A “short list” of embedded systems

CS269: HW/SW Engineering of Embedded Systems, Winter02

Abstract syntax trees

Example: annotate the AST of a file with the number of classes declared in that file.

// Identifier of our property

public static final int NUMDECL_KEY = RESERVED_PROPERTIES + 1;

// Method to perform the annotation

void annoteNumDecls(CompileUnitNode ast) {

int numDecls = ast.getDefTypes().size();

ast.setProperty(NUMDECL_KEY,new Integer(numDecls));

}

// Method to read the annotation

int getNumDecls(CompileUnitNode ast) {

Integer num = (Integer) getProperty(NUMDECL_KEY,val);

return num.intValue();

}