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https://github.com/carbon-language/carbon-lang.git
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Geoff Romer
96c7cfe41c
We used to have to batch these at the end of pattern traversal in order to avoid accidentally adding them to a block that was speculatively pushed for an expression within a pattern, but that's no longer a concern with the more precise handling of those speculative blocks in #7445.
51 lines
2.0 KiB
C++
51 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/full_pattern_stack.h"
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#include "toolchain/check/context.h"
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#include "toolchain/check/pattern.h"
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namespace Carbon::Check {
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auto FullPatternStack::StartPatternInitializer() -> void {
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CARBON_CHECK(kind_stack_.back() == Kind::ClassScopeVarDecl ||
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kind_stack_.back() == Kind::NameBindingDecl);
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for (auto& [name_id, inst_id] : bind_name_stack_.PeekArray()) {
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CARBON_CHECK(
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inst_id == SemIR::InstId::InitTombstone,
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"stashing the lookup result would overwrite an existing stash {0}",
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inst_id);
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auto& lookup_result = lookup_->Get(name_id);
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if (!lookup_result.empty()) {
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// Temporarily overwrite the result of name lookup for this binding to be
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// `InitTombstone`, so that references to it in the initializer are
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// diagnosed as errors. The original result of name lookup is stashed in
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// `bind_name_stack_` so we can restore it later.
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//
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// TODO: find a way to preserve location information, so that we can
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// provide good diagnostics for a redeclaration of `name_id` in
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// the initializer, if that becomes possible.
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std::swap(lookup_result.back().inst_id, inst_id);
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}
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}
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next_var_index_stack_.back() = 0;
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}
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auto FullPatternStack::EndPatternInitializer() -> void {
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for (auto& [name_id, inst_id] : bind_name_stack_.PeekArray()) {
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auto& lookup_result = lookup_->Get(name_id);
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if (!lookup_result.empty()) {
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// Restore the original result of name lookup for this binding.
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std::swap(lookup_result.back().inst_id, inst_id);
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}
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CARBON_CHECK(inst_id == SemIR::InstId::InitTombstone,
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"name_id resolved to a non-tombstone value {0} during "
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"initializer handling",
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inst_id);
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}
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}
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} // namespace Carbon::Check
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