91 lines
3.0 KiB
C++
91 lines
3.0 KiB
C++
//===-- DWARFAbbreviationDeclaration.cpp ----------------------------------===//
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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 "DWARFAbbreviationDeclaration.h"
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#include "lldb/Core/dwarf.h"
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#include "lldb/Utility/Stream.h"
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#include "llvm/Object/Error.h"
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#include "DWARFFormValue.h"
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using namespace lldb_private;
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DWARFAbbreviationDeclaration::DWARFAbbreviationDeclaration()
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: m_code(InvalidCode), m_tag(llvm::dwarf::DW_TAG_null), m_has_children(0),
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m_attributes() {}
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DWARFAbbreviationDeclaration::DWARFAbbreviationDeclaration(dw_tag_t tag,
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uint8_t has_children)
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: m_code(InvalidCode), m_tag(tag), m_has_children(has_children),
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m_attributes() {}
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llvm::Expected<DWARFEnumState>
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DWARFAbbreviationDeclaration::extract(const DWARFDataExtractor &data,
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lldb::offset_t *offset_ptr) {
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m_code = data.GetULEB128(offset_ptr);
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if (m_code == 0)
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return DWARFEnumState::Complete;
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m_attributes.clear();
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m_tag = static_cast<dw_tag_t>(data.GetULEB128(offset_ptr));
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if (m_tag == DW_TAG_null)
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return llvm::make_error<llvm::object::GenericBinaryError>(
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"abbrev decl requires non-null tag.");
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m_has_children = data.GetU8(offset_ptr);
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while (data.ValidOffset(*offset_ptr)) {
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dw_attr_t attr = data.GetULEB128(offset_ptr);
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dw_form_t form = data.GetULEB128(offset_ptr);
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// This is the last attribute for this abbrev decl, but there may still be
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// more abbrev decls, so return MoreItems to indicate to the caller that
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// they should call this function again.
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if (!attr && !form)
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return DWARFEnumState::MoreItems;
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if (!attr || !form)
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return llvm::make_error<llvm::object::GenericBinaryError>(
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"malformed abbreviation declaration attribute");
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DWARFFormValue::ValueType val;
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if (form == DW_FORM_implicit_const)
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val.value.sval = data.GetULEB128(offset_ptr);
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m_attributes.push_back(DWARFAttribute(attr, form, val));
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}
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return llvm::make_error<llvm::object::GenericBinaryError>(
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"abbreviation declaration attribute list not terminated with a null "
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"entry");
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}
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bool DWARFAbbreviationDeclaration::IsValid() {
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return m_code != 0 && m_tag != llvm::dwarf::DW_TAG_null;
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}
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uint32_t
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DWARFAbbreviationDeclaration::FindAttributeIndex(dw_attr_t attr) const {
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uint32_t i;
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const uint32_t kNumAttributes = m_attributes.size();
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for (i = 0; i < kNumAttributes; ++i) {
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if (m_attributes[i].get_attr() == attr)
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return i;
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}
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return DW_INVALID_INDEX;
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}
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bool DWARFAbbreviationDeclaration::
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operator==(const DWARFAbbreviationDeclaration &rhs) const {
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return Tag() == rhs.Tag() && HasChildren() == rhs.HasChildren() &&
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m_attributes == rhs.m_attributes;
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}
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