Implement line debuginfo for AArch64
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6387df14df
commit
9d6f65ea14
@ -6,6 +6,7 @@ use crate::prelude::*;
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use rustc_span::{FileName, SourceFile, SourceFileAndLine, Pos, SourceFileHash, SourceFileHashAlgorithm};
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use cranelift_codegen::binemit::CodeOffset;
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use cranelift_codegen::machinst::MachSrcLoc;
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use gimli::write::{
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Address, AttributeValue, FileId, LineProgram, LineString, FileInfo, LineStringTable, UnitEntryId,
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@ -128,18 +129,8 @@ impl<'a, 'tcx> FunctionDebugContext<'a, 'tcx> {
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source_info_set: &indexmap::IndexSet<SourceInfo>,
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) -> CodeOffset {
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let tcx = self.debug_context.tcx;
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let line_program = &mut self.debug_context.dwarf.unit.line_program;
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line_program.begin_sequence(Some(Address::Symbol {
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symbol: self.symbol,
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addend: 0,
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}));
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let encinfo = isa.encoding_info();
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let func = &context.func;
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let mut blocks = func.layout.blocks().collect::<Vec<_>>();
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blocks.sort_by_key(|block| func.offsets[*block]); // Ensure inst offsets always increase
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let line_strings = &mut self.debug_context.dwarf.line_strings;
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let function_span = self.mir.span;
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@ -197,7 +188,40 @@ impl<'a, 'tcx> FunctionDebugContext<'a, 'tcx> {
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line_program.generate_row();
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};
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let mut end = 0;
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line_program.begin_sequence(Some(Address::Symbol {
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symbol: self.symbol,
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addend: 0,
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}));
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let mut func_end = 0;
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if let Some(ref mcr) = &context.mach_compile_result {
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for &MachSrcLoc { start, end, loc } in mcr.sections.get_srclocs_sorted() {
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// FIXME get_srclocs_sorted omits default srclocs
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if func_end < start {
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line_program.row().address_offset = func_end as u64;
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create_row_for_span(line_program, self.mir.span);
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}
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line_program.row().address_offset = start as u64;
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if !loc.is_default() {
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let source_info = *source_info_set.get_index(loc.bits() as usize).unwrap();
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create_row_for_span(line_program, source_info.span);
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} else {
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create_row_for_span(line_program, self.mir.span);
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}
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func_end = end;
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}
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// FIXME get_srclocs_sorted omits default srclocs
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if func_end < mcr.sections.total_size() {
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line_program.row().address_offset = func_end as u64;
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create_row_for_span(line_program, self.mir.span);
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func_end = mcr.sections.total_size();
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}
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} else {
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let encinfo = isa.encoding_info();
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let mut blocks = func.layout.blocks().collect::<Vec<_>>();
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blocks.sort_by_key(|block| func.offsets[*block]); // Ensure inst offsets always increase
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for block in blocks {
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for (offset, inst, size) in func.inst_offsets(block, &encinfo) {
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let srcloc = func.srclocs[inst];
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@ -208,11 +232,14 @@ impl<'a, 'tcx> FunctionDebugContext<'a, 'tcx> {
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} else {
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create_row_for_span(line_program, self.mir.span);
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}
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end = offset + size;
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func_end = offset + size;
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}
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}
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}
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line_program.end_sequence(end as u64);
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assert_ne!(func_end, 0);
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line_program.end_sequence(func_end as u64);
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let entry = self.debug_context.dwarf.unit.get_mut(self.entry_id);
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entry.set(
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@ -222,11 +249,11 @@ impl<'a, 'tcx> FunctionDebugContext<'a, 'tcx> {
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addend: 0,
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}),
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);
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entry.set(gimli::DW_AT_high_pc, AttributeValue::Udata(end as u64));
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entry.set(gimli::DW_AT_high_pc, AttributeValue::Udata(func_end as u64));
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self.debug_context
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.emit_location(self.entry_id, self.mir.span);
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end
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func_end
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}
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}
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@ -312,10 +312,6 @@ impl<'a, 'tcx> FunctionDebugContext<'a, 'tcx> {
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source_info_set: &indexmap::IndexSet<SourceInfo>,
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local_map: FxHashMap<mir::Local, CPlace<'tcx>>,
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) {
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if isa.get_mach_backend().is_some() {
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return; // The AArch64 backend doesn't support line debuginfo yet.
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}
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let end = self.create_debug_lines(context, isa, source_info_set);
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self.debug_context
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@ -329,6 +325,10 @@ impl<'a, 'tcx> FunctionDebugContext<'a, 'tcx> {
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length: u64::from(end),
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});
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if isa.get_mach_backend().is_some() {
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return; // Not yet implemented for the AArch64 backend.
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}
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let func_entry = self.debug_context.dwarf.unit.get_mut(self.entry_id);
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// Gdb requires both DW_AT_low_pc and DW_AT_high_pc. Otherwise the DW_TAG_subprogram is skipped.
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func_entry.set(gimli::DW_AT_low_pc, AttributeValue::Address(Address::Symbol {
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