🍒[lldb] Add filter option to AST dump command #10775
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…stream (llvm#142163) We're planning on using the ASTPrinter in LLDB for AST dumping. But it currently takes the output stream via `unique_ptr`. In LLDB we don't have the output stream available in this form and instead it would be convenient if we could just pass a reference to the stream. This patch adds that overload. (cherry picked from commit 41d6343)
Depends on llvm#142163 This patch makes the `-ast-dump-filter` Clang option available to the `target modules dump ast` command. This allows us to selectively dump parts of the AST by name. The AST can quickly grow way too large to skim on the console. This will aid in debugging AST related issues. Example: ``` (lldb) target modules dump ast --filter func Dumping clang ast for 48 modules. Dumping func: FunctionDecl 0xc4b785008 <<invalid sloc>> <invalid sloc> func 'void (int)' extern |-ParmVarDecl 0xc4b7853d8 <<invalid sloc>> <invalid sloc> x 'int' `-AsmLabelAttr 0xc4b785358 <<invalid sloc>> Implicit "_Z4funcIiEvT_" Dumping func<int>: FunctionDecl 0xc4b7850b8 <<invalid sloc>> <invalid sloc> func<int> 'void (int)' implicit_instantiation extern |-TemplateArgument type 'int' | `-BuiltinType 0xc4b85b110 'int' `-ParmVarDecl 0xc4b7853d8 <<invalid sloc>> <invalid sloc> x 'int' ``` The majority of this patch is adjust the `Dump` API. The main change in behaviour is in `TypeSystemClang::Dump`, where we now use the `ASTPrinter` for dumping the `TranslationUnitDecl`. This is where the `-ast-dump-filter` functionality lives in Clang. (cherry picked from commit 0f7e10b)
adrian-prantl
approved these changes
Jun 2, 2025
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This patch makes the
-ast-dump-filterClang option available to thetarget modules dump astcommand. This allows us to selectively dumpparts of the AST by name.
The AST can quickly grow way too large to skim on the console. This will
aid in debugging AST related issues.
Example:
The majority of this patch is adjust the
DumpAPI. The main change inbehaviour is in
TypeSystemClang::Dump, where we now use theASTPrinterfor dumping theTranslationUnitDecl. This is where the-ast-dump-filterfunctionality lives in Clang.(cherry picked from commit 0f7e10b)