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: 6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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