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451 lines
12 KiB
451 lines
12 KiB
//===-- DWARFDIE.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 "DWARFDIE.h"
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#include "DWARFASTParser.h"
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#include "DWARFDebugInfo.h"
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#include "DWARFDebugInfoEntry.h"
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#include "DWARFDeclContext.h"
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#include "DWARFUnit.h"
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using namespace lldb_private;
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namespace {
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/// Iterate through all DIEs elaborating (i.e. reachable by a chain of
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/// DW_AT_specification and DW_AT_abstract_origin attributes) a given DIE. For
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/// convenience, the starting die is included in the sequence as the first
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/// item.
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class ElaboratingDIEIterator
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: public std::iterator<std::input_iterator_tag, DWARFDIE> {
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// The operating invariant is: top of m_worklist contains the "current" item
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// and the rest of the list are items yet to be visited. An empty worklist
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// means we've reached the end.
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// Infinite recursion is prevented by maintaining a list of seen DIEs.
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// Container sizes are optimized for the case of following DW_AT_specification
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// and DW_AT_abstract_origin just once.
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llvm::SmallVector<DWARFDIE, 2> m_worklist;
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llvm::SmallSet<DWARFDebugInfoEntry *, 3> m_seen;
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void Next() {
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assert(!m_worklist.empty() && "Incrementing end iterator?");
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// Pop the current item from the list.
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DWARFDIE die = m_worklist.back();
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m_worklist.pop_back();
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// And add back any items that elaborate it.
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for (dw_attr_t attr : {DW_AT_specification, DW_AT_abstract_origin}) {
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if (DWARFDIE d = die.GetReferencedDIE(attr))
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if (m_seen.insert(die.GetDIE()).second)
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m_worklist.push_back(d);
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}
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}
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public:
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/// An iterator starting at die d.
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explicit ElaboratingDIEIterator(DWARFDIE d) : m_worklist(1, d) {}
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/// End marker
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ElaboratingDIEIterator() {}
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const DWARFDIE &operator*() const { return m_worklist.back(); }
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ElaboratingDIEIterator &operator++() {
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Next();
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return *this;
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}
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ElaboratingDIEIterator operator++(int) {
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ElaboratingDIEIterator I = *this;
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Next();
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return I;
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}
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friend bool operator==(const ElaboratingDIEIterator &a,
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const ElaboratingDIEIterator &b) {
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if (a.m_worklist.empty() || b.m_worklist.empty())
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return a.m_worklist.empty() == b.m_worklist.empty();
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return a.m_worklist.back() == b.m_worklist.back();
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}
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friend bool operator!=(const ElaboratingDIEIterator &a,
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const ElaboratingDIEIterator &b) {
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return !(a == b);
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}
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};
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llvm::iterator_range<ElaboratingDIEIterator>
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elaborating_dies(const DWARFDIE &die) {
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return llvm::make_range(ElaboratingDIEIterator(die),
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ElaboratingDIEIterator());
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}
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} // namespace
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DWARFDIE
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DWARFDIE::GetParent() const {
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if (IsValid())
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return DWARFDIE(m_cu, m_die->GetParent());
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else
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return DWARFDIE();
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}
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DWARFDIE
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DWARFDIE::GetFirstChild() const {
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if (IsValid())
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return DWARFDIE(m_cu, m_die->GetFirstChild());
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else
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return DWARFDIE();
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}
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DWARFDIE
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DWARFDIE::GetSibling() const {
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if (IsValid())
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return DWARFDIE(m_cu, m_die->GetSibling());
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else
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return DWARFDIE();
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}
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DWARFDIE
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DWARFDIE::GetReferencedDIE(const dw_attr_t attr) const {
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if (IsValid())
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return m_die->GetAttributeValueAsReference(GetCU(), attr);
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else
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return {};
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}
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DWARFDIE
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DWARFDIE::GetDIE(dw_offset_t die_offset) const {
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if (IsValid())
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return m_cu->GetDIE(die_offset);
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else
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return DWARFDIE();
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}
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DWARFDIE
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DWARFDIE::GetAttributeValueAsReferenceDIE(const dw_attr_t attr) const {
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if (IsValid()) {
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DWARFUnit *cu = GetCU();
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const bool check_specification_or_abstract_origin = true;
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DWARFFormValue form_value;
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if (m_die->GetAttributeValue(cu, attr, form_value, nullptr,
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check_specification_or_abstract_origin))
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return form_value.Reference();
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}
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return DWARFDIE();
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}
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DWARFDIE
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DWARFDIE::LookupDeepestBlock(lldb::addr_t address) const {
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if (!IsValid())
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return DWARFDIE();
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DWARFDIE result;
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bool check_children = false;
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bool match_addr_range = false;
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switch (Tag()) {
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case DW_TAG_class_type:
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case DW_TAG_namespace:
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case DW_TAG_structure_type:
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case DW_TAG_common_block:
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check_children = true;
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break;
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case DW_TAG_compile_unit:
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case DW_TAG_module:
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case DW_TAG_catch_block:
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case DW_TAG_subprogram:
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case DW_TAG_try_block:
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case DW_TAG_partial_unit:
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match_addr_range = true;
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break;
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case DW_TAG_lexical_block:
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case DW_TAG_inlined_subroutine:
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check_children = true;
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match_addr_range = true;
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break;
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default:
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break;
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}
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if (match_addr_range) {
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DWARFRangeList ranges;
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if (m_die->GetAttributeAddressRanges(m_cu, ranges,
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/*check_hi_lo_pc=*/true) &&
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ranges.FindEntryThatContains(address)) {
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check_children = true;
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switch (Tag()) {
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default:
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break;
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case DW_TAG_inlined_subroutine: // Inlined Function
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case DW_TAG_lexical_block: // Block { } in code
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result = *this;
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break;
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}
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} else {
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check_children = false;
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}
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}
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if (check_children) {
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for (DWARFDIE child = GetFirstChild(); child; child = child.GetSibling()) {
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if (DWARFDIE child_result = child.LookupDeepestBlock(address))
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return child_result;
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}
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}
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return result;
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}
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const char *DWARFDIE::GetMangledName() const {
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if (IsValid())
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return m_die->GetMangledName(m_cu);
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else
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return nullptr;
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}
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const char *DWARFDIE::GetPubname() const {
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if (IsValid())
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return m_die->GetPubname(m_cu);
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else
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return nullptr;
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}
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const char *DWARFDIE::GetQualifiedName(std::string &storage) const {
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if (IsValid())
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return m_die->GetQualifiedName(m_cu, storage);
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else
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return nullptr;
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}
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// GetName
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//
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// Get value of the DW_AT_name attribute and place that value into the supplied
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// stream object. If the DIE is a NULL object "NULL" is placed into the stream,
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// and if no DW_AT_name attribute exists for the DIE then nothing is printed.
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void DWARFDIE::GetName(Stream &s) const {
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if (!IsValid())
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return;
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if (GetDIE()->IsNULL()) {
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s.PutCString("NULL");
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return;
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}
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const char *name = GetDIE()->GetAttributeValueAsString(GetCU(), DW_AT_name, nullptr, true);
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if (!name)
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return;
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s.PutCString(name);
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}
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// AppendTypeName
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//
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// Follows the type name definition down through all needed tags to end up with
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// a fully qualified type name and dump the results to the supplied stream.
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// This is used to show the name of types given a type identifier.
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void DWARFDIE::AppendTypeName(Stream &s) const {
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if (!IsValid())
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return;
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if (GetDIE()->IsNULL()) {
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s.PutCString("NULL");
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return;
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}
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if (const char *name = GetPubname()) {
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s.PutCString(name);
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return;
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}
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switch (Tag()) {
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case DW_TAG_array_type:
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break; // print out a "[]" after printing the full type of the element
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// below
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case DW_TAG_base_type:
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s.PutCString("base ");
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break;
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case DW_TAG_class_type:
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s.PutCString("class ");
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break;
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case DW_TAG_const_type:
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s.PutCString("const ");
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break;
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case DW_TAG_enumeration_type:
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s.PutCString("enum ");
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break;
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case DW_TAG_file_type:
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s.PutCString("file ");
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break;
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case DW_TAG_interface_type:
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s.PutCString("interface ");
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break;
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case DW_TAG_packed_type:
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s.PutCString("packed ");
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break;
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case DW_TAG_pointer_type:
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break; // print out a '*' after printing the full type below
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case DW_TAG_ptr_to_member_type:
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break; // print out a '*' after printing the full type below
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case DW_TAG_reference_type:
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break; // print out a '&' after printing the full type below
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case DW_TAG_restrict_type:
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s.PutCString("restrict ");
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break;
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case DW_TAG_set_type:
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s.PutCString("set ");
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break;
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case DW_TAG_shared_type:
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s.PutCString("shared ");
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break;
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case DW_TAG_string_type:
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s.PutCString("string ");
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break;
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case DW_TAG_structure_type:
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s.PutCString("struct ");
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break;
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case DW_TAG_subrange_type:
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s.PutCString("subrange ");
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break;
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case DW_TAG_subroutine_type:
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s.PutCString("function ");
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break;
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case DW_TAG_thrown_type:
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s.PutCString("thrown ");
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break;
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case DW_TAG_union_type:
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s.PutCString("union ");
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break;
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case DW_TAG_unspecified_type:
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s.PutCString("unspecified ");
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break;
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case DW_TAG_volatile_type:
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s.PutCString("volatile ");
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break;
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default:
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return;
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}
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// Follow the DW_AT_type if possible
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if (DWARFDIE next_die = GetAttributeValueAsReferenceDIE(DW_AT_type))
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next_die.AppendTypeName(s);
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switch (Tag()) {
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case DW_TAG_array_type:
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s.PutCString("[]");
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break;
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case DW_TAG_pointer_type:
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s.PutChar('*');
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break;
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case DW_TAG_ptr_to_member_type:
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s.PutChar('*');
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break;
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case DW_TAG_reference_type:
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s.PutChar('&');
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break;
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default:
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break;
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}
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}
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lldb_private::Type *DWARFDIE::ResolveType() const {
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if (IsValid())
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return GetDWARF()->ResolveType(*this, true);
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else
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return nullptr;
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}
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lldb_private::Type *DWARFDIE::ResolveTypeUID(const DWARFDIE &die) const {
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if (SymbolFileDWARF *dwarf = GetDWARF())
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return dwarf->ResolveTypeUID(die, true);
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return nullptr;
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}
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std::vector<DWARFDIE> DWARFDIE::GetDeclContextDIEs() const {
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if (!IsValid())
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return {};
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std::vector<DWARFDIE> result;
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DWARFDIE parent = GetParentDeclContextDIE();
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while (parent.IsValid() && parent.GetDIE() != GetDIE()) {
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result.push_back(std::move(parent));
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parent = parent.GetParentDeclContextDIE();
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}
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return result;
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}
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void DWARFDIE::GetDeclContext(
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llvm::SmallVectorImpl<lldb_private::CompilerContext> &context) const {
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const dw_tag_t tag = Tag();
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if (tag == DW_TAG_compile_unit || tag == DW_TAG_partial_unit)
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return;
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DWARFDIE parent = GetParent();
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if (parent)
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parent.GetDeclContext(context);
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switch (tag) {
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case DW_TAG_module:
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context.push_back({CompilerContextKind::Module, ConstString(GetName())});
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break;
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case DW_TAG_namespace:
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context.push_back({CompilerContextKind::Namespace, ConstString(GetName())});
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break;
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case DW_TAG_structure_type:
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context.push_back({CompilerContextKind::Struct, ConstString(GetName())});
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break;
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case DW_TAG_union_type:
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context.push_back({CompilerContextKind::Union, ConstString(GetName())});
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break;
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case DW_TAG_class_type:
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context.push_back({CompilerContextKind::Class, ConstString(GetName())});
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break;
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case DW_TAG_enumeration_type:
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context.push_back({CompilerContextKind::Enum, ConstString(GetName())});
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break;
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case DW_TAG_subprogram:
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context.push_back(
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{CompilerContextKind::Function, ConstString(GetPubname())});
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break;
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case DW_TAG_variable:
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context.push_back(
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{CompilerContextKind::Variable, ConstString(GetPubname())});
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break;
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case DW_TAG_typedef:
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context.push_back({CompilerContextKind::Typedef, ConstString(GetName())});
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break;
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default:
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break;
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}
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}
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DWARFDIE
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DWARFDIE::GetParentDeclContextDIE() const {
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if (IsValid())
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return m_die->GetParentDeclContextDIE(m_cu);
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else
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return DWARFDIE();
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}
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bool DWARFDIE::IsStructUnionOrClass() const {
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const dw_tag_t tag = Tag();
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return tag == DW_TAG_class_type || tag == DW_TAG_structure_type ||
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tag == DW_TAG_union_type;
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}
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bool DWARFDIE::IsMethod() const {
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for (DWARFDIE d : elaborating_dies(*this))
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if (d.GetParent().IsStructUnionOrClass())
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return true;
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return false;
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}
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bool DWARFDIE::GetDIENamesAndRanges(
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const char *&name, const char *&mangled, DWARFRangeList &ranges,
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int &decl_file, int &decl_line, int &decl_column, int &call_file,
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int &call_line, int &call_column,
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lldb_private::DWARFExpression *frame_base) const {
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if (IsValid()) {
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return m_die->GetDIENamesAndRanges(
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GetCU(), name, mangled, ranges, decl_file, decl_line, decl_column,
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call_file, call_line, call_column, frame_base);
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} else
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return false;
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}
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