2018-05-21 22:12:52 +08:00
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//===-- AppleDWARFIndex.h --------------------------------------*- C++ -*-===//
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//
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2019-01-19 16:50:56 +08:00
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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2018-05-21 22:12:52 +08:00
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLDB_APPLEDWARFINDEX_H
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#define LLDB_APPLEDWARFINDEX_H
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#include "Plugins/SymbolFile/DWARF/DWARFIndex.h"
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#include "Plugins/SymbolFile/DWARF/HashedNameToDIE.h"
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namespace lldb_private {
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class AppleDWARFIndex : public DWARFIndex {
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public:
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static std::unique_ptr<AppleDWARFIndex>
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Create(Module &module, DWARFDataExtractor apple_names,
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DWARFDataExtractor apple_namespaces, DWARFDataExtractor apple_types,
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DWARFDataExtractor apple_objc, DWARFDataExtractor debug_str);
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AppleDWARFIndex(
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Module &module, std::unique_ptr<DWARFMappedHash::MemoryTable> apple_names,
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std::unique_ptr<DWARFMappedHash::MemoryTable> apple_namespaces,
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std::unique_ptr<DWARFMappedHash::MemoryTable> apple_types,
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std::unique_ptr<DWARFMappedHash::MemoryTable> apple_objc)
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: DWARFIndex(module), m_apple_names_up(std::move(apple_names)),
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m_apple_namespaces_up(std::move(apple_namespaces)),
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m_apple_types_up(std::move(apple_types)),
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m_apple_objc_up(std::move(apple_objc)) {}
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void Preload() override {}
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2018-06-07 18:04:44 +08:00
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void GetGlobalVariables(ConstString basename, DIEArray &offsets) override;
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2018-05-21 22:12:52 +08:00
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void GetGlobalVariables(const RegularExpression ®ex,
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DIEArray &offsets) override;
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void GetGlobalVariables(const DWARFUnit &cu, DIEArray &offsets) override;
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void GetObjCMethods(ConstString class_name, DIEArray &offsets) override;
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void GetCompleteObjCClass(ConstString class_name, bool must_be_implementation,
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DIEArray &offsets) override;
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void GetTypes(ConstString name, DIEArray &offsets) override;
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void GetTypes(const DWARFDeclContext &context, DIEArray &offsets) override;
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void GetNamespaces(ConstString name, DIEArray &offsets) override;
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DWARF: Add "dwo_num" field to the DIERef class
Summary:
When dwo support was introduced, it used a trick where debug info
entries were referenced by the offset of the compile unit in the main
file, but the die offset was relative to the dwo file. Although there
was some elegance to it, this representation was starting to reach its
breaking point:
- the fact that the skeleton compile unit owned the DWO file meant that
it was impossible (or at least hard and unintuitive) to support DWO
files containing more than one compile unit. These kinds of files are
produced by LTO for example.
- it made it impossible to reference any DIEs in the skeleton compile
unit (although the skeleton units are generally empty, clang still
puts some info into them with -fsplit-dwarf-inlining).
- (current motivation) it made it very hard to support type units placed
in DWO files, as type units don't have any skeleton units which could
be referenced in the main file
This patch addresses this problem by introducing an new
"dwo_num" field to the DIERef class, whose purpose is to identify the
dwo file. It's kind of similar to the dwo_id field in DWARF5 unit
headers, but while this is a 64bit hash whose main purpose is to catch
file mismatches, this is just a smaller integer used to indentify a
loaded dwo file. Currently, this is based on the index of the skeleton
compile unit which owns the dwo file, but it is intended to be
eventually independent of that (to support the LTO use case).
Simultaneously the cu_offset is dropped to conserve space, as it is no
longer necessary. This means we can remove the "BaseObjectOffset" field
from the DWARFUnit class. It also means we can remove some of the
workarounds put in place to support the skeleton-unit+dwo-die combo.
More work is needed to remove all of them, which is out of scope of this
patch.
Reviewers: JDevlieghere, clayborg, aprantl
Subscribers: mehdi_amini, dexonsmith, arphaman, lldb-commits
Differential Revision: https://reviews.llvm.org/D63428
llvm-svn: 364009
2019-06-21 15:56:50 +08:00
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void GetFunctions(ConstString name, SymbolFileDWARF &dwarf,
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2018-06-05 18:33:56 +08:00
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const CompilerDeclContext &parent_decl_ctx,
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uint32_t name_type_mask,
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std::vector<DWARFDIE> &dies) override;
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2018-06-05 20:13:22 +08:00
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void GetFunctions(const RegularExpression ®ex, DIEArray &offsets) override;
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2018-05-21 22:12:52 +08:00
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2019-06-14 20:01:18 +08:00
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void ReportInvalidDIERef(const DIERef &ref, llvm::StringRef name) override;
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2018-05-21 22:12:52 +08:00
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void Dump(Stream &s) override;
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private:
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std::unique_ptr<DWARFMappedHash::MemoryTable> m_apple_names_up;
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std::unique_ptr<DWARFMappedHash::MemoryTable> m_apple_namespaces_up;
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std::unique_ptr<DWARFMappedHash::MemoryTable> m_apple_types_up;
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std::unique_ptr<DWARFMappedHash::MemoryTable> m_apple_objc_up;
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};
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} // namespace lldb_private
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#endif // LLDB_APPLEDWARFINDEX_H
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