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Adrian Prantl 95bcf12f18 Salvage debug info from instructions about to be deleted 
[Reapplies r297971 and punting on finding a better API for findDbgValues()]

This patch improves debug info quality in InstCombine by looking at
values that are about to be deleted, checking whether there are any
dbg.value instrinsics referring to them, and potentially encoding the
semantics of the deleted instruction into the dbg.value's
DIExpression.

In the example in the testcase (which was extracted from XNU) there is a sequence of

 %4 = load %struct.entry*, %struct.entry** %next2, align 8, !dbg !41
 %5 = bitcast %struct.entry* %4 to i8*, !dbg !42
 %add.ptr4 = getelementptr inbounds i8, i8* %5, i64 -8, !dbg !43
 %6 = bitcast i8* %add.ptr4 to %struct.entry*, !dbg !44
 call void @llvm.dbg.value(metadata %struct.entry* %6, i64 0, metadata !20, metadata !21), !dbg 34

When these instructions are eliminated by instcombine one after
another, we can still salvage the otherwise dead debug info:

- Bitcasts have no effect, so have the dbg.value point to operand(0)
- Loads can be expressed via a DW_OP_deref
- Constant gep instructions can be replaced by DWARF expression arithmetic

The API introduced by this patch is not specific to instcombine and
can be useful in other places, too.

rdar://problem/30725338

Differential Revision: https://reviews.llvm.org/D30919

llvm-svn: 297994
2017-03-16 21:14:09 +00:00
bindings [DebugInfo] Emit address space with DW_AT_address_class attribute for pointer and reference types 2017-03-08 23:55:44 +00:00
cmake [cmake] Refactor warning flag logic to use Unix warnings with clang-cl 2017-03-16 17:05:16 +00:00
docs Revert "[PGO] Value profile for size of memory intrinsic calls" 2017-03-16 13:16:35 +00:00
examples llvm/examples/Kaleidoscope/BuildingAJIT: More fixup corresponding to r295636. 2017-02-20 10:07:41 +00:00
include Salvage debug info from instructions about to be deleted 2017-03-16 21:14:09 +00:00
lib Salvage debug info from instructions about to be deleted 2017-03-16 21:14:09 +00:00
projects [cmake] Include openmp with add_llvm_external_project 2017-03-07 18:54:17 +00:00
resources
runtimes [CMake] Handle common options for runtimes build 2017-01-10 19:47:05 +00:00
test Salvage debug info from instructions about to be deleted 2017-03-16 21:14:09 +00:00
tools Create msbuild only when using MSVC 2017-03-16 20:24:14 +00:00
unittests [Support] Add support for getting file system permissions on Windows and implement sys::fs::set/getPermissions to work with them 2017-03-16 11:22:09 +00:00
utils Removed unnecessary semicolon. NFCI. 2017-03-15 22:50:47 +00:00
.arcconfig project_id is from another era in phabricator land and does not provide any value. 2016-09-27 15:47:29 +00:00
.clang-format
.clang-tidy .clang-tidy: correct style name is 'camelBack' not 'lowerCase'. 2016-09-13 19:04:26 +00:00
.gitignore [.gitignore] Update .gitignore to ignore a nested build directory 2017-02-24 23:09:30 +00:00
CMakeLists.txt remove Cmake option for LLVM_DISABLE_ABI_BREAKING_CHECKS_ENFORCING 2017-03-07 00:51:07 +00:00
CODE_OWNERS.TXT CODE_OWNERS: Take code ownership of instruction scheduling. 2017-03-10 18:34:37 +00:00
configure
CREDITS.TXT CODE_OWNERS: Take code ownership of instruction scheduling. 2017-03-10 18:34:37 +00:00
LICENSE.TXT Bump year to 2017 in LICENSE.txt 2017-01-12 18:02:42 +00:00
llvm.spec.in
LLVMBuild.txt
README.txt Test commit. Added a blank line. 2017-03-06 20:45:33 +00:00
RELEASE_TESTERS.TXT Update the release tester for MIPS. NFC. 2017-01-17 11:00:28 +00:00

README.txt 

Low Level Virtual Machine (LLVM)
================================

This directory and its subdirectories contain source code for LLVM,
a toolkit for the construction of highly optimized compilers,
optimizers, and runtime environments.

LLVM is open source software. You may freely distribute it under the terms of
the license agreement found in LICENSE.txt.

Please see the documentation provided in docs/ for further
assistance with LLVM, and in particular docs/GettingStarted.rst for getting
started with LLVM and docs/README.txt for an overview of LLVM's
documentation setup.

If you are writing a package for LLVM, see docs/Packaging.rst for our
suggestions.