mirror of
https://github.com/carbon-language/carbon-lang.git
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Dana Jansensandzygoloid
24bde46181
In line with the proposal in #4682, this changes the array syntax to be array(T, N). `array` is a builtin keyword which must be followed by parens containing two expressions and a separating comma. The array type expression is still fully builtin, it does not forward to a Core.Array library type yet. It merely adds the `ArrayType` instruction, as was done with the previous syntax. Followup work will change the instruction to reference to Core.Array, once the library type exists and can be used directly. --------- Co-authored-by: zygoloid <richard@metafoo.co.uk>
61 lines
2.2 KiB
C++
61 lines
2.2 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/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_id =
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ExprAsType(context, element_type_node_id, element_type_inst_id).type_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::SingletonInstId);
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return true;
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}
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bound_inst_id = ConvertToValueOfType(
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context, context.insts().GetLocId(bound_inst_id), bound_inst_id,
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GetSingletonType(context, SemIR::IntLiteralType::SingletonInstId));
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AddInstAndPush<SemIR::ArrayType>(context, node_id,
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{.type_id = SemIR::TypeType::SingletonTypeId,
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.bound_id = bound_inst_id,
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.element_type_id = element_type_id});
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return true;
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}
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} // namespace Carbon::Check
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