Code Generation for a Virtual Machine - Crafting a Compiler - page 438

class LHSVisitor extends NodeVisitor
constructor LHSV isitor (MethodBodyVisitor valueVisitor )

this . valueVisitor ← valueVisitor

53

end

procedure visit ( LocalReferencing n )

54

/ Section 11.4.1 on page 437 /

end

procedure visit (StaticReferencing n )

55

/ Section 11.4.2 on page 438 /

end

procedure visit (FieldReferencing n )

56

/ Section 11.4.3 on page 439 /

end

procedure visit (ArrayReferencing n )

57

/ Section 11.4.4 on page 439 /

end

end

Figure 11.3: Structure of the left-hand side visitor.

AST JVM Instructions

LocalReferencing

; Instruction saved for later use:

istore 5

a

n

The box shows the instruction saved at Marker 58 if the local reference a is
associated with local 5 and its type is int.

11.4.2 Static References

/ Visitor code for Marker 55 /

procedure visit (StaticReferencing n )

( new StaticStore( n . getType(), n . getName( ))) call set S tore

59

end

Code generation for assignments to statics resembles assignments to locals.
Marker 59 creates an instruction that will assign the static name contained
in the StaticReferencingnode. The type of that reference may be required to
generate the appropriate instruction.