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/*
* Copyright 2016 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 wasm_support_utilities_h
#define wasm_support_utilities_h
#include "compiler-support.h"
#include <cassert>
#include <cstdint>
#include <cstring>
#include <memory>
#include <iostream>
#include <type_traits>
#include "support/bits.h"
namespace wasm {
// Type punning needs to be done through this function to avoid undefined
// behavior: unions and reinterpret_cast aren't valid approaches.
template<class Destination, class Source>
inline Destination bit_cast(const Source& source) {
static_assert(sizeof(Destination) == sizeof(Source),
"bit_cast needs to be between types of the same size");
static_assert(std::is_pod<Destination>::value, "non-POD bit_cast undefined");
static_assert(std::is_pod<Source>::value, "non-POD bit_cast undefined");
Destination destination;
std::memcpy(&destination, &source, sizeof(destination));
return destination;
}
inline size_t alignAddr(size_t address, size_t alignment) {
assert(alignment && IsPowerOf2((uint32_t)alignment) &&
"Alignment is not a power of two!");
assert(address + alignment - 1 >= address);
return ((address + alignment - 1) & ~(alignment - 1));
}
template<typename T, typename... Args>
std::unique_ptr<T> make_unique(Args&&... args)
{
return std::unique_ptr<T>(new T(std::forward<Args>(args)...));
}
// For fatal errors which could arise from input (i.e. not assertion failures)
class Fatal {
public:
Fatal() {
std::cerr << "Fatal: ";
}
template<typename T>
Fatal &operator<<(T arg) {
std::cerr << arg;
return *this;
}
WASM_NORETURN ~Fatal() {
std::cerr << "\n";
// Use _Exit here to avoid calling static destructors. This avoids deadlocks
// in (for example) the thread worker pool, where workers hold a lock while
// performing their work.
_Exit(1);
}
};
} // namespace wasm
#endif // wasm_support_utilities_h
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