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https://github.com/carbon-language/carbon-lang.git
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Jon Ross-Perkins
39f7aae98d
This shifts logic so that bindings are added to name lookup only after the scope is complete, removing logic around adding/removing/re-adding names in certain scopes. This does mean that things like a function's forward declaration will need to go through an extra hoop for name conflict checks, because under this approach a function definition does conflict checking when it adds names for the body's use. But, that seems easy to address, and better than the current hoops.
68 lines
2.5 KiB
C++
68 lines
2.5 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/semantics/semantics_context.h"
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namespace Carbon {
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auto SemanticsHandleCallExpression(SemanticsContext& context,
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ParseTree::Node parse_node) -> bool {
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auto refs_id = context.ParamOrArgEnd(
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/*for_args=*/true, ParseNodeKind::CallExpressionStart);
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// TODO: Convert to call expression.
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auto [call_expr_parse_node, name_id] =
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context.node_stack().PopWithParseNode<SemanticsNodeId>(
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ParseNodeKind::CallExpressionStart);
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auto name_node = context.semantics_ir().GetNode(name_id);
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if (name_node.kind() != SemanticsNodeKind::FunctionDeclaration) {
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// TODO: Work on error.
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context.TODO(parse_node, "Not a callable name");
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context.node_stack().Push(parse_node, name_id);
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return true;
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}
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auto function_id = name_node.GetAsFunctionDeclaration();
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auto callable = context.semantics_ir().GetFunction(function_id);
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CARBON_DIAGNOSTIC(NoMatchingCall, Error, "No matching callable was found.");
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auto diagnostic =
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context.emitter().Build(call_expr_parse_node, NoMatchingCall);
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if (!context.ImplicitAsForArgs(refs_id, name_node.parse_node(),
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callable.param_refs_id, &diagnostic)) {
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diagnostic.Emit();
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context.node_stack().Push(parse_node, SemanticsNodeId::BuiltinInvalidType);
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return true;
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}
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CARBON_CHECK(context.ImplicitAsForArgs(refs_id, name_node.parse_node(),
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callable.param_refs_id,
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/*diagnostic=*/nullptr));
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// TODO: Propagate return types from callable.
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auto call_node_id = context.AddNode(SemanticsNode::Call::Make(
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call_expr_parse_node, callable.return_type_id, refs_id, function_id));
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context.node_stack().Push(parse_node, call_node_id);
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return true;
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}
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auto SemanticsHandleCallExpressionComma(SemanticsContext& context,
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ParseTree::Node /*parse_node*/)
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-> bool {
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context.ParamOrArgComma(/*for_args=*/true);
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return true;
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}
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auto SemanticsHandleCallExpressionStart(SemanticsContext& context,
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ParseTree::Node parse_node) -> bool {
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auto name_id =
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context.node_stack().Pop<SemanticsNodeId>(ParseNodeKind::NameReference);
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context.node_stack().Push(parse_node, name_id);
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context.ParamOrArgStart();
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return true;
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}
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} // namespace Carbon
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