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https://github.com/carbon-language/carbon-lang.git
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Richard Smith
a66f35e92c
`SemIR` now only stores complete blocks, and placeholders for blocks where we need a block ID before we know the block contents. This is a preparation step towards the new node block allocation design.
71 lines
2.0 KiB
C++
71 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/node_block_stack.h"
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#include "common/vlog.h"
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#include "llvm/ADT/STLExtras.h"
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#include "llvm/ADT/StringExtras.h"
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#include "toolchain/sem_ir/node.h"
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namespace Carbon::Check {
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auto NodeBlockStack::Push(SemIR::NodeBlockId id) -> void {
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CARBON_VLOG() << name_ << " Push " << size_ << "\n";
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CARBON_CHECK(size_ < (1 << 20))
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<< "Excessive stack size: likely infinite loop";
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if (size_ == static_cast<int>(stack_.size())) {
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stack_.emplace_back();
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}
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stack_[size_].Reset(id);
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++size_;
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}
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auto NodeBlockStack::PeekForAdd(int depth) -> SemIR::NodeBlockId {
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CARBON_CHECK(size() > depth) << "no such block";
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int index = size() - depth - 1;
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auto& slot = stack_[index];
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if (!slot.id.is_valid()) {
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slot.id = semantics_ir_->AddNodeBlockId();
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CARBON_VLOG() << name_ << " Add " << index << ": " << slot.id << "\n";
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}
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return slot.id;
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}
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auto NodeBlockStack::Pop() -> SemIR::NodeBlockId {
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CARBON_CHECK(!empty()) << "no current block";
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--size_;
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auto& back = stack_[size_];
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// Finalize the block.
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if (!back.content.empty() && back.id != SemIR::NodeBlockId::Unreachable) {
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if (back.id.is_valid()) {
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semantics_ir_->SetNodeBlock(back.id, back.content);
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} else {
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back.id = semantics_ir_->AddNodeBlock(back.content);
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}
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}
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CARBON_VLOG() << name_ << " Pop " << size_ << ": " << back.id << "\n";
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if (!back.id.is_valid()) {
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return SemIR::NodeBlockId::Empty;
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}
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return back.id;
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}
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auto NodeBlockStack::PrintForStackDump(llvm::raw_ostream& output) const
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-> void {
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output << name_ << ":\n";
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for (const auto& [i, entry] : llvm::enumerate(stack_)) {
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output << "\t" << i << ".\t" << entry.id << "\t{";
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llvm::ListSeparator sep;
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for (auto id : entry.content) {
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output << sep << id;
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}
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output << "}\n";
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}
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}
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} // namespace Carbon::Check
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