zend_config
./configure –with-php-config=/usr/local/bin/php-config ./configure –enable-debug
checking for bison version… ./configure: line 5574: -z: command not found
2.3
configure: error: bison 3.0.0 or later is required to generate PHP parsers (excluded versions: none).
localhost:php-src didi$ git branch
brew install bison
checking for bison version… ./configure: line 5574: -z: command not found
3.6.2 (ok)
checking for re2c… no
configure: error: re2c 0.13.4 is required to generate PHP lexers.
brew install re2c
生成了Zend/zend_config.h
/Users/didi/PhpstormProjects/c/php-src/Zend/zend_config.w32.h:23:10: fatal error: ‘../main/config.w32.h’ file not found
#include <../main/config.w32.h>
In file included from /usr/include/php/main/php.h:35:
/usr/include/php/Zend/zend.h:51:11: fatal error: ‘zend_config.h’ file not found
include
^
1 error generated.
make: *** [redis.lo] Error 1
两个问题都解决了
cd ext/alae/cmake-build-debug/
make
/Users/didi/PhpstormProjects/c/php-src/Zend/zend_virtual_cwd.h:22:10: fatal error: ‘TSRM.h’ file not found
#include “TSRM.h”
https://l1905.github.io/php/2020/02/28/macos-pecl-xdebug-mongodb/
CMakefileList.txt加上
include_directories(${PHP_SOURCE}/TSRM)
问题解决
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make[2]: ** [alae] Error 1
make[1]: ** [CMakeFiles/alae.dir/all] Error 2
make: *** [all] Error 2
https://blog.51cto.com/peterxu/1795036
SET(CMAKE_C_COMPILER g++)
SET(CMAKE_MODULE_LINKER_FLAGS “-lstdc++.8”)
SET(CMAKE_SHARED_LINKER_FLAGS “-lstdc++.8”)
SET(CMAKE_EXE_LINKER_FLAGS “-lstdc++.8”)
SET(CMAKE_STATIC_LINKER_FLAGS “-lstdc++.8”)
https://blog.csdn.net/esrrhs/article/details/52700332
https://blog.csdn.net/m0_38130105/article/details/84234774
32 warnings and 5 errors generated.
make[2]: ** [CMakeFiles/alae.dir/alae.c.o] Error 1
make[1]: ** [CMakeFiles/alae.dir/all] Error 2
make: *** [all] Error 2
/Users/didi/PhpstormProjects/c/php-src/ext/alae/alae.c:624:21: error: use of undeclared identifier ‘EX_CONSTANT’
7.2不再支持7.1的这个宏
/* constant in currently executed function */
#define EX_CONSTANT(node)
RT_CONSTANT_EX(EX_LITERALS(), node)
/* run-time constant */
define RT_CONSTANT_EX(base, node) \
((zval*)(((char*)(base)) + (node).constant))
define EX_LITERALS() \
EX(literals)
error: no member named ‘literals’ in ‘_zend_execute_data’
dim = EX_CONSTANT(opline->op2);
1、zend_execute_data:opcode执行期间非常重要的一个结构，记录着当前执行的zend_op、返回值、所属函数/对象指针、符号表等
struct _zend_execute_data {
const zend_op opline; / executed opline 指向第一条opcode /
zend_execute_data *call; / current call /
zval *return_value;
zend_function *func; / executed op_array */
zval This;
#if ZEND_EX_USE_RUN_TIME_CACHE
void **run_time_cache;
#endif
#if ZEND_EX_USE_LITERALS
zval *literals;
#endif
zend_class_entry *called_scope;
zend_execute_data *prev_execute_data;
zend_array *symbol_table;
};
2、zend_op:zend指令
//zend.compile.h
struct _zend_op {
const void *handler; //该指令调用的处理函数
znode_op op1; //操作数1
znode_op op2; //操作数2
znode_op result;
uint32_t extended_value;
uint32_t lineno;
zend_uchar opcode; //opcode指令编号
zend_uchar op1_type; //操作数1类型
zend_uchar op2_type;
zend_uchar result_type;
};
7.1有这个结构7.2没有了
define EX_LITERALS()
error: cannot initialize a parameter of type ‘zend_object *’
(aka ‘_zend_object *’) with an lvalue of type ‘zval *’ (aka ‘_zval_struct *’)
https://segmentfault.com/a/1190000004340427
https://wiki.jikexueyuan.com/project/extending-embedding-php/2.html
在PHP源码中，我们可以见到诸如PHPAPI ZEND_API TSRM_API等xxx_API(当然还有其他格式的)这样的宏
关于它们的定义都是类似于
#if defined(GNUC) && GNUC >= 4
define ZEND_API attribute ((visibility(“default”)))
#else
define ZEND_API
#endif
一、预定义__GNUC__宏
1 __GNUC__ 是gcc编译器编译代码时预定义的一个宏。需要针对gcc编写代码时， 可以使用该宏进行条件编译。
2 __GNUC__ 的值表示gcc的版本。需要针对gcc特定版本编写代码时，也可以使用该宏进行条件编译。
3 __GNUC__ 的类型是“int”，该宏被扩展后， 得到的是整数字面值。可以通过仅预处理，查看宏扩展后的文本。
所以我们知道ZEND_API定义为：
如果编译器使用的是gcc且GNUC的版本大于等于4,则定义ZEND_API为 attribute ((visibility(“default”)))
那__attribute__到底是干嘛的，有什么作用呢？
查阅关于C的相关资料得出结论:
attribute ((visibility(“default”)))定义的函数都是可见的
GCC 有个visibility属性, 该属性是说, 启用这个属性:
- 当-fvisibility=hidden时
动态库中的函数默认是被隐藏的即 hidden. 除非显示声明为__attribute__((visibility(“default”))).
- 当-fvisibility=default时
动态库中的函数默认是可见的.除非显示声明为__attribute__((visibility(“hidden”))).
$ /Library/Developer/CommandLineTools/usr/bin/ld -v
@(#)PROGRAM:ld PROJECT:ld64-274.2
configured to support archs: armv6 armv7 armv7s arm64 i386 x86_64 x86_64h armv6m armv7k armv7m armv7em (tvOS)
LTO support using: LLVM version 8.0.0, (clang-800.0.42.1)
TAPI support using: Apple TAPI version 1.30
