retdec
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Removes dead code. Examples are mentioned below. More...
#include <dead_code_optimizer.h>
Public Member Functions | |
DeadCodeOptimizer (ShPtr< Module > module, ShPtr< ArithmExprEvaluator > arithmExprEvaluator) | |
Constructs a new optimizer. More... | |
virtual std::string | getId () const override |
Returns the ID of the optimizer. More... | |
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Optimizer (ShPtr< Module > module) | |
Constructs a new optimizer. More... | |
ShPtr< Module > | optimize () |
Performs all the optimizations of the specific optimizer. More... | |
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virtual void | visit (ShPtr< GlobalVarDef > varDef) override |
virtual void | visit (ShPtr< Function > func) override |
virtual void | visit (ShPtr< AssignStmt > stmt) override |
virtual void | visit (ShPtr< BreakStmt > stmt) override |
virtual void | visit (ShPtr< CallStmt > stmt) override |
virtual void | visit (ShPtr< ContinueStmt > stmt) override |
virtual void | visit (ShPtr< EmptyStmt > stmt) override |
virtual void | visit (ShPtr< UForLoopStmt > stmt) override |
virtual void | visit (ShPtr< GotoStmt > stmt) override |
virtual void | visit (ShPtr< ReturnStmt > stmt) override |
virtual void | visit (ShPtr< UnreachableStmt > stmt) override |
virtual void | visit (ShPtr< VarDefStmt > stmt) override |
virtual void | visit (ShPtr< AddOpExpr > expr) override |
virtual void | visit (ShPtr< AddressOpExpr > expr) override |
virtual void | visit (ShPtr< AndOpExpr > expr) override |
virtual void | visit (ShPtr< ArrayIndexOpExpr > expr) override |
virtual void | visit (ShPtr< AssignOpExpr > expr) override |
virtual void | visit (ShPtr< BitAndOpExpr > expr) override |
virtual void | visit (ShPtr< BitOrOpExpr > expr) override |
virtual void | visit (ShPtr< BitShlOpExpr > expr) override |
virtual void | visit (ShPtr< BitShrOpExpr > expr) override |
virtual void | visit (ShPtr< BitXorOpExpr > expr) override |
virtual void | visit (ShPtr< CallExpr > expr) override |
virtual void | visit (ShPtr< CommaOpExpr > expr) override |
virtual void | visit (ShPtr< DerefOpExpr > expr) override |
virtual void | visit (ShPtr< DivOpExpr > expr) override |
virtual void | visit (ShPtr< EqOpExpr > expr) override |
virtual void | visit (ShPtr< GtEqOpExpr > expr) override |
virtual void | visit (ShPtr< GtOpExpr > expr) override |
virtual void | visit (ShPtr< LtEqOpExpr > expr) override |
virtual void | visit (ShPtr< LtOpExpr > expr) override |
virtual void | visit (ShPtr< ModOpExpr > expr) override |
virtual void | visit (ShPtr< MulOpExpr > expr) override |
virtual void | visit (ShPtr< NegOpExpr > expr) override |
virtual void | visit (ShPtr< NeqOpExpr > expr) override |
virtual void | visit (ShPtr< NotOpExpr > expr) override |
virtual void | visit (ShPtr< OrOpExpr > expr) override |
virtual void | visit (ShPtr< StructIndexOpExpr > expr) override |
virtual void | visit (ShPtr< SubOpExpr > expr) override |
virtual void | visit (ShPtr< TernaryOpExpr > expr) override |
virtual void | visit (ShPtr< Variable > var) override |
virtual void | visit (ShPtr< BitCastExpr > expr) override |
virtual void | visit (ShPtr< ExtCastExpr > expr) override |
virtual void | visit (ShPtr< FPToIntCastExpr > expr) override |
virtual void | visit (ShPtr< IntToFPCastExpr > expr) override |
virtual void | visit (ShPtr< IntToPtrCastExpr > expr) override |
virtual void | visit (ShPtr< PtrToIntCastExpr > expr) override |
virtual void | visit (ShPtr< TruncCastExpr > expr) override |
virtual void | visit (ShPtr< ConstArray > constant) override |
virtual void | visit (ShPtr< ConstBool > constant) override |
virtual void | visit (ShPtr< ConstFloat > constant) override |
virtual void | visit (ShPtr< ConstInt > constant) override |
virtual void | visit (ShPtr< ConstNullPointer > constant) override |
virtual void | visit (ShPtr< ConstString > constant) override |
virtual void | visit (ShPtr< ConstStruct > constant) override |
virtual void | visit (ShPtr< ConstSymbol > constant) override |
virtual void | visit (ShPtr< ArrayType > type) override |
virtual void | visit (ShPtr< FloatType > type) override |
virtual void | visit (ShPtr< IntType > type) override |
virtual void | visit (ShPtr< PointerType > type) override |
virtual void | visit (ShPtr< StringType > type) override |
virtual void | visit (ShPtr< StructType > type) override |
virtual void | visit (ShPtr< FunctionType > type) override |
virtual void | visit (ShPtr< VoidType > type) override |
virtual void | visit (ShPtr< UnknownType > type) override |
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virtual | ~Visitor ()=default |
Private Member Functions | |
SwitchStmt::clause_iterator | findClauseWithCondEqualToControlExpr (ShPtr< SwitchStmt > stmt, ShPtr< Constant > controlExpr) |
Try to find the first clause with condition that is equal to control expression. More... | |
IfStmt::clause_iterator | findTrueClause (ShPtr< IfStmt > stmt) |
Find first true clause in stmt and return it. More... | |
bool | hasBreakContinueReturnInAllClausesAsLastStmt (ShPtr< SwitchStmt > stmt) |
Find if all clauses in stmt have break, continue, return statement at last statement. More... | |
void | optimizeBecauseTrueClauseIsPresent (ShPtr< IfStmt > stmt, IfStmt::clause_iterator trueClause) |
Optimize stmt when one of clauses was evaluated as true . More... | |
void | optimizeSwitchStmt (ShPtr< SwitchStmt > stmt, SwitchStmt::clause_iterator resultClause) |
Optimize stmt. More... | |
void | removeFalseClausesWithoutGotoLabel (ShPtr< IfStmt > stmt) |
Removes if, else-if clauses with evaluated condition as false. Clause can be removed if doesn't have goto label. More... | |
void | correctIfStmtDueToPresenceOfFalseClauses (ShPtr< IfStmt > stmt) |
Make correctness on stmt in special cases. More... | |
void | tryToOptimizeForLoopStmt (ShPtr< ForLoopStmt > stmt) |
Try to optimize ForLoopStmt . More... | |
void | tryToOptimizeIfStmt (ShPtr< IfStmt > stmt) |
Try to optimize stmt. More... | |
void | tryToOptimizeSwitchStmt (ShPtr< SwitchStmt > stmt) |
Try to optimize SwitchStmt . More... | |
void | tryToOptimizeWhileLoopStmt (ShPtr< WhileLoopStmt > stmt) |
Try to optimize WhileLoopStmt . More... | |
Visitor Interface | |
virtual void | visit (ShPtr< IfStmt > stmt) override |
virtual void | visit (ShPtr< SwitchStmt > stmt) override |
virtual void | visit (ShPtr< ForLoopStmt > stmt) override |
virtual void | visit (ShPtr< WhileLoopStmt > stmt) override |
virtual void | visit (ShPtr< GlobalVarDef > varDef) override |
virtual void | visit (ShPtr< Function > func) override |
virtual void | visit (ShPtr< AssignStmt > stmt) override |
virtual void | visit (ShPtr< BreakStmt > stmt) override |
virtual void | visit (ShPtr< CallStmt > stmt) override |
virtual void | visit (ShPtr< ContinueStmt > stmt) override |
virtual void | visit (ShPtr< EmptyStmt > stmt) override |
virtual void | visit (ShPtr< ForLoopStmt > stmt) override |
virtual void | visit (ShPtr< UForLoopStmt > stmt) override |
virtual void | visit (ShPtr< GotoStmt > stmt) override |
virtual void | visit (ShPtr< IfStmt > stmt) override |
virtual void | visit (ShPtr< ReturnStmt > stmt) override |
virtual void | visit (ShPtr< SwitchStmt > stmt) override |
virtual void | visit (ShPtr< UnreachableStmt > stmt) override |
virtual void | visit (ShPtr< VarDefStmt > stmt) override |
virtual void | visit (ShPtr< WhileLoopStmt > stmt) override |
virtual void | visit (ShPtr< AddOpExpr > expr) override |
virtual void | visit (ShPtr< AddressOpExpr > expr) override |
virtual void | visit (ShPtr< AndOpExpr > expr) override |
virtual void | visit (ShPtr< ArrayIndexOpExpr > expr) override |
virtual void | visit (ShPtr< AssignOpExpr > expr) override |
virtual void | visit (ShPtr< BitAndOpExpr > expr) override |
virtual void | visit (ShPtr< BitOrOpExpr > expr) override |
virtual void | visit (ShPtr< BitShlOpExpr > expr) override |
virtual void | visit (ShPtr< BitShrOpExpr > expr) override |
virtual void | visit (ShPtr< BitXorOpExpr > expr) override |
virtual void | visit (ShPtr< CallExpr > expr) override |
virtual void | visit (ShPtr< CommaOpExpr > expr) override |
virtual void | visit (ShPtr< DerefOpExpr > expr) override |
virtual void | visit (ShPtr< DivOpExpr > expr) override |
virtual void | visit (ShPtr< EqOpExpr > expr) override |
virtual void | visit (ShPtr< GtEqOpExpr > expr) override |
virtual void | visit (ShPtr< GtOpExpr > expr) override |
virtual void | visit (ShPtr< LtEqOpExpr > expr) override |
virtual void | visit (ShPtr< LtOpExpr > expr) override |
virtual void | visit (ShPtr< ModOpExpr > expr) override |
virtual void | visit (ShPtr< MulOpExpr > expr) override |
virtual void | visit (ShPtr< NegOpExpr > expr) override |
virtual void | visit (ShPtr< NeqOpExpr > expr) override |
virtual void | visit (ShPtr< NotOpExpr > expr) override |
virtual void | visit (ShPtr< OrOpExpr > expr) override |
virtual void | visit (ShPtr< StructIndexOpExpr > expr) override |
virtual void | visit (ShPtr< SubOpExpr > expr) override |
virtual void | visit (ShPtr< TernaryOpExpr > expr) override |
virtual void | visit (ShPtr< Variable > var) override |
virtual void | visit (ShPtr< BitCastExpr > expr) override |
virtual void | visit (ShPtr< ExtCastExpr > expr) override |
virtual void | visit (ShPtr< FPToIntCastExpr > expr) override |
virtual void | visit (ShPtr< IntToFPCastExpr > expr) override |
virtual void | visit (ShPtr< IntToPtrCastExpr > expr) override |
virtual void | visit (ShPtr< PtrToIntCastExpr > expr) override |
virtual void | visit (ShPtr< TruncCastExpr > expr) override |
virtual void | visit (ShPtr< ConstArray > constant) override |
virtual void | visit (ShPtr< ConstBool > constant) override |
virtual void | visit (ShPtr< ConstFloat > constant) override |
virtual void | visit (ShPtr< ConstInt > constant) override |
virtual void | visit (ShPtr< ConstNullPointer > constant) override |
virtual void | visit (ShPtr< ConstString > constant) override |
virtual void | visit (ShPtr< ConstStruct > constant) override |
virtual void | visit (ShPtr< ConstSymbol > constant) override |
virtual void | visit (ShPtr< ArrayType > type) override |
virtual void | visit (ShPtr< FloatType > type) override |
virtual void | visit (ShPtr< IntType > type) override |
virtual void | visit (ShPtr< PointerType > type) override |
virtual void | visit (ShPtr< StringType > type) override |
virtual void | visit (ShPtr< StructType > type) override |
virtual void | visit (ShPtr< FunctionType > type) override |
virtual void | visit (ShPtr< VoidType > type) override |
virtual void | visit (ShPtr< UnknownType > type) override |
Private Attributes | |
ShPtr< ArithmExprEvaluator > | arithmExprEvaluator |
The used evaluator of arithmetical expressions. More... | |
Additional Inherited Members | |
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template<class OptimizerType , typename... Args> | |
static ShPtr< Module > | optimize (ShPtr< Module > module, Args &&... args) |
Creates an instance of OptimizerType with the given arguments and optimizes the given module by it. More... | |
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FuncOptimizer (ShPtr< Module > module) | |
Constructs a new function optimizer. More... | |
virtual void | doOptimization () override |
Performs the optimization on all functions in the module. More... | |
virtual void | runOnFunction (ShPtr< Function > func) |
Performs all optimizations on the given function. More... | |
template<typename T > | |
void | visitNestedAndSuccessorStatements (ShPtr< T > stmt) |
Visits the given statement, its nested statements, and successor statements (depending on the settings of the visitor). More... | |
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virtual void | doInitialization () |
Performs pre-optimization matters. More... | |
virtual void | doFinalization () |
Performs post-optimization matters. More... | |
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OrderedAllVisitor (bool visitSuccessors=true, bool visitNestedStmts=true) | |
Constructs a new visitor. More... | |
virtual void | visitStmt (ShPtr< Statement > stmt, bool visitSuccessors=true, bool visitNestedStmts=true) |
Visits the given statement, and possibly its successors or nested statements. More... | |
void | restart (bool visitSuccessors=true, bool visitNestedStmts=true) |
"Restarts" the visitor so it is in the state like it was when it was created. More... | |
bool | makeAccessedAndCheckIfAccessed (ShPtr< Type > type) |
Makes the given type accessed. More... | |
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Visitor ()=default | |
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ShPtr< Function > | currFunc |
Function that is currently being optimized. More... | |
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ShPtr< Module > | module |
The module that is being optimized. More... | |
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ShPtr< Statement > | lastStmt |
Statement that has been accessed as the last one. More... | |
StmtUSet | accessedStmts |
A set of all accessed statements. More... | |
TypeUSet | accessedTypes |
A set of all accessed types. More... | |
bool | visitSuccessors |
Should statements' successor be accessed? More... | |
bool | visitNestedStmts |
Should nested statements be accessed? More... | |
Removes dead code. Examples are mentioned below.
Instances of this class have reference object semantics.
This is a concrete optimizer which should not be subclassed.
retdec::llvmir2hll::DeadCodeOptimizer::DeadCodeOptimizer | ( | ShPtr< Module > | module, |
ShPtr< ArithmExprEvaluator > | arithmExprEvaluator | ||
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Constructs a new optimizer.
[in] | module | Module to be optimized. |
[in] | arithmExprEvaluator | The used evaluator of arithmetical expressions. |
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Make correctness on stmt in special cases.
Due to removing false clauses we can get if statement without first if condition and body. We need to make correctness. For Example:
To:
[in] | stmt | Statement on which are made correctness. |
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Try to find the first clause with condition that is equal to control expression.
[in] | stmt | Statement to analyse. |
[in] | controlExpr | Control expression of stmt. |
clause_end()
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Find first true clause in stmt and return it.
[in] | stmt | Statement where is true clause searched. |
clause_end()
.
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Returns the ID of the optimizer.
Implements retdec::llvmir2hll::Optimizer.
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Find if all clauses in stmt have break, continue, return statement at last statement.
[in] | stmt | Statement to analyse. |
true
if all clauses in stmt have break, continue, return statement at last statement, otherwise false
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Optimize stmt when one of clauses was evaluated as true
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[in] | stmt | Statement to optimize. |
[in] | trueClause | First true clause. |
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Optimize stmt.
[in] | stmt | Statement to optimize. |
[in] | resultClause | Clause that has equal evaluated condition as control expression. |
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Removes if, else-if clauses with evaluated condition as false. Clause can be removed if doesn't have goto label.
[in] | stmt | Statement from which are removed false clause. |
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Try to optimize ForLoopStmt
.
Optimization is possible when end condition in for is evaluated as false and body of stmt doesn't have goto label.
[in] | stmt | ForLoopStmt to optimize. |
Try to optimize stmt.
[in] | stmt | Statement to optimize. |
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Try to optimize SwitchStmt
.
Optimization is possible when all clauses have break, continue or return statement at last statement. Also is need to have clause with condition which is equal to control expression after evaluation.
[in] | stmt | SwitchStmt to optimize. |
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Try to optimize WhileLoopStmt
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Optimization is possible when condition in while is evaluated as false and body of stmt doesn't have goto label.
[in] | stmt | WhileLoopStmt to optimize. |
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The used evaluator of arithmetical expressions.