#include "MCTargetDesc/WebAssemblyMCTargetDesc.h"
#include "llvm/ADT/SmallString.h"
+#include "llvm/ADT/StringExtras.h"
#include "llvm/CodeGen/AsmPrinter.h"
#include "llvm/CodeGen/MachineConstantPool.h"
#include "llvm/CodeGen/MachineInstr.h"
class WebAssemblyAsmPrinter final : public AsmPrinter {
const WebAssemblyInstrInfo *TII;
+ const MachineRegisterInfo *MRI;
+ unsigned NumArgs;
public:
WebAssemblyAsmPrinter(TargetMachine &TM, std::unique_ptr<MCStreamer> Streamer)
- : AsmPrinter(TM, std::move(Streamer)), TII(nullptr) {}
+ : AsmPrinter(TM, std::move(Streamer)), TII(nullptr), MRI(nullptr) {}
private:
const char *getPassName() const override {
}
bool runOnMachineFunction(MachineFunction &MF) override {
- TII = MF.getSubtarget<WebAssemblySubtarget>().getInstrInfo();
+ const auto &Subtarget = MF.getSubtarget<WebAssemblySubtarget>();
+ TII = Subtarget.getInstrInfo();
+ MRI = &MF.getRegInfo();
+ NumArgs = MF.getInfo<WebAssemblyFunctionInfo>()->getNumArguments();
return AsmPrinter::runOnMachineFunction(MF);
}
// AsmPrinter Implementation.
//===------------------------------------------------------------------===//
+ void EmitJumpTableInfo() override;
void EmitConstantPool() override;
- void EmitFunctionEntryLabel() override;
void EmitFunctionBodyStart() override;
- void EmitFunctionBodyEnd() 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);
+ const char *toString(Type *Ty) const;
+ std::string regToString(const MachineOperand &MO);
+ std::string argToString(const MachineOperand &MO);
};
} // end anonymous namespace
+//===----------------------------------------------------------------------===//
+// Helpers.
//===----------------------------------------------------------------------===//
-// Untyped, 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).
-static SmallString<32> Name(const WebAssemblyInstrInfo *TII,
- const MachineInstr *MI) {
+// 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 End = N.rfind('_');
- End = std::string::npos == End ? N.length() : End;
- return SmallString<32>(&N[0], &N[End]);
+ 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(); }
-static const char *toType(const Type *Ty) {
+std::string WebAssemblyAsmPrinter::getRegTypeName(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();
+ 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;
+}
+
+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);
+}
+
+const char *WebAssemblyAsmPrinter::toString(Type *Ty) const {
switch (Ty->getTypeID()) {
- default: break;
- case Type::FloatTyID: return "f32";
- case Type::DoubleTyID: return "f64";
+ default:
+ break;
+ // Treat all pointers as the underlying integer into linear memory.
+ case Type::PointerTyID:
+ switch (getPointerSize()) {
+ case 4:
+ return "i32";
+ case 8:
+ return "i64";
+ default:
+ llvm_unreachable("unsupported pointer size");
+ }
+ break;
+ case Type::FloatTyID:
+ return "f32";
+ case Type::DoubleTyID:
+ return "f64";
case Type::IntegerTyID:
switch (Ty->getIntegerBitWidth()) {
- case 32: return "i32";
- case 64: return "i64";
- default: break;
+ case 8:
+ return "i8";
+ case 16:
+ return "i16";
+ case 32:
+ return "i32";
+ case 64:
+ return "i64";
+ default:
+ break;
}
}
DEBUG(dbgs() << "Invalid type "; Ty->print(dbgs()); dbgs() << '\n');
return "<invalid>";
}
+//===----------------------------------------------------------------------===//
+// WebAssemblyAsmPrinter Implementation.
+//===----------------------------------------------------------------------===//
+
void WebAssemblyAsmPrinter::EmitConstantPool() {
assert(MF->getConstantPool()->getConstants().empty() &&
"WebAssembly disables constant pools");
}
-void WebAssemblyAsmPrinter::EmitFunctionEntryLabel() {
- SmallString<128> Str;
- raw_svector_ostream OS(Str);
-
- CurrentFnSym->redefineIfPossible();
-
- // The function label could have already been emitted if two symbols end up
- // conflicting due to asm renaming. Detect this and emit an error.
- if (CurrentFnSym->isVariable())
- report_fatal_error("'" + Twine(CurrentFnSym->getName()) +
- "' is a protected alias");
- if (CurrentFnSym->isDefined())
- report_fatal_error("'" + Twine(CurrentFnSym->getName()) +
- "' label emitted multiple times to assembly file");
-
- OS << "(func " << toSymbol(CurrentFnSym->getName());
- OutStreamer->EmitRawText(OS.str());
+void WebAssemblyAsmPrinter::EmitJumpTableInfo() {
+ // Nothing to do; jump tables are incorporated into the instruction stream.
}
void WebAssemblyAsmPrinter::EmitFunctionBodyStart() {
- SmallString<128> Str;
- raw_svector_ostream OS(Str);
const Function *F = MF->getFunction();
- for (const Argument &A : F->args())
- OS << " (param " << toType(A.getType()) << ')';
- const Type *Rt = F->getReturnType();
- if (!Rt->isVoidTy())
- OS << " (result " << toType(Rt) << ')';
- OS << '\n';
- OutStreamer->EmitRawText(OS.str());
-}
-
-void WebAssemblyAsmPrinter::EmitFunctionBodyEnd() {
+ Type *Rt = F->getReturnType();
SmallString<128> Str;
raw_svector_ostream OS(Str);
- OS << ") ;; end func " << toSymbol(CurrentFnSym->getName()) << '\n';
- OutStreamer->EmitRawText(OS.str());
+ bool First = true;
+
+ if (!Rt->isVoidTy() || !F->arg_empty()) {
+ for (const Argument &A : F->args()) {
+ OS << (First ? "" : "\n") << "\t.param " << toString(A.getType());
+ First = false;
+ }
+ if (!Rt->isVoidTy()) {
+ OS << (First ? "" : "\n") << "\t.result " << toString(Rt);
+ First = false;
+ }
+ }
+
+ bool FirstVReg = true;
+ 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 << (First ? "" : "\n") << "\t.local ";
+ First = false;
+ }
+ OS << (FirstVReg ? "" : ", ") << getRegTypeName(VReg);
+ FirstVReg = false;
+ //}
+ }
+
+ if (!First)
+ OutStreamer->EmitRawText(OS.str());
+ AsmPrinter::EmitFunctionBodyStart();
}
void WebAssemblyAsmPrinter::EmitInstruction(const MachineInstr *MI) {
OS << '\t';
- if (NumDefs != 0) {
- const MachineOperand &MO = MI->getOperand(0);
- unsigned Reg = MO.getReg();
- OS << "(setlocal @" << TargetRegisterInfo::virtReg2Index(Reg) << ' ';
- }
-
- OS << '(' << Name(TII, MI);
- for (const MachineOperand &MO : MI->uses())
- switch (MO.getType()) {
- default:
- llvm_unreachable("unexpected machine operand type");
- case MachineOperand::MO_Register: {
- if (MO.isImplicit())
+ 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));
+ 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;
- unsigned Reg = MO.getReg();
- OS << " @" << TargetRegisterInfo::virtReg2Index(Reg);
- } break;
- case MachineOperand::MO_Immediate: {
- OS << ' ' << MO.getImm();
- } break;
- case MachineOperand::MO_FPImmediate: {
- static const size_t BufBytes = 128;
- char buf[BufBytes];
- APFloat FP = MO.getFPImm()->getValueAPF();
- 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);
- OS << ' ' << buf;
- } break;
- case MachineOperand::MO_GlobalAddress: {
- OS << ' ' << toSymbol(MO.getGlobal()->getName());
- } break;
+ 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;
+ }
}
- OS << ')';
+ break;
+ }
+ }
- if (NumDefs != 0)
- OS << ')';
+ OutStreamer->EmitRawText(OS.str());
- OS << '\n';
+ 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());
+ }
+}
+void WebAssemblyAsmPrinter::EmitEndOfAsmFile(Module &M) {
+ SmallString<128> Str;
+ raw_svector_ostream OS(Str);
+ for (const Function &F : M)
+ if (F.isDeclarationForLinker()) {
+ assert(F.hasName() && "imported functions must have a name");
+ if (F.getName().startswith("llvm."))
+ continue;
+ if (Str.empty())
+ OS << "\t.imports\n";
+ Type *Rt = F.getReturnType();
+ OS << "\t.import " << toSymbol(F.getName()) << " \"\" \"" << F.getName()
+ << "\" (param";
+ for (const Argument &A : F.args())
+ OS << ' ' << toString(A.getType());
+ OS << ')';
+ if (!Rt->isVoidTy())
+ OS << " (result " << toString(Rt) << ')';
+ OS << '\n';
+ }
OutStreamer->EmitRawText(OS.str());
}
projects / oota-llvm.git / blobdiff