Thanks for the reminder again, the reason I couldn't run lldb's before was
because the version of python I installed didn't match, now it works fine! I
get the following error using the lldb debugger:
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(lldb) Process 2444 launched: 'C:\demo/test.exe' (x86_64)
Process 2444 stopped
* thread #1, stop reason = Exception 0xc0000005 encountered at address
0x7ff88ae8d14a: Access violation reading location 0x000001a0
frame #0: 0x00007ff88ae8d14a objc.dll`objc_msgSend + 70
objc.dll`objc_msgSend:
-> 0x7ff88ae8d14a <+70>: movq 0x8(%r10,%rbx,8), %r10
0x7ff88ae8d14f <+75>: movzbl %al, %ebx
0x7ff88ae8d152 <+78>: movq -0x8(%rsp), %rax
0x7ff88ae8d157 <+83>: movq 0x8(%r10,%rbx,8), %r10
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Based on the debugging information I've determined that it's because of a
pointer error, but I've checked that my code doesn't use pointers incorrectly,
and the debugging information mentions objc_xxx, which suggests that it's an
error in the objc itself possiblely. After testing the objc_ related runtime
function really does not work properly, the test code and test results are as
follows:
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@interface LayoutManager : NSObject
- (void)display;
@end
@implementation LayoutManager
- (void)display {
printf("LayoutManager::display\n");
}
@end
void test() {
}
int main() {
// LayoutManager *relative = [[LayoutManager alloc]init];
// [relative display];
id aClassFromName = objc_getClass("LayoutManager");
NSLog(@"aClass = %@", aClassFromName); //! null
id aClassFromClass = [NSArray class]; //! error
NSLog(@"aClass = %@", aClassFromClass); // Never go through here.
return 0;
}
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China Guy.
