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https://github.com/carbon-language/carbon-lang.git
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Jon Ross-PerkinsandRichard Smith
c0ee446cec
`AddDefaultValue` doesn't quite capture the intended semantics; it should typically be replaced with an actual value when dealing with control flows. Trying to indicate the "assign later" with `AddPlaceholder`, mirroring `AddPlaceholderInst`. Shifting the `protected` functionality on `BlockValueStore` so that it's not providing functions just for `InstBlockStore` to use. Also hoping that seeing the comments next to the function name makes them easier to understand, whereas `using` buries that a little. --------- Co-authored-by: Richard Smith <richard@metafoo.co.uk>
81 lines
2.4 KiB
C++
81 lines
2.4 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/inst_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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namespace Carbon::Check {
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auto InstBlockStack::Push(SemIR::InstBlockId id) -> void {
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CARBON_VLOG("{0} Push {1}\n", name_, id_stack_.size());
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CARBON_CHECK(id_stack_.size() < (1 << 20),
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"Excessive stack size: likely infinite loop");
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id_stack_.push_back(id);
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insts_stack_.PushArray();
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}
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auto InstBlockStack::Push(SemIR::InstBlockId id,
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llvm::ArrayRef<SemIR::InstId> inst_ids) -> void {
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Push(id);
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insts_stack_.AppendToTop(inst_ids);
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}
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auto InstBlockStack::PeekOrAdd(int depth) -> SemIR::InstBlockId {
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CARBON_CHECK(static_cast<int>(id_stack_.size()) > depth, "no such block");
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int index = id_stack_.size() - depth - 1;
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auto& slot = id_stack_[index];
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if (!slot.has_value()) {
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slot = sem_ir_->inst_blocks().AddPlaceholder();
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}
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return slot;
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}
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auto InstBlockStack::Pop() -> SemIR::InstBlockId {
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CARBON_CHECK(!empty(), "no current block");
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auto id = id_stack_.pop_back_val();
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auto insts = insts_stack_.PeekArray();
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// Finalize the block.
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if (!insts.empty() && id != SemIR::InstBlockId::Unreachable) {
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if (id.has_value()) {
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sem_ir_->inst_blocks().ReplacePlaceholder(id, insts);
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} else {
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id = sem_ir_->inst_blocks().Add(insts);
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}
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}
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insts_stack_.PopArray();
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CARBON_VLOG("{0} Pop {1}: {2}\n", name_, id_stack_.size(), id);
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return id.has_value() ? id : SemIR::InstBlockId::Empty;
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}
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auto InstBlockStack::PopAndDiscard() -> void {
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CARBON_CHECK(!empty(), "no current block");
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id_stack_.pop_back();
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insts_stack_.PopArray();
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CARBON_VLOG("{0} PopAndDiscard {1}\n", name_, id_stack_.size());
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}
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auto InstBlockStack::PrintForStackDump(int indent,
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llvm::raw_ostream& output) const
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-> void {
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output.indent(indent);
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output << name_ << ":\n";
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for (const auto& [i, id] : llvm::enumerate(id_stack_)) {
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output.indent(indent + 2);
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output << i << ".\t" << id << "\t{";
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llvm::ListSeparator sep;
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for (auto id : insts_stack_.PeekArrayAt(i)) {
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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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