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retdec::llvmir2hll::ConstOperatorConstSubOptimizer Class Referencefinal

This optimizer optimizes expressions where the first and the second operand is a constant. Examples are mentioned below. More...

#include <const_operator_const_sub_optimizer.h>

Inheritance diagram for retdec::llvmir2hll::ConstOperatorConstSubOptimizer:
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Collaboration diagram for retdec::llvmir2hll::ConstOperatorConstSubOptimizer:
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Public Member Functions

 ConstOperatorConstSubOptimizer (ShPtr< ArithmExprEvaluator > arithmExprEvaluator)
 Constructs the ConstOperatorConstSubOptimizer. More...
 
virtual std::string getId () const override
 Returns the ID of the optimizer. More...
 
- Public Member Functions inherited from retdec::llvmir2hll::SubOptimizer
virtual bool tryOptimize (ShPtr< Expression > expr)
 Run optimization and try to optimize. More...
 
- Public Member Functions inherited from retdec::llvmir2hll::OrderedAllVisitor
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< AddressOpExpr > expr) override
 
virtual void visit (ShPtr< ArrayIndexOpExpr > expr) override
 
virtual void visit (ShPtr< AssignOpExpr > expr) override
 
virtual void visit (ShPtr< BitShlOpExpr > expr) override
 
virtual void visit (ShPtr< BitShrOpExpr > 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< ModOpExpr > expr) override
 
virtual void visit (ShPtr< NegOpExpr > expr) override
 
virtual void visit (ShPtr< NotOpExpr > expr) override
 
virtual void visit (ShPtr< StructIndexOpExpr > 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
 
- Public Member Functions inherited from retdec::llvmir2hll::Visitor
virtual ~Visitor ()=default
 

Static Public Member Functions

static ShPtr< SubOptimizercreate (ShPtr< ArithmExprEvaluator > arithmExprEvaluator)
 Creates a new ConstOperatorConstSubOptimizer. More...
 

Private Member Functions

void tryOptimizeConstConstOperand (ShPtr< BinaryOpExpr > expr)
 Try to optimize expression like ConstInt/ConstFloat operator ConstInt/ConstFloat. More...
 
Visitor Interface
virtual void visit (ShPtr< AddOpExpr > expr) override
 
virtual void visit (ShPtr< SubOpExpr > expr) override
 
virtual void visit (ShPtr< MulOpExpr > expr) override
 
virtual void visit (ShPtr< DivOpExpr > expr) override
 
virtual void visit (ShPtr< BitAndOpExpr > expr) override
 
virtual void visit (ShPtr< BitOrOpExpr > expr) override
 
virtual void visit (ShPtr< BitXorOpExpr > expr) override
 
virtual void visit (ShPtr< LtOpExpr > expr) override
 
virtual void visit (ShPtr< LtEqOpExpr > expr) override
 
virtual void visit (ShPtr< GtOpExpr > expr) override
 
virtual void visit (ShPtr< GtEqOpExpr > expr) override
 
virtual void visit (ShPtr< EqOpExpr > expr) override
 
virtual void visit (ShPtr< NeqOpExpr > expr) override
 
virtual void visit (ShPtr< AndOpExpr > expr) override
 
virtual void visit (ShPtr< OrOpExpr > expr) override
 

Additional Inherited Members

- Protected Member Functions inherited from retdec::llvmir2hll::SubOptimizer
 SubOptimizer (ShPtr< ArithmExprEvaluator > arithmExprEvaluator)
 Constructs the SubOptimizer. More...
 
bool isConstFloatOrConstInt (ShPtr< Expression > expr) const
 Check if expression is a ConstInt or ConstFloat. More...
 
void optimizeExpr (ShPtr< Expression > oldExpr, ShPtr< Expression > newExpr)
 Optimize expression from oldExpr to newExpr. More...
 
bool tryOptimizeAndReturnIfCodeChanged (ShPtr< Expression > expr)
 Start traversal in abstract syntax tree. More...
 
- Protected Member Functions inherited from retdec::llvmir2hll::OrderedAllVisitor
 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...
 
- Protected Member Functions inherited from retdec::llvmir2hll::Visitor
 Visitor ()=default
 
- Protected Attributes inherited from retdec::llvmir2hll::SubOptimizer
ShPtr< ArithmExprEvaluatorarithmExprEvaluator
 The used evaluator of arithmetical expressions. More...
 
- Protected Attributes inherited from retdec::llvmir2hll::OrderedAllVisitor
ShPtr< StatementlastStmt
 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...
 

Detailed Description

This optimizer optimizes expressions where the first and the second operand is a constant. Examples are mentioned below.

Optimizations are now only on these operators: +, -, *, /, &, |, ^.

List of performed simplifications (by examples):

Operator +
(ConstInt/ConstFloat) + (ConstInt/ConstFloat).
return 2 + 5;
can be optimized to
return 7;
Operator &
ConstInt & ConstInt.
return 10 & 22;
can be optimized to
return 2;
Operator |
ConstInt | ConstInt.
return 10 | 22;
can be optimized to
return 30;
Operator ^
ConstInt ^ ConstInt.
return 10 ^ 22;
can be optimized to
return 28;
Operator -
(ConstInt/ConstFloat) - (ConstInt/ConstFloat).
return 2 - 5;
can be optimized to
return -3;
Operator *
(ConstInt/ConstFloat) * (ConstInt/ConstFloat).
return 2 * 5;
can be optimized to
return 10;
Operator /
(ConstInt/ConstFloat) / (ConstInt/ConstFloat).
return 10 / 5;
can be optimized to
return 2;
Operator <, >, <=, >=, ==, !, &&, ||
(ConstInt/ConstFloat/ConstBool) op (ConstInt/ConstFloat/ConstBool).
return 2 == 5;
can be optimized to
return false;

Instances of this class have reference object semantics.

This is a concrete sub-optimizer which should not be subclassed.

Constructor & Destructor Documentation

◆ ConstOperatorConstSubOptimizer()

retdec::llvmir2hll::ConstOperatorConstSubOptimizer::ConstOperatorConstSubOptimizer ( ShPtr< ArithmExprEvaluator arithmExprEvaluator)

Constructs the ConstOperatorConstSubOptimizer.

Parameters
[in]arithmExprEvaluatorThe used evaluator of arithmetical expressions.

Member Function Documentation

◆ create()

ShPtr< SubOptimizer > retdec::llvmir2hll::ConstOperatorConstSubOptimizer::create ( ShPtr< ArithmExprEvaluator arithmExprEvaluator)
static

Creates a new ConstOperatorConstSubOptimizer.

Parameters
[in]arithmExprEvaluatorThe used evaluator of arithmetical expressions.

◆ getId()

std::string retdec::llvmir2hll::ConstOperatorConstSubOptimizer::getId ( ) const
overridevirtual

Returns the ID of the optimizer.

Implements retdec::llvmir2hll::SubOptimizer.

◆ tryOptimizeConstConstOperand()

void retdec::llvmir2hll::ConstOperatorConstSubOptimizer::tryOptimizeConstConstOperand ( ShPtr< BinaryOpExpr expr)
private

Try to optimize expression like ConstInt/ConstFloat operator ConstInt/ConstFloat.

Parameters
[in]exprA BinaryOpExpr to optimize.

◆ visit() [1/15]

void retdec::llvmir2hll::ConstOperatorConstSubOptimizer::visit ( ShPtr< AddOpExpr expr)
overrideprivatevirtual

◆ visit() [2/15]

void retdec::llvmir2hll::ConstOperatorConstSubOptimizer::visit ( ShPtr< AndOpExpr expr)
overrideprivatevirtual

◆ visit() [3/15]

void retdec::llvmir2hll::ConstOperatorConstSubOptimizer::visit ( ShPtr< BitAndOpExpr expr)
overrideprivatevirtual

◆ visit() [4/15]

void retdec::llvmir2hll::ConstOperatorConstSubOptimizer::visit ( ShPtr< BitOrOpExpr expr)
overrideprivatevirtual

◆ visit() [5/15]

void retdec::llvmir2hll::ConstOperatorConstSubOptimizer::visit ( ShPtr< BitXorOpExpr expr)
overrideprivatevirtual

◆ visit() [6/15]

void retdec::llvmir2hll::ConstOperatorConstSubOptimizer::visit ( ShPtr< DivOpExpr expr)
overrideprivatevirtual

◆ visit() [7/15]

void retdec::llvmir2hll::ConstOperatorConstSubOptimizer::visit ( ShPtr< EqOpExpr expr)
overrideprivatevirtual

◆ visit() [8/15]

void retdec::llvmir2hll::ConstOperatorConstSubOptimizer::visit ( ShPtr< GtEqOpExpr expr)
overrideprivatevirtual

◆ visit() [9/15]

void retdec::llvmir2hll::ConstOperatorConstSubOptimizer::visit ( ShPtr< GtOpExpr expr)
overrideprivatevirtual

◆ visit() [10/15]

void retdec::llvmir2hll::ConstOperatorConstSubOptimizer::visit ( ShPtr< LtEqOpExpr expr)
overrideprivatevirtual

◆ visit() [11/15]

void retdec::llvmir2hll::ConstOperatorConstSubOptimizer::visit ( ShPtr< LtOpExpr expr)
overrideprivatevirtual

◆ visit() [12/15]

void retdec::llvmir2hll::ConstOperatorConstSubOptimizer::visit ( ShPtr< MulOpExpr expr)
overrideprivatevirtual

◆ visit() [13/15]

void retdec::llvmir2hll::ConstOperatorConstSubOptimizer::visit ( ShPtr< NeqOpExpr expr)
overrideprivatevirtual

◆ visit() [14/15]

void retdec::llvmir2hll::ConstOperatorConstSubOptimizer::visit ( ShPtr< OrOpExpr expr)
overrideprivatevirtual

◆ visit() [15/15]

void retdec::llvmir2hll::ConstOperatorConstSubOptimizer::visit ( ShPtr< SubOpExpr expr)
overrideprivatevirtual

The documentation for this class was generated from the following files: