Zend opcode 相关数据结构定义在/php-src/Zend/zend_compile.h中
Zend opcode基本结构是zend_op,定义如下
typedef struct _zend_op zend_op;
......
struct _zend_op {
opcode_handler_t handler;
znode_op op1;
znode_op op2;
znode_op result;
zend_ulong extended_value;
uint lineno;
zend_uchar opcode;
zend_uchar op1_type;
zend_uchar op2_type;
zend_uchar result_type;
};
在引擎内部的通常使用opline这个全局变量来访问,opcode使用/php-src/Zend/zend_compile.c中的zend_emit_op函数创建
znode_op定义如下:
typedef union _znode_op {
uint32_t constant;
uint32_t var;
uint32_t num;
uint32_t opline_num; /* Needs to be signed */
zend_op *jmp_addr;
zval *zv;
} znode_op;
函数内部的opcode的结构为zend_op_array,定义如下:
typedef struct _zend_op_array zend_op_array;
......
struct _zend_op_array {
/* Common elements */
zend_uchar type;
uint32_t fn_flags;
zend_string *function_name;
zend_class_entry *scope;
zend_function *prototype;
uint32_t num_args;
uint32_t required_num_args;
zend_arg_info *arg_info;
/* END of common elements */
uint32_t *refcount;
uint32_t this_var;
uint32_t last;
zend_op *opcodes;
int last_var;
uint32_t T;
zend_string **vars;
int last_brk_cont;
int last_try_catch;
zend_brk_cont_element *brk_cont_array;
zend_try_catch_element *try_catch_array;
/* static variables support */
HashTable *static_variables;
zend_string *filename;
uint32_t line_start;
uint32_t line_end;
zend_string *doc_comment;
uint32_t early_binding; /* the linked list of delayed declarations */
int last_literal;
zval *literals;
int last_cache_slot;
void **run_time_cache;
void *reserved[ZEND_MAX_RESERVED_RESOURCES];
};
zval 作为 php zend常用的数据结构，它定义在/php-src/Zend/zend_types.h中
typedef struct _zval_struct zval;
.......
struct _zval_struct {
zend_value value; /* value */
union {
struct {
ZEND_ENDIAN_LOHI_4(
zend_uchar type, /* active type */
zend_uchar type_flags,
zend_uchar const_flags,
zend_uchar reserved) /* various IS_VAR flags */
} v;
uint32_t type_info;
} u1;
union {
uint32_t var_flags;
uint32_t next; /* hash collision chain */
uint32_t cache_slot; /* literal cache slot */
uint32_t lineno; /* line number (for ast nodes) */
} u2;
};
zend_value定义如下,位于文件/php-src/Zend/zend_types.h中：
typedef union _zend_value {
zend_long lval; /* long value */
double dval; /* double value */
zend_refcounted *counted;
zend_string *str;
zend_array *arr;
zend_object *obj;
zend_resource *res;
zend_reference *ref;
zend_ast_ref *ast;
zval *zv;
void *ptr;
zend_class_entry *ce;
zend_function *func;
} zend_value;
zend_execute_data作为引擎存储的执行数据，该结构定义在/php-src/Zend/zend_types.h中:
typedef struct _zend_execute_data zend_execute_data;
而_zend_execute_data定义在/php-src/Zend/zend_compile.h中，结构如下:
struct _zend_execute_data {
const zend_op *opline; /* executed opline */
zend_execute_data *call; /* current call */
void **run_time_cache;
zend_function *func; /* executed op_array */
zval This;
zend_class_entry *called_scope;
zend_execute_data *prev_execute_data;
uint32_t frame_info;
uint32_t num_args;
zval *return_value;
zend_class_entry *scope; /* function scope (self) */
zend_array *symbol_table;
const zend_op *fast_ret; /* used by FAST_CALL/FAST_RET (finally keyword) */
zend_object *delayed_exception;
uint32_t silence_op_num;
uint32_t old_error_reporting;
};