f4014e116e
Summary: This patch adds the ability to precisely address debug info in situations when a single file can have more than one debug-info-bearing sections (as is the case with type units in DWARF v4). The changes here can be classified into roughly three categories: - the code which addresses a debug info by offset gets an additional argument, which specifies the section one should look into. - the DIERef class also gets an additional member variable specifying the section. This way, code dealing with DIERefs can know which section is the object referring to. - the user_id_t encoding steals one bit from the dwarf_id field to store the section. This means the total number of separate object files (apple .o, or normal .dwo) is limited to 2 billion, but that is fine as it's not possible to hit that number without switching to DWARF64 anyway. This patch is functionally equivalent to (and inspired by) the two patches (D61503 and D61504) by Jan Kratochvil, but there are differences in the implementation: - it uses an enum instead of a bool flag to differentiate the sections - it increases the size of DIERef struct instead of reducing the amount of addressable debug info - it sets up DWARFDebugInfo to store the units in a single vector instead of two. This sets us up for the future in which type units can also live in the debug_info section, and I believe it's cleaner because there's no need for unit index remapping There are no tests with this patch as this is essentially NFC until we start parsing type units from the debug_types section. Reviewers: JDevlieghere, clayborg, aprantl Subscribers: arphaman, jankratochvil, lldb-commits Differential Revision: https://reviews.llvm.org/D61908 llvm-svn: 360872
29 lines
943 B
C++
29 lines
943 B
C++
//===-- DIERef.cpp ----------------------------------------------*- C++ -*-===//
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//
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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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//
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//===----------------------------------------------------------------------===//
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#include "DIERef.h"
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#include "DWARFUnit.h"
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#include "DWARFDebugInfo.h"
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#include "DWARFFormValue.h"
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#include "SymbolFileDWARF.h"
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#include "SymbolFileDWARFDebugMap.h"
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DIERef::DIERef(const DWARFFormValue &form_value) {
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if (form_value.IsValid()) {
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DWARFDIE die = form_value.Reference();
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die_offset = die.GetOffset();
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if (die) {
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section = die.GetCU()->GetDebugSection();
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if (die.GetCU()->GetBaseObjOffset() != DW_INVALID_OFFSET)
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cu_offset = die.GetCU()->GetBaseObjOffset();
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else
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cu_offset = die.GetCU()->GetOffset();
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}
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}
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}
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