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InternPool: implement only_possible_value prong of indexToKey

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for the new struct and packed struct encodings.
This commit is contained in:
Andrew Kelley 2023-09-19 19:16:17 -07:00
parent b65f3d8826
commit 483b3a3344
1 changed files with 24 additions and 16 deletions
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40
src/InternPool.zig
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@ -3859,7 +3859,7 @@ pub fn indexToKey(ip: *const InternPool, index: Index) Key {
.func_decl => .{ .func = ip.extraFuncDecl(data) },
.func_coerced => .{ .func = ip.extraFuncCoerced(data) },
.only_possible_value => {
const ty = @as(Index, @enumFromInt(data));
const ty: Index = @enumFromInt(data);
const ty_item = ip.items.get(@intFromEnum(ty));
return switch (ty_item.tag) {
.type_array_big => {
@ -3872,20 +3872,33 @@ pub fn indexToKey(ip: *const InternPool, index: Index) Key {
.storage = .{ .elems = sentinel[0..@intFromBool(sentinel[0] != .none)] },
} };
},
.type_array_small, .type_vector => .{ .aggregate = .{
.ty = ty,
.storage = .{ .elems = &.{} },
} },
// TODO: migrate structs to properly use the InternPool rather
// than using the SegmentedList trick, then the struct type will
// have a slice of comptime values that can be used here for when
// the struct has one possible value due to all fields comptime (same
// as the tuple case below).
.type_struct, .type_struct_ns => .{ .aggregate = .{
.type_array_small,
.type_vector,
.type_struct_ns,
.type_struct_packed,
=> .{ .aggregate = .{
.ty = ty,
.storage = .{ .elems = &.{} },
} },
// There is only one possible value precisely due to the
// fact that this values slice is fully populated!
.type_struct => {
const info = extraStructType(ip, ty_item.data);
return .{ .aggregate = .{
.ty = ty,
.storage = .{ .elems = @ptrCast(info.field_inits.get(ip)) },
} };
},
.type_struct_packed_inits => {
const info = extraPackedStructType(ip, ty_item.data, true);
return .{ .aggregate = .{
.ty = ty,
.storage = .{ .elems = @ptrCast(info.field_inits.get(ip)) },
} };
},
// There is only one possible value precisely due to the
// fact that this values slice is fully populated!
.type_struct_anon, .type_tuple_anon => {
@ -3898,11 +3911,6 @@ pub fn indexToKey(ip: *const InternPool, index: Index) Key {
} };
},
.type_struct_packed, .type_struct_packed_inits => {
// a packed struct has a 0-bit backing type
@panic("TODO");
},
.type_enum_auto,
.type_enum_explicit,
.type_union,