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//===-- WebAssemblyTypeUtilities.cpp - WebAssembly Type Utility Functions -===//
//
// 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 implements several utility functions for WebAssembly type parsing.
///
//===----------------------------------------------------------------------===//
#include "WebAssemblyTypeUtilities.h"
#include "llvm/ADT/StringSwitch.h"
// Get register classes enum.
#define GET_REGINFO_ENUM
#include "WebAssemblyGenRegisterInfo.inc"
using namespace llvm;
Optional<wasm::ValType> WebAssembly::parseType(StringRef Type) {
// FIXME: can't use StringSwitch because wasm::ValType doesn't have a
// "invalid" value.
if (Type == "i32")
return wasm::ValType::I32;
if (Type == "i64")
return wasm::ValType::I64;
if (Type == "f32")
return wasm::ValType::F32;
if (Type == "f64")
return wasm::ValType::F64;
if (Type == "v128" || Type == "i8x16" || Type == "i16x8" || Type == "i32x4" ||
Type == "i64x2" || Type == "f32x4" || Type == "f64x2")
return wasm::ValType::V128;
if (Type == "funcref")
return wasm::ValType::FUNCREF;
if (Type == "externref")
return wasm::ValType::EXTERNREF;
return Optional<wasm::ValType>();
}
WebAssembly::BlockType WebAssembly::parseBlockType(StringRef Type) {
// Multivalue block types are handled separately in parseSignature
return StringSwitch<WebAssembly::BlockType>(Type)
.Case("i32", WebAssembly::BlockType::I32)
.Case("i64", WebAssembly::BlockType::I64)
.Case("f32", WebAssembly::BlockType::F32)
.Case("f64", WebAssembly::BlockType::F64)
.Case("v128", WebAssembly::BlockType::V128)
.Case("funcref", WebAssembly::BlockType::Funcref)
.Case("externref", WebAssembly::BlockType::Externref)
.Case("void", WebAssembly::BlockType::Void)
.Default(WebAssembly::BlockType::Invalid);
}
MVT WebAssembly::parseMVT(StringRef Type) {
return StringSwitch<MVT>(Type)
.Case("i32", MVT::i32)
.Case("i64", MVT::i64)
.Case("f32", MVT::f32)
.Case("f64", MVT::f64)
.Case("i64", MVT::i64)
.Case("v16i8", MVT::v16i8)
.Case("v8i16", MVT::v8i16)
.Case("v4i32", MVT::v4i32)
.Case("v2i64", MVT::v2i64)
.Case("funcref", MVT::funcref)
.Case("externref", MVT::externref)
.Default(MVT::INVALID_SIMPLE_VALUE_TYPE);
}
// We have various enums representing a subset of these types, use this
// function to convert any of them to text.
const char *WebAssembly::anyTypeToString(unsigned Type) {
switch (Type) {
case wasm::WASM_TYPE_I32:
return "i32";
case wasm::WASM_TYPE_I64:
return "i64";
case wasm::WASM_TYPE_F32:
return "f32";
case wasm::WASM_TYPE_F64:
return "f64";
case wasm::WASM_TYPE_V128:
return "v128";
case wasm::WASM_TYPE_FUNCREF:
return "funcref";
case wasm::WASM_TYPE_EXTERNREF:
return "externref";
case wasm::WASM_TYPE_FUNC:
return "func";
case wasm::WASM_TYPE_NORESULT:
return "void";
default:
return "invalid_type";
}
}
const char *WebAssembly::typeToString(wasm::ValType Type) {
return anyTypeToString(static_cast<unsigned>(Type));
}
std::string WebAssembly::typeListToString(ArrayRef<wasm::ValType> List) {
std::string S;
for (const auto &Type : List) {
if (&Type != &List[0])
S += ", ";
S += WebAssembly::typeToString(Type);
}
return S;
}
std::string WebAssembly::signatureToString(const wasm::WasmSignature *Sig) {
std::string S("(");
S += typeListToString(Sig->Params);
S += ") -> (";
S += typeListToString(Sig->Returns);
S += ")";
return S;
}
wasm::ValType WebAssembly::toValType(MVT Type) {
switch (Type.SimpleTy) {
case MVT::i32:
return wasm::ValType::I32;
case MVT::i64:
return wasm::ValType::I64;
case MVT::f32:
return wasm::ValType::F32;
case MVT::f64:
return wasm::ValType::F64;
case MVT::v16i8:
case MVT::v8i16:
case MVT::v4i32:
case MVT::v2i64:
case MVT::v4f32:
case MVT::v2f64:
return wasm::ValType::V128;
case MVT::funcref:
return wasm::ValType::FUNCREF;
case MVT::externref:
return wasm::ValType::EXTERNREF;
default:
llvm_unreachable("unexpected type");
}
}
wasm::ValType WebAssembly::regClassToValType(unsigned RC) {
switch (RC) {
case WebAssembly::I32RegClassID:
return wasm::ValType::I32;
case WebAssembly::I64RegClassID:
return wasm::ValType::I64;
case WebAssembly::F32RegClassID:
return wasm::ValType::F32;
case WebAssembly::F64RegClassID:
return wasm::ValType::F64;
case WebAssembly::V128RegClassID:
return wasm::ValType::V128;
case WebAssembly::FUNCREFRegClassID:
return wasm::ValType::FUNCREF;
case WebAssembly::EXTERNREFRegClassID:
return wasm::ValType::EXTERNREF;
default:
llvm_unreachable("unexpected type");
}
}
void WebAssembly::wasmSymbolSetType(MCSymbolWasm *Sym, const Type *GlobalVT,
const SmallVector<MVT, 1> &VTs) {
assert(!Sym->getType());
// Tables are represented as Arrays in LLVM IR therefore
// they reach this point as aggregate Array types with an element type
// that is a reference type.
wasm::ValType Type;
bool IsTable = false;
if (GlobalVT->isArrayTy() &&
WebAssembly::isRefType(GlobalVT->getArrayElementType())) {
MVT VT;
IsTable = true;
switch (GlobalVT->getArrayElementType()->getPointerAddressSpace()) {
case WebAssembly::WasmAddressSpace::WASM_ADDRESS_SPACE_FUNCREF:
VT = MVT::funcref;
break;
case WebAssembly::WasmAddressSpace::WASM_ADDRESS_SPACE_EXTERNREF:
VT = MVT::externref;
break;
default:
report_fatal_error("unhandled address space type");
}
Type = WebAssembly::toValType(VT);
} else if (VTs.size() == 1) {
Type = WebAssembly::toValType(VTs[0]);
} else
report_fatal_error("Aggregate globals not yet implemented");
if (IsTable) {
Sym->setType(wasm::WASM_SYMBOL_TYPE_TABLE);
Sym->setTableType(Type);
} else {
Sym->setType(wasm::WASM_SYMBOL_TYPE_GLOBAL);
Sym->setGlobalType(wasm::WasmGlobalType{uint8_t(Type), /*Mutable=*/true});
}
}
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