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Java Source Code / Java Documentation » Database DBMS » db4o 6.4 » EDU.purdue.cs.bloat.ssa

Source Cross Reference Class Diagram Java Document (Java Doc)

java.lang .Object

EDU.purdue.cs.bloat.ssa .SSAConstructionInfo

SSAConstructionInfo
public class SSAConstructionInfo (Code)
	`SSAConstructionInfo` contains information needed to convert a CFG into SSA form. Each variable (VarExpr) has an SSAConstructionInfo associated with it. Each `SSAConstructionInfo` keeps track of information such as the `PhiStmt`s that define copies of the variable, the `Block`s in which the variable is defined, and the occurrences (uses) of the variable in both phi and non-phi statements. Note that no `PhiStmt` is really inserted into a basic block. We just keep track of the mapping. It should also be noted that once a phi statement for a given variable is "inserted" into a block, no other phi statement for that variable is inserted. Thus, the order of insertion determines the precedence of the phi statements: `PhiReturnStmt` > `PhiCatchStmt` > `PhiJoinStmt`. Additionally, `SSAConstruction` has methods to insert various flavors of `PhiStmt`s whose targets are the variable associated with the `SSAConstruction` into `Block`s. See Also: SSA See Also: PhiStmt See Also: PhiCatchStmt See Also: PhiJoinStmt See Also: PhiReturnStmt

Field Summary
LinkedList	allReals
FlowGraph	cfg
Set	defBlocks
PhiStmt[]	phis
VarExpr	prototype
LinkedList[]	reals

Constructor Summary
public	SSAConstructionInfo(FlowGraph cfg, VarExpr expr) Constructor.

Method Summary
public void	addCatchPhi(Block block) Inserts a `PhiCatchStmt` (whose target is the variable represented by this `SSAConstructionInfo`) into a given `Block`.
public void	addDefBlock(Block block) Makes note of a `Block` in which the variable is defined by a `PhiStmt`.
public void	addPhi(Block block) Adds a `PhiJoinStmt` for the variable represented by this `SSAConstructionInfo` to a given `Block`.
public void	addReal(VarExpr real) Notes a real occurrence (that is, a use that is not an operand to a phi statement) of the variable represented by this `SSAConstructionInfo`.
public void	addRetPhis(Subroutine sub) Adds a `PhiReturnStmt` to all of the `Block`s that are executed upon returning from a given `Subroutine`.
public Collection	defBlocks() Returns the Blocks containing a definition of the variable represented by this SSAConstruction info.
public PhiStmt	phiAtBlock(Block block) Returns the phi statement for the variable represented by this SSAConstructionInfo at a given block in the CFG.
public VarExpr	prototype() Returns the program variable associated with this `SSAConstructionInfo`.
public Collection	reals() Returns all of the real occurrences of this variable.
public Collection	realsAtBlock(Block block) Returns all of the real occurrences of this variable in a given block.
public void	removePhiAtBlock(Block block) Removes the phi statement for this variable at a given block.

Field Detail

allReals
LinkedList allReals(Code)

cfg
FlowGraph cfg(Code)

defBlocks
Set defBlocks(Code)

phis
PhiStmt[] phis(Code)

prototype
VarExpr prototype(Code)

reals
LinkedList[] reals(Code)

Constructor Detail

SSAConstructionInfo
public SSAConstructionInfo(FlowGraph cfg, VarExpr expr)(Code)
	Constructor. Parameters: cfg - The control flow graph that is being converted to SSA form. Parameters: expr - A variable in the CFG on which SSA analysis is being done.

Method Detail

addCatchPhi
public void addCatchPhi(Block block)(Code)
	Inserts a `PhiCatchStmt` (whose target is the variable represented by this `SSAConstructionInfo`) into a given `Block`. See Also: PhiCatchStmt

addDefBlock
public void addDefBlock(Block block)(Code)
	Makes note of a `Block` in which the variable is defined by a `PhiStmt`.

addPhi
public void addPhi(Block block)(Code)
	Adds a `PhiJoinStmt` for the variable represented by this `SSAConstructionInfo` to a given `Block`.

addReal
public void addReal(VarExpr real)(Code)
	Notes a real occurrence (that is, a use that is not an operand to a phi statement) of the variable represented by this `SSAConstructionInfo`. See Also: PhiStmt

addRetPhis
public void addRetPhis(Subroutine sub)(Code)
	Adds a `PhiReturnStmt` to all of the `Block`s that are executed upon returning from a given `Subroutine`. See Also: PhiReturnStmt See Also: Subroutine.paths

defBlocks
public Collection defBlocks()(Code)
	Returns the Blocks containing a definition of the variable represented by this SSAConstruction info.

phiAtBlock
public PhiStmt phiAtBlock(Block block)(Code)
	Returns the phi statement for the variable represented by this SSAConstructionInfo at a given block in the CFG.

prototype
public VarExpr prototype()(Code)
	Returns the program variable associated with this `SSAConstructionInfo`.

reals
public Collection reals()(Code)
	Returns all of the real occurrences of this variable.

realsAtBlock
public Collection realsAtBlock(Block block)(Code)
	Returns all of the real occurrences of this variable in a given block.

removePhiAtBlock
public void removePhiAtBlock(Block block)(Code)
	Removes the phi statement for this variable at a given block.

Methods inherited from java.lang.Object

native protected Object clone() throws CloneNotSupportedException(Code)(Java Doc)
public boolean equals(Object obj)(Code)(Java Doc)
protected void finalize() throws Throwable(Code)(Java Doc)
final native public Class getClass()(Code)(Java Doc)
native public int hashCode()(Code)(Java Doc)
final native public void notify()(Code)(Java Doc)
final native public void notifyAll()(Code)(Java Doc)
public String toString()(Code)(Java Doc)
final native public void wait(long timeout) throws InterruptedException(Code)(Java Doc)
final public void wait(long timeout, int nanos) throws InterruptedException(Code)(Java Doc)
final public void wait() throws InterruptedException(Code)(Java Doc)

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