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LibJS: Add a basic pass manager and add some basic passes

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This commit adds a bunch of passes, the most interesting of which is a
pass that merges blocks together, and a pass that places blocks that
flow into each other next to each other, and a very simply pass that
removes duplicate basic blocks.
Note that this does not remove the jump at the end of each block in that
pass to avoid scope creep in the passes.
This commit is contained in:
Ali Mohammad Pur
2021-06-13 20:40:20 +04:30
committed by Ali Mohammad Pur
parent e81fd7106b
commit 1414c7b049
17 changed files with 751 additions and 30 deletions
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34
Userland/Libraries/LibJS/Bytecode/Interpreter.cpp
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@@ -165,4 +165,38 @@ void Interpreter::continue_pending_unwind(Label const& resume_label)
jump(resume_label);
}
}
AK::Array<OwnPtr<PassManager>, static_cast<UnderlyingType<Interpreter::OptimizationLevel>>(Interpreter::OptimizationLevel::__Count)> Interpreter::s_optimization_pipelines {};
Bytecode::PassManager& Interpreter::optimization_pipeline(Interpreter::OptimizationLevel level)
{
auto underlying_level = to_underlying(level);
VERIFY(underlying_level <= to_underlying(Interpreter::OptimizationLevel::__Count));
auto& entry = s_optimization_pipelines[underlying_level];
if (entry)
return *entry;
auto pm = make<PassManager>();
if (level == OptimizationLevel::Default) {
pm->add<Passes::GenerateCFG>();
pm->add<Passes::UnifySameBlocks>();
pm->add<Passes::GenerateCFG>();
pm->add<Passes::MergeBlocks>();
pm->add<Passes::GenerateCFG>();
pm->add<Passes::UnifySameBlocks>();
pm->add<Passes::GenerateCFG>();
pm->add<Passes::MergeBlocks>();
pm->add<Passes::GenerateCFG>();
pm->add<Passes::PlaceBlocks>();
} else {
VERIFY_NOT_REACHED();
}
auto& passes = *pm;
entry = move(pm);
return passes;
}
}