mirror of
https://github.com/carbon-language/carbon-lang.git
synced 2026-09-24 21:30:12 +01:00
Richard Smith
c78751338b
Add support for "jump to declaration", "find references", type information on hover. This support is strictly single-file for now; only references and declarations within the same file are found. We could go a bit beyond that, but to properly handle cross-file references we'll need to build an index and a compilation database, which is beyond the scope of this change. On hover, we provide the type information for the instruction under the cursor as-is. This is frequently not very useful, as the type of a function F is simply "<type of F>", but is a starting point for richer information. Assisted-by: Claude Code
102 lines
3.7 KiB
C++
102 lines
3.7 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/language_server/sem_ir_index.h"
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#include "common/check.h"
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#include "toolchain/lex/token_kind.h"
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#include "toolchain/parse/node_kind.h"
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#include "toolchain/parse/tree.h"
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#include "toolchain/sem_ir/ids.h"
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namespace Carbon::LanguageServer {
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auto GetNameToken(const Parse::TreeAndSubtrees& tree_and_subtrees,
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Parse::NodeId node_id) -> Lex::TokenIndex {
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const auto& tree = tree_and_subtrees.tree();
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const auto& tokens = tree.tokens();
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for (auto child : tree_and_subtrees.children(node_id)) {
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switch (tree.node_kind(child)) {
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case Parse::NodeKind::IdentifierNameMaybeBeforeSignature:
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case Parse::NodeKind::IdentifierNameNotBeforeSignature: {
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auto token = tree.node_token(child);
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if (tokens.GetKind(token) == Lex::TokenKind::Identifier) {
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return token;
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}
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break;
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}
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default:
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break;
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}
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}
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return tree.node_token(node_id);
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}
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// Returns the token that `inst_id` was checked from, or `None` if it has no
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// location in this file. Instructions imported from another file are located by
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// an `ImportIRInstId`, and desugared instructions by the instruction they were
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// desugared from, so only a `NodeId` location refers to this file's tokens.
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static auto GetTokenForInst(const SemIR::File& sem_ir,
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const Parse::TreeAndSubtrees& tree_and_subtrees,
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SemIR::InstId inst_id) -> Lex::TokenIndex {
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auto loc_id = sem_ir.insts().GetCanonicalLocId(inst_id);
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if (loc_id.kind() != SemIR::LocId::Kind::NodeId) {
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return Lex::TokenIndex::None;
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}
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auto node_id = loc_id.node_id();
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if (!node_id.has_value()) {
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return Lex::TokenIndex::None;
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}
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return GetNameToken(tree_and_subtrees, node_id);
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}
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SemIRIndex::SemIRIndex(const SemIR::File& sem_ir,
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const Parse::TreeAndSubtrees& tree_and_subtrees) {
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const auto& tokens = tree_and_subtrees.tree().tokens();
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// Count the instructions per token, leaving a leading zero so that the counts
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// can be turned into start offsets in place.
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token_starts_.assign(tokens.size() + 1, 0);
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int32_t total = 0;
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for (auto [inst_id, inst] : sem_ir.insts().enumerate()) {
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auto token = GetTokenForInst(sem_ir, tree_and_subtrees, inst_id);
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if (!token.has_value()) {
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continue;
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}
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++token_starts_[token.index + 1];
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++total;
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}
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// Turn the counts into start offsets.
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for (size_t i = 1; i < token_starts_.size(); ++i) {
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token_starts_[i] += token_starts_[i - 1];
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}
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CARBON_CHECK(token_starts_.back() == total);
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// Fill each token's group. `next` tracks the next free slot per token, and
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// ends up equal to the following token's start, so the offsets stay valid.
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insts_.resize(total, SemIR::InstId::None);
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llvm::SmallVector<int32_t> next(token_starts_.begin(), token_starts_.end());
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for (auto [inst_id, inst] : sem_ir.insts().enumerate()) {
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auto token = GetTokenForInst(sem_ir, tree_and_subtrees, inst_id);
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if (!token.has_value()) {
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continue;
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}
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insts_[next[token.index]++] = inst_id;
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}
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}
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auto SemIRIndex::InstsForToken(Lex::TokenIndex token) const
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-> llvm::ArrayRef<SemIR::InstId> {
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if (!token.has_value()) {
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return {};
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}
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CARBON_CHECK(static_cast<size_t>(token.index) + 1 < token_starts_.size(),
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"Token {0} is not from the indexed file", token.index);
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int32_t start = token_starts_[token.index];
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int32_t end = token_starts_[token.index + 1];
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return llvm::ArrayRef(insts_).slice(start, end - start);
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}
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} // namespace Carbon::LanguageServer
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