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Reid Kleckner ff93e765b6 [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
benchmarks
bindings Revert "[OCaml] Handle nullptr in Llvm.global_initializer" 2019-10-01 08:29:07 +00:00
cmake Reland r349624: Let TableGen write output only if it changed, instead of doing so in cmake 2019-10-03 21:22:28 +00:00
docs [Docs] Adds section for Additional Topics on Reference page 2019-10-09 21:09:09 +00:00
examples [Orc] Roll back ThreadPool to std::function 2019-09-13 11:59:51 +00:00
include GlobalISel: Implement fewerElementsVector for G_BUILD_VECTOR 2019-10-09 22:44:43 +00:00
lib [codeview] Try to avoid emitting .cv_loc with line zero 2019-10-10 01:06:01 +00:00
projects Add few docs and implementation of strcpy and strcat. 2019-10-04 17:30:54 +00:00
resources
runtimes Adding support for overriding LLVM_ENABLE_RUNTIMES for runtimes builds. 2019-09-24 22:38:18 +00:00
test [codeview] Try to avoid emitting .cv_loc with line zero 2019-10-10 01:06:01 +00:00
tools [AIX][XCOFF][NFC] Change the SectionLen field name of CSect Auxiliary entry to SectionOrLength. 2019-10-09 16:19:39 +00:00
unittests [WebAssembly] Fix tests missed in rL374235 2019-10-09 23:06:38 +00:00
utils gn build: Merge r374245 2019-10-09 23:10:49 +00:00
.arcconfig
.clang-format
.clang-tidy
.gitattributes Fix the "git modified" issue on the preserve-comments-crlf.s. 2019-09-10 12:17:49 +00:00
.gitignore
CMakeLists.txt Add few docs and implementation of strcpy and strcat. 2019-10-04 17:30:54 +00:00
CODE_OWNERS.TXT
configure
CREDITS.TXT Update email address. 2019-07-17 07:02:02 +00:00
LICENSE.TXT
llvm.spec.in
LLVMBuild.txt
README.txt Test commit. 2019-10-03 14:57:49 +00:00
RELEASE_TESTERS.TXT

README.txt 

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