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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 "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"
#include <cctype>
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);
// FIXME: Revisit whether we actually print the get_local explicitly.
OS << "(get_local " << RegNo << ")";
}
void WebAssemblyInstPrinter::printInst(const MCInst *MI, raw_ostream &OS,
StringRef Annot,
const MCSubtargetInfo &STI) {
printInstruction(MI, OS);
const MCInstrDesc &Desc = MII.get(MI->getOpcode());
if (Desc.isVariadic())
for (unsigned i = Desc.getNumOperands(), e = MI->getNumOperands(); i < e;
++i) {
OS << ", ";
printOperand(MI, i, OS);
}
printAnnotation(OS, Annot);
unsigned NumDefs = MII.get(MI->getOpcode()).getNumDefs();
assert(NumDefs <= 1 &&
"Instructions with multiple result values not implemented");
// FIXME: Revisit whether we actually print the set_local explicitly.
if (NumDefs != 0) {
unsigned WAReg = MI->getOperand(0).getReg();
// Only print the set_local if the register is used.
// TODO: Revisit this once the spec explains what should happen here.
if (WAReg != WebAssemblyFunctionInfo::UnusedReg)
OS << "\n"
"\t" "set_local " << WAReg << ", $pop";
}
}
static std::string toString(const APFloat &FP) {
static const size_t BufBytes = 128;
char buf[BufBytes];
if (FP.isNaN())
assert((FP.bitwiseIsEqual(APFloat::getQNaN(FP.getSemantics())) ||
FP.bitwiseIsEqual(
APFloat::getQNaN(FP.getSemantics(), /*Negative=*/true))) &&
"convertToHexString handles neither SNaN nor NaN payloads");
// Use C99's hexadecimal floating-point representation.
auto Written = FP.convertToHexString(
buf, /*hexDigits=*/0, /*upperCase=*/false, APFloat::rmNearestTiesToEven);
(void)Written;
assert(Written != 0);
assert(Written < BufBytes);
return buf;
}
void WebAssemblyInstPrinter::printOperand(const MCInst *MI, unsigned OpNo,
raw_ostream &O) {
const MCOperand &Op = MI->getOperand(OpNo);
if (Op.isReg()) {
if (OpNo >= MII.get(MI->getOpcode()).getNumDefs())
printRegName(O, Op.getReg());
else {
if (Op.getReg() != WebAssemblyFunctionInfo::UnusedReg)
O << "$push";
else
O << "$discard";
}
} else if (Op.isImm())
O << Op.getImm();
else if (Op.isFPImm())
O << toString(APFloat(Op.getFPImm()));
else {
assert(Op.isExpr() && "unknown operand kind in printOperand");
Op.getExpr()->print(O, &MAI);
}
}
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