[Lldb-commits] [PATCH] D156774: [lldb][DWARFASTParserClang] Resolve nested types when parsing structures

[Vlad Serebrennikov via Phabricator via lldb-commits]

Endill added a comment.

I tested this patch together with the following new code:

  uint32_t TypeSystemClang::GetNumMemberEnums(lldb::opaque_compiler_type_t 
type) {
    using EnumIt = clang::DeclContext::specific_decl_iterator<clang::EnumDecl>;
    if (!type)
      return 0;
    clang::QualType qual_type = RemoveWrappingTypes(GetCanonicalQualType(type));
    clang::DeclContext *ctx = qual_type->getAsRecordDecl()->getDeclContext();
    return std::distance(EnumIt(ctx->decls_begin()), EnumIt(ctx->decls_end()));
  }
  
  CompilerType
  TypeSystemClang::GetMemberEnumAtIndex(lldb::opaque_compiler_type_t type,
                                        size_t index) {
    using EnumIt = clang::DeclContext::specific_decl_iterator<clang::EnumDecl>;
    if (!type)
      return CompilerType();
  
    clang::QualType qual_type = RemoveWrappingTypes(GetCanonicalQualType(type));
    clang::DeclContext *ctx = qual_type->getAsRecordDecl()->getDeclContext();
    size_t enum_index = 0;
    for (EnumIt enums_it(ctx->decls_begin()), enums_end(ctx->decls_end());
         enums_it != enums_end;
         ++enums_it, ++enum_index) {
        if (enum_index == index) {
          return CompilerType(weak_from_this(), *enums_it);
        }
    }
  }

I created all the wrappers to make it available in Python. The result was 
unsatisfactory: this code doesn't even trigger 
`DWARFASTParserClang::ParseChildMembers` that this patch touches, and return 0 
instead of 1. This doesn't change even if I trigger `ParseChildMembers` via 
other means before asking for a number of member enums in a type.

Code I tested this on:

  using intptr_t = long;
  using uintptr_t = unsigned long;
  
  struct PointerIntPairInfo {
    enum MaskAndShiftConstants : uintptr_t {
      PointerBitMask =
          ~(uintptr_t)(((intptr_t)1 << 3) - 1),
    };
  
    int a{};
  };
  
  static uintptr_t dummy() {
    return PointerIntPairInfo::PointerBitMask;
  }
  
  int main()
  {
      PointerIntPairInfo p;
      __builtin_debugtrap();
      return p.a + foo();
  }

If you have any suggestions what I missed or did wrong, please let me know.

I'll continue with this patch nevertheless, but it's clear now that there's 
still a way to go until I can access that enum without going through slow 
expression evaluator.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D156774/new/

https://reviews.llvm.org/D156774

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