retdec
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Optimizes while loops into for loops. More...
#include <while_true_to_for_loop_optimizer.h>
Public Member Functions | |
WhileTrueToForLoopOptimizer (ShPtr< Module > module, ShPtr< ValueAnalysis > va, 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< 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< 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 | |
virtual void | doOptimization () override |
Performs the optimization on all functions in the module. More... | |
ShPtr< Expression > | computeStartValueOfForLoop (ShPtr< IndVarInfo > indVarInfo) const |
Returns the start value of the resulting for loop. More... | |
ShPtr< Expression > | computeStepOfForLoop (ShPtr< IndVarInfo > indVarInfo) const |
Returns the step of the resulting for loop. More... | |
ShPtr< Expression > | computeEndCondOfForLoop (ShPtr< IndVarInfo > indVarInfo, ShPtr< Expression > startValue, ShPtr< Expression > step) const |
Returns the end condition of the resulting for loop. More... | |
ShPtr< ConstInt > | evaluate (ShPtr< Expression > expr) const |
Tries to evaluate the given arithmetical expression and returns the resulting value. More... | |
Visitor Interface | |
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 |
Static Private Member Functions | |
static ShPtr< BinaryOpExpr > | exchangeCompOpAndOperands (ShPtr< BinaryOpExpr > expr) |
Exchanges the operation and operands in the given binary comparison expression. More... | |
static bool | isNonNegative (ShPtr< Expression > expr) |
Returns true if the given expression represents a non-negative value, false otherwise. More... | |
static bool | isPositive (ShPtr< Expression > expr) |
Returns true if the given expression represents a positive value, false otherwise. More... | |
Private Attributes | |
ShPtr< ValueAnalysis > | va |
Analysis of values. More... | |
ShPtr< ArithmExprEvaluator > | arithmExprEvaluator |
Evaluator of 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 | 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... | |
Optimizes while loops into for loops.
For example, the following loop
can be optimized into
Prerequisities:
Instances of this class have reference object semantics.
This is a concrete optimizer which should not be subclassed.
retdec::llvmir2hll::WhileTrueToForLoopOptimizer::WhileTrueToForLoopOptimizer | ( | ShPtr< Module > | module, |
ShPtr< ValueAnalysis > | va, | ||
ShPtr< ArithmExprEvaluator > | arithmExprEvaluator | ||
) |
Constructs a new optimizer.
[in] | module | Module to be optimized. |
[in] | va | Analysis of values. |
[in] | arithmExprEvaluator | Evaluator of expressions. |
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Returns the end condition of the resulting for loop.
If the end condition cannot be computed, the null pointer is returned.
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Returns the start value of the resulting for loop.
If the start value cannot be computed, the null pointer is returned.
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Returns the step of the resulting for loop.
If the step cannot be computed, the null pointer is returned.
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overrideprivatevirtual |
Performs the optimization on all functions in the module.
This function calls runOnFunction() for each function in the module.
Only redefine if you want to prescribe the order in which functions are optimized; otherwise, just override runOnFunction().
Reimplemented from retdec::llvmir2hll::FuncOptimizer.
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Tries to evaluate the given arithmetical expression and returns the resulting value.
If the expression cannot be evaluated, the null pointer is returned.
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staticprivate |
Exchanges the operation and operands in the given binary comparison expression.
For example, i < j
is converted into j > i
.
The original expression is not modified.
If the operation is is not comparison, it returns the null pointer.
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inlineoverridevirtual |
Returns the ID of the optimizer.
Implements retdec::llvmir2hll::Optimizer.
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Returns true
if the given expression represents a non-negative value, false
otherwise.
If the non-negativeness of expr cannot be determined, this function returns false
.
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Returns true
if the given expression represents a positive value, false
otherwise.
If the positiveness of expr cannot be determined, this function returns false
.
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Reimplemented from retdec::llvmir2hll::OrderedAllVisitor.
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Evaluator of expressions.
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Analysis of values.