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php語言

php內核分析之全局變量

時間:2024-09-03 18:33:29 php語言 我要投稿
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php內核分析之全局變量

  同學們,一定要努力學習哦,因為知識是不會辜負你的。以下是百分網小編精心為大家整理的php內核分析之全局變量,希望對大家學習PHP的同學有所幫助!更多內容請關注應屆畢業(yè)生網!

  這里閱讀的php版本為PHP-7.1.0 RC3,閱讀代碼的平臺為linux

  CG

  CG是從全局的compiler_global中獲取屬性值,里面存儲的就是編譯過程使用到的'全局變量。

  struct _zend_compiler_globals {

  zend_stack loop_var_stack;

  zend_class_entry *active_class_entry;

  zend_string *compiled_filename;

  int zend_lineno;

  zend_op_array *active_op_array;

  HashTable *function_table; /* function symbol table */

  HashTable *class_table; /* class table */

  HashTable filenames_table;

  HashTable *auto_globals;

  zend_bool parse_error;

  zend_bool in_compilation;

  zend_bool short_tags;

  zend_bool unclean_shutdown;

  zend_bool ini_parser_unbuffered_errors;

  zend_llist open_files;

  struct _zend_ini_parser_param *ini_parser_param;

  uint32_t start_lineno; // 執(zhí)行文件開始執(zhí)行的行號

  zend_bool increment_lineno;

  zend_string *doc_comment;

  uint32_t extra_fn_flags;

  uint32_t compiler_options; /* set of ZEND_COMPILE_* constants */

  HashTable const_filenames;

  zend_oparray_context context;

  zend_file_context file_context;

  zend_arena *arena;

  zend_string *empty_string;

  zend_string *one_char_string[256];

  zend_string **known_strings;

  uint32_t known_strings_count;

  HashTable interned_strings;

  const zend_encoding **script_encoding_list;

  size_t script_encoding_list_size;

  zend_bool multibyte;

  zend_bool detect_unicode;

  zend_bool encoding_declared;

  zend_ast *ast;

  zend_arena *ast_arena;

  zend_stack delayed_oplines_stack;

  #ifdef ZTS

  zval **static_members_table;

  int last_static_member;

  #endif

  };

  SG

  SG是從全局的sapi_global中獲取屬性值

  // TODO:更新

  typedef struct _sapi_globals_struct {

  void *server_context;

  sapi_request_info request_info; // 請求信息

  sapi_headers_struct sapi_headers;

  int64_t read_post_bytes;

  unsigned char post_read;

  unsigned char headers_sent;

  zend_stat_t global_stat;

  char *default_mimetype;

  char *default_charset;

  HashTable *rfc1867_uploaded_files;

  zend_long post_max_size;

  int options;

  zend_bool sapi_started;

  double global_request_time;

  HashTable known_post_content_types;

  zval callback_func;

  zend_fcall_info_cache fci_cache;

  } sapi_globals_struct;

  EG

  EG是從executor_globals中獲取變量

  // TODO: 更新

  struct _zend_executor_globals {

  zval uninitialized_zval;

  zval error_zval;

  /* symbol table cache */

  zend_array *symtable_cache[SYMTABLE_CACHE_SIZE];

  zend_array **symtable_cache_limit;

  zend_array **symtable_cache_ptr;

  zend_array symbol_table; /* main symbol table */

  HashTable included_files; /* files already included */

  JMP_BUF *bailout;

  int error_reporting;

  int exit_status;

  HashTable *function_table; /* function symbol table */

  HashTable *class_table; /* class table */

  HashTable *zend_constants; /* constants table */

  zval *vm_stack_top;

  zval *vm_stack_end;

  zend_vm_stack vm_stack;

  struct _zend_execute_data *current_execute_data;

  zend_class_entry *fake_scope; /* used to avoid checks accessing properties */

  zend_long precision;

  int ticks_count;

  HashTable *in_autoload;

  zend_function *autoload_func;

  zend_bool full_tables_cleanup;

  /* for extended information support */

  zend_bool no_extensions;

  zend_bool vm_interrupt;

  zend_bool timed_out;

  zend_long hard_timeout;

  #ifdef ZEND_WIN32

  OSVERSIONINFOEX windows_version_info;

  #endif

  HashTable regular_list;

  HashTable persistent_list;

  int user_error_handler_error_reporting;

  zval user_error_handler;

  zval user_exception_handler;

  zend_stack user_error_handlers_error_reporting;

  zend_stack user_error_handlers;

  zend_stack user_exception_handlers;

  zend_error_handling_t error_handling;

  zend_class_entry *exception_class;

  /* timeout support */

  zend_long timeout_seconds;

  int lambda_count;

  HashTable *ini_directives;

  HashTable *modified_ini_directives;

  zend_ini_entry *error_reporting_ini_entry;

  zend_objects_store objects_store;

  zend_object *exception, *prev_exception;

  const zend_op *opline_before_exception;

  zend_op exception_op[3];

  struct _zend_module_entry *current_module;

  zend_bool active;

  zend_bool valid_symbol_table;

  zend_long assertions;

  uint32_t ht_iterators_count; /* number of allocatd slots */

  uint32_t ht_iterators_used; /* number of used slots */

  HashTableIterator *ht_iterators;

  HashTableIterator ht_iterators_slots[16];

  void *saved_fpu_cw_ptr;

  #if XPFPA_HAVE_CW

  XPFPA_CW_DATATYPE saved_fpu_cw;

  #endif

  zend_function trampoline;

  zend_op call_trampoline_op;

  void *reserved[ZEND_MAX_RESERVED_RESOURCES];

  };

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