mirror of
https://github.com/ethereum/solidity
synced 2023-10-03 13:03:40 +00:00
240 lines
7.5 KiB
C++
240 lines
7.5 KiB
C++
/*
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This file is part of solidity.
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solidity is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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solidity is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with solidity. If not, see <http://www.gnu.org/licenses/>.
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*/
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/**
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* Optimiser suite that combines all steps and also provides the settings for the heuristics.
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*/
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#include <libyul/optimiser/Suite.h>
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#include <libyul/optimiser/Disambiguator.h>
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#include <libyul/optimiser/VarDeclInitializer.h>
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#include <libyul/optimiser/BlockFlattener.h>
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#include <libyul/optimiser/ControlFlowSimplifier.h>
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#include <libyul/optimiser/DeadCodeEliminator.h>
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#include <libyul/optimiser/FunctionGrouper.h>
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#include <libyul/optimiser/FunctionHoister.h>
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#include <libyul/optimiser/EquivalentFunctionCombiner.h>
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#include <libyul/optimiser/ExpressionSplitter.h>
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#include <libyul/optimiser/ExpressionJoiner.h>
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#include <libyul/optimiser/ExpressionInliner.h>
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#include <libyul/optimiser/FullInliner.h>
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#include <libyul/optimiser/ForLoopInitRewriter.h>
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#include <libyul/optimiser/Rematerialiser.h>
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#include <libyul/optimiser/UnusedPruner.h>
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#include <libyul/optimiser/ExpressionSimplifier.h>
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#include <libyul/optimiser/CommonSubexpressionEliminator.h>
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#include <libyul/optimiser/SSAReverser.h>
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#include <libyul/optimiser/SSATransform.h>
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#include <libyul/optimiser/StackCompressor.h>
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#include <libyul/optimiser/StructuralSimplifier.h>
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#include <libyul/optimiser/RedundantAssignEliminator.h>
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#include <libyul/optimiser/VarNameCleaner.h>
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#include <libyul/optimiser/Metrics.h>
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#include <libyul/backends/evm/ConstantOptimiser.h>
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#include <libyul/AsmAnalysis.h>
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#include <libyul/AsmAnalysisInfo.h>
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#include <libyul/AsmData.h>
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#include <libyul/AsmPrinter.h>
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#include <libyul/Object.h>
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#include <libyul/backends/wasm/WasmDialect.h>
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#include <libyul/backends/evm/NoOutputAssembly.h>
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#include <libdevcore/CommonData.h>
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using namespace std;
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using namespace dev;
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using namespace yul;
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void OptimiserSuite::run(
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Dialect const& _dialect,
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GasMeter const* _meter,
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Object& _object,
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bool _optimizeStackAllocation,
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set<YulString> const& _externallyUsedIdentifiers
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)
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{
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set<YulString> reservedIdentifiers = _externallyUsedIdentifiers;
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reservedIdentifiers += _dialect.fixedFunctionNames();
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*_object.code = boost::get<Block>(Disambiguator(
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_dialect,
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*_object.analysisInfo,
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reservedIdentifiers
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)(*_object.code));
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Block& ast = *_object.code;
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VarDeclInitializer{}(ast);
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FunctionHoister{}(ast);
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BlockFlattener{}(ast);
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ForLoopInitRewriter{}(ast);
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DeadCodeEliminator{_dialect}(ast);
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FunctionGrouper{}(ast);
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EquivalentFunctionCombiner::run(ast);
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UnusedPruner::runUntilStabilised(_dialect, ast, reservedIdentifiers);
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BlockFlattener{}(ast);
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ControlFlowSimplifier{_dialect}(ast);
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StructuralSimplifier{_dialect}(ast);
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ControlFlowSimplifier{_dialect}(ast);
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BlockFlattener{}(ast);
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// None of the above can make stack problems worse.
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NameDispenser dispenser{_dialect, ast, reservedIdentifiers};
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size_t codeSize = 0;
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for (size_t rounds = 0; rounds < 12; ++rounds)
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{
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{
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size_t newSize = CodeSize::codeSizeIncludingFunctions(ast);
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if (newSize == codeSize)
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break;
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codeSize = newSize;
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}
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{
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// Turn into SSA and simplify
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ExpressionSplitter{_dialect, dispenser}(ast);
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SSATransform::run(ast, dispenser);
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RedundantAssignEliminator::run(_dialect, ast);
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RedundantAssignEliminator::run(_dialect, ast);
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ExpressionSimplifier::run(_dialect, ast);
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CommonSubexpressionEliminator{_dialect}(ast);
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}
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{
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// still in SSA, perform structural simplification
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ControlFlowSimplifier{_dialect}(ast);
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StructuralSimplifier{_dialect}(ast);
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ControlFlowSimplifier{_dialect}(ast);
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BlockFlattener{}(ast);
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DeadCodeEliminator{_dialect}(ast);
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UnusedPruner::runUntilStabilised(_dialect, ast, reservedIdentifiers);
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}
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{
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// simplify again
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CommonSubexpressionEliminator{_dialect}(ast);
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UnusedPruner::runUntilStabilised(_dialect, ast, reservedIdentifiers);
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}
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{
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// reverse SSA
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SSAReverser::run(ast);
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CommonSubexpressionEliminator{_dialect}(ast);
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UnusedPruner::runUntilStabilised(_dialect, ast, reservedIdentifiers);
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ExpressionJoiner::run(ast);
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ExpressionJoiner::run(ast);
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}
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// should have good "compilability" property here.
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{
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// run functional expression inliner
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ExpressionInliner(_dialect, ast).run();
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UnusedPruner::runUntilStabilised(_dialect, ast, reservedIdentifiers);
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}
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{
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// Turn into SSA again and simplify
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ExpressionSplitter{_dialect, dispenser}(ast);
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SSATransform::run(ast, dispenser);
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RedundantAssignEliminator::run(_dialect, ast);
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RedundantAssignEliminator::run(_dialect, ast);
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CommonSubexpressionEliminator{_dialect}(ast);
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}
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{
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// run full inliner
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FunctionGrouper{}(ast);
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EquivalentFunctionCombiner::run(ast);
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FullInliner{ast, dispenser}.run();
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BlockFlattener{}(ast);
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}
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{
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// SSA plus simplify
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SSATransform::run(ast, dispenser);
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RedundantAssignEliminator::run(_dialect, ast);
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RedundantAssignEliminator::run(_dialect, ast);
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ExpressionSimplifier::run(_dialect, ast);
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StructuralSimplifier{_dialect}(ast);
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BlockFlattener{}(ast);
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DeadCodeEliminator{_dialect}(ast);
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ControlFlowSimplifier{_dialect}(ast);
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CommonSubexpressionEliminator{_dialect}(ast);
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SSATransform::run(ast, dispenser);
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RedundantAssignEliminator::run(_dialect, ast);
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RedundantAssignEliminator::run(_dialect, ast);
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UnusedPruner::runUntilStabilised(_dialect, ast, reservedIdentifiers);
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CommonSubexpressionEliminator{_dialect}(ast);
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}
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}
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// Make source short and pretty.
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ExpressionJoiner::run(ast);
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Rematerialiser::run(_dialect, ast);
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UnusedPruner::runUntilStabilised(_dialect, ast, reservedIdentifiers);
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ExpressionJoiner::run(ast);
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UnusedPruner::runUntilStabilised(_dialect, ast, reservedIdentifiers);
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ExpressionJoiner::run(ast);
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UnusedPruner::runUntilStabilised(_dialect, ast, reservedIdentifiers);
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SSAReverser::run(ast);
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CommonSubexpressionEliminator{_dialect}(ast);
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UnusedPruner::runUntilStabilised(_dialect, ast, reservedIdentifiers);
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ExpressionJoiner::run(ast);
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Rematerialiser::run(_dialect, ast);
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UnusedPruner::runUntilStabilised(_dialect, ast, reservedIdentifiers);
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// This is a tuning parameter, but actually just prevents infinite loops.
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size_t stackCompressorMaxIterations = 16;
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FunctionGrouper{}(ast);
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// We ignore the return value because we will get a much better error
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// message once we perform code generation.
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StackCompressor::run(
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_dialect,
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_object,
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_optimizeStackAllocation,
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stackCompressorMaxIterations
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);
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BlockFlattener{}(ast);
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DeadCodeEliminator{_dialect}(ast);
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ControlFlowSimplifier{_dialect}(ast);
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FunctionGrouper{}(ast);
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if (EVMDialect const* dialect = dynamic_cast<EVMDialect const*>(&_dialect))
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{
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yulAssert(_meter, "");
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ConstantOptimiser{*dialect, *_meter}(ast);
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}
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else if (dynamic_cast<WasmDialect const*>(&_dialect))
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{
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// If the first statement is an empty block, remove it.
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// We should only have function definitions after that.
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if (ast.statements.size() > 1 && boost::get<Block>(ast.statements.front()).statements.empty())
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ast.statements.erase(ast.statements.begin());
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}
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VarNameCleaner{ast, _dialect, reservedIdentifiers}(ast);
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*_object.analysisInfo = AsmAnalyzer::analyzeStrictAssertCorrect(_dialect, _object);
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}
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