如何使用PHP Embed SAPI实现Opcodes查看器

这篇文章主要介绍了如何使用PHP Embed SAPI实现Opcodes查看器的相关资料,需要的朋友可以参考下

首先，下载PHP源码以供编译， 我现在使用的是PHP5.3 alpha2

进入源码目录：

./configure --enable-embed --with-config-file-scan-dir=/etc/php.d --with-mysql  --with-config-file-path=/etc/
 ./make
 ./make install

最后，记得要将生成的libphp5.so复制到运行时库的目录，我直接拷贝到了/lib/, 否则会在运行你自己的embed程序的时候报错：

./embed: error while loading shared libraries: libphp5.so: cannot open shared object file: No such file or directory

如果你对PHP的SAPI还不熟悉的话，我建议你看看我的这篇文章：深入理解Zend SAPIs(Zend SAPI Internals)
这个时候，你就可以在你的C代码中，嵌入PHP脚本解析器了， 我的例子：

#include "sapi/embed/php_embed.h" int main(int argc, char * argv[]){ PHP_EMBED_START_BLOCK(argc,argv); char * script = " print 'Hello World!';"; zend_eval_string(script, NULL, "Simple Hello World App" TSRMLS_CC); PHP_EMBED_END_BLOCK(); return 0; }

然后就是要指明include path了，一个简单的Makefile

CC = gcc CFLAGS = -I/usr/local/include/php/ \ -I/usr/local/include/php/main \ -I/usr/local/include/php/Zend \ -I/usr/local/include/php/TSRM \ -Wall -g LDFLAGS = -lstdc++ -L/usr/local/lib -lphp5 ALL: $(CC) -o embed embed.cpp $(CFLAGS) $(LDFLAGS)

编译成功以后， 运行，我们可以看到， stdout输出 Hello World！

基于这个，我们就可以很容易的实现一个类似于vld的Opcodes dumper：
首先我们定义opcode的转换函数（全部的opcodes可以查看Zend/zend_vm_opcodes.h）；

char *opname(zend_uchar opcode){ switch(opcode) { case ZEND_NOP: return "ZEND_NOP"; break; case ZEND_ADD: return "ZEND_ADD"; break; case ZEND_SUB: return "ZEND_SUB"; break; case ZEND_MUL: return "ZEND_MUL"; break; case ZEND_DIV: return "ZEND_DIV"; break; case ZEND_MOD: return "ZEND_MOD"; break; case ZEND_SL: return "ZEND_SL"; break; case ZEND_SR: return "ZEND_SR"; break; case ZEND_CONCAT: return "ZEND_CONCAT"; break; case ZEND_BW_OR: return "ZEND_BW_OR"; break; case ZEND_BW_AND: return "ZEND_BW_AND"; break; case ZEND_BW_XOR: return "ZEND_BW_XOR"; break; case ZEND_BW_NOT: return "ZEND_BW_NOT"; break; /*...省略 ....*/ default : return "UNKNOW"; break;

然后定义zval和znode的输出函数：

char *format_zval(zval *z) { static char buffer[BUFFER_LEN]; int len; switch(z->type) { case IS_NULL: return "NULL"; case IS_LONG: case IS_BOOL: snprintf(buffer, BUFFER_LEN, "%d", z->value.lval); return buffer; case IS_DOUBLE: snprintf(buffer, BUFFER_LEN, "%f", z->value.dval); return buffer; case IS_STRING: snprintf(buffer, BUFFER_LEN, "\"%s\"", z->value.str.val); return buffer; case IS_ARRAY: case IS_OBJECT: case IS_RESOURCE: case IS_CONSTANT: case IS_CONSTANT_ARRAY: return ""; default: return "unknown"; } } char * format_znode(znode *n){ static char buffer[BUFFER_LEN]; switch (n->op_type) { case IS_CONST: return format_zval(&n->u.constant); break; case IS_VAR: snprintf(buffer, BUFFER_LEN, "$%d", n->u.var/sizeof(temp_variable)); return buffer; break; case IS_TMP_VAR: snprintf(buffer, BUFFER_LEN, "~%d", n->u.var/sizeof(temp_variable)); return buffer; break; default: return ""; break; } }

然后定义op_array的输出函数：

void dump_op(zend_op *op, int num){ printf("%5d %5d %30s %040s %040s %040s\n", num, op->lineno, opname(op->opcode), format_znode(&op->op1), format_znode(&op->op2), format_znode(&op->result)) ; } void dump_op_array(zend_op_array *op_array){ if(op_array) { int i; printf("%5s %5s %30s %040s %040s %040s\n", "opnum", "line", "opcode", "op1", "op2", "result"); for(i = 0; i last; i++) { dump_op(&op_array->opcodes[i], i); } } }

最后，就是程序的主函数了：

int main(int argc, char **argv){ zend_op_array *op_array; zend_file_handle file_handle; if(argc != 2) { printf("usage: op_dumper <script>\n"); return 1; } PHP_EMBED_START_BLOCK(argc,argv); printf("Script: %s\n", argv[1]); file_handle.filename = argv[1]; file_handle.free_filename = 0; file_handle.type = ZEND_HANDLE_FILENAME; file_handle.opened_path = NULL; op_array = zend_compile_file(&file_handle, ZEND_INCLUDE TSRMLS_CC); if(!op_array) { printf("Error parsing script: %s\n", file_handle.filename); return 1; } dump_op_array(op_array); PHP_EMBED_END_BLOCK(); return 0; } </script>

编译，运行测试脚本(sample.php):

复制代码 代码如下:

sample.php:
   echo "laruence";

命令：

复制代码 代码如下:

./opcodes_dumper  sample.php

得到输出结果(如果你对下面的结果很迷惑，那么建议你再看看我的这篇文章：深入理解PHP原理之Opcodes）：

Script: sample.php

opnum   line                         opcode                                      op1                                      op2                                   result
    0      2                      ZEND_ECHO                               "laruence"
    1      4                    ZEND_RETURN                                        1

呵呵，怎么样，是不是很好玩呢？