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dwarf: add debug info for error unions

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This commit is contained in:
Jakub Konka 2022-03-25 15:50:42 +01:00
parent a1040a105a
commit 4985abcc49
2 changed files with 54 additions and 1 deletions
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1
src/codegen.zig
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@ -694,7 +694,6 @@ pub fn generateSymbol(
return Result{ .appended = {} };
},
.ErrorUnion => {
// TODO generate debug info for error unions
const error_ty = typed_value.ty.errorUnionSet();
const payload_ty = typed_value.ty.errorUnionPayload();
const is_payload = typed_value.val.errorUnionIsPayload();

54
src/link/Dwarf.zig
View File

@ -1107,6 +1107,16 @@ fn addDbgInfoType(
const name = try ty.nameAllocArena(arena, target);
try dbg_info_buffer.writer().print("{s}\x00", .{name});
// DW.AT.enumerator
const no_error = "(no error)";
try dbg_info_buffer.ensureUnusedCapacity(no_error.len + 2 + @sizeOf(u64));
dbg_info_buffer.appendAssumeCapacity(abbrev_enum_variant);
// DW.AT.name, DW.FORM.string
dbg_info_buffer.appendSliceAssumeCapacity(no_error);
dbg_info_buffer.appendAssumeCapacity(0);
// DW.AT.const_value, DW.FORM.data8
mem.writeInt(u64, dbg_info_buffer.addManyAsArrayAssumeCapacity(8), 0, target_endian);
const error_names = if (ty.isAnyError()) module.error_name_list.items else ty.errorSetNames();
for (error_names) |error_name| {
const kv = module.getErrorValue(error_name) catch unreachable;
@ -1123,6 +1133,50 @@ fn addDbgInfoType(
// DW.AT.enumeration_type delimit children
try dbg_info_buffer.append(0);
},
.ErrorUnion => {
const error_ty = ty.errorUnionSet();
const payload_ty = ty.errorUnionPayload();
const abi_size = ty.abiSize(target);
const abi_align = ty.abiAlignment(target);
const payload_off = mem.alignForwardGeneric(u64, error_ty.abiSize(target), abi_align);
// DW.AT.structure_type
try dbg_info_buffer.append(abbrev_struct_type);
// DW.AT.byte_size, DW.FORM.sdata
try leb128.writeULEB128(dbg_info_buffer.writer(), abi_size);
// DW.AT.name, DW.FORM.string
const name = try ty.nameAllocArena(arena, target);
try dbg_info_buffer.writer().print("{s}\x00", .{name});
// DW.AT.member
try dbg_info_buffer.ensureUnusedCapacity(7);
dbg_info_buffer.appendAssumeCapacity(abbrev_struct_member);
// DW.AT.name, DW.FORM.string
dbg_info_buffer.appendSliceAssumeCapacity("value");
dbg_info_buffer.appendAssumeCapacity(0);
// DW.AT.type, DW.FORM.ref4
var index = dbg_info_buffer.items.len;
try dbg_info_buffer.resize(index + 4);
try relocs.append(.{ .ty = payload_ty, .reloc = @intCast(u32, index) });
// DW.AT.data_member_location, DW.FORM.sdata
try leb128.writeULEB128(dbg_info_buffer.writer(), payload_off);
// DW.AT.member
try dbg_info_buffer.ensureUnusedCapacity(5);
dbg_info_buffer.appendAssumeCapacity(abbrev_struct_member);
// DW.AT.name, DW.FORM.string
dbg_info_buffer.appendSliceAssumeCapacity("err");
dbg_info_buffer.appendAssumeCapacity(0);
// DW.AT.type, DW.FORM.ref4
index = dbg_info_buffer.items.len;
try dbg_info_buffer.resize(index + 4);
try relocs.append(.{ .ty = error_ty, .reloc = @intCast(u32, index) });
// DW.AT.data_member_location, DW.FORM.sdata
try dbg_info_buffer.append(0);
// DW.AT.structure_type delimit children
try dbg_info_buffer.append(0);
},
else => {
log.debug("TODO implement .debug_info for type '{}'", .{ty.fmtDebug()});
try dbg_info_buffer.append(abbrev_pad1);