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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_WASM_VALUE_H_
#define V8_WASM_WASM_VALUE_H_
#include "src/base/memory.h"
#include "src/handles/handles.h"
#include "src/utils/boxed-float.h"
#include "src/wasm/wasm-opcodes.h"
#include "src/zone/zone-containers.h"
namespace v8 {
namespace internal {
namespace wasm {
#define FOREACH_SIMD_TYPE(V) \
V(double, float2, f64x2, 2) \
V(float, float4, f32x4, 4) \
V(int64_t, int2, i64x2, 2) \
V(int32_t, int4, i32x4, 4) \
V(int16_t, int8, i16x8, 8) \
V(int8_t, int16, i8x16, 16)
#define DEFINE_SIMD_TYPE(cType, sType, name, kSize) \
struct sType { \
cType val[kSize]; \
};
FOREACH_SIMD_TYPE(DEFINE_SIMD_TYPE)
#undef DEFINE_SIMD_TYPE
class Simd128 {
public:
Simd128() : val_() {
for (size_t i = 0; i < 16; i++) {
val_[i] = 0;
}
}
#define DEFINE_SIMD_TYPE_SPECIFIC_METHODS(cType, sType, name, size) \
explicit Simd128(sType val) { \
base::WriteUnalignedValue<sType>(reinterpret_cast<Address>(val_), val); \
} \
sType to_##name() { \
return base::ReadUnalignedValue<sType>(reinterpret_cast<Address>(val_)); \
}
FOREACH_SIMD_TYPE(DEFINE_SIMD_TYPE_SPECIFIC_METHODS)
#undef DEFINE_SIMD_TYPE_SPECIFIC_METHODS
private:
uint8_t val_[16];
};
// Macro for defining WasmValue methods for different types.
// Elements:
// - name (for to_<name>() method)
// - wasm type
// - c type
#define FOREACH_WASMVAL_TYPE(V) \
V(i32, kWasmI32, int32_t) \
V(u32, kWasmI32, uint32_t) \
V(i64, kWasmI64, int64_t) \
V(u64, kWasmI64, uint64_t) \
V(f32, kWasmF32, float) \
V(f32_boxed, kWasmF32, Float32) \
V(f64, kWasmF64, double) \
V(f64_boxed, kWasmF64, Float64) \
V(s128, kWasmS128, Simd128) \
V(anyref, kWasmAnyRef, Handle<Object>)
ASSERT_TRIVIALLY_COPYABLE(Handle<Object>);
// A wasm value with type information.
class WasmValue {
public:
WasmValue() : type_(kWasmStmt), bit_pattern_{} {}
#define DEFINE_TYPE_SPECIFIC_METHODS(name, localtype, ctype) \
explicit WasmValue(ctype v) : type_(localtype), bit_pattern_{} { \
static_assert(sizeof(ctype) <= sizeof(bit_pattern_), \
"size too big for WasmValue"); \
base::WriteUnalignedValue<ctype>(reinterpret_cast<Address>(bit_pattern_), \
v); \
} \
ctype to_##name() const { \
DCHECK_EQ(localtype, type_); \
return to_##name##_unchecked(); \
} \
ctype to_##name##_unchecked() const { \
return base::ReadUnalignedValue<ctype>( \
reinterpret_cast<Address>(bit_pattern_)); \
}
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_ &&
!memcmp(bit_pattern_, other.bit_pattern_, 16);
}
template <typename T>
inline T to() const;
template <typename T>
inline T to_unchecked() const;
private:
ValueType type_;
uint8_t bit_pattern_[16];
};
#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_WASM_VALUE_H_
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