private void atStringConcatExpr(Expr expr, int type1, int dim1, String cname1)
throws CompileError {
int type2 = exprType;
int dim2 = arrayDim;
boolean type2Is2 = is2word(type2, dim2);
boolean type2IsString = (type2 == CLASS && jvmJavaLangString.equals(className));
if (type2Is2) convToString(type2, dim2);
if (is2word(type1, dim1)) {
bytecode.addOpcode(DUP_X2);
bytecode.addOpcode(POP);
} else bytecode.addOpcode(SWAP);
// even if type1 is String, the left operand might be null.
convToString(type1, dim1);
bytecode.addOpcode(SWAP);
if (!type2Is2 && !type2IsString) convToString(type2, dim2);
bytecode.addInvokevirtual(javaLangString, "concat", "(Ljava/lang/String;)Ljava/lang/String;");
exprType = CLASS;
arrayDim = 0;
className = jvmJavaLangString;
}
private void atStringPlusEq(Expr expr, int type, int dim, String cname, ASTree right)
throws CompileError {
if (!jvmJavaLangString.equals(cname)) badAssign(expr);
convToString(type, dim); // the value might be null.
right.accept(this);
convToString(exprType, arrayDim);
bytecode.addInvokevirtual(javaLangString, "concat", "(Ljava/lang/String;)Ljava/lang/String;");
exprType = CLASS;
arrayDim = 0;
className = jvmJavaLangString;
}