| // Copyright 2016 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. |
| |
| #include <math.h> |
| #include <stdint.h> |
| #include <stdlib.h> |
| #include <limits> |
| |
| #include "include/v8config.h" |
| |
| #include "src/base/bits.h" |
| #include "src/base/ieee754.h" |
| #include "src/utils/memcopy.h" |
| |
| #if defined(ADDRESS_SANITIZER) || defined(MEMORY_SANITIZER) || \ |
| defined(THREAD_SANITIZER) || defined(LEAK_SANITIZER) || \ |
| defined(UNDEFINED_SANITIZER) |
| #define V8_WITH_SANITIZER |
| #endif |
| |
| #if defined(V8_OS_WIN) && defined(V8_WITH_SANITIZER) |
| // With ASAN on Windows we have to reset the thread-in-wasm flag. Exceptions |
| // caused by ASAN let the thread-in-wasm flag get out of sync. Even marking |
| // functions with DISABLE_ASAN is not sufficient when the compiler produces |
| // calls to memset. Therefore we add test-specific code for ASAN on |
| // Windows. |
| #define RESET_THREAD_IN_WASM_FLAG_FOR_ASAN_ON_WINDOWS |
| #include "src/trap-handler/trap-handler.h" |
| #endif |
| |
| #include "src/base/memory.h" |
| #include "src/utils/utils.h" |
| #include "src/wasm/wasm-external-refs.h" |
| |
| namespace v8 { |
| namespace internal { |
| namespace wasm { |
| |
| using base::ReadUnalignedValue; |
| using base::WriteUnalignedValue; |
| |
| void f32_trunc_wrapper(Address data) { |
| WriteUnalignedValue<float>(data, truncf(ReadUnalignedValue<float>(data))); |
| } |
| |
| void f32_floor_wrapper(Address data) { |
| WriteUnalignedValue<float>(data, floorf(ReadUnalignedValue<float>(data))); |
| } |
| |
| void f32_ceil_wrapper(Address data) { |
| WriteUnalignedValue<float>(data, ceilf(ReadUnalignedValue<float>(data))); |
| } |
| |
| void f32_nearest_int_wrapper(Address data) { |
| WriteUnalignedValue<float>(data, nearbyintf(ReadUnalignedValue<float>(data))); |
| } |
| |
| void f64_trunc_wrapper(Address data) { |
| WriteUnalignedValue<double>(data, trunc(ReadUnalignedValue<double>(data))); |
| } |
| |
| void f64_floor_wrapper(Address data) { |
| WriteUnalignedValue<double>(data, floor(ReadUnalignedValue<double>(data))); |
| } |
| |
| void f64_ceil_wrapper(Address data) { |
| WriteUnalignedValue<double>(data, ceil(ReadUnalignedValue<double>(data))); |
| } |
| |
| void f64_nearest_int_wrapper(Address data) { |
| WriteUnalignedValue<double>(data, |
| nearbyint(ReadUnalignedValue<double>(data))); |
| } |
| |
| void int64_to_float32_wrapper(Address data) { |
| int64_t input = ReadUnalignedValue<int64_t>(data); |
| WriteUnalignedValue<float>(data, static_cast<float>(input)); |
| } |
| |
| void uint64_to_float32_wrapper(Address data) { |
| uint64_t input = ReadUnalignedValue<uint64_t>(data); |
| float result = static_cast<float>(input); |
| |
| #if V8_CC_MSVC |
| // With MSVC we use static_cast<float>(uint32_t) instead of |
| // static_cast<float>(uint64_t) to achieve round-to-nearest-ties-even |
| // semantics. The idea is to calculate |
| // static_cast<float>(high_word) * 2^32 + static_cast<float>(low_word). To |
| // achieve proper rounding in all cases we have to adjust the high_word |
| // with a "rounding bit" sometimes. The rounding bit is stored in the LSB of |
| // the high_word if the low_word may affect the rounding of the high_word. |
| uint32_t low_word = static_cast<uint32_t>(input & 0xFFFFFFFF); |
| uint32_t high_word = static_cast<uint32_t>(input >> 32); |
| |
| float shift = static_cast<float>(1ull << 32); |
| // If the MSB of the high_word is set, then we make space for a rounding bit. |
| if (high_word < 0x80000000) { |
| high_word <<= 1; |
| shift = static_cast<float>(1ull << 31); |
| } |
| |
| if ((high_word & 0xFE000000) && low_word) { |
| // Set the rounding bit. |
| high_word |= 1; |
| } |
| |
| result = static_cast<float>(high_word); |
| result *= shift; |
| result += static_cast<float>(low_word); |
| #endif |
| |
| WriteUnalignedValue<float>(data, result); |
| } |
| |
| void int64_to_float64_wrapper(Address data) { |
| int64_t input = ReadUnalignedValue<int64_t>(data); |
| WriteUnalignedValue<double>(data, static_cast<double>(input)); |
| } |
| |
| void uint64_to_float64_wrapper(Address data) { |
| uint64_t input = ReadUnalignedValue<uint64_t>(data); |
| double result = static_cast<double>(input); |
| |
| #if V8_CC_MSVC |
| // With MSVC we use static_cast<double>(uint32_t) instead of |
| // static_cast<double>(uint64_t) to achieve round-to-nearest-ties-even |
| // semantics. The idea is to calculate |
| // static_cast<double>(high_word) * 2^32 + static_cast<double>(low_word). |
| uint32_t low_word = static_cast<uint32_t>(input & 0xFFFFFFFF); |
| uint32_t high_word = static_cast<uint32_t>(input >> 32); |
| |
| double shift = static_cast<double>(1ull << 32); |
| |
| result = static_cast<double>(high_word); |
| result *= shift; |
| result += static_cast<double>(low_word); |
| #endif |
| |
| WriteUnalignedValue<double>(data, result); |
| } |
| |
| int32_t float32_to_int64_wrapper(Address data) { |
| // We use "<" here to check the upper bound because of rounding problems: With |
| // "<=" some inputs would be considered within int64 range which are actually |
| // not within int64 range. |
| float input = ReadUnalignedValue<float>(data); |
| if (input >= static_cast<float>(std::numeric_limits<int64_t>::min()) && |
| input < static_cast<float>(std::numeric_limits<int64_t>::max())) { |
| WriteUnalignedValue<int64_t>(data, static_cast<int64_t>(input)); |
| return 1; |
| } |
| return 0; |
| } |
| |
| int32_t float32_to_uint64_wrapper(Address data) { |
| float input = ReadUnalignedValue<float>(data); |
| // We use "<" here to check the upper bound because of rounding problems: With |
| // "<=" some inputs would be considered within uint64 range which are actually |
| // not within uint64 range. |
| if (input > -1.0 && |
| input < static_cast<float>(std::numeric_limits<uint64_t>::max())) { |
| WriteUnalignedValue<uint64_t>(data, static_cast<uint64_t>(input)); |
| return 1; |
| } |
| return 0; |
| } |
| |
| int32_t float64_to_int64_wrapper(Address data) { |
| // We use "<" here to check the upper bound because of rounding problems: With |
| // "<=" some inputs would be considered within int64 range which are actually |
| // not within int64 range. |
| double input = ReadUnalignedValue<double>(data); |
| if (input >= static_cast<double>(std::numeric_limits<int64_t>::min()) && |
| input < static_cast<double>(std::numeric_limits<int64_t>::max())) { |
| WriteUnalignedValue<int64_t>(data, static_cast<int64_t>(input)); |
| return 1; |
| } |
| return 0; |
| } |
| |
| int32_t float64_to_uint64_wrapper(Address data) { |
| // We use "<" here to check the upper bound because of rounding problems: With |
| // "<=" some inputs would be considered within uint64 range which are actually |
| // not within uint64 range. |
| double input = ReadUnalignedValue<double>(data); |
| if (input > -1.0 && |
| input < static_cast<double>(std::numeric_limits<uint64_t>::max())) { |
| WriteUnalignedValue<uint64_t>(data, static_cast<uint64_t>(input)); |
| return 1; |
| } |
| return 0; |
| } |
| |
| int32_t int64_div_wrapper(Address data) { |
| int64_t dividend = ReadUnalignedValue<int64_t>(data); |
| int64_t divisor = ReadUnalignedValue<int64_t>(data + sizeof(dividend)); |
| if (divisor == 0) { |
| return 0; |
| } |
| if (divisor == -1 && dividend == std::numeric_limits<int64_t>::min()) { |
| return -1; |
| } |
| WriteUnalignedValue<int64_t>(data, dividend / divisor); |
| return 1; |
| } |
| |
| int32_t int64_mod_wrapper(Address data) { |
| int64_t dividend = ReadUnalignedValue<int64_t>(data); |
| int64_t divisor = ReadUnalignedValue<int64_t>(data + sizeof(dividend)); |
| if (divisor == 0) { |
| return 0; |
| } |
| WriteUnalignedValue<int64_t>(data, dividend % divisor); |
| return 1; |
| } |
| |
| int32_t uint64_div_wrapper(Address data) { |
| uint64_t dividend = ReadUnalignedValue<uint64_t>(data); |
| uint64_t divisor = ReadUnalignedValue<uint64_t>(data + sizeof(dividend)); |
| if (divisor == 0) { |
| return 0; |
| } |
| WriteUnalignedValue<uint64_t>(data, dividend / divisor); |
| return 1; |
| } |
| |
| int32_t uint64_mod_wrapper(Address data) { |
| uint64_t dividend = ReadUnalignedValue<uint64_t>(data); |
| uint64_t divisor = ReadUnalignedValue<uint64_t>(data + sizeof(dividend)); |
| if (divisor == 0) { |
| return 0; |
| } |
| WriteUnalignedValue<uint64_t>(data, dividend % divisor); |
| return 1; |
| } |
| |
| uint32_t word32_ctz_wrapper(Address data) { |
| return base::bits::CountTrailingZeros(ReadUnalignedValue<uint32_t>(data)); |
| } |
| |
| uint32_t word64_ctz_wrapper(Address data) { |
| return base::bits::CountTrailingZeros(ReadUnalignedValue<uint64_t>(data)); |
| } |
| |
| uint32_t word32_popcnt_wrapper(Address data) { |
| return base::bits::CountPopulation(ReadUnalignedValue<uint32_t>(data)); |
| } |
| |
| uint32_t word64_popcnt_wrapper(Address data) { |
| return base::bits::CountPopulation(ReadUnalignedValue<uint64_t>(data)); |
| } |
| |
| uint32_t word32_rol_wrapper(Address data) { |
| uint32_t input = ReadUnalignedValue<uint32_t>(data); |
| uint32_t shift = ReadUnalignedValue<uint32_t>(data + sizeof(input)) & 31; |
| return (input << shift) | (input >> ((32 - shift) & 31)); |
| } |
| |
| uint32_t word32_ror_wrapper(Address data) { |
| uint32_t input = ReadUnalignedValue<uint32_t>(data); |
| uint32_t shift = ReadUnalignedValue<uint32_t>(data + sizeof(input)) & 31; |
| return (input >> shift) | (input << ((32 - shift) & 31)); |
| } |
| |
| void float64_pow_wrapper(Address data) { |
| double x = ReadUnalignedValue<double>(data); |
| double y = ReadUnalignedValue<double>(data + sizeof(x)); |
| WriteUnalignedValue<double>(data, base::ieee754::pow(x, y)); |
| } |
| |
| // Asan on Windows triggers exceptions in this function to allocate |
| // shadow memory lazily. When this function is called from WebAssembly, |
| // these exceptions would be handled by the trap handler before they get |
| // handled by Asan, and thereby confuse the thread-in-wasm flag. |
| // Therefore we disable ASAN for this function. Alternatively we could |
| // reset the thread-in-wasm flag before calling this function. However, |
| // as this is only a problem with Asan on Windows, we did not consider |
| // it worth the overhead. |
| DISABLE_ASAN void memory_copy_wrapper(Address dst, Address src, uint32_t size) { |
| // Use explicit forward and backward copy to match the required semantics for |
| // the memory.copy instruction. It is assumed that the caller of this |
| // function has already performed bounds checks, so {src + size} and |
| // {dst + size} should not overflow. |
| DCHECK(src + size >= src && dst + size >= dst); |
| uint8_t* dst8 = reinterpret_cast<uint8_t*>(dst); |
| uint8_t* src8 = reinterpret_cast<uint8_t*>(src); |
| if (src < dst && src + size > dst && dst + size > src) { |
| dst8 += size - 1; |
| src8 += size - 1; |
| for (; size > 0; size--) { |
| *dst8-- = *src8--; |
| } |
| } else { |
| for (; size > 0; size--) { |
| *dst8++ = *src8++; |
| } |
| } |
| } |
| |
| // Asan on Windows triggers exceptions in this function that confuse the |
| // WebAssembly trap handler, so Asan is disabled. See the comment on |
| // memory_copy_wrapper above for more info. |
| void memory_fill_wrapper(Address dst, uint32_t value, uint32_t size) { |
| #if defined(RESET_THREAD_IN_WASM_FLAG_FOR_ASAN_ON_WINDOWS) |
| bool thread_was_in_wasm = trap_handler::IsThreadInWasm(); |
| if (thread_was_in_wasm) { |
| trap_handler::ClearThreadInWasm(); |
| } |
| #endif |
| |
| // Use an explicit forward copy to match the required semantics for the |
| // memory.fill instruction. It is assumed that the caller of this function |
| // has already performed bounds checks, so {dst + size} should not overflow. |
| DCHECK(dst + size >= dst); |
| uint8_t* dst8 = reinterpret_cast<uint8_t*>(dst); |
| uint8_t value8 = static_cast<uint8_t>(value); |
| for (; size > 0; size--) { |
| *dst8++ = value8; |
| } |
| #if defined(RESET_THREAD_IN_WASM_FLAG_FOR_ASAN_ON_WINDOWS) |
| if (thread_was_in_wasm) { |
| trap_handler::SetThreadInWasm(); |
| } |
| #endif |
| } |
| |
| static WasmTrapCallbackForTesting wasm_trap_callback_for_testing = nullptr; |
| |
| void set_trap_callback_for_testing(WasmTrapCallbackForTesting callback) { |
| wasm_trap_callback_for_testing = callback; |
| } |
| |
| void call_trap_callback_for_testing() { |
| if (wasm_trap_callback_for_testing) { |
| wasm_trap_callback_for_testing(); |
| } |
| } |
| |
| } // namespace wasm |
| } // namespace internal |
| } // namespace v8 |
| |
| #undef V8_WITH_SANITIZER |
| #undef RESET_THREAD_IN_WASM_FLAG_FOR_ASAN_ON_WINDOWS |