| // Copyright 2024 The Dawn & Tint Authors |
| // |
| // Redistribution and use in source and binary forms, with or without |
| // modification, are permitted provided that the following conditions are met: |
| // |
| // 1. Redistributions of source code must retain the above copyright notice, this |
| // list of conditions and the following disclaimer. |
| // |
| // 2. Redistributions in binary form must reproduce the above copyright notice, |
| // this list of conditions and the following disclaimer in the documentation |
| // and/or other materials provided with the distribution. |
| // |
| // 3. Neither the name of the copyright holder nor the names of its |
| // contributors may be used to endorse or promote products derived from |
| // this software without specific prior written permission. |
| // |
| // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
| // AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| // IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
| // DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE |
| // FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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| // SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER |
| // CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
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| // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| |
| #include "src/tint/lang/core/ir/transform/common/referenced_module_vars.h" |
| |
| #include "src/tint/lang/core/ir/control_instruction.h" |
| #include "src/tint/lang/core/ir/module.h" |
| #include "src/tint/lang/core/ir/user_call.h" |
| #include "src/tint/lang/core/ir/var.h" |
| #include "src/tint/utils/rtti/switch.h" |
| |
| namespace tint::core::ir { |
| |
| const ReferencedModuleVars::VarSet& ReferencedModuleVars::TransitiveReferences(Function* func) { |
| return transitive_references_.GetOrAdd(func, [&] { |
| VarSet vars; |
| GetTransitiveReferences(func->Block(), vars); |
| return vars; |
| }); |
| } |
| |
| /// Get the set of variables transitively referenced by @p block. |
| /// @param block the block |
| /// @param vars the set of transitively referenced variables to populate |
| void ReferencedModuleVars::GetTransitiveReferences(Block* block, VarSet& vars) { |
| // Add directly referenced vars. |
| if (auto itr = block_to_direct_vars_.Get(block)) { |
| for (auto& var : *itr) { |
| vars.Add(var); |
| } |
| } |
| |
| // Loop over instructions in the block to find indirectly referenced vars. |
| for (auto* inst : *block) { |
| tint::Switch( |
| inst, |
| [&](UserCall* call) { |
| // Get variables referenced by a function called from this block. |
| const auto& callee_vars = TransitiveReferences(call->Target()); |
| for (auto* var : callee_vars) { |
| vars.Add(var); |
| } |
| }, |
| [&](ControlInstruction* ctrl) { |
| // Recurse into control instructions and gather their referenced vars. |
| ctrl->ForeachBlock([&](Block* blk) { GetTransitiveReferences(blk, vars); }); |
| }); |
| } |
| } |
| |
| } // namespace tint::core::ir |