use super::address_transform::AddressTransform;
use super::attr::clone_attr_string;
use super::{Reader, TransformError};
use anyhow::Error;
use cranelift_entity::EntityRef;
use gimli::{
write, DebugLine, DebugLineOffset, DebugStr, DebuggingInformationEntry, LineEncoding, Unit,
};
use more_asserts::assert_le;
use std::collections::BTreeMap;
use std::iter::FromIterator;
#[derive(Debug)]
enum SavedLineProgramRow {
Normal {
address: u64,
op_index: u64,
file_index: u64,
line: u64,
column: u64,
discriminator: u64,
is_stmt: bool,
basic_block: bool,
prologue_end: bool,
epilogue_begin: bool,
isa: u64,
},
EndOfSequence(u64),
}
#[derive(Debug, Eq, PartialEq)]
enum ReadLineProgramState {
SequenceEnded,
ReadSequence,
IgnoreSequence,
}
pub(crate) fn clone_line_program<R>(
unit: &Unit<R, R::Offset>,
root: &DebuggingInformationEntry<R>,
addr_tr: &AddressTransform,
out_encoding: gimli::Encoding,
debug_str: &DebugStr<R>,
debug_line: &DebugLine<R>,
out_strings: &mut write::StringTable,
) -> Result<(write::LineProgram, DebugLineOffset, Vec<write::FileId>), Error>
where
R: Reader,
{
let offset = match root.attr_value(gimli::DW_AT_stmt_list)? {
Some(gimli::AttributeValue::DebugLineRef(offset)) => offset,
_ => {
return Err(TransformError("Debug line offset is not found").into());
}
};
let comp_dir = root.attr_value(gimli::DW_AT_comp_dir)?;
let comp_name = root.attr_value(gimli::DW_AT_name)?;
let out_comp_dir = clone_attr_string(
comp_dir.as_ref().expect("comp_dir"),
gimli::DW_FORM_strp,
debug_str,
out_strings,
)?;
let out_comp_name = clone_attr_string(
comp_name.as_ref().expect("comp_name"),
gimli::DW_FORM_strp,
debug_str,
out_strings,
)?;
let program = debug_line.program(
offset,
unit.header.address_size(),
comp_dir.and_then(|val| val.string_value(&debug_str)),
comp_name.and_then(|val| val.string_value(&debug_str)),
);
if let Ok(program) = program {
let header = program.header();
assert_le!(header.version(), 4, "not supported 5");
let line_encoding = LineEncoding {
minimum_instruction_length: header.minimum_instruction_length(),
maximum_operations_per_instruction: header.maximum_operations_per_instruction(),
default_is_stmt: header.default_is_stmt(),
line_base: header.line_base(),
line_range: header.line_range(),
};
let mut out_program = write::LineProgram::new(
out_encoding,
line_encoding,
out_comp_dir,
out_comp_name,
None,
);
let mut dirs = Vec::new();
dirs.push(out_program.default_directory());
for dir_attr in header.include_directories() {
let dir_id = out_program.add_directory(clone_attr_string(
dir_attr,
gimli::DW_FORM_string,
debug_str,
out_strings,
)?);
dirs.push(dir_id);
}
let mut files = Vec::new();
for file_entry in header.file_names() {
let dir_id = dirs[file_entry.directory_index() as usize];
let file_id = out_program.add_file(
clone_attr_string(
&file_entry.path_name(),
gimli::DW_FORM_string,
debug_str,
out_strings,
)?,
dir_id,
None,
);
files.push(file_id);
}
let mut rows = program.rows();
let mut saved_rows = BTreeMap::new();
let mut state = ReadLineProgramState::SequenceEnded;
while let Some((_header, row)) = rows.next_row()? {
if state == ReadLineProgramState::IgnoreSequence {
if row.end_sequence() {
state = ReadLineProgramState::SequenceEnded;
}
continue;
}
let saved_row = if row.end_sequence() {
state = ReadLineProgramState::SequenceEnded;
SavedLineProgramRow::EndOfSequence(row.address())
} else {
if state == ReadLineProgramState::SequenceEnded {
if row.address() == 0 {
state = ReadLineProgramState::IgnoreSequence;
continue;
}
state = ReadLineProgramState::ReadSequence;
}
SavedLineProgramRow::Normal {
address: row.address(),
op_index: row.op_index(),
file_index: row.file_index(),
line: row.line().unwrap_or(0),
column: match row.column() {
gimli::ColumnType::LeftEdge => 0,
gimli::ColumnType::Column(val) => val,
},
discriminator: row.discriminator(),
is_stmt: row.is_stmt(),
basic_block: row.basic_block(),
prologue_end: row.prologue_end(),
epilogue_begin: row.epilogue_begin(),
isa: row.isa(),
}
};
saved_rows.insert(row.address(), saved_row);
}
let saved_rows = Vec::from_iter(saved_rows.into_iter());
for (i, map) in addr_tr.map() {
if map.len == 0 {
continue; }
let symbol = i.index();
let base_addr = map.offset;
out_program.begin_sequence(Some(write::Address::Symbol { symbol, addend: 0 }));
let mut last_address = None;
for addr_map in map.addresses.iter() {
let saved_row = match saved_rows.binary_search_by_key(&addr_map.wasm, |i| i.0) {
Ok(i) => Some(&saved_rows[i].1),
Err(i) => {
if i > 0 {
Some(&saved_rows[i - 1].1)
} else {
None
}
}
};
if let Some(SavedLineProgramRow::Normal {
address,
op_index,
file_index,
line,
column,
discriminator,
is_stmt,
basic_block,
prologue_end,
epilogue_begin,
isa,
}) = saved_row
{
if Some(*address) != last_address {
let address_offset = if last_address.is_none() {
0
} else {
(addr_map.generated - base_addr) as u64
};
out_program.row().address_offset = address_offset;
out_program.row().op_index = *op_index;
out_program.row().file = files[(file_index - 1) as usize];
out_program.row().line = *line;
out_program.row().column = *column;
out_program.row().discriminator = *discriminator;
out_program.row().is_statement = *is_stmt;
out_program.row().basic_block = *basic_block;
out_program.row().prologue_end = *prologue_end;
out_program.row().epilogue_begin = *epilogue_begin;
out_program.row().isa = *isa;
out_program.generate_row();
last_address = Some(*address);
}
}
}
let end_addr = (map.offset + map.len - 1) as u64;
out_program.end_sequence(end_addr);
}
Ok((out_program, offset, files))
} else {
Err(TransformError("Valid line program not found").into())
}
}