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/*
* Copyright 2017 WebAssembly Community Group participants
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef WABT_OPCODE_H_
#define WABT_OPCODE_H_
#include "src/common.h"
namespace wabt {
class Features;
struct Opcode {
// Opcode enumerations.
//
// NOTE: this enum does not match the binary encoding.
//
enum Enum {
#define WABT_OPCODE(rtype, type1, type2, mem_size, prefix, code, Name, text) \
Name,
#include "src/opcode.def"
#undef WABT_OPCODE
Invalid,
};
// Static opcode objects.
#define WABT_OPCODE(rtype, type1, type2, mem_size, prefix, code, Name, text) \
static Opcode Name##_Opcode;
#include "src/opcode.def"
#undef WABT_OPCODE
Opcode() = default; // Provided so Opcode can be member of a union.
Opcode(Enum e) : enum_(e) {}
operator Enum() const { return enum_; }
static Opcode FromCode(uint32_t);
static Opcode FromCode(uint8_t prefix, uint32_t code);
bool HasPrefix() const { return GetInfo().prefix != 0; }
uint8_t GetPrefix() const { return GetInfo().prefix; }
uint32_t GetCode() const { return GetInfo().code; }
size_t GetLength() const { return HasPrefix() ? 2 : 1; }
const char* GetName() const { return GetInfo().name; }
Type GetResultType() const { return GetInfo().result_type; }
Type GetParamType1() const { return GetInfo().param1_type; }
Type GetParamType2() const { return GetInfo().param2_type; }
Address GetMemorySize() const { return GetInfo().memory_size; }
// Return 1 if |alignment| matches the alignment of |opcode|, or if
// |alignment| is WABT_USE_NATURAL_ALIGNMENT.
bool IsNaturallyAligned(Address alignment) const;
// If |alignment| is WABT_USE_NATURAL_ALIGNMENT, return the alignment of
// |opcode|, else return |alignment|.
Address GetAlignment(Address alignment) const;
static bool IsPrefixByte(uint8_t byte) { return byte >= kFirstPrefix; }
bool IsEnabled(const Features& features) const;
private:
static const uint32_t kFirstPrefix = 0xfc;
struct Info {
const char* name;
Type result_type;
Type param1_type;
Type param2_type;
Address memory_size;
uint8_t prefix;
uint32_t code;
uint32_t prefix_code; // See PrefixCode below. Used for fast lookup.
};
static uint32_t PrefixCode(uint8_t prefix, uint32_t code) {
// For now, 8 bits is enough for all codes.
assert(code < 0x100);
return (prefix << 8) | code;
}
Info GetInfo() const;
static Info infos_[];
static Info invalid_info_;
Enum enum_;
};
} // end anonymous namespace
#endif // WABT_OPCODE_H_
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