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//! Handling of everything related to debuginfo.
mod emit;
mod line_info;
mod object;
mod unwind;
use crate::prelude::*;
use cranelift_codegen::ir::Endianness;
use cranelift_codegen::isa::TargetIsa;
use gimli::write::{
Address, AttributeValue, DwarfUnit, FileId, LineProgram, LineString, Range, RangeList,
UnitEntryId,
};
use gimli::{Encoding, Format, LineEncoding, RunTimeEndian};
use indexmap::IndexSet;
pub(crate) use emit::{DebugReloc, DebugRelocName};
pub(crate) use unwind::UnwindContext;
pub(crate) struct DebugContext {
endian: RunTimeEndian,
dwarf: DwarfUnit,
unit_range_list: RangeList,
}
pub(crate) struct FunctionDebugContext {
entry_id: UnitEntryId,
function_source_loc: (FileId, u64, u64),
source_loc_set: indexmap::IndexSet<(FileId, u64, u64)>,
}
impl DebugContext {
pub(crate) fn new(tcx: TyCtxt<'_>, isa: &dyn TargetIsa) -> Self {
let encoding = Encoding {
format: Format::Dwarf32,
// FIXME this should be configurable
// macOS doesn't seem to support DWARF > 3
// 5 version is required for md5 file hash
version: if tcx.sess.target.is_like_osx {
3
} else {
// FIXME change to version 5 once the gdb and lldb shipping with the latest debian
// support it.
4
},
address_size: isa.frontend_config().pointer_bytes(),
};
let endian = match isa.endianness() {
Endianness::Little => RunTimeEndian::Little,
Endianness::Big => RunTimeEndian::Big,
};
let mut dwarf = DwarfUnit::new(encoding);
let producer = format!(
"cg_clif (rustc {}, cranelift {})",
rustc_interface::util::rustc_version_str().unwrap_or("unknown version"),
cranelift_codegen::VERSION,
);
let comp_dir = tcx
.sess
.opts
.working_dir
.to_string_lossy(FileNameDisplayPreference::Remapped)
.into_owned();
let (name, file_info) = match tcx.sess.local_crate_source_file() {
Some(path) => {
let name = path.to_string_lossy().into_owned();
(name, None)
}
None => (tcx.crate_name(LOCAL_CRATE).to_string(), None),
};
let mut line_program = LineProgram::new(
encoding,
LineEncoding::default(),
LineString::new(comp_dir.as_bytes(), encoding, &mut dwarf.line_strings),
LineString::new(name.as_bytes(), encoding, &mut dwarf.line_strings),
file_info,
);
line_program.file_has_md5 = file_info.is_some();
dwarf.unit.line_program = line_program;
{
let name = dwarf.strings.add(name);
let comp_dir = dwarf.strings.add(comp_dir);
let root = dwarf.unit.root();
let root = dwarf.unit.get_mut(root);
root.set(gimli::DW_AT_producer, AttributeValue::StringRef(dwarf.strings.add(producer)));
root.set(gimli::DW_AT_language, AttributeValue::Language(gimli::DW_LANG_Rust));
root.set(gimli::DW_AT_name, AttributeValue::StringRef(name));
root.set(gimli::DW_AT_comp_dir, AttributeValue::StringRef(comp_dir));
root.set(gimli::DW_AT_low_pc, AttributeValue::Address(Address::Constant(0)));
}
DebugContext { endian, dwarf, unit_range_list: RangeList(Vec::new()) }
}
pub(crate) fn define_function(
&mut self,
tcx: TyCtxt<'_>,
name: &str,
function_span: Span,
) -> FunctionDebugContext {
let (file, line, column) = DebugContext::get_span_loc(tcx, function_span, function_span);
let file_id = self.add_source_file(&file);
// FIXME: add to appropriate scope instead of root
let scope = self.dwarf.unit.root();
let entry_id = self.dwarf.unit.add(scope, gimli::DW_TAG_subprogram);
let entry = self.dwarf.unit.get_mut(entry_id);
let name_id = self.dwarf.strings.add(name);
// Gdb requires DW_AT_name. Otherwise the DW_TAG_subprogram is skipped.
entry.set(gimli::DW_AT_name, AttributeValue::StringRef(name_id));
entry.set(gimli::DW_AT_linkage_name, AttributeValue::StringRef(name_id));
entry.set(gimli::DW_AT_decl_file, AttributeValue::FileIndex(Some(file_id)));
entry.set(gimli::DW_AT_decl_line, AttributeValue::Udata(line));
entry.set(gimli::DW_AT_decl_column, AttributeValue::Udata(column));
FunctionDebugContext {
entry_id,
function_source_loc: (file_id, line, column),
source_loc_set: IndexSet::new(),
}
}
}
impl FunctionDebugContext {
pub(crate) fn finalize(
mut self,
debug_context: &mut DebugContext,
func_id: FuncId,
context: &Context,
) {
let symbol = func_id.as_u32() as usize;
let end = self.create_debug_lines(debug_context, symbol, context);
debug_context.unit_range_list.0.push(Range::StartLength {
begin: Address::Symbol { symbol, addend: 0 },
length: u64::from(end),
});
let func_entry = debug_context.dwarf.unit.get_mut(self.entry_id);
// Gdb requires both DW_AT_low_pc and DW_AT_high_pc. Otherwise the DW_TAG_subprogram is skipped.
func_entry.set(
gimli::DW_AT_low_pc,
AttributeValue::Address(Address::Symbol { symbol, addend: 0 }),
);
// Using Udata for DW_AT_high_pc requires at least DWARF4
func_entry.set(gimli::DW_AT_high_pc, AttributeValue::Udata(u64::from(end)));
}
}
|
