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Added the DWARF unique type map such that we only create a type once in the 

module's AST context. Prior to this fix, with gcc binaries, we end up with
a full class definition for any used classes in each compile unit due to the
one definition rule. This would result in us making N copies of class T, where
N is the number of compile units that use class T, in the module AST. When
an expression would then try and use any types that were duplicated, it would
quickly confuse clang and make expression evaluation fail due to all of the
duplicate types that got copied over. This is now fixed by making a map of
types in the DWARF that maps type names to a collection of types + declaration
(file + line number) + DIE. Then later when we find a type we look in this
module map and find any already cached types that we can just use.

8935777

llvm-svn: 125207
This commit is contained in:
Greg Clayton 2011-02-09 19:06:17 +00:00
parent 1388a89999
commit 1c9e5acd27
4 changed files with 130 additions and 139 deletions
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10
lldb/include/lldb/Symbol/UnwindPlan.h
View File

@ -205,15 +205,19 @@ public:
public:
UnwindPlan () :
m_register_kind(-1),
m_row_list (),
m_plan_valid_address_range (),
m_register_kind (UINT32_MAX),
m_source_name ()
{
m_plan_valid_address_range.SetByteSize (0);
}
void Dump (Stream& s, Thread* thread) const;
~UnwindPlan ()
{
}
void
Dump (Stream& s, Thread* thread) const;
void
AppendRow (const Row& row);

1
lldb/source/Plugins/Process/Utility/UnwindAssemblyProfiler-x86.cpp
View File

@ -519,7 +519,6 @@ AssemblyParse_x86::instruction_length (Address addr, int &length)
bool
AssemblyParse_x86::get_non_call_site_unwind_plan (UnwindPlan &unwind_plan)
{
UnwindPlan up;
UnwindPlan::Row row;
int non_prologue_insn_count = 0;
m_cur_insn = m_func_bounds.GetBaseAddress ();

70
lldb/source/Plugins/SymbolFile/DWARF/SymbolFileDWARF.cpp
View File

@ -179,8 +179,8 @@ SymbolFileDWARF::SymbolFileDWARF(ObjectFile* objfile) :
m_namespace_index(),
m_indexed (false),
m_is_external_ast_source (false),
m_ranges()//,
//m_unique_ast_type_map ()
m_ranges(),
m_unique_ast_type_map ()
{
}
@ -3169,30 +3169,28 @@ SymbolFileDWARF::ParseType (const SymbolContext& sc, DWARFCompileUnit* dwarf_cu,
}
}
// UniqueDWARFASTType unique_ast_entry;
// if (decl.IsValid())
// {
// if (m_unique_ast_type_map.Find (type_name_const_str,
// die,
// decl,
// unique_ast_entry))
// {
// // We have already parsed this type or from another
// // compile unit. GCC loves to use the "one definition
// // rule" which can result in multiple definitions
// // of the same class over and over in each compile
// // unit.
// type_sp = unique_ast_entry.m_type_sp;
// }
// }
//
// if (type_sp)
// {
// m_die_to_type[die] = type_sp.get();
//
// }
// else
UniqueDWARFASTType unique_ast_entry;
if (decl.IsValid())
{
if (m_unique_ast_type_map.Find (type_name_const_str,
die,
decl,
unique_ast_entry))
{
// We have already parsed this type or from another
// compile unit. GCC loves to use the "one definition
// rule" which can result in multiple definitions
// of the same class over and over in each compile
// unit.
type_sp = unique_ast_entry.m_type_sp;
if (type_sp)
{
m_die_to_type[die] = type_sp.get();
return type_sp;
}
}
}
DEBUG_PRINTF ("0x%8.8x: %s (\"%s\")\n", die->GetOffset(), DW_TAG_value_to_name(tag), type_name_cstr);
int tag_decl_kind = -1;
@ -3268,16 +3266,15 @@ SymbolFileDWARF::ParseType (const SymbolContext& sc, DWARFCompileUnit* dwarf_cu,
clang_type,
Type::eResolveStateForward));
m_die_to_type[die] = type_sp.get();
// Add our type to the unique type map so we don't
// end up creating many copies of the same type over
// and over in the ASTContext for our module
// unique_ast_entry.m_type_sp = type_sp;
// unique_ast_entry.m_die = die;
// unique_ast_entry.m_declaration = decl;
// m_unique_ast_type_map.Insert (type_name_const_str,
// unique_ast_entry);
unique_ast_entry.m_type_sp = type_sp;
unique_ast_entry.m_die = die;
unique_ast_entry.m_declaration = decl;
m_unique_ast_type_map.Insert (type_name_const_str,
unique_ast_entry);
if (die->HasChildren() == false && is_forward_declaration == false)
{
@ -3297,7 +3294,6 @@ SymbolFileDWARF::ParseType (const SymbolContext& sc, DWARFCompileUnit* dwarf_cu,
ClangASTContext::SetHasExternalStorage (clang_type, true);
}
}
}
break;
case DW_TAG_enumeration_type:
@ -3381,8 +3377,6 @@ SymbolFileDWARF::ParseType (const SymbolContext& sc, DWARFCompileUnit* dwarf_cu,
clang_type,
Type::eResolveStateForward));
m_die_to_type[die] = type_sp.get();
#if LEAVE_ENUMS_FORWARD_DECLARED
// Leave this as a forward declaration until we need
// to know the details of the type. lldb_private::Type
@ -3653,8 +3647,6 @@ SymbolFileDWARF::ParseType (const SymbolContext& sc, DWARFCompileUnit* dwarf_cu,
&decl,
clang_type,
Type::eResolveStateFull));
m_die_to_type[die] = type_sp.get();
assert(type_sp.get());
}
break;
@ -3749,7 +3741,6 @@ SymbolFileDWARF::ParseType (const SymbolContext& sc, DWARFCompileUnit* dwarf_cu,
clang_type,
Type::eResolveStateFull));
type_sp->SetEncodingType (element_type);
m_die_to_type[die] = type_sp.get();
}
}
}
@ -3802,7 +3793,6 @@ SymbolFileDWARF::ParseType (const SymbolContext& sc, DWARFCompileUnit* dwarf_cu,
NULL,
clang_type,
Type::eResolveStateForward));
m_die_to_type[die] = type_sp.get();
}
break;
@ -3841,15 +3831,13 @@ SymbolFileDWARF::ParseType (const SymbolContext& sc, DWARFCompileUnit* dwarf_cu,
// type_sp->SetUserDefinedType(udt_sp);
// }
if (type_sp.unique())
{
//printf ("Adding type to map: 0x%8.8x for %s\n", die->GetOffset(), type_sp->GetName().GetCString());
// We are ready to put this type into the uniqued list up at the module level
type_list->Insert (type_sp);
m_die_to_type[die] = type_sp.get();
}
}
}
else if (type_ptr != DIE_IS_BEING_PARSED)
{
type_sp = type_list->FindType(type_ptr->GetID());

4
lldb/source/Plugins/SymbolFile/DWARF/SymbolFileDWARF.h
View File

@ -32,7 +32,7 @@
// Project includes
#include "DWARFDefines.h"
#include "NameToDIE.h"
//#include "UniqueDWARFASTType.h"
#include "UniqueDWARFASTType.h"
//----------------------------------------------------------------------
@ -351,7 +351,7 @@ protected:
m_is_external_ast_source:1;
std::auto_ptr<DWARFDebugRanges> m_ranges;
// UniqueDWARFASTTypeMap m_unique_ast_type_map;
UniqueDWARFASTTypeMap m_unique_ast_type_map;
typedef llvm::DenseMap<const DWARFDebugInfoEntry *, clang::DeclContext *> DIEToDeclContextMap;
typedef llvm::DenseMap<const DWARFDebugInfoEntry *, lldb_private::Type *> DIEToTypePtr;
typedef llvm::DenseMap<const DWARFDebugInfoEntry *, lldb::VariableSP> DIEToVariableSP;