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Chandler Carruth
8be274cf60
Implement the toolchain side of proposal #7254, removing the `:!` binding syntax for generic and template parameters in favor of the keywords `generic`, `template`, and `runtime` plus contextual defaults for phase. For valid programs this is semantics-preserving: each binding resolves to the same phase, and produces the same SemIR, as it did under `:!`/`:`. The parser derives a binding's phase from its syntactic context plus any explicit phase keyword; new diagnostics and error recovery for misused keywords are described below. Implementation details for each component: - Lexer: remove the `:!` (`ColonExclaim`) token, move its virtual parse-node budget onto `:`, and add the `generic` and `runtime` keywords. - Parser: thread a `BindingContext` (`ExplicitParam`, `DeducedParam`, or `CompileTimeEntityParam`) from declaration introducers down through parameter lists to each binding pattern, using a one-token lookahead to distinguish a name-qualifier parameter list from a declaration's own final list. Parameters of a compile-time entity (`class`, `interface`, `constraint`, `choice`, `alias`, `export`, `namespace`) and deduced `[]` parameters default to checked generic; explicit function parameters and local bindings default to runtime. `HandleBindingPattern` resolves the phase from that context plus the keyword: a `generic` keyword needs no node of its own (the phase is carried by the binding's node kind), while a `runtime` keyword is preserved as a `RuntimeBindingName` node so `check` can name it in a diagnostic. A phase keyword that is merely redundant with the contextual default is diagnosed here, without invalidating the parse tree. - Check: a phase keyword that is invalid for its context (for example `runtime` on a checked-generic parameter) is diagnosed here, and recovers by building an error binding that still introduces the name so that later uses of it do not produce cascading errors. The removed `:!` syntax is now rejected as an ordinary parse error. The `form`/`:?`/`->?` ("extended types") portion of proposal #7254 is left for a separate change. Assisted-by: Claude Code
164 lines
5.7 KiB
Plaintext
164 lines
5.7 KiB
Plaintext
// Part of the Carbon Language project, under the Apache License v2.0 with LLVM
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// Exceptions. See /LICENSE for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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// INCLUDE-FILE: toolchain/testing/testdata/min_prelude/primitives.carbon
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//
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// AUTOUPDATE
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// TIP: To test this file alone, run:
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// TIP: bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/check/testdata/builtins/int/snegate.carbon
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// TIP: To dump output, run:
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// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/builtins/int/snegate.carbon
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// --- int_negate.carbon
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library "[[@TEST_NAME]]";
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fn Negate(a: i32) -> i32 = "int.snegate";
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var arr: array(i32, Negate(Negate(123)));
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let arr_p: array(i32, 123)* = &arr;
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let n: i32 = Negate(1);
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fn RuntimeCallIsValid(a: i32, unused b: i32) -> i32 {
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//@dump-sem-ir-begin
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return Negate(a);
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//@dump-sem-ir-end
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}
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// --- literal.carbon
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library "[[@TEST_NAME]]";
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fn Negate(a: Core.IntLiteral) -> Core.IntLiteral = "int.snegate";
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fn Sub(a: Core.IntLiteral, b: Core.IntLiteral) -> Core.IntLiteral = "int.ssub";
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class Expect(N: Core.IntLiteral) {}
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fn Test(generic N: Core.IntLiteral) -> Expect(N) { return {}; }
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fn F() {
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Test(Negate(0)) as Expect(0);
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Test(Negate(1)) as Expect(Sub(0, 1));
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Test(Negate(Sub(0, 0x8000_0000_0000_0000))) as Expect(0x8000_0000_0000_0000);
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}
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// --- fail_too_few.carbon
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library "[[@TEST_NAME]]";
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// CHECK:STDERR: fail_too_few.carbon:[[@LINE+4]]:1: error: invalid signature for builtin function "int.snegate" [InvalidBuiltinSignature]
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// CHECK:STDERR: fn TooFew() -> i32 = "int.snegate";
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// CHECK:STDERR: ^~~~~~~~~~~~~~~~~~~~
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// CHECK:STDERR:
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fn TooFew() -> i32 = "int.snegate";
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// CHECK:STDERR: fail_too_few.carbon:[[@LINE+4]]:25: error: array bound is not a constant [InvalidArrayExpr]
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// CHECK:STDERR: var too_few: array(i32, TooFew());
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// CHECK:STDERR: ^~~~~~~~
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// CHECK:STDERR:
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var too_few: array(i32, TooFew());
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fn RuntimeCallIsValidTooFew() -> i32 {
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return TooFew();
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}
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// --- fail_too_many.carbon
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library "[[@TEST_NAME]]";
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// CHECK:STDERR: fail_too_many.carbon:[[@LINE+4]]:1: error: invalid signature for builtin function "int.snegate" [InvalidBuiltinSignature]
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// CHECK:STDERR: fn TooMany(a: i32, b: i32) -> i32 = "int.snegate";
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// CHECK:STDERR: ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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// CHECK:STDERR:
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fn TooMany(a: i32, b: i32) -> i32 = "int.snegate";
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// CHECK:STDERR: fail_too_many.carbon:[[@LINE+4]]:26: error: array bound is not a constant [InvalidArrayExpr]
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// CHECK:STDERR: var too_many: array(i32, TooMany(1, 2));
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// CHECK:STDERR: ^~~~~~~~~~~~~
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// CHECK:STDERR:
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var too_many: array(i32, TooMany(1, 2));
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fn RuntimeCallIsValidTooMany(a: i32, b: i32) -> i32 {
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return TooMany(a, b);
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}
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// --- fail_bad_return_type.carbon
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library "[[@TEST_NAME]]";
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// CHECK:STDERR: fail_bad_return_type.carbon:[[@LINE+4]]:1: error: invalid signature for builtin function "int.snegate" [InvalidBuiltinSignature]
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// CHECK:STDERR: fn BadReturnType(a: i32) -> bool = "int.snegate";
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// CHECK:STDERR: ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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// CHECK:STDERR:
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fn BadReturnType(a: i32) -> bool = "int.snegate";
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// CHECK:STDERR: fail_bad_return_type.carbon:[[@LINE+4]]:33: error: array bound is not a constant [InvalidArrayExpr]
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// CHECK:STDERR: var bad_return_type: array(i32, BadReturnType(1));
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// CHECK:STDERR: ^~~~~~~~~~~~~~~~
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// CHECK:STDERR:
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var bad_return_type: array(i32, BadReturnType(1));
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fn RuntimeCallIsValidBadReturnType(a: i32) -> bool {
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return BadReturnType(a);
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}
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// --- fail_bad_call.carbon
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library "[[@TEST_NAME]]";
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fn Negate(a: i32) -> i32 = "int.snegate";
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// CHECK:STDERR: fail_bad_call.carbon:[[@LINE+7]]:26: error: 2 arguments passed to function expecting 1 argument [CallArgCountMismatch]
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// CHECK:STDERR: var bad_call: array(i32, Negate(1, 2));
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// CHECK:STDERR: ^~~~~~~~~~~~
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// CHECK:STDERR: fail_bad_call.carbon:[[@LINE-5]]:1: note: calling function declared here [InCallToEntity]
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// CHECK:STDERR: fn Negate(a: i32) -> i32 = "int.snegate";
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// CHECK:STDERR: ^~~~~~~~~~~~~~~~~~~~~~~~~~
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// CHECK:STDERR:
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var bad_call: array(i32, Negate(1, 2));
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// --- fail_overflow.carbon
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library "[[@TEST_NAME]]";
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fn Negate(a: i32) -> i32 = "int.snegate";
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fn Sub(a: i32, b: i32) -> i32 = "int.ssub";
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// -(-INT_MAX) is INT_MAX.
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let a: i32 = Negate(Negate(0x7FFF_FFFF));
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// -INT_MIN is too large for i32.
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// CHECK:STDERR: fail_overflow.carbon:[[@LINE+4]]:14: error: integer overflow in negation of -2147483648 [CompileTimeIntegerNegateOverflow]
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// CHECK:STDERR: let b: i32 = Negate(-0x8000_0000);
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// CHECK:STDERR: ^~~~~~~~~~~~~~~~~~~~
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// CHECK:STDERR:
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let b: i32 = Negate(-0x8000_0000);
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// CHECK:STDOUT: --- int_negate.carbon
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// CHECK:STDOUT:
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// CHECK:STDOUT: constants {
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// CHECK:STDOUT: %int_32: Core.IntLiteral = int_value 32 [concrete]
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// CHECK:STDOUT: %i32: type = class_type @Int, @Int(%int_32) [concrete]
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// CHECK:STDOUT: %Negate.type: type = fn_type @Negate [concrete]
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// CHECK:STDOUT: %Negate: %Negate.type = struct_value () [concrete]
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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// CHECK:STDOUT: fn @RuntimeCallIsValid(%a.param: %i32, %b.param: %i32) -> out %return.param: %i32 {
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// CHECK:STDOUT: !entry:
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// CHECK:STDOUT: %Negate.ref: %Negate.type = name_ref Negate, file.%Negate.decl [concrete = constants.%Negate]
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// CHECK:STDOUT: %a.ref: %i32 = name_ref a, %a
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// CHECK:STDOUT: %Negate.call: init %i32 = call %Negate.ref(%a.ref)
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// CHECK:STDOUT: return %Negate.call
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// CHECK:STDOUT:
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// CHECK:STDOUT: !observes:
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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// CHECK:STDOUT: fn @__global_init() {
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// CHECK:STDOUT: !entry:
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// CHECK:STDOUT: <elided>
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// CHECK:STDOUT:
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// CHECK:STDOUT: !observes:
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// CHECK:STDOUT: }
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// CHECK:STDOUT:
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