#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 {
const auto &Subtarget = MF.getSubtarget<WebAssemblySubtarget>();
TII = Subtarget.getInstrInfo();
+ MRI = &MF.getRegInfo();
+ 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;
+ 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> OpcodeName(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(); }
+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];
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:
// WebAssemblyAsmPrinter Implementation.
//===----------------------------------------------------------------------===//
-void WebAssemblyAsmPrinter::EmitGlobalVariable(const GlobalVariable *GV) {
- SmallString<128> Str;
- raw_svector_ostream OS(Str);
- StringRef Name = GV->getName();
- DEBUG(dbgs() << "Global " << Name << '\n');
-
- if (!GV->hasInitializer()) {
- DEBUG(dbgs() << " Skipping declaration.\n");
- return;
- }
-
- // 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 yet");
- 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");
- }
- OS << ") ;; align " << Align;
- OutStreamer->EmitRawText(OS.str());
-}
-
void WebAssemblyAsmPrinter::EmitConstantPool() {
assert(MF->getConstantPool()->getConstants().empty() &&
"WebAssembly disables constant pools");
// Nothing to do; jump tables are incorporated into the instruction stream.
}
-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::EmitFunctionBodyStart() {
- SmallString<128> Str;
- raw_svector_ostream OS(Str);
const Function *F = MF->getFunction();
Type *Rt = F->getReturnType();
+ SmallString<128> Str;
+ raw_svector_ostream OS(Str);
+ bool First = true;
+
if (!Rt->isVoidTy() || !F->arg_empty()) {
- for (const Argument &A : F->args())
- OS << " (param " << toString(A.getType()) << ')';
- if (!Rt->isVoidTy())
- OS << " (result " << toString(Rt) << ')';
- OutStreamer->EmitRawText(OS.str());
+ 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;
+ }
}
-}
-void WebAssemblyAsmPrinter::EmitFunctionBodyEnd() {
- SmallString<128> Str;
- raw_svector_ostream OS(Str);
- OS << ") ;; end func " << toSymbol(CurrentFnSym->getName());
- OutStreamer->EmitRawText(OS.str());
+ 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) << ' ';
- }
-
- if (MI->getOpcode() == WebAssembly::COPY) {
- OS << '@' << TargetRegisterInfo::virtReg2Index(MI->getOperand(1).getReg());
- } else {
- OS << '(' << OpcodeName(TII, MI);
- for (const MachineOperand &MO : MI->uses())
+ 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;
+ if (NeedComma)
+ OS << ',';
+ NeedComma = true;
+ OS << ' ';
switch (MO.getType()) {
default:
llvm_unreachable("unexpected machine operand type");
- case MachineOperand::MO_Register: {
- if (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;
- case MachineOperand::MO_MachineBasicBlock: {
- OS << ' ' << toSymbol(MO.getMBB()->getSymbol()->getName());
- } break;
+ 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;
}
+ }
+
+ OutStreamer->EmitRawText(OS.str());
- if (NumDefs != 0)
- OS << ')';
+ 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