//===----------------------------------------------------------------------===//
#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/AsmPrinter.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;
+ const WebAssemblyFunctionInfo *MFI;
public:
WebAssemblyAsmPrinter(TargetMachine &TM, std::unique_ptr<MCStreamer> Streamer)
- : AsmPrinter(TM, std::move(Streamer)), TII(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();
+ MFI = MF.getInfo<WebAssemblyFunctionInfo>();
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;
+ void EmitEndOfAsmFile(Module &M) override;
+ 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);
};
} // 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) {
- 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]);
+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 T;
+ DEBUG(errs() << "Unknown type for register number: " << RegNo);
+ llvm_unreachable("Unknown register type");
+ return MVT::Other;
}
-static std::string toSymbol(StringRef S) { return ("$" + S).str(); }
-
-std::string WebAssemblyAsmPrinter::toString(const APFloat &FP) {
- static const size_t BufBytes = 128;
- char buf[BufBytes];
- if (FP.isNaN())
- assert((FP.bitwiseIsEqual(APFloat::getQNaN(FP.getSemantics())) ||
- FP.bitwiseIsEqual(
- APFloat::getQNaN(FP.getSemantics(), /*Negative=*/true))) &&
- "convertToHexString handles neither SNaN nor NaN payloads");
- // Use C99's hexadecimal floating-point representation.
- auto Written = FP.convertToHexString(
- buf, /*hexDigits=*/0, /*upperCase=*/false, APFloat::rmNearestTiesToEven);
- (void)Written;
- assert(Written != 0);
- assert(Written < BufBytes);
- return buf;
+std::string WebAssemblyAsmPrinter::regToString(const MachineOperand &MO) {
+ unsigned RegNo = MO.getReg();
+ assert(TargetRegisterInfo::isVirtualRegister(RegNo) &&
+ "Unlowered physical register encountered during assembly printing");
+ assert(!MFI->isVRegStackified(RegNo));
+ unsigned WAReg = MFI->getWAReg(RegNo);
+ assert(WAReg != WebAssemblyFunctionInfo::UnusedReg);
+ return '$' + utostr(WAReg);
}
-const char *WebAssemblyAsmPrinter::toString(Type *Ty) const {
- switch (Ty->getTypeID()) {
- 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 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');
- llvm_unreachable("invalid type");
- return "<invalid>";
+const char *WebAssemblyAsmPrinter::toString(MVT VT) const {
+ return WebAssembly::TypeToString(VT);
}
//===----------------------------------------------------------------------===//
// 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());
+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);
- const Function *F = MF->getFunction();
- Type *Rt = F->getReturnType();
- 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());
+ if (!MFI->getParams().empty()) {
+ MCInst Param;
+ Param.setOpcode(WebAssembly::PARAM);
+ for (MVT VT : MFI->getParams())
+ Param.addOperand(MCOperand::createImm(VT.SimpleTy));
+ EmitToStreamer(*OutStreamer, Param);
}
-}
-void WebAssemblyAsmPrinter::EmitFunctionBodyEnd() {
- SmallString<128> Str;
- raw_svector_ostream OS(Str);
- OS << ") ;; end func " << toSymbol(CurrentFnSym->getName());
- OutStreamer->EmitRawText(OS.str());
+ 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 AnyWARegs = false;
+ MCInst Local;
+ Local.setOpcode(WebAssembly::LOCAL);
+ for (unsigned Idx = 0, IdxE = MRI->getNumVirtRegs(); Idx != IdxE; ++Idx) {
+ unsigned VReg = TargetRegisterInfo::index2VirtReg(Idx);
+ 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 (AnyWARegs)
+ EmitToStreamer(*OutStreamer, Local);
+
+ AsmPrinter::EmitFunctionBodyStart();
}
void WebAssemblyAsmPrinter::EmitInstruction(const MachineInstr *MI) {
DEBUG(dbgs() << "EmitInstruction: " << *MI << '\n');
+
+ switch (MI->getOpcode()) {
+ case WebAssembly::ARGUMENT_I32:
+ case WebAssembly::ARGUMENT_I64:
+ case WebAssembly::ARGUMENT_F32:
+ case WebAssembly::ARGUMENT_F64:
+ // 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: {
+ WebAssemblyMCInstLower MCInstLowering(OutContext, *this);
+ MCInst TmpInst;
+ MCInstLowering.Lower(MI, TmpInst);
+ EmitToStreamer(*OutStreamer, TmpInst);
+ break;
+ }
+ }
+}
+
+void WebAssemblyAsmPrinter::EmitEndOfAsmFile(Module &M) {
+ const DataLayout &DL = M.getDataLayout();
+
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.isIntrinsic())
+ continue;
+ if (Str.empty())
+ OS << "\t.imports\n";
+
+ MCSymbol *Sym = OutStreamer->getContext().getOrCreateSymbol(F.getName());
+ OS << "\t.import " << *Sym << " \"\" " << *Sym;
+
+ const WebAssemblyTargetLowering &TLI =
+ *TM.getSubtarget<WebAssemblySubtarget>(F).getTargetLowering();
+
+ // If we need to legalize the return type, it'll get converted into
+ // passing a pointer.
+ bool SawParam = false;
+ SmallVector<MVT, 4> ResultVTs;
+ ComputeLegalValueVTs(F, TM, F.getReturnType(), ResultVTs);
+ if (ResultVTs.size() > 1) {
+ ResultVTs.clear();
+ OS << " (param " << toString(TLI.getPointerTy(DL));
+ SawParam = true;
+ }
- unsigned NumDefs = MI->getDesc().getNumDefs();
- assert(NumDefs <= 1 &&
- "Instructions with multiple result values not implemented");
+ for (const Argument &A : F.args()) {
+ SmallVector<MVT, 4> ParamVTs;
+ ComputeLegalValueVTs(F, TM, A.getType(), ParamVTs);
+ for (MVT VT : ParamVTs) {
+ if (!SawParam) {
+ OS << " (param";
+ SawParam = true;
+ }
+ OS << ' ' << toString(VT);
+ }
+ }
+ if (SawParam)
+ OS << ')';
- OS << '\t';
+ for (MVT VT : ResultVTs)
+ OS << " (result " << toString(VT) << ')';
- if (NumDefs != 0) {
- const MachineOperand &MO = MI->getOperand(0);
- unsigned Reg = MO.getReg();
- OS << "(setlocal @" << TargetRegisterInfo::virtReg2Index(Reg) << ' ';
- }
+ OS << '\n';
+ }
- if (MI->getOpcode() == WebAssembly::COPY) {
- OS << '@' << TargetRegisterInfo::virtReg2Index(MI->getOperand(1).getReg());
- } else {
- 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())
- 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;
- }
- OS << ')';
+ 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;
}
- if (NumDefs != 0)
- OS << ')';
+ 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;
+ }
- OutStreamer->EmitRawText(OS.str());
+ return AsmPrinter::PrintAsmMemoryOperand(MI, OpNo, AsmVariant, ExtraCode, OS);
}
// Force static initialization.
projects / oota-llvm.git / blobdiff