forked from OSchip/llvm-project
552 lines
21 KiB
C++
552 lines
21 KiB
C++
//===-- LineTable.cpp -------------------------------------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#include "lldb/Symbol/LineTable.h"
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#include "lldb/Core/Address.h"
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#include "lldb/Core/Module.h"
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#include "lldb/Core/Section.h"
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#include "lldb/Symbol/CompileUnit.h"
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#include "lldb/Utility/Stream.h"
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#include <algorithm>
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using namespace lldb;
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using namespace lldb_private;
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//----------------------------------------------------------------------
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// LineTable constructor
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//----------------------------------------------------------------------
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LineTable::LineTable(CompileUnit *comp_unit)
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: m_comp_unit(comp_unit), m_entries() {}
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//----------------------------------------------------------------------
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// Destructor
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//----------------------------------------------------------------------
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LineTable::~LineTable() {}
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void LineTable::InsertLineEntry(lldb::addr_t file_addr, uint32_t line,
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uint16_t column, uint16_t file_idx,
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bool is_start_of_statement,
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bool is_start_of_basic_block,
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bool is_prologue_end, bool is_epilogue_begin,
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bool is_terminal_entry) {
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Entry entry(file_addr, line, column, file_idx, is_start_of_statement,
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is_start_of_basic_block, is_prologue_end, is_epilogue_begin,
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is_terminal_entry);
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entry_collection::iterator begin_pos = m_entries.begin();
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entry_collection::iterator end_pos = m_entries.end();
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LineTable::Entry::LessThanBinaryPredicate less_than_bp(this);
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entry_collection::iterator pos =
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upper_bound(begin_pos, end_pos, entry, less_than_bp);
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// Stream s(stdout);
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// s << "\n\nBefore:\n";
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// Dump (&s, Address::DumpStyleFileAddress);
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m_entries.insert(pos, entry);
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// s << "After:\n";
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// Dump (&s, Address::DumpStyleFileAddress);
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}
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LineSequence::LineSequence() {}
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void LineTable::LineSequenceImpl::Clear() { m_entries.clear(); }
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LineSequence *LineTable::CreateLineSequenceContainer() {
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return new LineTable::LineSequenceImpl();
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}
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void LineTable::AppendLineEntryToSequence(
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LineSequence *sequence, lldb::addr_t file_addr, uint32_t line,
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uint16_t column, uint16_t file_idx, bool is_start_of_statement,
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bool is_start_of_basic_block, bool is_prologue_end, bool is_epilogue_begin,
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bool is_terminal_entry) {
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assert(sequence != nullptr);
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LineSequenceImpl *seq = reinterpret_cast<LineSequenceImpl *>(sequence);
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Entry entry(file_addr, line, column, file_idx, is_start_of_statement,
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is_start_of_basic_block, is_prologue_end, is_epilogue_begin,
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is_terminal_entry);
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entry_collection &entries = seq->m_entries;
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// Replace the last entry if the address is the same, otherwise append it. If
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// we have multiple
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// line entries at the same address, this indicates illegal DWARF so this
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// "fixes" the line table
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// to be correct. If not fixed this can cause a line entry's address that when
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// resolved back to
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// a symbol context, could resolve to a different line entry. We really want a
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// 1 to 1 mapping
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// here to avoid these kinds of inconsistencies. We will need tor revisit this
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// if the DWARF line
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// tables are updated to allow multiple entries at the same address legally.
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if (!entries.empty() && entries.back().file_addr == file_addr) {
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// GCC don't use the is_prologue_end flag to mark the first instruction
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// after the prologue.
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// Instead of it it is issuing a line table entry for the first instruction
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// of the prologue
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// and one for the first instruction after the prologue. If the size of the
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// prologue is 0
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// instruction then the 2 line entry will have the same file address.
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// Removing it will remove
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// our ability to properly detect the location of the end of prologe so we
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// set the prologue_end
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// flag to preserve this information (setting the prologue_end flag for an
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// entry what is after
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// the prologue end don't have any effect)
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entry.is_prologue_end = entry.file_idx == entries.back().file_idx;
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entries.back() = entry;
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} else
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entries.push_back(entry);
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}
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void LineTable::InsertSequence(LineSequence *sequence) {
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assert(sequence != nullptr);
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LineSequenceImpl *seq = reinterpret_cast<LineSequenceImpl *>(sequence);
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if (seq->m_entries.empty())
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return;
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Entry &entry = seq->m_entries.front();
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// If the first entry address in this sequence is greater than or equal to
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// the address of the last item in our entry collection, just append.
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if (m_entries.empty() ||
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!Entry::EntryAddressLessThan(entry, m_entries.back())) {
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m_entries.insert(m_entries.end(), seq->m_entries.begin(),
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seq->m_entries.end());
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return;
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}
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// Otherwise, find where this belongs in the collection
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entry_collection::iterator begin_pos = m_entries.begin();
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entry_collection::iterator end_pos = m_entries.end();
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LineTable::Entry::LessThanBinaryPredicate less_than_bp(this);
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entry_collection::iterator pos =
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upper_bound(begin_pos, end_pos, entry, less_than_bp);
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// We should never insert a sequence in the middle of another sequence
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if (pos != begin_pos) {
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while (pos < end_pos && !((pos - 1)->is_terminal_entry))
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pos++;
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}
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#ifdef LLDB_CONFIGURATION_DEBUG
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// If we aren't inserting at the beginning, the previous entry should
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// terminate a sequence.
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if (pos != begin_pos) {
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entry_collection::iterator prev_pos = pos - 1;
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assert(prev_pos->is_terminal_entry);
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}
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#endif
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m_entries.insert(pos, seq->m_entries.begin(), seq->m_entries.end());
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}
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//----------------------------------------------------------------------
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LineTable::Entry::LessThanBinaryPredicate::LessThanBinaryPredicate(
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LineTable *line_table)
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: m_line_table(line_table) {}
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bool LineTable::Entry::LessThanBinaryPredicate::
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operator()(const LineTable::Entry &a, const LineTable::Entry &b) const {
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#define LT_COMPARE(a, b) \
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if (a != b) \
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return a < b
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LT_COMPARE(a.file_addr, b.file_addr);
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// b and a reversed on purpose below.
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LT_COMPARE(b.is_terminal_entry, a.is_terminal_entry);
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LT_COMPARE(a.line, b.line);
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LT_COMPARE(a.column, b.column);
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LT_COMPARE(a.is_start_of_statement, b.is_start_of_statement);
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LT_COMPARE(a.is_start_of_basic_block, b.is_start_of_basic_block);
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// b and a reversed on purpose below.
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LT_COMPARE(b.is_prologue_end, a.is_prologue_end);
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LT_COMPARE(a.is_epilogue_begin, b.is_epilogue_begin);
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LT_COMPARE(a.file_idx, b.file_idx);
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return false;
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#undef LT_COMPARE
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}
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uint32_t LineTable::GetSize() const { return m_entries.size(); }
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bool LineTable::GetLineEntryAtIndex(uint32_t idx, LineEntry &line_entry) {
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if (idx < m_entries.size()) {
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ConvertEntryAtIndexToLineEntry(idx, line_entry);
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return true;
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}
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line_entry.Clear();
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return false;
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}
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bool LineTable::FindLineEntryByAddress(const Address &so_addr,
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LineEntry &line_entry,
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uint32_t *index_ptr) {
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if (index_ptr != nullptr)
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*index_ptr = UINT32_MAX;
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bool success = false;
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if (so_addr.GetModule().get() == m_comp_unit->GetModule().get()) {
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Entry search_entry;
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search_entry.file_addr = so_addr.GetFileAddress();
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if (search_entry.file_addr != LLDB_INVALID_ADDRESS) {
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entry_collection::const_iterator begin_pos = m_entries.begin();
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entry_collection::const_iterator end_pos = m_entries.end();
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entry_collection::const_iterator pos = lower_bound(
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begin_pos, end_pos, search_entry, Entry::EntryAddressLessThan);
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if (pos != end_pos) {
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if (pos != begin_pos) {
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if (pos->file_addr != search_entry.file_addr)
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--pos;
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else if (pos->file_addr == search_entry.file_addr) {
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// If this is a termination entry, it shouldn't match since
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// entries with the "is_terminal_entry" member set to true
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// are termination entries that define the range for the
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// previous entry.
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if (pos->is_terminal_entry) {
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// The matching entry is a terminal entry, so we skip
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// ahead to the next entry to see if there is another
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// entry following this one whose section/offset matches.
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++pos;
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if (pos != end_pos) {
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if (pos->file_addr != search_entry.file_addr)
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pos = end_pos;
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}
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}
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if (pos != end_pos) {
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// While in the same section/offset backup to find the first
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// line entry that matches the address in case there are
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// multiple
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while (pos != begin_pos) {
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entry_collection::const_iterator prev_pos = pos - 1;
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if (prev_pos->file_addr == search_entry.file_addr &&
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prev_pos->is_terminal_entry == false)
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--pos;
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else
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break;
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}
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}
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}
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}
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else
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{
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// There might be code in the containing objfile before the first line
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// table entry. Make sure that does not get considered part of the first
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// line table entry.
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if (pos->file_addr > so_addr.GetFileAddress())
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return false;
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}
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// Make sure we have a valid match and that the match isn't a
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// terminating
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// entry for a previous line...
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if (pos != end_pos && pos->is_terminal_entry == false) {
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uint32_t match_idx = std::distance(begin_pos, pos);
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success = ConvertEntryAtIndexToLineEntry(match_idx, line_entry);
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if (index_ptr != nullptr && success)
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*index_ptr = match_idx;
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}
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}
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}
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}
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return success;
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}
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bool LineTable::ConvertEntryAtIndexToLineEntry(uint32_t idx,
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LineEntry &line_entry) {
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if (idx < m_entries.size()) {
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const Entry &entry = m_entries[idx];
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ModuleSP module_sp(m_comp_unit->GetModule());
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if (module_sp &&
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module_sp->ResolveFileAddress(entry.file_addr,
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line_entry.range.GetBaseAddress())) {
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if (!entry.is_terminal_entry && idx + 1 < m_entries.size())
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line_entry.range.SetByteSize(m_entries[idx + 1].file_addr -
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entry.file_addr);
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else
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line_entry.range.SetByteSize(0);
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line_entry.file =
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m_comp_unit->GetSupportFiles().GetFileSpecAtIndex(entry.file_idx);
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line_entry.original_file =
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m_comp_unit->GetSupportFiles().GetFileSpecAtIndex(entry.file_idx);
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line_entry.line = entry.line;
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line_entry.column = entry.column;
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line_entry.is_start_of_statement = entry.is_start_of_statement;
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line_entry.is_start_of_basic_block = entry.is_start_of_basic_block;
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line_entry.is_prologue_end = entry.is_prologue_end;
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line_entry.is_epilogue_begin = entry.is_epilogue_begin;
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line_entry.is_terminal_entry = entry.is_terminal_entry;
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return true;
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}
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}
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return false;
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}
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uint32_t LineTable::FindLineEntryIndexByFileIndex(
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uint32_t start_idx, const std::vector<uint32_t> &file_indexes,
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uint32_t line, bool exact, LineEntry *line_entry_ptr) {
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const size_t count = m_entries.size();
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std::vector<uint32_t>::const_iterator begin_pos = file_indexes.begin();
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std::vector<uint32_t>::const_iterator end_pos = file_indexes.end();
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size_t best_match = UINT32_MAX;
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for (size_t idx = start_idx; idx < count; ++idx) {
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// Skip line table rows that terminate the previous row (is_terminal_entry
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// is non-zero)
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if (m_entries[idx].is_terminal_entry)
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continue;
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if (find(begin_pos, end_pos, m_entries[idx].file_idx) == end_pos)
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continue;
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// Exact match always wins. Otherwise try to find the closest line > the
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// desired
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// line.
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// FIXME: Maybe want to find the line closest before and the line closest
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// after and
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// if they're not in the same function, don't return a match.
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if (m_entries[idx].line < line) {
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continue;
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} else if (m_entries[idx].line == line) {
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if (line_entry_ptr)
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ConvertEntryAtIndexToLineEntry(idx, *line_entry_ptr);
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return idx;
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} else if (!exact) {
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if (best_match == UINT32_MAX)
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best_match = idx;
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else if (m_entries[idx].line < m_entries[best_match].line)
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best_match = idx;
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}
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}
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if (best_match != UINT32_MAX) {
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if (line_entry_ptr)
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ConvertEntryAtIndexToLineEntry(best_match, *line_entry_ptr);
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return best_match;
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}
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return UINT32_MAX;
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}
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uint32_t LineTable::FindLineEntryIndexByFileIndex(uint32_t start_idx,
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uint32_t file_idx,
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uint32_t line, bool exact,
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LineEntry *line_entry_ptr) {
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const size_t count = m_entries.size();
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size_t best_match = UINT32_MAX;
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for (size_t idx = start_idx; idx < count; ++idx) {
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// Skip line table rows that terminate the previous row (is_terminal_entry
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// is non-zero)
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if (m_entries[idx].is_terminal_entry)
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continue;
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if (m_entries[idx].file_idx != file_idx)
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continue;
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// Exact match always wins. Otherwise try to find the closest line > the
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// desired
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// line.
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// FIXME: Maybe want to find the line closest before and the line closest
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// after and
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// if they're not in the same function, don't return a match.
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if (m_entries[idx].line < line) {
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continue;
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} else if (m_entries[idx].line == line) {
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if (line_entry_ptr)
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ConvertEntryAtIndexToLineEntry(idx, *line_entry_ptr);
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return idx;
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} else if (!exact) {
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if (best_match == UINT32_MAX)
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best_match = idx;
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else if (m_entries[idx].line < m_entries[best_match].line)
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best_match = idx;
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}
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}
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if (best_match != UINT32_MAX) {
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if (line_entry_ptr)
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ConvertEntryAtIndexToLineEntry(best_match, *line_entry_ptr);
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return best_match;
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}
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return UINT32_MAX;
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}
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size_t LineTable::FineLineEntriesForFileIndex(uint32_t file_idx, bool append,
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SymbolContextList &sc_list) {
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if (!append)
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sc_list.Clear();
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size_t num_added = 0;
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const size_t count = m_entries.size();
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if (count > 0) {
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SymbolContext sc(m_comp_unit);
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for (size_t idx = 0; idx < count; ++idx) {
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// Skip line table rows that terminate the previous row (is_terminal_entry
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// is non-zero)
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if (m_entries[idx].is_terminal_entry)
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continue;
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if (m_entries[idx].file_idx == file_idx) {
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if (ConvertEntryAtIndexToLineEntry(idx, sc.line_entry)) {
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++num_added;
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sc_list.Append(sc);
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}
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}
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}
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}
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return num_added;
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}
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void LineTable::Dump(Stream *s, Target *target, Address::DumpStyle style,
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Address::DumpStyle fallback_style, bool show_line_ranges) {
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const size_t count = m_entries.size();
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LineEntry line_entry;
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FileSpec prev_file;
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for (size_t idx = 0; idx < count; ++idx) {
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ConvertEntryAtIndexToLineEntry(idx, line_entry);
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line_entry.Dump(s, target, prev_file != line_entry.original_file, style,
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fallback_style, show_line_ranges);
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s->EOL();
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prev_file = line_entry.original_file;
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}
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}
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void LineTable::GetDescription(Stream *s, Target *target,
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DescriptionLevel level) {
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const size_t count = m_entries.size();
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LineEntry line_entry;
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for (size_t idx = 0; idx < count; ++idx) {
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ConvertEntryAtIndexToLineEntry(idx, line_entry);
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line_entry.GetDescription(s, level, m_comp_unit, target, true);
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s->EOL();
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}
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}
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size_t LineTable::GetContiguousFileAddressRanges(FileAddressRanges &file_ranges,
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bool append) {
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if (!append)
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file_ranges.Clear();
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const size_t initial_count = file_ranges.GetSize();
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const size_t count = m_entries.size();
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LineEntry line_entry;
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FileAddressRanges::Entry range(LLDB_INVALID_ADDRESS, 0);
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for (size_t idx = 0; idx < count; ++idx) {
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const Entry &entry = m_entries[idx];
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if (entry.is_terminal_entry) {
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if (range.GetRangeBase() != LLDB_INVALID_ADDRESS) {
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range.SetRangeEnd(entry.file_addr);
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file_ranges.Append(range);
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range.Clear(LLDB_INVALID_ADDRESS);
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}
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} else if (range.GetRangeBase() == LLDB_INVALID_ADDRESS) {
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range.SetRangeBase(entry.file_addr);
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}
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}
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return file_ranges.GetSize() - initial_count;
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}
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LineTable *LineTable::LinkLineTable(const FileRangeMap &file_range_map) {
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std::unique_ptr<LineTable> line_table_ap(new LineTable(m_comp_unit));
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LineSequenceImpl sequence;
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const size_t count = m_entries.size();
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LineEntry line_entry;
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const FileRangeMap::Entry *file_range_entry = nullptr;
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const FileRangeMap::Entry *prev_file_range_entry = nullptr;
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lldb::addr_t prev_file_addr = LLDB_INVALID_ADDRESS;
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bool prev_entry_was_linked = false;
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bool range_changed = false;
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for (size_t idx = 0; idx < count; ++idx) {
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const Entry &entry = m_entries[idx];
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const bool end_sequence = entry.is_terminal_entry;
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const lldb::addr_t lookup_file_addr =
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entry.file_addr - (end_sequence ? 1 : 0);
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if (file_range_entry == nullptr ||
|
||
!file_range_entry->Contains(lookup_file_addr)) {
|
||
prev_file_range_entry = file_range_entry;
|
||
file_range_entry = file_range_map.FindEntryThatContains(lookup_file_addr);
|
||
range_changed = true;
|
||
}
|
||
|
||
lldb::addr_t prev_end_entry_linked_file_addr = LLDB_INVALID_ADDRESS;
|
||
lldb::addr_t entry_linked_file_addr = LLDB_INVALID_ADDRESS;
|
||
|
||
bool terminate_previous_entry = false;
|
||
if (file_range_entry) {
|
||
entry_linked_file_addr = entry.file_addr -
|
||
file_range_entry->GetRangeBase() +
|
||
file_range_entry->data;
|
||
// Determine if we need to terminate the previous entry when the previous
|
||
// entry was not contiguous with this one after being linked.
|
||
if (range_changed && prev_file_range_entry) {
|
||
prev_end_entry_linked_file_addr =
|
||
std::min<lldb::addr_t>(entry.file_addr,
|
||
prev_file_range_entry->GetRangeEnd()) -
|
||
prev_file_range_entry->GetRangeBase() + prev_file_range_entry->data;
|
||
if (prev_end_entry_linked_file_addr != entry_linked_file_addr)
|
||
terminate_previous_entry = prev_entry_was_linked;
|
||
}
|
||
} else if (prev_entry_was_linked) {
|
||
// This entry doesn't have a remapping and it needs to be removed.
|
||
// Watch out in case we need to terminate a previous entry needs to
|
||
// be terminated now that one line entry in a sequence is not longer
|
||
// valid.
|
||
if (!sequence.m_entries.empty() &&
|
||
!sequence.m_entries.back().is_terminal_entry) {
|
||
terminate_previous_entry = true;
|
||
}
|
||
}
|
||
|
||
if (terminate_previous_entry && !sequence.m_entries.empty()) {
|
||
assert(prev_file_addr != LLDB_INVALID_ADDRESS);
|
||
UNUSED_IF_ASSERT_DISABLED(prev_file_addr);
|
||
sequence.m_entries.push_back(sequence.m_entries.back());
|
||
if (prev_end_entry_linked_file_addr == LLDB_INVALID_ADDRESS)
|
||
prev_end_entry_linked_file_addr =
|
||
std::min<lldb::addr_t>(entry.file_addr,
|
||
prev_file_range_entry->GetRangeEnd()) -
|
||
prev_file_range_entry->GetRangeBase() + prev_file_range_entry->data;
|
||
sequence.m_entries.back().file_addr = prev_end_entry_linked_file_addr;
|
||
sequence.m_entries.back().is_terminal_entry = true;
|
||
|
||
// Append the sequence since we just terminated the previous one
|
||
line_table_ap->InsertSequence(&sequence);
|
||
sequence.Clear();
|
||
}
|
||
|
||
// Now link the current entry
|
||
if (file_range_entry) {
|
||
// This entry has an address remapping and it needs to have its address
|
||
// relinked
|
||
sequence.m_entries.push_back(entry);
|
||
sequence.m_entries.back().file_addr = entry_linked_file_addr;
|
||
}
|
||
|
||
// If we have items in the sequence and the last entry is a terminal entry,
|
||
// insert this sequence into our new line table.
|
||
if (!sequence.m_entries.empty() &&
|
||
sequence.m_entries.back().is_terminal_entry) {
|
||
line_table_ap->InsertSequence(&sequence);
|
||
sequence.Clear();
|
||
prev_entry_was_linked = false;
|
||
} else {
|
||
prev_entry_was_linked = file_range_entry != nullptr;
|
||
}
|
||
prev_file_addr = entry.file_addr;
|
||
range_changed = false;
|
||
}
|
||
if (line_table_ap->m_entries.empty())
|
||
return nullptr;
|
||
return line_table_ap.release();
|
||
}
|