + if (Imm == WebAssembly::GetDefaultP2Align(MI->getOpcode())) + return; + O << ":p2align=" << Imm; +} + const char *llvm::WebAssembly::TypeToString(MVT Ty) { switch (Ty.SimpleTy) { case MVT::i32: |