objective-c – 在EXC_BAD_ACCESS中代码= 1和代码= 2之间有什么区别？
栏目: Objective-C · 发布时间: 7年前
内容简介：我正在为EXC_BAD_ACCESS错误接收代码= 1或代码= 2.我想知道代码= 1和代码= 2之间有什么区别？http://stackoverflow.com/questions/19741409/whats-the-difference-between-code-1-and-code-2-in-exc-bad-access
我正在为EXC_BAD_ACCESS错误接收代码= 1或代码= 2.我想知道代码= 1和代码= 2之间有什么区别？
代码= 1是KERN_INVALID_ADDRESS,代码= 2是KERN_PROTECTION_FAILURE.两者都是
在 “Technical Note TN2123 CrashReporter”年解释：
The most common forms of exception are:
-
EXC_BAD_ACCESS/KERN_INVALID_ADDRESS — This is caused by the thread
accessing unmapped memory. It may be triggered by either a data access
or an instruction fetch; the Thread State section describes how to
tell the difference. -
EXC_BAD_ACCESS/KERN_PROTECTION_FAILURE — This is
caused by the thread trying to write to read-only memory. This is
always caused by a data access.
代码定义在
<mach/kern_return.h>
：
#define KERN_INVALID_ADDRESS 1
/* Specified address is not currently valid.
*/
#define KERN_PROTECTION_FAILURE 2
/* Specified memory is valid, but does not permit the
* required forms of access.
*/
并在
<mach/exception_types.h>
中记录了代码
对于EXC_BAD_ACCESS是一个kern_return_t：
#define EXC_BAD_ACCESS 1 /* Could not access memory */
/* Code contains kern_return_t describing error. */
/* Subcode contains bad memory address. */
http://stackoverflow.com/questions/19741409/whats-the-difference-between-code-1-and-code-2-in-exc-bad-access
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