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https://github.com/carbon-language/carbon-lang.git
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Richard Smith
aba3c47467
Also, form `addr_of error` instead of `addr_of operand` when `operand` is not a reference expression, so that we don't try to constant-evaluate a meaningless expression. Also, expect a constant for an array bound rather than specifically an integer literal. This allows constant evaluation results to be more easily tested by inspecting array bounds.
58 lines
2.0 KiB
C++
58 lines
2.0 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/parse/node_kind.h"
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#include "toolchain/sem_ir/inst.h"
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namespace Carbon::Check {
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auto HandleArrayExprStart(Context& /*context*/,
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Parse::ArrayExprStartId /*parse_node*/) -> bool {
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return true;
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}
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auto HandleArrayExprSemi(Context& context, Parse::ArrayExprSemiId parse_node)
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-> bool {
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context.node_stack().Push(parse_node);
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return true;
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}
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auto HandleArrayExpr(Context& context, Parse::ArrayExprId parse_node) -> bool {
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// TODO: Handle array type with undefined bound.
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if (context.node_stack()
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.PopAndDiscardSoloParseNodeIf<Parse::NodeKind::ArrayExprSemi>()) {
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context.node_stack().PopAndIgnore();
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return context.TODO(parse_node, "HandleArrayExprWithoutBounds");
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}
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auto bound_inst_id = context.node_stack().PopExpr();
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context.node_stack()
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.PopAndDiscardSoloParseNode<Parse::NodeKind::ArrayExprSemi>();
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auto element_type_inst_id = context.node_stack().PopExpr();
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// The array bound must be a constant.
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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 [i32; n]; }
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auto bound_inst = context.constant_values().Get(bound_inst_id);
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if (!bound_inst.is_constant()) {
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CARBON_DIAGNOSTIC(InvalidArrayExpr, Error,
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"Array bound is not a constant.");
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context.emitter().Emit(context.insts().GetParseNode(bound_inst_id),
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InvalidArrayExpr);
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context.node_stack().Push(parse_node, SemIR::InstId::BuiltinError);
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return true;
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}
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context.AddInstAndPush(
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{parse_node, SemIR::ArrayType{
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SemIR::TypeId::TypeType, bound_inst_id,
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ExprAsType(context, parse_node, 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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