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Alexey Samsonov e52f04f5e6 Generate better location ranges for some register-described variables. 
Don't terminate location ranges for register-described variables
at the end of machine basic block if this register is never modified
in the function body, except for the prologue and epilogue. Prologue
location is guessed by FrameSetup flags on MachineInstructions, while
epilogue location is deduced from debug locations of instructions
in the basic blocks ending with return instructions.

This patch is mostly targeted to fix non-trivial debug locations for
variables addressed via stack and frame pointers.

It is not really a generic fix. We can still produce poor debug info
for register-described variables if this register *is* modified somewhere
in the function, but in unrelated places. This might be the case for the debug
info in optimized binaries (e.g. for local variables in inlined functions).
LiveDebugVariables pass in CodeGen attempts to fix this problem by adjusting
DBG_VALUE instructions, but this pass is tied to greedy register allocator,
which is used in optimized builds only. Proper fix would likely involve
generalizing LiveDebugVariables to all register allocators. See more discussion
in http://reviews.llvm.org/D3933 review thread.

I'm proceeding with this patch to fix immediate severe problems and
important cases, e.g. fix completely broken debug info with AddressSanitizer
and fix PR19307 (missing debug info for by-value std::string arguments).

llvm-svn: 210492
2014-06-09 21:53:47 +00:00
autoconf Remove path_tclsh.m4. 2014-06-02 12:54:32 +00:00
bindings [OCaml] Unbreak Llvm_target.TargetMachine.set_verbose_asm 2014-06-09 17:34:34 +00:00
cmake Remove clang-specific libxml2 check from CMake 2014-06-06 05:08:42 +00:00
docs Update langref for unnamed_addr being allowed in aliases. 2014-06-09 21:21:33 +00:00
examples Try to fix the msvc build. 2014-04-29 23:37:02 +00:00
include Fold FEnv.h into the implementation 2014-06-09 18:28:53 +00:00
lib Generate better location ranges for some register-described variables. 2014-06-09 21:53:47 +00:00
projects Remove projects/sample. 2014-03-12 22:40:22 +00:00
test Generate better location ranges for some register-described variables. 2014-06-09 21:53:47 +00:00
tools tools: add a high level explanation for WoA EH data 2014-06-07 19:23:07 +00:00
unittests [C++11] Use 'nullptr'. 2014-06-08 22:29:17 +00:00
utils [C++11] Use 'nullptr'. 2014-06-08 22:29:17 +00:00
.arcconfig Updated phabricator server. 2014-04-07 03:57:04 +00:00
.clang-format Test commit. 2014-03-02 13:08:46 +00:00
.gitignore Remove projects/sample. 2014-03-12 22:40:22 +00:00
CMakeLists.txt Make LINK_POLLY_INTO_TOOLS work with the CMake build 2014-06-06 06:39:00 +00:00
CODE_OWNERS.TXT ARM Linux support 2014-04-02 23:03:28 +00:00
configure Touch configure to force clang's config.h.in reconfiguration on the build servers 2014-06-06 10:36:38 +00:00
CREDITS.TXT Update Credits. 2014-05-29 19:59:58 +00:00
LICENSE.TXT Remove projects/sample. 2014-03-12 22:40:22 +00:00
llvm.spec.in
LLVMBuild.txt Remove the very substantial, largely unmaintained legacy PGO 2013-10-02 15:42:23 +00:00
Makefile [configure/make] Propagate names of build host tools when making BuildTools 2014-03-25 21:45:41 +00:00
Makefile.common Makefile.common: Update a description, s/Source/SOURCES/ , according to MakefileGuide.html#control-variables . 2012-12-07 01:43:23 +00:00
Makefile.config.in Add a --enable-clang-plugin-support option to configure. 2014-03-10 16:58:35 +00:00
Makefile.rules autoconf: Fix libLLVM-Major-Minor-Patch.so symlink 2014-05-15 19:50:25 +00:00
README.txt Trivial test commit. 2014-04-26 19:05:45 +00:00

README.txt 

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

This directory and its subdirectories contain source code for the Low Level
Virtual Machine, 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're writing a package for LLVM, see docs/Packaging.rst for our
suggestions.