Author: Pavel Labath Date: 2024-06-11T19:49:10+02:00 New Revision: 56f668c12b1a26e103aafe5ac37930b1895c938b
URL: https://github.com/llvm/llvm-project/commit/56f668c12b1a26e103aafe5ac37930b1895c938b DIFF: https://github.com/llvm/llvm-project/commit/56f668c12b1a26e103aafe5ac37930b1895c938b.diff LOG: [lldb/DWARF] Remove some dead code (#95127) `GetDeclContextDIEs` and `DIEDeclContextsMatch` are unused (possibly since we added support for simplified template names, but I haven't checked). `GetDeclContextDIEs` is also very similar (but subtly different) from `GetDeclContext` and `GetTypeLookupContext`. I am keeping `GetParentDeclContextDIE` as that one still has some callers, but I want to look into the possibility of merging it with at least one of the functions mentioned above. Added: Modified: lldb/source/Plugins/SymbolFile/DWARF/DWARFDIE.cpp lldb/source/Plugins/SymbolFile/DWARF/DWARFDIE.h lldb/source/Plugins/SymbolFile/DWARF/SymbolFileDWARF.cpp lldb/source/Plugins/SymbolFile/DWARF/SymbolFileDWARF.h Removed: ################################################################################ diff --git a/lldb/source/Plugins/SymbolFile/DWARF/DWARFDIE.cpp b/lldb/source/Plugins/SymbolFile/DWARF/DWARFDIE.cpp index 7cf92adc6ef57..0ef94ed9f17c3 100644 --- a/lldb/source/Plugins/SymbolFile/DWARF/DWARFDIE.cpp +++ b/lldb/source/Plugins/SymbolFile/DWARF/DWARFDIE.cpp @@ -367,20 +367,6 @@ lldb_private::Type *DWARFDIE::ResolveTypeUID(const DWARFDIE &die) const { return nullptr; } -std::vector<DWARFDIE> DWARFDIE::GetDeclContextDIEs() const { - if (!IsValid()) - return {}; - - std::vector<DWARFDIE> result; - DWARFDIE parent = GetParentDeclContextDIE(); - while (parent.IsValid() && parent.GetDIE() != GetDIE()) { - result.push_back(std::move(parent)); - parent = parent.GetParentDeclContextDIE(); - } - - return result; -} - static void GetDeclContextImpl(DWARFDIE die, llvm::SmallSet<lldb::user_id_t, 4> &seen, std::vector<CompilerContext> &context) { diff --git a/lldb/source/Plugins/SymbolFile/DWARF/DWARFDIE.h b/lldb/source/Plugins/SymbolFile/DWARF/DWARFDIE.h index 511ca62d0197a..c74a82061fccf 100644 --- a/lldb/source/Plugins/SymbolFile/DWARF/DWARFDIE.h +++ b/lldb/source/Plugins/SymbolFile/DWARF/DWARFDIE.h @@ -69,9 +69,6 @@ class DWARFDIE : public DWARFBaseDIE { DWARFDIE GetParentDeclContextDIE() const; - // DeclContext related functions - std::vector<DWARFDIE> GetDeclContextDIEs() const; - /// Return this DIE's decl context as it is needed to look up types /// in Clang modules. This context will include any modules or functions that /// the type is declared in so an exact module match can be efficiently made. diff --git a/lldb/source/Plugins/SymbolFile/DWARF/SymbolFileDWARF.cpp b/lldb/source/Plugins/SymbolFile/DWARF/SymbolFileDWARF.cpp index a52a7d6767374..d9e81f9c105b2 100644 --- a/lldb/source/Plugins/SymbolFile/DWARF/SymbolFileDWARF.cpp +++ b/lldb/source/Plugins/SymbolFile/DWARF/SymbolFileDWARF.cpp @@ -3039,95 +3039,6 @@ TypeSP SymbolFileDWARF::FindCompleteObjCDefinitionTypeForDIE( return type_sp; } -// This function helps to ensure that the declaration contexts match for two -// diff erent DIEs. Often times debug information will refer to a forward -// declaration of a type (the equivalent of "struct my_struct;". There will -// often be a declaration of that type elsewhere that has the full definition. -// When we go looking for the full type "my_struct", we will find one or more -// matches in the accelerator tables and we will then need to make sure the -// type was in the same declaration context as the original DIE. This function -// can efficiently compare two DIEs and will return true when the declaration -// context matches, and false when they don't. -bool SymbolFileDWARF::DIEDeclContextsMatch(const DWARFDIE &die1, - const DWARFDIE &die2) { - if (die1 == die2) - return true; - - std::vector<DWARFDIE> decl_ctx_1; - std::vector<DWARFDIE> decl_ctx_2; - // The declaration DIE stack is a stack of the declaration context DIEs all - // the way back to the compile unit. If a type "T" is declared inside a class - // "B", and class "B" is declared inside a class "A" and class "A" is in a - // namespace "lldb", and the namespace is in a compile unit, there will be a - // stack of DIEs: - // - // [0] DW_TAG_class_type for "B" - // [1] DW_TAG_class_type for "A" - // [2] DW_TAG_namespace for "lldb" - // [3] DW_TAG_compile_unit or DW_TAG_partial_unit for the source file. - // - // We grab both contexts and make sure that everything matches all the way - // back to the compiler unit. - - // First lets grab the decl contexts for both DIEs - decl_ctx_1 = die1.GetDeclContextDIEs(); - decl_ctx_2 = die2.GetDeclContextDIEs(); - // Make sure the context arrays have the same size, otherwise we are done - const size_t count1 = decl_ctx_1.size(); - const size_t count2 = decl_ctx_2.size(); - if (count1 != count2) - return false; - - // Make sure the DW_TAG values match all the way back up the compile unit. If - // they don't, then we are done. - DWARFDIE decl_ctx_die1; - DWARFDIE decl_ctx_die2; - size_t i; - for (i = 0; i < count1; i++) { - decl_ctx_die1 = decl_ctx_1[i]; - decl_ctx_die2 = decl_ctx_2[i]; - if (decl_ctx_die1.Tag() != decl_ctx_die2.Tag()) - return false; - } -#ifndef NDEBUG - - // Make sure the top item in the decl context die array is always - // DW_TAG_compile_unit or DW_TAG_partial_unit. If it isn't then - // something went wrong in the DWARFDIE::GetDeclContextDIEs() - // function. - dw_tag_t cu_tag = decl_ctx_1[count1 - 1].Tag(); - UNUSED_IF_ASSERT_DISABLED(cu_tag); - assert(cu_tag == DW_TAG_compile_unit || cu_tag == DW_TAG_partial_unit); - -#endif - // Always skip the compile unit when comparing by only iterating up to "count - // - 1". Here we compare the names as we go. - for (i = 0; i < count1 - 1; i++) { - decl_ctx_die1 = decl_ctx_1[i]; - decl_ctx_die2 = decl_ctx_2[i]; - const char *name1 = decl_ctx_die1.GetName(); - const char *name2 = decl_ctx_die2.GetName(); - // If the string was from a DW_FORM_strp, then the pointer will often be - // the same! - if (name1 == name2) - continue; - - // Name pointers are not equal, so only compare the strings if both are not - // NULL. - if (name1 && name2) { - // If the strings don't compare, we are done... - if (strcmp(name1, name2) != 0) - return false; - } else { - // One name was NULL while the other wasn't - return false; - } - } - // We made it through all of the checks and the declaration contexts are - // equal. - return true; -} - TypeSP SymbolFileDWARF::FindDefinitionTypeForDWARFDeclContext(const DWARFDIE &die) { TypeSP type_sp; diff --git a/lldb/source/Plugins/SymbolFile/DWARF/SymbolFileDWARF.h b/lldb/source/Plugins/SymbolFile/DWARF/SymbolFileDWARF.h index 7282c08c6857c..5d3654efcce54 100644 --- a/lldb/source/Plugins/SymbolFile/DWARF/SymbolFileDWARF.h +++ b/lldb/source/Plugins/SymbolFile/DWARF/SymbolFileDWARF.h @@ -461,8 +461,6 @@ class SymbolFileDWARF : public SymbolFileCommon { FindBlockContainingSpecification(const DWARFDIE &die, dw_offset_t spec_block_die_offset); - bool DIEDeclContextsMatch(const DWARFDIE &die1, const DWARFDIE &die2); - bool ClassContainsSelector(const DWARFDIE &class_die, ConstString selector); /// Parse call site entries (DW_TAG_call_site), including any nested call site _______________________________________________ lldb-commits mailing list lldb-commits@lists.llvm.org https://lists.llvm.org/cgi-bin/mailman/listinfo/lldb-commits
