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//==- WebAssemblyAsmTypeCheck.h - Assembler for WebAssembly -*- C++ -*-==//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
///
/// \file
/// This file is part of the WebAssembly Assembler.
///
/// It contains code to translate a parsed .s file into MCInsts.
///
//===----------------------------------------------------------------------===//
#ifndef LLVM_LIB_TARGET_WEBASSEMBLY_ASMPARSER_TYPECHECK_H
#define LLVM_LIB_TARGET_WEBASSEMBLY_ASMPARSER_TYPECHECK_H
#include "llvm/BinaryFormat/Wasm.h"
#include "llvm/MC/MCInstrInfo.h"
#include "llvm/MC/MCParser/MCAsmParser.h"
#include "llvm/MC/MCParser/MCTargetAsmParser.h"
#include "llvm/MC/MCSymbol.h"
#include <variant>
namespace llvm {
class WebAssemblyAsmTypeCheck final {
MCAsmParser &Parser;
const MCInstrInfo &MII;
struct Ref : public std::monostate {};
struct Any : public std::monostate {};
struct Polymorphic : public std::monostate {};
using StackType = std::variant<wasm::ValType, Ref, Any, Polymorphic>;
SmallVector<StackType, 16> Stack;
struct BlockInfo {
wasm::WasmSignature Sig;
size_t StackStartPos;
bool IsLoop;
};
SmallVector<BlockInfo, 8> BlockInfoStack;
SmallVector<wasm::ValType, 16> LocalTypes;
wasm::WasmSignature LastSig;
bool Is64;
// checkTypes checks 'Types' against the value stack. popTypes checks 'Types'
// against the value stack and also pops them.
//
// If ExactMatch is true, 'Types' will be compared against not only the top of
// the value stack but the whole remaining value stack
// (TODO: This should be the whole remaining value stack "at the the current
// block level", which has not been implemented yet)
bool checkTypes(SMLoc ErrorLoc, ArrayRef<wasm::ValType> Types,
bool ExactMatch = false);
bool checkTypes(SMLoc ErrorLoc, ArrayRef<StackType> Types,
bool ExactMatch = false);
bool popTypes(SMLoc ErrorLoc, ArrayRef<wasm::ValType> Types,
bool ExactMatch = false);
bool popTypes(SMLoc ErrorLoc, ArrayRef<StackType> Types,
bool ExactMatch = false);
bool popType(SMLoc ErrorLoc, StackType Type);
bool popRefType(SMLoc ErrorLoc);
bool popAnyType(SMLoc ErrorLoc);
void pushTypes(ArrayRef<wasm::ValType> Types);
void pushType(StackType Type) { Stack.push_back(Type); }
bool match(StackType TypeA, StackType TypeB);
std::string getTypesString(ArrayRef<wasm::ValType> Types,
size_t StartPos = 0);
std::string getTypesString(ArrayRef<StackType> Types, size_t StartPos = 0);
SmallVector<StackType, 4>
valTypesToStackTypes(ArrayRef<wasm::ValType> ValTypes);
void dumpTypeStack(Twine Msg);
bool typeError(SMLoc ErrorLoc, const Twine &Msg);
bool getLocal(SMLoc ErrorLoc, const MCOperand &LocalOp, wasm::ValType &Type);
bool checkSig(SMLoc ErrorLoc, const wasm::WasmSignature &Sig);
bool getSymRef(SMLoc ErrorLoc, const MCOperand &SymOp,
const MCSymbolRefExpr *&SymRef);
bool getGlobal(SMLoc ErrorLoc, const MCOperand &GlobalOp,
wasm::ValType &Type);
bool getTable(SMLoc ErrorLoc, const MCOperand &TableOp, wasm::ValType &Type);
bool getSignature(SMLoc ErrorLoc, const MCOperand &SigOp,
wasm::WasmSymbolType Type, const wasm::WasmSignature *&Sig);
bool checkTryTable(SMLoc ErrorLoc, const MCInst &Inst);
public:
WebAssemblyAsmTypeCheck(MCAsmParser &Parser, const MCInstrInfo &MII,
bool Is64);
void funcDecl(const wasm::WasmSignature &Sig);
void localDecl(const SmallVectorImpl<wasm::ValType> &Locals);
void setLastSig(const wasm::WasmSignature &Sig) { LastSig = Sig; }
bool endOfFunction(SMLoc ErrorLoc, bool ExactMatch);
bool typeCheck(SMLoc ErrorLoc, const MCInst &Inst, OperandVector &Operands);
void clear() {
Stack.clear();
BlockInfoStack.clear();
LocalTypes.clear();
}
};
} // end namespace llvm
#endif // LLVM_LIB_TARGET_WEBASSEMBLY_ASMPARSER_TYPECHECK_H
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