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Jon Ross-Perkins
6c458ffe7e
As discussed around #3792, identify the import a diagnostic message came from prior to the diagnostic message itself. This occurs during location translation so that the logic can be central. I'd considered associating the parse node with ImportRef instructions, but I realized about halfway through that because I need to store the ImportDirectiveId on the ImportIR for cross-package imports, it's there for use in location translation without extra work. That saves a fair amount of stringing it through declarations, as well as an oddity where ImportRef instructions would have a node that didn't really represent them.
105 lines
3.6 KiB
C++
105 lines
3.6 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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#ifndef CARBON_TOOLCHAIN_PARSE_TREE_NODE_DIAGNOSTIC_CONVERTER_H_
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#define CARBON_TOOLCHAIN_PARSE_TREE_NODE_DIAGNOSTIC_CONVERTER_H_
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#include "toolchain/diagnostics/diagnostic_emitter.h"
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#include "toolchain/lex/tokenized_buffer.h"
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#include "toolchain/parse/tree.h"
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namespace Carbon::Parse {
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class NodeLocation {
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public:
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// NOLINTNEXTLINE(google-explicit-constructor)
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NodeLocation(NodeId node_id) : NodeLocation(node_id, false) {}
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NodeLocation(NodeId node_id, bool token_only)
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: node_id_(node_id), token_only_(token_only) {}
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// TODO: Have some other way of representing diagnostic that applies to a file
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// as a whole.
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// NOLINTNEXTLINE(google-explicit-constructor)
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NodeLocation(InvalidNodeId node_id) : NodeLocation(node_id, false) {}
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auto node_id() const -> NodeId { return node_id_; }
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auto token_only() const -> bool { return token_only_; }
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private:
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NodeId node_id_;
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bool token_only_;
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};
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inline auto TokenOnly(NodeId node_id) -> NodeLocation {
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return NodeLocation(node_id, true);
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}
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class NodeLocationConverter : public DiagnosticConverter<NodeLocation> {
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public:
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explicit NodeLocationConverter(const Lex::TokenizedBuffer* tokens,
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llvm::StringRef filename,
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const Tree* parse_tree)
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: token_converter_(tokens),
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filename_(filename),
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parse_tree_(parse_tree) {}
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// Map the given token into a diagnostic location.
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auto ConvertLocation(NodeLocation node_location, ContextFnT context_fn) const
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-> DiagnosticLocation override {
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// Support the invalid token as a way to emit only the filename, when there
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// is no line association.
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if (!node_location.node_id().is_valid()) {
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return {.filename = filename_};
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}
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if (node_location.token_only()) {
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return token_converter_.ConvertLocation(
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parse_tree_->node_token(node_location.node_id()), context_fn);
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}
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// Construct a location that encompasses all tokens that descend from this
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// node (including the root).
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Lex::TokenIndex start_token =
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parse_tree_->node_token(node_location.node_id());
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Lex::TokenIndex end_token = start_token;
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for (NodeId desc : parse_tree_->postorder(node_location.node_id())) {
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Lex::TokenIndex desc_token = parse_tree_->node_token(desc);
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if (!desc_token.is_valid()) {
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continue;
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}
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if (desc_token < start_token) {
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start_token = desc_token;
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} else if (desc_token > end_token) {
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end_token = desc_token;
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}
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}
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DiagnosticLocation start_loc =
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token_converter_.ConvertLocation(start_token, context_fn);
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if (start_token == end_token) {
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return start_loc;
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}
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DiagnosticLocation end_loc =
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token_converter_.ConvertLocation(end_token, context_fn);
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// For multiline locations we simply return the rest of the line for now
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// since true multiline locations are not yet supported.
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if (start_loc.line_number != end_loc.line_number) {
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start_loc.length = start_loc.line.size() - start_loc.column_number + 1;
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} else {
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if (start_loc.column_number != end_loc.column_number) {
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start_loc.length =
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end_loc.column_number + end_loc.length - start_loc.column_number;
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}
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}
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return start_loc;
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}
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private:
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Lex::TokenDiagnosticConverter token_converter_;
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llvm::StringRef filename_;
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const Tree* parse_tree_;
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};
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} // namespace Carbon::Parse
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#endif // CARBON_TOOLCHAIN_PARSE_TREE_NODE_DIAGNOSTIC_CONVERTER_H_
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