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Added WeakLink...Generator classes (should have done that ages ago). These check the c-function pointer for being NULL before calling it and raise UnimplementedError if it is.

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This allows system libs to be weak-linked, thereby allowing us to generate functions that are only available on some OS versions without getting a NULL dereference if the function isn't available.
This commit is contained in:
Jack Jansen 2001-07-01 22:09:29 +00:00
parent 340d98f564
commit eefac35594
2 changed files with 22 additions and 0 deletions
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4
Tools/bgen/bgen/bgenGenerator.py
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@ -164,6 +164,7 @@ class FunctionGenerator(BaseFunctionGenerator):
def functionbody(self): def functionbody(self):
self.declarations() self.declarations()
self.precheck()
self.getargs() self.getargs()
self.callit() self.callit()
self.checkit() self.checkit()
@ -194,6 +195,9 @@ class FunctionGenerator(BaseFunctionGenerator):
continue continue
if arg.mode in (InMode, InOutMode): if arg.mode in (InMode, InOutMode):
arg.getargsCheck() arg.getargsCheck()
def precheck(self):
pass
def callit(self): def callit(self):
args = "" args = ""

18
Tools/bgen/bgen/macsupport.py
View file

@ -118,6 +118,14 @@ VarVarOutBuffer = VarVarHeapOutputBufferType('char', 'long', 'l') # (buf, len, &
includestuff = """ includestuff = """
#include "macglue.h" #include "macglue.h"
#include "pymactoolbox.h" #include "pymactoolbox.h"
/* Macro to test whether a weak-loaded CFM function exists */
#define PyMac_PRECHECK(rtn) do { if ( &rtn == NULL ) {\\
PyErr_SetString(PyExc_NotImplementedError, \\
"Not available in this shared library/OS version"); \\
return NULL; \\
}} while(0)
""" """
# Stuff added just before the module's init function # Stuff added just before the module's init function
@ -145,6 +153,16 @@ class OSErrMixIn:
class OSErrFunctionGenerator(OSErrMixIn, FunctionGenerator): pass class OSErrFunctionGenerator(OSErrMixIn, FunctionGenerator): pass
class OSErrMethodGenerator(OSErrMixIn, MethodGenerator): pass class OSErrMethodGenerator(OSErrMixIn, MethodGenerator): pass
class WeakLinkMixIn:
"Mix-in to test the function actually exists (!= NULL) before calling"
def precheck(self):
Output('PyMac_PRECHECK(%s);', self.name)
class WeakLinkFunctionGenerator(WeakLinkMixIn, FunctionGenerator): pass
class WeakLinkMethodGenerator(WeakLinkMixIn, MethodGenerator): pass
class OSErrWeakLinkFunctionGenerator(OSErrMixIn, WeakLinkMixIn, FunctionGenerator): pass
class OSErrWeakLinkMethodGenerator(OSErrMixIn, WeakLinkMixIn, MethodGenerator): pass
class MacModule(Module): class MacModule(Module):
"Subclass which gets the exception initializer from macglue.c" "Subclass which gets the exception initializer from macglue.c"