RuleOrPredicate Class Reference

Simplify predication constructions involving the INT_OR operator. More...

#include <condexe.hh>

Inheritance diagram for RuleOrPredicate:

Collaboration diagram for RuleOrPredicate:

Public Member Functions
virtual Rule *	clone (const ActionGroupList &grouplist) const
	Clone the Rule. More...
virtual void	getOpList (vector< uint4 > &oplist) const
	List of op codes this rule operates on. More...
virtual int4	applyOp (PcodeOp *op, Funcdata &data)
	Attempt to apply this Rule. More...
Public Member Functions inherited from Rule
	Rule (const string &g, uint4 fl, const string &nm)
	Construct given group, properties name. More...
bool	checkActionBreak (void)
	Check if an action breakpoint is turned on. More...
virtual void	reset (Funcdata &data)
	Reset this Rule. More...
virtual void	resetStats (void)
	Reset Rule statistics. More...
virtual void	printStatistics (ostream &s) const
	Print statistics for this Rule. More...

Additional Inherited Members
Public Types inherited from Rule
enum	typeflags { type_disable = 1, rule_debug = 2, warnings_on = 4, warnings_given = 8 }
	Properties associated with a Rule. More...

Detailed Description

Simplify predication constructions involving the INT_OR operator.

In this form of predication, two variables are set based on a condition and then ORed together. Both variables may be set to zero, or to some other value, based on the condition and the zero values are such that at least one of the variables is zero.

tmp1 = cond ? val1 : 0;
tmp2 = cond ?  0 : val2;
result = tmp1 | tmp2;

The RuleOrPredicate simplifies this to

if (cond) result = val1; else result = val2;

or to be precise

newtmp = val1 ? val2;           // Using a new MULTIEQUAL
result = newtmp;

In an alternate form we have

tmp1 = (val2 == 0) ? val1 : 0
result = tmp1 | val2;

again, one of val1 or val2 must be zero, so this gets replaced with

tmp1 = val1 ? val2
result = tmp1

Member Function Documentation

applyOp()

int4 RuleOrPredicate::applyOp ( PcodeOp *  op, Funcdata &  data  )

virtual

Attempt to apply this Rule.

This method contains the main logic for applying the Rule. It must use a given PcodeOp as the point at which the Rule applies. If it does apply, changes are made directly to the function and 1 (non-zero) is returned, otherwise 0 is returned.

Parameters

op	is the given PcodeOp where the Rule may apply
data	is the function to which to apply

Reimplemented from Rule.

clone()

virtual Rule* RuleOrPredicate::clone ( const ActionGroupList &  grouplist ) const

inlinevirtual

Clone the Rule.

If this Rule is a member of one of the groups in the grouplist, this returns a clone of the Rule, otherwise NULL is returned.

Parameters

grouplist

is the list of groups being cloned

Returns

the cloned Rule or NULL

Implements Rule.

getOpList()

void RuleOrPredicate::getOpList ( vector< uint4 > &  oplist ) const

virtual

List of op codes this rule operates on.

Populate the given array with all possible OpCodes this Rule might apply to. By default, this method returns all possible OpCodes

Parameters

oplist

is the array to populate

Reimplemented from Rule.

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

• condexe.hh
• condexe.cc