[all-commits] [llvm/llvm-project] 4e3440: [CIR] Upstream a basic version of class LexicalSco...

[David Olsen via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 4e3440d9dd181f83ac1aa23f9c458d1344413e98
      https://github.com/llvm/llvm-project/commit/4e3440d9dd181f83ac1aa23f9c458d1344413e98
  Author: David Olsen <dolsen at nvidia.com>
  Date:   2025-03-19 (Wed, 19 Mar 2025)

  Changed paths:
    M clang/include/clang/CIR/Dialect/IR/CIROps.td
    M clang/include/clang/CIR/MissingFeatures.h
    M clang/lib/CIR/CodeGen/CIRGenFunction.cpp
    M clang/lib/CIR/CodeGen/CIRGenFunction.h
    M clang/lib/CIR/CodeGen/CIRGenStmt.cpp
    M clang/test/CIR/CodeGen/basic.c
    M clang/test/CIR/CodeGen/basic.cpp
    M clang/test/CIR/CodeGen/cast.cpp
    M clang/test/CIR/CodeGen/unary.cpp
    M clang/test/CIR/Lowering/basic.cpp
    M clang/test/CIR/Lowering/func-simple.cpp
    M clang/test/CIR/func-simple.cpp

  Log Message:
  -----------
  [CIR] Upstream a basic version of class LexicalScope (#131945)

Upstream the parts of class `CIRGenFunction::LexicalScope` that
implement function return values. There is a bit of other functionality
in here, such as the implicit `cir.yield` at the end of a non-function
scope, but this is mostly about function returns.

The parts of `LexicalScope` that handle calling destructors, switch
statements, ternary expressions, and exception handling still need to be
upstreamed.

There is a change in the generated ClangIR (which is why many of the
tests needed updating). Return values are stored in the
compiler-generated variable `__retval` rather than being passed to the
`cir.return` op directly. But there should be no change in the behavior
of the generated code.



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