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// Copyright 2017 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef V8_WASM_VALUE_H_
#define V8_WASM_VALUE_H_
#include "src/boxed-float.h"
#include "src/wasm/wasm-opcodes.h"
#include "src/zone/zone-containers.h"
namespace v8 {
namespace internal {
namespace wasm {
// Macro for defining WasmValue methods for different types.
// Elements:
// - name (for to_<name>() method)
// - wasm type
// - c type
// - how to get bit pattern from value {v} of type {c type}
// - how to get value of type {c type} from bit pattern {p}
#define FOREACH_WASMVAL_TYPE(V) \
V(i32, kWasmI32, int32_t, static_cast<uint32_t>(v), static_cast<int32_t>(p)) \
V(u32, kWasmI32, uint32_t, v, static_cast<uint32_t>(p)) \
V(i64, kWasmI64, int64_t, static_cast<uint64_t>(v), static_cast<int64_t>(p)) \
V(u64, kWasmI64, uint64_t, v, p) \
V(f32, kWasmF32, float, bit_cast<uint32_t>(v), \
bit_cast<float>(static_cast<uint32_t>(p))) \
V(f32_boxed, kWasmF32, Float32, v.get_bits(), \
Float32::FromBits(static_cast<uint32_t>(p))) \
V(f64, kWasmF64, double, bit_cast<uint64_t>(v), bit_cast<double>(p)) \
V(f64_boxed, kWasmF64, Float64, v.get_bits(), Float64::FromBits(p))
// A wasm value with type information.
class WasmValue {
public:
WasmValue() : type_(kWasmStmt) {}
#define DEFINE_TYPE_SPECIFIC_METHODS(name, localtype, ctype, v_to_p, p_to_v) \
explicit WasmValue(ctype v) : type_(localtype), bit_pattern_(v_to_p) {} \
ctype to_##name() const { \
DCHECK_EQ(localtype, type_); \
return to_##name##_unchecked(); \
} \
ctype to_##name##_unchecked() const { \
auto p = bit_pattern_; \
return p_to_v; \
}
FOREACH_WASMVAL_TYPE(DEFINE_TYPE_SPECIFIC_METHODS)
#undef DEFINE_TYPE_SPECIFIC_METHODS
ValueType type() const { return type_; }
// Checks equality of type and bit pattern (also for float and double values).
bool operator==(const WasmValue& other) const {
return type_ == other.type_ && bit_pattern_ == other.bit_pattern_;
}
template <typename T>
inline T to() const;
template <typename T>
inline T to_unchecked() const;
private:
ValueType type_;
uint64_t bit_pattern_;
};
#define DECLARE_CAST(name, localtype, ctype, ...) \
template <> \
inline ctype WasmValue::to_unchecked() const { \
return to_##name##_unchecked(); \
} \
template <> \
inline ctype WasmValue::to() const { \
return to_##name(); \
}
FOREACH_WASMVAL_TYPE(DECLARE_CAST)
#undef DECLARE_CAST
} // namespace wasm
} // namespace internal
} // namespace v8
#endif // V8_WASM_VALUE_H_
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