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php核心分析（三）－全域變數

黄舟

Dec 19, 2016 am 11:08 AM

摘要：這裡閱讀的php版本為PHP-7.1.0 RC3，閱讀程式碼的平台為linuxCGCG是從全域的compiler_global取得屬性值，裡面儲存的就是編譯過程使用到的全域變數。 struct _zend_compiler_globals { zend_stack loop_var_stack; zen ...

這裡閱讀的php版本為PHP-7.1.0 RC3，閱讀程式碼的平台為linux

CG是從全域的儲存值，global就是編譯過程使用到的全域變數。

01    struct _zend_compiler_globals {    
02        zend_stack loop_var_stack;    
03    
04        zend_class_entry *active_class_entry;    
05    
06        zend_string *compiled_filename;    
07    
08        int zend_lineno;    
09    
10        zend_op_array *active_op_array;    
11    
12        HashTable *function_table;    /* function symbol table */    
13        HashTable *class_table;        /* class table */    
14    
15        HashTable filenames_table;    
16    
17        HashTable *auto_globals;    
18    
19        zend_bool parse_error;    
20        zend_bool in_compilation;    
21        zend_bool short_tags;    
22    
23        zend_bool unclean_shutdown;    
24    
25        zend_bool ini_parser_unbuffered_errors;    
26    
27        zend_llist open_files;    
28    
29        struct _zend_ini_parser_param *ini_parser_param;    
30    
31        uint32_t start_lineno; // 执行文件开始执行的行号    
32        zend_bool increment_lineno;    
33    
34        zend_string *doc_comment;    
35        uint32_t extra_fn_flags;    
36    
37        uint32_t compiler_options; /* set of ZEND_COMPILE_* constants */    
38    
39        HashTable const_filenames;    
40    
41        zend_oparray_context context;    
42        zend_file_context file_context;    
43    
44        zend_arena *arena;    
45    
46        zend_string *empty_string;    
47        zend_string *one_char_string[256];    
48        zend_string **known_strings;    
49        uint32_t    known_strings_count;    
50    
51        HashTable interned_strings;    
52    
53        const zend_encoding **script_encoding_list;    
54        size_t script_encoding_list_size;    
55        zend_bool multibyte;    
56        zend_bool detect_unicode;    
57        zend_bool encoding_declared;    
58    
59        zend_ast *ast;    
60        zend_arena *ast_arena;    
61    
62        zend_stack delayed_oplines_stack;    
63    
64    #ifdef ZTS    
65        zval **static_members_table;    
66        int last_static_member;    
67    #endif    
68    };

01    SG是从全局的sapi_global中获取属性值    
02    
03    // TODO：更新    
04    typedef struct _sapi_globals_struct {    
05        void *server_context;    
06        sapi_request_info request_info; // 请求信息    
07        sapi_headers_struct sapi_headers;    
08        int64_t read_post_bytes;    
09        unsigned char post_read;    
10        unsigned char headers_sent;    
11        zend_stat_t global_stat;    
12        char *default_mimetype;    
13        char *default_charset;    
14        HashTable *rfc1867_uploaded_files;    
15        zend_long post_max_size;    
16        int options;    
17        zend_bool sapi_started;    
18        double global_request_time;    
19        HashTable known_post_content_types;    
20        zval callback_func;    
21        zend_fcall_info_cache fci_cache;    
22    } sapi_globals_struct;

EG是從executor_globals中取得變數

01    // TODO: 更新    
02    struct _zend_executor_globals {    
03        zval uninitialized_zval;    
04        zval error_zval;    
05    
06        /* symbol table cache */    
07        zend_array *symtable_cache[SYMTABLE_CACHE_SIZE];    
08        zend_array **symtable_cache_limit;    
09        zend_array **symtable_cache_ptr;    
10    
11        zend_array symbol_table;        /* main symbol table */    
12    
13        HashTable included_files;    /* files already included */    
14    
15        JMP_BUF *bailout;    
16    
17        int error_reporting;    
18        int exit_status;    
19    
20        HashTable *function_table;    /* function symbol table */    
21        HashTable *class_table;        /* class table */    
22        HashTable *zend_constants;    /* constants table */    
23    
24        zval          *vm_stack_top;    
25        zval          *vm_stack_end;    
26        zend_vm_stack  vm_stack;    
27    
28        struct _zend_execute_data *current_execute_data;    
29        zend_class_entry *fake_scope; /* used to avoid checks accessing properties */    
30    
31        zend_long precision;    
32    
33        int ticks_count;    
34    
35        HashTable *in_autoload;    
36        zend_function *autoload_func;    
37        zend_bool full_tables_cleanup;    
38    
39        /* for extended information support */    
40        zend_bool no_extensions;    
41    
42        zend_bool vm_interrupt;    
43        zend_bool timed_out;    
44        zend_long hard_timeout;    
45    
46    #ifdef ZEND_WIN32    
47        OSVERSIONINFOEX windows_version_info;    
48    #endif    
49    
50        HashTable regular_list;    
51        HashTable persistent_list;    
52    
53        int user_error_handler_error_reporting;    
54        zval user_error_handler;    
55        zval user_exception_handler;    
56        zend_stack user_error_handlers_error_reporting;    
57        zend_stack user_error_handlers;    
58        zend_stack user_exception_handlers;    
59    
60        zend_error_handling_t  error_handling;    
61        zend_class_entry      *exception_class;    
62    
63        /* timeout support */    
64        zend_long timeout_seconds;    
65    
66        int lambda_count;    
67    
68        HashTable *ini_directives;    
69        HashTable *modified_ini_directives;    
70        zend_ini_entry *error_reporting_ini_entry;    
71    
72        zend_objects_store objects_store;    
73        zend_object *exception, *prev_exception;    
74        const zend_op *opline_before_exception;    
75        zend_op exception_op[3];    
76    
77        struct _zend_module_entry *current_module;    
78    
79        zend_bool active;    
80        zend_bool valid_symbol_table;    
81    
82        zend_long assertions;    
83    
84        uint32_t           ht_iterators_count;     /* number of allocatd slots */    
85        uint32_t           ht_iterators_used;      /* number of used slots */    
86        HashTableIterator *ht_iterators;    
87        HashTableIterator  ht_iterators_slots[16];    
88    
89        void *saved_fpu_cw_ptr;    
90    #if XPFPA_HAVE_CW    
91        XPFPA_CW_DATATYPE saved_fpu_cw;    
92    #endif    
93    
94        zend_function trampoline;    
95        zend_op       call_trampoline_op;    
96    
97        void *reserved[ZEND_MAX_RESERVED_RESOURCES];    
98    };

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