#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;
+ unsigned NumArgs;
public:
WebAssemblyAsmPrinter(TargetMachine &TM, std::unique_ptr<MCStreamer> Streamer)
}
bool runOnMachineFunction(MachineFunction &MF) override {
- TII = MF.getSubtarget<WebAssemblySubtarget>().getInstrInfo();
+ const auto &Subtarget = MF.getSubtarget<WebAssemblySubtarget>();
+ TII = Subtarget.getInstrInfo();
+ NumArgs = MF.getInfo<WebAssemblyFunctionInfo>()->getNumArguments();
return AsmPrinter::runOnMachineFunction(MF);
}
// AsmPrinter Implementation.
//===------------------------------------------------------------------===//
- void EmitGlobalVariable(const GlobalVariable *GV) override;
-
+ void EmitJumpTableInfo() override;
void EmitConstantPool() override;
- void EmitFunctionEntryLabel() override;
void EmitFunctionBodyStart() override;
- void EmitFunctionBodyEnd() override;
void EmitInstruction(const MachineInstr *MI) override;
+
+ static std::string toString(const APFloat &APF);
+ const char *toString(Type *Ty) const;
+ std::string regToString(unsigned RegNo);
+ std::string argToString(unsigned ArgNo);
};
} // end anonymous namespace
static std::string toSymbol(StringRef S) { return ("$" + S).str(); }
-static const char *toString(const Type *Ty) {
- switch (Ty->getTypeID()) {
- default: 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;
- }
- }
- DEBUG(dbgs() << "Invalid type "; Ty->print(dbgs()); dbgs() << '\n');
- llvm_unreachable("invalid type");
- return "<invalid>";
-}
-
-static std::string toString(const APFloat &FP) {
+std::string WebAssemblyAsmPrinter::toString(const APFloat &FP) {
static const size_t BufBytes = 128;
char buf[BufBytes];
if (FP.isNaN())
return buf;
}
-//===----------------------------------------------------------------------===//
-// WebAssemblyAsmPrinter Implementation.
-//===----------------------------------------------------------------------===//
+std::string WebAssemblyAsmPrinter::regToString(unsigned RegNo) {
+ if (TargetRegisterInfo::isPhysicalRegister(RegNo))
+ return WebAssemblyInstPrinter::getRegisterName(RegNo);
-void WebAssemblyAsmPrinter::EmitGlobalVariable(const GlobalVariable *GV) {
- SmallString<128> Str;
- raw_svector_ostream OS(Str);
- StringRef Name = GV->getName();
- DEBUG(dbgs() << "Global " << Name << '\n');
+ // 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);
+}
- if (!GV->hasInitializer()) {
- DEBUG(dbgs() << " Skipping declaration.\n");
- return;
- }
+std::string WebAssemblyAsmPrinter::argToString(unsigned ArgNo) {
+ // Same as above, but we don't need to add NumArgs here.
+ return '@' + utostr(ArgNo);
+}
- // Check to see if this is a special global used by LLVM.
- static const char *Ignored[] = {"llvm.used", "llvm.metadata"};
- for (const char *I : Ignored)
- if (Name == I)
- return;
- // FIXME: Handle the following globals.
- static const char *Unhandled[] = {"llvm.global_ctors", "llvm.global_dtors"};
- for (const char *U : Unhandled)
- if (Name == U)
- report_fatal_error("Unhandled global");
- if (Name.startswith("llvm."))
- report_fatal_error("Unknown LLVM-internal global");
-
- if (GV->isThreadLocal())
- report_fatal_error("TLS isn't yet supported by WebAssembly");
-
- const DataLayout &DL = getDataLayout();
- const Constant *Init = GV->getInitializer();
- if (isa<UndefValue>(Init))
- Init = Constant::getNullValue(Init->getType());
- unsigned Align = DL.getPrefTypeAlignment(Init->getType());
-
- switch (GV->getLinkage()) {
- case GlobalValue::InternalLinkage:
- case GlobalValue::PrivateLinkage:
- break;
- case GlobalValue::AppendingLinkage:
- case GlobalValue::LinkOnceAnyLinkage:
- case GlobalValue::LinkOnceODRLinkage:
- case GlobalValue::WeakAnyLinkage:
- case GlobalValue::WeakODRLinkage:
- case GlobalValue::ExternalLinkage:
- case GlobalValue::CommonLinkage:
- report_fatal_error("Linkage types other than internal and private aren't "
- "supported by WebAssembly");
+const char *WebAssemblyAsmPrinter::toString(Type *Ty) const {
+ switch (Ty->getTypeID()) {
default:
- llvm_unreachable("Unknown linkage type");
- return;
- }
-
- OS << "(global " << toSymbol(Name) << ' ' << toString(Init->getType()) << ' ';
- if (const auto *C = dyn_cast<ConstantInt>(Init)) {
- assert(C->getBitWidth() <= 64 && "Printing wider types unimplemented");
- OS << C->getZExtValue();
- } else if (const auto *C = dyn_cast<ConstantFP>(Init)) {
- OS << toString(C->getValueAPF());
- } else {
- assert(false && "Only integer and floating-point constants are supported");
+ 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 8:
+ return "i8";
+ case 16:
+ return "i16";
+ case 32:
+ return "i32";
+ case 64:
+ return "i64";
+ default:
+ break;
+ }
}
- OS << ") ;; align " << Align << "\n";
- OutStreamer->EmitRawText(OS.str());
+ DEBUG(dbgs() << "Invalid type "; Ty->print(dbgs()); dbgs() << '\n');
+ llvm_unreachable("invalid type");
+ 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 " << toString(A.getType()) << ')';
- const Type *Rt = F->getReturnType();
- if (!Rt->isVoidTy())
- OS << " (result " << toString(Rt) << ')';
- OS << '\n';
- OutStreamer->EmitRawText(OS.str());
-}
+ Type *Rt = F->getReturnType();
+
+ if (!Rt->isVoidTy() || !F->arg_empty()) {
+ SmallString<128> Str;
+ raw_svector_ostream OS(Str);
+ bool First = true;
+ 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;
+ }
+ OutStreamer->EmitRawText(OS.str());
+ }
-void WebAssemblyAsmPrinter::EmitFunctionBodyEnd() {
- SmallString<128> Str;
- raw_svector_ostream OS(Str);
- OS << ") ;; end func " << toSymbol(CurrentFnSym->getName()) << '\n';
- 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 << '(' << OpcodeName(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 << regToString(MI->getOperand(1).getReg());
+ break;
+ case WebAssembly::GLOBAL:
+ // TODO: wasm64
+ OS << "i32.const " << toSymbol(MI->getOperand(1).getGlobal()->getName());
+ break;
+ case WebAssembly::ARGUMENT_I32:
+ case WebAssembly::ARGUMENT_I64:
+ case WebAssembly::ARGUMENT_F32:
+ case WebAssembly::ARGUMENT_F64:
+ OS << argToString(MI->getOperand(1).getImm());
+ break;
+ case WebAssembly::Immediate_I32:
+ OS << "i32.const " << MI->getOperand(1).getImm();
+ break;
+ case WebAssembly::Immediate_I64:
+ OS << "i64.const " << MI->getOperand(1).getImm();
+ break;
+ case WebAssembly::Immediate_F32:
+ OS << "f32.const " << toString(MI->getOperand(1).getFPImm()->getValueAPF());
+ break;
+ case WebAssembly::Immediate_F64:
+ OS << "f64.const " << toString(MI->getOperand(1).getFPImm()->getValueAPF());
+ break;
+ default: {
+ OS << OpcodeName(TII, MI);
+ bool NeedComma = false;
+ 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: {
- OS << ' ' << toString(MO.getFPImm()->getValueAPF());
- } 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 << regToString(MO.getReg());
+ 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;
+ }
}
- OS << ')';
-
- if (NumDefs != 0)
- OS << ')';
-
- OS << '\n';
+ break;
+ }
+ }
OutStreamer->EmitRawText(OS.str());
+
+ if (NumDefs != 0) {
+ SmallString<128> Str;
+ raw_svector_ostream OS(Str);
+ OS << "\t" "set_local "
+ << regToString(MI->getOperand(0).getReg()) << ", "
+ "pop";
+ OutStreamer->EmitRawText(OS.str());
+ }
}
// Force static initialization.
projects / oota-llvm.git / blobdiff