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dwarf: lower enums

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Jakub Konka 2022-03-22 21:27:10 +01:00 committed by Andrew Kelley
parent 8f9c3fd3df
commit 47f1a43bb7
2 changed files with 67 additions and 3 deletions
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1
src/codegen.zig
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@ -479,7 +479,6 @@ pub fn generateSymbol(
return Result{ .appended = {} };
},
.Enum => {
// TODO populate .debug_info for the enum
var int_buffer: Value.Payload.U64 = undefined;
const int_val = typed_value.enumToInt(&int_buffer);

69
src/link/Dwarf.zig
View File

@ -81,8 +81,10 @@ pub const abbrev_base_type = 4;
pub const abbrev_ptr_type = 5;
pub const abbrev_struct_type = 6;
pub const abbrev_struct_member = 7;
pub const abbrev_pad1 = 8;
pub const abbrev_parameter = 9;
pub const abbrev_enum_type = 8;
pub const abbrev_enum_variant = 9;
pub const abbrev_pad1 = 10;
pub const abbrev_parameter = 11;
/// The reloc offset for the virtual address of a function in its Line Number Program.
/// Size is a virtual address integer.
@ -879,6 +881,11 @@ fn addDbgInfoType(
}
},
.Struct => blk: {
if (ty.tag() == .tuple) {
log.debug("TODO implement .debug_info for type '{}'", .{ty.fmtDebug()});
try dbg_info_buffer.append(abbrev_pad1);
break :blk;
}
// try dbg_info_buffer.ensureUnusedCapacity(23);
// DW.AT.structure_type
try dbg_info_buffer.append(abbrev_struct_type);
@ -918,6 +925,46 @@ fn addDbgInfoType(
// DW.AT.structure_type delimit children
try dbg_info_buffer.append(0);
},
.Enum => {
// DW.AT.enumeration_type
try dbg_info_buffer.append(abbrev_enum_type);
// DW.AT.byte_size, DW.FORM.sdata
const abi_size = ty.abiSize(target);
try leb128.writeULEB128(dbg_info_buffer.writer(), abi_size);
// DW.AT.name, DW.FORM.string
const enum_name = try ty.nameAllocArena(arena, target);
try dbg_info_buffer.ensureUnusedCapacity(enum_name.len + 1);
dbg_info_buffer.appendSliceAssumeCapacity(enum_name);
dbg_info_buffer.appendAssumeCapacity(0);
const fields = ty.enumFields();
const values: ?Module.EnumFull.ValueMap = switch (ty.tag()) {
.enum_full, .enum_nonexhaustive => ty.cast(Type.Payload.EnumFull).?.data.values,
.enum_simple => null,
.enum_numbered => ty.castTag(.enum_numbered).?.data.values,
else => unreachable,
};
const target_endian = self.target.cpu.arch.endian();
for (fields.keys()) |field_name, field_i| {
// DW.AT.enumerator
try dbg_info_buffer.ensureUnusedCapacity(field_name.len + 2 + @sizeOf(u64));
dbg_info_buffer.appendAssumeCapacity(abbrev_enum_variant);
// DW.AT.name, DW.FORM.string
dbg_info_buffer.appendSliceAssumeCapacity(field_name);
dbg_info_buffer.appendAssumeCapacity(0);
// DW.AT.const_value, DW.FORM.data8
const value: u64 = if (values) |vals| value: {
if (vals.count() == 0) break :value @intCast(u64, field_i); // auto-numbered
const value = vals.keys()[field_i];
var int_buffer: Value.Payload.U64 = undefined;
break :value value.enumToInt(ty, &int_buffer).toUnsignedInt(target);
} else @intCast(u64, field_i);
mem.writeInt(u64, dbg_info_buffer.addManyAsArrayAssumeCapacity(8), value, target_endian);
}
// DW.AT.enumeration_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);
@ -1006,6 +1053,24 @@ pub fn writeDbgAbbrev(self: *Dwarf, file: *File) !void {
DW.FORM.sdata,
0,
0, // table sentinel
abbrev_enum_type,
DW.TAG.enumeration_type,
DW.CHILDREN.yes, // header
DW.AT.byte_size,
DW.FORM.sdata,
DW.AT.name,
DW.FORM.string,
0,
0, // table sentinel
abbrev_enum_variant,
DW.TAG.enumerator,
DW.CHILDREN.no, // header
DW.AT.name,
DW.FORM.string,
DW.AT.const_value,
DW.FORM.data8,
0,
0, // table sentinel
abbrev_pad1,
DW.TAG.unspecified_type,
DW.CHILDREN.no, // header