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https://github.com/carbon-language/carbon-lang.git
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Jon Ross-Perkins
94cbb9d917
Lazy allocation means that we can use a single node block for _all_ empty node blocks. The change in timing for when the definition node is emitted shouldn't affect semantic correctness; the signature is already present for recursive calls.
49 lines
1.5 KiB
C++
49 lines
1.5 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_node_block_stack.h"
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#include "common/vlog.h"
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#include "toolchain/semantics/semantics_node.h"
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namespace Carbon {
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auto SemanticsNodeBlockStack::Push() -> void {
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CARBON_VLOG() << "NodeBlock Push " << stack_.size() << "\n";
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CARBON_CHECK(stack_.size() < (1 << 20))
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<< "Excessive stack size: likely infinite loop";
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stack_.push_back(SemanticsNodeBlockId::Invalid);
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}
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auto SemanticsNodeBlockStack::PeekForAdd() -> SemanticsNodeBlockId {
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auto& back = stack_.back();
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if (!back.is_valid()) {
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SemanticsNodeBlockId block_id(node_blocks_->size());
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node_blocks_->resize(block_id.index + 1);
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back = block_id;
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CARBON_VLOG() << "NodeBlock Add " << stack_.size() - 1 << ": " << back
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<< "\n";
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}
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return back;
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}
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auto SemanticsNodeBlockStack::Pop() -> SemanticsNodeBlockId {
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auto back = stack_.pop_back_val();
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CARBON_VLOG() << "NodeBlock Pop " << stack_.size() << ": " << back << "\n";
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if (!back.is_valid()) {
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return SemanticsNodeBlockId::Empty;
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}
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return back;
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}
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auto SemanticsNodeBlockStack::PrintForStackDump(llvm::raw_ostream& output) const
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-> void {
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output << "SemanticsNodeBlockStack:\n";
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for (int i = 0; i < static_cast<int>(stack_.size()); ++i) {
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output << "\t" << i << ".\t" << stack_[i] << "\n";
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}
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}
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} // namespace Carbon
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