19.opcode处理函数查找

来源：互联网发布：linux 更改机器名称编辑：程序博客网时间：2024/06/05 18:08

这里写图片描述

ZEND_API void execute(zend_op_array *op_array TSRMLS_DC){...zend_vm_enter:....if ((ret = EX(opline)->handler(execute_data TSRMLS_CC)) > 0) {            switch (ret) {                case 1:                    EG(in_execution) = original_in_execution;                    return;                case 2:                    op_array = EG(active_op_array);                    goto zend_vm_enter;                case 3:                    execute_data = EG(current_execute_data);                default:                    break;            }｝...}

这里写图片描述

static opcode_handler_tzend_vm_get_opcode_handler(zend_uchar opcode, zend_op* op){        static const int zend_vm_decode[] = {            _UNUSED_CODE, /* 0              */            _CONST_CODE,  /* 1 = IS_CONST   */            _TMP_CODE,    /* 2 = IS_TMP_VAR */            _UNUSED_CODE, /* 3              */            _VAR_CODE,    /* 4 = IS_VAR     */            _UNUSED_CODE, /* 5              */            _UNUSED_CODE, /* 6              */            _UNUSED_CODE, /* 7              */            _UNUSED_CODE, /* 8 = IS_UNUSED  */            _UNUSED_CODE, /* 9              */            _UNUSED_CODE, /* 10             */            _UNUSED_CODE, /* 11             */            _UNUSED_CODE, /* 12             */            _UNUSED_CODE, /* 13             */            _UNUSED_CODE, /* 14             */            _UNUSED_CODE, /* 15             */            _CV_CODE      /* 16 = IS_CV     */        };          return zend_opcode_handlers[             opcode * 25 + zend_vm_decode[op->op1.op_type] * 5                     + zend_vm_decode[op->op2.op_type]];}

这里写图片描述

//函数调用：DO_FCALL  ==>  ZEND_DO_FCALL_SPEC_CONST_HANDLER//变量赋值：ASSIGN     =>      ZEND_ASSIGN_SPEC_VAR_CONST_HANDLER                   ZEND_ASSIGN_SPEC_VAR_TMP_HANDLER                   ZEND_ASSIGN_SPEC_VAR_VAR_HANDLER                   ZEND_ASSIGN_SPEC_VAR_CV_HANDLER            //变量加法：ASSIGN_SUB =>   ZEND_ASSIGN_SUB_SPEC_VAR_CONST_HANDLER,                    ZEND_ASSIGN_SUB_SPEC_VAR_TMP_HANDLER,                    ZEND_ASSIGN_SUB_SPEC_VAR_VAR_HANDLER,                    ZEND_ASSIGN_SUB_SPEC_VAR_UNUSED_HANDLER,                    ZEND_ASSIGN_SUB_SPEC_VAR_CV_HANDLER,                    ZEND_ASSIGN_SUB_SPEC_UNUSED_CONST_HANDLER,                    ZEND_ASSIGN_SUB_SPEC_UNUSED_TMP_HANDLER,                    ZEND_ASSIGN_SUB_SPEC_UNUSED_VAR_HANDLER,                    ZEND_ASSIGN_SUB_SPEC_UNUSED_UNUSED_HANDLER,                    ZEND_ASSIGN_SUB_SPEC_UNUSED_CV_HANDLER,                    ZEND_ASSIGN_SUB_SPEC_CV_CONST_HANDLER,                    ZEND_ASSIGN_SUB_SPEC_CV_TMP_HANDLER,                    ZEND_ASSIGN_SUB_SPEC_CV_VAR_HANDLER,                    ZEND_ASSIGN_SUB_SPEC_CV_UNUSED_HANDLER,                    ZEND_ASSIGN_SUB_SPEC_CV_CV_HANDLER,

这里写图片描述

static opcode_handler_tzend_vm_get_opcode_handler(zend_uchar opcode, zend_op* op){        static const int zend_vm_decode[] = {            _UNUSED_CODE, /* 0              */            _CONST_CODE,  /* 1 = IS_CONST   */            _TMP_CODE,    /* 2 = IS_TMP_VAR */            _UNUSED_CODE, /* 3              */            _VAR_CODE,    /* 4 = IS_VAR     */            _UNUSED_CODE, /* 5              */            _UNUSED_CODE, /* 6              */            _UNUSED_CODE, /* 7              */            _UNUSED_CODE, /* 8 = IS_UNUSED  */            _UNUSED_CODE, /* 9              */            _UNUSED_CODE, /* 10             */            _UNUSED_CODE, /* 11             */            _UNUSED_CODE, /* 12             */            _UNUSED_CODE, /* 13             */            _UNUSED_CODE, /* 14             */            _UNUSED_CODE, /* 15             */            _CV_CODE      /* 16 = IS_CV     */        };       //很显然，我们把opcode和相对应的写到了/tmp/php.log文件中     int op_index;     op_index = opcode * 25 + zend_vm_decode[op->op1.op_type] * 5 + zend_vm_decode[op->op2.op_type];     FILE *stream;     if((stream = fopen("/tmp/php.log", "a+")) != NULL){         fprintf(stream, "opcode: %d , zend_opcode_handlers_index:%d\n", opcode, op_index);     }         fclose(stream);        return zend_opcode_handlers[             opcode * 25 + zend_vm_decode[op->op1.op_type] * 5                     + zend_vm_decode[op->op2.op_type]];}

这里写图片描述

http://www.php-internals.com/book/?p=chapt02/02-03-03-from-opcode-to-handler

0 0