Vedant Kumar 0f83e1fc48 [Local] replaceAllDbgUsesWith: Update debug values before RAUW ...

The replaceAllDbgUsesWith utility helps passes preserve debug info when
replacing one value with another.

This improves upon the existing insertReplacementDbgValues API by:

- Updating debug intrinsics in-place, while preventing use-before-def of
  the replacement value.
- Falling back to salvageDebugInfo when a replacement can't be made.
- Moving the responsibiliy for rewriting llvm.dbg.* DIExpressions into
  common utility code.

Along with the API change, this teaches replaceAllDbgUsesWith how to
create DIExpressions for three basic integer and pointer conversions:

- The no-op conversion. Applies when the values have the same width, or
  have bit-for-bit compatible pointer representations.
- Truncation. Applies when the new value is wider than the old one.
- Zero/sign extension. Applies when the new value is narrower than the
  old one.

Testing:

- check-llvm, check-clang, a stage2 `-g -O3` build of clang,
  regression/unit testing.
- This resolves a number of mis-sized dbg.value diagnostics from
  Debugify.

Differential Revision: https://reviews.llvm.org/D48676

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@336451 91177308-0d34-0410-b5e6-96231b3b80d8

2018-07-06 17:32:39 +00:00

..

ASanStackFrameLayoutTest.cpp

[asan] Add a full redzone after every stack variable

2017-11-18 01:13:18 +00:00

BasicBlockUtils.cpp

Revert "Simplify blockaddress usage before giving up in MergeBlockIntoPredecessor"

2018-06-18 23:20:08 +00:00

Cloning.cpp

[CloneFunction] Support BB == PredBB in DuplicateInstructionsInSplit.

2018-03-06 13:12:32 +00:00

CMakeLists.txt

[PR16756] Add SSAUpdaterBulk.

2018-04-09 23:37:20 +00:00

CodeExtractor.cpp

[CodeExtractor] Fix multiple bugs under certain shape of extracted region

2017-10-06 03:37:06 +00:00

FunctionComparator.cpp

Re-sort #include lines for unittests. This uses a slightly modified

2017-06-06 11:06:56 +00:00

IntegerDivision.cpp

Remove getArgumentList() in favor of arg_begin(), args(), etc

2017-03-16 22:59:15 +00:00

Local.cpp

[Local] replaceAllDbgUsesWith: Update debug values before RAUW

2018-07-06 17:32:39 +00:00

OrderedInstructions.cpp

Add a dominanance check interface that uses caching for instructions within same basic block.

2017-06-06 02:34:41 +00:00

SSAUpdaterBulk.cpp

Revert "Revert r330403 and r330413."

2018-04-20 13:34:32 +00:00

ValueMapperTest.cpp

Re-sort #include lines for unittests. This uses a slightly modified

2017-06-06 11:06:56 +00:00