Thanks Jim for the help. I would definitely like to work on this PR soon. Filed the PR here https://bugs.llvm.org/show_bug.cgi?id=34341
Regards, Karan On Thu, Aug 24, 2017 at 11:17 PM, Jim Ingham <jing...@apple.com> wrote: > > > On Aug 24, 2017, at 10:06 AM, karnajit wangkhem <karnaj...@gmail.com> > wrote: > > > > Hi Jim, > > > > Thanks for the valuable reply. Please find my comments inline. > > > > Regards, > > Karan > > > > On Wed, Aug 23, 2017 at 12:32 AM, Jim Ingham <jing...@apple.com> wrote: > > > > > On Aug 21, 2017, at 12:02 PM, karnajit wangkhem via lldb-dev < > lldb-dev@lists.llvm.org> wrote: > > > > > > Hi All, > > > > > > Below is a sample example, where target.source-map seems to have a > limitation. The limitation seems to be because > > > 1. lldb does not have an equivalent command like directory in gdb > > > > The gdb "dir" command seemed always to be more annoying than useful in > real situations. If your project had any complexity in the directory > structure you ended up having to add dir commands for all the > subdirectories, which got tedious quickly. Since you pretty much always > move your sources around rigidly, "source maps" are a more natural way to > specify this. > > > > Note, we could add a recursive "dir" command, but you can't do the > simpleminded recursive search or you'll mess up when the sources have same > named files in different directories. Because of this, again the source > maps seem more suited. > > > > > > -- Really a good info to know. Thanks! > > > > > 2. target.source-map does not accept multiple mapping entries. I > checked this only with freebsd. > > > > > > (lldb) settings show target.source-map > > > target.source-map (path-map) = > > > [0] "/home/karnajitw/lldb_test_execs/test_source_line1" -> > "/u/test/test_source_line1" > > > > That is not correct: > > > > (lldb) settings set target.source-map /some/source/path /tmp > /some/other/source/path /tmp > > (lldb) settings show target.source-map > > target.source-map (path-map) = > > [0] "/some/source/path" -> "/tmp" > > [1] "/some/other/source/path" -> "/tmp" > > > > or > > > > (lldb) set set target.source-map /some/source/path /tmp > > (lldb) set append target.source-map /some/other/source/path /tmp > > (lldb) set show target.source-map > > target.source-map (path-map) = > > [0] "/some/source/path" -> "/tmp" > > [1] "/some/other/source/path" -> "/tmp" > > > > - Thanks! This helped. > > > > > > > > 3. Haven't checked in the code yet, but if we see the mappings of > scenario 1, they all point to a single real path > /home/karnajitw/lldb_test_execs/test_source_line1. > But looks like the mapping logic only considers strings into account. But, > at the same time, I am not claiming that they should be interpreted as path > from a different machine during the mapping. > > > > > > > I'm not sure what you mean here. lldb does what it can to unwind the > source path, but it doesn't assume that those paths actually exist locally, > so the most it can do is remove redundant "/"-s and "/./"-s and unwind > ".."-s. We do this before most source path comparisons (it's part of the > FileSpec Equals method). We've been tinkering with this over time so make > sure you are using a recent version of lldb. If there are places where we > don't do this, then that's easily fixed. > > > > > > - Your answer is in line with what I wanted to know. My lldb should be > quite recent. But I used it only for freebsd currently. > > > > % ./lldb --version > > lldb version 5.0.0 (http://llvm.org/svn/llvm-project/lldb/trunk > revision 305778) > > clang revision 305546 > > llvm revision 305548 > > > > > > > I want to check on this issue in-depth. But before that, want to > confirm if this is real issue or there are other ways to deal these > scenarios which I am not aware of? > > > > > > I am referring below link for the lldb commands. > > > https://lldb.llvm.org/lldb-gdb.html > > > > > > 1. First scenario: Different souce file path representation > > > > > > [/home/karnajitw/lldb_test_execs/test_source_line1] $ clang -O0 -g > /home/karnajitw/lldb_test_execs///test_source_line1/main.c > /home/karnajitw/lldb_test_execs/../lldb_test_execs/test_source_line1/a/ainc.c > /home/karnajitw/lldb_test_execs/test_source_line1/a/b/binc.c > > > > > > Machine 1: /home/karnajitw/lldb_test_execs/test_source_line1 -> > Machine 2: /u/test/test_source_line1 > > > > > > test_source_line1 > > > |-- a > > > | |-- ainc.c > > > | |-- ainc.h > > > | `-- b > > > | |-- binc.c > > > | `-- binc.h > > > |-- a.out > > > `-- main.c > > > > > > % ./lldb test_source_line1/a.out > > > > > > (lldb) target create "test_source_line1/a.out" > > > Current executable set to 'test_source_line1/a.out' (x86_64). > > > (lldb) l main > > > File: /home/karnajitw/lldb_test_execs///test_source_line1/main.c > > > (lldb) l afn > > > File: /home/karnajitw/lldb_test_execs/../lldb_test_execs/test_ > source_line1/a/ainc.c > > > (lldb) l bfn > > > File: /home/karnajitw/lldb_test_execs/test_source_line1/a/b/binc.c > > > > > > (lldb) settings set target.source-map > > > /home/karnajitw/lldb_test_execs///test_source_line1 > /u/test/test_source_line1 > > > > > > (lldb) l main > > > File: /home/karnajitw/lldb_test_execs///test_source_line1/main.c > > > 1 #include "a/ainc.h" > > > 2 > > > 3 int main() > > > 4 { > > > 5 afn(); > > > 6 > > > 7 bfn(); > > > 8 > > > 9 return 0; > > > 10 } > > > (lldb) l afn > > > File: /home/karnajitw/lldb_test_execs/../lldb_test_execs/test_ > source_line1/a/ainc.c > > > (lldb) l bfn > > > File: /home/karnajitw/lldb_test_execs/test_source_line1/a/b/binc.c > > > > > > (lldb) settings set target.source-map /home/karnajitw/lldb_test_ > execs/../lldb_test_execs/test_source_line1 /u/test/test_source_line1 > > > > > > (lldb) l main > > > File: /home/karnajitw/lldb_test_execs///test_source_line1/main.c > > > (lldb) l afn > > > File: /home/karnajitw/lldb_test_execs/../lldb_test_execs/test_ > source_line1/a/ainc.c > > > 1 #include <stdio.h> > > > 2 #include "ainc.h" > > > 3 > > > 4 void afn() > > > 5 { > > > 6 printf("Hello this is afn...\n"); > > > 7 } > > > (lldb) l bfn > > > File: /home/karnajitw/lldb_test_execs/test_source_line1/a/b/binc.c > > > > > > (lldb) settings set target.source-map > > > /home/karnajitw/lldb_test_execs/test_source_line1 > /u/test/test_source_line1 > > > > > > (lldb) l main > > > File: /home/karnajitw/lldb_test_execs///test_source_line1/main.c > > > (lldb) l afn > > > File: /home/karnajitw/lldb_test_execs/../lldb_test_execs/test_ > source_line1/a/ainc.c > > > (lldb) l bfn > > > File: /home/karnajitw/lldb_test_execs/test_source_line1/a/b/binc.c > > > 1 #include <stdio.h> > > > 2 #include "binc.h" > > > 3 > > > 4 void bfn() > > > 5 { > > > 6 printf("Hello this is bfn...\n"); > > > 7 } > > > > I can't test the "///" part of this, clang seems to always collapse > these for me. But with a recent lldb, I see: > > > > $ clang -g -O0 -c '/tmp/sources/build/../files/hello.c' > > $ dwarfdump hello.o > > ... > > 0x0000000b: TAG_compile_unit [1] * > > AT_producer( "Apple LLVM version 9.0.0 (clang-900.0.31)" ) > > AT_language( DW_LANG_C99 ) > > AT_name( "/tmp/sources/build/../files/hello.c" ) > > > > So we did get a compile unit name with .. in it, but: > > > > lldbrulez:/tmp/sources/build > clang -g -O0 -o hello hello.o > > lldbrulez:/tmp/sources/build > lldb > > (lldb) file hello > > Current executable set to 'hello' (x86_64). > > (lldb) source list -n main > > File: /tmp/sources/build/../files/hello.c > > 1 #include <stdio.h> > > 2 > > 3 int > > 4 main() > > 5 { > > 6 printf ("Hello there.\n"); > > 7 return 0; > > 8 } > > > > So we do unwind the ..'s in this case. This example doesn't have > source-maps, but the same thing works if I move the sources and add just a > <build-top> -> <debug-top> mapping. As I say, we have been working these > ".." aware comparisons through all the file compares recently, so you may > just need to get a newer lldb. > > > > - Lets say in my above example, the function is this way > > main -> afn -> bfn > > > > Now, I breakpoint on bfn, now to get source list on all the 3 frames, I > will need this below mapping > > > > (lldb) > > target.source-map (path-map) = > > [0] "/home/karnajitw/lldb_test_execs///test_source_line1" -> > "/u/test/test_source_line1" > > [1] "/home/karnajitw/lldb_test_execs/../lldb_test_execs/test_source_line1" > -> "/u/test/test_source_line1" > > [2] "/home/karnajitw/lldb_test_execs/test_source_line1" -> > "/u/test/test_source_line1" > > > > Like the previous discussion, All the LHS and RHS actually refers to the > same path. So why we need 3 mappings here? But, as I have mentioned > previously the problem could be just in the freebsd version also. > > > > > > > > > > 2. Scenario 2: Deep directory structure > > > > > > <top>/obj/a/b/c/d/e/app/sub/../../../../../../../../src/a/b/ > c/d/e/app/sub/file > > > <top>/obj/a/b/c/d/e/app/../../../../../../../src/a/b/c/d/e/app/file > > > > > > - If we carry the copy the source file to machine 2, we cannot easily > map the source file without creating dummy <top>/obj/a/b/c/d/e/f/g. > > > > > You should only need to map <top> to <top>. The only reason you would > have to start specifying subdirectories is you have ones specified with > ".."-s, but that problem is properly handled by making the file comparisons > aware of backup operators. So if the comparisons are working right (again > check a more recent lldb) you should not need to deal with all these dots. > > > > > > - Checked with latest lldb build, its the same > > > > (lldb) version > > lldb version 6.0.0 (http://llvm.org/svn/llvm-project/lldb/trunk > revision 311075) > > clang revision 311072 > > llvm revision 311071 > > > > $ build/bin/lldb a.out > > (lldb) target create "a.out" > > Current executable set to 'a.out' (x86_64). > > (lldb) settings set target.source-map /home/karnajitw/lldbtest/obj/ > a/b/c/d/e/app/../../../../../../../src/a/b/c/d/e/app /home/karnajitw/app > > (lldb) l main > > File: /home/karnajitw/lldbtest/obj/a/b/c/d/e/app/../../../../../. > ./../src/a/b/c/d/e/app/main.c > > 1 #include "sub/subfile.h" > > 2 > > 3 int main() > > 4 { > > 5 subfn(); > > 6 > > 7 return 0; > > 8 } > > 9 > > (lldb) l subfn > > File: /home/karnajitw/lldbtest/obj/a/b/c/d/e/app/sub/../../../../ > ../../../../src/a/b/c/d/e/app/sub/subfile.c > > (lldb) settings append target.source-map /home/karnajitw/lldbtest/obj/ > a/b/c/d/e/app/sub/../../../../../../../../src/a/b/c/d/e/app > /home/karnajitw/app > > (lldb) l subfn > > File: /home/karnajitw/lldbtest/obj/a/b/c/d/e/app/sub/../../../../ > ../../../../src/a/b/c/d/e/app/sub/subfile.c > > 1 #include <stdio.h> > > 2 #include "subfile.h" > > 3 > > 4 void subfn() > > 5 { > > 6 printf("This is subfn...\n"); > > 7 } > > 8 > > > > It still needs both the mappings > > (lldb) settings show target.source-map > > target.source-map (path-map) = > > [0] > > "/home/karnajitw/lldbtest/obj/a/b/c/d/e/app/../../../../../../../src/a/b/c/d/e/app" > -> "/home/karnajitw/app" > > [1] > > "/home/karnajitw/lldbtest/obj/a/b/c/d/e/app/sub/../../../../../../../../src/a/b/c/d/e/app" > -> "/home/karnajitw/app" > > That does seem wrong. Please file a PR about this. > > There's a method in FileSpec (GetNormalizedPath) that canonicalizes paths > by doing the obvious text substitution (unwinding ..'s and removing /./ and > /// -> /, etc.) Somewhere in the comparison of the source and build paths > we aren't using this when we should do. There's also a FileSpec::Equal > method that allows a canonicalized comparison. It might be that there's > just some obvious place we should have been using that. > > I'm in the middle of something else right now, but if you have some time > to dig into this, it would probably be straightforward to track down where > we aren't using the right comparison. But if there's a PR, then even if > you don't have time, somebody else will get to the PR when they have a > chance. > > Thanks for chasing this down! > > Jim > > > > > > > > > > 3. Scenario 3: External libraries > > > - I haven't exactly tested this yet. But I belive in scenario too we > might need to change the source-map. > > > > External libraries should be no different from your project. I don't > see anything different needed here. > > > > > > - Agreed. > > > > Jim > > > > > > > > > > Please look into this and guide me for the same. > > > > > > Regards, > > > Karan > > > _______________________________________________ > > > lldb-dev mailing list > > > lldb-dev@lists.llvm.org > > > http://lists.llvm.org/cgi-bin/mailman/listinfo/lldb-dev > >
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