PHP内核源码阅读过程（四）

这次来讲讲 zend_startup

int zend_startup(zend_utility_functions *utility_functions, char **extensions)

其第一个参数是一些基本的函数指针

 zuf.error_function = php_error_cb;zuf.printf_function = php_printf;zuf.write_function = php_output_wrapper;zuf.fopen_function = php_fopen_wrapper_for_zend;zuf.message_handler = php_message_handler_for_zend;zuf.get_configuration_directive = php_get_configuration_directive_for_zend;zuf.ticks_function = php_run_ticks;zuf.on_timeout = php_on_timeout;zuf.stream_open_function = php_stream_open_for_zend;zuf.printf_to_smart_string_function = php_printf_to_smart_string;zuf.printf_to_smart_str_function = php_printf_to_smart_str;zuf.getenv_function = sapi_getenv;zuf.resolve_path_function = php_resolve_path_for_zend;zend_startup(&zuf, NULL);

一、zend_cpu_startup 获取cpu支持的指令集

这个是通过"cpuid"指令获取本机cpu支持的指令集

#define __cpuid_count(level, count, a, b, c, d)      \__asm__ ("cpuid\n\t"                 \: "=a" (a), "=b" (b), "=c" (c), "=d" (d)   \: "0" (level), "2" (count))static void __zend_cpuid(uint32_t func, uint32_t subfunc, zend_cpu_info *cpuinfo) {__cpuid_count(func, subfunc, cpuinfo->eax, cpuinfo->ebx, cpuinfo->ecx, cpuinfo->edx);
}void zend_cpu_startup(void)
{if (!cpuinfo.initialized) {zend_cpu_info ebx;int max_feature;cpuinfo.initialized = 1;__zend_cpuid(0, 0, &cpuinfo); //获取最大功能号max_feature = cpuinfo.eax;if (max_feature == 0) {return;}__zend_cpuid(1, 0, &cpuinfo); //获取ecx和edx上的功能列表/* for avx2 */if (max_feature >= 7) {__zend_cpuid(7, 0, &ebx); //获取ebx上的功能列表cpuinfo.ebx = ebx.ebx;} else {cpuinfo.ebx = 0;}}
}

获取指令集的目的是为了优化字符串的处理，让一些操作直接由cpu指令完成，目前在两个地方使用: string和base64。

关于cpuid指令的详情，可以参考：CPUID

二、start_memory_manager 初始化内存管理器，这个话题很大，这里暂时不写。

三、virtual_cwd_startup 获取当前工作目录

将当前工作目录保存到全局变量 cwd_globals 中。

四、设置全局函数指针

 zend_error_cb = utility_functions->error_function;zend_printf = utility_functions->printf_function;zend_write = (zend_write_func_t) utility_functions->write_function;zend_fopen = utility_functions->fopen_function;if (!zend_fopen) {zend_fopen = zend_fopen_wrapper;}zend_stream_open_function = utility_functions->stream_open_function;zend_message_dispatcher_p = utility_functions->message_handler;zend_get_configuration_directive_p = utility_functions->get_configuration_directive;zend_ticks_function = utility_functions->ticks_function;zend_on_timeout = utility_functions->on_timeout;zend_printf_to_smart_string = utility_functions->printf_to_smart_string_function;zend_printf_to_smart_str = utility_functions->printf_to_smart_str_function;zend_getenv = utility_functions->getenv_function;zend_resolve_path = utility_functions->resolve_path_function;zend_interrupt_function = NULL;zend_compile_file = compile_file;zend_execute_ex = execute_ex;zend_execute_internal = NULL;zend_compile_string = compile_string;zend_throw_exception_hook = NULL;gc_collect_cycles = zend_gc_collect_cycles;

五、zend_vm_init 初始化php指令集

六、初始化一些全局变量

//版本信息
zend_version_info = strdup(ZEND_CORE_VERSION_INFO);
zend_version_info_length = sizeof(ZEND_CORE_VERSION_INFO) - 1;//全局函数表 compiler_globals.function_table
GLOBAL_FUNCTION_TABLE = (HashTable *) malloc(sizeof(HashTable));//全局类表 compiler_globals.class_table
GLOBAL_CLASS_TABLE = (HashTable *) malloc(sizeof(HashTable));//全局变量表 compiler_globals.auto_globals
GLOBAL_AUTO_GLOBALS_TABLE = (HashTable *) malloc(sizeof(HashTable));//全局常量表 executor_globals.zend_constants
GLOBAL_CONSTANTS_TABLE = (HashTable *) malloc(sizeof(HashTable));zend_hash_init_ex(GLOBAL_FUNCTION_TABLE, 1024, NULL, ZEND_FUNCTION_DTOR, 1, 0);
zend_hash_init_ex(GLOBAL_CLASS_TABLE, 64, NULL, ZEND_CLASS_DTOR, 1, 0);
zend_hash_init_ex(GLOBAL_AUTO_GLOBALS_TABLE, 8, NULL, auto_global_dtor, 1, 0);
zend_hash_init_ex(GLOBAL_CONSTANTS_TABLE, 128, NULL, ZEND_CONSTANT_DTOR, 1, 0);//注册的模块
zend_hash_init_ex(&module_registry, 32, NULL, module_destructor_zval, 1, 0);//初始化ini全局变量（词语和语法分析时用，实际未用到）
ini_scanner_globals_ctor(&ini_scanner_globals);//初始化语言分析阶段的全局变量
php_scanner_globals_ctor(&language_scanner_globals);//资源类型的变量释放函数
zend_init_rsrc_list_dtors();//设置默认编译时间
zend_set_default_compile_time_values();//默认的错误报告类型：除了notice，其他都报告。
EG(error_reporting) = E_ALL & ~E_NOTICE;

七、zend_interned_strings_init 初始化内部字符串

其主要功能：

1. 设置字符串初始化函数指针

 interned_string_request_handler = zend_new_interned_string_request;interned_string_init_request_handler = zend_string_init_interned_request;interned_string_copy_storage = NULL;interned_string_restore_storage = NULL;zend_new_interned_string = zend_new_interned_string_permanent;zend_string_init_interned = zend_string_init_interned_permanent;

2. 设置一些特殊的字符串

a. 空字符串

 zend_empty_string = NULL;str = zend_string_alloc(sizeof("")-1, 1);ZSTR_VAL(str)[0] = '\000';zend_empty_string = zend_new_interned_string_permanent(str);

b. 单字符的字符串

 char s[2];s[1] = 0;for (i = 0; i < 256; i++) {s[0] = i;zend_one_char_string[i] = zend_new_interned_string_permanent(zend_string_init(s, 1, 1));}

3. 设置内部预定义的字符串

#define ZEND_KNOWN_STRINGS(_) \_(ZEND_STR_FILE,                   "file") \_(ZEND_STR_LINE,                   "line") \_(ZEND_STR_FUNCTION,               "function") \_(ZEND_STR_CLASS,                  "class") \_(ZEND_STR_OBJECT,                 "object") \_(ZEND_STR_TYPE,                   "type") \_(ZEND_STR_OBJECT_OPERATOR,        "->") \_(ZEND_STR_PAAMAYIM_NEKUDOTAYIM,   "::") \_(ZEND_STR_ARGS,                   "args") \_(ZEND_STR_UNKNOWN,                "unknown") \_(ZEND_STR_EVAL,                   "eval") \_(ZEND_STR_INCLUDE,                "include") \_(ZEND_STR_REQUIRE,                "require") \_(ZEND_STR_INCLUDE_ONCE,           "include_once") \_(ZEND_STR_REQUIRE_ONCE,           "require_once") \_(ZEND_STR_SCALAR,                 "scalar") \_(ZEND_STR_ERROR_REPORTING,        "error_reporting") \_(ZEND_STR_STATIC,                 "static") \_(ZEND_STR_THIS,                   "this") \_(ZEND_STR_VALUE,                  "value") \_(ZEND_STR_KEY,                    "key") \_(ZEND_STR_MAGIC_AUTOLOAD,         "__autoload") \_(ZEND_STR_MAGIC_INVOKE,           "__invoke") \_(ZEND_STR_PREVIOUS,               "previous") \_(ZEND_STR_CODE,                   "code") \_(ZEND_STR_MESSAGE,                "message") \_(ZEND_STR_SEVERITY,               "severity") \_(ZEND_STR_STRING,                 "string") \_(ZEND_STR_TRACE,                  "trace") \_(ZEND_STR_SCHEME,                 "scheme") \_(ZEND_STR_HOST,                   "host") \_(ZEND_STR_PORT,                   "port") \_(ZEND_STR_USER,                   "user") \_(ZEND_STR_PASS,                   "pass") \_(ZEND_STR_PATH,                   "path") \_(ZEND_STR_QUERY,                  "query") \_(ZEND_STR_FRAGMENT,               "fragment") \_(ZEND_STR_NULL,                   "NULL") \_(ZEND_STR_BOOLEAN,                "boolean") \_(ZEND_STR_INTEGER,                "integer") \_(ZEND_STR_DOUBLE,                 "double") \_(ZEND_STR_ARRAY,                  "array") \_(ZEND_STR_RESOURCE,               "resource") \_(ZEND_STR_CLOSED_RESOURCE,        "resource (closed)") \_(ZEND_STR_NAME,                   "name") \_(ZEND_STR_ARGV,                   "argv") \_(ZEND_STR_ARGC,                   "argc")static const char *known_strings[] = {
#define _ZEND_STR_DSC(id, str) str,
ZEND_KNOWN_STRINGS(_ZEND_STR_DSC)
#undef _ZEND_STR_DSCNULL
};zend_known_strings = pemalloc(sizeof(zend_string*) * ((sizeof(known_strings) / sizeof(known_strings[0]) - 1)), 1);for (i = 0; i < (sizeof(known_strings) / sizeof(known_strings[0])) - 1; i++) {str = zend_string_init(known_strings[i], strlen(known_strings[i]), 1);zend_known_strings[i] = zend_new_interned_string_permanent(str);}

八、zend_startup_builtin_functions 初始化内置函数

内置函数都定义于Core模块，函数列表如下：

static const zend_function_entry builtin_functions[] = { /* {{{ */ZEND_FE(zend_version,     arginfo_zend__void)ZEND_FE(func_num_args,       arginfo_zend__void)ZEND_FE(func_get_arg,        arginfo_func_get_arg)ZEND_FE(func_get_args,     arginfo_zend__void)ZEND_FE(strlen,          arginfo_strlen)ZEND_FE(strcmp,          arginfo_strcmp)ZEND_FE(strncmp,     arginfo_strncmp)ZEND_FE(strcasecmp,     arginfo_strcmp)ZEND_FE(strncasecmp,     arginfo_strncmp)ZEND_FE(each,           arginfo_each)ZEND_FE(error_reporting,   arginfo_error_reporting)ZEND_FE(define,         arginfo_define)ZEND_FE(defined,     arginfo_defined)ZEND_FE(get_class,      arginfo_get_class)ZEND_FE(get_called_class, arginfo_zend__void)ZEND_FE(get_parent_class,    arginfo_get_class)ZEND_FE(method_exists,        arginfo_method_exists)ZEND_FE(property_exists,  arginfo_property_exists)ZEND_FE(class_exists,       arginfo_class_exists)ZEND_FE(interface_exists,  arginfo_class_exists)ZEND_FE(trait_exists,      arginfo_trait_exists)ZEND_FE(function_exists,   arginfo_function_exists)ZEND_FE(class_alias,        arginfo_class_alias)ZEND_FE(get_included_files, arginfo_zend__void)ZEND_FALIAS(get_required_files,  get_included_files,     arginfo_zend__void)ZEND_FE(is_subclass_of,      arginfo_is_subclass_of)ZEND_FE(is_a,            arginfo_is_subclass_of)ZEND_FE(get_class_vars,      arginfo_get_class_vars)ZEND_FE(get_object_vars, arginfo_get_object_vars)ZEND_FE(get_class_methods,  arginfo_get_class_methods)ZEND_FE(trigger_error,        arginfo_trigger_error)ZEND_FALIAS(user_error,       trigger_error,      arginfo_trigger_error)ZEND_FE(set_error_handler,        arginfo_set_error_handler)ZEND_FE(restore_error_handler,        arginfo_zend__void)ZEND_FE(set_exception_handler,       arginfo_set_exception_handler)ZEND_FE(restore_exception_handler,    arginfo_zend__void)ZEND_FE(get_declared_classes,        arginfo_zend__void)ZEND_FE(get_declared_traits,         arginfo_zend__void)ZEND_FE(get_declared_interfaces,     arginfo_zend__void)ZEND_FE(get_defined_functions,       arginfo_get_defined_functions)ZEND_FE(get_defined_vars,     arginfo_zend__void)ZEND_DEP_FE(create_function,     arginfo_create_function)ZEND_FE(get_resource_type,      arginfo_get_resource_type)ZEND_FE(get_resources,            arginfo_get_resources)ZEND_FE(get_loaded_extensions,        arginfo_get_loaded_extensions)ZEND_FE(extension_loaded,     arginfo_extension_loaded)ZEND_FE(get_extension_funcs,       arginfo_extension_loaded)ZEND_FE(get_defined_constants,     arginfo_get_defined_constants)ZEND_FE(debug_backtrace,      arginfo_debug_backtrace)ZEND_FE(debug_print_backtrace,      arginfo_debug_print_backtrace)ZEND_FE(gc_mem_caches,      arginfo_zend__void)ZEND_FE(gc_collect_cycles,     arginfo_zend__void)ZEND_FE(gc_enabled,      arginfo_zend__void)ZEND_FE(gc_enable,       arginfo_zend__void)ZEND_FE(gc_disable,      arginfo_zend__void)ZEND_FE(gc_status,       arginfo_zend__void)ZEND_FE_END
};

九、zend_register_standard_constants 定义内置的常量

常量都会写入到一个array里，其变量名：executor_globals.zend_constants

常量列表如下：

 REGISTER_MAIN_LONG_CONSTANT("E_ERROR", E_ERROR, CONST_PERSISTENT | CONST_CS);REGISTER_MAIN_LONG_CONSTANT("E_RECOVERABLE_ERROR", E_RECOVERABLE_ERROR, CONST_PERSISTENT | CONST_CS);REGISTER_MAIN_LONG_CONSTANT("E_WARNING", E_WARNING, CONST_PERSISTENT | CONST_CS);REGISTER_MAIN_LONG_CONSTANT("E_PARSE", E_PARSE, CONST_PERSISTENT | CONST_CS);REGISTER_MAIN_LONG_CONSTANT("E_NOTICE", E_NOTICE, CONST_PERSISTENT | CONST_CS);REGISTER_MAIN_LONG_CONSTANT("E_STRICT", E_STRICT, CONST_PERSISTENT | CONST_CS);REGISTER_MAIN_LONG_CONSTANT("E_DEPRECATED", E_DEPRECATED, CONST_PERSISTENT | CONST_CS);REGISTER_MAIN_LONG_CONSTANT("E_CORE_ERROR", E_CORE_ERROR, CONST_PERSISTENT | CONST_CS);REGISTER_MAIN_LONG_CONSTANT("E_CORE_WARNING", E_CORE_WARNING, CONST_PERSISTENT | CONST_CS);REGISTER_MAIN_LONG_CONSTANT("E_COMPILE_ERROR", E_COMPILE_ERROR, CONST_PERSISTENT | CONST_CS);REGISTER_MAIN_LONG_CONSTANT("E_COMPILE_WARNING", E_COMPILE_WARNING, CONST_PERSISTENT | CONST_CS);REGISTER_MAIN_LONG_CONSTANT("E_USER_ERROR", E_USER_ERROR, CONST_PERSISTENT | CONST_CS);REGISTER_MAIN_LONG_CONSTANT("E_USER_WARNING", E_USER_WARNING, CONST_PERSISTENT | CONST_CS);REGISTER_MAIN_LONG_CONSTANT("E_USER_NOTICE", E_USER_NOTICE, CONST_PERSISTENT | CONST_CS);REGISTER_MAIN_LONG_CONSTANT("E_USER_DEPRECATED", E_USER_DEPRECATED, CONST_PERSISTENT | CONST_CS);REGISTER_MAIN_LONG_CONSTANT("E_ALL", E_ALL, CONST_PERSISTENT | CONST_CS);REGISTER_MAIN_LONG_CONSTANT("DEBUG_BACKTRACE_PROVIDE_OBJECT", DEBUG_BACKTRACE_PROVIDE_OBJECT, CONST_PERSISTENT | CONST_CS);REGISTER_MAIN_LONG_CONSTANT("DEBUG_BACKTRACE_IGNORE_ARGS", DEBUG_BACKTRACE_IGNORE_ARGS, CONST_PERSISTENT | CONST_CS);/* true/false constants */{REGISTER_MAIN_BOOL_CONSTANT("TRUE", 1, CONST_PERSISTENT | CONST_CT_SUBST);REGISTER_MAIN_BOOL_CONSTANT("FALSE", 0, CONST_PERSISTENT | CONST_CT_SUBST);REGISTER_MAIN_BOOL_CONSTANT("ZEND_THREAD_SAFE", ZTS_V, CONST_PERSISTENT | CONST_CS);REGISTER_MAIN_BOOL_CONSTANT("ZEND_DEBUG_BUILD", ZEND_DEBUG, CONST_PERSISTENT | CONST_CS);}REGISTER_MAIN_NULL_CONSTANT("NULL", CONST_PERSISTENT | CONST_CT_SUBST);

十、zend_register_auto_global 定义内置全局变量的容器

将"GLOBALS"全局变量容器放入 compiler_globals.auto_globals

int zend_register_auto_global(zend_string *name, zend_bool jit, zend_auto_global_callback auto_global_callback) /* {{{ */
{zend_auto_global auto_global;int retval;auto_global.name = name;auto_global.auto_global_callback = auto_global_callback;auto_global.jit = jit;retval = zend_hash_add_mem(CG(auto_globals), auto_global.name, &auto_global, sizeof(zend_auto_global)) != NULL ? SUCCESS : FAILURE;return retval;
}zend_register_auto_global(zend_string_init_interned("GLOBALS", sizeof("GLOBALS") - 1, 1), 1, php_auto_globals_create_globals);

十一、zend_ini_startup 初始化ini结构

ZEND_API int zend_ini_startup(void)
{registered_zend_ini_directives = (HashTable *) malloc(sizeof(HashTable));EG(ini_directives) = registered_zend_ini_directives;EG(modified_ini_directives) = NULL;EG(error_reporting_ini_entry) = NULL;zend_hash_init_ex(registered_zend_ini_directives, 128, NULL, free_ini_entry, 1, 0);return SUCCESS;
}

至此，zend_startup 已经执行完毕。

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