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Promote FunctionType to a standard instruction. (#3931)

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This removes the builtin FunctionType, replacing it with a FunctionType
instruction. The constant for a FunctionDecl is now a StructValue with
type of FunctionType.

Note this means a function declaration produces _both_ a type, and a
value of the type. This has some consequences in terms of circularity,
and makes the importing of function declarations a little more complex.

It'll get particularly peculiar for imports because of the behavior of
the reference, but that's a known issue due to other things such as
`alias`. The impact will hopefully be contained to
ResolvePrevInstForMerge (and ImportRefs).

To note a small formatting change in diagnostics:

```
-  // CHECK:STDERR: fail_member_lookup.carbon:[[@LINE+4]]:3: ERROR: Value of type `<associated <function> in Interface>` is not callable.
+  // CHECK:STDERR: fail_member_lookup.carbon:[[@LINE+4]]:3: ERROR: Value of type `<associated F in Interface>` is not callable.

-  // CHECK:STDERR: fail_todo_facet_lookup.carbon:[[@LINE+4]]:3: ERROR: Value of type `<associated <function> in Interface>` is not callable.
+  // CHECK:STDERR: fail_todo_facet_lookup.carbon:[[@LINE+4]]:3: ERROR: Value of type `<associated F in Interface>` is not callable.
```

---------

Co-authored-by: Richard Smith <richard@metafoo.co.uk>
This commit is contained in:
Jon Ross-Perkins
2024-05-03 15:18:04 +00:00
committed by GitHub
co-authored by Richard Smith
parent e6061f6910
commit 76ed3c73cb
405 changed files with 9799 additions and 6579 deletions
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toolchain/check/testdata/pointer/nested_const.carbon
Vendored
+5 -2
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@@ -17,15 +17,18 @@ fn F(p: const (const (const i32*)*)) -> const i32 {
// CHECK:STDOUT: %.3: type = const_type const i32* [template]
// CHECK:STDOUT: %.4: type = ptr_type const (const i32*) [template]
// CHECK:STDOUT: %.5: type = const_type const (const i32*)* [template]
// CHECK:STDOUT: %F: type = fn_type @F [template]
// CHECK:STDOUT: %.6: type = tuple_type () [template]
// CHECK:STDOUT: %struct: F = struct_value () [template]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: package: <namespace> = namespace [template] {
// CHECK:STDOUT: .Core = %Core
// CHECK:STDOUT: .F = %F
// CHECK:STDOUT: .F = %F.decl
// CHECK:STDOUT: }
// CHECK:STDOUT: %Core: <namespace> = namespace [template] {}
// CHECK:STDOUT: %F: <function> = fn_decl @F [template] {
// CHECK:STDOUT: %F.decl: F = fn_decl @F [template = constants.%struct] {
// CHECK:STDOUT: %.loc8_23: type = const_type i32 [template = constants.%.1]
// CHECK:STDOUT: %.loc8_32: type = ptr_type const i32 [template = constants.%.2]
// CHECK:STDOUT: %.loc8_16: type = const_type const i32* [template = constants.%.3]