arguments.html

来自「gcc手册」· HTML 代码 · 共 46 行

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<title>Using as</title>

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Node:<a name="Arguments">Arguments</a>,

Next:<a rel="next" accesskey="n" href="Operators.html#Operators">Operators</a>,

Up:<a rel="up" accesskey="u" href="Integer-Exprs.html#Integer%20Exprs">Integer Exprs</a>

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<h4 class="subsection">Arguments</h4>



   <p><dfn>Arguments</dfn> are symbols, numbers or subexpressions.  In other

contexts arguments are sometimes called "arithmetic operands".  In

this manual, to avoid confusing them with the "instruction operands" of

the machine language, we use the term "argument" to refer to parts of

expressions only, reserving the word "operand" to refer only to machine

instruction operands.



   <p>Symbols are evaluated to yield {<var>section</var> <var>NNN</var>} where

<var>section</var> is one of text, data, bss, absolute,

or undefined.  <var>NNN</var> is a signed, 2's complement 32 bit

integer.



   <p>Numbers are usually integers.



   <p>A number can be a flonum or bignum.  In this case, you are warned

that only the low order 32 bits are used, and <code>as</code> pretends

these 32 bits are an integer.  You may write integer-manipulating

instructions that act on exotic constants, compatible with other

assemblers.



   <p>Subexpressions are a left parenthesis <code>(</code> followed by an integer

expression, followed by a right parenthesis <code>)</code>; or a prefix

operator followed by an argument.



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