forked from OSchip/llvm-project
90 lines
5.1 KiB
HTML
Executable File
90 lines
5.1 KiB
HTML
Executable File
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml">
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
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<link href="style.css" rel="stylesheet" type="text/css" />
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<title>LLDB FAQ</title>
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</head>
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<body>
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<div class="www_title">
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Troubleshooting <strong>LLDB</strong>
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</div>
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<div id="container">
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<div id="content">
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<!--#include virtual="sidebar.incl"-->
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<div class="postfooter"></div>
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<div id="middle">
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<div class="post">
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<h1 class ="postheader">File and line breakpoints are not getting hit</h1>
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<div class="postcontent">
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<p>First you must make sure that your source files were compiled with
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debug information. Typically this means passing <code>-g</code> to the
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compiler when compiling your source file.
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</p>
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<p>When setting breakpoints in <b>implementation</b> source files
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(.c, cpp, cxx, .m, .mm, etc), LLDB by default will only search for compile units whose filename matches. If your
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code does tricky things like using <font color=purple>#include</font> to include source files:
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<code><pre><tt>% <b>cat foo.c</b>
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<font color=purple>#include</font> "bar.c"
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<font color=purple>#include</font> "baz.c"
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...
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</tt></pre></code>
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<p> This will cause breakpoints in "bar.c" to be inlined into the compile unit for "foo.c".
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If your code does this, or if your build system combines multiple files in some way such
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that breakpoints from one implementation file will be compiled into another implementation file,
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you will need to tell LLDB to always search for inlined breakpoint locations
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by adding the following line to your <code>~/.lldbinit</code> file:
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</p>
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<code><pre><tt>% <b>echo "settings set target.inline-breakpoint-strategy always" >> ~/.lldbinit</b></tt></pre></code>
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<p> This tells LLDB to always look in all compile units and search for breakpoint
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locations by file and line even if the implementation file doesn't match. Setting breakpoints
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in header files always searches all compile units because inline functions are commonly defined
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in header files and often cause multiple breakpoints to have source line information that matches
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many header file paths.
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</p>
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<p> If you set a file and line breakpoint using a full path to the source file, like Xcode does when setting a
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breakpoint in its GUI on Mac OS X when you click in the gutter of the source view, this path must match
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the full paths in the debug information. If the paths mismatch, possibly due to
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passing in a resolved source file path that doesn't match an unresolved path in the debug
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information, this can cause breakpoints to not be resolved. Try setting breakpoints using the file
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basename only.
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<p> If you are using an IDE and you move your project in your file system and build again, sometimes doing a
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clean then build will solve the issue.This will fix the issue if some .o files didn't get rebuilt
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after the move as the .o files in the build folder might still contain stale debug information with
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the old source locations.
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</p>
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</div>
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<div class="postfooter"></div>
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</div>
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</div>
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<div class="postfooter"></div>
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<div id="middle">
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<div class="post">
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<h1 class ="postheader">How do I check if I have debug symbols?</h1>
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<div class="postcontent">
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<p> Checking if a module has any compile units (source files) is a good way to check
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if there is debug information in a module:
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<code><pre><tt>
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(lldb) <b>file /tmp/a.out</b>
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(lldb) <b>image list</b>
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[ 0] 71E5A649-8FEF-3887-9CED-D3EF8FC2FD6E 0x0000000100000000 /tmp/a.out
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/tmp/a.out.dSYM/Contents/Resources/DWARF/a.out
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[ 1] 6900F2BA-DB48-3B78-B668-58FC0CF6BCB8 0x00007fff5fc00000 /usr/lib/dyld
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....
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(lldb) <b>script lldb.target.module['/tmp/a.out'].GetNumCompileUnits()</b>
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1
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(lldb) <b>script lldb.target.module['/usr/lib/dyld'].GetNumCompileUnits()</b>
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0
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</tt></pre></code>
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<p> Above we can see that "/tmp/a.out" does have a compile unit, and "/usr/lib/dyld" does not.
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</div>
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<div class="postfooter"></div>
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</div>
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</div>
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</div>
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</div>
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</body>
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</html>
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