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Documented the new push/pop factility for #pragmas.

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git-svn-id: svn://svn.cc65.org/cc65/trunk@2903 b7a2c559-68d2-44c3-8de9-860c34a00d81
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cuz 2004-03-07 22:02:45 +00:00
parent d0ea9f34b6
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1 changed files with 29 additions and 9 deletions
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doc/cc65.sgml
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@ -196,7 +196,10 @@ Here is a description of all the command line options:
switch: <tt/-Or/ will enable both, the optmizer and register variables.
For more information about register variables see <ref id="regvars"
name="register variables">.
name="register variables">.
The compiler setting can also be changed within the source file by using
<tt><ref id="pragma-regvars" name="#pragma regvars"></tt>.
<tag><tt>--register-space</tt></tag>
@ -649,8 +652,10 @@ The compiler defines several macros at startup:
<sect>#pragmas<label id="pragmas"><p>
The compiler understands some pragmas that may be used to change code
generation and other stuff.
generation and other stuff. Some of these pragmas understand a special form:
If the first parameter is <tt/push/, the old value is saved onto a stack
before changing it. The value may later be restored by using the <tt/pop/
parameter with the <tt/#pragma/.
<sect1><tt>#pragma bssseg (&lt;name&gt;)</tt><p>
@ -706,8 +711,7 @@ generation and other stuff.
</verb></tscreen>
<sect1><tt>#pragma checkstack (on|off)</tt><label
id="pragma-checkstack"><p>
<sect1><tt>#pragma checkstack (on|off)</tt><label id="pragma-checkstack"><p>
Tells the compiler to insert calls to a stack checking subroutine to detect
stack overflows. The stack checking code will lead to somewhat larger and
@ -718,6 +722,7 @@ id="pragma-checkstack"><p>
If the argument is "off", stack checks are disabled (the default), otherwise
they're enabled.
The <tt/#pragma/ understands the push and pop parameters as explained above.
<sect1><tt>#pragma codeseg (&lt;name&gt;)</tt><p>
@ -767,7 +772,7 @@ id="pragma-checkstack"><p>
</verb></tscreen>
<sect1><tt>#pragma regvaraddr (on|off)</tt><p>
<sect1><tt>#pragma regvaraddr ([push,]on|off)</tt><p>
The compiler does not allow to take the address of register variables.
The regvaraddr pragma changes this. Taking the address of a register
@ -781,14 +786,26 @@ id="pragma-checkstack"><p>
and this subroutine (or a subroutine called from there) uses itself
register variables. So be careful with this #pragma.
The <tt/#pragma/ understands the push and pop parameters as explained above.
Example:
<tscreen><verb>
#pragma regvaraddr(1) /* Allow taking the address
#pragma regvaraddr(on) /* Allow taking the address
* of register variables
*/
</verb></tscreen>
<sect1><tt>#pragma regvars ([push,]on|off)</tt><label id="pragma-regvars"><p>
Enables or disables use of register variables. If register variables are
disabled (the default), the <tt/register/ keyword is ignored. Register
variables are explained in more detail in <ref id="regvars" name="a separate
chapter">.
The <tt/#pragma/ understands the push and pop parameters as explained above.
<sect1><tt>#pragma signedchars (on|off)</tt><label id="pragma-signedchars"><p>
Changes the signedness of the default character type. If the argument is
@ -797,15 +814,18 @@ id="pragma-checkstack"><p>
lot better code. This default may be overridden by the <tt/--signed-chars/
command line option.
The <tt/#pragma/ understands the push and pop parameters as explained above.
<sect1><tt>#pragma staticlocals (on|off)</tt><label
id="pragma-staticlocals"<p>
<sect1><tt>#pragma staticlocals (on|off)</tt><label id="pragma-staticlocals"<p>
Use variables in the bss segment instead of variables on the stack. This
pragma changes the default set by the compiler option <tt/-Cl/. If the
argument is "on", local variables are allocated in the BSS segment,
leading to shorter and in most cases faster, but non-reentrant code.
The <tt/#pragma/ understands the push and pop parameters as explained above.
<sect1><tt>#pragma zpsym (&lt;name&gt;)</tt><p>