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https://github.com/carbon-language/carbon-lang.git
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Richard Smith
947c1eb527
As described in proposal #4682, make `array(T, N)` be syntactic sugar for the type `Core.Array` defined in the standard library. This provides a home for impls that are specific to `Core.Array`. Assisted-by: Gemini and Claude via Antigravity
85 lines
3.1 KiB
C++
85 lines
3.1 KiB
C++
// 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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#include "toolchain/check/context.h"
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#include "toolchain/check/convert.h"
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#include "toolchain/check/handle.h"
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#include "toolchain/check/inst.h"
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#include "toolchain/check/literal.h"
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#include "toolchain/check/type.h"
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#include "toolchain/parse/node_kind.h"
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namespace Carbon::Check {
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auto HandleParseNode(Context& /*context*/,
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Parse::ArrayExprOpenParenId /*node_id*/) -> bool {
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return true;
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}
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auto HandleParseNode(Context& /*context*/,
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Parse::ArrayExprKeywordId /*node_id*/) -> bool {
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return true;
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}
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auto HandleParseNode(Context& /*context*/, Parse::ArrayExprCommaId /*node_id*/)
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-> bool {
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return true;
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}
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auto HandleParseNode(Context& context, Parse::ArrayExprId node_id) -> bool {
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auto bound_inst_id = context.node_stack().PopExpr();
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auto [element_type_node_id, element_type_inst_id] =
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context.node_stack().PopExprWithNodeId();
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auto element_type =
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ExprAsType(context, element_type_node_id, element_type_inst_id);
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// The array bound must be a constant. Diagnose this prior to conversion
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// because conversion to `IntLiteral` will produce a generic "non-constant
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// call to compile-time-only function" error.
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//
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// TODO: Should we support runtime-phase bounds in cases such as:
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// comptime fn F(n: i32) -> type { return array(i32; n); }
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if (!context.constant_values().Get(bound_inst_id).is_constant()) {
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CARBON_DIAGNOSTIC(InvalidArrayExpr, Error, "array bound is not a constant");
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context.emitter().Emit(bound_inst_id, InvalidArrayExpr);
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context.node_stack().Push(node_id, SemIR::ErrorInst::InstId);
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return true;
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}
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bound_inst_id = ConvertToValueOfType(
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context, SemIR::LocId(bound_inst_id), bound_inst_id,
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GetSingletonType(context, SemIR::IntLiteralType::TypeInstId));
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if (element_type.type_id == SemIR::ErrorInst::TypeId) {
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context.node_stack().Push(node_id, SemIR::ErrorInst::InstId);
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return true;
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}
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// Diagnose an invalid concrete bound here, rather than when completing
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// `Core.Array` below, so that the diagnostic points at the bound.
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//
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// As with `Core.Int`, an invalid symbolic bound is diagnosed only when the
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// type is completed.
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// TODO: Express the constraint on the bound in the prelude.
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if (!ValidateArrayType(
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context, SemIR::LocId(bound_inst_id),
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{.type_id = SemIR::TypeType::TypeId,
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.bound_id =
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context.constant_values().GetConstantInstId(bound_inst_id),
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.element_type_inst_id = element_type.inst_id})) {
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context.node_stack().Push(node_id, SemIR::ErrorInst::InstId);
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return true;
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}
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// `array(T, N)` is `Core.Array(T, N)`. The call is attributed to the
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// `array(T, N)` expression, so that the resulting type has a location.
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auto type_expr =
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MakeArrayType(context, node_id, element_type.inst_id, bound_inst_id);
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context.node_stack().Push(node_id, type_expr.inst_id);
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return true;
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}
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} // namespace Carbon::Check
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