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Shiva Chen 2c864551df [DebugInfo] Add DILabel metadata and intrinsic llvm.dbg.label. 
In order to set breakpoints on labels and list source code around
labels, we need collect debug information for labels, i.e., label
name, the function label belong, line number in the file, and the
address label located. In order to keep these information in LLVM
IR and to allow backend to generate debug information correctly.
We create a new kind of metadata for labels, DILabel. The format
of DILabel is

!DILabel(scope: !1, name: "foo", file: !2, line: 3)

We hope to keep debug information as much as possible even the
code is optimized. So, we create a new kind of intrinsic for label
metadata to avoid the metadata is eliminated with basic block.
The intrinsic will keep existing if we keep it from optimized out.
The format of the intrinsic is

llvm.dbg.label(metadata !1)

It has only one argument, that is the DILabel metadata. The
intrinsic will follow the label immediately. Backend could get the
label metadata through the intrinsic's parameter.

We also create DIBuilder API for labels to be used by Frontend.
Frontend could use createLabel() to allocate DILabel objects, and use
insertLabel() to insert llvm.dbg.label intrinsic in LLVM IR.

Differential Revision: https://reviews.llvm.org/D45024

Patch by Hsiangkai Wang.

llvm-svn: 331841
 		2018-05-09 02:40:45 +00:00
clang Remove \brief commands from doxygen comments. 2018-05-09 01:00:01 +00:00
clang-tools-extra Partially revert r331456: [clang-tidy] Remove AnalyzeTemporaryDtors option. 2018-05-08 23:15:58 +00:00
compiler-rt [sanitizer] Remove unneeded blank lines 2018-05-09 00:44:26 +00:00
debuginfo-tests [Darwin] Specify DWARF 2/4 when running apple accelerator tests. 2018-02-26 20:56:45 +00:00
libclc remquo: Flush denormals if not supported 2018-05-03 05:44:28 +00:00
libcxx Revert "Emit an error when mixing <stdatomic.h> and <atomic>" 2018-05-08 22:50:35 +00:00
libcxxabi Fix test failure for missing _LIBCPP_ENABLE_CXX17_REMOVED_UNEXPECTED_FUNCTIONS 2018-05-03 12:44:27 +00:00
libunwind [cmake] Remove duplicate command line options from build 2018-04-05 20:27:50 +00:00
lld [PPC64] Add lazy symbol resolution stubs. 2018-05-09 02:07:53 +00:00
lldb Add support to object files for accessing the .debug_types section 2018-05-08 17:19:24 +00:00
llgo irgen: Create functions instead of global variables for builtin hash and equal algorithms. 2017-06-04 22:11:28 +00:00
llvm [DebugInfo] Add DILabel metadata and intrinsic llvm.dbg.label. 2018-05-09 02:40:45 +00:00
openmp [OMPT] Fix thread_num for implicit_task_end callbacks in nested parallel regions 2018-05-07 12:42:21 +00:00
parallel-libs [Axccel] Remove -Wno-missing-braces in build 2016-12-19 21:34:07 +00:00
polly [test] Replace undef with true/false to make test case less fragile 2018-05-08 07:24:05 +00:00
README.md Add an svn project to contain the files that appear at the root of the 2017-10-19 21:09:49 +00:00

README.md

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.