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carbon-lang/toolchain/check/testdata/class/import.carbon
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Richard SmithandJon Ross-Perkins d8be774b8b Lowering support for overloaded operators. (#3798) 
Fix a collection of issues that were preventing lowering for overloaded
operators from working.

Instead of creating `import_ref` instructions during name lookup in the
current block, whatever that might be, we now create them in the `file`
block always. This avoids inserting them into blocks that might not be
intended to contain them, such as functions, and avoids the IR generated
for a function depending on which names we happen to have looked up
first.

When importing a class, function, or interface, import its enclosing
scope ID. This is necessary to allow us to distinguish between functions
at interface scope, which shouldn't be lowered, and other functions, and
will also be used in future to provide qualified names for declarations
when printing types. In order to support this:

- Track the constant values of namespaces created during importing so
that we can find them when resolving an import ref. Use those constant
values to convert an enclosing scope ID from the imported IR into a
corresponding ID in the current IR.
- Change how we do two-pass import of classes and namespaces so that we
can do two-pass import even for non-defining declarations, so that we
can import the enclosing scope.

While working on the final point above, I reworked `TryResolveInst` to
return a flag indicating whether another pass is necessary instead of
implicitly encoding this in the `ConstantId`. This permits the handling
of classes to be simplified; now `import_ir_constant_values` is only
accessed in a single place.

---------

Co-authored-by: Jon Ross-Perkins <jperkins@google.com>
2024-03-20 23:32:44 +00:00

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// Part of the Carbon Language project, under the Apache License v2.0 with LLVM
// Exceptions. See /LICENSE for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
// AUTOUPDATE
// --- a.carbon
library "a" api;
class Empty {
}
class Field {
var x: i32;
}
class ForwardDeclared;
class ForwardDeclared {
fn F[self: Self]();
fn G[addr self: Self*]();
}
class Incomplete;
// --- b.carbon
library "b" api;
import library "a";
fn Run() {
var a: Empty = {};
var b: Field = {.x = 1};
b.x = 2;
var c: ForwardDeclared = {};
c.F();
c.G();
var d: ForwardDeclared* = &c;
var e: Incomplete*;
}
// CHECK:STDOUT: --- a.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %Empty: type = class_type @Empty [template]
// CHECK:STDOUT: %.1: type = struct_type {} [template]
// CHECK:STDOUT: %Field: type = class_type @Field [template]
// CHECK:STDOUT: %.2: type = unbound_element_type Field, i32 [template]
// CHECK:STDOUT: %.3: type = struct_type {.x: i32} [template]
// CHECK:STDOUT: %ForwardDeclared: type = class_type @ForwardDeclared [template]
// CHECK:STDOUT: %.4: type = ptr_type ForwardDeclared [template]
// CHECK:STDOUT: %Incomplete: type = class_type @Incomplete [template]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: package: <namespace> = namespace [template] {
// CHECK:STDOUT: .Empty = %Empty.decl
// CHECK:STDOUT: .Field = %Field.decl
// CHECK:STDOUT: .ForwardDeclared = %ForwardDeclared.decl.loc11
// CHECK:STDOUT: .Incomplete = %Incomplete.decl
// CHECK:STDOUT: }
// CHECK:STDOUT: %Empty.decl: type = class_decl @Empty [template = constants.%Empty] {}
// CHECK:STDOUT: %Field.decl: type = class_decl @Field [template = constants.%Field] {}
// CHECK:STDOUT: %ForwardDeclared.decl.loc11: type = class_decl @ForwardDeclared [template = constants.%ForwardDeclared] {}
// CHECK:STDOUT: %ForwardDeclared.decl.loc13: type = class_decl @ForwardDeclared [template = constants.%ForwardDeclared] {}
// CHECK:STDOUT: %Incomplete.decl: type = class_decl @Incomplete [template = constants.%Incomplete] {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: class @Empty {
// CHECK:STDOUT: !members:
// CHECK:STDOUT: .Self = constants.%Empty
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: class @Field {
// CHECK:STDOUT: %.loc8: <unbound element of class Field> = field_decl x, element0 [template]
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT: .Self = constants.%Field
// CHECK:STDOUT: .x = %.loc8
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: class @ForwardDeclared {
// CHECK:STDOUT: %F: <function> = fn_decl @F [template] {
// CHECK:STDOUT: %Self.ref.loc14: type = name_ref Self, constants.%ForwardDeclared [template = constants.%ForwardDeclared]
// CHECK:STDOUT: %self.loc14_8.1: ForwardDeclared = param self
// CHECK:STDOUT: %self.loc14_8.2: ForwardDeclared = bind_name self, %self.loc14_8.1
// CHECK:STDOUT: }
// CHECK:STDOUT: %G: <function> = fn_decl @G [template] {
// CHECK:STDOUT: %Self.ref.loc15: type = name_ref Self, constants.%ForwardDeclared [template = constants.%ForwardDeclared]
// CHECK:STDOUT: %.loc15_23: type = ptr_type ForwardDeclared [template = constants.%.4]
// CHECK:STDOUT: %self.loc15_13.1: ForwardDeclared* = param self
// CHECK:STDOUT: %self.loc15_13.3: ForwardDeclared* = bind_name self, %self.loc15_13.1
// CHECK:STDOUT: %.loc15_8: ForwardDeclared* = addr_pattern %self.loc15_13.3
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT: .Self = constants.%ForwardDeclared
// CHECK:STDOUT: .F = %F
// CHECK:STDOUT: .G = %G
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: class @Incomplete;
// CHECK:STDOUT:
// CHECK:STDOUT: fn @F[@ForwardDeclared.%self.loc14_8.2: ForwardDeclared]();
// CHECK:STDOUT:
// CHECK:STDOUT: fn @G[addr @ForwardDeclared.%self.loc15_13.3: ForwardDeclared*]();
// CHECK:STDOUT:
// CHECK:STDOUT: --- b.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %Empty: type = class_type @Empty [template]
// CHECK:STDOUT: %.1: type = struct_type {} [template]
// CHECK:STDOUT: %.2: type = tuple_type () [template]
// CHECK:STDOUT: %.3: type = ptr_type {} [template]
// CHECK:STDOUT: %.4: Empty = struct_value () [template]
// CHECK:STDOUT: %Field: type = class_type @Field [template]
// CHECK:STDOUT: %.5: type = struct_type {.x: i32} [template]
// CHECK:STDOUT: %.6: type = ptr_type {.x: i32} [template]
// CHECK:STDOUT: %.7: i32 = int_literal 1 [template]
// CHECK:STDOUT: %.8: Field = struct_value (%.7) [template]
// CHECK:STDOUT: %.9: type = unbound_element_type Field, i32 [template]
// CHECK:STDOUT: %.10: i32 = int_literal 2 [template]
// CHECK:STDOUT: %ForwardDeclared.1: type = class_type @ForwardDeclared.1 [template]
// CHECK:STDOUT: %.11: ForwardDeclared = struct_value () [template]
// CHECK:STDOUT: %ForwardDeclared.2: type = class_type @ForwardDeclared.2 [template]
// CHECK:STDOUT: %.12: type = ptr_type ForwardDeclared [template]
// CHECK:STDOUT: %Incomplete: type = class_type @Incomplete [template]
// CHECK:STDOUT: %.13: type = ptr_type Incomplete [template]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: package: <namespace> = namespace [template] {
// CHECK:STDOUT: .Empty = %import_ref.1
// CHECK:STDOUT: .Field = %import_ref.2
// CHECK:STDOUT: .ForwardDeclared = %import_ref.3
// CHECK:STDOUT: .Incomplete = %import_ref.4
// CHECK:STDOUT: .Run = %Run
// CHECK:STDOUT: }
// CHECK:STDOUT: %import_ref.1: type = import_ref ir1, inst+1, used [template = constants.%Empty]
// CHECK:STDOUT: %import_ref.2: type = import_ref ir1, inst+4, used [template = constants.%Field]
// CHECK:STDOUT: %import_ref.3: type = import_ref ir1, inst+11, used [template = constants.%ForwardDeclared.1]
// CHECK:STDOUT: %import_ref.4: type = import_ref ir1, inst+25, used [template = constants.%Incomplete]
// CHECK:STDOUT: %Run: <function> = fn_decl @Run [template] {}
// CHECK:STDOUT: %import_ref.5 = import_ref ir1, inst+2, unused
// CHECK:STDOUT: %import_ref.6 = import_ref ir1, inst+5, unused
// CHECK:STDOUT: %import_ref.7: <unbound element of class Field> = import_ref ir1, inst+7, used [template = imports.%.1]
// CHECK:STDOUT: %import_ref.8 = import_ref ir1, inst+12, unused
// CHECK:STDOUT: %import_ref.9: <function> = import_ref ir1, inst+24, used [template = imports.%G]
// CHECK:STDOUT: %import_ref.10: <function> = import_ref ir1, inst+17, used [template = imports.%F]
// CHECK:STDOUT: %import_ref.11 = import_ref ir1, inst+12, unused
// CHECK:STDOUT: %import_ref.12 = import_ref ir1, inst+24, unused
// CHECK:STDOUT: %import_ref.13 = import_ref ir1, inst+17, unused
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: class @Empty {
// CHECK:STDOUT: !members:
// CHECK:STDOUT: .Self = file.%import_ref.5
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: class @Field {
// CHECK:STDOUT: !members:
// CHECK:STDOUT: .Self = file.%import_ref.6
// CHECK:STDOUT: .x = file.%import_ref.7
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: class @ForwardDeclared.1 {
// CHECK:STDOUT: !members:
// CHECK:STDOUT: .Self = file.%import_ref.8
// CHECK:STDOUT: .G = file.%import_ref.9
// CHECK:STDOUT: .F = file.%import_ref.10
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: class @ForwardDeclared.2 {
// CHECK:STDOUT: !members:
// CHECK:STDOUT: .Self = file.%import_ref.11
// CHECK:STDOUT: .G = file.%import_ref.12
// CHECK:STDOUT: .F = file.%import_ref.13
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: class @Incomplete;
// CHECK:STDOUT:
// CHECK:STDOUT: fn @Run() {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: %Empty.decl: invalid = class_decl @Empty [template = constants.%Empty] {}
// CHECK:STDOUT: %Empty.ref: type = name_ref Empty, file.%import_ref.1 [template = constants.%Empty]
// CHECK:STDOUT: %a.var: ref Empty = var a
// CHECK:STDOUT: %a: ref Empty = bind_name a, %a.var
// CHECK:STDOUT: %.loc7_19.1: {} = struct_literal ()
// CHECK:STDOUT: %.loc7_19.2: init Empty = class_init (), %a.var [template = constants.%.4]
// CHECK:STDOUT: %.loc7_19.3: init Empty = converted %.loc7_19.1, %.loc7_19.2 [template = constants.%.4]
// CHECK:STDOUT: assign %a.var, %.loc7_19.3
// CHECK:STDOUT: %Field.decl: invalid = class_decl @Field [template = constants.%Field] {}
// CHECK:STDOUT: %Field.ref: type = name_ref Field, file.%import_ref.2 [template = constants.%Field]
// CHECK:STDOUT: %b.var: ref Field = var b
// CHECK:STDOUT: %b: ref Field = bind_name b, %b.var
// CHECK:STDOUT: %.loc9_24: i32 = int_literal 1 [template = constants.%.7]
// CHECK:STDOUT: %.loc9_25.1: {.x: i32} = struct_literal (%.loc9_24)
// CHECK:STDOUT: %.loc9_25.2: ref i32 = class_element_access %b.var, element0
// CHECK:STDOUT: %.loc9_25.3: init i32 = initialize_from %.loc9_24 to %.loc9_25.2 [template = constants.%.7]
// CHECK:STDOUT: %.loc9_25.4: init Field = class_init (%.loc9_25.3), %b.var [template = constants.%.8]
// CHECK:STDOUT: %.loc9_25.5: init Field = converted %.loc9_25.1, %.loc9_25.4 [template = constants.%.8]
// CHECK:STDOUT: assign %b.var, %.loc9_25.5
// CHECK:STDOUT: %b.ref: ref Field = name_ref b, %b
// CHECK:STDOUT: %x.ref: <unbound element of class Field> = name_ref x, file.%import_ref.7 [template = imports.%.1]
// CHECK:STDOUT: %.loc10_4: ref i32 = class_element_access %b.ref, element0
// CHECK:STDOUT: %.loc10_9: i32 = int_literal 2 [template = constants.%.10]
// CHECK:STDOUT: assign %.loc10_4, %.loc10_9
// CHECK:STDOUT: %ForwardDeclared.decl.1: invalid = class_decl @ForwardDeclared.1 [template = constants.%ForwardDeclared.1] {}
// CHECK:STDOUT: %ForwardDeclared.ref.loc12: type = name_ref ForwardDeclared, file.%import_ref.3 [template = constants.%ForwardDeclared.1]
// CHECK:STDOUT: %c.var: ref ForwardDeclared = var c
// CHECK:STDOUT: %c: ref ForwardDeclared = bind_name c, %c.var
// CHECK:STDOUT: %.loc12_29.1: {} = struct_literal ()
// CHECK:STDOUT: %.loc12_29.2: init ForwardDeclared = class_init (), %c.var [template = constants.%.11]
// CHECK:STDOUT: %.loc12_29.3: init ForwardDeclared = converted %.loc12_29.1, %.loc12_29.2 [template = constants.%.11]
// CHECK:STDOUT: assign %c.var, %.loc12_29.3
// CHECK:STDOUT: %c.ref.loc13: ref ForwardDeclared = name_ref c, %c
// CHECK:STDOUT: %ForwardDeclared.decl.2: invalid = class_decl @ForwardDeclared.2 [template = constants.%ForwardDeclared.2] {}
// CHECK:STDOUT: %F.ref: <function> = name_ref F, file.%import_ref.10 [template = imports.%F]
// CHECK:STDOUT: %.loc13_4: <bound method> = bound_method %c.ref.loc13, %F.ref
// CHECK:STDOUT: %.loc13_3: ForwardDeclared = bind_value %c.ref.loc13
// CHECK:STDOUT: %.loc13_6: init () = call %.loc13_4(%.loc13_3)
// CHECK:STDOUT: %c.ref.loc14: ref ForwardDeclared = name_ref c, %c
// CHECK:STDOUT: %G.ref: <function> = name_ref G, file.%import_ref.9 [template = imports.%G]
// CHECK:STDOUT: %.loc14_4: <bound method> = bound_method %c.ref.loc14, %G.ref
// CHECK:STDOUT: %.loc14_3: ForwardDeclared* = addr_of %c.ref.loc14
// CHECK:STDOUT: %.loc14_6: init () = call %.loc14_4(%.loc14_3)
// CHECK:STDOUT: %ForwardDeclared.ref.loc16: type = name_ref ForwardDeclared, file.%import_ref.3 [template = constants.%ForwardDeclared.1]
// CHECK:STDOUT: %.loc16_25: type = ptr_type ForwardDeclared [template = constants.%.12]
// CHECK:STDOUT: %d.var: ref ForwardDeclared* = var d
// CHECK:STDOUT: %d: ref ForwardDeclared* = bind_name d, %d.var
// CHECK:STDOUT: %c.ref.loc16: ref ForwardDeclared = name_ref c, %c
// CHECK:STDOUT: %.loc16_29: ForwardDeclared* = addr_of %c.ref.loc16
// CHECK:STDOUT: assign %d.var, %.loc16_29
// CHECK:STDOUT: %Incomplete.decl: invalid = class_decl @Incomplete [template = constants.%Incomplete] {}
// CHECK:STDOUT: %Incomplete.ref: type = name_ref Incomplete, file.%import_ref.4 [template = constants.%Incomplete]
// CHECK:STDOUT: %.loc18: type = ptr_type Incomplete [template = constants.%.13]
// CHECK:STDOUT: %e.var: ref Incomplete* = var e
// CHECK:STDOUT: %e: ref Incomplete* = bind_name e, %e.var
// CHECK:STDOUT: return
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @F[%self: ForwardDeclared]();
// CHECK:STDOUT:
// CHECK:STDOUT: fn @G[addr %self: ForwardDeclared*]();
// CHECK:STDOUT:
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