//===----------------------------------------------------------------------===//
#include "WebAssembly.h"
+#include "InstPrinter/WebAssemblyInstPrinter.h"
+#include "MCTargetDesc/WebAssemblyMCTargetDesc.h"
+#include "WebAssemblyMCInstLower.h"
#include "WebAssemblyMachineFunctionInfo.h"
#include "WebAssemblyRegisterInfo.h"
#include "WebAssemblySubtarget.h"
-#include "InstPrinter/WebAssemblyInstPrinter.h"
-#include "MCTargetDesc/WebAssemblyMCTargetDesc.h"
-
#include "llvm/ADT/SmallString.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/CodeGen/Analysis.h"
#include "llvm/CodeGen/MachineConstantPool.h"
#include "llvm/CodeGen/MachineInstr.h"
#include "llvm/IR/DataLayout.h"
-#include "llvm/IR/DebugInfo.h"
+#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCStreamer.h"
#include "llvm/MC/MCSymbol.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/TargetRegistry.h"
#include "llvm/Support/raw_ostream.h"
-
using namespace llvm;
#define DEBUG_TYPE "asm-printer"
namespace {
class WebAssemblyAsmPrinter final : public AsmPrinter {
- const WebAssemblyInstrInfo *TII;
const MachineRegisterInfo *MRI;
- unsigned NumArgs;
+ const WebAssemblyFunctionInfo *MFI;
public:
WebAssemblyAsmPrinter(TargetMachine &TM, std::unique_ptr<MCStreamer> Streamer)
- : AsmPrinter(TM, std::move(Streamer)), TII(nullptr), MRI(nullptr) {}
+ : AsmPrinter(TM, std::move(Streamer)), MRI(nullptr), MFI(nullptr) {}
private:
const char *getPassName() const override {
}
bool runOnMachineFunction(MachineFunction &MF) override {
- const auto &Subtarget = MF.getSubtarget<WebAssemblySubtarget>();
- TII = Subtarget.getInstrInfo();
MRI = &MF.getRegInfo();
- NumArgs = MF.getInfo<WebAssemblyFunctionInfo>()->getParams().size();
+ MFI = MF.getInfo<WebAssemblyFunctionInfo>();
return AsmPrinter::runOnMachineFunction(MF);
}
void EmitFunctionBodyStart() override;
void EmitInstruction(const MachineInstr *MI) override;
void EmitEndOfAsmFile(Module &M) override;
-
- std::string getRegTypeName(unsigned RegNo) const;
- static std::string toString(const APFloat &APF);
+ bool PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
+ unsigned AsmVariant, const char *ExtraCode,
+ raw_ostream &OS) override;
+ bool PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
+ unsigned AsmVariant, const char *ExtraCode,
+ raw_ostream &OS) override;
+
+ MVT getRegType(unsigned RegNo) const;
const char *toString(MVT VT) const;
std::string regToString(const MachineOperand &MO);
- std::string argToString(const MachineOperand &MO);
};
} // end anonymous namespace
// Helpers.
//===----------------------------------------------------------------------===//
-// Operand type (if any), followed by the lower-case version of the opcode's
-// name matching the names WebAssembly opcodes are expected to have. The
-// tablegen names are uppercase and suffixed with their type (after an
-// underscore). Conversions are additionally prefixed with their input type
-// (before a double underscore).
-static std::string OpcodeName(const WebAssemblyInstrInfo *TII,
- const MachineInstr *MI) {
- std::string N(StringRef(TII->getName(MI->getOpcode())).lower());
- std::string::size_type Len = N.length();
- std::string::size_type Under = N.rfind('_');
- bool HasType = std::string::npos != Under;
- std::string::size_type NameEnd = HasType ? Under : Len;
- std::string Name(&N[0], &N[NameEnd]);
- if (!HasType)
- return Name;
- for (const char *typelessOpcode : { "return", "call", "br_if" })
- if (Name == typelessOpcode)
- return Name;
- std::string Type(&N[NameEnd + 1], &N[Len]);
- std::string::size_type DoubleUnder = Name.find("__");
- bool IsConv = std::string::npos != DoubleUnder;
- if (!IsConv)
- return Type + '.' + Name;
- std::string InType(&Name[0], &Name[DoubleUnder]);
- return Type + '.' + std::string(&Name[DoubleUnder + 2], &Name[NameEnd]) +
- '/' + InType;
-}
-
-static std::string toSymbol(StringRef S) { return ("$" + S).str(); }
-
-std::string WebAssemblyAsmPrinter::getRegTypeName(unsigned RegNo) const {
+MVT WebAssemblyAsmPrinter::getRegType(unsigned RegNo) const {
const TargetRegisterClass *TRC = MRI->getRegClass(RegNo);
for (MVT T : {MVT::i32, MVT::i64, MVT::f32, MVT::f64})
if (TRC->hasType(T))
- return EVT(T).getEVTString();
+ return T;
DEBUG(errs() << "Unknown type for register number: " << RegNo);
llvm_unreachable("Unknown register type");
- return "?";
-}
-
-std::string WebAssemblyAsmPrinter::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;
+ return MVT::Other;
}
std::string WebAssemblyAsmPrinter::regToString(const MachineOperand &MO) {
unsigned RegNo = MO.getReg();
- if (TargetRegisterInfo::isPhysicalRegister(RegNo))
- return WebAssemblyInstPrinter::getRegisterName(RegNo);
-
- // WebAssembly arguments and local variables are in the same index space, and
- // there are no explicit varargs, so we just add the number of arguments to
- // the virtual register number to get the local variable number.
- return utostr(TargetRegisterInfo::virtReg2Index(RegNo) + NumArgs);
-}
-
-std::string WebAssemblyAsmPrinter::argToString(const MachineOperand &MO) {
- unsigned ArgNo = MO.getImm();
- // Same as above, but we don't need to add NumArgs here.
- return utostr(ArgNo);
+ assert(TargetRegisterInfo::isVirtualRegister(RegNo) &&
+ "Unlowered physical register encountered during assembly printing");
+ assert(!MFI->isVRegStackified(RegNo));
+ unsigned WAReg = MFI->getWAReg(RegNo);
+ assert(WAReg != WebAssemblyFunctionInfo::UnusedReg);
+ return '$' + utostr(WAReg);
}
const char *WebAssemblyAsmPrinter::toString(MVT VT) const {
- switch (VT.SimpleTy) {
- default:
- break;
- case MVT::f32:
- return "f32";
- case MVT::f64:
- return "f64";
- case MVT::i32:
- return "i32";
- case MVT::i64:
- return "i64";
- }
- DEBUG(dbgs() << "Invalid type " << EVT(VT).getEVTString() << '\n');
- llvm_unreachable("invalid type");
- return "<invalid>";
+ return WebAssembly::TypeToString(VT);
}
//===----------------------------------------------------------------------===//
// Nothing to do; jump tables are incorporated into the instruction stream.
}
+static void ComputeLegalValueVTs(const Function &F, const TargetMachine &TM,
+ Type *Ty, SmallVectorImpl<MVT> &ValueVTs) {
+ const DataLayout &DL(F.getParent()->getDataLayout());
+ const WebAssemblyTargetLowering &TLI =
+ *TM.getSubtarget<WebAssemblySubtarget>(F).getTargetLowering();
+ SmallVector<EVT, 4> VTs;
+ ComputeValueVTs(TLI, DL, Ty, VTs);
+
+ for (EVT VT : VTs) {
+ unsigned NumRegs = TLI.getNumRegisters(F.getContext(), VT);
+ MVT RegisterVT = TLI.getRegisterType(F.getContext(), VT);
+ for (unsigned i = 0; i != NumRegs; ++i)
+ ValueVTs.push_back(RegisterVT);
+ }
+}
+
void WebAssemblyAsmPrinter::EmitFunctionBodyStart() {
- SmallString<128> Str;
- raw_svector_ostream OS(Str);
+ if (!MFI->getParams().empty()) {
+ MCInst Param;
+ Param.setOpcode(WebAssembly::PARAM);
+ for (MVT VT : MFI->getParams())
+ Param.addOperand(MCOperand::createImm(VT.SimpleTy));
+ EmitToStreamer(*OutStreamer, Param);
+ }
- for (MVT VT : MF->getInfo<WebAssemblyFunctionInfo>()->getParams())
- OS << "\t" ".param "
- << toString(VT) << '\n';
- for (MVT VT : MF->getInfo<WebAssemblyFunctionInfo>()->getResults())
- OS << "\t" ".result "
- << toString(VT) << '\n';
+ SmallVector<MVT, 4> ResultVTs;
+ const Function &F(*MF->getFunction());
+ ComputeLegalValueVTs(F, TM, F.getReturnType(), ResultVTs);
+ // If the return type needs to be legalized it will get converted into
+ // passing a pointer.
+ if (ResultVTs.size() == 1) {
+ MCInst Result;
+ Result.setOpcode(WebAssembly::RESULT);
+ Result.addOperand(MCOperand::createImm(ResultVTs.front().SimpleTy));
+ EmitToStreamer(*OutStreamer, Result);
+ }
- bool FirstVReg = true;
+ bool AnyWARegs = false;
+ MCInst Local;
+ Local.setOpcode(WebAssembly::LOCAL);
for (unsigned Idx = 0, IdxE = MRI->getNumVirtRegs(); Idx != IdxE; ++Idx) {
unsigned VReg = TargetRegisterInfo::index2VirtReg(Idx);
- // FIXME: Don't skip dead virtual registers for now: that would require
- // remapping all locals' numbers.
- // if (!MRI->use_empty(VReg)) {
- if (FirstVReg)
- OS << "\t" ".local ";
- else
- OS << ", ";
- OS << getRegTypeName(VReg);
- FirstVReg = false;
- //}
+ unsigned WAReg = MFI->getWAReg(VReg);
+ // Don't declare unused registers.
+ if (WAReg == WebAssemblyFunctionInfo::UnusedReg)
+ continue;
+ // Don't redeclare parameters.
+ if (WAReg < MFI->getParams().size())
+ continue;
+ // Don't declare stackified registers.
+ if (int(WAReg) < 0)
+ continue;
+ Local.addOperand(MCOperand::createImm(getRegType(VReg).SimpleTy));
+ AnyWARegs = true;
}
- if (!FirstVReg)
- OS << '\n';
+ if (AnyWARegs)
+ EmitToStreamer(*OutStreamer, Local);
- // EmitRawText appends a newline, so strip off the last newline.
- StringRef Text = OS.str();
- if (!Text.empty())
- OutStreamer->EmitRawText(Text.substr(0, Text.size() - 1));
AsmPrinter::EmitFunctionBodyStart();
}
void WebAssemblyAsmPrinter::EmitInstruction(const MachineInstr *MI) {
DEBUG(dbgs() << "EmitInstruction: " << *MI << '\n');
- SmallString<128> Str;
- raw_svector_ostream OS(Str);
-
- unsigned NumDefs = MI->getDesc().getNumDefs();
- assert(NumDefs <= 1 &&
- "Instructions with multiple result values not implemented");
-
- OS << '\t';
switch (MI->getOpcode()) {
- case TargetOpcode::COPY:
- OS << "get_local push, " << regToString(MI->getOperand(1));
- break;
case WebAssembly::ARGUMENT_I32:
case WebAssembly::ARGUMENT_I64:
case WebAssembly::ARGUMENT_F32:
case WebAssembly::ARGUMENT_F64:
- OS << "get_local push, " << argToString(MI->getOperand(1));
+ // These represent values which are live into the function entry, so there's
+ // no instruction to emit.
+ break;
+ case WebAssembly::LOOP_END:
+ // This is a no-op which just exists to tell AsmPrinter.cpp that there's a
+ // fallthrough which nevertheless requires a label for the destination here.
break;
default: {
- OS << OpcodeName(TII, MI);
- bool NeedComma = false;
- bool DefsPushed = false;
- if (NumDefs != 0 && !MI->isCall()) {
- OS << " push";
- NeedComma = true;
- DefsPushed = true;
- }
- for (const MachineOperand &MO : MI->uses()) {
- if (MO.isReg() && MO.isImplicit())
- continue;
- if (NeedComma)
- OS << ',';
- NeedComma = true;
- OS << ' ';
- switch (MO.getType()) {
- default:
- llvm_unreachable("unexpected machine operand type");
- case MachineOperand::MO_Register:
- OS << "(get_local " << regToString(MO) << ')';
- break;
- case MachineOperand::MO_Immediate:
- OS << MO.getImm();
- break;
- case MachineOperand::MO_FPImmediate:
- OS << toString(MO.getFPImm()->getValueAPF());
- break;
- case MachineOperand::MO_GlobalAddress:
- OS << toSymbol(MO.getGlobal()->getName());
- break;
- case MachineOperand::MO_MachineBasicBlock:
- OS << toSymbol(MO.getMBB()->getSymbol()->getName());
- break;
- }
- if (NumDefs != 0 && !DefsPushed) {
- // Special-case for calls; print the push after the callee.
- assert(MI->isCall());
- OS << ", push";
- DefsPushed = true;
- }
- }
+ WebAssemblyMCInstLower MCInstLowering(OutContext, *this);
+ MCInst TmpInst;
+ MCInstLowering.Lower(MI, TmpInst);
+ EmitToStreamer(*OutStreamer, TmpInst);
break;
}
}
-
- OutStreamer->EmitRawText(OS.str());
-
- if (NumDefs != 0) {
- SmallString<128> Str;
- raw_svector_ostream OS(Str);
- const MachineOperand &Operand = MI->getOperand(0);
- OS << "\tset_local " << regToString(Operand) << ", pop";
- OutStreamer->EmitRawText(OS.str());
- }
-}
-
-static void ComputeLegalValueVTs(LLVMContext &Context,
- const WebAssemblyTargetLowering &TLI,
- const DataLayout &DL, Type *Ty,
- SmallVectorImpl<MVT> &ValueVTs) {
- SmallVector<EVT, 4> VTs;
- ComputeValueVTs(TLI, DL, Ty, VTs);
-
- for (EVT VT : VTs) {
- unsigned NumRegs = TLI.getNumRegisters(Context, VT);
- MVT RegisterVT = TLI.getRegisterType(Context, VT);
- for (unsigned i = 0; i != NumRegs; ++i)
- ValueVTs.push_back(RegisterVT);
- }
}
void WebAssemblyAsmPrinter::EmitEndOfAsmFile(Module &M) {
if (Str.empty())
OS << "\t.imports\n";
- OS << "\t.import " << toSymbol(F.getName()) << " \"\" \"" << F.getName()
- << "\"";
+ MCSymbol *Sym = OutStreamer->getContext().getOrCreateSymbol(F.getName());
+ OS << "\t.import " << *Sym << " \"\" " << *Sym;
const WebAssemblyTargetLowering &TLI =
*TM.getSubtarget<WebAssemblySubtarget>(F).getTargetLowering();
// passing a pointer.
bool SawParam = false;
SmallVector<MVT, 4> ResultVTs;
- ComputeLegalValueVTs(M.getContext(), TLI, DL, F.getReturnType(),
- ResultVTs);
+ ComputeLegalValueVTs(F, TM, F.getReturnType(), ResultVTs);
if (ResultVTs.size() > 1) {
ResultVTs.clear();
OS << " (param " << toString(TLI.getPointerTy(DL));
for (const Argument &A : F.args()) {
SmallVector<MVT, 4> ParamVTs;
- ComputeLegalValueVTs(M.getContext(), TLI, DL, A.getType(), ParamVTs);
- for (EVT VT : ParamVTs) {
+ ComputeLegalValueVTs(F, TM, A.getType(), ParamVTs);
+ for (MVT VT : ParamVTs) {
if (!SawParam) {
OS << " (param";
SawParam = true;
}
- OS << ' ' << toString(VT.getSimpleVT());
+ OS << ' ' << toString(VT);
}
}
if (SawParam)
OS << ')';
- for (EVT VT : ResultVTs)
- OS << " (result " << toString(VT.getSimpleVT()) << ')';
+ for (MVT VT : ResultVTs)
+ OS << " (result " << toString(VT) << ')';
OS << '\n';
}
StringRef Text = OS.str();
if (!Text.empty())
OutStreamer->EmitRawText(Text.substr(0, Text.size() - 1));
+
+ AsmPrinter::EmitEndOfAsmFile(M);
+}
+
+bool WebAssemblyAsmPrinter::PrintAsmOperand(const MachineInstr *MI,
+ unsigned OpNo, unsigned AsmVariant,
+ const char *ExtraCode,
+ raw_ostream &OS) {
+ if (AsmVariant != 0)
+ report_fatal_error("There are no defined alternate asm variants");
+
+ if (!ExtraCode) {
+ const MachineOperand &MO = MI->getOperand(OpNo);
+ if (MO.isImm())
+ OS << MO.getImm();
+ else
+ OS << regToString(MO);
+ return false;
+ }
+
+ return AsmPrinter::PrintAsmOperand(MI, OpNo, AsmVariant, ExtraCode, OS);
+}
+
+bool WebAssemblyAsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI,
+ unsigned OpNo,
+ unsigned AsmVariant,
+ const char *ExtraCode,
+ raw_ostream &OS) {
+ if (AsmVariant != 0)
+ report_fatal_error("There are no defined alternate asm variants");
+
+ if (!ExtraCode) {
+ OS << regToString(MI->getOperand(OpNo));
+ return false;
+ }
+
+ return AsmPrinter::PrintAsmMemoryOperand(MI, OpNo, AsmVariant, ExtraCode, OS);
}
// Force static initialization.
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