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carbon-lang/toolchain/check/testdata/function/definition/implicit_import.carbon
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Jon Ross-Perkins 2361830592 Special-case api/impl implicit imports and verify relevant redeclarations. (#3843) 
Adds ImportIRId::ApiForImpl to reserve a specific slot for the `api`
import, so that the code can trivially determine whether an import is
from the same library. This is then used for merging function
declarations, because the rules for redeclarations in the same library
slightly differ as compared to other imports (note they're also not
identical to same-file rules).

The main thing this leaves from the recent #3762 is verifying that
entities forward declared in the `impl` file are also defined, but
that's not in-scope for merging; it's moreso post-checking validation.

Note, a lot of our `invalid <entity> ID` comments in ids.h were
incorrectly copy-pasted, so I've cut `<entity>`.
2024-04-04 16:03:41 +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
// --- basic.carbon
library "basic" api;
fn A();
// --- basic.impl.carbon
library "basic" impl;
fn A() {}
// --- extern_api.carbon
library "extern_api" api;
extern fn A();
// --- fail_extern_api.impl.carbon
library "extern_api" impl;
// CHECK:STDERR: fail_extern_api.impl.carbon:[[@LINE+10]]:1: ERROR: Redeclarations in the same library must match use of `extern`.
// CHECK:STDERR: fn A() {}
// CHECK:STDERR: ^~~~~~~~
// CHECK:STDERR: fail_extern_api.impl.carbon:[[@LINE-5]]:1: In import.
// CHECK:STDERR: library "extern_api" impl;
// CHECK:STDERR: ^~~~~~~
// CHECK:STDERR: extern_api.carbon:4:1: Previously declared here.
// CHECK:STDERR: extern fn A();
// CHECK:STDERR: ^~~~~~~~~~~~~~
// CHECK:STDERR:
fn A() {}
// --- extern_impl.carbon
library "extern_impl" api;
fn A();
// --- fail_extern_impl.impl.carbon
library "extern_impl" impl;
// CHECK:STDERR: fail_extern_impl.impl.carbon:[[@LINE+4]]:1: ERROR: `extern` not allowed on `fn` declaration that provides a definition.
// CHECK:STDERR: extern fn A() {}
// CHECK:STDERR: ^~~~~~
// CHECK:STDERR:
extern fn A() {}
// --- redecl_after_def.carbon
library "redecl_after_def" api;
fn A() {}
// --- fail_redecl_after_def.impl.carbon
library "redecl_after_def" impl;
// CHECK:STDERR: fail_redecl_after_def.impl.carbon:[[@LINE+10]]:1: ERROR: Redundant redeclaration of function A.
// CHECK:STDERR: fn A();
// CHECK:STDERR: ^~~~~~~
// CHECK:STDERR: fail_redecl_after_def.impl.carbon:[[@LINE-5]]:1: In import.
// CHECK:STDERR: library "redecl_after_def" impl;
// CHECK:STDERR: ^~~~~~~
// CHECK:STDERR: redecl_after_def.carbon:4:1: Previously declared here.
// CHECK:STDERR: fn A() {}
// CHECK:STDERR: ^~~~~~~~
// CHECK:STDERR:
fn A();
// --- redef_after_def.carbon
library "redef_after_def" api;
fn A() {}
// --- fail_redef_after_def.impl.carbon
library "redef_after_def" impl;
// CHECK:STDERR: fail_redef_after_def.impl.carbon:[[@LINE+9]]:1: ERROR: Redefinition of function A.
// CHECK:STDERR: fn A() {}
// CHECK:STDERR: ^~~~~~~~
// CHECK:STDERR: fail_redef_after_def.impl.carbon:[[@LINE-5]]:1: In import.
// CHECK:STDERR: library "redef_after_def" impl;
// CHECK:STDERR: ^~~~~~~
// CHECK:STDERR: redef_after_def.carbon:4:1: Previously defined here.
// CHECK:STDERR: fn A() {}
// CHECK:STDERR: ^~~~~~~~
fn A() {}
// CHECK:STDOUT: --- basic.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: package: <namespace> = namespace [template] {
// CHECK:STDOUT: .A = %A
// CHECK:STDOUT: }
// CHECK:STDOUT: %A: <function> = fn_decl @A [template] {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @A();
// CHECK:STDOUT:
// CHECK:STDOUT: --- basic.impl.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: package: <namespace> = namespace [template] {
// CHECK:STDOUT: .A = %A
// CHECK:STDOUT: }
// CHECK:STDOUT: %import_ref: <function> = import_ref ir1, inst+1, loaded [template = imports.%A]
// CHECK:STDOUT: %A: <function> = fn_decl @A [template] {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @A() {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: return
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: --- extern_api.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: package: <namespace> = namespace [template] {
// CHECK:STDOUT: .A = %A
// CHECK:STDOUT: }
// CHECK:STDOUT: %A: <function> = fn_decl @A [template] {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: extern fn @A();
// CHECK:STDOUT:
// CHECK:STDOUT: --- fail_extern_api.impl.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: package: <namespace> = namespace [template] {
// CHECK:STDOUT: .A = %A
// CHECK:STDOUT: }
// CHECK:STDOUT: %import_ref: <function> = import_ref ir1, inst+1, loaded [template = imports.%A]
// CHECK:STDOUT: %A: <function> = fn_decl @A [template] {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @A() {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: return
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: --- extern_impl.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: package: <namespace> = namespace [template] {
// CHECK:STDOUT: .A = %A
// CHECK:STDOUT: }
// CHECK:STDOUT: %A: <function> = fn_decl @A [template] {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @A();
// CHECK:STDOUT:
// CHECK:STDOUT: --- fail_extern_impl.impl.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: package: <namespace> = namespace [template] {
// CHECK:STDOUT: .A = %A
// CHECK:STDOUT: }
// CHECK:STDOUT: %import_ref: <function> = import_ref ir1, inst+1, loaded [template = imports.%A]
// CHECK:STDOUT: %A: <function> = fn_decl @A [template] {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @A() {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: return
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: --- redecl_after_def.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: package: <namespace> = namespace [template] {
// CHECK:STDOUT: .A = %A
// CHECK:STDOUT: }
// CHECK:STDOUT: %A: <function> = fn_decl @A [template] {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @A() {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: return
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: --- fail_redecl_after_def.impl.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: package: <namespace> = namespace [template] {
// CHECK:STDOUT: .A = %A
// CHECK:STDOUT: }
// CHECK:STDOUT: %import_ref: <function> = import_ref ir1, inst+1, loaded [template = imports.%A]
// CHECK:STDOUT: %A: <function> = fn_decl @A [template] {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @A();
// CHECK:STDOUT:
// CHECK:STDOUT: --- redef_after_def.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: package: <namespace> = namespace [template] {
// CHECK:STDOUT: .A = %A
// CHECK:STDOUT: }
// CHECK:STDOUT: %A: <function> = fn_decl @A [template] {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @A() {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: return
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: --- fail_redef_after_def.impl.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: package: <namespace> = namespace [template] {
// CHECK:STDOUT: .A = %A
// CHECK:STDOUT: }
// CHECK:STDOUT: %import_ref: <function> = import_ref ir1, inst+1, loaded [template = imports.%A]
// CHECK:STDOUT: %A: <function> = fn_decl @A [template] {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @A() {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: return
// CHECK:STDOUT: }
// CHECK:STDOUT:
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