[PATCH] D72055: [DebugInfo] Support for DW_OP_implicit_pointer (for temp references & dynamic allocations)

[Alok Kumar Sharma via Phabricator via llvm-commits]

alok created this revision.
alok added reviewers: aprantl, probinson, dblaikie, jmorse, jini.susan.george, SouraVX, awpandey.
alok added projects: LLVM, debug-info.
Herald added subscribers: llvm-commits, hiraditya.

This is a POC patch. Before review, it needs more maturity.

This patch (10/N) stems from D69787 <https://reviews.llvm.org/D69787>

This enables debugger (using DW_OP_implicit_pointer) to display de-referenced value of pointer in case temporary is optimized out. It happens in case of reference or dynamic allocation.

  Testing:

-Added unit test for validation thru llvm IR
-check-llvm (LLDB need to be modifed to support this)
-check-debuginfo (the debug info integration tests)


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D72055

Files:
  llvm/lib/IR/Instruction.cpp
  llvm/lib/Transforms/InstCombine/InstructionCombining.cpp
  llvm/test/DebugInfo/implicit_pointer_temp_dyn_alloc.cc
  llvm/test/DebugInfo/implicit_pointer_temp_reference.cc

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