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//===-- DWARFDebugAbbrev.cpp ----------------------------------------------===//
//
// 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 "DWARFDebugAbbrev.h"
#include "DWARFDataExtractor.h"
#include "lldb/Utility/Stream.h"
using namespace lldb;
using namespace lldb_private;
using namespace std;
// DWARFAbbreviationDeclarationSet::Clear()
void DWARFAbbreviationDeclarationSet::Clear() {
m_idx_offset = 0;
m_decls.clear();
}
// DWARFAbbreviationDeclarationSet::Extract()
llvm::Error
DWARFAbbreviationDeclarationSet::extract(const DWARFDataExtractor &data,
lldb::offset_t *offset_ptr) {
const lldb::offset_t begin_offset = *offset_ptr;
m_offset = begin_offset;
Clear();
DWARFAbbreviationDeclaration abbrevDeclaration;
dw_uleb128_t prev_abbr_code = 0;
while (true) {
llvm::Expected<DWARFEnumState> es =
abbrevDeclaration.extract(data, offset_ptr);
if (!es)
return es.takeError();
if (*es == DWARFEnumState::Complete)
break;
m_decls.push_back(abbrevDeclaration);
if (m_idx_offset == 0)
m_idx_offset = abbrevDeclaration.Code();
else if (prev_abbr_code + 1 != abbrevDeclaration.Code()) {
// Out of order indexes, we can't do O(1) lookups...
m_idx_offset = UINT32_MAX;
}
prev_abbr_code = abbrevDeclaration.Code();
}
return llvm::ErrorSuccess();
}
// DWARFAbbreviationDeclarationSet::GetAbbreviationDeclaration()
const DWARFAbbreviationDeclaration *
DWARFAbbreviationDeclarationSet::GetAbbreviationDeclaration(
dw_uleb128_t abbrCode) const {
if (m_idx_offset == UINT32_MAX) {
DWARFAbbreviationDeclarationCollConstIter pos;
DWARFAbbreviationDeclarationCollConstIter end = m_decls.end();
for (pos = m_decls.begin(); pos != end; ++pos) {
if (pos->Code() == abbrCode)
return &(*pos);
}
} else {
uint32_t idx = abbrCode - m_idx_offset;
if (idx < m_decls.size())
return &m_decls[idx];
}
return nullptr;
}
// DWARFAbbreviationDeclarationSet::GetUnsupportedForms()
void DWARFAbbreviationDeclarationSet::GetUnsupportedForms(
std::set<dw_form_t> &invalid_forms) const {
for (const auto &abbr_decl : m_decls) {
const size_t num_attrs = abbr_decl.NumAttributes();
for (size_t i=0; i<num_attrs; ++i) {
dw_form_t form = abbr_decl.GetFormByIndex(i);
if (!DWARFFormValue::FormIsSupported(form))
invalid_forms.insert(form);
}
}
}
// Encode
//
// Encode the abbreviation table onto the end of the buffer provided into a
// byte representation as would be found in a ".debug_abbrev" debug information
// section.
// void
// DWARFAbbreviationDeclarationSet::Encode(BinaryStreamBuf& debug_abbrev_buf)
// const
//{
// DWARFAbbreviationDeclarationCollConstIter pos;
// DWARFAbbreviationDeclarationCollConstIter end = m_decls.end();
// for (pos = m_decls.begin(); pos != end; ++pos)
// pos->Append(debug_abbrev_buf);
// debug_abbrev_buf.Append8(0);
//}
// DWARFDebugAbbrev constructor
DWARFDebugAbbrev::DWARFDebugAbbrev()
: m_abbrevCollMap(), m_prev_abbr_offset_pos(m_abbrevCollMap.end()) {}
// DWARFDebugAbbrev::Parse()
llvm::Error DWARFDebugAbbrev::parse(const DWARFDataExtractor &data) {
lldb::offset_t offset = 0;
while (data.ValidOffset(offset)) {
uint32_t initial_cu_offset = offset;
DWARFAbbreviationDeclarationSet abbrevDeclSet;
llvm::Error error = abbrevDeclSet.extract(data, &offset);
if (error)
return error;
m_abbrevCollMap[initial_cu_offset] = abbrevDeclSet;
}
m_prev_abbr_offset_pos = m_abbrevCollMap.end();
return llvm::ErrorSuccess();
}
// DWARFDebugAbbrev::GetAbbreviationDeclarationSet()
const DWARFAbbreviationDeclarationSet *
DWARFDebugAbbrev::GetAbbreviationDeclarationSet(
dw_offset_t cu_abbr_offset) const {
DWARFAbbreviationDeclarationCollMapConstIter end = m_abbrevCollMap.end();
DWARFAbbreviationDeclarationCollMapConstIter pos;
if (m_prev_abbr_offset_pos != end &&
m_prev_abbr_offset_pos->first == cu_abbr_offset)
return &(m_prev_abbr_offset_pos->second);
else {
pos = m_abbrevCollMap.find(cu_abbr_offset);
m_prev_abbr_offset_pos = pos;
}
if (pos != m_abbrevCollMap.end())
return &(pos->second);
return nullptr;
}
// DWARFDebugAbbrev::GetUnsupportedForms()
void DWARFDebugAbbrev::GetUnsupportedForms(
std::set<dw_form_t> &invalid_forms) const {
for (const auto &pair : m_abbrevCollMap)
pair.second.GetUnsupportedForms(invalid_forms);
}
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