[lldb-dev] Line number resolution problem

[Mario Zechner]

Here's the dwarfdump: http://pastebin.com/4DyfLrtc

That tells me that there aren't any addresses associated with the missing
lines.

They are in the LLVM IR http://pastebin.com/zBwtwPgh

But they are missing from the generated assembler code:
http://pastebin.com/t6fvTXZU

My guess would be that we have some LLVM optimization turned on that
eliminates the code for the missing lines. I'll investigate.

Thanks a lot for your help, really appreciate it. Sorry if i wasted your
time.

On Wed, Oct 8, 2014 at 8:27 PM, Greg Clayton <gclayton at apple.com> wrote:

> Please attach the output of "dwarfdump --debug-line -e <FILE>". I can tell
> you more when I see that output.
>
> Greg
>
> > On Oct 8, 2014, at 5:10 AM, Mario Zechner <badlogicgames at gmail.com>
> wrote:
> >
> > Hi,
> >
> > i'm currently trying to track down the following issue. We create LLVM
> IR like this
> > compilation unit: JdwpThreads.java
> >    ; line 8
> >    %t16 = load %Object** %$r6, !dbg !{i32 8, i32 0, metadata !33, null}
> >     store %Object* %t16, %Object** %r4, !dbg !{i32 8, i32 0, metadata
> !33, null}
> >
> >     ; line 19
> >     call void @"llvm.dbg.declare"(metadata !{%Object** %r4}, metadata
> !38), !dbg !{i32 19, i32 0, metadata !34, null}
> >     %t17 = load %Object** %r4, !dbg !{i32 19, i32 0, metadata !34, null}
> >     call void
> @"[j]java.lang.Thread.start()V[Invokevirtual(com/robovm/debug/server/apps/JdwpThreads,java/lang/Thread)]"(%Env*
> %p0, %Object* %t17), !dbg !{i32 19, i32 0, metadata !34, null}
> >
> >     ; line 20
> >     %t18 = trunc i32 0 to i8, !dbg !{i32 20, i32 0, metadata !34, null}
> >     call void
> @"[j]com.robovm.debug.server.apps.JdwpThreads.stopped(Z)[set]"(%Env* %p0,
> i8 %t18), !dbg !{i32 20, i32 0, metadata !34, null}
> >
> >     ; line 21
> >     %t19 = load %Object** %r4, !dbg !{i32 21, i32 0, metadata !34, null}
> >     call void
> @"[j]java.lang.Thread.join()V[Invokevirtual(com/robovm/debug/server/apps/JdwpThreads,java/lang/Thread)]"(%Env*
> %p0, %Object* %t19), !dbg !{i32 21, i32 0, metadata !34, null}
> >
> > When setting a breakpoint for line 19 or 20 in that compilation unit,
> LLDB resolves it to line 21
> >
> > (lldb) br set -f JdwpThreads.java -l 19
> >
> > Breakpoint 1: where =
> JdwpThreadTest`[J]com.robovm.debug.server.apps.JdwpThreads.main([Ljava/lang/String;)V
> + 282 at JdwpThreads.java:21, address = 0x0028531f
> >
> > (lldb) br set -f JdwpThreads.java -l 20
> >
> > Breakpoint 2: where =
> JdwpThreadTest`[J]com.robovm.debug.server.apps.JdwpThreads.main([Ljava/lang/String;)V
> + 282 at JdwpThreads.java:21, address = 0x0028531f
> >
> >
> > The functions being called are all inlined functions. I suspected that
> to be the issue but don't know how to resolve it.
> >
> > I'm a bit puzzled as to why that is and would appreciate any pointers. I
> can provide a Mac OS X binary or a dwarfdump if required.
> >
> > Thanks,
> > Mario
> > _______________________________________________
> > lldb-dev mailing list
> > lldb-dev at cs.uiuc.edu
> > http://lists.cs.uiuc.edu/mailman/listinfo/lldb-dev
>
>
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