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//=- WebAssemblyInstPrinter.cpp - WebAssembly assembly instruction printing -=//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
///
/// \file
/// \brief Print MCInst instructions to wasm format.
///
//===----------------------------------------------------------------------===//
#include "InstPrinter/WebAssemblyInstPrinter.h"
#include "MCTargetDesc/WebAssemblyMCTargetDesc.h"
#include "WebAssembly.h"
#include "WebAssemblyMachineFunctionInfo.h"
#include "llvm/MC/MCExpr.h"
#include "llvm/MC/MCInst.h"
#include "llvm/MC/MCInstrInfo.h"
#include "llvm/MC/MCSubtargetInfo.h"
#include "llvm/MC/MCSymbol.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/FormattedStream.h"
#include "llvm/Target/TargetRegisterInfo.h"
using namespace llvm;
#define DEBUG_TYPE "asm-printer"
#include "WebAssemblyGenAsmWriter.inc"
WebAssemblyInstPrinter::WebAssemblyInstPrinter(const MCAsmInfo &MAI,
const MCInstrInfo &MII,
const MCRegisterInfo &MRI)
: MCInstPrinter(MAI, MII, MRI) {}
void WebAssemblyInstPrinter::printRegName(raw_ostream &OS,
unsigned RegNo) const {
assert(RegNo != WebAssemblyFunctionInfo::UnusedReg);
// Note that there's an implicit get_local/set_local here!
OS << "$" << RegNo;
}
void WebAssemblyInstPrinter::printInst(const MCInst *MI, raw_ostream &OS,
StringRef Annot,
const MCSubtargetInfo & /*STI*/) {
// Print the instruction (this uses the AsmStrings from the .td files).
printInstruction(MI, OS);
// Print any additional variadic operands.
const MCInstrDesc &Desc = MII.get(MI->getOpcode());
if (Desc.isVariadic())
for (auto i = Desc.getNumOperands(), e = MI->getNumOperands(); i < e; ++i) {
if (i != 0)
OS << ", ";
printOperand(MI, i, OS);
}
// Print any added annotation.
printAnnotation(OS, Annot);
}
static std::string toString(const APFloat &FP) {
static const size_t BufBytes = 128;
char buf[BufBytes];
if (FP.isNaN())
assert((FP.bitwiseIsEqual(APFloat::getQNaN(FP.getSemantics())) ||
FP.bitwiseIsEqual(
APFloat::getQNaN(FP.getSemantics(), /*Negative=*/true))) &&
"convertToHexString handles neither SNaN nor NaN payloads");
// Use C99's hexadecimal floating-point representation.
auto Written = FP.convertToHexString(
buf, /*hexDigits=*/0, /*upperCase=*/false, APFloat::rmNearestTiesToEven);
(void)Written;
assert(Written != 0);
assert(Written < BufBytes);
return buf;
}
void WebAssemblyInstPrinter::printOperand(const MCInst *MI, unsigned OpNo,
raw_ostream &O) {
const MCOperand &Op = MI->getOperand(OpNo);
if (Op.isReg()) {
unsigned WAReg = Op.getReg();
if (int(WAReg) >= 0)
printRegName(O, WAReg);
else if (OpNo >= MII.get(MI->getOpcode()).getNumDefs())
O << "$pop" << (WAReg & INT32_MAX);
else if (WAReg != WebAssemblyFunctionInfo::UnusedReg)
O << "$push" << (WAReg & INT32_MAX);
else
O << "$discard";
// 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;
}
} else if (Op.isFPImm())
O << toString(APFloat(Op.getFPImm()));
else {
assert(Op.isExpr() && "unknown operand kind in printOperand");
Op.getExpr()->print(O, &MAI);
}
}
const char *llvm::WebAssembly::TypeToString(MVT Ty) {
switch (Ty.SimpleTy) {
case MVT::i32:
return "i32";
case MVT::i64:
return "i64";
case MVT::f32:
return "f32";
case MVT::f64:
return "f64";
default:
llvm_unreachable("unsupported type");
}
}
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