[llvm] r233207 - Linker: Rewrite dwarfdump checks from r233164
David Blaikie
dblaikie at gmail.com
Wed Mar 25 14:20:50 PDT 2015
On Wed, Mar 25, 2015 at 2:14 PM, Duncan P. N. Exon Smith <
dexonsmith at apple.com> wrote:
>
> > On 2015-Mar-25, at 14:11, David Blaikie <dblaikie at gmail.com> wrote:
> >
> >
> >
> > On Wed, Mar 25, 2015 at 2:08 PM, Duncan P. N. Exon Smith <
> dexonsmith at apple.com> wrote:
> >
> > > On 2015-Mar-25, at 13:06, David Blaikie <dblaikie at gmail.com> wrote:
> > >
> > >
> > >
> > > On Wed, Mar 25, 2015 at 12:57 PM, Duncan P. N. Exon Smith <
> dexonsmith at apple.com> wrote:
> > > Author: dexonsmith
> > > Date: Wed Mar 25 14:57:42 2015
> > > New Revision: 233207
> > >
> > > URL: http://llvm.org/viewvc/llvm-project?rev=233207&view=rev
> > > Log:
> > > Linker: Rewrite dwarfdump checks from r233164
> > >
> > > Rewrite the checks from r233164 that I temporarily disabled in r233165.
> > >
> > > It turns out that the line-tables only debug info we emit from `llc` is
> > > (intentionally) different on Linux than on Darwin.
> > >
> > > Does this need to test gmlt rather than normal -g?
> >
> > I suppose not, but it's easier to hand-write line-tables only debug info,
>
> Really?! I had assumed the backend required more fidelity or details or
> something when not in `-gmlt` mode. I'll play around.
>
Nah - in fact there was no backend option for gmlt until Eric added it to
avoid emitting aranges, I think? Prior to that it was purely a frontend
feature that just skipped creating the metadata for types, parameters,
variables, etc.
Then I used the flag Eric added to make the gmlt even smarter in the
backend (by omitting unused subprograms, omitting unnecessary attributes,
etc).
>
> >
> > You can create minimal debug inof by hand without making it "gmlt" debug
> info - don't set that gmlt flag on the CU and it shouldn't do the magical
> "minimal subprogram" thing on non-darwin anymore.
> >
> > and that should be sufficient for checking if the correct subprogram is
> > around.
> >
> > >
> > > If it does need to test gmlt, which bits of it does it need to test?
> Is the functionality you want to test actually used in both Darwin and
> non-Darwin, or is it only under the non-Darwin "skip unnecessary
> subprogram" stuff I implemented? (in which cas running the test on Darwin
> doesn't actually tell you anything about whether the functionality is
> working - so it might be more suitable to use a fixed triple?)
> >
> > I want to test:
> >
> > 1. That the merged IR zeros out Functions (although I imagine this could
> > change eventually).
> > 2. That `llc` doesn't crash.
> > 3. That in the output DWARF, the debug info from the `weak` version of
> > `@foo` is what's actually used (not the debug info from the discarded
> > `linkonce` version of `@foo`).
> >
> > All these things should be true for both Linux and Darwin (and any other
> > platform we support, I think).
> >
> > >
> > > r218129 started
> > > skipping emission of subprograms with no inlined subroutines, and
> > > r218702 was a spiritual revert of that behaviour for Darwin.
> > >
> > > I think we can still test this in a platform-neutral way.
> > >
> > > - Stop checking for the possibly missing `DW_TAG_subprogram` defining
> > > the debug info for the real version of `@foo`.
> > > - Start checking the line tables, ensuring that the right debug info
> > > was used to generate them (grabbing `DW_AT_low_pc` from the compile
> > > unit).
> > > - I changed up the line numbers used in the "weak" version so it's
> > > easier to follow.
> > >
> > > This should hopefully finish off PR22792.
> > >
> > > Modified:
> > > llvm/trunk/test/Linker/Inputs/subprogram-linkonce-weak.ll
> > > llvm/trunk/test/Linker/subprogram-linkonce-weak.ll
> > >
> > > Modified: llvm/trunk/test/Linker/Inputs/subprogram-linkonce-weak.ll
> > > URL:
> http://llvm.org/viewvc/llvm-project/llvm/trunk/test/Linker/Inputs/subprogram-linkonce-weak.ll?rev=233207&r1=233206&r2=233207&view=diff
> > >
> ==============================================================================
> > > --- llvm/trunk/test/Linker/Inputs/subprogram-linkonce-weak.ll
> (original)
> > > +++ llvm/trunk/test/Linker/Inputs/subprogram-linkonce-weak.ll Wed Mar
> 25 14:57:42 2015
> > > @@ -1,7 +1,7 @@
> > > define weak i32 @foo(i32 %a, i32 %b) {
> > > entry:
> > > - %sum = call i32 @fastadd(i32 %a, i32 %b), !dbg !MDLocation(line: 2,
> scope: !3)
> > > - ret i32 %sum, !dbg !MDLocation(line: 3, scope: !3)
> > > + %sum = call i32 @fastadd(i32 %a, i32 %b), !dbg !MDLocation(line:
> 52, scope: !3)
> > > + ret i32 %sum, !dbg !MDLocation(line: 53, scope: !3)
> > > }
> > >
> > > declare i32 @fastadd(i32, i32)
> > > @@ -12,5 +12,5 @@ declare i32 @fastadd(i32, i32)
> > > !llvm.dbg.cu = !{!1}
> > > !1 = !MDCompileUnit(language: DW_LANG_C99, file: !2, subprograms:
> !{!3}, emissionKind: 2)
> > > !2 = !MDFile(filename: "foo.c", directory: "/path/to/dir")
> > > -!3 = !MDSubprogram(file: !2, scope: !2, line: 1, name: "foo",
> function: i32 (i32, i32)* @foo, type: !4)
> > > +!3 = !MDSubprogram(file: !2, scope: !2, line: 51, name: "foo",
> function: i32 (i32, i32)* @foo, type: !4)
> > > !4 = !MDSubroutineType(types: !{})
> > >
> > > Modified: llvm/trunk/test/Linker/subprogram-linkonce-weak.ll
> > > URL:
> http://llvm.org/viewvc/llvm-project/llvm/trunk/test/Linker/subprogram-linkonce-weak.ll?rev=233207&r1=233206&r2=233207&view=diff
> > >
> ==============================================================================
> > > --- llvm/trunk/test/Linker/subprogram-linkonce-weak.ll (original)
> > > +++ llvm/trunk/test/Linker/subprogram-linkonce-weak.ll Wed Mar 25
> 14:57:42 2015
> > > @@ -66,8 +66,8 @@ entry:
> > > ; LW: ![[FOOINBAR]] = !MDLocation(line: 2, scope: ![[FOOSP]],
> inlinedAt: ![[BARIA:[0-9]+]])
> > > ; LW: ![[BARIA]] = !MDLocation(line: 12, scope: ![[BARSP]])
> > > ; LW: ![[BARRET]] = !MDLocation(line: 13, scope: ![[BARSP]])
> > > -; LW: ![[FOOCALL]] = !MDLocation(line: 2, scope: ![[WEAKFOOSP]])
> > > -; LW: ![[FOORET]] = !MDLocation(line: 3, scope: ![[WEAKFOOSP]])
> > > +; LW: ![[FOOCALL]] = !MDLocation(line: 52, scope: ![[WEAKFOOSP]])
> > > +; LW: ![[FOORET]] = !MDLocation(line: 53, scope: ![[WEAKFOOSP]])
> > >
> > > ; Same as above, but reordered.
> > > ; WL: ![[WCU]] = !MDCompileUnit({{.*}} subprograms: ![[WSPs:[0-9]+]]
> > > @@ -81,8 +81,8 @@ entry:
> > > ; WL: ![[FOOSP]] = {{.*}}!MDSubprogram(name: "foo",
> > > ; Note, for symmetry, this should be "NOT: function:" and "SAME:
> ){{$}}".
> > > ; WL-SAME: function: i32 (i32, i32)* @foo
> > > -; WL: ![[FOOCALL]] = !MDLocation(line: 2, scope: ![[WEAKFOOSP]])
> > > -; WL: ![[FOORET]] = !MDLocation(line: 3, scope: ![[WEAKFOOSP]])
> > > +; WL: ![[FOOCALL]] = !MDLocation(line: 52, scope: ![[WEAKFOOSP]])
> > > +; WL: ![[FOORET]] = !MDLocation(line: 53, scope: ![[WEAKFOOSP]])
> > > ; WL: ![[FOOINBAR]] = !MDLocation(line: 2, scope: ![[FOOSP]],
> inlinedAt: ![[BARIA:[0-9]+]])
> > > ; WL: ![[BARIA]] = !MDLocation(line: 12, scope: ![[BARSP]])
> > > ; WL: ![[BARRET]] = !MDLocation(line: 13, scope: ![[BARSP]])
> > > @@ -96,15 +96,18 @@ entry:
> > > ; Crasher for llc.
> > > ; REQUIRES: object-emission
> > > ; RUN: %llc_dwarf -filetype=obj -O0 %t1 -o %t1.o
> > > -; RUNDISABLED: llvm-dwarfdump %t1.o -debug-dump=info | FileCheck %s
> -check-prefix=DWLW
> > > +; RUN: llvm-dwarfdump %t1.o -debug-dump=all | FileCheck %s
> -check-prefix=DWLW -check-prefix=DW
> > > ; RUN: %llc_dwarf -filetype=obj -O0 %t2 -o %t2.o
> > > -; RUNDISABLED: llvm-dwarfdump %t2.o -debug-dump=info | FileCheck %s
> -check-prefix=DWWL
> > > -; Getting different dwarfdump output on different platforms, so I've
> > > -; temporarily disabled the Dwarf FileChecks while leaving in the
> crash tests.
> > > -; I'll keep using PR22792 to track this.
> > > +; RUN: llvm-dwarfdump %t2.o -debug-dump=all | FileCheck %s
> -check-prefix=DWWL -check-prefix=DW
> > > +; Don't check for the DW_TAG_subprogram for the weak version of
> @foo. It has
> > > +; no inlined subroutines, so with -gmlt may not exist (debuggers can
> find the
> > > +; aranges in the compile unit and look in the line table directly).
> See the
> > > +; checks against the line table that follow.
> > >
> > > +; DW-LABEL: .debug_info contents:
> > > ; DWLW: DW_TAG_compile_unit
> > > ; DWLW: DW_AT_name {{.*}}"bar.c"
> > > +; DWLW: DW_AT_low_pc [DW_FORM_addr] ([[BARLOW:0x[0-9a-f]+]])
> > > ; DWLW: DW_TAG_subprogram
> > > ; DWLW-NOT: DW_AT_{{[lowhigh]*}}_pc
> > > ; DWLW: DW_AT_name {{.*}}foo
> > > @@ -117,20 +120,15 @@ entry:
> > > ; DWLW: DW_AT_abstract_origin
> > > ; DWLW: DW_TAG_compile_unit
> > > ; DWLW: DW_AT_name {{.*}}"foo.c"
> > > -; DWLW: DW_TAG_subprogram
> > > -; DWLW: DW_AT_low_pc
> > > -; DWLW: DW_AT_high_pc
> > > -; DWLW: DW_AT_name {{.*}}foo
> > > +; DWLW: DW_AT_low_pc [DW_FORM_addr] ([[FOOLOW:0x[0-9a-f]+]])
> > >
> > > ; The DWARF output is already symmetric (just reordered).
> > > ; DWWL: DW_TAG_compile_unit
> > > ; DWWL: DW_AT_name {{.*}}"foo.c"
> > > -; DWWL: DW_TAG_subprogram
> > > -; DWWL: DW_AT_low_pc
> > > -; DWWL: DW_AT_high_pc
> > > -; DWWL: DW_AT_name {{.*}}foo
> > > +; DWWL: DW_AT_low_pc [DW_FORM_addr] ([[FOOLOW:0x[0-9a-f]+]])
> > > ; DWWL: DW_TAG_compile_unit
> > > ; DWWL: DW_AT_name {{.*}}"bar.c"
> > > +; DWWL: DW_AT_low_pc [DW_FORM_addr] ([[BARLOW:0x[0-9a-f]+]])
> > > ; DWWL: DW_TAG_subprogram
> > > ; DWWL-NOT: DW_AT_{{[lowhigh]*}}_pc
> > > ; DWWL: DW_AT_name {{.*}}foo
> > > @@ -141,3 +139,20 @@ entry:
> > > ; DWWL: DW_AT_name {{.*}}bar
> > > ; DWWL: DW_TAG_inlined_subroutine
> > > ; DWWL: DW_AT_abstract_origin
> > > +
> > > +; DW-LABEL: .debug_line contents:
> > > +; Check that the low_pc entries from above hit the right files.
> > > +
> > > +; DWLW-LABEL: file_names[{{ *}}1]{{.*}} bar.c
> > > +; DWLW: [[BARLOW]] 0 0 1 0 0 is_stmt
> > > +; DWLW: [[BARLOW]] 2 0 1 0 0 is_stmt prologue_end
> > > +; DWLW-LABEL: file_names[{{ *}}1]{{.*}} foo.c
> > > +; DWLW: [[FOOLOW]] 0 0 1 0 0 is_stmt
> > > +; DWLW: [[FOOLOW]] 52 0 1 0 0 is_stmt prologue_end
> > > +
> > > +; DWWL-LABEL: file_names[{{ *}}1]{{.*}} foo.c
> > > +; DWWL: [[FOOLOW]] 0 0 1 0 0 is_stmt
> > > +; DWWL: [[FOOLOW]] 52 0 1 0 0 is_stmt prologue_end
> > > +; DWWL-LABEL: file_names[{{ *}}1]{{.*}} bar.c
> > > +; DWWL: [[BARLOW]] 0 0 1 0 0 is_stmt
> > > +; DWWL: [[BARLOW]] 2 0 1 0 0 is_stmt prologue_end
> > >
> > >
> > > _______________________________________________
> > > llvm-commits mailing list
> > > llvm-commits at cs.uiuc.edu
> > > http://lists.cs.uiuc.edu/mailman/listinfo/llvm-commits
> > >
>
>
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