mirror of
https://github.com/RGBCube/serenity
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1bd52ce789
Now that JS function objects are JS::FunctionObject, we can stop qualifying AK::Function and just say "Function" everywhere. Nice. :^)
54 lines
1.5 KiB
C++
54 lines
1.5 KiB
C++
/*
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* Copyright (c) 2021, Ali Mohammad Pur <mpfard@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <LibJS/Bytecode/PassManager.h>
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namespace JS::Bytecode::Passes {
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void PlaceBlocks::perform(PassPipelineExecutable& executable)
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{
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started();
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VERIFY(executable.cfg.has_value());
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auto cfg = executable.cfg.release_value();
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Vector<BasicBlock&> replaced_blocks;
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HashTable<BasicBlock const*> reachable_blocks;
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// Visit the blocks in CFG order
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Function<void(BasicBlock const*)> visit = [&](auto* block) {
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if (reachable_blocks.contains(block))
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return;
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reachable_blocks.set(block);
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replaced_blocks.append(*const_cast<BasicBlock*>(block));
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for (auto& entry : cfg.get(block).value_or({}))
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visit(entry);
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};
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// Make sure to visit the entry block first
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visit(&executable.executable.basic_blocks.first());
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for (auto& entry : cfg)
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visit(entry.key);
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// Put the unreferenced blocks back in at the end
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for (auto& entry : static_cast<Vector<NonnullOwnPtr<BasicBlock>>&>(executable.executable.basic_blocks)) {
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if (reachable_blocks.contains(entry.ptr()))
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(void)entry.leak_ptr();
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else
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replaced_blocks.append(*entry.leak_ptr()); // Don't try to do DCE here.
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}
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executable.executable.basic_blocks.clear();
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for (auto& block : replaced_blocks)
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executable.executable.basic_blocks.append(adopt_own(block));
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finished();
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}
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}
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