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Jon Ross-Perkins
b0d49ba957
context.cpp is getting large, so I'm looking at a few ways to cut out clusters of functions. This felt like a logical cluster of functions to move to their own file. Note this doesn't touch the implementation at all, beyond what's needed to change from `Context` members to context args.
68 lines
3.3 KiB
C++
68 lines
3.3 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_CONTROL_FLOW_H_
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#define CARBON_TOOLCHAIN_CHECK_CONTROL_FLOW_H_
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#include "toolchain/check/context.h"
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#include "toolchain/sem_ir/ids.h"
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namespace Carbon::Check {
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// Adds a `Branch` instruction branching to a new instruction block, and
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// returns the ID of the new block. All paths to the branch target must go
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// through the current block, though not necessarily through this branch.
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auto AddDominatedBlockAndBranch(Context& context, Parse::NodeId node_id)
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-> SemIR::InstBlockId;
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// Adds a `Branch` instruction branching to a new instruction block with a
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// value, and returns the ID of the new block. All paths to the branch target
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// must go through the current block.
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auto AddDominatedBlockAndBranchWithArg(Context& context, Parse::NodeId node_id,
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SemIR::InstId arg_id)
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-> SemIR::InstBlockId;
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// Adds a `BranchIf` instruction branching to a new instruction block, and
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// returns the ID of the new block. All paths to the branch target must go
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// through the current block.
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auto AddDominatedBlockAndBranchIf(Context& context, Parse::NodeId node_id,
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SemIR::InstId cond_id) -> SemIR::InstBlockId;
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// Handles recovergence of control flow. Adds branches from the top
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// `num_blocks` on the instruction block stack to a new block, pops the
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// existing blocks, pushes the new block onto the instruction block stack,
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// and adds it to the most recently pushed region.
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auto AddConvergenceBlockAndPush(Context& context, Parse::NodeId node_id,
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int num_blocks) -> void;
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// Handles recovergence of control flow with a result value. Adds branches
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// from the top few blocks on the instruction block stack to a new block, pops
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// the existing blocks, pushes the new block onto the instruction block
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// stack, and adds it to the most recently pushed region. The number of blocks
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// popped is the size of `block_args`, and the corresponding result values are
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// the elements of `block_args`. Returns an instruction referring to the
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// result value.
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auto AddConvergenceBlockWithArgAndPush(
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Context& context, Parse::NodeId node_id,
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std::initializer_list<SemIR::InstId> block_args) -> SemIR::InstId;
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// Sets the constant value of a block argument created as the result of a
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// branch. `select_id` should be a `BlockArg` that selects between two
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// values. `cond_id` is the condition, `if_false` is the value to use if the
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// condition is false, and `if_true` is the value to use if the condition is
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// true. We don't track enough information in the `BlockArg` inst for
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// `TryEvalInst` to do this itself.
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auto SetBlockArgResultBeforeConstantUse(Context& context,
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SemIR::InstId select_id,
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SemIR::InstId cond_id,
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SemIR::InstId if_true,
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SemIR::InstId if_false) -> void;
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// Returns whether the current position in the current block is reachable.
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auto IsCurrentPositionReachable(Context& context) -> bool;
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} // namespace Carbon::Check
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#endif // CARBON_TOOLCHAIN_CHECK_CONTROL_FLOW_H_
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