Package jminusminus

Class JVariable

java.lang.Object

jminusminus.JAST

jminusminus.JStatement

jminusminus.JExpression

jminusminus.JVariable

All Implemented Interfaces:

JLhs

class JVariable
extends JExpression
implements JLhs

The AST node for an identifier used as a primary expression.

Field Summary

Fields inherited from class jminusminus.JExpression

isStatementExpression, type

Fields inherited from class jminusminus.JAST

compilationUnit, line

Constructor Summary

Constructors

Constructor	Description
JVariable(int line, String name)	Constructs the AST node for a variable.

Method Summary

Modifier and Type	Method	Description
JExpression	analyze(Context context)	Analyzes and returns a JExpression.
JExpression	analyzeLhs(Context context)	Analyzes the lhs of an assignment.
void	codegen(CLEmitter output)	Performs code generation for this AST.
void	codegen(CLEmitter output, String targetLabel, boolean onTrue)	Performs short-circuit code generation for a boolean expression, given the code emitter, a target label, and whether we branch to that label on true or on false.
void	codegenDuplicateRvalue(CLEmitter output)	Generates the code to duplicate the Rvalue that is on the stack because it is to be used in a surrounding expression, as in a[i] = x--.
void	codegenLoadLhsLvalue(CLEmitter output)	Generates code to load onto the stack any part of the lhs that must be there, as in a[i] = x.
void	codegenLoadLhsRvalue(CLEmitter output)	Generates code to load an Rvalue of the lhs, as in a += x.
void	codegenStore(CLEmitter output)	Generates the code to do the actual assignment.
IDefn	iDefn()	Returns the identifier's definition.
String	name()	Returns the identifier name.
void	toJSON(JSONElement json)	Stores information about this AST in JSON format.

Methods inherited from class jminusminus.JExpression

isStatementExpression, type

Methods inherited from class jminusminus.JAST

line, partialCodegen, unescape

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

JVariable

public JVariable(int line,
 String name)

Constructs the AST node for a variable.

Parameters:

line - line in which the variable occurs in the source file.

name - the name.

Method Details

name

public String name()

Returns the identifier name.

Returns:

the identifier name.

iDefn

public IDefn iDefn()

Returns the identifier's definition.

Returns:

the identifier's definition.

analyze

public JExpression analyze(Context context)

Analyzes and returns a JExpression.

Specified by:

analyze in class JExpression

Parameters:

context - context in which names are resolved.

Returns:

the analyzed (and possibly rewritten) AST subtree.

analyzeLhs

public JExpression analyzeLhs(Context context)

Analyzes the lhs of an assignment. This is very much like the analyze() methods, but perhaps a little more selective here and there.

Specified by:

analyzeLhs in interface JLhs

Parameters:

context - context in which names are resolved.

Returns:

the analyzed (and possibly rewritten) AST subtree.

codegen

public void codegen(CLEmitter output)

Performs code generation for this AST.

Specified by:

codegen in class JAST

Parameters:

output - the code emitter.

codegen

public void codegen(CLEmitter output,
 String targetLabel,
 boolean onTrue)

Performs short-circuit code generation for a boolean expression, given the code emitter, a target label, and whether we branch to that label on true or on false.

Overrides:

codegen in class JExpression

Parameters:

output - the code emitter.

targetLabel - the label to which we should branch.

onTrue - do we branch on true?

codegenLoadLhsLvalue

public void codegenLoadLhsLvalue(CLEmitter output)

Generates code to load onto the stack any part of the lhs that must be there, as in a[i] = x.

Specified by:

codegenLoadLhsLvalue in interface JLhs

Parameters:

output - the code emitter.

codegenLoadLhsRvalue

public void codegenLoadLhsRvalue(CLEmitter output)

Generates code to load an Rvalue of the lhs, as in a += x.

Specified by:

codegenLoadLhsRvalue in interface JLhs

Parameters:

output - the code emitter.

codegenDuplicateRvalue

public void codegenDuplicateRvalue(CLEmitter output)

Generates the code to duplicate the Rvalue that is on the stack because it is to be used in a surrounding expression, as in a[i] = x--.

Specified by:

codegenDuplicateRvalue in interface JLhs

Parameters:

output - the code emitter.

codegenStore

public void codegenStore(CLEmitter output)

Generates the code to do the actual assignment.

Specified by:

codegenStore in interface JLhs

Parameters:

output - the code emitter.

toJSON

public void toJSON(JSONElement json)

Stores information about this AST in JSON format.

Overrides:

toJSON in class JAST

Parameters:

json - the JSON emitter.