|
434
|
1 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN""http://www.w3.org/TR/html4/loose.dtd">
|
|
|
2 <HTML
|
|
|
3 ><HEAD
|
|
|
4 ><TITLE
|
|
|
5 >Symbols</TITLE
|
|
|
6 ><META
|
|
|
7 NAME="GENERATOR"
|
|
|
8 CONTENT="Modular DocBook HTML Stylesheet Version 1.79"><LINK
|
|
|
9 REL="HOME"
|
|
|
10 TITLE="LW Tool Chain"
|
|
|
11 HREF="index.html"><LINK
|
|
|
12 REL="UP"
|
|
|
13 TITLE="LWASM"
|
|
|
14 HREF="c43.html"><LINK
|
|
|
15 REL="PREVIOUS"
|
|
|
16 TITLE="Source Format"
|
|
|
17 HREF="x168.html"><LINK
|
|
|
18 REL="NEXT"
|
|
|
19 TITLE="Numbers and Expressions"
|
|
|
20 HREF="x183.html"></HEAD
|
|
|
21 ><BODY
|
|
|
22 CLASS="SECTION"
|
|
|
23 BGCOLOR="#FFFFFF"
|
|
|
24 TEXT="#000000"
|
|
|
25 LINK="#0000FF"
|
|
|
26 VLINK="#840084"
|
|
|
27 ALINK="#0000FF"
|
|
|
28 ><DIV
|
|
|
29 CLASS="NAVHEADER"
|
|
|
30 ><TABLE
|
|
|
31 SUMMARY="Header navigation table"
|
|
|
32 WIDTH="100%"
|
|
|
33 BORDER="0"
|
|
|
34 CELLPADDING="0"
|
|
|
35 CELLSPACING="0"
|
|
|
36 ><TR
|
|
|
37 ><TH
|
|
|
38 COLSPAN="3"
|
|
|
39 ALIGN="center"
|
|
|
40 >LW Tool Chain</TH
|
|
|
41 ></TR
|
|
|
42 ><TR
|
|
|
43 ><TD
|
|
|
44 WIDTH="10%"
|
|
|
45 ALIGN="left"
|
|
|
46 VALIGN="bottom"
|
|
|
47 ><A
|
|
|
48 HREF="x168.html"
|
|
|
49 ACCESSKEY="P"
|
|
|
50 >Prev</A
|
|
|
51 ></TD
|
|
|
52 ><TD
|
|
|
53 WIDTH="80%"
|
|
|
54 ALIGN="center"
|
|
|
55 VALIGN="bottom"
|
|
|
56 >Chapter 3. LWASM</TD
|
|
|
57 ><TD
|
|
|
58 WIDTH="10%"
|
|
|
59 ALIGN="right"
|
|
|
60 VALIGN="bottom"
|
|
|
61 ><A
|
|
|
62 HREF="x183.html"
|
|
|
63 ACCESSKEY="N"
|
|
|
64 >Next</A
|
|
|
65 ></TD
|
|
|
66 ></TR
|
|
|
67 ></TABLE
|
|
|
68 ><HR
|
|
|
69 ALIGN="LEFT"
|
|
|
70 WIDTH="100%"></DIV
|
|
|
71 ><DIV
|
|
|
72 CLASS="SECTION"
|
|
|
73 ><H1
|
|
|
74 CLASS="SECTION"
|
|
|
75 ><A
|
|
|
76 NAME="AEN178"
|
|
|
77 >3.4. Symbols</A
|
|
|
78 ></H1
|
|
|
79 ><P
|
|
|
80 >Symbols have no length restriction. They may contain letters, numbers, dots,
|
|
|
81 dollar signs, and underscores. They must start with a letter, dot, or
|
|
|
82 underscore.</P
|
|
|
83 ><P
|
|
|
84 >LWASM also supports the concept of a local symbol. A local symbol is one
|
|
|
85 which contains either a "?" or a "@", which can appear anywhere in the symbol.
|
|
|
86 The scope of a local symbol is determined by a number of factors. First,
|
|
|
87 each included file gets its own local symbol scope. A blank line will also
|
|
|
88 be considered a local scope barrier. Macros each have their own local symbol
|
|
|
89 scope as well (which has a side effect that you cannot use a local symbol
|
|
|
90 as an argument to a macro). There are other factors as well. In general,
|
|
|
91 a local symbol is restricted to the block of code it is defined within.</P
|
|
|
92 ><P
|
|
|
93 >By default, unless assembling to the os9 target, a "$" in the symbol will
|
|
|
94 also make it local. This can be controlled by the "dollarlocal" and
|
|
|
95 "nodollarlocal" pragmas. In the absence of a pragma to the contrary, for
|
|
|
96 the os9 target, a "$" in the symbol will not make it considered local while
|
|
|
97 for all other targets it will.</P
|
|
|
98 ></DIV
|
|
|
99 ><DIV
|
|
|
100 CLASS="NAVFOOTER"
|
|
|
101 ><HR
|
|
|
102 ALIGN="LEFT"
|
|
|
103 WIDTH="100%"><TABLE
|
|
|
104 SUMMARY="Footer navigation table"
|
|
|
105 WIDTH="100%"
|
|
|
106 BORDER="0"
|
|
|
107 CELLPADDING="0"
|
|
|
108 CELLSPACING="0"
|
|
|
109 ><TR
|
|
|
110 ><TD
|
|
|
111 WIDTH="33%"
|
|
|
112 ALIGN="left"
|
|
|
113 VALIGN="top"
|
|
|
114 ><A
|
|
|
115 HREF="x168.html"
|
|
|
116 ACCESSKEY="P"
|
|
|
117 >Prev</A
|
|
|
118 ></TD
|
|
|
119 ><TD
|
|
|
120 WIDTH="34%"
|
|
|
121 ALIGN="center"
|
|
|
122 VALIGN="top"
|
|
|
123 ><A
|
|
|
124 HREF="index.html"
|
|
|
125 ACCESSKEY="H"
|
|
|
126 >Home</A
|
|
|
127 ></TD
|
|
|
128 ><TD
|
|
|
129 WIDTH="33%"
|
|
|
130 ALIGN="right"
|
|
|
131 VALIGN="top"
|
|
|
132 ><A
|
|
|
133 HREF="x183.html"
|
|
|
134 ACCESSKEY="N"
|
|
|
135 >Next</A
|
|
|
136 ></TD
|
|
|
137 ></TR
|
|
|
138 ><TR
|
|
|
139 ><TD
|
|
|
140 WIDTH="33%"
|
|
|
141 ALIGN="left"
|
|
|
142 VALIGN="top"
|
|
|
143 >Source Format</TD
|
|
|
144 ><TD
|
|
|
145 WIDTH="34%"
|
|
|
146 ALIGN="center"
|
|
|
147 VALIGN="top"
|
|
|
148 ><A
|
|
|
149 HREF="c43.html"
|
|
|
150 ACCESSKEY="U"
|
|
|
151 >Up</A
|
|
|
152 ></TD
|
|
|
153 ><TD
|
|
|
154 WIDTH="33%"
|
|
|
155 ALIGN="right"
|
|
|
156 VALIGN="top"
|
|
|
157 >Numbers and Expressions</TD
|
|
|
158 ></TR
|
|
|
159 ></TABLE
|
|
|
160 ></DIV
|
|
|
161 ></BODY
|
|
|
162 ></HTML
|
|
|
163 > |
