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Clarify calling order for constructors/destructors

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git-svn-id: svn://svn.cc65.org/cc65/trunk@2266 b7a2c559-68d2-44c3-8de9-860c34a00d81
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cuz 2003-08-12 10:29:06 +00:00
parent f28586ffcc
commit 53dc9dedf0
1 changed files with 28 additions and 13 deletions
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doc/ca65.sgml
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@ -846,16 +846,16 @@ Here's a list of all control commands and a description, what they do:
id=".DESTRUCTOR" name=".DESTRUCTOR"></tt> commands are actually shortcuts
for <tt/.CONDES/ with a type of <tt/constructor/ resp. <tt/destructor/.
After the type, an optional priority may be specified. If no priority is
given, the default priority of 7 is used. Be careful when assigning
priorities to your own module constructors so they won't interfere with the
ones in the cc65 library.
After the type, an optional priority may be specified. Higher numeric values
mean higher priority. If no priority is given, the default priority of 7 is
used. Be careful when assigning priorities to your own module constructors
so they won't interfere with the ones in the cc65 library.
Example:
<tscreen><verb>
.condes ModuleInit, constructor
.condes ModInit, 0, 16
.condes ModuleInit, constructor
.condes ModInit, 0, 16
</verb></tscreen>
See the <tt><ref id=".CONSTRUCTOR" name=".CONSTRUCTOR"></tt> and <tt><ref
@ -911,9 +911,10 @@ Here's a list of all control commands and a description, what they do:
A constructor is always exported as an absolute (16 bit) symbol. You don't
need to use an additional <tt/.export/ statement, this is implied by
<tt/.constructor/. It may have an optional priority that is separated by a
comma. If no priority is given, the default priority of 7 is used. Be
careful when assigning priorities to your own module constructors so they
won't interfere with the ones in the cc65 library.
comma. Higher numeric values mean a higher priority. If no priority is
given, the default priority of 7 is used. Be careful when assigning
priorities to your own module constructors so they won't interfere with the
ones in the cc65 library.
Example:
@ -1041,9 +1042,10 @@ Here's a list of all control commands and a description, what they do:
A destructor is always exported as an absolute (16 bit) symbol. You don't
need to use an additional <tt/.export/ statement, this is implied by
<tt/.destructor/. It may have an optional priority that is separated by a
comma. If no priority is given, the default priority of 7 is used. Be
careful when assigning priorities to your own module destructors so they
won't interfere with the ones in the cc65 library.
comma. Higher numerical values mean a higher priority. If no priority is
given, the default priority of 7 is used. Be careful when assigning
priorities to your own module destructors so they won't interfere with the
ones in the cc65 library.
Example:
@ -2266,7 +2268,7 @@ Here's a list of all control commands and a description, what they do:
"proprietary and confidential".
See: <tt><ref id=".P02" name=".P02"></tt>, <tt><ref id=".PSC02"
name=".PSC02"></tt>, <tt><ref id=".PC02" name=".PC02"></tt>, and
name=".PSC02"></tt>, <tt><ref id=".PC02" name=".PC02"></tt>, and
<tt><ref id=".P816" name=".P816"></tt>
@ -2843,6 +2845,19 @@ two bytes in the table (a pointer to the function).
</enum>
<sect1>Calling order<p>
Both, constructors and destructors are sorted in increasing priority order by
the linker when using one of the builtin linker configurations, so the
functions with lower priorities come first and are followed by those with
higher priorities. The C library runtime subroutine that walks over the
constructor and destructor tables calls the functions starting from the top of
the table - which means that functions with a high priority are called first.
So when using the C runtime, both constructors and destructors are called with
high priority functions first, followed by low priority functions.
<sect1>Pitfalls<p>
When creating and using module constructors and destructors, please take care