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android / toolchain / rustc / refs/heads/main / . / vendor / gimli-0.26.1 / src / write / unit.rs
blob: bf85ff4217b78cfc2fb308363f983e2ccf4cb5b9 [file] [log] [blame] [edit]
use alloc::vec::Vec;
use std::ops::{Deref, DerefMut};
use std::{slice, usize};
use crate::common::{
DebugAbbrevOffset, DebugInfoOffset, DebugLineOffset, DebugMacinfoOffset, DebugMacroOffset,
DebugStrOffset, DebugTypeSignature, DwoId, Encoding, Format, SectionId,
};
use crate::constants;
use crate::leb128::write::{sleb128_size, uleb128_size};
use crate::write::{
Abbreviation, AbbreviationTable, Address, AttributeSpecification, BaseId, DebugLineStrOffsets,
DebugStrOffsets, Error, Expression, FileId, LineProgram, LineStringId, LocationListId,
LocationListOffsets, LocationListTable, RangeListId, RangeListOffsets, RangeListTable,
Reference, Result, Section, Sections, StringId, Writer,
};
define_id!(UnitId, "An identifier for a unit in a `UnitTable`.");
define_id!(UnitEntryId, "An identifier for an entry in a `Unit`.");
/// A table of units that will be stored in the `.debug_info` section.
#[derive(Debug, Default)]
pub struct UnitTable {
base_id: BaseId,
units: Vec<Unit>,
}
impl UnitTable {
/// Create a new unit and add it to the table.
///
/// `address_size` must be in bytes.
///
/// Returns the `UnitId` of the new unit.
#[inline]
pub fn add(&mut self, unit: Unit) -> UnitId {
let id = UnitId::new(self.base_id, self.units.len());
self.units.push(unit);
id
}
/// Return the number of units.
#[inline]
pub fn count(&self) -> usize {
self.units.len()
}
/// Return the id of a unit.
///
/// # Panics
///
/// Panics if `index >= self.count()`.
#[inline]
pub fn id(&self, index: usize) -> UnitId {
assert!(index < self.count());
UnitId::new(self.base_id, index)
}
/// Get a reference to a unit.
///
/// # Panics
///
/// Panics if `id` is invalid.
#[inline]
pub fn get(&self, id: UnitId) -> &Unit {
debug_assert_eq!(self.base_id, id.base_id);
&self.units[id.index]
}
/// Get a mutable reference to a unit.
///
/// # Panics
///
/// Panics if `id` is invalid.
#[inline]
pub fn get_mut(&mut self, id: UnitId) -> &mut Unit {
debug_assert_eq!(self.base_id, id.base_id);
&mut self.units[id.index]
}
/// Write the units to the given sections.
///
/// `strings` must contain the `.debug_str` offsets of the corresponding
/// `StringTable`.
pub fn write<W: Writer>(
&mut self,
sections: &mut Sections<W>,
line_strings: &DebugLineStrOffsets,
strings: &DebugStrOffsets,
) -> Result<DebugInfoOffsets> {
let mut offsets = DebugInfoOffsets {
base_id: self.base_id,
units: Vec::new(),
};
for unit in &mut self.units {
// TODO: maybe share abbreviation tables
let abbrev_offset = sections.debug_abbrev.offset();
let mut abbrevs = AbbreviationTable::default();
offsets.units.push(unit.write(
sections,
abbrev_offset,
&mut abbrevs,
line_strings,
strings,
)?);
abbrevs.write(&mut sections.debug_abbrev)?;
}
write_section_refs(
&mut sections.debug_info_refs,
&mut sections.debug_info.0,
&offsets,
)?;
write_section_refs(
&mut sections.debug_loc_refs,
&mut sections.debug_loc.0,
&offsets,
)?;
write_section_refs(
&mut sections.debug_loclists_refs,
&mut sections.debug_loclists.0,
&offsets,
)?;
Ok(offsets)
}
}
fn write_section_refs<W: Writer>(
references: &mut Vec<DebugInfoReference>,
w: &mut W,
offsets: &DebugInfoOffsets,
) -> Result<()> {
for r in references.drain(..) {
let entry_offset = offsets.entry(r.unit, r.entry).0;
debug_assert_ne!(entry_offset, 0);
w.write_offset_at(r.offset, entry_offset, SectionId::DebugInfo, r.size)?;
}
Ok(())
}
/// A unit's debugging information.
#[derive(Debug)]
pub struct Unit {
base_id: BaseId,
/// The encoding parameters for this unit.
encoding: Encoding,
/// The line number program for this unit.
pub line_program: LineProgram,
/// A table of range lists used by this unit.
pub ranges: RangeListTable,
/// A table of location lists used by this unit.
pub locations: LocationListTable,
/// All entries in this unit. The order is unrelated to the tree order.
// Requirements:
// - entries form a tree
// - entries can be added in any order
// - entries have a fixed id
// - able to quickly lookup an entry from its id
// Limitations of current implemention:
// - mutable iteration of children is messy due to borrow checker
entries: Vec<DebuggingInformationEntry>,
/// The index of the root entry in entries.
root: UnitEntryId,
}
impl Unit {
/// Create a new `Unit`.
pub fn new(encoding: Encoding, line_program: LineProgram) -> Self {
let base_id = BaseId::default();
let ranges = RangeListTable::default();
let locations = LocationListTable::default();
let mut entries = Vec::new();
let root = DebuggingInformationEntry::new(
base_id,
&mut entries,
None,
constants::DW_TAG_compile_unit,
);
Unit {
base_id,
encoding,
line_program,
ranges,
locations,
entries,
root,
}
}
/// Return the encoding parameters for this unit.
#[inline]
pub fn encoding(&self) -> Encoding {
self.encoding
}
/// Return the DWARF version for this unit.
#[inline]
pub fn version(&self) -> u16 {
self.encoding.version
}
/// Return the address size in bytes for this unit.
#[inline]
pub fn address_size(&self) -> u8 {
self.encoding.address_size
}
/// Return the DWARF format for this unit.
#[inline]
pub fn format(&self) -> Format {
self.encoding.format
}
/// Return the number of `DebuggingInformationEntry`s created for this unit.
///
/// This includes entries that no longer have a parent.
#[inline]
pub fn count(&self) -> usize {
self.entries.len()
}
/// Return the id of the root entry.
#[inline]
pub fn root(&self) -> UnitEntryId {
self.root
}
/// Add a new `DebuggingInformationEntry` to this unit and return its id.
///
/// The `parent` must be within the same unit.
///
/// # Panics
///
/// Panics if `parent` is invalid.
#[inline]
pub fn add(&mut self, parent: UnitEntryId, tag: constants::DwTag) -> UnitEntryId {
debug_assert_eq!(self.base_id, parent.base_id);
DebuggingInformationEntry::new(self.base_id, &mut self.entries, Some(parent), tag)
}
/// Get a reference to an entry.
///
/// # Panics
///
/// Panics if `id` is invalid.
#[inline]
pub fn get(&self, id: UnitEntryId) -> &DebuggingInformationEntry {
debug_assert_eq!(self.base_id, id.base_id);
&self.entries[id.index]
}
/// Get a mutable reference to an entry.
///
/// # Panics
///
/// Panics if `id` is invalid.
#[inline]
pub fn get_mut(&mut self, id: UnitEntryId) -> &mut DebuggingInformationEntry {
debug_assert_eq!(self.base_id, id.base_id);
&mut self.entries[id.index]
}
/// Return true if `self.line_program` is used by a DIE.
fn line_program_in_use(&self) -> bool {
if self.line_program.is_none() {
return false;
}
if !self.line_program.is_empty() {
return true;
}
for entry in &self.entries {
for attr in &entry.attrs {
if let AttributeValue::FileIndex(Some(_)) = attr.value {
return true;
}
}
}
false
}
/// Write the unit to the given sections.
pub(crate) fn write<W: Writer>(
&mut self,
sections: &mut Sections<W>,
abbrev_offset: DebugAbbrevOffset,
abbrevs: &mut AbbreviationTable,
line_strings: &DebugLineStrOffsets,
strings: &DebugStrOffsets,
) -> Result<UnitOffsets> {
let line_program = if self.line_program_in_use() {
self.entries[self.root.index]
.set(constants::DW_AT_stmt_list, AttributeValue::LineProgramRef);
Some(self.line_program.write(
&mut sections.debug_line,
self.encoding,
line_strings,
strings,
)?)
} else {
self.entries[self.root.index].delete(constants::DW_AT_stmt_list);
None
};
// TODO: use .debug_types for type units in DWARF v4.
let w = &mut sections.debug_info;
let mut offsets = UnitOffsets {
base_id: self.base_id,
unit: w.offset(),
// Entries can be written in any order, so create the complete vec now.
entries: vec![EntryOffset::none(); self.entries.len()],
};
let length_offset = w.write_initial_length(self.format())?;
let length_base = w.len();
w.write_u16(self.version())?;
if 2 <= self.version() && self.version() <= 4 {
w.write_offset(
abbrev_offset.0,
SectionId::DebugAbbrev,
self.format().word_size(),
)?;
w.write_u8(self.address_size())?;
} else if self.version() == 5 {
w.write_u8(constants::DW_UT_compile.0)?;
w.write_u8(self.address_size())?;
w.write_offset(
abbrev_offset.0,
SectionId::DebugAbbrev,
self.format().word_size(),
)?;
} else {
return Err(Error::UnsupportedVersion(self.version()));
}
// Calculate all DIE offsets, so that we are able to output references to them.
// However, references to base types in expressions use ULEB128, so base types
// must be moved to the front before we can calculate offsets.
self.reorder_base_types();
let mut offset = w.len();
self.entries[self.root.index].calculate_offsets(
self,
&mut offset,
&mut offsets,
abbrevs,
)?;
let range_lists = self.ranges.write(sections, self.encoding)?;
// Location lists can't be written until we have DIE offsets.
let loc_lists = self
.locations
.write(sections, self.encoding, Some(&offsets))?;
let w = &mut sections.debug_info;
let mut unit_refs = Vec::new();
self.entries[self.root.index].write(
w,
&mut sections.debug_info_refs,
&mut unit_refs,
self,
&mut offsets,
abbrevs,
line_program,
line_strings,
strings,
&range_lists,
&loc_lists,
)?;
let length = (w.len() - length_base) as u64;
w.write_initial_length_at(length_offset, length, self.format())?;
for (offset, entry) in unit_refs {
// This does not need relocation.
w.write_udata_at(
offset.0,
offsets.unit_offset(entry),
self.format().word_size(),
)?;
}
Ok(offsets)
}
/// Reorder base types to come first so that typed stack operations
/// can get their offset.
fn reorder_base_types(&mut self) {
let root = &self.entries[self.root.index];
let mut root_children = Vec::with_capacity(root.children.len());
for entry in &root.children {
if self.entries[entry.index].tag == constants::DW_TAG_base_type {
root_children.push(*entry);
}
}
for entry in &root.children {
if self.entries[entry.index].tag != constants::DW_TAG_base_type {
root_children.push(*entry);
}
}
self.entries[self.root.index].children = root_children;
}
}
/// A Debugging Information Entry (DIE).
///
/// DIEs have a set of attributes and optionally have children DIEs as well.
///
/// DIEs form a tree without any cycles. This is enforced by specifying the
/// parent when creating a DIE, and disallowing changes of parent.
#[derive(Debug)]
pub struct DebuggingInformationEntry {
id: UnitEntryId,
parent: Option<UnitEntryId>,
tag: constants::DwTag,
/// Whether to emit `DW_AT_sibling`.
sibling: bool,
attrs: Vec<Attribute>,
children: Vec<UnitEntryId>,
}
impl DebuggingInformationEntry {
/// Create a new `DebuggingInformationEntry`.
///
/// # Panics
///
/// Panics if `parent` is invalid.
#[allow(clippy::new_ret_no_self)]
fn new(
base_id: BaseId,
entries: &mut Vec<DebuggingInformationEntry>,
parent: Option<UnitEntryId>,
tag: constants::DwTag,
) -> UnitEntryId {
let id = UnitEntryId::new(base_id, entries.len());
entries.push(DebuggingInformationEntry {
id,
parent,
tag,
sibling: false,
attrs: Vec::new(),
children: Vec::new(),
});
if let Some(parent) = parent {
debug_assert_eq!(base_id, parent.base_id);
assert_ne!(parent, id);
entries[parent.index].children.push(id);
}
id
}
/// Return the id of this entry.
#[inline]
pub fn id(&self) -> UnitEntryId {
self.id
}
/// Return the parent of this entry.
#[inline]
pub fn parent(&self) -> Option<UnitEntryId> {
self.parent
}
/// Return the tag of this entry.
#[inline]
pub fn tag(&self) -> constants::DwTag {
self.tag
}
/// Return `true` if a `DW_AT_sibling` attribute will be emitted.
#[inline]
pub fn sibling(&self) -> bool {
self.sibling
}
/// Set whether a `DW_AT_sibling` attribute will be emitted.
///
/// The attribute will only be emitted if the DIE has children.
#[inline]
pub fn set_sibling(&mut self, sibling: bool) {
self.sibling = sibling;
}
/// Iterate over the attributes of this entry.
#[inline]
pub fn attrs(&self) -> slice::Iter<Attribute> {
self.attrs.iter()
}
/// Iterate over the attributes of this entry for modification.
#[inline]
pub fn attrs_mut(&mut self) -> slice::IterMut<Attribute> {
self.attrs.iter_mut()
}
/// Get an attribute.
pub fn get(&self, name: constants::DwAt) -> Option<&AttributeValue> {
self.attrs
.iter()
.find(|attr| attr.name == name)
.map(|attr| &attr.value)
}
/// Get an attribute for modification.
pub fn get_mut(&mut self, name: constants::DwAt) -> Option<&mut AttributeValue> {
self.attrs
.iter_mut()
.find(|attr| attr.name == name)
.map(|attr| &mut attr.value)
}
/// Set an attribute.
///
/// Replaces any existing attribute with the same name.
///
/// # Panics
///
/// Panics if `name` is `DW_AT_sibling`. Use `set_sibling` instead.
pub fn set(&mut self, name: constants::DwAt, value: AttributeValue) {
assert_ne!(name, constants::DW_AT_sibling);
if let Some(attr) = self.attrs.iter_mut().find(|attr| attr.name == name) {
attr.value = value;
return;
}
self.attrs.push(Attribute { name, value });
}
/// Delete an attribute.
///
/// Replaces any existing attribute with the same name.
pub fn delete(&mut self, name: constants::DwAt) {
self.attrs.retain(|x| x.name != name);
}
/// Iterate over the children of this entry.
///
/// Note: use `Unit::add` to add a new child to this entry.
#[inline]
pub fn children(&self) -> slice::Iter<UnitEntryId> {
self.children.iter()
}
/// Delete a child entry and all of its children.
pub fn delete_child(&mut self, id: UnitEntryId) {
self.children.retain(|&child| child != id);
}
/// Return the type abbreviation for this DIE.
fn abbreviation(&self, encoding: Encoding) -> Result<Abbreviation> {
let mut attrs = Vec::new();
if self.sibling && !self.children.is_empty() {
let form = match encoding.format {
Format::Dwarf32 => constants::DW_FORM_ref4,
Format::Dwarf64 => constants::DW_FORM_ref8,
};
attrs.push(AttributeSpecification::new(constants::DW_AT_sibling, form));
}
for attr in &self.attrs {
attrs.push(attr.specification(encoding)?);
}
Ok(Abbreviation::new(
self.tag,
!self.children.is_empty(),
attrs,
))
}
fn calculate_offsets(
&self,
unit: &Unit,
offset: &mut usize,
offsets: &mut UnitOffsets,
abbrevs: &mut AbbreviationTable,
) -> Result<()> {
offsets.entries[self.id.index].offset = DebugInfoOffset(*offset);
offsets.entries[self.id.index].abbrev = abbrevs.add(self.abbreviation(unit.encoding())?);
*offset += self.size(unit, offsets);
if !self.children.is_empty() {
for child in &self.children {
unit.entries[child.index].calculate_offsets(unit, offset, offsets, abbrevs)?;
}
// Null child
*offset += 1;
}
Ok(())
}
fn size(&self, unit: &Unit, offsets: &UnitOffsets) -> usize {
let mut size = uleb128_size(offsets.abbrev(self.id));
if self.sibling && !self.children.is_empty() {
size += unit.format().word_size() as usize;
}
for attr in &self.attrs {
size += attr.value.size(unit, offsets);
}
size
}
/// Write the entry to the given sections.
#[allow(clippy::too_many_arguments)]
fn write<W: Writer>(
&self,
w: &mut DebugInfo<W>,
debug_info_refs: &mut Vec<DebugInfoReference>,
unit_refs: &mut Vec<(DebugInfoOffset, UnitEntryId)>,
unit: &Unit,
offsets: &mut UnitOffsets,
abbrevs: &mut AbbreviationTable,
line_program: Option<DebugLineOffset>,
line_strings: &DebugLineStrOffsets,
strings: &DebugStrOffsets,
range_lists: &RangeListOffsets,
loc_lists: &LocationListOffsets,
) -> Result<()> {
debug_assert_eq!(offsets.debug_info_offset(self.id), w.offset());
w.write_uleb128(offsets.abbrev(self.id))?;
let sibling_offset = if self.sibling && !self.children.is_empty() {
let offset = w.offset();
w.write_udata(0, unit.format().word_size())?;
Some(offset)
} else {
None
};
for attr in &self.attrs {
attr.value.write(
w,
debug_info_refs,
unit_refs,
unit,
offsets,
line_program,
line_strings,
strings,
range_lists,
loc_lists,
)?;
}
if !self.children.is_empty() {
for child in &self.children {
unit.entries[child.index].write(
w,
debug_info_refs,
unit_refs,
unit,
offsets,
abbrevs,
line_program,
line_strings,
strings,
range_lists,
loc_lists,
)?;
}
// Null child
w.write_u8(0)?;
}
if let Some(offset) = sibling_offset {
let next_offset = (w.offset().0 - offsets.unit.0) as u64;
// This does not need relocation.
w.write_udata_at(offset.0, next_offset, unit.format().word_size())?;
}
Ok(())
}
}
/// An attribute in a `DebuggingInformationEntry`, consisting of a name and
/// associated value.
#[derive(Debug, Clone, PartialEq, Eq)]
pub struct Attribute {
name: constants::DwAt,
value: AttributeValue,
}
impl Attribute {
/// Get the name of this attribute.
#[inline]
pub fn name(&self) -> constants::DwAt {
self.name
}
/// Get the value of this attribute.
#[inline]
pub fn get(&self) -> &AttributeValue {
&self.value
}
/// Set the value of this attribute.
#[inline]
pub fn set(&mut self, value: AttributeValue) {
self.value = value;
}
/// Return the type specification for this attribute.
fn specification(&self, encoding: Encoding) -> Result<AttributeSpecification> {
Ok(AttributeSpecification::new(
self.name,
self.value.form(encoding)?,
))
}
}
/// The value of an attribute in a `DebuggingInformationEntry`.
#[derive(Debug, Clone, PartialEq, Eq)]
pub enum AttributeValue {
/// "Refers to some location in the address space of the described program."
Address(Address),
/// A slice of an arbitrary number of bytes.
Block(Vec<u8>),
/// A one byte constant data value. How to interpret the byte depends on context.
///
/// From section 7 of the standard: "Depending on context, it may be a
/// signed integer, an unsigned integer, a floating-point constant, or
/// anything else."
Data1(u8),
/// A two byte constant data value. How to interpret the bytes depends on context.
///
/// This value will be converted to the target endian before writing.
///
/// From section 7 of the standard: "Depending on context, it may be a
/// signed integer, an unsigned integer, a floating-point constant, or
/// anything else."
Data2(u16),
/// A four byte constant data value. How to interpret the bytes depends on context.
///
/// This value will be converted to the target endian before writing.
///
/// From section 7 of the standard: "Depending on context, it may be a
/// signed integer, an unsigned integer, a floating-point constant, or
/// anything else."
Data4(u32),
/// An eight byte constant data value. How to interpret the bytes depends on context.
///
/// This value will be converted to the target endian before writing.
///
/// From section 7 of the standard: "Depending on context, it may be a
/// signed integer, an unsigned integer, a floating-point constant, or
/// anything else."
Data8(u64),
/// A signed integer constant.
Sdata(i64),
/// An unsigned integer constant.
Udata(u64),
/// "The information bytes contain a DWARF expression (see Section 2.5) or
/// location description (see Section 2.6)."
Exprloc(Expression),
/// A boolean that indicates presence or absence of the attribute.
Flag(bool),
/// An attribute that is always present.
FlagPresent,
/// A reference to a `DebuggingInformationEntry` in this unit.
UnitRef(UnitEntryId),
/// A reference to a `DebuggingInformationEntry` in a potentially different unit.
DebugInfoRef(Reference),
/// An offset into the `.debug_info` section of the supplementary object file.
///
/// The API does not currently assist with generating this offset.
/// This variant will be removed from the API once support for writing
/// supplementary object files is implemented.
DebugInfoRefSup(DebugInfoOffset),
/// A reference to a line number program.
LineProgramRef,
/// A reference to a location list.
LocationListRef(LocationListId),
/// An offset into the `.debug_macinfo` section.
///
/// The API does not currently assist with generating this offset.
/// This variant will be removed from the API once support for writing
/// `.debug_macinfo` sections is implemented.
DebugMacinfoRef(DebugMacinfoOffset),
/// An offset into the `.debug_macro` section.
///
/// The API does not currently assist with generating this offset.
/// This variant will be removed from the API once support for writing
/// `.debug_macro` sections is implemented.
DebugMacroRef(DebugMacroOffset),
/// A reference to a range list.
RangeListRef(RangeListId),
/// A type signature.
///
/// The API does not currently assist with generating this signature.
/// This variant will be removed from the API once support for writing
/// `.debug_types` sections is implemented.
DebugTypesRef(DebugTypeSignature),
/// A reference to a string in the `.debug_str` section.
StringRef(StringId),
/// An offset into the `.debug_str` section of the supplementary object file.
///
/// The API does not currently assist with generating this offset.
/// This variant will be removed from the API once support for writing
/// supplementary object files is implemented.
DebugStrRefSup(DebugStrOffset),
/// A reference to a string in the `.debug_line_str` section.
LineStringRef(LineStringId),
/// A slice of bytes representing a string. Must not include null bytes.
/// Not guaranteed to be UTF-8 or anything like that.
String(Vec<u8>),
/// The value of a `DW_AT_encoding` attribute.
Encoding(constants::DwAte),
/// The value of a `DW_AT_decimal_sign` attribute.
DecimalSign(constants::DwDs),
/// The value of a `DW_AT_endianity` attribute.
Endianity(constants::DwEnd),
/// The value of a `DW_AT_accessibility` attribute.
Accessibility(constants::DwAccess),
/// The value of a `DW_AT_visibility` attribute.
Visibility(constants::DwVis),
/// The value of a `DW_AT_virtuality` attribute.
Virtuality(constants::DwVirtuality),
/// The value of a `DW_AT_language` attribute.
Language(constants::DwLang),
/// The value of a `DW_AT_address_class` attribute.
AddressClass(constants::DwAddr),
/// The value of a `DW_AT_identifier_case` attribute.
IdentifierCase(constants::DwId),
/// The value of a `DW_AT_calling_convention` attribute.
CallingConvention(constants::DwCc),
/// The value of a `DW_AT_inline` attribute.
Inline(constants::DwInl),
/// The value of a `DW_AT_ordering` attribute.
Ordering(constants::DwOrd),
/// An index into the filename entries from the line number information
/// table for the unit containing this value.
FileIndex(Option<FileId>),
}
impl AttributeValue {
/// Return the form that will be used to encode this value.
pub fn form(&self, encoding: Encoding) -> Result<constants::DwForm> {
// TODO: missing forms:
// - DW_FORM_indirect
// - DW_FORM_implicit_const
// - FW_FORM_block1/block2/block4
// - DW_FORM_str/strx1/strx2/strx3/strx4
// - DW_FORM_addrx/addrx1/addrx2/addrx3/addrx4
// - DW_FORM_data16
// - DW_FORM_line_strp
// - DW_FORM_loclistx
// - DW_FORM_rnglistx
let form = match *self {
AttributeValue::Address(_) => constants::DW_FORM_addr,
AttributeValue::Block(_) => constants::DW_FORM_block,
AttributeValue::Data1(_) => constants::DW_FORM_data1,
AttributeValue::Data2(_) => constants::DW_FORM_data2,
AttributeValue::Data4(_) => constants::DW_FORM_data4,
AttributeValue::Data8(_) => constants::DW_FORM_data8,
AttributeValue::Exprloc(_) => constants::DW_FORM_exprloc,
AttributeValue::Flag(_) => constants::DW_FORM_flag,
AttributeValue::FlagPresent => constants::DW_FORM_flag_present,
AttributeValue::UnitRef(_) => {
// Using a fixed size format lets us write a placeholder before we know
// the value.
match encoding.format {
Format::Dwarf32 => constants::DW_FORM_ref4,
Format::Dwarf64 => constants::DW_FORM_ref8,
}
}
AttributeValue::DebugInfoRef(_) => constants::DW_FORM_ref_addr,
AttributeValue::DebugInfoRefSup(_) => {
// TODO: should this depend on the size of supplementary section?
match encoding.format {
Format::Dwarf32 => constants::DW_FORM_ref_sup4,
Format::Dwarf64 => constants::DW_FORM_ref_sup8,
}
}
AttributeValue::LineProgramRef
| AttributeValue::LocationListRef(_)
| AttributeValue::DebugMacinfoRef(_)
| AttributeValue::DebugMacroRef(_)
| AttributeValue::RangeListRef(_) => {
if encoding.version == 2 || encoding.version == 3 {
match encoding.format {
Format::Dwarf32 => constants::DW_FORM_data4,
Format::Dwarf64 => constants::DW_FORM_data8,
}
} else {
constants::DW_FORM_sec_offset
}
}
AttributeValue::DebugTypesRef(_) => constants::DW_FORM_ref_sig8,
AttributeValue::StringRef(_) => constants::DW_FORM_strp,
AttributeValue::DebugStrRefSup(_) => constants::DW_FORM_strp_sup,
AttributeValue::LineStringRef(_) => constants::DW_FORM_line_strp,
AttributeValue::String(_) => constants::DW_FORM_string,
AttributeValue::Encoding(_)
| AttributeValue::DecimalSign(_)
| AttributeValue::Endianity(_)
| AttributeValue::Accessibility(_)
| AttributeValue::Visibility(_)
| AttributeValue::Virtuality(_)
| AttributeValue::Language(_)
| AttributeValue::AddressClass(_)
| AttributeValue::IdentifierCase(_)
| AttributeValue::CallingConvention(_)
| AttributeValue::Inline(_)
| AttributeValue::Ordering(_)
| AttributeValue::FileIndex(_)
| AttributeValue::Udata(_) => constants::DW_FORM_udata,
AttributeValue::Sdata(_) => constants::DW_FORM_sdata,
};
Ok(form)
}
fn size(&self, unit: &Unit, offsets: &UnitOffsets) -> usize {
macro_rules! debug_assert_form {
($form:expr) => {
debug_assert_eq!(self.form(unit.encoding()).unwrap(), $form)
};
}
match *self {
AttributeValue::Address(_) => {
debug_assert_form!(constants::DW_FORM_addr);
unit.address_size() as usize
}
AttributeValue::Block(ref val) => {
debug_assert_form!(constants::DW_FORM_block);
uleb128_size(val.len() as u64) + val.len()
}
AttributeValue::Data1(_) => {
debug_assert_form!(constants::DW_FORM_data1);
1
}
AttributeValue::Data2(_) => {
debug_assert_form!(constants::DW_FORM_data2);
2
}
AttributeValue::Data4(_) => {
debug_assert_form!(constants::DW_FORM_data4);
4
}
AttributeValue::Data8(_) => {
debug_assert_form!(constants::DW_FORM_data8);
8
}
AttributeValue::Sdata(val) => {
debug_assert_form!(constants::DW_FORM_sdata);
sleb128_size(val)
}
AttributeValue::Udata(val) => {
debug_assert_form!(constants::DW_FORM_udata);
uleb128_size(val)
}
AttributeValue::Exprloc(ref val) => {
debug_assert_form!(constants::DW_FORM_exprloc);
let size = val.size(unit.encoding(), Some(offsets));
uleb128_size(size as u64) + size
}
AttributeValue::Flag(_) => {
debug_assert_form!(constants::DW_FORM_flag);
1
}
AttributeValue::FlagPresent => {
debug_assert_form!(constants::DW_FORM_flag_present);
0
}
AttributeValue::UnitRef(_) => {
match unit.format() {
Format::Dwarf32 => debug_assert_form!(constants::DW_FORM_ref4),
Format::Dwarf64 => debug_assert_form!(constants::DW_FORM_ref8),
}
unit.format().word_size() as usize
}
AttributeValue::DebugInfoRef(_) => {
debug_assert_form!(constants::DW_FORM_ref_addr);
if unit.version() == 2 {
unit.address_size() as usize
} else {
unit.format().word_size() as usize
}
}
AttributeValue::DebugInfoRefSup(_) => {
match unit.format() {
Format::Dwarf32 => debug_assert_form!(constants::DW_FORM_ref_sup4),
Format::Dwarf64 => debug_assert_form!(constants::DW_FORM_ref_sup8),
}
unit.format().word_size() as usize
}
AttributeValue::LineProgramRef => {
if unit.version() >= 4 {
debug_assert_form!(constants::DW_FORM_sec_offset);
}
unit.format().word_size() as usize
}
AttributeValue::LocationListRef(_) => {
if unit.version() >= 4 {
debug_assert_form!(constants::DW_FORM_sec_offset);
}
unit.format().word_size() as usize
}
AttributeValue::DebugMacinfoRef(_) => {
if unit.version() >= 4 {
debug_assert_form!(constants::DW_FORM_sec_offset);
}
unit.format().word_size() as usize
}
AttributeValue::DebugMacroRef(_) => {
if unit.version() >= 4 {
debug_assert_form!(constants::DW_FORM_sec_offset);
}
unit.format().word_size() as usize
}
AttributeValue::RangeListRef(_) => {
if unit.version() >= 4 {
debug_assert_form!(constants::DW_FORM_sec_offset);
}
unit.format().word_size() as usize
}
AttributeValue::DebugTypesRef(_) => {
debug_assert_form!(constants::DW_FORM_ref_sig8);
8
}
AttributeValue::StringRef(_) => {
debug_assert_form!(constants::DW_FORM_strp);
unit.format().word_size() as usize
}
AttributeValue::DebugStrRefSup(_) => {
debug_assert_form!(constants::DW_FORM_strp_sup);
unit.format().word_size() as usize
}
AttributeValue::LineStringRef(_) => {
debug_assert_form!(constants::DW_FORM_line_strp);
unit.format().word_size() as usize
}
AttributeValue::String(ref val) => {
debug_assert_form!(constants::DW_FORM_string);
val.len() + 1
}
AttributeValue::Encoding(val) => {
debug_assert_form!(constants::DW_FORM_udata);
uleb128_size(val.0 as u64)
}
AttributeValue::DecimalSign(val) => {
debug_assert_form!(constants::DW_FORM_udata);
uleb128_size(val.0 as u64)
}
AttributeValue::Endianity(val) => {
debug_assert_form!(constants::DW_FORM_udata);
uleb128_size(val.0 as u64)
}
AttributeValue::Accessibility(val) => {
debug_assert_form!(constants::DW_FORM_udata);
uleb128_size(val.0 as u64)
}
AttributeValue::Visibility(val) => {
debug_assert_form!(constants::DW_FORM_udata);
uleb128_size(val.0 as u64)
}
AttributeValue::Virtuality(val) => {
debug_assert_form!(constants::DW_FORM_udata);
uleb128_size(val.0 as u64)
}
AttributeValue::Language(val) => {
debug_assert_form!(constants::DW_FORM_udata);
uleb128_size(val.0 as u64)
}
AttributeValue::AddressClass(val) => {
debug_assert_form!(constants::DW_FORM_udata);
uleb128_size(val.0 as u64)
}
AttributeValue::IdentifierCase(val) => {
debug_assert_form!(constants::DW_FORM_udata);
uleb128_size(val.0 as u64)
}
AttributeValue::CallingConvention(val) => {
debug_assert_form!(constants::DW_FORM_udata);
uleb128_size(val.0 as u64)
}
AttributeValue::Inline(val) => {
debug_assert_form!(constants::DW_FORM_udata);
uleb128_size(val.0 as u64)
}
AttributeValue::Ordering(val) => {
debug_assert_form!(constants::DW_FORM_udata);
uleb128_size(val.0 as u64)
}
AttributeValue::FileIndex(val) => {
debug_assert_form!(constants::DW_FORM_udata);
uleb128_size(val.map(FileId::raw).unwrap_or(0))
}
}
}
/// Write the attribute value to the given sections.
#[allow(clippy::cyclomatic_complexity, clippy::too_many_arguments)]
fn write<W: Writer>(
&self,
w: &mut DebugInfo<W>,
debug_info_refs: &mut Vec<DebugInfoReference>,
unit_refs: &mut Vec<(DebugInfoOffset, UnitEntryId)>,
unit: &Unit,
offsets: &UnitOffsets,
line_program: Option<DebugLineOffset>,
line_strings: &DebugLineStrOffsets,
strings: &DebugStrOffsets,
range_lists: &RangeListOffsets,
loc_lists: &LocationListOffsets,
) -> Result<()> {
macro_rules! debug_assert_form {
($form:expr) => {
debug_assert_eq!(self.form(unit.encoding()).unwrap(), $form)
};
}
match *self {
AttributeValue::Address(val) => {
debug_assert_form!(constants::DW_FORM_addr);
w.write_address(val, unit.address_size())?;
}
AttributeValue::Block(ref val) => {
debug_assert_form!(constants::DW_FORM_block);
w.write_uleb128(val.len() as u64)?;
w.write(&val)?;
}
AttributeValue::Data1(val) => {
debug_assert_form!(constants::DW_FORM_data1);
w.write_u8(val)?;
}
AttributeValue::Data2(val) => {
debug_assert_form!(constants::DW_FORM_data2);
w.write_u16(val)?;
}
AttributeValue::Data4(val) => {
debug_assert_form!(constants::DW_FORM_data4);
w.write_u32(val)?;
}
AttributeValue::Data8(val) => {
debug_assert_form!(constants::DW_FORM_data8);
w.write_u64(val)?;
}
AttributeValue::Sdata(val) => {
debug_assert_form!(constants::DW_FORM_sdata);
w.write_sleb128(val)?;
}
AttributeValue::Udata(val) => {
debug_assert_form!(constants::DW_FORM_udata);
w.write_uleb128(val)?;
}
AttributeValue::Exprloc(ref val) => {
debug_assert_form!(constants::DW_FORM_exprloc);
w.write_uleb128(val.size(unit.encoding(), Some(offsets)) as u64)?;
val.write(
&mut w.0,
Some(debug_info_refs),
unit.encoding(),
Some(offsets),
)?;
}
AttributeValue::Flag(val) => {
debug_assert_form!(constants::DW_FORM_flag);
w.write_u8(val as u8)?;
}
AttributeValue::FlagPresent => {
debug_assert_form!(constants::DW_FORM_flag_present);
}
AttributeValue::UnitRef(id) => {
match unit.format() {
Format::Dwarf32 => debug_assert_form!(constants::DW_FORM_ref4),
Format::Dwarf64 => debug_assert_form!(constants::DW_FORM_ref8),
}
unit_refs.push((w.offset(), id));
w.write_udata(0, unit.format().word_size())?;
}
AttributeValue::DebugInfoRef(reference) => {
debug_assert_form!(constants::DW_FORM_ref_addr);
let size = if unit.version() == 2 {
unit.address_size()
} else {
unit.format().word_size()
};
match reference {
Reference::Symbol(symbol) => w.write_reference(symbol, size)?,
Reference::Entry(unit, entry) => {
debug_info_refs.push(DebugInfoReference {
offset: w.len(),
unit,
entry,
size,
});
w.write_udata(0, size)?;
}
}
}
AttributeValue::DebugInfoRefSup(val) => {
match unit.format() {
Format::Dwarf32 => debug_assert_form!(constants::DW_FORM_ref_sup4),
Format::Dwarf64 => debug_assert_form!(constants::DW_FORM_ref_sup8),
}
w.write_udata(val.0 as u64, unit.format().word_size())?;
}
AttributeValue::LineProgramRef => {
if unit.version() >= 4 {
debug_assert_form!(constants::DW_FORM_sec_offset);
}
match line_program {
Some(line_program) => {
w.write_offset(
line_program.0,
SectionId::DebugLine,
unit.format().word_size(),
)?;
}
None => return Err(Error::InvalidAttributeValue),
}
}
AttributeValue::LocationListRef(val) => {
if unit.version() >= 4 {
debug_assert_form!(constants::DW_FORM_sec_offset);
}
let section = if unit.version() <= 4 {
SectionId::DebugLoc
} else {
SectionId::DebugLocLists
};
w.write_offset(loc_lists.get(val).0, section, unit.format().word_size())?;
}
AttributeValue::DebugMacinfoRef(val) => {
if unit.version() >= 4 {
debug_assert_form!(constants::DW_FORM_sec_offset);
}
w.write_offset(val.0, SectionId::DebugMacinfo, unit.format().word_size())?;
}
AttributeValue::DebugMacroRef(val) => {
if unit.version() >= 4 {
debug_assert_form!(constants::DW_FORM_sec_offset);
}
w.write_offset(val.0, SectionId::DebugMacro, unit.format().word_size())?;
}
AttributeValue::RangeListRef(val) => {
if unit.version() >= 4 {
debug_assert_form!(constants::DW_FORM_sec_offset);
}
let section = if unit.version() <= 4 {
SectionId::DebugRanges
} else {
SectionId::DebugRngLists
};
w.write_offset(range_lists.get(val).0, section, unit.format().word_size())?;
}
AttributeValue::DebugTypesRef(val) => {
debug_assert_form!(constants::DW_FORM_ref_sig8);
w.write_u64(val.0)?;
}
AttributeValue::StringRef(val) => {
debug_assert_form!(constants::DW_FORM_strp);
w.write_offset(
strings.get(val).0,
SectionId::DebugStr,
unit.format().word_size(),
)?;
}
AttributeValue::DebugStrRefSup(val) => {
debug_assert_form!(constants::DW_FORM_strp_sup);
w.write_udata(val.0 as u64, unit.format().word_size())?;
}
AttributeValue::LineStringRef(val) => {
debug_assert_form!(constants::DW_FORM_line_strp);
w.write_offset(
line_strings.get(val).0,
SectionId::DebugLineStr,
unit.format().word_size(),
)?;
}
AttributeValue::String(ref val) => {
debug_assert_form!(constants::DW_FORM_string);
w.write(&val)?;
w.write_u8(0)?;
}
AttributeValue::Encoding(val) => {
debug_assert_form!(constants::DW_FORM_udata);
w.write_uleb128(u64::from(val.0))?;
}
AttributeValue::DecimalSign(val) => {
debug_assert_form!(constants::DW_FORM_udata);
w.write_uleb128(u64::from(val.0))?;
}
AttributeValue::Endianity(val) => {
debug_assert_form!(constants::DW_FORM_udata);
w.write_uleb128(u64::from(val.0))?;
}
AttributeValue::Accessibility(val) => {
debug_assert_form!(constants::DW_FORM_udata);
w.write_uleb128(u64::from(val.0))?;
}
AttributeValue::Visibility(val) => {
debug_assert_form!(constants::DW_FORM_udata);
w.write_uleb128(u64::from(val.0))?;
}
AttributeValue::Virtuality(val) => {
debug_assert_form!(constants::DW_FORM_udata);
w.write_uleb128(u64::from(val.0))?;
}
AttributeValue::Language(val) => {
debug_assert_form!(constants::DW_FORM_udata);
w.write_uleb128(u64::from(val.0))?;
}
AttributeValue::AddressClass(val) => {
debug_assert_form!(constants::DW_FORM_udata);
w.write_uleb128(val.0)?;
}
AttributeValue::IdentifierCase(val) => {
debug_assert_form!(constants::DW_FORM_udata);
w.write_uleb128(u64::from(val.0))?;
}
AttributeValue::CallingConvention(val) => {
debug_assert_form!(constants::DW_FORM_udata);
w.write_uleb128(u64::from(val.0))?;
}
AttributeValue::Inline(val) => {
debug_assert_form!(constants::DW_FORM_udata);
w.write_uleb128(u64::from(val.0))?;
}
AttributeValue::Ordering(val) => {
debug_assert_form!(constants::DW_FORM_udata);
w.write_uleb128(u64::from(val.0))?;
}
AttributeValue::FileIndex(val) => {
debug_assert_form!(constants::DW_FORM_udata);
w.write_uleb128(val.map(FileId::raw).unwrap_or(0))?;
}
}
Ok(())
}
}
define_section!(
DebugInfo,
DebugInfoOffset,
"A writable `.debug_info` section."
);
/// The section offsets of all elements within a `.debug_info` section.
#[derive(Debug, Default)]
pub struct DebugInfoOffsets {
base_id: BaseId,
units: Vec<UnitOffsets>,
}
impl DebugInfoOffsets {
#[cfg(test)]
pub(crate) fn unit_offsets(&self, unit: UnitId) -> &UnitOffsets {
debug_assert_eq!(self.base_id, unit.base_id);
&self.units[unit.index]
}
/// Get the `.debug_info` section offset for the given unit.
#[inline]
pub fn unit(&self, unit: UnitId) -> DebugInfoOffset {
debug_assert_eq!(self.base_id, unit.base_id);
self.units[unit.index].unit
}
/// Get the `.debug_info` section offset for the given entry.
#[inline]
pub fn entry(&self, unit: UnitId, entry: UnitEntryId) -> DebugInfoOffset {
debug_assert_eq!(self.base_id, unit.base_id);
self.units[unit.index].debug_info_offset(entry)
}
}
/// The section offsets of all elements of a unit within a `.debug_info` section.
#[derive(Debug)]
pub(crate) struct UnitOffsets {
base_id: BaseId,
unit: DebugInfoOffset,
entries: Vec<EntryOffset>,
}
impl UnitOffsets {
#[cfg(test)]
fn none() -> Self {
UnitOffsets {
base_id: BaseId::default(),
unit: DebugInfoOffset(0),
entries: Vec::new(),
}
}
/// Get the .debug_info offset for the given entry.
#[inline]
pub(crate) fn debug_info_offset(&self, entry: UnitEntryId) -> DebugInfoOffset {
debug_assert_eq!(self.base_id, entry.base_id);
let offset = self.entries[entry.index].offset;
debug_assert_ne!(offset.0, 0);
offset
}
/// Get the unit offset for the given entry.
#[inline]
pub(crate) fn unit_offset(&self, entry: UnitEntryId) -> u64 {
let offset = self.debug_info_offset(entry);
(offset.0 - self.unit.0) as u64
}
/// Get the abbreviation code for the given entry.
#[inline]
pub(crate) fn abbrev(&self, entry: UnitEntryId) -> u64 {
debug_assert_eq!(self.base_id, entry.base_id);
self.entries[entry.index].abbrev
}
}
#[derive(Debug, Clone, Copy)]
pub(crate) struct EntryOffset {
offset: DebugInfoOffset,
abbrev: u64,
}
impl EntryOffset {
fn none() -> Self {
EntryOffset {
offset: DebugInfoOffset(0),
abbrev: 0,
}
}
}
/// A reference to a `.debug_info` entry that has yet to be resolved.
#[derive(Debug, Clone, Copy)]
pub(crate) struct DebugInfoReference {
/// The offset within the section of the reference.
pub offset: usize,
/// The size of the reference.
pub size: u8,
/// The unit containing the entry.
pub unit: UnitId,
/// The entry being referenced.
pub entry: UnitEntryId,
}
#[cfg(feature = "read")]
pub(crate) mod convert {
use super::*;
use crate::common::UnitSectionOffset;
use crate::read::{self, Reader};
use crate::write::{self, ConvertError, ConvertResult, LocationList, RangeList};
use std::collections::HashMap;
pub(crate) struct ConvertUnit<R: Reader<Offset = usize>> {
from_unit: read::Unit<R>,
base_id: BaseId,
encoding: Encoding,
entries: Vec<DebuggingInformationEntry>,
entry_offsets: Vec<read::UnitOffset>,
root: UnitEntryId,
}
pub(crate) struct ConvertUnitContext<'a, R: Reader<Offset = usize>> {
pub dwarf: &'a read::Dwarf<R>,
pub unit: &'a read::Unit<R>,
pub line_strings: &'a mut write::LineStringTable,
pub strings: &'a mut write::StringTable,
pub ranges: &'a mut write::RangeListTable,
pub locations: &'a mut write::LocationListTable,
pub convert_address: &'a dyn Fn(u64) -> Option<Address>,
pub base_address: Address,
pub line_program_offset: Option<DebugLineOffset>,
pub line_program_files: Vec<FileId>,
pub entry_ids: &'a HashMap<UnitSectionOffset, (UnitId, UnitEntryId)>,
}
impl UnitTable {
/// Create a unit table by reading the data in the given sections.
///
/// This also updates the given tables with the values that are referenced from
/// attributes in this section.
///
/// `convert_address` is a function to convert read addresses into the `Address`
/// type. For non-relocatable addresses, this function may simply return
/// `Address::Constant(address)`. For relocatable addresses, it is the caller's
/// responsibility to determine the symbol and addend corresponding to the address
/// and return `Address::Symbol { symbol, addend }`.
pub fn from<R: Reader<Offset = usize>>(
dwarf: &read::Dwarf<R>,
line_strings: &mut write::LineStringTable,
strings: &mut write::StringTable,
convert_address: &dyn Fn(u64) -> Option<Address>,
) -> ConvertResult<UnitTable> {
let base_id = BaseId::default();
let mut unit_entries = Vec::new();
let mut entry_ids = HashMap::new();
let mut from_units = dwarf.units();
while let Some(from_unit) = from_units.next()? {
let unit_id = UnitId::new(base_id, unit_entries.len());
unit_entries.push(Unit::convert_entries(
from_unit,
unit_id,
&mut entry_ids,
dwarf,
)?);
}
// Attributes must be converted in a separate pass so that we can handle
// references to other compilation units.
let mut units = Vec::new();
for unit_entries in unit_entries.drain(..) {
units.push(Unit::convert_attributes(
unit_entries,
&entry_ids,
dwarf,
line_strings,
strings,
convert_address,
)?);
}
Ok(UnitTable { base_id, units })
}
}
impl Unit {
/// Create a unit by reading the data in the input sections.
///
/// Does not add entry attributes.
#[allow(clippy::too_many_arguments)]
pub(crate) fn convert_entries<R: Reader<Offset = usize>>(
from_header: read::UnitHeader<R>,
unit_id: UnitId,
entry_ids: &mut HashMap<UnitSectionOffset, (UnitId, UnitEntryId)>,
dwarf: &read::Dwarf<R>,
) -> ConvertResult<ConvertUnit<R>> {
match from_header.type_() {
read::UnitType::Compilation => (),
_ => return Err(ConvertError::UnsupportedUnitType),
}
let base_id = BaseId::default();
let from_unit = dwarf.unit(from_header)?;
let encoding = from_unit.encoding();
let mut entries = Vec::new();
let mut entry_offsets = Vec::new();
let mut from_tree = from_unit.entries_tree(None)?;
let from_root = from_tree.root()?;
let root = DebuggingInformationEntry::convert_entry(
from_root,
&from_unit,
base_id,
&mut entries,
&mut entry_offsets,
entry_ids,
None,
unit_id,
)?;
Ok(ConvertUnit {
from_unit,
base_id,
encoding,
entries,
entry_offsets,
root,
})
}
/// Create entry attributes by reading the data in the input sections.
fn convert_attributes<R: Reader<Offset = usize>>(
unit: ConvertUnit<R>,
entry_ids: &HashMap<UnitSectionOffset, (UnitId, UnitEntryId)>,
dwarf: &read::Dwarf<R>,
line_strings: &mut write::LineStringTable,
strings: &mut write::StringTable,
convert_address: &dyn Fn(u64) -> Option<Address>,
) -> ConvertResult<Unit> {
let from_unit = unit.from_unit;
let base_address =
convert_address(from_unit.low_pc).ok_or(ConvertError::InvalidAddress)?;
let (line_program_offset, line_program, line_program_files) =
match from_unit.line_program {
Some(ref from_program) => {
let from_program = from_program.clone();
let line_program_offset = from_program.header().offset();
let (line_program, line_program_files) = LineProgram::from(
from_program,
dwarf,
line_strings,
strings,
convert_address,
)?;
(Some(line_program_offset), line_program, line_program_files)
}
None => (None, LineProgram::none(), Vec::new()),
};
let mut ranges = RangeListTable::default();
let mut locations = LocationListTable::default();
let mut context = ConvertUnitContext {
entry_ids,
dwarf,
unit: &from_unit,
line_strings,
strings,
ranges: &mut ranges,
locations: &mut locations,
convert_address,
base_address,
line_program_offset,
line_program_files,
};
let mut entries = unit.entries;
for entry in &mut entries {
entry.convert_attributes(&mut context, &unit.entry_offsets)?;
}
Ok(Unit {
base_id: unit.base_id,
encoding: unit.encoding,
line_program,
ranges,
locations,
entries,
root: unit.root,
})
}
}
impl DebuggingInformationEntry {
/// Create an entry by reading the data in the input sections.
///
/// Does not add the entry attributes.
fn convert_entry<R: Reader<Offset = usize>>(
from: read::EntriesTreeNode<R>,
from_unit: &read::Unit<R>,
base_id: BaseId,
entries: &mut Vec<DebuggingInformationEntry>,
entry_offsets: &mut Vec<read::UnitOffset>,
entry_ids: &mut HashMap<UnitSectionOffset, (UnitId, UnitEntryId)>,
parent: Option<UnitEntryId>,
unit_id: UnitId,
) -> ConvertResult<UnitEntryId> {
let from_entry = from.entry();
let id = DebuggingInformationEntry::new(base_id, entries, parent, from_entry.tag());
let offset = from_entry.offset();
entry_offsets.push(offset);
entry_ids.insert(offset.to_unit_section_offset(from_unit), (unit_id, id));
let mut from_children = from.children();
while let Some(from_child) = from_children.next()? {
DebuggingInformationEntry::convert_entry(
from_child,
from_unit,
base_id,
entries,
entry_offsets,
entry_ids,
Some(id),
unit_id,
)?;
}
Ok(id)
}
/// Create an entry's attributes by reading the data in the input sections.
fn convert_attributes<R: Reader<Offset = usize>>(
&mut self,
context: &mut ConvertUnitContext<R>,
entry_offsets: &[read::UnitOffset],
) -> ConvertResult<()> {
let offset = entry_offsets[self.id.index];
let from = context.unit.entry(offset)?;
let mut from_attrs = from.attrs();
while let Some(from_attr) = from_attrs.next()? {
if from_attr.name() == constants::DW_AT_sibling {
// This may point to a null entry, so we have to treat it differently.
self.set_sibling(true);
} else if let Some(attr) = Attribute::from(context, &from_attr)? {
self.set(attr.name, attr.value);
}
}
Ok(())
}
}
impl Attribute {
/// Create an attribute by reading the data in the given sections.
pub(crate) fn from<R: Reader<Offset = usize>>(
context: &mut ConvertUnitContext<R>,
from: &read::Attribute<R>,
) -> ConvertResult<Option<Attribute>> {
let value = AttributeValue::from(context, from.value())?;
Ok(value.map(|value| Attribute {
name: from.name(),
value,
}))
}
}
impl AttributeValue {
/// Create an attribute value by reading the data in the given sections.
pub(crate) fn from<R: Reader<Offset = usize>>(
context: &mut ConvertUnitContext<R>,
from: read::AttributeValue<R>,
) -> ConvertResult<Option<AttributeValue>> {
let to = match from {
read::AttributeValue::Addr(val) => match (context.convert_address)(val) {
Some(val) => AttributeValue::Address(val),
None => return Err(ConvertError::InvalidAddress),
},
read::AttributeValue::Block(r) => AttributeValue::Block(r.to_slice()?.into()),
read::AttributeValue::Data1(val) => AttributeValue::Data1(val),
read::AttributeValue::Data2(val) => AttributeValue::Data2(val),
read::AttributeValue::Data4(val) => AttributeValue::Data4(val),
read::AttributeValue::Data8(val) => AttributeValue::Data8(val),
read::AttributeValue::Sdata(val) => AttributeValue::Sdata(val),
read::AttributeValue::Udata(val) => AttributeValue::Udata(val),
read::AttributeValue::Exprloc(expression) => {
let expression = Expression::from(
expression,
context.unit.encoding(),
Some(context.dwarf),
Some(context.unit),
Some(context.entry_ids),
context.convert_address,
)?;
AttributeValue::Exprloc(expression)
}
// TODO: it would be nice to preserve the flag form.
read::AttributeValue::Flag(val) => AttributeValue::Flag(val),
read::AttributeValue::DebugAddrBase(_base) => {
// We convert all address indices to addresses,
// so this is unneeded.
return Ok(None);
}
read::AttributeValue::DebugAddrIndex(index) => {
let val = context.dwarf.address(context.unit, index)?;
match (context.convert_address)(val) {
Some(val) => AttributeValue::Address(val),
None => return Err(ConvertError::InvalidAddress),
}
}
read::AttributeValue::UnitRef(val) => {
if !context.unit.header.is_valid_offset(val) {
return Err(ConvertError::InvalidUnitRef);
}
let id = context
.entry_ids
.get(&val.to_unit_section_offset(context.unit))
.ok_or(ConvertError::InvalidUnitRef)?;
AttributeValue::UnitRef(id.1)
}
read::AttributeValue::DebugInfoRef(val) => {
// TODO: support relocation of this value
let id = context
.entry_ids
.get(&UnitSectionOffset::DebugInfoOffset(val))
.ok_or(ConvertError::InvalidDebugInfoRef)?;
AttributeValue::DebugInfoRef(Reference::Entry(id.0, id.1))
}
read::AttributeValue::DebugInfoRefSup(val) => AttributeValue::DebugInfoRefSup(val),
read::AttributeValue::DebugLineRef(val) => {
// There should only be the line program in the CU DIE which we've already
// converted, so check if it matches that.
if Some(val) == context.line_program_offset {
AttributeValue::LineProgramRef
} else {
return Err(ConvertError::InvalidLineRef);
}
}
read::AttributeValue::DebugMacinfoRef(val) => AttributeValue::DebugMacinfoRef(val),
read::AttributeValue::DebugMacroRef(val) => AttributeValue::DebugMacroRef(val),
read::AttributeValue::LocationListsRef(val) => {
let iter = context
.dwarf
.locations
.raw_locations(val, context.unit.encoding())?;
let loc_list = LocationList::from(iter, context)?;
let loc_id = context.locations.add(loc_list);
AttributeValue::LocationListRef(loc_id)
}
read::AttributeValue::DebugLocListsBase(_base) => {
// We convert all location list indices to offsets,
// so this is unneeded.
return Ok(None);
}
read::AttributeValue::DebugLocListsIndex(index) => {
let offset = context.dwarf.locations_offset(context.unit, index)?;
let iter = context
.dwarf
.locations
.raw_locations(offset, context.unit.encoding())?;
let loc_list = LocationList::from(iter, context)?;
let loc_id = context.locations.add(loc_list);
AttributeValue::LocationListRef(loc_id)
}
read::AttributeValue::RangeListsRef(offset) => {
let offset = context.dwarf.ranges_offset_from_raw(context.unit, offset);
let iter = context.dwarf.raw_ranges(context.unit, offset)?;
let range_list = RangeList::from(iter, context)?;
let range_id = context.ranges.add(range_list);
AttributeValue::RangeListRef(range_id)
}
read::AttributeValue::DebugRngListsBase(_base) => {
// We convert all range list indices to offsets,
// so this is unneeded.
return Ok(None);
}
read::AttributeValue::DebugRngListsIndex(index) => {
let offset = context.dwarf.ranges_offset(context.unit, index)?;
let iter = context
.dwarf
.ranges
.raw_ranges(offset, context.unit.encoding())?;
let range_list = RangeList::from(iter, context)?;
let range_id = context.ranges.add(range_list);
AttributeValue::RangeListRef(range_id)
}
read::AttributeValue::DebugTypesRef(val) => AttributeValue::DebugTypesRef(val),
read::AttributeValue::DebugStrRef(offset) => {
let r = context.dwarf.string(offset)?;
let id = context.strings.add(r.to_slice()?);
AttributeValue::StringRef(id)
}
read::AttributeValue::DebugStrRefSup(val) => AttributeValue::DebugStrRefSup(val),
read::AttributeValue::DebugStrOffsetsBase(_base) => {
// We convert all string offsets to `.debug_str` references,
// so this is unneeded.
return Ok(None);
}
read::AttributeValue::DebugStrOffsetsIndex(index) => {
let offset = context.dwarf.string_offset(context.unit, index)?;
let r = context.dwarf.string(offset)?;
let id = context.strings.add(r.to_slice()?);
AttributeValue::StringRef(id)
}
read::AttributeValue::DebugLineStrRef(offset) => {
let r = context.dwarf.line_string(offset)?;
let id = context.line_strings.add(r.to_slice()?);
AttributeValue::LineStringRef(id)
}
read::AttributeValue::String(r) => AttributeValue::String(r.to_slice()?.into()),
read::AttributeValue::Encoding(val) => AttributeValue::Encoding(val),
read::AttributeValue::DecimalSign(val) => AttributeValue::DecimalSign(val),
read::AttributeValue::Endianity(val) => AttributeValue::Endianity(val),
read::AttributeValue::Accessibility(val) => AttributeValue::Accessibility(val),
read::AttributeValue::Visibility(val) => AttributeValue::Visibility(val),
read::AttributeValue::Virtuality(val) => AttributeValue::Virtuality(val),
read::AttributeValue::Language(val) => AttributeValue::Language(val),
read::AttributeValue::AddressClass(val) => AttributeValue::AddressClass(val),
read::AttributeValue::IdentifierCase(val) => AttributeValue::IdentifierCase(val),
read::AttributeValue::CallingConvention(val) => {
AttributeValue::CallingConvention(val)
}
read::AttributeValue::Inline(val) => AttributeValue::Inline(val),
read::AttributeValue::Ordering(val) => AttributeValue::Ordering(val),
read::AttributeValue::FileIndex(val) => {
if val == 0 {
// 0 means not specified, even for version 5.
AttributeValue::FileIndex(None)
} else {
match context.line_program_files.get(val as usize) {
Some(id) => AttributeValue::FileIndex(Some(*id)),
None => return Err(ConvertError::InvalidFileIndex),
}
}
}
// Should always be a more specific section reference.
read::AttributeValue::SecOffset(_) => {
return Err(ConvertError::InvalidAttributeValue);
}
read::AttributeValue::DwoId(DwoId(val)) => AttributeValue::Udata(val),
};
Ok(Some(to))
}
}
}
#[cfg(test)]
#[cfg(feature = "read")]
mod tests {
use super::*;
use crate::common::{
DebugAddrBase, DebugLocListsBase, DebugRngListsBase, DebugStrOffsetsBase, LineEncoding,
};
use crate::constants;
use crate::read;
use crate::write::{
DebugLine, DebugLineStr, DebugStr, DwarfUnit, EndianVec, LineString, LineStringTable,
Location, LocationList, LocationListTable, Range, RangeList, RangeListOffsets,
RangeListTable, StringTable,
};
use crate::LittleEndian;
use std::collections::HashMap;
use std::mem;
#[test]
#[allow(clippy::cyclomatic_complexity)]
fn test_unit_table() {
let mut strings = StringTable::default();
let mut units = UnitTable::default();
let unit_id1 = units.add(Unit::new(
Encoding {
version: 4,
address_size: 8,
format: Format::Dwarf32,
},
LineProgram::none(),
));
let unit2 = units.add(Unit::new(
Encoding {
version: 2,
address_size: 4,
format: Format::Dwarf64,
},
LineProgram::none(),
));
let unit3 = units.add(Unit::new(
Encoding {
version: 5,
address_size: 4,
format: Format::Dwarf32,
},
LineProgram::none(),
));
assert_eq!(units.count(), 3);
{
let unit1 = units.get_mut(unit_id1);
assert_eq!(unit1.version(), 4);
assert_eq!(unit1.address_size(), 8);
assert_eq!(unit1.format(), Format::Dwarf32);
assert_eq!(unit1.count(), 1);
let root_id = unit1.root();
assert_eq!(root_id, UnitEntryId::new(unit1.base_id, 0));
{
let root = unit1.get_mut(root_id);
assert_eq!(root.id(), root_id);
assert!(root.parent().is_none());
assert_eq!(root.tag(), constants::DW_TAG_compile_unit);
// Test get/get_mut
assert!(root.get(constants::DW_AT_producer).is_none());
assert!(root.get_mut(constants::DW_AT_producer).is_none());
let mut producer = AttributeValue::String(b"root"[..].into());
root.set(constants::DW_AT_producer, producer.clone());
assert_eq!(root.get(constants::DW_AT_producer), Some(&producer));
assert_eq!(root.get_mut(constants::DW_AT_producer), Some(&mut producer));
// Test attrs
let mut attrs = root.attrs();
let attr = attrs.next().unwrap();
assert_eq!(attr.name(), constants::DW_AT_producer);
assert_eq!(attr.get(), &producer);
assert!(attrs.next().is_none());
}
let child1 = unit1.add(root_id, constants::DW_TAG_subprogram);
assert_eq!(child1, UnitEntryId::new(unit1.base_id, 1));
{
let child1 = unit1.get_mut(child1);
assert_eq!(child1.parent(), Some(root_id));
let tmp = AttributeValue::String(b"tmp"[..].into());
child1.set(constants::DW_AT_name, tmp.clone());
assert_eq!(child1.get(constants::DW_AT_name), Some(&tmp));
// Test attrs_mut
let name = AttributeValue::StringRef(strings.add(&b"child1"[..]));
{
let attr = child1.attrs_mut().next().unwrap();
assert_eq!(attr.name(), constants::DW_AT_name);
attr.set(name.clone());
}
assert_eq!(child1.get(constants::DW_AT_name), Some(&name));
}
let child2 = unit1.add(root_id, constants::DW_TAG_subprogram);
assert_eq!(child2, UnitEntryId::new(unit1.base_id, 2));
{
let child2 = unit1.get_mut(child2);
assert_eq!(child2.parent(), Some(root_id));
let tmp = AttributeValue::String(b"tmp"[..].into());
child2.set(constants::DW_AT_name, tmp.clone());
assert_eq!(child2.get(constants::DW_AT_name), Some(&tmp));
// Test replace
let name = AttributeValue::StringRef(strings.add(&b"child2"[..]));
child2.set(constants::DW_AT_name, name.clone());
assert_eq!(child2.get(constants::DW_AT_name), Some(&name));
}
{
let root = unit1.get(root_id);
assert_eq!(
root.children().cloned().collect::<Vec<_>>(),
vec![child1, child2]
);
}
}
{
let unit2 = units.get(unit2);
assert_eq!(unit2.version(), 2);
assert_eq!(unit2.address_size(), 4);
assert_eq!(unit2.format(), Format::Dwarf64);
assert_eq!(unit2.count(), 1);
let root = unit2.root();
assert_eq!(root, UnitEntryId::new(unit2.base_id, 0));
let root = unit2.get(root);
assert_eq!(root.id(), UnitEntryId::new(unit2.base_id, 0));
assert!(root.parent().is_none());
assert_eq!(root.tag(), constants::DW_TAG_compile_unit);
}
let mut sections = Sections::new(EndianVec::new(LittleEndian));
let debug_line_str_offsets = DebugLineStrOffsets::none();
let debug_str_offsets = strings.write(&mut sections.debug_str).unwrap();
units
.write(&mut sections, &debug_line_str_offsets, &debug_str_offsets)
.unwrap();
println!("{:?}", sections.debug_str);
println!("{:?}", sections.debug_info);
println!("{:?}", sections.debug_abbrev);
let dwarf = read::Dwarf {
debug_abbrev: read::DebugAbbrev::new(sections.debug_abbrev.slice(), LittleEndian),
debug_info: read::DebugInfo::new(sections.debug_info.slice(), LittleEndian),
debug_str: read::DebugStr::new(sections.debug_str.slice(), LittleEndian),
..Default::default()
};
let mut read_units = dwarf.units();
{
let read_unit1 = read_units.next().unwrap().unwrap();
let unit1 = units.get(unit_id1);
assert_eq!(unit1.version(), read_unit1.version());
assert_eq!(unit1.address_size(), read_unit1.address_size());
assert_eq!(unit1.format(), read_unit1.format());
let read_unit1 = dwarf.unit(read_unit1).unwrap();
let mut read_entries = read_unit1.entries();
let root = unit1.get(unit1.root());
{
let (depth, read_root) = read_entries.next_dfs().unwrap().unwrap();
assert_eq!(depth, 0);
assert_eq!(root.tag(), read_root.tag());
assert!(read_root.has_children());
let producer = match root.get(constants::DW_AT_producer).unwrap() {
AttributeValue::String(ref producer) => &**producer,
otherwise => panic!("unexpected {:?}", otherwise),
};
assert_eq!(producer, b"root");
let read_producer = read_root
.attr_value(constants::DW_AT_producer)
.unwrap()
.unwrap();
assert_eq!(
dwarf
.attr_string(&read_unit1, read_producer)
.unwrap()
.slice(),
producer
);
}
let mut children = root.children().cloned();
{
let child = children.next().unwrap();
assert_eq!(child, UnitEntryId::new(unit1.base_id, 1));
let child = unit1.get(child);
let (depth, read_child) = read_entries.next_dfs().unwrap().unwrap();
assert_eq!(depth, 1);
assert_eq!(child.tag(), read_child.tag());
assert!(!read_child.has_children());
let name = match child.get(constants::DW_AT_name).unwrap() {
AttributeValue::StringRef(name) => *name,
otherwise => panic!("unexpected {:?}", otherwise),
};
let name = strings.get(name);
assert_eq!(name, b"child1");
let read_name = read_child
.attr_value(constants::DW_AT_name)
.unwrap()
.unwrap();
assert_eq!(
dwarf.attr_string(&read_unit1, read_name).unwrap().slice(),
name
);
}
{
let child = children.next().unwrap();
assert_eq!(child, UnitEntryId::new(unit1.base_id, 2));
let child = unit1.get(child);
let (depth, read_child) = read_entries.next_dfs().unwrap().unwrap();
assert_eq!(depth, 0);
assert_eq!(child.tag(), read_child.tag());
assert!(!read_child.has_children());
let name = match child.get(constants::DW_AT_name).unwrap() {
AttributeValue::StringRef(name) => *name,
otherwise => panic!("unexpected {:?}", otherwise),
};
let name = strings.get(name);
assert_eq!(name, b"child2");
let read_name = read_child
.attr_value(constants::DW_AT_name)
.unwrap()
.unwrap();
assert_eq!(
dwarf.attr_string(&read_unit1, read_name).unwrap().slice(),
name
);
}
assert!(read_entries.next_dfs().unwrap().is_none());
}
{
let read_unit2 = read_units.next().unwrap().unwrap();
let unit2 = units.get(unit2);
assert_eq!(unit2.version(), read_unit2.version());
assert_eq!(unit2.address_size(), read_unit2.address_size());
assert_eq!(unit2.format(), read_unit2.format());
let abbrevs = dwarf.abbreviations(&read_unit2).unwrap();
let mut read_entries = read_unit2.entries(&abbrevs);
{
let root = unit2.get(unit2.root());
let (depth, read_root) = read_entries.next_dfs().unwrap().unwrap();
assert_eq!(depth, 0);
assert_eq!(root.tag(), read_root.tag());
assert!(!read_root.has_children());
}
assert!(read_entries.next_dfs().unwrap().is_none());
}
{
let read_unit3 = read_units.next().unwrap().unwrap();
let unit3 = units.get(unit3);
assert_eq!(unit3.version(), read_unit3.version());
assert_eq!(unit3.address_size(), read_unit3.address_size());
assert_eq!(unit3.format(), read_unit3.format());
let abbrevs = dwarf.abbreviations(&read_unit3).unwrap();
let mut read_entries = read_unit3.entries(&abbrevs);
{
let root = unit3.get(unit3.root());
let (depth, read_root) = read_entries.next_dfs().unwrap().unwrap();
assert_eq!(depth, 0);
assert_eq!(root.tag(), read_root.tag());
assert!(!read_root.has_children());
}
assert!(read_entries.next_dfs().unwrap().is_none());
}
assert!(read_units.next().unwrap().is_none());
let mut convert_line_strings = LineStringTable::default();
let mut convert_strings = StringTable::default();
let convert_units = UnitTable::from(
&dwarf,
&mut convert_line_strings,
&mut convert_strings,
&|address| Some(Address::Constant(address)),
)
.unwrap();
assert_eq!(convert_units.count(), units.count());
for i in 0..convert_units.count() {
let unit_id = units.id(i);
let unit = units.get(unit_id);
let convert_unit_id = convert_units.id(i);
let convert_unit = convert_units.get(convert_unit_id);
assert_eq!(convert_unit.version(), unit.version());
assert_eq!(convert_unit.address_size(), unit.address_size());
assert_eq!(convert_unit.format(), unit.format());
assert_eq!(convert_unit.count(), unit.count());
let root = unit.get(unit.root());
let convert_root = convert_unit.get(convert_unit.root());
assert_eq!(convert_root.tag(), root.tag());
for (convert_attr, attr) in convert_root.attrs().zip(root.attrs()) {
assert_eq!(convert_attr, attr);
}
}
}
#[test]
fn test_attribute_value() {
// Create a string table and a string with a non-zero id/offset.
let mut strings = StringTable::default();
strings.add("string one");
let string_id = strings.add("string two");
let mut debug_str = DebugStr::from(EndianVec::new(LittleEndian));
let debug_str_offsets = strings.write(&mut debug_str).unwrap();
let read_debug_str = read::DebugStr::new(debug_str.slice(), LittleEndian);
let mut line_strings = LineStringTable::default();
line_strings.add("line string one");
let line_string_id = line_strings.add("line string two");
let mut debug_line_str = DebugLineStr::from(EndianVec::new(LittleEndian));
let debug_line_str_offsets = line_strings.write(&mut debug_line_str).unwrap();
let read_debug_line_str =
read::DebugLineStr::from(read::EndianSlice::new(debug_line_str.slice(), LittleEndian));
let data = vec![1, 2, 3, 4];
let read_data = read::EndianSlice::new(&[1, 2, 3, 4], LittleEndian);
let mut expression = Expression::new();
expression.op_constu(57);
let read_expression = read::Expression(read::EndianSlice::new(
&[constants::DW_OP_constu.0, 57],
LittleEndian,
));
let mut ranges = RangeListTable::default();
let range_id = ranges.add(RangeList(vec![Range::StartEnd {
begin: Address::Constant(0x1234),
end: Address::Constant(0x2345),
}]));
let mut locations = LocationListTable::default();
let loc_id = locations.add(LocationList(vec![Location::StartEnd {
begin: Address::Constant(0x1234),
end: Address::Constant(0x2345),
data: expression.clone(),
}]));
for &version in &[2, 3, 4, 5] {
for &address_size in &[4, 8] {
for &format in &[Format::Dwarf32, Format::Dwarf64] {
let encoding = Encoding {
format,
version,
address_size,
};
let mut sections = Sections::new(EndianVec::new(LittleEndian));
let range_list_offsets = ranges.write(&mut sections, encoding).unwrap();
let loc_list_offsets = locations.write(&mut sections, encoding, None).unwrap();
let read_debug_ranges =
read::DebugRanges::new(sections.debug_ranges.slice(), LittleEndian);
let read_debug_rnglists =
read::DebugRngLists::new(sections.debug_rnglists.slice(), LittleEndian);
let read_debug_loc =
read::DebugLoc::new(sections.debug_loc.slice(), LittleEndian);
let read_debug_loclists =
read::DebugLocLists::new(sections.debug_loclists.slice(), LittleEndian);
let mut units = UnitTable::default();
let unit = units.add(Unit::new(encoding, LineProgram::none()));
let unit = units.get(unit);
let encoding = Encoding {
format,
version,
address_size,
};
let from_unit = read::UnitHeader::new(
encoding,
0,
read::UnitType::Compilation,
DebugAbbrevOffset(0),
DebugInfoOffset(0).into(),
read::EndianSlice::new(&[], LittleEndian),
);
for &(ref name, ref value, ref expect_value) in &[
(
constants::DW_AT_name,
AttributeValue::Address(Address::Constant(0x1234)),
read::AttributeValue::Addr(0x1234),
),
(
constants::DW_AT_name,
AttributeValue::Block(data.clone()),
read::AttributeValue::Block(read_data),
),
(
constants::DW_AT_name,
AttributeValue::Data1(0x12),
read::AttributeValue::Data1(0x12),
),
(
constants::DW_AT_name,
AttributeValue::Data2(0x1234),
read::AttributeValue::Data2(0x1234),
),
(
constants::DW_AT_name,
AttributeValue::Data4(0x1234),
read::AttributeValue::Data4(0x1234),
),
(
constants::DW_AT_name,
AttributeValue::Data8(0x1234),
read::AttributeValue::Data8(0x1234),
),
(
constants::DW_AT_name,
AttributeValue::Sdata(0x1234),
read::AttributeValue::Sdata(0x1234),
),
(
constants::DW_AT_name,
AttributeValue::Udata(0x1234),
read::AttributeValue::Udata(0x1234),
),
(
constants::DW_AT_name,
AttributeValue::Exprloc(expression.clone()),
read::AttributeValue::Exprloc(read_expression),
),
(
constants::DW_AT_name,
AttributeValue::Flag(false),
read::AttributeValue::Flag(false),
),
/*
(
constants::DW_AT_name,
AttributeValue::FlagPresent,
read::AttributeValue::Flag(true),
),
*/
(
constants::DW_AT_name,
AttributeValue::DebugInfoRefSup(DebugInfoOffset(0x1234)),
read::AttributeValue::DebugInfoRefSup(DebugInfoOffset(0x1234)),
),
(
constants::DW_AT_location,
AttributeValue::LocationListRef(loc_id),
read::AttributeValue::SecOffset(loc_list_offsets.get(loc_id).0),
),
(
constants::DW_AT_macro_info,
AttributeValue::DebugMacinfoRef(DebugMacinfoOffset(0x1234)),
read::AttributeValue::SecOffset(0x1234),
),
(
constants::DW_AT_macros,
AttributeValue::DebugMacroRef(DebugMacroOffset(0x1234)),
read::AttributeValue::SecOffset(0x1234),
),
(
constants::DW_AT_ranges,
AttributeValue::RangeListRef(range_id),
read::AttributeValue::SecOffset(range_list_offsets.get(range_id).0),
),
(
constants::DW_AT_name,
AttributeValue::DebugTypesRef(DebugTypeSignature(0x1234)),
read::AttributeValue::DebugTypesRef(DebugTypeSignature(0x1234)),
),
(
constants::DW_AT_name,
AttributeValue::StringRef(string_id),
read::AttributeValue::DebugStrRef(debug_str_offsets.get(string_id)),
),
(
constants::DW_AT_name,
AttributeValue::DebugStrRefSup(DebugStrOffset(0x1234)),
read::AttributeValue::DebugStrRefSup(DebugStrOffset(0x1234)),
),
(
constants::DW_AT_name,
AttributeValue::LineStringRef(line_string_id),
read::AttributeValue::DebugLineStrRef(
debug_line_str_offsets.get(line_string_id),
),
),
(
constants::DW_AT_name,
AttributeValue::String(data.clone()),
read::AttributeValue::String(read_data),
),
(
constants::DW_AT_encoding,
AttributeValue::Encoding(constants::DwAte(0x12)),
read::AttributeValue::Udata(0x12),
),
(
constants::DW_AT_decimal_sign,
AttributeValue::DecimalSign(constants::DwDs(0x12)),
read::AttributeValue::Udata(0x12),
),
(
constants::DW_AT_endianity,
AttributeValue::Endianity(constants::DwEnd(0x12)),
read::AttributeValue::Udata(0x12),
),
(
constants::DW_AT_accessibility,
AttributeValue::Accessibility(constants::DwAccess(0x12)),
read::AttributeValue::Udata(0x12),
),
(
constants::DW_AT_visibility,
AttributeValue::Visibility(constants::DwVis(0x12)),
read::AttributeValue::Udata(0x12),
),
(
constants::DW_AT_virtuality,
AttributeValue::Virtuality(constants::DwVirtuality(0x12)),
read::AttributeValue::Udata(0x12),
),
(
constants::DW_AT_language,
AttributeValue::Language(constants::DwLang(0x12)),
read::AttributeValue::Udata(0x12),
),
(
constants::DW_AT_address_class,
AttributeValue::AddressClass(constants::DwAddr(0x12)),
read::AttributeValue::Udata(0x12),
),
(
constants::DW_AT_identifier_case,
AttributeValue::IdentifierCase(constants::DwId(0x12)),
read::AttributeValue::Udata(0x12),
),
(
constants::DW_AT_calling_convention,
AttributeValue::CallingConvention(constants::DwCc(0x12)),
read::AttributeValue::Udata(0x12),
),
(
constants::DW_AT_ordering,
AttributeValue::Ordering(constants::DwOrd(0x12)),
read::AttributeValue::Udata(0x12),
),
(
constants::DW_AT_inline,
AttributeValue::Inline(constants::DwInl(0x12)),
read::AttributeValue::Udata(0x12),
),
][..]
{
let form = value.form(encoding).unwrap();
let attr = Attribute {
name: *name,
value: value.clone(),
};
let offsets = UnitOffsets::none();
let line_program_offset = None;
let mut debug_info_refs = Vec::new();
let mut unit_refs = Vec::new();
let mut debug_info = DebugInfo::from(EndianVec::new(LittleEndian));
attr.value
.write(
&mut debug_info,
&mut debug_info_refs,
&mut unit_refs,
&unit,
&offsets,
line_program_offset,
&debug_line_str_offsets,
&debug_str_offsets,
&range_list_offsets,
&loc_list_offsets,
)
.unwrap();
let spec = read::AttributeSpecification::new(*name, form, None);
let mut r = read::EndianSlice::new(debug_info.slice(), LittleEndian);
let read_attr = read::parse_attribute(&mut r, encoding, spec).unwrap();
let read_value = &read_attr.raw_value();
// read::AttributeValue is invariant in the lifetime of R.
// The lifetimes here are all okay, so transmute it.
let read_value = unsafe {
mem::transmute::<
&read::AttributeValue<read::EndianSlice<LittleEndian>>,
&read::AttributeValue<read::EndianSlice<LittleEndian>>,
>(read_value)
};
assert_eq!(read_value, expect_value);
let dwarf = read::Dwarf {
debug_str: read_debug_str.clone(),
debug_line_str: read_debug_line_str.clone(),
ranges: read::RangeLists::new(read_debug_ranges, read_debug_rnglists),
locations: read::LocationLists::new(
read_debug_loc,
read_debug_loclists,
),
..Default::default()
};
let unit = read::Unit {
header: from_unit,
abbreviations: read::Abbreviations::default(),
name: None,
comp_dir: None,
low_pc: 0,
str_offsets_base: DebugStrOffsetsBase(0),
addr_base: DebugAddrBase(0),
loclists_base: DebugLocListsBase(0),
rnglists_base: DebugRngListsBase(0),
line_program: None,
dwo_id: None,
};
let mut context = convert::ConvertUnitContext {
dwarf: &dwarf,
unit: &unit,
line_strings: &mut line_strings,
strings: &mut strings,
ranges: &mut ranges,
locations: &mut locations,
convert_address: &|address| Some(Address::Constant(address)),
base_address: Address::Constant(0),
line_program_offset: None,
line_program_files: Vec::new(),
entry_ids: &HashMap::new(),
};
let convert_attr =
Attribute::from(&mut context, &read_attr).unwrap().unwrap();
assert_eq!(convert_attr, attr);
}
}
}
}
}
#[test]
#[allow(clippy::cyclomatic_complexity)]
fn test_unit_ref() {
let mut units = UnitTable::default();
let unit_id1 = units.add(Unit::new(
Encoding {
version: 4,
address_size: 8,
format: Format::Dwarf32,
},
LineProgram::none(),
));
assert_eq!(unit_id1, units.id(0));
let unit_id2 = units.add(Unit::new(
Encoding {
version: 2,
address_size: 4,
format: Format::Dwarf64,
},
LineProgram::none(),
));
assert_eq!(unit_id2, units.id(1));
let unit1_child1 = UnitEntryId::new(units.get(unit_id1).base_id, 1);
let unit1_child2 = UnitEntryId::new(units.get(unit_id1).base_id, 2);
let unit2_child1 = UnitEntryId::new(units.get(unit_id2).base_id, 1);
let unit2_child2 = UnitEntryId::new(units.get(unit_id2).base_id, 2);
{
let unit1 = units.get_mut(unit_id1);
let root = unit1.root();
let child_id1 = unit1.add(root, constants::DW_TAG_subprogram);
assert_eq!(child_id1, unit1_child1);
let child_id2 = unit1.add(root, constants::DW_TAG_subprogram);
assert_eq!(child_id2, unit1_child2);
{
let child1 = unit1.get_mut(child_id1);
child1.set(constants::DW_AT_type, AttributeValue::UnitRef(child_id2));
}
{
let child2 = unit1.get_mut(child_id2);
child2.set(
constants::DW_AT_type,
AttributeValue::DebugInfoRef(Reference::Entry(unit_id2, unit2_child1)),
);
}
}
{
let unit2 = units.get_mut(unit_id2);
let root = unit2.root();
let child_id1 = unit2.add(root, constants::DW_TAG_subprogram);
assert_eq!(child_id1, unit2_child1);
let child_id2 = unit2.add(root, constants::DW_TAG_subprogram);
assert_eq!(child_id2, unit2_child2);
{
let child1 = unit2.get_mut(child_id1);
child1.set(constants::DW_AT_type, AttributeValue::UnitRef(child_id2));
}
{
let child2 = unit2.get_mut(child_id2);
child2.set(
constants::DW_AT_type,
AttributeValue::DebugInfoRef(Reference::Entry(unit_id1, unit1_child1)),
);
}
}
let debug_line_str_offsets = DebugLineStrOffsets::none();
let debug_str_offsets = DebugStrOffsets::none();
let mut sections = Sections::new(EndianVec::new(LittleEndian));
let debug_info_offsets = units
.write(&mut sections, &debug_line_str_offsets, &debug_str_offsets)
.unwrap();
println!("{:?}", sections.debug_info);
println!("{:?}", sections.debug_abbrev);
let dwarf = read::Dwarf {
debug_abbrev: read::DebugAbbrev::new(sections.debug_abbrev.slice(), LittleEndian),
debug_info: read::DebugInfo::new(sections.debug_info.slice(), LittleEndian),
..Default::default()
};
let mut read_units = dwarf.units();
{
let read_unit1 = read_units.next().unwrap().unwrap();
assert_eq!(
read_unit1.offset(),
debug_info_offsets.unit(unit_id1).into()
);
let abbrevs = dwarf.abbreviations(&read_unit1).unwrap();
let mut read_entries = read_unit1.entries(&abbrevs);
{
let (_, _read_root) = read_entries.next_dfs().unwrap().unwrap();
}
{
let (_, read_child1) = read_entries.next_dfs().unwrap().unwrap();
let offset = debug_info_offsets
.entry(unit_id1, unit1_child2)
.to_unit_offset(&read_unit1)
.unwrap();
assert_eq!(
read_child1.attr_value(constants::DW_AT_type).unwrap(),
Some(read::AttributeValue::UnitRef(offset))
);
}
{
let (_, read_child2) = read_entries.next_dfs().unwrap().unwrap();
let offset = debug_info_offsets.entry(unit_id2, unit2_child1);
assert_eq!(
read_child2.attr_value(constants::DW_AT_type).unwrap(),
Some(read::AttributeValue::DebugInfoRef(offset))
);
}
}
{
let read_unit2 = read_units.next().unwrap().unwrap();
assert_eq!(
read_unit2.offset(),
debug_info_offsets.unit(unit_id2).into()
);
let abbrevs = dwarf.abbreviations(&read_unit2).unwrap();
let mut read_entries = read_unit2.entries(&abbrevs);
{
let (_, _read_root) = read_entries.next_dfs().unwrap().unwrap();
}
{
let (_, read_child1) = read_entries.next_dfs().unwrap().unwrap();
let offset = debug_info_offsets
.entry(unit_id2, unit2_child2)
.to_unit_offset(&read_unit2)
.unwrap();
assert_eq!(
read_child1.attr_value(constants::DW_AT_type).unwrap(),
Some(read::AttributeValue::UnitRef(offset))
);
}
{
let (_, read_child2) = read_entries.next_dfs().unwrap().unwrap();
let offset = debug_info_offsets.entry(unit_id1, unit1_child1);
assert_eq!(
read_child2.attr_value(constants::DW_AT_type).unwrap(),
Some(read::AttributeValue::DebugInfoRef(offset))
);
}
}
let mut convert_line_strings = LineStringTable::default();
let mut convert_strings = StringTable::default();
let convert_units = UnitTable::from(
&dwarf,
&mut convert_line_strings,
&mut convert_strings,
&|address| Some(Address::Constant(address)),
)
.unwrap();
assert_eq!(convert_units.count(), units.count());
for i in 0..convert_units.count() {
let unit = units.get(units.id(i));
let convert_unit = convert_units.get(convert_units.id(i));
assert_eq!(convert_unit.version(), unit.version());
assert_eq!(convert_unit.address_size(), unit.address_size());
assert_eq!(convert_unit.format(), unit.format());
assert_eq!(convert_unit.count(), unit.count());
let root = unit.get(unit.root());
let convert_root = convert_unit.get(convert_unit.root());
assert_eq!(convert_root.tag(), root.tag());
for (convert_attr, attr) in convert_root.attrs().zip(root.attrs()) {
assert_eq!(convert_attr, attr);
}
let child1 = unit.get(UnitEntryId::new(unit.base_id, 1));
let convert_child1 = convert_unit.get(UnitEntryId::new(convert_unit.base_id, 1));
assert_eq!(convert_child1.tag(), child1.tag());
for (convert_attr, attr) in convert_child1.attrs().zip(child1.attrs()) {
assert_eq!(convert_attr.name, attr.name);
match (convert_attr.value.clone(), attr.value.clone()) {
(
AttributeValue::DebugInfoRef(Reference::Entry(convert_unit, convert_entry)),
AttributeValue::DebugInfoRef(Reference::Entry(unit, entry)),
) => {
assert_eq!(convert_unit.index, unit.index);
assert_eq!(convert_entry.index, entry.index);
}
(AttributeValue::UnitRef(convert_id), AttributeValue::UnitRef(id)) => {
assert_eq!(convert_id.index, id.index);
}
(convert_value, value) => assert_eq!(convert_value, value),
}
}
let child2 = unit.get(UnitEntryId::new(unit.base_id, 2));
let convert_child2 = convert_unit.get(UnitEntryId::new(convert_unit.base_id, 2));
assert_eq!(convert_child2.tag(), child2.tag());
for (convert_attr, attr) in convert_child2.attrs().zip(child2.attrs()) {
assert_eq!(convert_attr.name, attr.name);
match (convert_attr.value.clone(), attr.value.clone()) {
(
AttributeValue::DebugInfoRef(Reference::Entry(convert_unit, convert_entry)),
AttributeValue::DebugInfoRef(Reference::Entry(unit, entry)),
) => {
assert_eq!(convert_unit.index, unit.index);
assert_eq!(convert_entry.index, entry.index);
}
(AttributeValue::UnitRef(convert_id), AttributeValue::UnitRef(id)) => {
assert_eq!(convert_id.index, id.index);
}
(convert_value, value) => assert_eq!(convert_value, value),
}
}
}
}
#[test]
fn test_sibling() {
fn add_child(
unit: &mut Unit,
parent: UnitEntryId,
tag: constants::DwTag,
name: &str,
) -> UnitEntryId {
let id = unit.add(parent, tag);
let child = unit.get_mut(id);
child.set(constants::DW_AT_name, AttributeValue::String(name.into()));
child.set_sibling(true);
id
}
fn add_children(units: &mut UnitTable, unit_id: UnitId) {
let unit = units.get_mut(unit_id);
let root = unit.root();
let child1 = add_child(unit, root, constants::DW_TAG_subprogram, "child1");
add_child(unit, child1, constants::DW_TAG_variable, "grandchild1");
add_child(unit, root, constants::DW_TAG_subprogram, "child2");
add_child(unit, root, constants::DW_TAG_subprogram, "child3");
}
fn next_child<R: read::Reader<Offset = usize>>(
entries: &mut read::EntriesCursor<R>,
) -> (read::UnitOffset, Option<read::UnitOffset>) {
let (_, entry) = entries.next_dfs().unwrap().unwrap();
let offset = entry.offset();
let sibling =
entry
.attr_value(constants::DW_AT_sibling)
.unwrap()
.map(|attr| match attr {
read::AttributeValue::UnitRef(offset) => offset,
_ => panic!("bad sibling value"),
});
(offset, sibling)
}
fn check_sibling<R: read::Reader<Offset = usize>>(
unit: &read::UnitHeader<R>,
debug_abbrev: &read::DebugAbbrev<R>,
) {
let abbrevs = unit.abbreviations(debug_abbrev).unwrap();
let mut entries = unit.entries(&abbrevs);
// root
entries.next_dfs().unwrap().unwrap();
// child1
let (_, sibling1) = next_child(&mut entries);
// grandchild1
entries.next_dfs().unwrap().unwrap();
// child2
let (offset2, sibling2) = next_child(&mut entries);
// child3
let (_, _) = next_child(&mut entries);
assert_eq!(sibling1, Some(offset2));
assert_eq!(sibling2, None);
}
let encoding = Encoding {
format: Format::Dwarf32,
version: 4,
address_size: 8,
};
let mut units = UnitTable::default();
let unit_id1 = units.add(Unit::new(encoding, LineProgram::none()));
add_children(&mut units, unit_id1);
let unit_id2 = units.add(Unit::new(encoding, LineProgram::none()));
add_children(&mut units, unit_id2);
let debug_line_str_offsets = DebugLineStrOffsets::none();
let debug_str_offsets = DebugStrOffsets::none();
let mut sections = Sections::new(EndianVec::new(LittleEndian));
units
.write(&mut sections, &debug_line_str_offsets, &debug_str_offsets)
.unwrap();
println!("{:?}", sections.debug_info);
println!("{:?}", sections.debug_abbrev);
let read_debug_info = read::DebugInfo::new(sections.debug_info.slice(), LittleEndian);
let read_debug_abbrev = read::DebugAbbrev::new(sections.debug_abbrev.slice(), LittleEndian);
let mut read_units = read_debug_info.units();
check_sibling(&read_units.next().unwrap().unwrap(), &read_debug_abbrev);
check_sibling(&read_units.next().unwrap().unwrap(), &read_debug_abbrev);
}
#[test]
fn test_line_ref() {
for &version in &[2, 3, 4, 5] {
for &address_size in &[4, 8] {
for &format in &[Format::Dwarf32, Format::Dwarf64] {
let encoding = Encoding {
format,
version,
address_size,
};
// The line program we'll be referencing.
let mut line_program = LineProgram::new(
encoding,
LineEncoding::default(),
LineString::String(b"comp_dir".to_vec()),
LineString::String(b"comp_name".to_vec()),
None,
);
let dir = line_program.default_directory();
let file1 =
line_program.add_file(LineString::String(b"file1".to_vec()), dir, None);
let file2 =
line_program.add_file(LineString::String(b"file2".to_vec()), dir, None);
// Write, read, and convert the line program, so that we have the info
// required to convert the attributes.
let line_strings = DebugLineStrOffsets::none();
let strings = DebugStrOffsets::none();
let mut debug_line = DebugLine::from(EndianVec::new(LittleEndian));
let line_program_offset = line_program
.write(&mut debug_line, encoding, &line_strings, &strings)
.unwrap();
let read_debug_line = read::DebugLine::new(debug_line.slice(), LittleEndian);
let read_line_program = read_debug_line
.program(
line_program_offset,
address_size,
Some(read::EndianSlice::new(b"comp_dir", LittleEndian)),
Some(read::EndianSlice::new(b"comp_name", LittleEndian)),
)
.unwrap();
let dwarf = read::Dwarf::default();
let mut convert_line_strings = LineStringTable::default();
let mut convert_strings = StringTable::default();
let (_, line_program_files) = LineProgram::from(
read_line_program,
&dwarf,
&mut convert_line_strings,
&mut convert_strings,
&|address| Some(Address::Constant(address)),
)
.unwrap();
// Fake the unit.
let mut units = UnitTable::default();
let unit = units.add(Unit::new(encoding, LineProgram::none()));
let unit = units.get(unit);
let from_unit = read::UnitHeader::new(
encoding,
0,
read::UnitType::Compilation,
DebugAbbrevOffset(0),
DebugInfoOffset(0).into(),
read::EndianSlice::new(&[], LittleEndian),
);
for &(ref name, ref value, ref expect_value) in &[
(
constants::DW_AT_stmt_list,
AttributeValue::LineProgramRef,
read::AttributeValue::SecOffset(line_program_offset.0),
),
(
constants::DW_AT_decl_file,
AttributeValue::FileIndex(Some(file1)),
read::AttributeValue::Udata(file1.raw()),
),
(
constants::DW_AT_decl_file,
AttributeValue::FileIndex(Some(file2)),
read::AttributeValue::Udata(file2.raw()),
),
][..]
{
let mut ranges = RangeListTable::default();
let mut locations = LocationListTable::default();
let mut strings = StringTable::default();
let mut line_strings = LineStringTable::default();
let form = value.form(encoding).unwrap();
let attr = Attribute {
name: *name,
value: value.clone(),
};
let mut debug_info_refs = Vec::new();
let mut unit_refs = Vec::new();
let mut debug_info = DebugInfo::from(EndianVec::new(LittleEndian));
let offsets = UnitOffsets::none();
let debug_line_str_offsets = DebugLineStrOffsets::none();
let debug_str_offsets = DebugStrOffsets::none();
let range_list_offsets = RangeListOffsets::none();
let loc_list_offsets = LocationListOffsets::none();
attr.value
.write(
&mut debug_info,
&mut debug_info_refs,
&mut unit_refs,
&unit,
&offsets,
Some(line_program_offset),
&debug_line_str_offsets,
&debug_str_offsets,
&range_list_offsets,
&loc_list_offsets,
)
.unwrap();
let spec = read::AttributeSpecification::new(*name, form, None);
let mut r = read::EndianSlice::new(debug_info.slice(), LittleEndian);
let read_attr = read::parse_attribute(&mut r, encoding, spec).unwrap();
let read_value = &read_attr.raw_value();
// read::AttributeValue is invariant in the lifetime of R.
// The lifetimes here are all okay, so transmute it.
let read_value = unsafe {
mem::transmute::<
&read::AttributeValue<read::EndianSlice<LittleEndian>>,
&read::AttributeValue<read::EndianSlice<LittleEndian>>,
>(read_value)
};
assert_eq!(read_value, expect_value);
let unit = read::Unit {
header: from_unit,
abbreviations: read::Abbreviations::default(),
name: None,
comp_dir: None,
low_pc: 0,
str_offsets_base: DebugStrOffsetsBase(0),
addr_base: DebugAddrBase(0),
loclists_base: DebugLocListsBase(0),
rnglists_base: DebugRngListsBase(0),
line_program: None,
dwo_id: None,
};
let mut context = convert::ConvertUnitContext {
dwarf: &dwarf,
unit: &unit,
line_strings: &mut line_strings,
strings: &mut strings,
ranges: &mut ranges,
locations: &mut locations,
convert_address: &|address| Some(Address::Constant(address)),
base_address: Address::Constant(0),
line_program_offset: Some(line_program_offset),
line_program_files: line_program_files.clone(),
entry_ids: &HashMap::new(),
};
let convert_attr =
Attribute::from(&mut context, &read_attr).unwrap().unwrap();
assert_eq!(convert_attr, attr);
}
}
}
}
}
#[test]
fn test_line_program_used() {
for used in vec![false, true] {
let encoding = Encoding {
format: Format::Dwarf32,
version: 5,
address_size: 8,
};
let line_program = LineProgram::new(
encoding,
LineEncoding::default(),
LineString::String(b"comp_dir".to_vec()),
LineString::String(b"comp_name".to_vec()),
None,
);
let mut unit = Unit::new(encoding, line_program);
let file_id = if used { Some(FileId::new(0)) } else { None };
let root = unit.root();
unit.get_mut(root).set(
constants::DW_AT_decl_file,
AttributeValue::FileIndex(file_id),
);
let mut units = UnitTable::default();
units.add(unit);
let debug_line_str_offsets = DebugLineStrOffsets::none();
let debug_str_offsets = DebugStrOffsets::none();
let mut sections = Sections::new(EndianVec::new(LittleEndian));
units
.write(&mut sections, &debug_line_str_offsets, &debug_str_offsets)
.unwrap();
assert_eq!(!used, sections.debug_line.slice().is_empty());
}
}
#[test]
fn test_delete_child() {
fn set_name(unit: &mut Unit, id: UnitEntryId, name: &str) {
let entry = unit.get_mut(id);
entry.set(constants::DW_AT_name, AttributeValue::String(name.into()));
}
fn check_name<R: read::Reader>(
entry: &read::DebuggingInformationEntry<R>,
debug_str: &read::DebugStr<R>,
name: &str,
) {
let name_attr = entry.attr(constants::DW_AT_name).unwrap().unwrap();
let entry_name = name_attr.string_value(debug_str).unwrap();
let entry_name_str = entry_name.to_string().unwrap();
assert_eq!(entry_name_str, name);
}
let encoding = Encoding {
format: Format::Dwarf32,
version: 4,
address_size: 8,
};
let mut dwarf = DwarfUnit::new(encoding);
let root = dwarf.unit.root();
// Add and delete entries in the root unit
let child1 = dwarf.unit.add(root, constants::DW_TAG_subprogram);
set_name(&mut dwarf.unit, child1, "child1");
let grandchild1 = dwarf.unit.add(child1, constants::DW_TAG_variable);
set_name(&mut dwarf.unit, grandchild1, "grandchild1");
let child2 = dwarf.unit.add(root, constants::DW_TAG_subprogram);
set_name(&mut dwarf.unit, child2, "child2");
// This deletes both `child1` and its child `grandchild1`
dwarf.unit.get_mut(root).delete_child(child1);
let child3 = dwarf.unit.add(root, constants::DW_TAG_subprogram);
set_name(&mut dwarf.unit, child3, "child3");
let child4 = dwarf.unit.add(root, constants::DW_TAG_subprogram);
set_name(&mut dwarf.unit, child4, "child4");
let grandchild4 = dwarf.unit.add(child4, constants::DW_TAG_variable);
set_name(&mut dwarf.unit, grandchild4, "grandchild4");
dwarf.unit.get_mut(child4).delete_child(grandchild4);
let mut sections = Sections::new(EndianVec::new(LittleEndian));
// Write DWARF data which should only include `child2`, `child3` and `child4`
dwarf.write(&mut sections).unwrap();
let read_debug_info = read::DebugInfo::new(sections.debug_info.slice(), LittleEndian);
let read_debug_abbrev = read::DebugAbbrev::new(sections.debug_abbrev.slice(), LittleEndian);
let read_debug_str = read::DebugStr::new(sections.debug_str.slice(), LittleEndian);
let read_unit = read_debug_info.units().next().unwrap().unwrap();
let abbrevs = read_unit.abbreviations(&read_debug_abbrev).unwrap();
let mut entries = read_unit.entries(&abbrevs);
// root
entries.next_dfs().unwrap().unwrap();
// child2
let (_, read_child2) = entries.next_dfs().unwrap().unwrap();
check_name(read_child2, &read_debug_str, "child2");
// child3
let (_, read_child3) = entries.next_dfs().unwrap().unwrap();
check_name(read_child3, &read_debug_str, "child3");
// child4
let (_, read_child4) = entries.next_dfs().unwrap().unwrap();
check_name(read_child4, &read_debug_str, "child4");
// There should be no more entries
assert!(entries.next_dfs().unwrap().is_none());
}
}