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elf: generated DWARF debug info for named structs

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This commit is contained in:
Jakub Konka 2022-02-03 16:32:39 +01:00
parent cfceec15e1
commit 228b798af5
1 changed files with 54 additions and 4 deletions
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58
src/link/Elf.zig
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@ -855,10 +855,11 @@ pub const abbrev_subprogram = 2;
pub const abbrev_subprogram_retvoid = 3;
pub const abbrev_base_type = 4;
pub const abbrev_ptr_type = 5;
pub const abbrev_anon_struct_type = 6;
pub const abbrev_struct_member = 7;
pub const abbrev_pad1 = 8;
pub const abbrev_parameter = 9;
pub const abbrev_struct_type = 6;
pub const abbrev_anon_struct_type = 7;
pub const abbrev_struct_member = 8;
pub const abbrev_pad1 = 9;
pub const abbrev_parameter = 10;
pub fn flush(self: *Elf, comp: *Compilation) !void {
if (self.base.options.emit == null) {
@ -955,6 +956,15 @@ pub fn flushModule(self: *Elf, comp: *Compilation) !void {
DW.FORM.ref4,
0,
0, // table sentinel
abbrev_struct_type,
DW.TAG.structure_type,
DW.CHILDREN.yes, // header
DW.AT.byte_size,
DW.FORM.sdata,
DW.AT.name,
DW.FORM.string,
0,
0, // table sentinel
abbrev_anon_struct_type,
DW.TAG.structure_type,
DW.CHILDREN.yes, // header
@ -2968,6 +2978,46 @@ fn addDbgInfoType(
try relocs.append(.{ .ty = ty.childType(), .reloc = @intCast(u32, index) });
}
},
.Struct => blk: {
// try dbg_info_buffer.ensureUnusedCapacity(23);
// DW.AT.structure_type
try dbg_info_buffer.append(abbrev_struct_type);
// DW.AT.byte_size, DW.FORM.sdata
const abi_size = ty.abiSize(self.base.options.target);
try leb128.writeULEB128(dbg_info_buffer.writer(), abi_size);
// DW.AT.name, DW.FORM.string
const struct_name = try ty.nameAlloc(arena);
try dbg_info_buffer.ensureUnusedCapacity(struct_name.len + 1);
dbg_info_buffer.appendSliceAssumeCapacity(struct_name);
dbg_info_buffer.appendAssumeCapacity(0);
const struct_obj = ty.castTag(.@"struct").?.data;
if (struct_obj.layout == .Packed) {
log.debug("TODO implement .debug_info for packed structs", .{});
break :blk;
}
const fields = ty.structFields();
for (fields.keys()) |field_name, field_index| {
const field = fields.get(field_name).?;
// DW.AT.member
try dbg_info_buffer.ensureUnusedCapacity(field_name.len + 2);
dbg_info_buffer.appendAssumeCapacity(abbrev_struct_member);
// DW.AT.name, DW.FORM.string
dbg_info_buffer.appendSliceAssumeCapacity(field_name);
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 = field.ty, .reloc = @intCast(u32, index) });
// DW.AT.data_member_location, DW.FORM.sdata
const field_off = ty.structFieldOffset(field_index, self.base.options.target);
try leb128.writeULEB128(dbg_info_buffer.writer(), field_off);
}
// DW.AT.structure_type delimit children
try dbg_info_buffer.append(0);
},
else => {
log.debug("TODO implement .debug_info for type '{}'", .{ty});
try dbg_info_buffer.append(abbrev_pad1);