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| <h3 class="section">3.3 Comments</h3> |
| |
| <p><a name="index-comments-123"></a>There are two ways of rendering comments to <samp><span class="command">as</span></samp>. In both |
| cases the comment is equivalent to one space. |
| |
| <p>Anything from ‘<samp><span class="samp">/*</span></samp>’ through the next ‘<samp><span class="samp">*/</span></samp>’ is a comment. |
| This means you may not nest these comments. |
| |
| <pre class="smallexample"> /* |
| The only way to include a newline ('\n') in a comment |
| is to use this sort of comment. |
| */ |
| |
| /* This sort of comment does not nest. */ |
| </pre> |
| <p><a name="index-line-comment-character-124"></a>Anything from the <dfn>line comment</dfn> character to the next newline |
| is considered a comment and is ignored. The line comment character is |
| ‘<samp><span class="samp">;</span></samp>’ on the ARC; |
| ‘<samp><span class="samp">@</span></samp>’ on the ARM; |
| ‘<samp><span class="samp">;</span></samp>’ for the H8/300 family; |
| ‘<samp><span class="samp">;</span></samp>’ for the HPPA; |
| ‘<samp><span class="samp">#</span></samp>’ on the i386 and x86-64; |
| ‘<samp><span class="samp">#</span></samp>’ on the i960; |
| ‘<samp><span class="samp">;</span></samp>’ for the PDP-11; |
| ‘<samp><span class="samp">;</span></samp>’ for picoJava; |
| ‘<samp><span class="samp">#</span></samp>’ for Motorola PowerPC; |
| ‘<samp><span class="samp">#</span></samp>’ for IBM S/390; |
| ‘<samp><span class="samp">#</span></samp>’ for the Sunplus SCORE; |
| ‘<samp><span class="samp">!</span></samp>’ for the Renesas / SuperH SH; |
| ‘<samp><span class="samp">!</span></samp>’ on the SPARC; |
| ‘<samp><span class="samp">#</span></samp>’ on the ip2k; |
| ‘<samp><span class="samp">#</span></samp>’ on the m32c; |
| ‘<samp><span class="samp">#</span></samp>’ on the m32r; |
| ‘<samp><span class="samp">|</span></samp>’ on the 680x0; |
| ‘<samp><span class="samp">#</span></samp>’ on the 68HC11 and 68HC12; |
| ‘<samp><span class="samp">#</span></samp>’ on the RX; |
| ‘<samp><span class="samp">;</span></samp>’ on the TMS320C6X; |
| ‘<samp><span class="samp">#</span></samp>’ on the Vax; |
| ‘<samp><span class="samp">;</span></samp>’ for the Z80; |
| ‘<samp><span class="samp">!</span></samp>’ for the Z8000; |
| ‘<samp><span class="samp">#</span></samp>’ on the V850; |
| ‘<samp><span class="samp">#</span></samp>’ for Xtensa systems; |
| see <a href="Machine-Dependencies.html#Machine-Dependencies">Machine Dependencies</a>. |
| <!-- FIXME What about i860? --> |
| |
| <p>On some machines there are two different line comment characters. One |
| character only begins a comment if it is the first non-whitespace character on |
| a line, while the other always begins a comment. |
| |
| <p>The V850 assembler also supports a double dash as starting a comment that |
| extends to the end of the line. |
| |
| <p>‘<samp><span class="samp">--</span></samp>’; |
| |
| <p><a name="index-g_t_0023-125"></a><a name="index-lines-starting-with-_0040code_007b_0023_007d-126"></a><a name="index-logical-line-numbers-127"></a>To be compatible with past assemblers, lines that begin with ‘<samp><span class="samp">#</span></samp>’ have a |
| special interpretation. Following the ‘<samp><span class="samp">#</span></samp>’ should be an absolute |
| expression (see <a href="Expressions.html#Expressions">Expressions</a>): the logical line number of the <em>next</em> |
| line. Then a string (see <a href="Strings.html#Strings">Strings</a>) is allowed: if present it is a |
| new logical file name. The rest of the line, if any, should be whitespace. |
| |
| <p>If the first non-whitespace characters on the line are not numeric, |
| the line is ignored. (Just like a comment.) |
| |
| <pre class="smallexample"> # This is an ordinary comment. |
| # 42-6 "new_file_name" # New logical file name |
| # This is logical line # 36. |
| </pre> |
| <p>This feature is deprecated, and may disappear from future versions |
| of <samp><span class="command">as</span></samp>. |
| |
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