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Initial support for return forms (#6556)

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The main changes here are:
- Introducing `InitForm` and `RefForm` to represent initializing and
reference forms (the two return forms currently supported by the
parser).
- Introducing the `FormType` singleton inst to represent their type
(i.e. `Core.Form`).
- Emitting an inst representing a function's declared return form as
part of handling the function signature.

The return form inst is currently ignored. Subsequent PRs will expose it
in `SemIR::Function` and use it to determine the form of call
expressions.
This commit is contained in:
Geoff Romer
2026-01-07 00:54:18 +00:00
committed by GitHub
parent 444c18dfa3
commit 505b1c86b9
225 changed files with 4164 additions and 2583 deletions
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toolchain/check/testdata/pointer/nested_const.carbon
Vendored
+3 -1
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@@ -31,6 +31,7 @@ fn F(p: const (const (const i32*)*)) -> const i32 {
// CHECK:STDOUT: %ptr.6e8: type = ptr_type %const.58f [concrete]
// CHECK:STDOUT: %const.fa2: type = const_type %ptr.6e8 [concrete]
// CHECK:STDOUT: %pattern_type.800: type = pattern_type %const.fa2 [concrete]
// CHECK:STDOUT: %.d3c: form = init_form %const.20a, call_param1 [concrete]
// CHECK:STDOUT: %pattern_type.a65: type = pattern_type %const.20a [concrete]
// CHECK:STDOUT: %F.type: type = fn_type @F [concrete]
// CHECK:STDOUT: %F: %F.type = struct_value () [concrete]
@@ -81,8 +82,9 @@ fn F(p: const (const (const i32*)*)) -> const i32 {
// CHECK:STDOUT: %int_32.loc16_47: Core.IntLiteral = int_value 32 [concrete = constants.%int_32]
// CHECK:STDOUT: %i32.loc16_47: type = class_type @Int, @Int(constants.%int_32) [concrete = constants.%i32]
// CHECK:STDOUT: %const.loc16_41: type = const_type %i32.loc16_47 [concrete = constants.%const.20a]
// CHECK:STDOUT: %.loc16_41: form = init_form %const.loc16_41, call_param1 [concrete = constants.%.d3c]
// CHECK:STDOUT: %p.param: %const.fa2 = value_param call_param0
// CHECK:STDOUT: %.loc16: type = splice_block %const.loc16_9 [concrete = constants.%const.fa2] {
// CHECK:STDOUT: %.loc16_9: type = splice_block %const.loc16_9 [concrete = constants.%const.fa2] {
// CHECK:STDOUT: %int_32.loc16_29: Core.IntLiteral = int_value 32 [concrete = constants.%int_32]
// CHECK:STDOUT: %i32.loc16_29: type = class_type @Int, @Int(constants.%int_32) [concrete = constants.%i32]
// CHECK:STDOUT: %const.loc16_23: type = const_type %i32.loc16_29 [concrete = constants.%const.20a]