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Reid Kleckner 9d8f0b3519 [codeview] Try to avoid emitting .cv_loc with line zero 
Summary:
Visual Studio doesn't like it while stepping. It kicks you out of the
source view of the file being stepped through and tries to fall back to
the disassembly view.

Fixes PR43530

The fix is incomplete, because it's possible to have a basic block with
no source locations at all. In this case, we don't emit a .cv_loc, but
that will result in wrong stepping behavior in the debugger if the
layout predecessor of the location-less BB has an unrelated source
location. We could try harder to find a valid location that dominates or
post-dominates the current BB, but in general it's a dataflow problem,
and one still might not exist. I left a FIXME about this.

As an alternative, we might want to consider having the middle-end check
if its emitting codeview and get it to stop using line zero.

Reviewers: akhuang

Subscribers: hiraditya, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D68747

llvm-svn: 374267
 		2019-10-10 01:06:01 +00:00
..
AArch64 [ISEL][ARM][AARCH64] Tracking simple parameter forwarding registers 2019-10-08 09:43:05 +00:00
AMDGPU AMDGPU: Fix tests using old number for constant address space 2018-09-10 02:54:25 +00:00
ARM [ISEL][ARM][AARCH64] Tracking simple parameter forwarding registers 2019-10-08 09:43:05 +00:00
COFF [codeview] Try to avoid emitting .cv_loc with line zero 2019-10-10 01:06:01 +00:00
Generic Remove the obsolete BlockByRefStruct flag from LLVM IR 2019-09-18 22:38:56 +00:00
Inputs [DebugInfo] Add column info for inline sites 2019-07-12 19:25:45 +00:00
Lanai
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MIR [DebugInfo][If-Converter] Update call site info during the optimization 2019-10-08 15:43:12 +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 [DwarfExpression] Disallow some rewrites to avoid undefined behavior 2019-09-07 11:40:10 +00:00
PDB Make pdbdump-objfilename test work again 2019-07-09 17:02:51 +00:00
PowerPC [DWARF] - Emit the correct value for DW_AT_addr_base. 2018-09-20 09:17:36 +00:00
RISCV [DebugInfo] Some fields do not need relocations even relax is enabled. 2019-07-19 06:10:36 +00:00
Sparc Remove irrelevant references to legacy git repositories from 2019-01-15 16:18:52 +00:00
SystemZ [lit] Delete empty lines at the end of lit.local.cfg NFC 2019-06-17 09:51:07 +00:00
WebAssembly [WebAssembly] Make returns variadic 2019-10-09 21:42:08 +00:00
X86 llvm-dwarfdump: Support multiple debug_loclists contributions 2019-10-09 21:25:28 +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 [llvm-nm][llvm-readelf] Avoid single-dash -long-option in tests 2019-04-27 16:12:14 +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 [CommandLine] Don't allow unlimitted dashes for options. Part 1 or 5 2019-04-29 18:34:18 +00:00
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 [llvm-dwarfdump] --gdb-index: fix uninitialized TuListOffset 2019-06-19 13:51:29 +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 [llvm-readobj] Change -long-option to --long-option in tests. NFC 2019-05-01 05:27:20 +00:00
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-directory.s Fix more Windows bots after r360015. 2019-05-06 19:12:25 +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