Christian Mayer's Weblog

LLDB breakpoints are not working

[This post was originally posted as a Stackoverflow question.]

I have a file lldb.txt with LLDB commands:

target create PATH/TO/BINARY
br s -a 0x7fff5fc01031
br li
process launch --stop-at-entry

So I can start debugging a program with lldb -S lldb.txt. After launch the debugger stops at 0x7fff5fc01000 (under Mac OS X 10.10) in dyld. As you can see I want to stop at breakpoint 0x7fff5fc01031 in dyld.

The breakpoint is unresolved but locations = 1.

[lldb]> breakpoint list
Current breakpoints:
1: address = 0x00007fff5fc01031, locations = 1
	1.1: address = 0x00007fff5fc01031, unresolved, hit count = 0 

When I add the breakpoint manually then it’s resolved.

[lldb]> br s -a 0x7fff5fc01031
Breakpoint 2: where = dyld`_dyld_start + 49, address = 0x00007fff5fc01031
[lldb]> breakpoint list
Current breakpoints:
1: address = 0x00007fff5fc01031, locations = 1
	1.1: address = 0x00007fff5fc01031, unresolved, hit count = 0 

2: address = 0x00007fff5fc01031, locations = 1, resolved = 1, hit count = 0
	2.1: where = dyld`_dyld_start + 49, address = 0x00007fff5fc01031, resolved, hit count = 0

How can I add a breakpoint in my lldb.txt file which will be automatically resolved?

I don’t know if this is a bug or if I’m doing it wrong with breakpoints. I already checked out the newest version (lldb-330.99.0) from the LLDB Git repository and compiled it with xcodebuild. But it’s still unresolved.

Update, 2015-01-22 00:13: See the mailing list discussion. By the way, the TOT expression used in the discussion stands for Top of Tree.

Update, 2015-01-24 16:56: The first breakpoint from the source file (lldb.txt) which will work is after all images has been linked. This is in dyld.cpp at function _main(), line link(sMainExecutable, sEnv.DYLD_BIND_AT_LAUNCH, true, ImageLoader::RPathChain(NULL, NULL));

I reported bug #22323 to the bugtracker.

Update, 2015-03-05: It seems that they deleted my question on Stackoverflow.

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Posted on .
Categories: Programming
Tags: LLVM, LLDB, Debugger, ASM, Assembly, Assembler, Git, Breakpoint, Address, ToT, Top of Tree

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