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Jeremy Morse 2104fd09d6 [DebugInfo] Emit undef DBG_VALUEs when SDNodes are optimised out 
This is a fix for PR39896, where dbg.value's of SDNodes that have been
optimised out do not lead to "DBG_VALUE undef" instructions being created.
Such undef instructions are necessary to terminate earlier variable
ranges, otherwise variable values leak past the point where they're valid.

The "invalidated" flag of SDDbgValue is currently being abused to mean two
things:
 * The corresponding SDNode is now invalid
 * This SDDbgValue should not be emitted
Of which there are several legitimate combinations of meaning:
 * The SDNode has been invalidated and we should emit "DBG_VALUE undef"
 * The SDNode has been invalidated but the debug data was salvaged, don't
   emit anything for this SDDbgValue
 * This SDDbgValue has been emitted

This patch introduces distinct "Emitted" and "Invalidated" fields to the
SDDbgValue class, updates users accordingly, and generates "undef"
DBG_VALUEs for invalidated records. Awkwardly, there are circumstances
where we emit SDDbgValue's twice, specifically DebugInfo/X86/dbg-addr-dse.ll
which I've preserved.

Differential Revision: https://reviews.llvm.org/D55372

llvm-svn: 348751
2018-12-10 11:20:47 +00:00
benchmarks Pull google/benchmark library to the LLVM tree 2018-08-28 09:42:41 +00:00
bindings [bindings/go] Add Go bindings to LLVMGetIndices 2018-11-08 04:04:04 +00:00
cmake [CMake] Add support for NO_INSTALL_RPATH argument in llvm_add_library() 2018-12-07 09:12:54 +00:00
docs Introduce llvm.experimental.widenable_condition intrinsic 2018-12-07 14:39:46 +00:00
examples Fix build break from r347239 2018-11-19 18:51:11 +00:00
include [CostModel][X86][AArch64] Adjust cost of the scalarization part of min/max reduction. 2018-12-10 06:58:58 +00:00
lib [DebugInfo] Emit undef DBG_VALUEs when SDNodes are optimised out 2018-12-10 11:20:47 +00:00
projects [projects] Use directory name for add_llvm_external_projects 2018-12-04 00:12:03 +00:00
resources In MSVC builds embed a VERSIONINFO resource in our exe and DLL files. 2015-06-12 15:58:29 +00:00
runtimes Revert "[CMake] Pass Clang defaults to runtimes builds" 2018-07-13 20:01:55 +00:00
test [DebugInfo] Emit undef DBG_VALUEs when SDNodes are optimised out 2018-12-10 11:20:47 +00:00
tools [bugpoint] Find 'opt', etc., in bugpoint directory 2018-12-10 00:56:13 +00:00
unittests [TextAPI][elfabi] Make TBE handlers functions that return Errors 2018-12-10 02:36:33 +00:00
utils [gn build] Add build files for CodeGen subfolders AsmPrinter, GlobalISel, SelectionDAG. 2018-12-08 10:53:10 +00:00
.arcconfig [llvm] Set up .arcconfig to point to Diffusion L repository 2018-01-12 15:37:41 +00:00
.clang-format
.clang-tidy .clang-tidy: correct style name is 'camelBack' not 'lowerCase'. 2016-09-13 19:04:26 +00:00
.gitattributes [DebugInfo] Add DILabel metadata and intrinsic llvm.dbg.label. 2018-05-09 02:40:45 +00:00
.gitignore [git/svn] Ignore Visual Studio's CMakeSettings.json. 2018-10-29 14:51:02 +00:00
CMakeLists.txt [LLVM] Allow modulemap installation 2018-11-21 20:46:50 +00:00
CODE_OWNERS.TXT [CODE_OWNERS] Add myself as code owner for MinGW 2018-11-29 10:58:15 +00:00
configure Remove autoconf support 2016-01-26 21:29:08 +00:00
CREDITS.TXT add Kang Zhang(shkzhang@cn.ibm.com) to the CREDITS.TXT 2018-11-25 02:56:49 +00:00
LICENSE.TXT Update copyright year to 2018. 2018-06-18 12:22:17 +00:00
llvm.spec.in [Sparc] Implement i64 load/store support for 32-bit sparc. 2015-08-10 19:11:39 +00:00
LLVMBuild.txt
README.txt Test commit. 2018-09-22 01:01:03 +00:00
RELEASE_TESTERS.TXT Adding Yvan as release test backup for Diana 2018-11-08 11:51:27 +00:00

README.txt 

The LLVM Compiler Infrastructure
================================

This directory and its subdirectories contain source code for LLVM,
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LLVM is open source software. You may freely distribute it under the terms of
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Please see the documentation provided in docs/ for further
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documentation setup.

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