2010-06-09 00:52:24 +08:00
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//===-- SymbolFile.cpp ------------------------------------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#include "lldb/Symbol/SymbolFile.h"
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2011-11-28 09:45:00 +08:00
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#include "lldb/lldb-private.h"
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#include "lldb/Core/Log.h"
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2010-11-10 12:57:04 +08:00
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#include "lldb/Core/Module.h"
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2010-06-09 00:52:24 +08:00
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#include "lldb/Core/PluginManager.h"
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2011-11-28 09:45:00 +08:00
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#include "lldb/Core/StreamString.h"
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2010-11-10 12:57:04 +08:00
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#include "lldb/Symbol/ObjectFile.h"
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2010-06-09 00:52:24 +08:00
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using namespace lldb_private;
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SymbolFile*
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SymbolFile::FindPlugin (ObjectFile* obj_file)
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{
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2013-04-19 06:45:39 +08:00
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std::unique_ptr<SymbolFile> best_symfile_ap;
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2014-04-20 21:17:36 +08:00
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if (obj_file != nullptr)
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2010-06-09 00:52:24 +08:00
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{
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2013-07-10 09:23:25 +08:00
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// We need to test the abilities of this section list. So create what it would
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// be with this new obj_file.
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lldb::ModuleSP module_sp(obj_file->GetModule());
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if (module_sp)
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{
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// Default to the main module section list.
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ObjectFile *module_obj_file = module_sp->GetObjectFile();
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if (module_obj_file != obj_file)
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{
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// Make sure the main object file's sections are created
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module_obj_file->GetSectionList();
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obj_file->CreateSections (*module_sp->GetUnifiedSectionList());
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}
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}
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2010-06-09 00:52:24 +08:00
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// TODO: Load any plug-ins in the appropriate plug-in search paths and
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// iterate over all of them to find the best one for the job.
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uint32_t best_symfile_abilities = 0;
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SymbolFileCreateInstance create_callback;
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2014-04-20 21:17:36 +08:00
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for (uint32_t idx = 0; (create_callback = PluginManager::GetSymbolFileCreateCallbackAtIndex(idx)) != nullptr; ++idx)
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2010-06-09 00:52:24 +08:00
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{
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2013-04-19 06:45:39 +08:00
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std::unique_ptr<SymbolFile> curr_symfile_ap(create_callback(obj_file));
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2010-06-09 00:52:24 +08:00
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if (curr_symfile_ap.get())
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{
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2012-04-27 00:53:42 +08:00
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const uint32_t sym_file_abilities = curr_symfile_ap->GetAbilities();
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2010-06-09 00:52:24 +08:00
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if (sym_file_abilities > best_symfile_abilities)
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{
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best_symfile_abilities = sym_file_abilities;
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2013-04-19 02:10:51 +08:00
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best_symfile_ap.reset (curr_symfile_ap.release());
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2012-04-27 00:53:42 +08:00
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// If any symbol file parser has all of the abilities, then
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// we should just stop looking.
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if ((kAllAbilities & sym_file_abilities) == kAllAbilities)
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break;
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2010-06-09 00:52:24 +08:00
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}
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}
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}
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A few of the issue I have been trying to track down and fix have been due to
the way LLDB lazily gets complete definitions for types within the debug info.
When we run across a class/struct/union definition in the DWARF, we will only
parse the full definition if we need to. This works fine for top level types
that are assigned directly to variables and arguments, but when we have a
variable with a class, lets say "A" for this example, that has a member:
"B *m_b". Initially we don't need to hunt down a definition for this class
unless we are ever asked to do something with it ("expr m_b->getDecl()" for
example). With my previous approach to lazy type completion, we would be able
to take a "A *a" and get a complete type for it, but we wouldn't be able to
then do an "a->m_b->getDecl()" unless we always expanded all types within a
class prior to handing out the type. Expanding everything is very costly and
it would be great if there were a better way.
A few months ago I worked with the llvm/clang folks to have the
ExternalASTSource class be able to complete classes if there weren't completed
yet:
class ExternalASTSource {
....
virtual void
CompleteType (clang::TagDecl *Tag);
virtual void
CompleteType (clang::ObjCInterfaceDecl *Class);
};
This was great, because we can now have the class that is producing the AST
(SymbolFileDWARF and SymbolFileDWARFDebugMap) sign up as external AST sources
and the object that creates the forward declaration types can now also
complete them anywhere within the clang type system.
This patch makes a few major changes:
- lldb_private::Module classes now own the AST context. Previously the TypeList
objects did.
- The DWARF parsers now sign up as an external AST sources so they can complete
types.
- All of the pure clang type system wrapper code we have in LLDB (ClangASTContext,
ClangASTType, and more) can now be iterating through children of any type,
and if a class/union/struct type (clang::RecordType or ObjC interface)
is found that is incomplete, we can ask the AST to get the definition.
- The SymbolFileDWARFDebugMap class now will create and use a single AST that
all child SymbolFileDWARF classes will share (much like what happens when
we have a complete linked DWARF for an executable).
We will need to modify some of the ClangUserExpression code to take more
advantage of this completion ability in the near future. Meanwhile we should
be better off now that we can be accessing any children of variables through
pointers and always be able to resolve the clang type if needed.
llvm-svn: 123613
2011-01-17 11:46:26 +08:00
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if (best_symfile_ap.get())
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{
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// Let the winning symbol file parser initialize itself more
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// completely now that it has been chosen
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best_symfile_ap->InitializeObject();
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}
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2010-06-09 00:52:24 +08:00
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}
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A few of the issue I have been trying to track down and fix have been due to
the way LLDB lazily gets complete definitions for types within the debug info.
When we run across a class/struct/union definition in the DWARF, we will only
parse the full definition if we need to. This works fine for top level types
that are assigned directly to variables and arguments, but when we have a
variable with a class, lets say "A" for this example, that has a member:
"B *m_b". Initially we don't need to hunt down a definition for this class
unless we are ever asked to do something with it ("expr m_b->getDecl()" for
example). With my previous approach to lazy type completion, we would be able
to take a "A *a" and get a complete type for it, but we wouldn't be able to
then do an "a->m_b->getDecl()" unless we always expanded all types within a
class prior to handing out the type. Expanding everything is very costly and
it would be great if there were a better way.
A few months ago I worked with the llvm/clang folks to have the
ExternalASTSource class be able to complete classes if there weren't completed
yet:
class ExternalASTSource {
....
virtual void
CompleteType (clang::TagDecl *Tag);
virtual void
CompleteType (clang::ObjCInterfaceDecl *Class);
};
This was great, because we can now have the class that is producing the AST
(SymbolFileDWARF and SymbolFileDWARFDebugMap) sign up as external AST sources
and the object that creates the forward declaration types can now also
complete them anywhere within the clang type system.
This patch makes a few major changes:
- lldb_private::Module classes now own the AST context. Previously the TypeList
objects did.
- The DWARF parsers now sign up as an external AST sources so they can complete
types.
- All of the pure clang type system wrapper code we have in LLDB (ClangASTContext,
ClangASTType, and more) can now be iterating through children of any type,
and if a class/union/struct type (clang::RecordType or ObjC interface)
is found that is incomplete, we can ask the AST to get the definition.
- The SymbolFileDWARFDebugMap class now will create and use a single AST that
all child SymbolFileDWARF classes will share (much like what happens when
we have a complete linked DWARF for an executable).
We will need to modify some of the ClangUserExpression code to take more
advantage of this completion ability in the near future. Meanwhile we should
be better off now that we can be accessing any children of variables through
pointers and always be able to resolve the clang type if needed.
llvm-svn: 123613
2011-01-17 11:46:26 +08:00
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return best_symfile_ap.release();
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2010-06-09 00:52:24 +08:00
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}
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2010-11-10 12:57:04 +08:00
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TypeList *
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SymbolFile::GetTypeList ()
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{
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A few of the issue I have been trying to track down and fix have been due to
the way LLDB lazily gets complete definitions for types within the debug info.
When we run across a class/struct/union definition in the DWARF, we will only
parse the full definition if we need to. This works fine for top level types
that are assigned directly to variables and arguments, but when we have a
variable with a class, lets say "A" for this example, that has a member:
"B *m_b". Initially we don't need to hunt down a definition for this class
unless we are ever asked to do something with it ("expr m_b->getDecl()" for
example). With my previous approach to lazy type completion, we would be able
to take a "A *a" and get a complete type for it, but we wouldn't be able to
then do an "a->m_b->getDecl()" unless we always expanded all types within a
class prior to handing out the type. Expanding everything is very costly and
it would be great if there were a better way.
A few months ago I worked with the llvm/clang folks to have the
ExternalASTSource class be able to complete classes if there weren't completed
yet:
class ExternalASTSource {
....
virtual void
CompleteType (clang::TagDecl *Tag);
virtual void
CompleteType (clang::ObjCInterfaceDecl *Class);
};
This was great, because we can now have the class that is producing the AST
(SymbolFileDWARF and SymbolFileDWARFDebugMap) sign up as external AST sources
and the object that creates the forward declaration types can now also
complete them anywhere within the clang type system.
This patch makes a few major changes:
- lldb_private::Module classes now own the AST context. Previously the TypeList
objects did.
- The DWARF parsers now sign up as an external AST sources so they can complete
types.
- All of the pure clang type system wrapper code we have in LLDB (ClangASTContext,
ClangASTType, and more) can now be iterating through children of any type,
and if a class/union/struct type (clang::RecordType or ObjC interface)
is found that is incomplete, we can ask the AST to get the definition.
- The SymbolFileDWARFDebugMap class now will create and use a single AST that
all child SymbolFileDWARF classes will share (much like what happens when
we have a complete linked DWARF for an executable).
We will need to modify some of the ClangUserExpression code to take more
advantage of this completion ability in the near future. Meanwhile we should
be better off now that we can be accessing any children of variables through
pointers and always be able to resolve the clang type if needed.
llvm-svn: 123613
2011-01-17 11:46:26 +08:00
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if (m_obj_file)
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return m_obj_file->GetModule()->GetTypeList();
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2014-04-20 21:17:36 +08:00
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return nullptr;
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A few of the issue I have been trying to track down and fix have been due to
the way LLDB lazily gets complete definitions for types within the debug info.
When we run across a class/struct/union definition in the DWARF, we will only
parse the full definition if we need to. This works fine for top level types
that are assigned directly to variables and arguments, but when we have a
variable with a class, lets say "A" for this example, that has a member:
"B *m_b". Initially we don't need to hunt down a definition for this class
unless we are ever asked to do something with it ("expr m_b->getDecl()" for
example). With my previous approach to lazy type completion, we would be able
to take a "A *a" and get a complete type for it, but we wouldn't be able to
then do an "a->m_b->getDecl()" unless we always expanded all types within a
class prior to handing out the type. Expanding everything is very costly and
it would be great if there were a better way.
A few months ago I worked with the llvm/clang folks to have the
ExternalASTSource class be able to complete classes if there weren't completed
yet:
class ExternalASTSource {
....
virtual void
CompleteType (clang::TagDecl *Tag);
virtual void
CompleteType (clang::ObjCInterfaceDecl *Class);
};
This was great, because we can now have the class that is producing the AST
(SymbolFileDWARF and SymbolFileDWARFDebugMap) sign up as external AST sources
and the object that creates the forward declaration types can now also
complete them anywhere within the clang type system.
This patch makes a few major changes:
- lldb_private::Module classes now own the AST context. Previously the TypeList
objects did.
- The DWARF parsers now sign up as an external AST sources so they can complete
types.
- All of the pure clang type system wrapper code we have in LLDB (ClangASTContext,
ClangASTType, and more) can now be iterating through children of any type,
and if a class/union/struct type (clang::RecordType or ObjC interface)
is found that is incomplete, we can ask the AST to get the definition.
- The SymbolFileDWARFDebugMap class now will create and use a single AST that
all child SymbolFileDWARF classes will share (much like what happens when
we have a complete linked DWARF for an executable).
We will need to modify some of the ClangUserExpression code to take more
advantage of this completion ability in the near future. Meanwhile we should
be better off now that we can be accessing any children of variables through
pointers and always be able to resolve the clang type if needed.
llvm-svn: 123613
2011-01-17 11:46:26 +08:00
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}
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lldb_private::ClangASTContext &
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SymbolFile::GetClangASTContext ()
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{
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return m_obj_file->GetModule()->GetClangASTContext();
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2010-11-10 12:57:04 +08:00
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}
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