[PATCH] D85018: [WIP][POC][DebugInfo] Support for DW_AT_start_scope for scoped variables
Sourabh Singh Tomar via Phabricator via llvm-commits
llvm-commits at lists.llvm.org
Fri Jul 31 03:43:03 PDT 2020
SouraVX created this revision.
SouraVX added reviewers: vsk, aprantl, dblaikie, probinson, jini.susan.george, alok.
Herald added subscribers: llvm-commits, hiraditya.
Herald added a reviewer: sscalpone.
Herald added a project: LLVM.
SouraVX requested review of this revision.
Herald added a subscriber: ormris.
This patch is POC for correctly capturing scope information for
reduced scope variables.
For more context please refer to llvm-dev discussion:
http://lists.llvm.org/pipermail/llvm-dev/2020-April/140962.html
Intent of this patch is to convey overall design/functionality,
seek feedback and converge.
There was an unfortunate delay between the patch and discussion,
Overall design was also discussed in above link(later).
Impact on debug-info statistics(collected from compiling trunk-clang
before and after this patch):
Before this patch:
llvm-dwarfdump --show-section-sizes bin/clang
file: bin/clang
----------------------------------------------------
SECTION SIZE (b)
------------- ---------
.debug_info 900357322 (58.29%)
.debug_loc 868784 (0.06%)
.debug_ranges 33411008 (2.16%)
.debug_abbrev 4227906 (0.27%)
.debug_line 117115289 (7.58%)
.debug_str 182932094 (11.84%)
Total Size: 1238912403 (80.21%)
Total File Size: 1544622040
----------------------------------------------------
After this patch:
llvm-dwarfdump --show-section-sizes bin/clang
----------------------------------------------------
file: bin/clang
----------------------------------------------------
SECTION SIZE (b)
------------- ---------
.debug_info 902111430 (57.62%)
.debug_loc 19768599 (1.26%)
.debug_ranges 33412752 (2.13%)
.debug_abbrev 4305427 (0.28%)
.debug_line 117266710 (7.49%)
.debug_str 182933982 (11.69%)
Total Size: 1259798900 (80.47%)
Total File Size: 1565509704
----------------------------------------------------
Repository:
rG LLVM Github Monorepo
https://reviews.llvm.org/D85018
Files:
llvm/lib/CodeGen/AsmPrinter/DwarfCompileUnit.cpp
llvm/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
llvm/lib/CodeGen/AsmPrinter/DwarfDebug.h
llvm/lib/CodeGen/SelectionDAG/FastISel.cpp
llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
llvm/test/DebugInfo/X86/DW_AT_start_scope.ll
llvm/test/DebugInfo/X86/op_deref.ll
llvm/test/DebugInfo/dwarfdump-dataLocationExp.ll
llvm/test/DebugInfo/dwarfdump-dataLocationVar.ll
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