v8js/v8js_v8.cc

/*
  +----------------------------------------------------------------------+
  | PHP Version 5                                                        |
  +----------------------------------------------------------------------+
  | Copyright (c) 1997-2016 The PHP Group                                |
  +----------------------------------------------------------------------+
  | http://www.opensource.org/licenses/mit-license.php  MIT License      |
  +----------------------------------------------------------------------+
  | Author: Jani Taskinen <[email protected]>                         |
  | Author: Patrick Reilly <[email protected]>                             |
  | Author: Stefan Siegl <[email protected]>                                |
  +----------------------------------------------------------------------+
*/

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

extern "C" {
#include "php.h"
#include "ext/date/php_date.h"
#include "ext/standard/php_string.h"
#include "zend_interfaces.h"
#include "zend_closures.h"
#include "zend_exceptions.h"
}

#if !defined(_WIN32) && PHP_V8_API_VERSION >= 3029036
#include <libplatform/libplatform.h>
#endif

#include "php_v8js_macros.h"
#include "v8js_v8.h"
#include "v8js_timer.h"
#include "v8js_exceptions.h"

#if defined(PHP_V8_USE_EXTERNAL_STARTUP_DATA) && PHP_V8_API_VERSION < 4006076
/* Old V8 version, requires startup data but has no
 * (internal/API) means to let it be loaded. */
static v8::StartupData natives_;
static v8::StartupData snapshot_;

static void v8js_v8_load_startup_data(const char* blob_file,
									  v8::StartupData* startup_data,
									  void (*setter_fn)(v8::StartupData*)) {
	startup_data->data = NULL;
	startup_data->raw_size = 0;

	if (!blob_file) {
		return;
	}

	FILE* file = fopen(blob_file, "rb");
	if (!file) {
		return;
	}

	fseek(file, 0, SEEK_END);
	startup_data->raw_size = static_cast<int>(ftell(file));
	rewind(file);

	startup_data->data = new char[startup_data->raw_size];
	int read_size = static_cast<int>(fread(const_cast<char*>(startup_data->data),
										   1, startup_data->raw_size, file));
	fclose(file);

	if (startup_data->raw_size == read_size) {
		(*setter_fn)(startup_data);
	}
}
#endif


void v8js_v8_init(TSRMLS_D) /* {{{ */
{
	/* Run only once; thread-local test first */
	if (V8JSG(v8_initialized)) {
		return;
	}

	/* Set thread-local flag, that V8 was initialized. */
	V8JSG(v8_initialized) = 1;

#ifdef ZTS
	v8js_process_globals.lock.lock();

	if(v8js_process_globals.v8_initialized) {
		/* V8 already has been initialized by another thread */
		v8js_process_globals.lock.unlock();
		return;
	}
#endif

#ifdef PHP_V8_USE_EXTERNAL_STARTUP_DATA
	/* V8 doesn't work without startup data, load it. */
#if PHP_V8_API_VERSION >= 4006076
	v8::V8::InitializeExternalStartupData(
		PHP_V8_NATIVES_BLOB_PATH,
		PHP_V8_SNAPSHOT_BLOB_PATH
	);
#else
	v8js_v8_load_startup_data(PHP_V8_NATIVES_BLOB_PATH, &natives_, v8::V8::SetNativesDataBlob);
	v8js_v8_load_startup_data(PHP_V8_SNAPSHOT_BLOB_PATH, &snapshot_, v8::V8::SetSnapshotDataBlob);
#endif
#endif

#if !defined(_WIN32) && PHP_V8_API_VERSION >= 3029036
	v8js_process_globals.v8_platform = v8::platform::CreateDefaultPlatform();
	v8::V8::InitializePlatform(v8js_process_globals.v8_platform);
#endif

	/* Set V8 command line flags (must be done before V8::Initialize()!) */
	if (v8js_process_globals.v8_flags) {
		v8::V8::SetFlagsFromString(v8js_process_globals.v8_flags,
								   strlen(v8js_process_globals.v8_flags));
	}

	/* Initialize V8 */
	v8::V8::Initialize();

#ifdef ZTS
	v8js_process_globals.v8_initialized = 1;
	v8js_process_globals.lock.unlock();
#endif
}
/* }}} */


void v8js_v8_call(v8js_ctx *c, zval **return_value,
				  long flags, long time_limit, long memory_limit,
				  std::function< v8::Local<v8::Value>(v8::Isolate *) >& v8_call TSRMLS_DC) /* {{{ */
{
	char *tz = NULL;

	V8JS_CTX_PROLOGUE(c);

	V8JSG(timer_mutex).lock();
	c->time_limit_hit = false;
	c->memory_limit_hit = false;
	V8JSG(timer_mutex).unlock();

	/* Catch JS exceptions */
	v8::TryCatch try_catch;

	/* Set flags for runtime use */
	c->flags = flags;

	/* Check if timezone has been changed and notify V8 */
	tz = getenv("TZ");

	if (tz != NULL) {
		if (c->tz == NULL) {
			c->tz = strdup(tz);
		}
		else if (strcmp(c->tz, tz) != 0) {
			v8::Date::DateTimeConfigurationChangeNotification(c->isolate);

			free(c->tz);
			c->tz = strdup(tz);
		}
	}

	if (time_limit > 0 || memory_limit > 0) {
		// If timer thread is not running then start it
		if (!V8JSG(timer_thread)) {
			// If not, start timer thread
			V8JSG(timer_thread) = new std::thread(v8js_timer_thread TSRMLS_CC);
		}
	}

	/* Always pass the timer to the stack so there can be follow-up changes to
	 * the time & memory limit. */
	v8js_timer_push(time_limit, memory_limit, c TSRMLS_CC);

	/* Execute script */
	c->in_execution++;
	v8::Local<v8::Value> result = v8_call(c->isolate);
	c->in_execution--;

	/* Pop our context from the stack and read (possibly updated) limits
	 * into local variables. */
	V8JSG(timer_mutex).lock();
	v8js_timer_ctx *timer_ctx = V8JSG(timer_stack).front();
	V8JSG(timer_stack).pop_front();
	V8JSG(timer_mutex).unlock();

	time_limit = timer_ctx->time_limit;
	memory_limit = timer_ctx->memory_limit;

	efree(timer_ctx);

	/* Check for fatal error marker possibly set by v8js_error_handler; just
	 * rethrow the error since we're now out of V8. */
	if(V8JSG(fatal_error_abort)) {
		zend_bailout();
	}

	char exception_string[64];

	if (c->time_limit_hit) {
		// Execution has been terminated due to time limit
		sprintf(exception_string, "Script time limit of %lu milliseconds exceeded", time_limit);
		zend_throw_exception(php_ce_v8js_time_limit_exception, exception_string, 0 TSRMLS_CC);
		return;
	}

	if (memory_limit && !c->memory_limit_hit) {
		// Re-check memory limit (very short executions might never be hit by timer thread)
		v8::HeapStatistics hs;
		isolate->GetHeapStatistics(&hs);

		if (hs.used_heap_size() > memory_limit) {
#if PHP_V8_API_VERSION >= 3028036
			isolate->LowMemoryNotification();
#else
			v8::V8::LowMemoryNotification();
#endif
			isolate->GetHeapStatistics(&hs);

			if (hs.used_heap_size() > memory_limit) {
				c->memory_limit_hit = true;
			}
		}
	}

	if (c->memory_limit_hit) {
		// Execution has been terminated due to memory limit
		sprintf(exception_string, "Script memory limit of %lu bytes exceeded", memory_limit);
		zend_throw_exception(php_ce_v8js_memory_limit_exception, exception_string, 0 TSRMLS_CC);
		return;
	}

	if (!try_catch.CanContinue()) {
		// At this point we can't re-throw the exception
		return;
	}

	/* There was pending exception left from earlier executions -> throw to PHP */
	if (c->pending_exception) {
		zend_throw_exception_object(c->pending_exception TSRMLS_CC);
		c->pending_exception = NULL;
	}

	/* Handle runtime JS exceptions */
	if (try_catch.HasCaught()) {

		/* Pending exceptions are set only in outer caller, inner caller exceptions are always rethrown */
		if (c->in_execution < 1) {

			/* Report immediately if report_uncaught is true */
			if (c->report_uncaught) {
				v8js_throw_script_exception(c->isolate, &try_catch TSRMLS_CC);
				return;
			}

			/* Exception thrown from JS, preserve it for future execution */
			if (result.IsEmpty()) {
				MAKE_STD_ZVAL(c->pending_exception);
				v8js_create_script_exception(c->pending_exception, c->isolate, &try_catch TSRMLS_CC);
				return;
			}
		}

		/* Rethrow back to JS */
		try_catch.ReThrow();
		return;
	}

	/* Convert V8 value to PHP value */
	if (!result.IsEmpty()) {
		v8js_to_zval(result, *return_value, flags, c->isolate TSRMLS_CC);
	}
}
/* }}} */

void v8js_terminate_execution(v8::Isolate *isolate) /* {{{ */
{
	if(v8::V8::IsExecutionTerminating(isolate)) {
		/* Execution already terminating, needn't trigger it again and
		 * especially must not execute the spinning loop (which would cause
		 * crashes in V8 itself, at least with 4.2 and 4.3 version lines). */
		return;
	}

	/* Unfortunately just calling TerminateExecution on the isolate is not
	 * enough, since v8 just marks the thread as "to be aborted" and doesn't
	 * immediately do so.  Hence we enter an endless loop after signalling
	 * termination, so we definitely don't execute JS code after the exit()
	 * statement. */
	v8::Locker locker(isolate);
	v8::Isolate::Scope isolate_scope(isolate);
	v8::HandleScope handle_scope(isolate);

	v8::Local<v8::String> source = V8JS_STR("for(;;);");
	v8::Local<v8::Script> script = v8::Script::Compile(source);
	v8::V8::TerminateExecution(isolate);
	script->Run();
}
/* }}} */


int v8js_get_properties_hash(v8::Handle<v8::Value> jsValue, HashTable *retval, int flags, v8::Isolate *isolate TSRMLS_DC) /* {{{ */
{
	v8::Local<v8::Object> jsObj = jsValue->ToObject();

	if (!jsObj.IsEmpty()) {
		v8::Local<v8::Array> jsKeys = jsObj->GetPropertyNames();

		for (unsigned i = 0; i < jsKeys->Length(); i++)
		{
			v8::Local<v8::String> jsKey = jsKeys->Get(i)->ToString();

			/* Skip any prototype properties */
			if (!jsObj->HasOwnProperty(jsKey) && !jsObj->HasRealNamedProperty(jsKey) && !jsObj->HasRealNamedCallbackProperty(jsKey)) {
				continue;
			}

			v8::Local<v8::Value> jsVal = jsObj->Get(jsKey);
			v8::String::Utf8Value cstr(jsKey);
			const char *key = ToCString(cstr);
			zval *value = NULL;

			v8::Local<v8::Value> php_object;
			if (jsVal->IsObject()) {
				php_object = v8::Local<v8::Object>::Cast(jsVal)->GetHiddenValue(V8JS_SYM(PHPJS_OBJECT_KEY));
			}
			if (!php_object.IsEmpty()) {
				/* This is a PHP object, passed to JS and back. */
				value = reinterpret_cast<zval *>(v8::External::Cast(*php_object)->Value());
				Z_ADDREF_P(value);
			}
			else {
				MAKE_STD_ZVAL(value);

				if (v8js_to_zval(jsVal, value, flags, isolate TSRMLS_CC) == FAILURE) {
					zval_ptr_dtor(&value);
					return FAILURE;
				}
			}

			if ((flags & V8JS_FLAG_FORCE_ARRAY) || jsValue->IsArray()) {
				zend_symtable_update(retval, key, strlen(key) + 1, (void *)&value, sizeof(zval *), NULL);
			} else {
				zend_hash_update(retval, key, strlen(key) + 1, (void *) &value, sizeof(zval *), NULL);
			}
		}
		return SUCCESS;
	}
	return FAILURE;
}
/* }}} */




/*
 * Local variables:
 * tab-width: 4
 * c-basic-offset: 4
 * End:
 * vim600: noet sw=4 ts=4 fdm=marker
 * vim<600: noet sw=4 ts=4
 */