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// Copyright 2021-2023 Vector 35 Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
use gimli::{
constants, Attribute, AttributeValue, AttributeValue::UnitRef, DebuggingInformationEntry,
Dwarf, Operation, Reader, Unit, UnitOffset, UnitSectionOffset,
};
use std::ffi::CString;
pub(crate) fn get_uid<R: Reader<Offset = usize>>(
unit: &Unit<R>,
entry: &DebuggingInformationEntry<R>,
) -> usize {
match entry.offset().to_unit_section_offset(unit) {
UnitSectionOffset::DebugInfoOffset(o) => o.0,
UnitSectionOffset::DebugTypesOffset(o) => o.0,
}
}
////////////////////////////////////
// DIE attr convenience functions
pub fn resolve_specification<R: Reader<Offset = usize>>(
unit: &Unit<R>,
entry: &DebuggingInformationEntry<R>,
) -> UnitOffset {
if let Ok(Some(UnitRef(offset))) = entry.attr_value(constants::DW_AT_specification) {
resolve_specification(unit, &unit.entry(offset).unwrap())
} else if let Ok(Some(UnitRef(offset))) = entry.attr_value(constants::DW_AT_abstract_origin) {
resolve_specification(unit, &unit.entry(offset).unwrap())
} else {
entry.offset()
}
}
// Get name from DIE, or referenced dependencies
pub(crate) fn get_name<R: Reader<Offset = usize>>(
dwarf: &Dwarf<R>,
unit: &Unit<R>,
entry: &DebuggingInformationEntry<R>,
) -> Option<CString> {
let entry = unit.entry(resolve_specification(unit, entry)).unwrap();
if let Ok(Some(attr_val)) = entry.attr_value(constants::DW_AT_name) {
if let Ok(attr_string) = dwarf.attr_string(unit, attr_val) {
if let Ok(attr_string) = attr_string.to_string() {
return Some(CString::new(attr_string.to_string()).unwrap());
}
}
}
None
}
// Get raw name from DIE, or referenced dependencies
pub(crate) fn get_raw_name<R: Reader>(
dwarf: &Dwarf<R>,
unit: &Unit<R>,
entry: &DebuggingInformationEntry<R>,
) -> Option<CString> {
if let Ok(Some(attr_val)) = entry.attr_value(constants::DW_AT_linkage_name) {
if let Ok(attr_string) = dwarf.attr_string(unit, attr_val) {
if let Ok(attr_string) = attr_string.to_string() {
Some(CString::new(attr_string.to_string()).unwrap())
} else {
None
}
} else {
None
}
} else {
None
}
}
// Get the size of an object as a usize
pub(crate) fn get_size_as_usize<R: Reader>(entry: &DebuggingInformationEntry<R>) -> Option<usize> {
if let Ok(Some(attr)) = entry.attr(constants::DW_AT_byte_size) {
get_attr_as_usize(attr)
} else if let Ok(Some(attr)) = entry.attr(constants::DW_AT_bit_size) {
get_attr_as_usize(attr).map(|attr_value| attr_value / 8)
} else {
None
}
}
// Get the size of an object as a u64
pub(crate) fn get_size_as_u64<R: Reader>(entry: &DebuggingInformationEntry<R>) -> Option<u64> {
if let Ok(Some(attr)) = entry.attr(constants::DW_AT_byte_size) {
get_attr_as_u64(&attr)
} else if let Ok(Some(attr)) = entry.attr(constants::DW_AT_bit_size) {
get_attr_as_u64(&attr).map(|attr_value| attr_value / 8)
} else {
None
}
}
// Get the size of a subrange as a u64
pub(crate) fn get_subrange_size<R: Reader>(entry: &DebuggingInformationEntry<R>) -> u64 {
if let Ok(Some(attr)) = entry.attr(constants::DW_AT_upper_bound) {
get_attr_as_u64(&attr).map_or(0, |v| v + 1)
} else if let Ok(Some(attr)) = entry.attr(constants::DW_AT_count) {
get_attr_as_u64(&attr).unwrap_or(0)
} else if let Ok(Some(attr)) = entry.attr(constants::DW_AT_lower_bound) {
get_attr_as_u64(&attr).map_or(0, |v| v + 1)
} else {
0
}
}
// Get the start address of a function
pub(crate) fn get_start_address<R: Reader>(
dwarf: &Dwarf<R>,
unit: &Unit<R>,
entry: &DebuggingInformationEntry<R>,
) -> Option<u64> {
if let Ok(Some(attr_val)) = entry.attr_value(constants::DW_AT_low_pc) {
match dwarf.attr_address(unit, attr_val) {
Ok(Some(val)) => Some(val),
_ => None,
}
} else if let Ok(Some(attr_val)) = entry.attr_value(constants::DW_AT_entry_pc) {
match dwarf.attr_address(unit, attr_val) {
Ok(Some(val)) => Some(val),
_ => None,
}
} else if let Ok(Some(attr_value)) = entry.attr_value(constants::DW_AT_ranges) {
if let Ok(Some(ranges_offset)) = dwarf.attr_ranges_offset(unit, attr_value) {
if let Ok(mut ranges) = dwarf.ranges(unit, ranges_offset) {
if let Ok(Some(range)) = ranges.next() {
return Some(range.begin);
}
}
}
return None;
} else {
None
}
}
// Get an attribute value as a u64 if it can be coerced
pub(crate) fn get_attr_as_u64<R: Reader>(attr: &Attribute<R>) -> Option<u64> {
if let Some(value) = attr.u8_value() {
Some(value.into())
} else if let Some(value) = attr.u16_value() {
Some(value.into())
} else if let Some(value) = attr.udata_value() {
Some(value)
} else {
attr.sdata_value().map(|value| value as u64)
}
}
// Get an attribute value as a usize if it can be coerced
pub(crate) fn get_attr_as_usize<R: Reader>(attr: Attribute<R>) -> Option<usize> {
if let Some(value) = attr.u8_value() {
Some(value.into())
} else if let Some(value) = attr.u16_value() {
Some(value.into())
} else if let Some(value) = attr.udata_value() {
Some(value as usize)
} else {
attr.sdata_value().map(|value| value as usize)
}
}
// Get an attribute value as a usize if it can be coerced
// Parses DW_OP_address, DW_OP_const
pub(crate) fn get_expr_value<R: Reader>(unit: &Unit<R>, attr: Attribute<R>) -> Option<u64> {
if let AttributeValue::Exprloc(mut expression) = attr.value() {
match Operation::parse(&mut expression.0, unit.encoding()).unwrap() {
Operation::PlusConstant { value } => Some(value),
Operation::UnsignedConstant { value } => Some(value),
Operation::Address { address: 0 } => None,
Operation::Address { address } => Some(address),
_ => None,
}
} else {
None
}
}
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