[all-commits] [llvm/llvm-project] 284c1a: [LLDB] Enable SBTypeSynthetic manipulation for SBV...

[David Mentler via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 284c1a166af4c7deab55c7de2ee1bd480d44e9ff
      https://github.com/llvm/llvm-project/commit/284c1a166af4c7deab55c7de2ee1bd480d44e9ff
  Author: David Mentler <mentlerd at gmail.com>
  Date:   2026-07-17 (Fri, 17 Jul 2026)

  Changed paths:
    M lldb/docs/use/variable.md
    M lldb/include/lldb/API/SBValue.h
    M lldb/include/lldb/DataFormatters/TypeSynthetic.h
    M lldb/include/lldb/ValueObject/ValueObject.h
    M lldb/include/lldb/ValueObject/ValueObjectSynthetic.h
    M lldb/source/API/SBValue.cpp
    M lldb/source/DataFormatters/TypeSynthetic.cpp
    M lldb/source/ValueObject/ValueObject.cpp
    M lldb/source/ValueObject/ValueObjectSynthetic.cpp
    A lldb/test/API/python_api/sbvalue_set_type_synthetic/Makefile
    A lldb/test/API/python_api/sbvalue_set_type_synthetic/TestSBValueSetTypeSynthetic.py
    A lldb/test/API/python_api/sbvalue_set_type_synthetic/library_support.py
    A lldb/test/API/python_api/sbvalue_set_type_synthetic/main.cpp
    A lldb/test/API/python_api/sbvalue_set_type_synthetic_override/Makefile
    A lldb/test/API/python_api/sbvalue_set_type_synthetic_override/TestSBValueSetTypeSyntheticOverride.py
    A lldb/test/API/python_api/sbvalue_set_type_synthetic_override/foo_bar_synths.py
    A lldb/test/API/python_api/sbvalue_set_type_synthetic_override/main.cpp

  Log Message:
  -----------
  [LLDB] Enable SBTypeSynthetic manipulation for SBValue instances (#209056)

Allow manipulating the scripted synthetic children frontend selection
process for individual `SBValue` instances.

The motivating use-case is supporting custom data structures, type
erasure systems, and facilitating debugging handle based C APIs. Below
is an example of such a use-case of an anonymized 3rd party C library:
```C
using ErrorCode = int;
using Handle = void*;

using FooHandle = Handle;
using BarHandle = Handle;

struct ArrayOfHandles {
  int size;
  Handle* data;
};

struct AllHandles {
  ArrayOfHandles foos; 
  ArrayOfHandles bars;
};

ErrorCode GetAllHandles(AllHandles* into);
```

The current LLDB feature-set allows attaching a synthetic children
provider to `AllHandles`, but the scripted frontend has no chance to
select an appropriate alternative frontend implementation class for
`foos` and `bars` based on type information it is aware of.



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