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https://github.com/carbon-language/carbon-lang.git
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Jon Ross-Perkins
1c748c0f14
Continuing along with #3070. Note this is just a file rename, with BUILD edits; every file previously in semantics/ should show as moved (except maybe BUILDs, which split).
90 lines
2.8 KiB
C++
90 lines
2.8 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_CHECK_NODE_BLOCK_STACK_H_
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#define CARBON_TOOLCHAIN_CHECK_NODE_BLOCK_STACK_H_
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#include "llvm/ADT/SmallVector.h"
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#include "toolchain/sem_ir/file.h"
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#include "toolchain/sem_ir/node.h"
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namespace Carbon::Check {
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// Wraps the stack of node blocks for Context.
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//
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// All pushes and pops will be vlogged.
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class NodeBlockStack {
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public:
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explicit NodeBlockStack(llvm::StringLiteral name, SemIR::File& semantics_ir,
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llvm::raw_ostream* vlog_stream)
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: name_(name), semantics_ir_(&semantics_ir), vlog_stream_(vlog_stream) {}
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// Pushes an existing node block.
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auto Push(SemIR::NodeBlockId id) -> void;
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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 { Push(SemIR::NodeBlockId::Invalid); }
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// Pushes a new unreachable code block.
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auto PushUnreachable() -> void { Push(SemIR::NodeBlockId::Unreachable); }
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// Allocates and pushes a new node block.
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auto PushForAdd() -> SemIR::NodeBlockId {
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Push();
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return PeekForAdd();
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}
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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() -> SemIR::NodeBlockId {
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CARBON_CHECK(!stack_.empty()) << "no current block";
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return stack_.back();
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}
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// Returns the top node block, allocating one if it's still invalid.
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auto PeekForAdd() -> SemIR::NodeBlockId;
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// Pops the top node block. This will always return a valid node block;
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// SemIR::NodeBlockId::Empty is returned if one wasn't allocated.
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auto Pop() -> SemIR::NodeBlockId;
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// Pops the top node block, ensuring that it is lazily allocated if it's
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// empty. For use when more nodes will be added to the block later.
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auto PopForAdd() -> SemIR::NodeBlockId {
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PeekForAdd();
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return Pop();
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}
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// Returns whether the current block is statically reachable.
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auto is_current_block_reachable() -> bool {
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return Peek() != SemIR::NodeBlockId::Unreachable;
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}
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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 SemIR::File instance. Always non-null.
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SemIR::File* semantics_ir_;
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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<SemIR::NodeBlockId> stack_;
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};
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} // namespace Carbon::Check
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#endif // CARBON_TOOLCHAIN_CHECK_NODE_BLOCK_STACK_H_
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