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f4a702c079
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Alexey Samsonov f4a702c079 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).


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@210492 91177308-0d34-0410-b5e6-96231b3b80d8
2014-06-09 21:53:47 +00:00
autoconf
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
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
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
.clang-format
.gitignore
CMakeLists.txt Make LINK_POLLY_INTO_TOOLS work with the CMake build 2014-06-06 06:39:00 +00:00
CODE_OWNERS.TXT
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
LICENSE.TXT
llvm.spec.in
LLVMBuild.txt
Makefile
Makefile.common
Makefile.config.in
Makefile.rules
README.txt

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