1 // WebAssemblyMCInstLower.cpp - Convert WebAssembly MachineInstr to an MCInst //
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
11 /// \brief This file contains code to lower WebAssembly MachineInstrs to their
12 /// corresponding MCInst records.
14 //===----------------------------------------------------------------------===//
16 #include "WebAssemblyMCInstLower.h"
17 #include "WebAssemblyMachineFunctionInfo.h"
18 #include "llvm/ADT/SmallString.h"
19 #include "llvm/CodeGen/AsmPrinter.h"
20 #include "llvm/CodeGen/MachineFunction.h"
21 #include "llvm/IR/Constants.h"
22 #include "llvm/MC/MCAsmInfo.h"
23 #include "llvm/MC/MCContext.h"
24 #include "llvm/MC/MCExpr.h"
25 #include "llvm/MC/MCInst.h"
26 #include "llvm/Support/ErrorHandling.h"
27 #include "llvm/Support/raw_ostream.h"
31 WebAssemblyMCInstLower::GetGlobalAddressSymbol(const MachineOperand &MO) const {
32 return Printer.getSymbol(MO.getGlobal());
35 MCSymbol *WebAssemblyMCInstLower::GetExternalSymbolSymbol(
36 const MachineOperand &MO) const {
37 return Printer.GetExternalSymbolSymbol(MO.getSymbolName());
40 MCOperand WebAssemblyMCInstLower::LowerSymbolOperand(const MachineOperand &MO,
41 MCSymbol *Sym) const {
43 const MCExpr *Expr = MCSymbolRefExpr::create(Sym, Ctx);
45 if (!MO.isJTI() && MO.getOffset())
46 llvm_unreachable("unknown symbol op");
48 return MCOperand::createExpr(Expr);
51 void WebAssemblyMCInstLower::Lower(const MachineInstr *MI,
52 MCInst &OutMI) const {
53 OutMI.setOpcode(MI->getOpcode());
55 for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
56 const MachineOperand &MO = MI->getOperand(i);
59 switch (MO.getType()) {
62 llvm_unreachable("unknown operand type");
63 case MachineOperand::MO_Register: {
64 // Ignore all implicit register operands.
67 const WebAssemblyFunctionInfo &MFI =
68 *MI->getParent()->getParent()->getInfo<WebAssemblyFunctionInfo>();
69 unsigned WAReg = MFI.getWAReg(MO.getReg());
70 MCOp = MCOperand::createReg(WAReg);
73 case MachineOperand::MO_Immediate:
74 MCOp = MCOperand::createImm(MO.getImm());
76 case MachineOperand::MO_FPImmediate: {
77 // TODO: MC converts all floating point immediate operands to double.
78 // This is fine for numeric values, but may cause NaNs to change bits.
79 const ConstantFP *Imm = MO.getFPImm();
80 if (Imm->getType()->isFloatTy())
81 MCOp = MCOperand::createFPImm(Imm->getValueAPF().convertToFloat());
82 else if (Imm->getType()->isDoubleTy())
83 MCOp = MCOperand::createFPImm(Imm->getValueAPF().convertToDouble());
85 llvm_unreachable("unknown floating point immediate type");
88 case MachineOperand::MO_MachineBasicBlock:
89 MCOp = MCOperand::createExpr(
90 MCSymbolRefExpr::create(MO.getMBB()->getSymbol(), Ctx));
92 case MachineOperand::MO_GlobalAddress:
93 MCOp = LowerSymbolOperand(MO, GetGlobalAddressSymbol(MO));
95 case MachineOperand::MO_ExternalSymbol:
96 MCOp = LowerSymbolOperand(MO, GetExternalSymbolSymbol(MO));
100 OutMI.addOperand(MCOp);