php內(nèi)核分析之全局變量
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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; /pic/p>
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
/pic/p>
typedef struct _sapi_globals_struct {
void *server_context;
sapi_request_info request_info; /pic/p>
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
/pic/p>
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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