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