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| //===-- DWARFAbbreviationDeclaration.cpp ------------------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "DWARFAbbreviationDeclaration.h"
#include "lldb/Core/dwarf.h"
#include "lldb/Utility/Stream.h"
#include "llvm/Object/Error.h"
#include "DWARFFormValue.h"
using namespace lldb_private;
DWARFAbbreviationDeclaration::DWARFAbbreviationDeclaration()
: m_code(InvalidCode), m_tag(llvm::dwarf::DW_TAG_null), m_has_children(0),
m_attributes() {}
DWARFAbbreviationDeclaration::DWARFAbbreviationDeclaration(dw_tag_t tag,
uint8_t has_children)
: m_code(InvalidCode), m_tag(tag), m_has_children(has_children),
m_attributes() {}
llvm::Expected<DWARFEnumState>
DWARFAbbreviationDeclaration::extract(const DWARFDataExtractor &data,
lldb::offset_t *offset_ptr) {
m_code = data.GetULEB128(offset_ptr);
if (m_code == 0)
return DWARFEnumState::Complete;
m_attributes.clear();
m_tag = static_cast<dw_tag_t>(data.GetULEB128(offset_ptr));
if (m_tag == DW_TAG_null)
return llvm::make_error<llvm::object::GenericBinaryError>(
"abbrev decl requires non-null tag.");
m_has_children = data.GetU8(offset_ptr);
while (data.ValidOffset(*offset_ptr)) {
dw_attr_t attr = data.GetULEB128(offset_ptr);
dw_form_t form = data.GetULEB128(offset_ptr);
// This is the last attribute for this abbrev decl, but there may still be
// more abbrev decls, so return MoreItems to indicate to the caller that
// they should call this function again.
if (!attr && !form)
return DWARFEnumState::MoreItems;
if (!attr || !form)
return llvm::make_error<llvm::object::GenericBinaryError>(
"malformed abbreviation declaration attribute");
DWARFFormValue::ValueType val;
if (form == DW_FORM_implicit_const)
val.value.sval = data.GetULEB128(offset_ptr);
m_attributes.push_back(DWARFAttribute(attr, form, val));
}
return llvm::make_error<llvm::object::GenericBinaryError>(
"abbreviation declaration attribute list not terminated with a null "
"entry");
}
bool DWARFAbbreviationDeclaration::IsValid() {
return m_code != 0 && m_tag != llvm::dwarf::DW_TAG_null;
}
uint32_t
DWARFAbbreviationDeclaration::FindAttributeIndex(dw_attr_t attr) const {
uint32_t i;
const uint32_t kNumAttributes = m_attributes.size();
for (i = 0; i < kNumAttributes; ++i) {
if (m_attributes[i].get_attr() == attr)
return i;
}
return DW_INVALID_INDEX;
}
bool DWARFAbbreviationDeclaration::
operator==(const DWARFAbbreviationDeclaration &rhs) const {
return Tag() == rhs.Tag() && HasChildren() == rhs.HasChildren() &&
m_attributes == rhs.m_attributes;
}
|