DWARFDebugInfoEntry.cpp | Explore in Territory

//===-- DWARFDebugInfoEntry.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 "DWARFDebugInfoEntry.h"

#include <cassert>

#include <algorithm>
#include <limits>
#include <optional>

#include "llvm/Support/LEB128.h"

#include "lldb/Core/Module.h"
#include "lldb/Expression/DWARFExpression.h"
#include "lldb/Symbol/ObjectFile.h"
#include "lldb/Utility/Stream.h"
#include "lldb/Utility/StreamString.h"

#include "DWARFCompileUnit.h"
#include "DWARFDebugAranges.h"
#include "DWARFDebugInfo.h"
#include "DWARFDebugRanges.h"
#include "DWARFDeclContext.h"
#include "DWARFFormValue.h"
#include "DWARFUnit.h"
#include "SymbolFileDWARF.h"
#include "SymbolFileDWARFDwo.h"

#include "llvm/DebugInfo/DWARF/DWARFDebugAbbrev.h"

usingnamespacelldb_private;
usingnamespacelldb_private::dwarf;
usingnamespacelldb_private::plugin::dwarf;
extern int g_verbose;

// Extract a debug info entry for a given DWARFUnit from the data
// starting at the offset in offset_ptr
bool DWARFDebugInfoEntry::Extract(const DWARFDataExtractor &data,
                                  const DWARFUnit &unit,
                                  lldb::offset_t *offset_ptr) { … }

static DWARFRangeList GetRangesOrReportError(DWARFUnit &unit,
                                             const DWARFDebugInfoEntry &die,
                                             const DWARFFormValue &value) { … }

static void ExtractAttrAndFormValue(
    const llvm::DWARFAbbreviationDeclaration::AttributeSpec &attr_spec,
    dw_attr_t &attr, DWARFFormValue &form_value) { … }

// GetDIENamesAndRanges
//
// Gets the valid address ranges for a given DIE by looking for a
// DW_AT_low_pc/DW_AT_high_pc pair, DW_AT_entry_pc, or DW_AT_ranges attributes.
bool DWARFDebugInfoEntry::GetDIENamesAndRanges(
    DWARFUnit *cu, const char *&name, const char *&mangled,
    DWARFRangeList &ranges, std::optional<int> &decl_file,
    std::optional<int> &decl_line, std::optional<int> &decl_column,
    std::optional<int> &call_file, std::optional<int> &call_line,
    std::optional<int> &call_column, DWARFExpressionList *frame_base) const { … }

// Get all attribute values for a given DIE, including following any
// specification or abstract origin attributes and including those in the
// results. Any duplicate attributes will have the first instance take
// precedence (this can happen for declaration attributes).
void DWARFDebugInfoEntry::GetAttributes(DWARFUnit *cu,
                                        DWARFAttributes &attributes,
                                        Recurse recurse,
                                        uint32_t curr_depth) const { … }

// GetAttributeValue
//
// Get the value of an attribute and return the .debug_info or .debug_types
// offset of the attribute if it was properly extracted into form_value,
// or zero if we fail since an offset of zero is invalid for an attribute (it
// would be a compile unit header).
dw_offset_t DWARFDebugInfoEntry::GetAttributeValue(
    const DWARFUnit *cu, const dw_attr_t attr, DWARFFormValue &form_value,
    dw_offset_t *end_attr_offset_ptr, bool check_elaborating_dies) const { … }

// GetAttributeValueAsString
//
// Get the value of an attribute as a string return it. The resulting pointer
// to the string data exists within the supplied SymbolFileDWARF and will only
// be available as long as the SymbolFileDWARF is still around and it's content
// doesn't change.
const char *DWARFDebugInfoEntry::GetAttributeValueAsString(
    const DWARFUnit *cu, const dw_attr_t attr, const char *fail_value,
    bool check_elaborating_dies) const { … }

// GetAttributeValueAsUnsigned
//
// Get the value of an attribute as unsigned and return it.
uint64_t DWARFDebugInfoEntry::GetAttributeValueAsUnsigned(
    const DWARFUnit *cu, const dw_attr_t attr, uint64_t fail_value,
    bool check_elaborating_dies) const { … }

std::optional<uint64_t>
DWARFDebugInfoEntry::GetAttributeValueAsOptionalUnsigned(
    const DWARFUnit *cu, const dw_attr_t attr,
    bool check_elaborating_dies) const { … }

// GetAttributeValueAsReference
//
// Get the value of an attribute as reference and fix up and compile unit
// relative offsets as needed.
DWARFDIE DWARFDebugInfoEntry::GetAttributeValueAsReference(
    const DWARFUnit *cu, const dw_attr_t attr,
    bool check_elaborating_dies) const { … }

uint64_t DWARFDebugInfoEntry::GetAttributeValueAsAddress(
    const DWARFUnit *cu, const dw_attr_t attr, uint64_t fail_value,
    bool check_elaborating_dies) const { … }

// GetAttributeHighPC
//
// Get the hi_pc, adding hi_pc to lo_pc when specified as an <offset-from-low-
// pc>.
//
// Returns the hi_pc or fail_value.
dw_addr_t
DWARFDebugInfoEntry::GetAttributeHighPC(const DWARFUnit *cu, dw_addr_t lo_pc,
                                        uint64_t fail_value,
                                        bool check_elaborating_dies) const { … }

// GetAttributeAddressRange
//
// Get the lo_pc and hi_pc, adding hi_pc to lo_pc when specified as an <offset-
// from-low-pc>.
//
// Returns true or sets lo_pc and hi_pc to fail_value.
bool DWARFDebugInfoEntry::GetAttributeAddressRange(
    const DWARFUnit *cu, dw_addr_t &lo_pc, dw_addr_t &hi_pc,
    uint64_t fail_value, bool check_elaborating_dies) const { … }

DWARFRangeList DWARFDebugInfoEntry::GetAttributeAddressRanges(
    DWARFUnit *cu, bool check_hi_lo_pc, bool check_elaborating_dies) const { … }

// GetName
//
// Get value of the DW_AT_name attribute and return it if one exists, else
// return NULL.
const char *DWARFDebugInfoEntry::GetName(const DWARFUnit *cu) const { … }

// GetMangledName
//
// Get value of the DW_AT_MIPS_linkage_name attribute and return it if one
// exists, else return the value of the DW_AT_name attribute
const char *
DWARFDebugInfoEntry::GetMangledName(const DWARFUnit *cu,
                                    bool substitute_name_allowed) const { … }

// GetPubname
//
// Get value the name for a DIE as it should appear for a .debug_pubnames or
// .debug_pubtypes section.
const char *DWARFDebugInfoEntry::GetPubname(const DWARFUnit *cu) const { … }

/// This function is builds a table very similar to the standard .debug_aranges
/// table, except that the actual DIE offset for the function is placed in the
/// table instead of the compile unit offset.
void DWARFDebugInfoEntry::BuildFunctionAddressRangeTable(
    DWARFUnit *cu, DWARFDebugAranges *debug_aranges) const { … }

lldb::offset_t DWARFDebugInfoEntry::GetFirstAttributeOffset() const { … }

const llvm::DWARFAbbreviationDeclaration *
DWARFDebugInfoEntry::GetAbbreviationDeclarationPtr(const DWARFUnit *cu) const { … }

bool DWARFDebugInfoEntry::IsGlobalOrStaticScopeVariable() const { … }

bool DWARFDebugInfoEntry::operator==(const DWARFDebugInfoEntry &rhs) const { … }

bool DWARFDebugInfoEntry::operator!=(const DWARFDebugInfoEntry &rhs) const { … }
llvm/lldb/source/Plugins/SymbolFile/DWARF/DWARFDebugInfoEntry.cpp
