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https://github.com/carbon-language/carbon-lang.git
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Jon Ross-Perkins
4923445e3a
We frequently want to operate on singletons. Per discussion, drop `Singleton` to make the code shorter. This started off as wanting to write `inst_id.is_error()`, but the dependency relationship between ids.h and singleton_insts.h would require some kind of delayed evaluation to allow the implementation to remain in headers (which I suspect is helpful to have for inlining). I could have added something like `IsErrorInst`, forward declared in ids.h and defined in singleton_insts.h (which would always be included by typed_insts.h), but the template approach felt like a decent balance between (a) removing the boilerplate `::SingletonInstId`, (b) understandability, (c) still visually mirroring if we immediately return a singleton, and (d) flexibility for more than just `ErrorInst`. But TBH I'd probably still have written `is_error()` if it didn't require addressing the cross-header cycle. Then I tried `SemIR::InstId::Is<SemIR::ErrorInst>`, which generally worked with types but generated the complaint that it didn't shorten *all* singleton uses. So pulling back on `::Is`, and instead just dropping `Singleton`.
62 lines
2.1 KiB
C++
62 lines
2.1 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/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, context.insts().GetLocId(bound_inst_id), bound_inst_id,
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GetSingletonType(context, SemIR::IntLiteralType::InstId));
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AddInstAndPush<SemIR::ArrayType>(
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context, node_id,
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{.type_id = SemIR::TypeType::TypeId,
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.bound_id = bound_inst_id,
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.element_type_inst_id = element_type.inst_id});
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return true;
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}
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} // namespace Carbon::Check
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