lldb

How to print out a property's contents using Xcode debugger?

由 感情迁移 提交于 2019-11-27 03:24:17
问题 I'm writing an iOS app and I need help using the built-in Xcode debugger. Suppose I have an object called HomeViewController that has three properties @property (nonatomic) BOOL finished; @property (nonatomic, strong) NSArray *myArray; @property (nonatomic, strong) NSString *myName; @synthesize finished = _finished, myArray = _myArray, myName = _myName; Suppose I have a breakpoint in this class. How would I view the contents of these properties? I've tried things such as po myName , print

Why can't LLDB evaluate this expression?

由 岁酱吖の 提交于 2019-11-27 03:22:38
问题 Neither one of these statements can be processed by LLDB... why is it unable to come up with the NSString result and print it out expr -o -- [NSString stringWithFormat:@"%@", @"Wow this doesnt work??"] po [NSString stringWithFormat:@"%@", @"Wow this doesnt work??"] 回答1: It seems that the expression command in lldb can generally not evaluate functions with variable argument lists. It fails even with a simple C function: int foo(char *msg, ...) { return 17; } (lldb) expr foo("bar") (int) $2 =

Xcode 10, LLDB: Couldn't IRGen expression

由 霸气de小男生 提交于 2019-11-27 03:22:21
问题 Using Xcode 10, when I stop my app using a breakpoint and try to print the content of an object in the Console, I obtain: "Couldn't IRGen expression, no additional error" However, I can see the value of the object in the Variables View panel. How can I make it evaluate my expression instead? 回答1: Thanks. I solved with rebuild carthage framework like imtx.me/archives/2719.html carthage update --platform iOS --no-use-binaries 回答2: In lldb as a workaround you can use: fr v productVersion fr v

How can I set LLDB's default language to Swift?

由 牧云@^-^@ 提交于 2019-11-27 03:18:11
问题 I have a large Swift project that's technically a mixed project, as it has a small amount of Objective-C code. But whenever I drop into LLDB, the expression evaluator is expecting Objective-C syntax. I can use Swift with e -l swift -- but this is tedious to type every time. Can I default the LLDB expression evaluator to Swift? 回答1: There is a target level setting to force the language: (lldb) settings set target.language swift Or you can make an alias for swift specific expressions: command

Xcode/LLDB: How to get information about an exception that was just thrown?

由 与世无争的帅哥 提交于 2019-11-27 02:25:34
OK, so imagine that my breakpoint in objc_exception_throw has just triggered. I'm sitting at the debugger prompt, and I want to get some more information about the exception object. Where do I find it? The exception object is passed in as the first argument to objc_exception_throw . LLDB provides $arg1 .. $argn variables to refer to arguments in the correct calling convention, making it simple to print the exception details: (lldb) po $arg1 (lldb) po [$arg1 name] (lldb) po [$arg1 reason] Make sure to select the objc_exception_throw frame in the call stack before executing these commands. See

Why does the initial call to NSAttributedString with an HTML string take over 100 times longer than subsequent calls?

由 寵の児 提交于 2019-11-27 01:06:48
问题 I had a need to display HTML text inside my iOS app. I have decided I will use the built-in method on NSAttributedString , initWithData:options:documentAttributes:error:. The actual parsing works excellently, however, I seem to have come across a very odd bug, that only seems to manifest itself if I have the debugger attached. The first time that this method is called, it takes barely under 1 second to run on my iPhone 5S running iOS 7.0.4, and about 1.5 seconds on an iPod Touch 5th

GDB Vs LLDB debuggers

由 寵の児 提交于 2019-11-26 19:07:50
问题 What is the difference between GDB & LLDB debuggers? I recently upgraded my Xcode version from 4.2 to 4.3 & started getting warning to upgrade my debugger from GDB to LLDB. 回答1: LLDB is part of the LLVM suite of tools that Apple is moving to, including Clang. There are tons of improved features, including improved performance. There's a quick intro for GDB users here: http://lldb.llvm.org/tutorial.html However... You might want to take a trip over to the forums at developer.apple.com. There's

Weird error message in Xcode 4.3 with LLDB

由 眉间皱痕 提交于 2019-11-26 17:06:07
问题 I am currently writing an iOS app with Xcode 4.3.2. In most parts of my code, debugging with LLDB works just fine. However at some point I am getting a strange message while stepping through my code. When I hover over an iVar, it says Error [IRForTarget]: Couldn't find Objective-C indirect ivar symbol OBJC_IVAR_$_MyFancyClass.iVar instead of showing me the value. However, in the Variables View , I can see it just fine. Until I'm selecting Print Description of ... that is, because then, Xcode

Xcode - Error creating LLDB target

由 纵饮孤独 提交于 2019-11-26 15:44:40
问题 I'm getting this error whenever I build in XCode 6 beta 4. It seems to be making my app insanely slow. Warning: Error creating LLDB target at path '/***/***/***/***.app'- using an empty LLDB target which can cause slow memory reads from remote devices. What exactly does this mean and how do I fix it? Thanks in advance! 回答1: Did you use Architectures=$(ARCHS_STANDARD_32_BIT) and run your app on a 64 bit device? (iPhone 5S or iPhone 5S simulator) Apple seems to be stricter with apps which don't

View array in LLDB: equivalent of GDB's '@' operator in Xcode 4.1

由 守給你的承諾、 提交于 2019-11-26 11:47:59
问题 I would like to view an array of elements pointed to by a pointer. In GDB this can be done by treating the pointed memory as an artificial array of a given length using the operator \'@\' as *pointer @ length where length is the number of elements I want to view. The above syntax does not work in LLDB supplied with Xcode 4.1. Is there any way how to accomplish the above in LLDB? 回答1: Actually there is a simple way to do it, by casting the pointer to a pointer-to-array. For example, if you
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