mirror of
https://github.com/carbon-language/carbon-lang.git
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Jon Ross-Perkins
10647b70a4
Just opening files in vscode and seeing what clangd flags. Some edits to ostream.h to stop it from getting flagged (the usage pattern means it's not always obviously used).
66 lines
2.2 KiB
C++
66 lines
2.2 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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#ifndef CARBON_TOOLCHAIN_SEMANTICS_SEMANTICS_NODE_BLOCK_STACK_H_
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#define CARBON_TOOLCHAIN_SEMANTICS_SEMANTICS_NODE_BLOCK_STACK_H_
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#include <type_traits>
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#include "llvm/ADT/SmallVector.h"
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#include "toolchain/semantics/semantics_node.h"
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namespace Carbon {
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// Wraps the stack of node blocks for SemanticsParseTreeHandler.
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//
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// All pushes and pops will be vlogged.
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class SemanticsNodeBlockStack {
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public:
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explicit SemanticsNodeBlockStack(
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llvm::StringLiteral name,
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llvm::SmallVector<llvm::SmallVector<SemanticsNodeId>>& node_blocks,
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llvm::raw_ostream* vlog_stream)
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: name_(name), node_blocks_(&node_blocks), vlog_stream_(vlog_stream) {}
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// Pushes a new node block. It will be invalid unless PeekForAdd is called in
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// order to support lazy allocation.
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auto Push() -> void;
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// Peeks at the top node block. This does not trigger lazy allocation, so the
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// returned node block may be invalid.
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auto Peek() -> SemanticsNodeBlockId { return stack_.back(); }
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// Returns the top node block, allocating one if it's still invalid.
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auto PeekForAdd() -> SemanticsNodeBlockId;
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// Pops the top node block. This will always return a valid node block;
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// SemanticsNodeBlockId::Empty is returned if one wasn't allocated.
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auto Pop() -> SemanticsNodeBlockId;
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// Prints the stack for a stack dump.
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auto PrintForStackDump(llvm::raw_ostream& output) const -> void;
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auto empty() const -> bool { return stack_.empty(); }
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auto size() const -> size_t { return stack_.size(); }
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private:
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// A name for debugging.
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llvm::StringLiteral name_;
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// The underlying node block storage on SemanticsIR. Always non-null.
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llvm::SmallVector<llvm::SmallVector<SemanticsNodeId>>* const node_blocks_;
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// Whether to print verbose output.
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llvm::raw_ostream* vlog_stream_;
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// The actual stack.
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// PushEntry and PopEntry control modification in order to centralize
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// vlogging.
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llvm::SmallVector<SemanticsNodeBlockId> stack_;
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};
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} // namespace Carbon
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#endif // CARBON_TOOLCHAIN_SEMANTICS_SEMANTICS_NODE_BLOCK_STACK_H_
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