retdec
Public Member Functions | Static Public Member Functions | Private Member Functions | List of all members
retdec::llvmir2hll::BoolComparisonSubOptimizer Class Referencefinal

Simplification of comparisons with true and false. More...

#include <bool_comparison_optimizer.h>

Inheritance diagram for retdec::llvmir2hll::BoolComparisonSubOptimizer:
Inheritance graph
[legend]
Collaboration diagram for retdec::llvmir2hll::BoolComparisonSubOptimizer:
Collaboration graph
[legend]

Public Member Functions

 BoolComparisonSubOptimizer (ShPtr< ArithmExprEvaluator > arithmExprEvaluator)
 Constructs the sub-optimizer. 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< 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< 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< 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
 
- Public Member Functions inherited from retdec::llvmir2hll::Visitor
virtual ~Visitor ()=default
 

Static Public Member Functions

static ShPtr< SubOptimizercreate (ShPtr< ArithmExprEvaluator > arithmExprEvaluator)
 Creates a new sub-optimizer. More...
 

Private Member Functions

template<typename ExprType >
void optimizeNestedComparisons (ExprType expr)
 
void replaceWithFirstOperand (ShPtr< BinaryOpExpr > expr)
 
void replaceWithNegationOfFirstOperand (ShPtr< BinaryOpExpr > expr)
 
Visitor Interface
virtual void visit (ShPtr< EqOpExpr > expr) override
 
virtual void visit (ShPtr< NeqOpExpr > 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

Simplification of comparisons with true and false.

This sub-optimizer simplifies comparisons with true and false by transforming the expression so that the comparison is not needed. For example,

if (a < 5 == true)

is simplified to

if (a < 5)

and

if (a < 5 == false)

is simplified to

if (a >= 5)

Instances of this class have reference object semantics.

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

Constructor & Destructor Documentation

◆ BoolComparisonSubOptimizer()

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

Constructs the sub-optimizer.

Parameters
[in]arithmExprEvaluatorThe used evaluator of arithmetical expressions.

Member Function Documentation

◆ create()

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

Creates a new sub-optimizer.

Parameters
[in]arithmExprEvaluatorThe used evaluator of arithmetical expressions.

◆ getId()

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

Returns the ID of the optimizer.

Implements retdec::llvmir2hll::SubOptimizer.

◆ optimizeNestedComparisons()

template<typename ExprType >
void retdec::llvmir2hll::BoolComparisonSubOptimizer::optimizeNestedComparisons ( ExprType  expr)
private

◆ replaceWithFirstOperand()

void retdec::llvmir2hll::BoolComparisonSubOptimizer::replaceWithFirstOperand ( ShPtr< BinaryOpExpr expr)
private

◆ replaceWithNegationOfFirstOperand()

void retdec::llvmir2hll::BoolComparisonSubOptimizer::replaceWithNegationOfFirstOperand ( ShPtr< BinaryOpExpr expr)
private

◆ visit() [1/2]

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

◆ visit() [2/2]

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

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