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carbon-lang/toolchain/check/testdata/if_expr/fail_not_in_function.carbon
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David BlaikieandRichard Smith 12fa65e53c Check for use of InstIds from the wrong SemIR::File (#5997) 
Use the `CheckIRId` as a unique identifier for the scope of an `InstId`
- if an `InstId` is created within the scope of one `CheckIRId` it must
not be used in the scope of a different `CheckIRId`.

This is achieved without extra storage, but with false negatives for
large inputs.

When an `InstId` is created, the original index of the `Inst` is XORed
with a tag derived from the `CheckIRId` to produce the final `InstId`.
When the `InstId` is used, the expected tag is XORed with the `InstId`
to get back to the original index - if the tags don't match, the
resulting index will be corrupted, likely too large - resulting in an
out of bounds index CHECK-failure.

(the tag value is derived as such:
* take the CheckIRId
* left shift one bit (padding zero)
* left shift another bit (padding 1 - used to signify that the resulting
`InstId` has a tag combined into it)
* reverse the bits

In this way, the tag is unlikely to overlap with the index for small
test cases - making it possible to separate out the `CheckIRId` from the
index in these cases to provide more meaningful debugging/CHECK
messages, and more informative `SemIR` textual dumping that can now
include the `CheckIRId` along with the `Inst`'s index in the name of an
`inst`)

The test churn here is improved printing as tagged `InstId`s can now,
with best effort (more likely for small test cases where the `CheckIRId`
and the `Inst` index aren't at risk of overlapping from the high and low
bits), render the `CheckIRId` as part of the inst's name. Going from
`instNN` to `irMM.instNN`.

---------

Co-authored-by: Richard Smith <richard@metafoo.co.uk>
2025-10-02 23:07:36 +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
//
// INCLUDE-FILE: toolchain/testing/testdata/min_prelude/primitives.carbon
// TODO: Add ranges and switch to "--dump-sem-ir-ranges=only".
// EXTRA-ARGS: --dump-sem-ir-ranges=if-present
//
// AUTOUPDATE
// TIP: To test this file alone, run:
// TIP: bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/check/testdata/if_expr/fail_not_in_function.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/if_expr/fail_not_in_function.carbon
// --- fail_basic.carbon
library "[[@TEST_NAME]]";
// CHECK:STDERR: fail_basic.carbon:[[@LINE+12]]:14: error: semantics TODO: `Control flow expressions are currently only supported inside functions.` [SemanticsTodo]
// CHECK:STDERR: let x: i32 = if true then 1 else 0;
// CHECK:STDERR: ^~~~~~~
// CHECK:STDERR:
// CHECK:STDERR: fail_basic.carbon:[[@LINE+8]]:22: error: semantics TODO: `Control flow expressions are currently only supported inside functions.` [SemanticsTodo]
// CHECK:STDERR: let x: i32 = if true then 1 else 0;
// CHECK:STDERR: ^~~~~~
// CHECK:STDERR:
// CHECK:STDERR: fail_basic.carbon:[[@LINE+4]]:14: error: semantics TODO: `Control flow expressions are currently only supported inside functions.` [SemanticsTodo]
// CHECK:STDERR: let x: i32 = if true then 1 else 0;
// CHECK:STDERR: ^~~~~~~~~~~~~~~~~~~~~
// CHECK:STDERR:
let x: i32 = if true then 1 else 0;
// --- fail_types.carbon
library "[[@TEST_NAME]]";
// CHECK:STDERR: fail_types.carbon:[[@LINE+4]]:8: error: semantics TODO: `Control flow expressions are currently only supported inside functions.` [SemanticsTodo]
// CHECK:STDERR: var y: if true then i32 else f64;
// CHECK:STDERR: ^~~~~~~~~~~~~~~~~~~~~~~~~
// CHECK:STDERR:
var y: if true then i32 else f64;
// --- fail_in_param.carbon
library "[[@TEST_NAME]]";
// CHECK:STDERR: fail_in_param.carbon:[[@LINE+4]]:9: error: semantics TODO: `Control flow expressions are currently only supported inside functions.` [SemanticsTodo]
// CHECK:STDERR: fn F(a: if true then i32 else f64);
// CHECK:STDERR: ^~~~~~~~~~~~~~~~~~~~~~~~~
// CHECK:STDERR:
fn F(a: if true then i32 else f64);
// --- fail_class.carbon
library "[[@TEST_NAME]]";
class C {
// CHECK:STDERR: fail_class.carbon:[[@LINE+12]]:10: error: semantics TODO: `Control flow expressions are currently only supported inside functions.` [SemanticsTodo]
// CHECK:STDERR: var n: if true then i32 else f64;
// CHECK:STDERR: ^~~~~~~
// CHECK:STDERR:
// CHECK:STDERR: fail_class.carbon:[[@LINE+8]]:18: error: semantics TODO: `Control flow expressions are currently only supported inside functions.` [SemanticsTodo]
// CHECK:STDERR: var n: if true then i32 else f64;
// CHECK:STDERR: ^~~~~~~~
// CHECK:STDERR:
// CHECK:STDERR: fail_class.carbon:[[@LINE+4]]:10: error: semantics TODO: `Control flow expressions are currently only supported inside functions.` [SemanticsTodo]
// CHECK:STDERR: var n: if true then i32 else f64;
// CHECK:STDERR: ^~~~~~~~~~~~~~~~~~~~~~~~~
// CHECK:STDERR:
var n: if true then i32 else f64;
}
// --- fail_nested_class.carbon
library "[[@TEST_NAME]]";
base class C(T:! type) {}
fn F() {
class B {
// CHECK:STDERR: fail_nested_class.carbon:[[@LINE+4]]:20: error: semantics TODO: `Control flow expressions are currently only supported inside functions.` [SemanticsTodo]
// CHECK:STDERR: extend base: C(if true then i32 else i32);
// CHECK:STDERR: ^~~~~~~~~~~~~~~~~~~~~~~~~
// CHECK:STDERR:
extend base: C(if true then i32 else i32);
}
}
// CHECK:STDOUT: --- fail_basic.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: --- fail_types.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: --- fail_in_param.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: --- fail_class.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %C: type = class_type @C [concrete]
// CHECK:STDOUT: %true: bool = bool_literal true [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: class @C {
// CHECK:STDOUT: %true: bool = bool_literal true [concrete = constants.%true]
// CHECK:STDOUT: if %true br !if.expr.then else br !if.expr.else
// CHECK:STDOUT: complete_type_witness = invalid
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT: .Self = constants.%C
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: --- fail_nested_class.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %T: type = bind_symbolic_name T, 0 [symbolic]
// CHECK:STDOUT: %C.type: type = generic_class_type @C [concrete]
// CHECK:STDOUT: %C.generic: %C.type = struct_value () [concrete]
// CHECK:STDOUT: %C: type = class_type @C, @C(%T) [symbolic]
// CHECK:STDOUT: %empty_struct_type: type = struct_type {} [concrete]
// CHECK:STDOUT: %complete_type.357: <witness> = complete_type_witness %empty_struct_type [concrete]
// CHECK:STDOUT: %B: type = class_type @B [concrete]
// CHECK:STDOUT: %true: bool = bool_literal true [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: generic class @C(<unexpected>.ir4.inst20.loc4_14: type) {
// CHECK:STDOUT: %T: type = bind_symbolic_name T, 0 [symbolic = %T (constants.%T)]
// CHECK:STDOUT:
// CHECK:STDOUT: !definition:
// CHECK:STDOUT:
// CHECK:STDOUT: class {
// CHECK:STDOUT: %complete_type: <witness> = complete_type_witness constants.%empty_struct_type [concrete = constants.%complete_type.357]
// CHECK:STDOUT: complete_type_witness = %complete_type
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT: .Self = constants.%C
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: class @B {
// CHECK:STDOUT: %C.ref: %C.type = name_ref C, <unexpected>.ir4.inst25.loc4_24 [concrete = constants.%C.generic]
// CHECK:STDOUT: %true: bool = bool_literal true [concrete = constants.%true]
// CHECK:STDOUT: if %true br !if.expr.then else br !if.expr.else
// CHECK:STDOUT: complete_type_witness = invalid
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT: .Self = constants.%B
// CHECK:STDOUT: .C = <poisoned>
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @F();
// CHECK:STDOUT:
// CHECK:STDOUT: specific @C(constants.%T) {
// CHECK:STDOUT: %T => constants.%T
// CHECK:STDOUT: }
// CHECK:STDOUT:
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