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clang-p2996/lldb/source/Plugins/SymbolFile/DWARF/DWARFDebugInfoEntry.cpp
Greg Clayton 109f86860a Fix issues with GCC debugging. GCC emits DWARF in unique ways that LLDB wasn't handling. This fix will fix cases where classes are forward declared using DW_TAG_structure_type and then actually defined using DW_TAG_class_type. LLDB, when it finds a forward declaration, would try and find and parse the complete type. It does this by: 
1 - looking up the type basename in the type index
2 - iterate through all matches and look for decl contexts (namespace/class hierarchy) that match

The issue was the decl context matching wasn't watching for DW_TAG_class_type/DW_TAG_structure_type mismatches, and it wasn't also getting the name for DIE's that didn't have a DW_AT_name, but did have a DW_AT_specification that had a name.

llvm-svn: 186347
2013-07-15 21:10:17 +00:00

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81 KiB
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//===-- DWARFDebugInfoEntry.cpp ---------------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "DWARFDebugInfoEntry.h"
#include <assert.h>
#include <algorithm>
#include "lldb/Core/Module.h"
#include "lldb/Core/Stream.h"
#include "lldb/Expression/DWARFExpression.h"
#include "lldb/Symbol/ObjectFile.h"
#include "DWARFCompileUnit.h"
#include "SymbolFileDWARF.h"
#include "DWARFDebugAbbrev.h"
#include "DWARFDebugAranges.h"
#include "DWARFDebugInfo.h"
#include "DWARFDeclContext.h"
#include "DWARFDIECollection.h"
#include "DWARFFormValue.h"
#include "DWARFLocationDescription.h"
#include "DWARFLocationList.h"
#include "DWARFDebugRanges.h"
using namespace lldb_private;
using namespace std;
extern int g_verbose;
DWARFDebugInfoEntry::Attributes::Attributes() :
m_infos()
{
}
DWARFDebugInfoEntry::Attributes::~Attributes()
{
}
uint32_t
DWARFDebugInfoEntry::Attributes::FindAttributeIndex(dw_attr_t attr) const
{
collection::const_iterator end = m_infos.end();
collection::const_iterator beg = m_infos.begin();
collection::const_iterator pos;
for (pos = beg; pos != end; ++pos)
{
if (pos->attr == attr)
return std::distance(beg, pos);
}
return UINT32_MAX;
}
void
DWARFDebugInfoEntry::Attributes::Append(const DWARFCompileUnit *cu, dw_offset_t attr_die_offset, dw_attr_t attr, dw_form_t form)
{
Info info = { cu, attr_die_offset, attr, form };
m_infos.push_back(info);
}
bool
DWARFDebugInfoEntry::Attributes::ContainsAttribute(dw_attr_t attr) const
{
return FindAttributeIndex(attr) != UINT32_MAX;
}
bool
DWARFDebugInfoEntry::Attributes::RemoveAttribute(dw_attr_t attr)
{
uint32_t attr_index = FindAttributeIndex(attr);
if (attr_index != UINT32_MAX)
{
m_infos.erase(m_infos.begin() + attr_index);
return true;
}
return false;
}
bool
DWARFDebugInfoEntry::Attributes::ExtractFormValueAtIndex (SymbolFileDWARF* dwarf2Data, uint32_t i, DWARFFormValue &form_value) const
{
form_value.SetForm(FormAtIndex(i));
lldb::offset_t offset = DIEOffsetAtIndex(i);
return form_value.ExtractValue(dwarf2Data->get_debug_info_data(), &offset, CompileUnitAtIndex(i));
}
uint64_t
DWARFDebugInfoEntry::Attributes::FormValueAsUnsigned (SymbolFileDWARF* dwarf2Data, dw_attr_t attr, uint64_t fail_value) const
{
const uint32_t attr_idx = FindAttributeIndex (attr);
if (attr_idx != UINT32_MAX)
return FormValueAsUnsignedAtIndex (dwarf2Data, attr_idx, fail_value);
return fail_value;
}
uint64_t
DWARFDebugInfoEntry::Attributes::FormValueAsUnsignedAtIndex(SymbolFileDWARF* dwarf2Data, uint32_t i, uint64_t fail_value) const
{
DWARFFormValue form_value;
if (ExtractFormValueAtIndex(dwarf2Data, i, form_value))
return form_value.Reference(CompileUnitAtIndex(i));
return fail_value;
}
bool
DWARFDebugInfoEntry::FastExtract
(
const DataExtractor& debug_info_data,
const DWARFCompileUnit* cu,
const uint8_t *fixed_form_sizes,
lldb::offset_t *offset_ptr
)
{
m_offset = *offset_ptr;
m_parent_idx = 0;
m_sibling_idx = 0;
m_empty_children = false;
const uint64_t abbr_idx = debug_info_data.GetULEB128 (offset_ptr);
assert (abbr_idx < (1 << DIE_ABBR_IDX_BITSIZE));
m_abbr_idx = abbr_idx;
//assert (fixed_form_sizes); // For best performance this should be specified!
if (m_abbr_idx)
{
lldb::offset_t offset = *offset_ptr;
const DWARFAbbreviationDeclaration *abbrevDecl = cu->GetAbbreviations()->GetAbbreviationDeclaration(m_abbr_idx);
if (abbrevDecl == NULL)
{
cu->GetSymbolFileDWARF()->GetObjectFile()->GetModule()->ReportError ("{0x%8.8x}: invalid abbreviation code %u, please file a bug and attach the file at the start of this error message",
m_offset,
(unsigned)abbr_idx);
// WE can't parse anymore if the DWARF is borked...
*offset_ptr = UINT32_MAX;
return false;
}
m_tag = abbrevDecl->Tag();
m_has_children = abbrevDecl->HasChildren();
// Skip all data in the .debug_info for the attributes
const uint32_t numAttributes = abbrevDecl->NumAttributes();
register uint32_t i;
register dw_form_t form;
for (i=0; i<numAttributes; ++i)
{
form = abbrevDecl->GetFormByIndexUnchecked(i);
const uint8_t fixed_skip_size = fixed_form_sizes [form];
if (fixed_skip_size)
offset += fixed_skip_size;
else
{
bool form_is_indirect = false;
do
{
form_is_indirect = false;
register uint32_t form_size = 0;
switch (form)
{
// Blocks if inlined data that have a length field and the data bytes
// inlined in the .debug_info
case DW_FORM_exprloc :
case DW_FORM_block : form_size = debug_info_data.GetULEB128 (&offset); break;
case DW_FORM_block1 : form_size = debug_info_data.GetU8_unchecked (&offset); break;
case DW_FORM_block2 : form_size = debug_info_data.GetU16_unchecked (&offset);break;
case DW_FORM_block4 : form_size = debug_info_data.GetU32_unchecked (&offset);break;
// Inlined NULL terminated C-strings
case DW_FORM_string :
debug_info_data.GetCStr (&offset);
break;
// Compile unit address sized values
case DW_FORM_addr :
form_size = cu->GetAddressByteSize();
break;
case DW_FORM_ref_addr :
if (cu->GetVersion() <= 2)
form_size = cu->GetAddressByteSize();
else
form_size = 4; // 4 bytes for DWARF 32, 8 bytes for DWARF 64, but we don't support DWARF64 yet
break;
// 0 sized form
case DW_FORM_flag_present:
form_size = 0;
break;
// 1 byte values
case DW_FORM_data1 :
case DW_FORM_flag :
case DW_FORM_ref1 :
form_size = 1;
break;
// 2 byte values
case DW_FORM_data2 :
case DW_FORM_ref2 :
form_size = 2;
break;
// 4 byte values
case DW_FORM_strp :
case DW_FORM_data4 :
case DW_FORM_ref4 :
form_size = 4;
break;
// 8 byte values
case DW_FORM_data8 :
case DW_FORM_ref8 :
case DW_FORM_ref_sig8 :
form_size = 8;
break;
// signed or unsigned LEB 128 values
case DW_FORM_sdata :
case DW_FORM_udata :
case DW_FORM_ref_udata :
debug_info_data.Skip_LEB128 (&offset);
break;
case DW_FORM_indirect :
form_is_indirect = true;
form = debug_info_data.GetULEB128 (&offset);
break;
case DW_FORM_sec_offset :
if (cu->GetAddressByteSize () == 4)
debug_info_data.GetU32 (offset_ptr);
else
debug_info_data.GetU64 (offset_ptr);
break;
default:
*offset_ptr = m_offset;
return false;
}
offset += form_size;
} while (form_is_indirect);
}
}
*offset_ptr = offset;
return true;
}
else
{
m_tag = 0;
m_has_children = false;
return true; // NULL debug tag entry
}
return false;
}
//----------------------------------------------------------------------
// Extract
//
// Extract a debug info entry for a given compile unit from the
// .debug_info and .debug_abbrev data within the SymbolFileDWARF class
// starting at the given offset
//----------------------------------------------------------------------
bool
DWARFDebugInfoEntry::Extract
(
SymbolFileDWARF* dwarf2Data,
const DWARFCompileUnit* cu,
lldb::offset_t *offset_ptr
)
{
const DataExtractor& debug_info_data = dwarf2Data->get_debug_info_data();
// const DataExtractor& debug_str_data = dwarf2Data->get_debug_str_data();
const uint32_t cu_end_offset = cu->GetNextCompileUnitOffset();
const uint8_t cu_addr_size = cu->GetAddressByteSize();
lldb::offset_t offset = *offset_ptr;
// if (offset >= cu_end_offset)
// Log::Error("DIE at offset 0x%8.8x is beyond the end of the current compile unit (0x%8.8x)", m_offset, cu_end_offset);
if ((offset < cu_end_offset) && debug_info_data.ValidOffset(offset))
{
m_offset = offset;
const uint64_t abbr_idx = debug_info_data.GetULEB128(&offset);
assert (abbr_idx < (1 << DIE_ABBR_IDX_BITSIZE));
m_abbr_idx = abbr_idx;
if (abbr_idx)
{
const DWARFAbbreviationDeclaration *abbrevDecl = cu->GetAbbreviations()->GetAbbreviationDeclaration(abbr_idx);
if (abbrevDecl)
{
m_tag = abbrevDecl->Tag();
m_has_children = abbrevDecl->HasChildren();
bool isCompileUnitTag = m_tag == DW_TAG_compile_unit;
if (cu && isCompileUnitTag)
((DWARFCompileUnit*)cu)->SetBaseAddress(0);
// Skip all data in the .debug_info for the attributes
const uint32_t numAttributes = abbrevDecl->NumAttributes();
uint32_t i;
dw_attr_t attr;
dw_form_t form;
for (i=0; i<numAttributes; ++i)
{
abbrevDecl->GetAttrAndFormByIndexUnchecked(i, attr, form);
if (isCompileUnitTag && ((attr == DW_AT_entry_pc) || (attr == DW_AT_low_pc)))
{
DWARFFormValue form_value(form);
if (form_value.ExtractValue(debug_info_data, &offset, cu))
{
if (attr == DW_AT_low_pc || attr == DW_AT_entry_pc)
((DWARFCompileUnit*)cu)->SetBaseAddress(form_value.Unsigned());
}
}
else
{
bool form_is_indirect = false;
do
{
form_is_indirect = false;
register uint32_t form_size = 0;
switch (form)
{
// Blocks if inlined data that have a length field and the data bytes
// inlined in the .debug_info
case DW_FORM_exprloc :
case DW_FORM_block : form_size = debug_info_data.GetULEB128(&offset); break;
case DW_FORM_block1 : form_size = debug_info_data.GetU8(&offset); break;
case DW_FORM_block2 : form_size = debug_info_data.GetU16(&offset); break;
case DW_FORM_block4 : form_size = debug_info_data.GetU32(&offset); break;
// Inlined NULL terminated C-strings
case DW_FORM_string : debug_info_data.GetCStr(&offset); break;
// Compile unit address sized values
case DW_FORM_addr :
form_size = cu_addr_size;
break;
case DW_FORM_ref_addr :
if (cu->GetVersion() <= 2)
form_size = cu_addr_size;
else
form_size = 4; // 4 bytes for DWARF 32, 8 bytes for DWARF 64, but we don't support DWARF64 yet
break;
// 0 sized form
case DW_FORM_flag_present:
form_size = 0;
break;
// 1 byte values
case DW_FORM_data1 :
case DW_FORM_flag :
case DW_FORM_ref1 :
form_size = 1;
break;
// 2 byte values
case DW_FORM_data2 :
case DW_FORM_ref2 :
form_size = 2;
break;
// 4 byte values
case DW_FORM_strp :
form_size = 4;
break;
case DW_FORM_data4 :
case DW_FORM_ref4 :
form_size = 4;
break;
// 8 byte values
case DW_FORM_data8 :
case DW_FORM_ref8 :
case DW_FORM_ref_sig8 :
form_size = 8;
break;
// signed or unsigned LEB 128 values
case DW_FORM_sdata :
case DW_FORM_udata :
case DW_FORM_ref_udata :
debug_info_data.Skip_LEB128(&offset);
break;
case DW_FORM_indirect :
form = debug_info_data.GetULEB128(&offset);
form_is_indirect = true;
break;
case DW_FORM_sec_offset :
if (cu->GetAddressByteSize () == 4)
debug_info_data.GetU32 (offset_ptr);
else
debug_info_data.GetU64 (offset_ptr);
break;
default:
*offset_ptr = offset;
return false;
}
offset += form_size;
} while (form_is_indirect);
}
}
*offset_ptr = offset;
return true;
}
}
else
{
m_tag = 0;
m_has_children = false;
*offset_ptr = offset;
return true; // NULL debug tag entry
}
}
return false;
}
//----------------------------------------------------------------------
// DumpAncestry
//
// Dumps all of a debug information entries parents up until oldest and
// all of it's attributes to the specified stream.
//----------------------------------------------------------------------
void
DWARFDebugInfoEntry::DumpAncestry
(
SymbolFileDWARF* dwarf2Data,
const DWARFCompileUnit* cu,
const DWARFDebugInfoEntry* oldest,
Stream &s,
uint32_t recurse_depth
) const
{
const DWARFDebugInfoEntry* parent = GetParent();
if (parent && parent != oldest)
parent->DumpAncestry(dwarf2Data, cu, oldest, s, 0);
Dump(dwarf2Data, cu, s, recurse_depth);
}
//----------------------------------------------------------------------
// Compare two DIE by comparing all their attributes values, and
// following all DW_FORM_ref attributes and comparing their contents as
// well (except for DW_AT_sibling attributes.
//
// DWARFDebugInfoEntry::CompareState compare_state;
// int result = DWARFDebugInfoEntry::Compare(this, 0x00017ccb, 0x0001eb2b, compare_state, false, true);
//----------------------------------------------------------------------
//int
//DWARFDebugInfoEntry::Compare
//(
// SymbolFileDWARF* dwarf2Data,
// dw_offset_t a_die_offset,
// dw_offset_t b_die_offset,
// CompareState &compare_state,
// bool compare_siblings,
// bool compare_children
//)
//{
// if (a_die_offset == b_die_offset)
// return 0;
//
// DWARFCompileUnitSP a_cu_sp;
// DWARFCompileUnitSP b_cu_sp;
// const DWARFDebugInfoEntry* a_die = dwarf2Data->DebugInfo()->GetDIEPtr(a_die_offset, &a_cu_sp);
// const DWARFDebugInfoEntry* b_die = dwarf2Data->DebugInfo()->GetDIEPtr(b_die_offset, &b_cu_sp);
//
// return Compare(dwarf2Data, a_cu_sp.get(), a_die, b_cu_sp.get(), b_die, compare_state, compare_siblings, compare_children);
//}
//
//int
//DWARFDebugInfoEntry::Compare
//(
// SymbolFileDWARF* dwarf2Data,
// DWARFCompileUnit* a_cu, const DWARFDebugInfoEntry* a_die,
// DWARFCompileUnit* b_cu, const DWARFDebugInfoEntry* b_die,
// CompareState &compare_state,
// bool compare_siblings,
// bool compare_children
//)
//{
// if (a_die == b_die)
// return 0;
//
// if (!compare_state.AddTypePair(a_die->GetOffset(), b_die->GetOffset()))
// {
// // We are already comparing both of these types, so let
// // compares complete for the real result
// return 0;
// }
//
// //printf("DWARFDebugInfoEntry::Compare(0x%8.8x, 0x%8.8x)\n", a_die->GetOffset(), b_die->GetOffset());
//
// // Do we have two valid DIEs?
// if (a_die && b_die)
// {
// // Both DIE are valid
// int result = 0;
//
// const dw_tag_t a_tag = a_die->Tag();
// const dw_tag_t b_tag = b_die->Tag();
// if (a_tag == 0 && b_tag == 0)
// return 0;
//
// //printf(" comparing tags: %s and %s\n", DW_TAG_value_to_name(a_tag), DW_TAG_value_to_name(b_tag));
//
// if (a_tag < b_tag)
// return -1;
// else if (a_tag > b_tag)
// return 1;
//
// DWARFDebugInfoEntry::Attributes a_attrs;
// DWARFDebugInfoEntry::Attributes b_attrs;
// size_t a_attr_count = a_die->GetAttributes(dwarf2Data, a_cu, a_attrs);
// size_t b_attr_count = b_die->GetAttributes(dwarf2Data, b_cu, b_attrs);
// if (a_attr_count != b_attr_count)
// {
// a_attrs.RemoveAttribute(DW_AT_sibling);
// b_attrs.RemoveAttribute(DW_AT_sibling);
// }
//
// a_attr_count = a_attrs.Size();
// b_attr_count = b_attrs.Size();
//
// DWARFFormValue a_form_value;
// DWARFFormValue b_form_value;
//
// if (a_attr_count != b_attr_count)
// {
// uint32_t is_decl_index = a_attrs.FindAttributeIndex(DW_AT_declaration);
// uint32_t a_name_index = UINT32_MAX;
// uint32_t b_name_index = UINT32_MAX;
// if (is_decl_index != UINT32_MAX)
// {
// if (a_attr_count == 2)
// {
// a_name_index = a_attrs.FindAttributeIndex(DW_AT_name);
// b_name_index = b_attrs.FindAttributeIndex(DW_AT_name);
// }
// }
// else
// {
// is_decl_index = b_attrs.FindAttributeIndex(DW_AT_declaration);
// if (is_decl_index != UINT32_MAX && a_attr_count == 2)
// {
// a_name_index = a_attrs.FindAttributeIndex(DW_AT_name);
// b_name_index = b_attrs.FindAttributeIndex(DW_AT_name);
// }
// }
// if (a_name_index != UINT32_MAX && b_name_index != UINT32_MAX)
// {
// if (a_attrs.ExtractFormValueAtIndex(dwarf2Data, a_name_index, a_form_value) &&
// b_attrs.ExtractFormValueAtIndex(dwarf2Data, b_name_index, b_form_value))
// {
// result = DWARFFormValue::Compare (a_form_value, b_form_value, a_cu, b_cu, &dwarf2Data->get_debug_str_data());
// if (result == 0)
// {
// a_attr_count = b_attr_count = 0;
// compare_children = false;
// }
// }
// }
// }
//
// if (a_attr_count < b_attr_count)
// return -1;
// if (a_attr_count > b_attr_count)
// return 1;
//
//
// // The number of attributes are the same...
// if (a_attr_count > 0)
// {
// const DataExtractor* debug_str_data_ptr = &dwarf2Data->get_debug_str_data();
//
// uint32_t i;
// for (i=0; i<a_attr_count; ++i)
// {
// const dw_attr_t a_attr = a_attrs.AttributeAtIndex(i);
// const dw_attr_t b_attr = b_attrs.AttributeAtIndex(i);
// //printf(" comparing attributes\n\t\t0x%8.8x: %s %s\t\t0x%8.8x: %s %s\n",
// // a_attrs.DIEOffsetAtIndex(i), DW_FORM_value_to_name(a_attrs.FormAtIndex(i)), DW_AT_value_to_name(a_attr),
// // b_attrs.DIEOffsetAtIndex(i), DW_FORM_value_to_name(b_attrs.FormAtIndex(i)), DW_AT_value_to_name(b_attr));
//
// if (a_attr < b_attr)
// return -1;
// else if (a_attr > b_attr)
// return 1;
//
// switch (a_attr)
// {
// // Since we call a form of GetAttributes which inlines the
// // attributes from DW_AT_abstract_origin and DW_AT_specification
// // we don't care if their values mismatch...
// case DW_AT_abstract_origin:
// case DW_AT_specification:
// case DW_AT_sibling:
// case DW_AT_containing_type:
// //printf(" action = IGNORE\n");
// result = 0;
// break; // ignore
//
// default:
// if (a_attrs.ExtractFormValueAtIndex(dwarf2Data, i, a_form_value) &&
// b_attrs.ExtractFormValueAtIndex(dwarf2Data, i, b_form_value))
// result = DWARFFormValue::Compare (a_form_value, b_form_value, a_cu, b_cu, debug_str_data_ptr);
// break;
// }
//
// //printf("\t result = %i\n", result);
//
// if (result != 0)
// {
// // Attributes weren't equal, lets see if we care?
// switch (a_attr)
// {
// case DW_AT_decl_file:
// // TODO: add the ability to compare files in two different compile units
// if (a_cu == b_cu)
// {
// //printf(" action = RETURN RESULT\n");
// return result; // Only return the compare results when the compile units are the same and the decl_file attributes can be compared
// }
// else
// {
// result = 0;
// //printf(" action = IGNORE\n");
// }
// break;
//
// default:
// switch (a_attrs.FormAtIndex(i))
// {
// case DW_FORM_ref1:
// case DW_FORM_ref2:
// case DW_FORM_ref4:
// case DW_FORM_ref8:
// case DW_FORM_ref_udata:
// case DW_FORM_ref_addr:
// //printf(" action = COMPARE DIEs 0x%8.8x 0x%8.8x\n", (dw_offset_t)a_form_value.Reference(a_cu), (dw_offset_t)b_form_value.Reference(b_cu));
// // These attribute values refer to other DIEs, so lets compare those instead of their DIE offsets...
// result = Compare(dwarf2Data, a_form_value.Reference(a_cu), b_form_value.Reference(b_cu), compare_state, false, true);
// if (result != 0)
// return result;
// break;
//
// default:
// // We do care that they were different, return this result...
// //printf(" action = RETURN RESULT\n");
// return result;
// }
// }
// }
// }
// }
// //printf(" SUCCESS\n\t\t0x%8.8x: %s\n\t\t0x%8.8x: %s\n", a_die->GetOffset(), DW_TAG_value_to_name(a_tag), b_die->GetOffset(), DW_TAG_value_to_name(b_tag));
//
// if (compare_children)
// {
// bool a_has_children = a_die->HasChildren();
// bool b_has_children = b_die->HasChildren();
// if (a_has_children == b_has_children)
// {
// // Both either have kids or don't
// if (a_has_children)
// result = Compare( dwarf2Data,
// a_cu, a_die->GetFirstChild(),
// b_cu, b_die->GetFirstChild(),
// compare_state, true, compare_children);
// else
// result = 0;
// }
// else if (!a_has_children)
// result = -1; // A doesn't have kids, but B does
// else
// result = 1; // A has kids, but B doesn't
// }
//
// if (compare_siblings)
// {
// result = Compare( dwarf2Data,
// a_cu, a_die->GetSibling(),
// b_cu, b_die->GetSibling(),
// compare_state, true, compare_children);
// }
//
// return result;
// }
//
// if (a_die == NULL)
// return -1; // a_die is NULL, yet b_die is non-NULL
// else
// return 1; // a_die is non-NULL, yet b_die is NULL
//
//}
//
//
//int
//DWARFDebugInfoEntry::Compare
//(
// SymbolFileDWARF* dwarf2Data,
// const DWARFCompileUnit* cu_a,
// const DWARFDebugInfoEntry* die_a,
// const DWARFCompileUnit* cu_a,
// const DWARFDebugInfoEntry* die_b,
// CompareState &compare_state
//)
//{
//}
//----------------------------------------------------------------------
// 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
(
SymbolFileDWARF* dwarf2Data,
const DWARFCompileUnit* cu,
const char * &name,
const char * &mangled,
DWARFDebugRanges::RangeList& ranges,
int& decl_file,
int& decl_line,
int& decl_column,
int& call_file,
int& call_line,
int& call_column,
DWARFExpression *frame_base
) const
{
if (dwarf2Data == NULL)
return false;
dw_addr_t lo_pc = LLDB_INVALID_ADDRESS;
dw_addr_t hi_pc = LLDB_INVALID_ADDRESS;
std::vector<dw_offset_t> die_offsets;
bool set_frame_base_loclist_addr = false;
lldb::offset_t offset;
const DWARFAbbreviationDeclaration* abbrevDecl = GetAbbreviationDeclarationPtr(dwarf2Data, cu, offset);
if (abbrevDecl)
{
const DataExtractor& debug_info_data = dwarf2Data->get_debug_info_data();
if (!debug_info_data.ValidOffset(offset))
return false;
const uint32_t numAttributes = abbrevDecl->NumAttributes();
uint32_t i;
dw_attr_t attr;
dw_form_t form;
for (i=0; i<numAttributes; ++i)
{
abbrevDecl->GetAttrAndFormByIndexUnchecked(i, attr, form);
DWARFFormValue form_value(form);
if (form_value.ExtractValue(debug_info_data, &offset, cu))
{
switch (attr)
{
case DW_AT_low_pc:
case DW_AT_entry_pc:
lo_pc = form_value.Unsigned();
break;
case DW_AT_high_pc:
hi_pc = form_value.Unsigned();
break;
case DW_AT_ranges:
{
const DWARFDebugRanges* debug_ranges = dwarf2Data->DebugRanges();
debug_ranges->FindRanges(form_value.Unsigned(), ranges);
// All DW_AT_ranges are relative to the base address of the
// compile unit. We add the compile unit base address to make
// sure all the addresses are properly fixed up.
ranges.Slide(cu->GetBaseAddress());
}
break;
case DW_AT_name:
if (name == NULL)
name = form_value.AsCString(&dwarf2Data->get_debug_str_data());
break;
case DW_AT_MIPS_linkage_name:
case DW_AT_linkage_name:
if (mangled == NULL)
mangled = form_value.AsCString(&dwarf2Data->get_debug_str_data());
break;
case DW_AT_abstract_origin:
die_offsets.push_back(form_value.Reference(cu));
break;
case DW_AT_specification:
die_offsets.push_back(form_value.Reference(cu));
break;
case DW_AT_decl_file:
if (decl_file == 0)
decl_file = form_value.Unsigned();
break;
case DW_AT_decl_line:
if (decl_line == 0)
decl_line = form_value.Unsigned();
break;
case DW_AT_decl_column:
if (decl_column == 0)
decl_column = form_value.Unsigned();
break;
case DW_AT_call_file:
if (call_file == 0)
call_file = form_value.Unsigned();
break;
case DW_AT_call_line:
if (call_line == 0)
call_line = form_value.Unsigned();
break;
case DW_AT_call_column:
if (call_column == 0)
call_column = form_value.Unsigned();
break;
case DW_AT_frame_base:
if (frame_base)
{
if (form_value.BlockData())
{
uint32_t block_offset = form_value.BlockData() - debug_info_data.GetDataStart();
uint32_t block_length = form_value.Unsigned();
frame_base->SetOpcodeData(debug_info_data, block_offset, block_length);
}
else
{
const DataExtractor &debug_loc_data = dwarf2Data->get_debug_loc_data();
const dw_offset_t debug_loc_offset = form_value.Unsigned();
size_t loc_list_length = DWARFLocationList::Size(debug_loc_data, debug_loc_offset);
if (loc_list_length > 0)
{
frame_base->SetOpcodeData(debug_loc_data, debug_loc_offset, loc_list_length);
if (lo_pc != LLDB_INVALID_ADDRESS)
{
assert (lo_pc >= cu->GetBaseAddress());
frame_base->SetLocationListSlide(lo_pc - cu->GetBaseAddress());
}
else
{
set_frame_base_loclist_addr = true;
}
}
}
}
break;
default:
break;
}
}
}
}
if (ranges.IsEmpty())
{
if (lo_pc != LLDB_INVALID_ADDRESS)
{
if (hi_pc != LLDB_INVALID_ADDRESS && hi_pc > lo_pc)
ranges.Append(DWARFDebugRanges::Range (lo_pc, hi_pc - lo_pc));
else
ranges.Append(DWARFDebugRanges::Range (lo_pc, 0));
}
}
if (set_frame_base_loclist_addr)
{
dw_addr_t lowest_range_pc = ranges.GetMinRangeBase(0);
assert (lowest_range_pc >= cu->GetBaseAddress());
frame_base->SetLocationListSlide (lowest_range_pc - cu->GetBaseAddress());
}
if (ranges.IsEmpty() || name == NULL || mangled == NULL)
{
std::vector<dw_offset_t>::const_iterator pos;
std::vector<dw_offset_t>::const_iterator end = die_offsets.end();
for (pos = die_offsets.begin(); pos != end; ++pos)
{
DWARFCompileUnitSP cu_sp_ptr;
const DWARFDebugInfoEntry* die = NULL;
dw_offset_t die_offset = *pos;
if (die_offset != DW_INVALID_OFFSET)
{
die = dwarf2Data->DebugInfo()->GetDIEPtr(die_offset, &cu_sp_ptr);
if (die)
die->GetDIENamesAndRanges(dwarf2Data, cu_sp_ptr.get(), name, mangled, ranges, decl_file, decl_line, decl_column, call_file, call_line, call_column);
}
}
}
return !ranges.IsEmpty();
}
//----------------------------------------------------------------------
// Dump
//
// Dumps a debug information entry and all of it's attributes to the
// specified stream.
//----------------------------------------------------------------------
void
DWARFDebugInfoEntry::Dump
(
SymbolFileDWARF* dwarf2Data,
const DWARFCompileUnit* cu,
Stream &s,
uint32_t recurse_depth
) const
{
const DataExtractor& debug_info_data = dwarf2Data->get_debug_info_data();
lldb::offset_t offset = m_offset;
if (debug_info_data.ValidOffset(offset))
{
dw_uleb128_t abbrCode = debug_info_data.GetULEB128(&offset);
s.Printf("\n0x%8.8x: ", m_offset);
s.Indent();
if (abbrCode != m_abbr_idx)
{
s.Printf( "error: DWARF has been modified\n");
}
else if (abbrCode)
{
const DWARFAbbreviationDeclaration* abbrevDecl = cu->GetAbbreviations()->GetAbbreviationDeclaration (abbrCode);
if (abbrevDecl)
{
s.PutCString(DW_TAG_value_to_name(abbrevDecl->Tag()));
s.Printf( " [%u] %c\n", abbrCode, abbrevDecl->HasChildren() ? '*':' ');
// Dump all data in the .debug_info for the attributes
const uint32_t numAttributes = abbrevDecl->NumAttributes();
uint32_t i;
dw_attr_t attr;
dw_form_t form;
for (i=0; i<numAttributes; ++i)
{
abbrevDecl->GetAttrAndFormByIndexUnchecked(i, attr, form);
DumpAttribute(dwarf2Data, cu, debug_info_data, &offset, s, attr, form);
}
const DWARFDebugInfoEntry* child = GetFirstChild();
if (recurse_depth > 0 && child)
{
s.IndentMore();
while (child)
{
child->Dump(dwarf2Data, cu, s, recurse_depth-1);
child = child->GetSibling();
}
s.IndentLess();
}
}
else
s.Printf( "Abbreviation code note found in 'debug_abbrev' class for code: %u\n", abbrCode);
}
else
{
s.Printf( "NULL\n");
}
}
}
void
DWARFDebugInfoEntry::DumpLocation
(
SymbolFileDWARF* dwarf2Data,
DWARFCompileUnit* cu,
Stream &s
) const
{
const DWARFDebugInfoEntry *cu_die = cu->GetCompileUnitDIEOnly();
const char *cu_name = NULL;
if (cu_die != NULL)
cu_name = cu_die->GetName (dwarf2Data, cu);
const char *obj_file_name = NULL;
ObjectFile *obj_file = dwarf2Data->GetObjectFile();
if (obj_file)
obj_file_name = obj_file->GetFileSpec().GetFilename().AsCString();
const char *die_name = GetName (dwarf2Data, cu);
s.Printf ("0x%8.8x/0x%8.8x: %-30s (from %s in %s)",
cu->GetOffset(),
GetOffset(),
die_name ? die_name : "",
cu_name ? cu_name : "<NULL>",
obj_file_name ? obj_file_name : "<NULL>");
}
//----------------------------------------------------------------------
// DumpAttribute
//
// Dumps a debug information entry attribute along with it's form. Any
// special display of attributes is done (disassemble location lists,
// show enumeration values for attributes, etc).
//----------------------------------------------------------------------
void
DWARFDebugInfoEntry::DumpAttribute
(
SymbolFileDWARF* dwarf2Data,
const DWARFCompileUnit* cu,
const DataExtractor& debug_info_data,
lldb::offset_t *offset_ptr,
Stream &s,
dw_attr_t attr,
dw_form_t form
)
{
bool verbose = s.GetVerbose();
bool show_form = s.GetFlags().Test(DWARFDebugInfo::eDumpFlag_ShowForm);
const DataExtractor* debug_str_data = dwarf2Data ? &dwarf2Data->get_debug_str_data() : NULL;
if (verbose)
s.Offset (*offset_ptr);
else
s.Printf (" ");
s.Indent(DW_AT_value_to_name(attr));
if (show_form)
{
s.Printf( "[%s", DW_FORM_value_to_name(form));
}
DWARFFormValue form_value(form);
if (!form_value.ExtractValue(debug_info_data, offset_ptr, cu))
return;
if (show_form)
{
if (form == DW_FORM_indirect)
{
s.Printf( " [%s]", DW_FORM_value_to_name(form_value.Form()));
}
s.PutCString("] ");
}
s.PutCString("( ");
// Always dump form value if verbose is enabled
if (verbose)
{
form_value.Dump(s, debug_str_data, cu);
}
// Check to see if we have any special attribute formatters
switch (attr)
{
case DW_AT_stmt_list:
if ( verbose ) s.PutCString(" ( ");
s.Printf( "0x%8.8" PRIx64, form_value.Unsigned());
if ( verbose ) s.PutCString(" )");
break;
case DW_AT_language:
if ( verbose ) s.PutCString(" ( ");
s.PutCString(DW_LANG_value_to_name(form_value.Unsigned()));
if ( verbose ) s.PutCString(" )");
break;
case DW_AT_encoding:
if ( verbose ) s.PutCString(" ( ");
s.PutCString(DW_ATE_value_to_name(form_value.Unsigned()));
if ( verbose ) s.PutCString(" )");
break;
case DW_AT_frame_base:
case DW_AT_location:
case DW_AT_data_member_location:
{
const uint8_t* blockData = form_value.BlockData();
if (blockData)
{
if (!verbose)
form_value.Dump(s, debug_str_data, cu);
// Location description is inlined in data in the form value
DataExtractor locationData(debug_info_data, (*offset_ptr) - form_value.Unsigned(), form_value.Unsigned());
if ( verbose ) s.PutCString(" ( ");
print_dwarf_expression (s, locationData, DWARFCompileUnit::GetAddressByteSize(cu), 4, false);
if ( verbose ) s.PutCString(" )");
}
else
{
// We have a location list offset as the value that is
// the offset into the .debug_loc section that describes
// the value over it's lifetime
uint64_t debug_loc_offset = form_value.Unsigned();
if (dwarf2Data)
{
if ( !verbose )
form_value.Dump(s, debug_str_data, cu);
DWARFLocationList::Dump(s, cu, dwarf2Data->get_debug_loc_data(), debug_loc_offset);
}
else
{
if ( !verbose )
form_value.Dump(s, NULL, cu);
}
}
}
break;
case DW_AT_abstract_origin:
case DW_AT_specification:
{
uint64_t abstract_die_offset = form_value.Reference(cu);
form_value.Dump(s, debug_str_data, cu);
// *ostrm_ptr << HEX32 << abstract_die_offset << " ( ";
if ( verbose ) s.PutCString(" ( ");
GetName(dwarf2Data, cu, abstract_die_offset, s);
if ( verbose ) s.PutCString(" )");
}
break;
case DW_AT_type:
{
uint64_t type_die_offset = form_value.Reference(cu);
if (!verbose)
form_value.Dump(s, debug_str_data, cu);
s.PutCString(" ( ");
AppendTypeName(dwarf2Data, cu, type_die_offset, s);
s.PutCString(" )");
}
break;
case DW_AT_ranges:
{
if ( !verbose )
form_value.Dump(s, debug_str_data, cu);
lldb::offset_t ranges_offset = form_value.Unsigned();
dw_addr_t base_addr = cu ? cu->GetBaseAddress() : 0;
if (dwarf2Data)
DWARFDebugRanges::Dump(s, dwarf2Data->get_debug_ranges_data(), &ranges_offset, base_addr);
}
break;
default:
if ( !verbose )
form_value.Dump(s, debug_str_data, cu);
break;
}
s.PutCString(" )\n");
}
//----------------------------------------------------------------------
// 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).
//----------------------------------------------------------------------
size_t
DWARFDebugInfoEntry::GetAttributes
(
SymbolFileDWARF* dwarf2Data,
const DWARFCompileUnit* cu,
const uint8_t *fixed_form_sizes,
DWARFDebugInfoEntry::Attributes& attributes,
uint32_t curr_depth
) const
{
lldb::offset_t offset;
const DWARFAbbreviationDeclaration* abbrevDecl = GetAbbreviationDeclarationPtr(dwarf2Data, cu, offset);
if (abbrevDecl)
{
const DataExtractor& debug_info_data = dwarf2Data->get_debug_info_data();
if (fixed_form_sizes == NULL)
fixed_form_sizes = DWARFFormValue::GetFixedFormSizesForAddressSize(cu->GetAddressByteSize());
const uint32_t num_attributes = abbrevDecl->NumAttributes();
uint32_t i;
dw_attr_t attr;
dw_form_t form;
DWARFFormValue form_value;
for (i=0; i<num_attributes; ++i)
{
abbrevDecl->GetAttrAndFormByIndexUnchecked (i, attr, form);
// If we are tracking down DW_AT_specification or DW_AT_abstract_origin
// attributes, the depth will be non-zero. We need to omit certain
// attributes that don't make sense.
switch (attr)
{
case DW_AT_sibling:
case DW_AT_declaration:
if (curr_depth > 0)
{
// This attribute doesn't make sense when combined with
// the DIE that references this DIE. We know a DIE is
// referencing this DIE because curr_depth is not zero
break;
}
// Fall through...
default:
attributes.Append(cu, offset, attr, form);
break;
}
if ((attr == DW_AT_specification) || (attr == DW_AT_abstract_origin))
{
form_value.SetForm(form);
if (form_value.ExtractValue(debug_info_data, &offset, cu))
{
const DWARFDebugInfoEntry* die = NULL;
dw_offset_t die_offset = form_value.Reference(cu);
if (cu->ContainsDIEOffset(die_offset))
{
die = const_cast<DWARFCompileUnit*>(cu)->GetDIEPtr(die_offset);
if (die)
die->GetAttributes(dwarf2Data, cu, fixed_form_sizes, attributes, curr_depth + 1);
}
else
{
DWARFCompileUnitSP cu_sp_ptr;
die = const_cast<SymbolFileDWARF*>(dwarf2Data)->DebugInfo()->GetDIEPtr(die_offset, &cu_sp_ptr);
if (die)
die->GetAttributes(dwarf2Data, cu_sp_ptr.get(), fixed_form_sizes, attributes, curr_depth + 1);
}
}
}
else
{
const uint8_t fixed_skip_size = fixed_form_sizes [form];
if (fixed_skip_size)
offset += fixed_skip_size;
else
DWARFFormValue::SkipValue(form, debug_info_data, &offset, cu);
}
}
}
else
{
attributes.Clear();
}
return attributes.Size();
}
//----------------------------------------------------------------------
// GetAttributeValue
//
// Get the value of an attribute and return the .debug_info 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
(
SymbolFileDWARF* dwarf2Data,
const DWARFCompileUnit* cu,
const dw_attr_t attr,
DWARFFormValue& form_value,
dw_offset_t* end_attr_offset_ptr
) const
{
lldb::offset_t offset;
const DWARFAbbreviationDeclaration* abbrevDecl = GetAbbreviationDeclarationPtr(dwarf2Data, cu, offset);
if (abbrevDecl)
{
uint32_t attr_idx = abbrevDecl->FindAttributeIndex(attr);
if (attr_idx != DW_INVALID_INDEX)
{
const DataExtractor& debug_info_data = dwarf2Data->get_debug_info_data();
uint32_t idx=0;
while (idx<attr_idx)
DWARFFormValue::SkipValue(abbrevDecl->GetFormByIndex(idx++), debug_info_data, &offset, cu);
const dw_offset_t attr_offset = offset;
form_value.SetForm(abbrevDecl->GetFormByIndex(idx));
if (form_value.ExtractValue(debug_info_data, &offset, cu))
{
if (end_attr_offset_ptr)
*end_attr_offset_ptr = offset;
return attr_offset;
}
}
}
return 0;
}
//----------------------------------------------------------------------
// 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
(
SymbolFileDWARF* dwarf2Data,
const DWARFCompileUnit* cu,
const dw_attr_t attr,
const char* fail_value) const
{
DWARFFormValue form_value;
if (GetAttributeValue(dwarf2Data, cu, attr, form_value))
return form_value.AsCString(&dwarf2Data->get_debug_str_data());
return fail_value;
}
//----------------------------------------------------------------------
// GetAttributeValueAsUnsigned
//
// Get the value of an attribute as unsigned and return it.
//----------------------------------------------------------------------
uint64_t
DWARFDebugInfoEntry::GetAttributeValueAsUnsigned
(
SymbolFileDWARF* dwarf2Data,
const DWARFCompileUnit* cu,
const dw_attr_t attr,
uint64_t fail_value
) const
{
DWARFFormValue form_value;
if (GetAttributeValue(dwarf2Data, cu, attr, form_value))
return form_value.Unsigned();
return fail_value;
}
//----------------------------------------------------------------------
// GetAttributeValueAsSigned
//
// Get the value of an attribute a signed value and return it.
//----------------------------------------------------------------------
int64_t
DWARFDebugInfoEntry::GetAttributeValueAsSigned
(
SymbolFileDWARF* dwarf2Data,
const DWARFCompileUnit* cu,
const dw_attr_t attr,
int64_t fail_value
) const
{
DWARFFormValue form_value;
if (GetAttributeValue(dwarf2Data, cu, attr, form_value))
return form_value.Signed();
return fail_value;
}
//----------------------------------------------------------------------
// GetAttributeValueAsReference
//
// Get the value of an attribute as reference and fix up and compile
// unit relative offsets as needed.
//----------------------------------------------------------------------
uint64_t
DWARFDebugInfoEntry::GetAttributeValueAsReference
(
SymbolFileDWARF* dwarf2Data,
const DWARFCompileUnit* cu,
const dw_attr_t attr,
uint64_t fail_value
) const
{
DWARFFormValue form_value;
if (GetAttributeValue(dwarf2Data, cu, attr, form_value))
return form_value.Reference(cu);
return fail_value;
}
//----------------------------------------------------------------------
// GetAttributeValueAsLocation
//
// Get the value of an attribute as reference and fix up and compile
// unit relative offsets as needed.
//----------------------------------------------------------------------
dw_offset_t
DWARFDebugInfoEntry::GetAttributeValueAsLocation
(
SymbolFileDWARF* dwarf2Data,
const DWARFCompileUnit* cu,
const dw_attr_t attr,
DataExtractor& location_data,
uint32_t &block_size
) const
{
block_size = 0;
DWARFFormValue form_value;
// Empty out data in case we don't find anything
location_data.Clear();
dw_offset_t end_addr_offset = DW_INVALID_OFFSET;
const dw_offset_t attr_offset = GetAttributeValue(dwarf2Data, cu, attr, form_value, &end_addr_offset);
if (attr_offset)
{
const uint8_t* blockData = form_value.BlockData();
if (blockData)
{
// We have an inlined location list in the .debug_info section
const DataExtractor& debug_info = dwarf2Data->get_debug_info_data();
dw_offset_t block_offset = blockData - debug_info.GetDataStart();
block_size = (end_addr_offset - attr_offset) - form_value.Unsigned();
location_data.SetData(debug_info, block_offset, block_size);
}
else
{
// We have a location list offset as the value that is
// the offset into the .debug_loc section that describes
// the value over it's lifetime
lldb::offset_t debug_loc_offset = form_value.Unsigned();
if (dwarf2Data)
{
assert(dwarf2Data->get_debug_loc_data().GetAddressByteSize() == cu->GetAddressByteSize());
return DWARFLocationList::Extract(dwarf2Data->get_debug_loc_data(), &debug_loc_offset, location_data);
}
}
}
return attr_offset;
}
//----------------------------------------------------------------------
// GetName
//
// Get value of the DW_AT_name attribute and return it if one exists,
// else return NULL.
//----------------------------------------------------------------------
const char*
DWARFDebugInfoEntry::GetName
(
SymbolFileDWARF* dwarf2Data,
const DWARFCompileUnit* cu
) const
{
DWARFFormValue form_value;
if (GetAttributeValue(dwarf2Data, cu, DW_AT_name, form_value))
return form_value.AsCString(&dwarf2Data->get_debug_str_data());
else
{
if (GetAttributeValue(dwarf2Data, cu, DW_AT_specification, form_value))
{
DWARFCompileUnitSP cu_sp_ptr;
const DWARFDebugInfoEntry* die = const_cast<SymbolFileDWARF*>(dwarf2Data)->DebugInfo()->GetDIEPtr(form_value.Reference(cu), &cu_sp_ptr);
if (die)
return die->GetName(dwarf2Data, cu_sp_ptr.get());
}
}
return NULL;
}
//----------------------------------------------------------------------
// 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
(
SymbolFileDWARF* dwarf2Data,
const DWARFCompileUnit* cu,
bool substitute_name_allowed
) const
{
const char* name = NULL;
DWARFFormValue form_value;
if (GetAttributeValue(dwarf2Data, cu, DW_AT_MIPS_linkage_name, form_value))
name = form_value.AsCString(&dwarf2Data->get_debug_str_data());
if (GetAttributeValue(dwarf2Data, cu, DW_AT_linkage_name, form_value))
name = form_value.AsCString(&dwarf2Data->get_debug_str_data());
if (substitute_name_allowed && name == NULL)
{
if (GetAttributeValue(dwarf2Data, cu, DW_AT_name, form_value))
name = form_value.AsCString(&dwarf2Data->get_debug_str_data());
}
return name;
}
//----------------------------------------------------------------------
// GetPubname
//
// Get value the name for a DIE as it should appear for a
// .debug_pubnames or .debug_pubtypes section.
//----------------------------------------------------------------------
const char*
DWARFDebugInfoEntry::GetPubname
(
SymbolFileDWARF* dwarf2Data,
const DWARFCompileUnit* cu
) const
{
const char* name = NULL;
if (!dwarf2Data)
return name;
DWARFFormValue form_value;
if (GetAttributeValue(dwarf2Data, cu, DW_AT_MIPS_linkage_name, form_value))
name = form_value.AsCString(&dwarf2Data->get_debug_str_data());
else if (GetAttributeValue(dwarf2Data, cu, DW_AT_linkage_name, form_value))
name = form_value.AsCString(&dwarf2Data->get_debug_str_data());
else if (GetAttributeValue(dwarf2Data, cu, DW_AT_name, form_value))
name = form_value.AsCString(&dwarf2Data->get_debug_str_data());
else if (GetAttributeValue(dwarf2Data, cu, DW_AT_specification, form_value))
{
// The specification DIE may be in another compile unit so we need
// to get a die and its compile unit.
DWARFCompileUnitSP cu_sp_ptr;
const DWARFDebugInfoEntry* die = const_cast<SymbolFileDWARF*>(dwarf2Data)->DebugInfo()->GetDIEPtr(form_value.Reference(cu), &cu_sp_ptr);
if (die)
return die->GetPubname(dwarf2Data, cu_sp_ptr.get());
}
return name;
}
//----------------------------------------------------------------------
// GetName
//
// Get value of the DW_AT_name attribute for a debug information entry
// that exists at offset "die_offset" and place that value into the
// supplied stream object. If the DIE is a NULL object "NULL" is placed
// into the stream, and if no DW_AT_name attribute exists for the DIE
// then nothing is printed.
//----------------------------------------------------------------------
bool
DWARFDebugInfoEntry::GetName
(
SymbolFileDWARF* dwarf2Data,
const DWARFCompileUnit* cu,
const dw_offset_t die_offset,
Stream &s
)
{
if (dwarf2Data == NULL)
{
s.PutCString("NULL");
return false;
}
DWARFDebugInfoEntry die;
lldb::offset_t offset = die_offset;
if (die.Extract(dwarf2Data, cu, &offset))
{
if (die.IsNULL())
{
s.PutCString("NULL");
return true;
}
else
{
DWARFFormValue form_value;
if (die.GetAttributeValue(dwarf2Data, cu, DW_AT_name, form_value))
{
const char* name = form_value.AsCString(&dwarf2Data->get_debug_str_data());
if (name)
{
s.PutCString(name);
return true;
}
}
}
}
return false;
}
//----------------------------------------------------------------------
// AppendTypeName
//
// Follows the type name definition down through all needed tags to
// end up with a fully qualified type name and dump the results to
// the supplied stream. This is used to show the name of types given
// a type identifier.
//----------------------------------------------------------------------
bool
DWARFDebugInfoEntry::AppendTypeName
(
SymbolFileDWARF* dwarf2Data,
const DWARFCompileUnit* cu,
const dw_offset_t die_offset,
Stream &s
)
{
if (dwarf2Data == NULL)
{
s.PutCString("NULL");
return false;
}
DWARFDebugInfoEntry die;
lldb::offset_t offset = die_offset;
if (die.Extract(dwarf2Data, cu, &offset))
{
if (die.IsNULL())
{
s.PutCString("NULL");
return true;
}
else
{
const char* name = die.GetPubname(dwarf2Data, cu);
// if (die.GetAttributeValue(dwarf2Data, cu, DW_AT_name, form_value))
// name = form_value.AsCString(&dwarf2Data->get_debug_str_data());
if (name)
s.PutCString(name);
else
{
bool result = true;
const DWARFAbbreviationDeclaration* abbrevDecl = die.GetAbbreviationDeclarationPtr(dwarf2Data, cu, offset);
if (abbrevDecl == NULL)
return false;
switch (abbrevDecl->Tag())
{
case DW_TAG_array_type: break; // print out a "[]" after printing the full type of the element below
case DW_TAG_base_type: s.PutCString("base "); break;
case DW_TAG_class_type: s.PutCString("class "); break;
case DW_TAG_const_type: s.PutCString("const "); break;
case DW_TAG_enumeration_type: s.PutCString("enum "); break;
case DW_TAG_file_type: s.PutCString("file "); break;
case DW_TAG_interface_type: s.PutCString("interface "); break;
case DW_TAG_packed_type: s.PutCString("packed "); break;
case DW_TAG_pointer_type: break; // print out a '*' after printing the full type below
case DW_TAG_ptr_to_member_type: break; // print out a '*' after printing the full type below
case DW_TAG_reference_type: break; // print out a '&' after printing the full type below
case DW_TAG_restrict_type: s.PutCString("restrict "); break;
case DW_TAG_set_type: s.PutCString("set "); break;
case DW_TAG_shared_type: s.PutCString("shared "); break;
case DW_TAG_string_type: s.PutCString("string "); break;
case DW_TAG_structure_type: s.PutCString("struct "); break;
case DW_TAG_subrange_type: s.PutCString("subrange "); break;
case DW_TAG_subroutine_type: s.PutCString("function "); break;
case DW_TAG_thrown_type: s.PutCString("thrown "); break;
case DW_TAG_union_type: s.PutCString("union "); break;
case DW_TAG_unspecified_type: s.PutCString("unspecified "); break;
case DW_TAG_volatile_type: s.PutCString("volatile "); break;
default:
return false;
}
// Follow the DW_AT_type if possible
DWARFFormValue form_value;
if (die.GetAttributeValue(dwarf2Data, cu, DW_AT_type, form_value))
{
uint64_t next_die_offset = form_value.Reference(cu);
result = AppendTypeName(dwarf2Data, cu, next_die_offset, s);
}
switch (abbrevDecl->Tag())
{
case DW_TAG_array_type: s.PutCString("[]"); break;
case DW_TAG_pointer_type: s.PutChar('*'); break;
case DW_TAG_ptr_to_member_type: s.PutChar('*'); break;
case DW_TAG_reference_type: s.PutChar('&'); break;
default:
break;
}
return result;
}
}
}
return false;
}
bool
DWARFDebugInfoEntry::Contains (const DWARFDebugInfoEntry *die) const
{
if (die)
{
const dw_offset_t die_offset = die->GetOffset();
if (die_offset > GetOffset())
{
const DWARFDebugInfoEntry *sibling = GetSibling();
assert (sibling); // TODO: take this out
if (sibling)
return die_offset < sibling->GetOffset();
}
}
return false;
}
//----------------------------------------------------------------------
// BuildAddressRangeTable
//----------------------------------------------------------------------
void
DWARFDebugInfoEntry::BuildAddressRangeTable
(
SymbolFileDWARF* dwarf2Data,
const DWARFCompileUnit* cu,
DWARFDebugAranges* debug_aranges
) const
{
if (m_tag)
{
if (m_tag == DW_TAG_subprogram)
{
dw_addr_t hi_pc = LLDB_INVALID_ADDRESS;
dw_addr_t lo_pc = GetAttributeValueAsUnsigned(dwarf2Data, cu, DW_AT_low_pc, LLDB_INVALID_ADDRESS);
if (lo_pc != LLDB_INVALID_ADDRESS)
hi_pc = GetAttributeValueAsUnsigned(dwarf2Data, cu, DW_AT_high_pc, LLDB_INVALID_ADDRESS);
if (hi_pc != LLDB_INVALID_ADDRESS)
{
/// printf("BuildAddressRangeTable() 0x%8.8x: %30s: [0x%8.8x - 0x%8.8x)\n", m_offset, DW_TAG_value_to_name(tag), lo_pc, hi_pc);
debug_aranges->AppendRange (cu->GetOffset(), lo_pc, hi_pc);
}
}
const DWARFDebugInfoEntry* child = GetFirstChild();
while (child)
{
child->BuildAddressRangeTable(dwarf2Data, cu, debug_aranges);
child = child->GetSibling();
}
}
}
//----------------------------------------------------------------------
// BuildFunctionAddressRangeTable
//
// This function is very similar to the BuildAddressRangeTable function
// except that the actual DIE offset for the function is placed in the
// table instead of the compile unit offset (which is the way the
// standard .debug_aranges section does it).
//----------------------------------------------------------------------
void
DWARFDebugInfoEntry::BuildFunctionAddressRangeTable
(
SymbolFileDWARF* dwarf2Data,
const DWARFCompileUnit* cu,
DWARFDebugAranges* debug_aranges
) const
{
if (m_tag)
{
if (m_tag == DW_TAG_subprogram)
{
dw_addr_t hi_pc = LLDB_INVALID_ADDRESS;
dw_addr_t lo_pc = GetAttributeValueAsUnsigned(dwarf2Data, cu, DW_AT_low_pc, LLDB_INVALID_ADDRESS);
if (lo_pc != LLDB_INVALID_ADDRESS)
hi_pc = GetAttributeValueAsUnsigned(dwarf2Data, cu, DW_AT_high_pc, LLDB_INVALID_ADDRESS);
if (hi_pc != LLDB_INVALID_ADDRESS)
{
// printf("BuildAddressRangeTable() 0x%8.8x: [0x%16.16" PRIx64 " - 0x%16.16" PRIx64 ")\n", m_offset, lo_pc, hi_pc); // DEBUG ONLY
debug_aranges->AppendRange (GetOffset(), lo_pc, hi_pc);
}
}
const DWARFDebugInfoEntry* child = GetFirstChild();
while (child)
{
child->BuildFunctionAddressRangeTable(dwarf2Data, cu, debug_aranges);
child = child->GetSibling();
}
}
}
void
DWARFDebugInfoEntry::GetDeclContextDIEs (SymbolFileDWARF* dwarf2Data,
DWARFCompileUnit* cu,
DWARFDIECollection &decl_context_dies) const
{
const DWARFDebugInfoEntry *parent_decl_ctx_die = GetParentDeclContextDIE (dwarf2Data, cu);
if (parent_decl_ctx_die && parent_decl_ctx_die != this)
{
decl_context_dies.Append(parent_decl_ctx_die);
parent_decl_ctx_die->GetDeclContextDIEs (dwarf2Data, cu, decl_context_dies);
}
}
void
DWARFDebugInfoEntry::GetDWARFDeclContext (SymbolFileDWARF* dwarf2Data,
DWARFCompileUnit* cu,
DWARFDeclContext &dwarf_decl_ctx) const
{
const dw_tag_t tag = Tag();
if (tag != DW_TAG_compile_unit)
{
dwarf_decl_ctx.AppendDeclContext(tag, GetName(dwarf2Data, cu));
const DWARFDebugInfoEntry *parent_decl_ctx_die = GetParentDeclContextDIE (dwarf2Data, cu);
if (parent_decl_ctx_die && parent_decl_ctx_die != this)
{
if (parent_decl_ctx_die->Tag() != DW_TAG_compile_unit)
parent_decl_ctx_die->GetDWARFDeclContext (dwarf2Data, cu, dwarf_decl_ctx);
}
}
}
bool
DWARFDebugInfoEntry::MatchesDWARFDeclContext (SymbolFileDWARF* dwarf2Data,
DWARFCompileUnit* cu,
const DWARFDeclContext &dwarf_decl_ctx) const
{
DWARFDeclContext this_dwarf_decl_ctx;
GetDWARFDeclContext (dwarf2Data, cu, this_dwarf_decl_ctx);
return this_dwarf_decl_ctx == dwarf_decl_ctx;
}
const DWARFDebugInfoEntry *
DWARFDebugInfoEntry::GetParentDeclContextDIE (SymbolFileDWARF* dwarf2Data,
DWARFCompileUnit* cu) const
{
DWARFDebugInfoEntry::Attributes attributes;
GetAttributes(dwarf2Data, cu, NULL, attributes);
return GetParentDeclContextDIE (dwarf2Data, cu, attributes);
}
const DWARFDebugInfoEntry *
DWARFDebugInfoEntry::GetParentDeclContextDIE (SymbolFileDWARF* dwarf2Data,
DWARFCompileUnit* cu,
const DWARFDebugInfoEntry::Attributes& attributes) const
{
const DWARFDebugInfoEntry * die = this;
while (die != NULL)
{
// If this is the original DIE that we are searching for a declaration
// for, then don't look in the cache as we don't want our own decl
// context to be our decl context...
if (die != this)
{
switch (die->Tag())
{
case DW_TAG_compile_unit:
case DW_TAG_namespace:
case DW_TAG_structure_type:
case DW_TAG_union_type:
case DW_TAG_class_type:
return die;
default:
break;
}
}
dw_offset_t die_offset;
die_offset = attributes.FormValueAsUnsigned(dwarf2Data, DW_AT_specification, DW_INVALID_OFFSET);
if (die_offset != DW_INVALID_OFFSET)
{
const DWARFDebugInfoEntry *spec_die = cu->GetDIEPtr (die_offset);
if (spec_die)
{
const DWARFDebugInfoEntry *spec_die_decl_ctx_die = spec_die->GetParentDeclContextDIE (dwarf2Data, cu);
if (spec_die_decl_ctx_die)
return spec_die_decl_ctx_die;
}
}
die_offset = attributes.FormValueAsUnsigned(dwarf2Data, DW_AT_abstract_origin, DW_INVALID_OFFSET);
if (die_offset != DW_INVALID_OFFSET)
{
const DWARFDebugInfoEntry *abs_die = cu->GetDIEPtr (die_offset);
if (abs_die)
{
const DWARFDebugInfoEntry *abs_die_decl_ctx_die = abs_die->GetParentDeclContextDIE (dwarf2Data, cu);
if (abs_die_decl_ctx_die)
return abs_die_decl_ctx_die;
}
}
die = die->GetParent();
}
return NULL;
}
const char *
DWARFDebugInfoEntry::GetQualifiedName (SymbolFileDWARF* dwarf2Data,
DWARFCompileUnit* cu,
std::string &storage) const
{
DWARFDebugInfoEntry::Attributes attributes;
GetAttributes(dwarf2Data, cu, NULL, attributes);
return GetQualifiedName (dwarf2Data, cu, attributes, storage);
}
const char*
DWARFDebugInfoEntry::GetQualifiedName (SymbolFileDWARF* dwarf2Data,
DWARFCompileUnit* cu,
const DWARFDebugInfoEntry::Attributes& attributes,
std::string &storage) const
{
const char *name = GetName (dwarf2Data, cu);
if (name)
{
const DWARFDebugInfoEntry *parent_decl_ctx_die = GetParentDeclContextDIE (dwarf2Data, cu);
storage.clear();
// TODO: change this to get the correct decl context parent....
while (parent_decl_ctx_die)
{
const dw_tag_t parent_tag = parent_decl_ctx_die->Tag();
switch (parent_tag)
{
case DW_TAG_namespace:
{
const char *namespace_name = parent_decl_ctx_die->GetName (dwarf2Data, cu);
if (namespace_name)
{
storage.insert (0, "::");
storage.insert (0, namespace_name);
}
else
{
storage.insert (0, "(anonymous namespace)::");
}
parent_decl_ctx_die = parent_decl_ctx_die->GetParentDeclContextDIE(dwarf2Data, cu);
}
break;
case DW_TAG_class_type:
case DW_TAG_structure_type:
case DW_TAG_union_type:
{
const char *class_union_struct_name = parent_decl_ctx_die->GetName (dwarf2Data, cu);
if (class_union_struct_name)
{
storage.insert (0, "::");
storage.insert (0, class_union_struct_name);
}
parent_decl_ctx_die = parent_decl_ctx_die->GetParentDeclContextDIE(dwarf2Data, cu);
}
break;
default:
parent_decl_ctx_die = NULL;
break;
}
}
if (storage.empty())
storage.append ("::");
storage.append (name);
}
if (storage.empty())
return NULL;
return storage.c_str();
}
//----------------------------------------------------------------------
// LookupAddress
//----------------------------------------------------------------------
bool
DWARFDebugInfoEntry::LookupAddress
(
const dw_addr_t address,
SymbolFileDWARF* dwarf2Data,
const DWARFCompileUnit* cu,
DWARFDebugInfoEntry** function_die,
DWARFDebugInfoEntry** block_die
)
{
bool found_address = false;
if (m_tag)
{
bool check_children = false;
bool match_addr_range = false;
// printf("0x%8.8x: %30s: address = 0x%8.8x - ", m_offset, DW_TAG_value_to_name(tag), address);
switch (m_tag)
{
case DW_TAG_array_type : break;
case DW_TAG_class_type : check_children = true; break;
case DW_TAG_entry_point : break;
case DW_TAG_enumeration_type : break;
case DW_TAG_formal_parameter : break;
case DW_TAG_imported_declaration : break;
case DW_TAG_label : break;
case DW_TAG_lexical_block : check_children = true; match_addr_range = true; break;
case DW_TAG_member : break;
case DW_TAG_pointer_type : break;
case DW_TAG_reference_type : break;
case DW_TAG_compile_unit : match_addr_range = true; break;
case DW_TAG_string_type : break;
case DW_TAG_structure_type : check_children = true; break;
case DW_TAG_subroutine_type : break;
case DW_TAG_typedef : break;
case DW_TAG_union_type : break;
case DW_TAG_unspecified_parameters : break;
case DW_TAG_variant : break;
case DW_TAG_common_block : check_children = true; break;
case DW_TAG_common_inclusion : break;
case DW_TAG_inheritance : break;
case DW_TAG_inlined_subroutine : check_children = true; match_addr_range = true; break;
case DW_TAG_module : match_addr_range = true; break;
case DW_TAG_ptr_to_member_type : break;
case DW_TAG_set_type : break;
case DW_TAG_subrange_type : break;
case DW_TAG_with_stmt : break;
case DW_TAG_access_declaration : break;
case DW_TAG_base_type : break;
case DW_TAG_catch_block : match_addr_range = true; break;
case DW_TAG_const_type : break;
case DW_TAG_constant : break;
case DW_TAG_enumerator : break;
case DW_TAG_file_type : break;
case DW_TAG_friend : break;
case DW_TAG_namelist : break;
case DW_TAG_namelist_item : break;
case DW_TAG_packed_type : break;
case DW_TAG_subprogram : match_addr_range = true; break;
case DW_TAG_template_type_parameter : break;
case DW_TAG_template_value_parameter : break;
case DW_TAG_thrown_type : break;
case DW_TAG_try_block : match_addr_range = true; break;
case DW_TAG_variant_part : break;
case DW_TAG_variable : break;
case DW_TAG_volatile_type : break;
case DW_TAG_dwarf_procedure : break;
case DW_TAG_restrict_type : break;
case DW_TAG_interface_type : break;
case DW_TAG_namespace : check_children = true; break;
case DW_TAG_imported_module : break;
case DW_TAG_unspecified_type : break;
case DW_TAG_partial_unit : break;
case DW_TAG_imported_unit : break;
case DW_TAG_shared_type : break;
default: break;
}
if (match_addr_range)
{
dw_addr_t lo_pc = GetAttributeValueAsUnsigned(dwarf2Data, cu, DW_AT_low_pc, LLDB_INVALID_ADDRESS);
if (lo_pc != LLDB_INVALID_ADDRESS)
{
dw_addr_t hi_pc = GetAttributeValueAsUnsigned(dwarf2Data, cu, DW_AT_high_pc, LLDB_INVALID_ADDRESS);
if (hi_pc != LLDB_INVALID_ADDRESS)
{
// printf("\n0x%8.8x: %30s: address = 0x%8.8x [0x%8.8x - 0x%8.8x) ", m_offset, DW_TAG_value_to_name(tag), address, lo_pc, hi_pc);
if ((lo_pc <= address) && (address < hi_pc))
{
found_address = true;
// puts("***MATCH***");
switch (m_tag)
{
case DW_TAG_compile_unit: // File
check_children = ((function_die != NULL) || (block_die != NULL));
break;
case DW_TAG_subprogram: // Function
if (function_die)
*function_die = this;
check_children = (block_die != NULL);
break;
case DW_TAG_inlined_subroutine: // Inlined Function
case DW_TAG_lexical_block: // Block { } in code
if (block_die)
{
*block_die = this;
check_children = true;
}
break;
default:
check_children = true;
break;
}
}
}
else
{ // compile units may not have a valid high/low pc when there
// are address gaps in subroutines so we must always search
// if there is no valid high and low PC
check_children = (m_tag == DW_TAG_compile_unit) && ((function_die != NULL) || (block_die != NULL));
}
}
else
{
dw_offset_t debug_ranges_offset = GetAttributeValueAsUnsigned(dwarf2Data, cu, DW_AT_ranges, DW_INVALID_OFFSET);
if (debug_ranges_offset != DW_INVALID_OFFSET)
{
DWARFDebugRanges::RangeList ranges;
DWARFDebugRanges* debug_ranges = dwarf2Data->DebugRanges();
debug_ranges->FindRanges(debug_ranges_offset, ranges);
// All DW_AT_ranges are relative to the base address of the
// compile unit. We add the compile unit base address to make
// sure all the addresses are properly fixed up.
ranges.Slide (cu->GetBaseAddress());
if (ranges.FindEntryThatContains(address))
{
found_address = true;
// puts("***MATCH***");
switch (m_tag)
{
case DW_TAG_compile_unit: // File
check_children = ((function_die != NULL) || (block_die != NULL));
break;
case DW_TAG_subprogram: // Function
if (function_die)
*function_die = this;
check_children = (block_die != NULL);
break;
case DW_TAG_inlined_subroutine: // Inlined Function
case DW_TAG_lexical_block: // Block { } in code
if (block_die)
{
*block_die = this;
check_children = true;
}
break;
default:
check_children = true;
break;
}
}
else
{
check_children = false;
}
}
}
}
if (check_children)
{
// printf("checking children\n");
DWARFDebugInfoEntry* child = GetFirstChild();
while (child)
{
if (child->LookupAddress(address, dwarf2Data, cu, function_die, block_die))
return true;
child = child->GetSibling();
}
}
}
return found_address;
}
const DWARFAbbreviationDeclaration*
DWARFDebugInfoEntry::GetAbbreviationDeclarationPtr (SymbolFileDWARF* dwarf2Data,
const DWARFCompileUnit *cu,
lldb::offset_t &offset) const
{
if (dwarf2Data)
{
offset = GetOffset();
const DWARFAbbreviationDeclaration* abbrev_decl = cu->GetAbbreviations()->GetAbbreviationDeclaration (m_abbr_idx);
if (abbrev_decl)
{
// Make sure the abbreviation code still matches. If it doesn't and
// the DWARF data was mmap'ed, the backing file might have been modified
// which is bad news.
const uint64_t abbrev_code = dwarf2Data->get_debug_info_data().GetULEB128 (&offset);
if (abbrev_decl->Code() == abbrev_code)
return abbrev_decl;
dwarf2Data->GetObjectFile()->GetModule()->ReportErrorIfModifyDetected ("0x%8.8x: the DWARF debug information has been modified (abbrev code was %u, and is now %u)",
GetOffset(),
(uint32_t)abbrev_decl->Code(),
(uint32_t)abbrev_code);
}
}
offset = DW_INVALID_OFFSET;
return NULL;
}
bool
DWARFDebugInfoEntry::OffsetLessThan (const DWARFDebugInfoEntry& a, const DWARFDebugInfoEntry& b)
{
return a.GetOffset() < b.GetOffset();
}
void
DWARFDebugInfoEntry::DumpDIECollection (Stream &strm, DWARFDebugInfoEntry::collection &die_collection)
{
DWARFDebugInfoEntry::const_iterator pos;
DWARFDebugInfoEntry::const_iterator end = die_collection.end();
strm.PutCString("\noffset parent sibling child\n");
strm.PutCString("-------- -------- -------- --------\n");
for (pos = die_collection.begin(); pos != end; ++pos)
{
const DWARFDebugInfoEntry& die_ref = *pos;
const DWARFDebugInfoEntry* p = die_ref.GetParent();
const DWARFDebugInfoEntry* s = die_ref.GetSibling();
const DWARFDebugInfoEntry* c = die_ref.GetFirstChild();
strm.Printf("%.8x: %.8x %.8x %.8x 0x%4.4x %s%s\n",
die_ref.GetOffset(),
p ? p->GetOffset() : 0,
s ? s->GetOffset() : 0,
c ? c->GetOffset() : 0,
die_ref.Tag(),
DW_TAG_value_to_name(die_ref.Tag()),
die_ref.HasChildren() ? " *" : "");
}
}
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