Line data    Source code

       1             : // Copyright 2017 the V8 project authors. All rights reserved.
       2             : // Use of this source code is governed by a BSD-style license that can be
       3             : // found in the LICENSE file.
       4             : 
       5             : #ifndef V8_WASM_WASM_VALUE_H_
       6             : #define V8_WASM_WASM_VALUE_H_
       7             : 
       8             : #include "src/boxed-float.h"
       9             : #include "src/v8memory.h"
      10             : #include "src/wasm/wasm-opcodes.h"
      11             : #include "src/zone/zone-containers.h"
      12             : 
      13             : namespace v8 {
      14             : namespace internal {
      15             : namespace wasm {
      16             : 
      17             : #define FOREACH_SIMD_TYPE(V) \
      18             :   V(float, float4, f32x4, 4) \
      19             :   V(int32_t, int4, i32x4, 4) \
      20             :   V(int16_t, int8, i16x8, 8) \
      21             :   V(int8_t, int16, i8x16, 16)
      22             : 
      23             : #define DEFINE_SIMD_TYPE(cType, sType, name, kSize) \
      24             :   struct sType {                                    \
      25             :     cType val[kSize];                               \
      26             :   };
      27             : FOREACH_SIMD_TYPE(DEFINE_SIMD_TYPE)
      28             : #undef DEFINE_SIMD_TYPE
      29             : 
      30             : class Simd128 {
      31             :  public:
      32    97130816 :   Simd128() : val_() {
      33    97130816 :     for (size_t i = 0; i < 16; i++) {
      34    97130816 :       val_[i] = 0;
      35             :     }
      36             :   }
      37             : #define DEFINE_SIMD_TYPE_SPECIFIC_METHODS(cType, sType, name, size)    \
      38             :   explicit Simd128(sType val) {                                        \
      39             :     WriteUnalignedValue<sType>(reinterpret_cast<Address>(val_), val);  \
      40             :   }                                                                    \
      41             :   sType to_##name() {                                                  \
      42             :     return ReadUnalignedValue<sType>(reinterpret_cast<Address>(val_)); \
      43             :   }
      44             :   FOREACH_SIMD_TYPE(DEFINE_SIMD_TYPE_SPECIFIC_METHODS)
      45             : #undef DEFINE_SIMD_TYPE_SPECIFIC_METHODS
      46             : 
      47             :  private:
      48             :   uint8_t val_[16];
      49             : };
      50             : 
      51             : // Macro for defining WasmValue methods for different types.
      52             : // Elements:
      53             : // - name (for to_<name>() method)
      54             : // - wasm type
      55             : // - c type
      56             : #define FOREACH_WASMVAL_TYPE(V)   \
      57             :   V(i32, kWasmI32, int32_t)       \
      58             :   V(u32, kWasmI32, uint32_t)      \
      59             :   V(i64, kWasmI64, int64_t)       \
      60             :   V(u64, kWasmI64, uint64_t)      \
      61             :   V(f32, kWasmF32, float)         \
      62             :   V(f32_boxed, kWasmF32, Float32) \
      63             :   V(f64, kWasmF64, double)        \
      64             :   V(f64_boxed, kWasmF64, Float64) \
      65             :   V(s128, kWasmS128, Simd128)
      66             : 
      67             : // A wasm value with type information.
      68             : class WasmValue {
      69             :  public:
      70    19313612 :   WasmValue() : type_(kWasmStmt), bit_pattern_{} {}
      71             : 
      72             : #define DEFINE_TYPE_SPECIFIC_METHODS(name, localtype, ctype)                   \
      73             :   explicit WasmValue(ctype v) : type_(localtype), bit_pattern_{} {             \
      74             :     static_assert(sizeof(ctype) <= sizeof(bit_pattern_),                       \
      75             :                   "size too big for WasmValue");                               \
      76             :     WriteUnalignedValue<ctype>(reinterpret_cast<Address>(bit_pattern_), v);    \
      77             :   }                                                                            \
      78             :   ctype to_##name() const {                                                    \
      79             :     DCHECK_EQ(localtype, type_);                                               \
      80             :     return to_##name##_unchecked();                                            \
      81             :   }                                                                            \
      82             :   ctype to_##name##_unchecked() const {                                        \
      83             :     return ReadUnalignedValue<ctype>(reinterpret_cast<Address>(bit_pattern_)); \
      84             :   }
      85    92239984 :   FOREACH_WASMVAL_TYPE(DEFINE_TYPE_SPECIFIC_METHODS)
      86             : #undef DEFINE_TYPE_SPECIFIC_METHODS
      87             : 
      88             :   ValueType type() const { return type_; }
      89             : 
      90             :   // Checks equality of type and bit pattern (also for float and double values).
      91         416 :   bool operator==(const WasmValue& other) const {
      92         832 :     return type_ == other.type_ &&
      93         832 :            !memcmp(bit_pattern_, other.bit_pattern_, 16);
      94             :   }
      95             : 
      96             :   template <typename T>
      97             :   inline T to() const;
      98             : 
      99             :   template <typename T>
     100             :   inline T to_unchecked() const;
     101             : 
     102             :  private:
     103             :   ValueType type_;
     104             :   uint8_t bit_pattern_[16];
     105             : };
     106             : 
     107             : #define DECLARE_CAST(name, localtype, ctype, ...) \
     108             :   template <>                                     \
     109             :   inline ctype WasmValue::to_unchecked() const {  \
     110             :     return to_##name##_unchecked();               \
     111             :   }                                               \
     112             :   template <>                                     \
     113             :   inline ctype WasmValue::to() const {            \
     114             :     return to_##name();                           \
     115             :   }
     116        6840 : FOREACH_WASMVAL_TYPE(DECLARE_CAST)
     117             : #undef DECLARE_CAST
     118             : 
     119             : }  // namespace wasm
     120             : }  // namespace internal
     121             : }  // namespace v8
     122             : 
     123             : #endif  // V8_WASM_WASM_VALUE_H_