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// Copyright Joyent, Inc. and other Node contributors.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to permit
// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
// USE OR OTHER DEALINGS IN THE SOFTWARE.
#ifndef SRC_NODE_INTERNALS_H_
#define SRC_NODE_INTERNALS_H_
#include <assert.h>
#include <stdlib.h>
#include "v8.h"
namespace node {
// Defined in node.cc
extern v8::Isolate* node_isolate;
// Defined in node.cc at startup.
extern v8::Persistent<v8::Object> process_p;
template <typename TypeName>
class CachedBase {
public:
CachedBase();
operator v8::Handle<TypeName>() const;
void operator=(v8::Handle<TypeName> that); // Can only assign once.
bool IsEmpty() const;
private:
CachedBase(const CachedBase&);
void operator=(const CachedBase&);
v8::Persistent<TypeName> handle_;
};
template <typename TypeName>
class Cached : public CachedBase<TypeName> {
public:
operator v8::Handle<v8::Value>() const;
void operator=(v8::Handle<TypeName> that);
};
template <>
class Cached<v8::Value> : public CachedBase<v8::Value> {
public:
operator v8::Handle<v8::Value>() const;
void operator=(v8::Handle<v8::Value> that);
};
template <class TypeName>
inline v8::Local<TypeName> PersistentToLocal(
const v8::Persistent<TypeName>& persistent);
template <class TypeName>
inline v8::Local<TypeName> PersistentToLocal(
v8::Isolate* isolate,
const v8::Persistent<TypeName>& persistent);
template <typename TypeName>
v8::Handle<v8::Value> MakeCallback(
const v8::Persistent<v8::Object>& recv,
const TypeName method,
int argc,
v8::Handle<v8::Value>* argv);
template <typename TypeName>
v8::Handle<v8::Value> MakeCallback(
const v8::Persistent<v8::Object>& recv,
const Cached<TypeName>& method,
int argc,
v8::Handle<v8::Value>* argv);
inline bool HasInstance(v8::Persistent<v8::FunctionTemplate>& function_template,
v8::Handle<v8::Value> value);
inline v8::Local<v8::Object> NewInstance(v8::Persistent<v8::Function>& ctor,
int argc = 0,
v8::Handle<v8::Value>* argv = NULL);
#ifdef _WIN32
// emulate snprintf() on windows, _snprintf() doesn't zero-terminate the buffer
// on overflow...
#include <stdarg.h>
inline static int snprintf(char* buf, unsigned int len, const char* fmt, ...) {
va_list ap;
va_start(ap, fmt);
int n = _vsprintf_p(buf, len, fmt, ap);
if (len) buf[len - 1] = '\0';
va_end(ap);
return n;
}
#endif
#if defined(__x86_64__)
# define BITS_PER_LONG 64
#else
# define BITS_PER_LONG 32
#endif
#ifndef offset_of
// g++ in strict mode complains loudly about the system offsetof() macro
// because it uses NULL as the base address.
# define offset_of(type, member) \
((intptr_t) ((char *) &(((type *) 8)->member) - 8))
#endif
#ifndef container_of
# define container_of(ptr, type, member) \
((type *) ((char *) (ptr) - offset_of(type, member)))
#endif
#ifndef ARRAY_SIZE
# define ARRAY_SIZE(a) (sizeof((a)) / sizeof((a)[0]))
#endif
#ifndef ROUND_UP
# define ROUND_UP(a, b) ((a) % (b) ? ((a) + (b)) - ((a) % (b)) : (a))
#endif
#if defined(__GNUC__) && __GNUC__ >= 4
# define MUST_USE_RESULT __attribute__((warn_unused_result))
# define NO_RETURN __attribute__((noreturn))
#else
# define MUST_USE_RESULT
# define NO_RETURN
#endif
// this would have been a template function were it not for the fact that g++
// sometimes fails to resolve it...
#define THROW_ERROR(fun) \
do { \
v8::HandleScope scope(node_isolate); \
v8::ThrowException(fun(v8::String::New(errmsg))); \
} \
while (0)
inline static void ThrowError(const char* errmsg) {
THROW_ERROR(v8::Exception::Error);
}
inline static void ThrowTypeError(const char* errmsg) {
THROW_ERROR(v8::Exception::TypeError);
}
inline static void ThrowRangeError(const char* errmsg) {
THROW_ERROR(v8::Exception::RangeError);
}
inline static void ThrowErrnoException(int errorno,
const char* syscall = NULL,
const char* message = NULL,
const char* path = NULL) {
v8::ThrowException(ErrnoException(errorno, syscall, message, path));
}
inline static void ThrowUVException(int errorno,
const char* syscall = NULL,
const char* message = NULL,
const char* path = NULL) {
v8::ThrowException(UVException(errorno, syscall, message, path));
}
NO_RETURN void FatalError(const char* location, const char* message);
#define UNWRAP(type) \
assert(!args.This().IsEmpty()); \
assert(args.This()->InternalFieldCount() > 0); \
type* wrap = static_cast<type*>( \
args.This()->GetAlignedPointerFromInternalField(0)); \
if (!wrap) { \
fprintf(stderr, #type ": Aborting due to unwrap failure at %s:%d\n", \
__FILE__, __LINE__); \
abort(); \
}
// allow for quick domain check
extern bool using_domains;
enum Endianness {
kLittleEndian, // _Not_ LITTLE_ENDIAN, clashes with endian.h.
kBigEndian
};
inline enum Endianness GetEndianness() {
// Constant-folded by the compiler.
const union {
uint8_t u8[2];
uint16_t u16;
} u = {
{ 1, 0 }
};
return u.u16 == 1 ? kLittleEndian : kBigEndian;
}
inline bool IsLittleEndian() {
return GetEndianness() == kLittleEndian;
}
inline bool IsBigEndian() {
return GetEndianness() == kBigEndian;
}
// parse index for external array data
inline MUST_USE_RESULT bool ParseArrayIndex(v8::Handle<v8::Value> arg,
size_t def,
size_t* ret) {
if (arg->IsUndefined()) {
*ret = def;
return true;
}
int32_t tmp_i = arg->Int32Value();
if (tmp_i < 0)
return false;
*ret = static_cast<size_t>(tmp_i);
return true;
}
template <class TypeName>
inline v8::Local<TypeName> PersistentToLocal(
const v8::Persistent<TypeName>& persistent) {
return PersistentToLocal(node_isolate, persistent);
}
template <class TypeName>
inline v8::Local<TypeName> PersistentToLocal(
v8::Isolate* isolate,
const v8::Persistent<TypeName>& persistent) {
if (persistent.IsWeak()) {
return v8::Local<TypeName>::New(isolate, persistent);
} else {
return *reinterpret_cast<v8::Local<TypeName>*>(
const_cast<v8::Persistent<TypeName>*>(&persistent));
}
}
template <typename TypeName>
CachedBase<TypeName>::CachedBase() {
}
template <typename TypeName>
CachedBase<TypeName>::operator v8::Handle<TypeName>() const {
return PersistentToLocal(handle_);
}
template <typename TypeName>
void CachedBase<TypeName>::operator=(v8::Handle<TypeName> that) {
assert(handle_.IsEmpty() == true); // Can only assign once.
handle_.Reset(node_isolate, that);
}
template <typename TypeName>
bool CachedBase<TypeName>::IsEmpty() const {
return handle_.IsEmpty();
}
template <typename TypeName>
Cached<TypeName>::operator v8::Handle<v8::Value>() const {
return CachedBase<TypeName>::operator v8::Handle<TypeName>();
}
template <typename TypeName>
void Cached<TypeName>::operator=(v8::Handle<TypeName> that) {
CachedBase<TypeName>::operator=(that);
}
inline Cached<v8::Value>::operator v8::Handle<v8::Value>() const {
return CachedBase<v8::Value>::operator v8::Handle<v8::Value>();
}
inline void Cached<v8::Value>::operator=(v8::Handle<v8::Value> that) {
CachedBase<v8::Value>::operator=(that);
}
template <typename TypeName>
v8::Handle<v8::Value> MakeCallback(
const v8::Persistent<v8::Object>& recv,
const TypeName method,
int argc,
v8::Handle<v8::Value>* argv) {
v8::Local<v8::Object> recv_obj = PersistentToLocal(recv);
return MakeCallback(recv_obj, method, argc, argv);
}
template <typename TypeName>
v8::Handle<v8::Value> MakeCallback(
const v8::Persistent<v8::Object>& recv,
const Cached<TypeName>& method,
int argc,
v8::Handle<v8::Value>* argv) {
const v8::Handle<TypeName> handle = method;
return MakeCallback(recv, handle, argc, argv);
}
inline bool HasInstance(v8::Persistent<v8::FunctionTemplate>& function_template,
v8::Handle<v8::Value> value) {
v8::Local<v8::FunctionTemplate> function_template_handle =
PersistentToLocal(function_template);
return function_template_handle->HasInstance(value);
}
inline v8::Local<v8::Object> NewInstance(v8::Persistent<v8::Function>& ctor,
int argc,
v8::Handle<v8::Value>* argv) {
v8::Local<v8::Function> constructor_handle = PersistentToLocal(ctor);
return constructor_handle->NewInstance(argc, argv);
}
} // namespace node
#endif // SRC_NODE_INTERNALS_H_
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