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David Stenberg b96943b6a0 [DebugInfo] Track multiple registers in DbgEntityHistoryCalculator 
Summary:
When calculating the debug value history, DbgEntityHistoryCalculator
would only keep track of register clobbering for the latest debug value
per inlined entity. This meant that preceding register-described debug
value fragments would live on until the next overlapping debug value,
ignoring any potential clobbering. This patch amends
DbgEntityHistoryCalculator so that it keeps track of all registers that
a inlined entity's currently live debug values are described by.

The DebugInfo/COFF/pieces.ll test case has had to be changed since
previously a register-described fragment would incorrectly outlive its
basic block.

The parent patch D59941 is expected to increase the coverage slightly,
as it makes sure that location list entries are inserted after clobbered
fragments, and this patch is expected to decrease it, as it stops
preceding register-described from living longer than they should. All in
all, this patch and the preceding patch has a negligible effect on the
output from `llvm-dwarfdump -statistics' for a clang-3.4 binary built
using the RelWithDebInfo build profile. "Scope bytes covered" increases
by 0.5%, and "variables with location" increases from 2212083 to
2212088, but it should improve the accuracy quite a bit.

This fixes PR40283.

Reviewers: aprantl, probinson, dblaikie, rnk, bjope

Reviewed By: aprantl

Subscribers: llvm-commits

Tags: #debug-info, #llvm

Differential Revision: https://reviews.llvm.org/D59942

llvm-svn: 358073
 		2019-04-10 11:28:28 +00:00
..
AArch64 [DebugInfo] Stop changing labels for register-described parameter DBG_VALUEs 2019-02-13 09:34:07 +00:00
AMDGPU AMDGPU: Fix tests using old number for constant address space 2018-09-10 02:54:25 +00:00
ARM [DebugInfo] Improve handling of clobbered fragments 2019-04-10 11:28:20 +00:00
COFF [DebugInfo] Track multiple registers in DbgEntityHistoryCalculator 2019-04-10 11:28:28 +00:00
Generic Add LLVM IR debug info support for Fortran COMMON blocks 2019-04-08 19:13:55 +00:00
Inputs [DebugInfo][llvm-symbolizer]Add some tests for edge cases when symbolizing 2019-02-06 10:13:14 +00:00
Lanai
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MIR [DebugInfo] Track multiple registers in DbgEntityHistoryCalculator 2019-04-10 11:28:28 +00:00
MSP430 MachineOperand/MIParser: Do not print debug-use flag, infer it 2018-10-30 23:28:27 +00:00
Mips [mips][micromips] Fix how values in .gcc_except_table are calculated 2019-02-07 22:57:33 +00:00
NVPTX [NVPTX][DEBUGINFO]Temp workaround for crash of ptxas: disable packed bytes in debug sections. 2019-03-08 21:29:17 +00:00
PDB [pdb] Add -type-stats and sort stats by descending size 2019-03-22 21:22:13 +00:00
PowerPC [DWARF] - Emit the correct value for DW_AT_addr_base. 2018-09-20 09:17:36 +00:00
RISCV [DebugInfo] Generate fixups as emitting DWARF .debug_line. 2018-08-01 02:18:06 +00:00
Sparc Remove irrelevant references to legacy git repositories from 2019-01-15 16:18:52 +00:00
SystemZ Replace "no-frame-pointer-*" function attributes with "frame-pointer" 2019-01-14 10:55:55 +00:00
WebAssembly [WebAssembly] Remove trailing whitespaces in tests (NFC) 2019-03-06 02:00:22 +00:00
X86 [DebugInfo] Improve handling of clobbered fragments 2019-04-10 11:28:20 +00:00
arange-overlap.test [llvm-symbolizer][test] Extract tests from llvm-symbolizer.test and simplify (#1) 2019-01-31 14:11:17 +00:00
arm-relocs.test
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check-debugify-preserves-analyses.ll
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cross-cu-inlining.test [llvm-symbolizer][test] Extract tests from llvm-symbolizer.test and simplify (#1) 2019-01-31 14:11:17 +00:00
cross-cu-scope.ll Specify REQUIRES: default_triple in two debuginfo tests 2018-11-06 00:16:32 +00:00
debugify-bogus-dbg-value.ll [Debugify] Allow unsigned values narrower than their variables 2018-07-06 17:32:40 +00:00
debugify-each.ll
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debugify-export.ll [Debugify] Export per-pass debug info loss statistics 2018-07-24 00:41:29 +00:00
debugify-report-missing-locs-only.ll Tighten up a test for -check-debugify, NFC 2018-07-02 17:08:36 +00:00
debugify.ll [DebugInfo] IR/Bitcode changes for DISubprogram flags. 2018-11-28 21:14:32 +00:00
debuglineinfo-macho.test
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debuglineinfo-path.ll Specify REQUIRES: default_triple in two debuginfo tests 2018-11-06 00:16:32 +00:00
debuglineinfo.test Reapply: DebugInfo: Assume an absence of ranges or high_pc on a CU means the CU is empty (devoid of code addresses) 2018-12-21 22:25:01 +00:00
debugmacinfo.test
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dwarfdump-64-bit-dwarf.test
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dwarfdump-accel.test
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dwarfdump-bad-lookup-address.test [DWARF] check whether the DIE is valid before querying for information 2019-04-03 17:13:45 +00:00
dwarfdump-debug-frame-simple.test
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dwarfdump-decompression-corrupt.test
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dwarfdump-decompression-error.test
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dwarfdump-dump-flags.test
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dwarfdump-dump-gdbindex.test [DWARF] Fix typo, .gnu_index -> .gdb_index 2018-11-02 20:34:40 +00:00
dwarfdump-dwp.test
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dwarfdump-implicit-const.test
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dwarfdump-invalid-line-table.test
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dwarfdump-invalid.test
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dwarfdump-macho-relocs.test
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dwarfdump-macho-universal.test
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dwarfdump-objc.test
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dwarfdump-pubnames.test
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dwarfdump-ranges.test Revert "[DWARF] reposting r342048, which was reverted in r342056 due to buildbot errors. Adjusted 2 test cases for ARM and darwin and fixed a bug with the original change in dsymutil." 2018-09-17 15:40:01 +00:00
dwarfdump-type-units.test
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dwarfdump-zlib.test
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dwo.ll
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gcc-local-mem-func.test [llvm-symbolizer][test] Extract tests from llvm-symbolizer.test and simplify (#1) 2019-01-31 14:11:17 +00:00
high-pc-constant.test [llvm-symbolizer][test] Extract tests from llvm-symbolizer.test and simplify (#1) 2019-01-31 14:11:17 +00:00
invalid-relocations.test [yaml2obj][obj2yaml] - Change how symbol's binding is descibed when parsing/dumping. 2019-04-03 14:53:42 +00:00
macro_link.ll
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member-pointers.o
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missing-abstract-variable.o
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omit-empty.ll
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pr34186.ll
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pr34672.ll
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precomp.test
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skeletoncu.ll
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strip-DIGlobalVariable.ll
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strip-loop-metadata.ll
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strip-module-flags.ll
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symbolize-64bit-address.test [DebugInfo][llvm-symbolizer]Add some tests for edge cases when symbolizing 2019-02-06 10:13:14 +00:00
symbolize-absolute-path-in-debug-line.s [DebugInfo][llvm-symbolizer]Add some tests for edge cases when symbolizing 2019-02-06 10:13:14 +00:00
symbolize-demangling.s [llvm-symbolizer][test] Extract tests from llvm-symbolizer.test and simplify (#2) 2019-01-31 14:17:33 +00:00
symbolize-gnu-debuglink-fallback.test [DebugInfo] Fix /usr/lib/debug llvm-symbolizer lookup with relative paths 2019-02-11 18:05:48 +00:00
symbolize-gnu-debuglink-no-realpath.test [DebugInfo] Fix mkdir use in test 2019-02-01 21:14:21 +00:00
symbolize-gnu-debuglink.test [llvm-symbolizer][test] Extract tests from llvm-symbolizer.test and simplify (#3) 2019-01-31 14:22:50 +00:00
symbolize-inlined.test [llvm-symbolizer][test] Extract tests from llvm-symbolizer.test and simplify (#3) 2019-01-31 14:22:50 +00:00
symbolize-macho-universal-unknown-arch.test [llvm-symbolizer][test] Extract tests from llvm-symbolizer.test and simplify (#2) 2019-01-31 14:17:33 +00:00
symbolize-macho-universal.test [llvm-symbolizer][test] Extract tests from llvm-symbolizer.test and simplify (#2) 2019-01-31 14:17:33 +00:00
symbolize-missing-file.test [llvm-symbolizer][test] Extract tests from llvm-symbolizer.test and simplify (#3) 2019-01-31 14:22:50 +00:00
symbolize-no-debug-str.test [DebugInfo][llvm-symbolizer]Add some tests for edge cases when symbolizing 2019-02-06 10:13:14 +00:00
symbolize-shared-abbrev.s [DebugInfo][llvm-symbolizer]Add some tests for edge cases when symbolizing 2019-02-06 10:13:14 +00:00
symbolize-split-dwarf-empty.test [llvm-symbolizer][test] Rename and tweak tests using llvm-symbolizer 2019-02-01 10:24:55 +00:00
symbolize-split-dwarf-no-skel-address.test [llvm-symbolizer][test] Rename and tweak tests using llvm-symbolizer 2019-02-01 10:24:55 +00:00
symbolize-stripped-sections.test [DebugInfo][llvm-symbolizer]Add some tests for edge cases when symbolizing 2019-02-06 10:13:14 +00:00
symbolize-stripped.test [llvm-symbolizer][test] Extract tests from llvm-symbolizer.test and simplify (#1) 2019-01-31 14:11:17 +00:00
symbolize-tu.test [llvm-symbolizer][test] Rename and tweak tests using llvm-symbolizer 2019-02-01 10:24:55 +00:00
symbolize-zlib.test [llvm-symbolizer][test] Rename and tweak tests using llvm-symbolizer 2019-02-01 10:24:55 +00:00
symbolize.test [llvm-symbolizer][test] Rename and tweak tests using llvm-symbolizer 2019-02-01 10:24:55 +00:00
typeunit-header.test
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unrolled-loop-remainder.ll Remove irrelevant references to legacy git repositories from 2019-01-15 16:18:52 +00:00