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wxWidgets/wxPython/wxSWIG/SWIG/emit.cxx
Robin Dunn c90f71dd8c Since I have made several changes to SWIG over the years to accomodate 
special cases and other things in wxPython, and since I plan on making
several more, I've decided to put the SWIG sources in wxPython's CVS
instead of relying on maintaining patches.  This effectivly becomes a
fork of an obsolete version of SWIG, :-( but since SWIG 1.3 still
doesn't have some things I rely on in 1.1, not to mention that my
custom patches would all have to be redone, I felt that this is the
easier road to take.


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@15307 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
2002-04-29 19:56:57 +00:00

830 lines
21 KiB
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Raw Blame History

/*******************************************************************************
* Simplified Wrapper and Interface Generator (SWIG)
*
* Author : David Beazley
*
* Department of Computer Science
* University of Chicago
* 1100 E 58th Street
* Chicago, IL 60637
* beazley@cs.uchicago.edu
*
* Please read the file LICENSE for the copyright and terms by which SWIG
* can be used and distributed.
*******************************************************************************/
#include "internal.h"
/*******************************************************************************
* $Header$
*
* File : emit.cxx
*
* This file contains some useful functions for emitting code that would be
* common to all of the interface languages. Mainly this function deals with
* declaring functions external, creating lists of arguments, and making
* function calls.
*******************************************************************************/
// -----------------------------------------------------------------------------
// void emit_banner(FILE *f)
//
// Emits the SWIG identifying banner in the wrapper file
//
// Inputs : f = FILE handle
//
// Output : None
//
// Side Effects : None
// -----------------------------------------------------------------------------
void emit_banner(FILE *f) {
extern char *get_time();
extern char fn_header[];
fprintf(f,
"/*\n\
* FILE : %s\n\
* \n\
* This file was automatically generated by :\n\
* Simplified Wrapper and Interface Generator (SWIG)\n\
* Version %d.%d %s\n\
* \n\
* Portions Copyright (c) 1995-1998\n\
* The University of Utah and The Regents of the University of California.\n\
* Permission is granted to distribute this file in any manner provided\n\
* this notice remains intact.\n\
* \n\
* Do not make changes to this file--changes will be lost!\n\
*\n\
*/\n\n", fn_header, SWIG_MAJOR_VERSION, SWIG_MINOR_VERSION, SWIG_SPIN);
fprintf(f,"\n#define SWIGCODE\n");
}
// -----------------------------------------------------------------------------
// emit_extern_var(char *decl, DataType *t, int extern_type, FILE *f)
//
// Emits an external variables declaration. Extern_type defines the
// type of external declaration. Currently, only C/C++ declarations
// are allowed, but this might be extended to allow Fortran linkage
// someday
//
// Inputs :
// decl = Name of the declaration
// t = Datatype
// extern_type = Numeric code indicating type of extern
// 0 - No "extern"
// 1,2 - Normal extern (C/C++)
// f = FILE handle
//
// Output : None
//
// Side Effects : None
// -----------------------------------------------------------------------------
void emit_extern_var(char *decl, DataType *t, int extern_type, FILE *f) {
char *arr = 0;
if (t->arraystr) arr = t->arraystr;
else arr = "";
switch(extern_type) {
case 0:
// No extern. Just a forward reference
if (t->arraystr)
t->is_pointer--;
if (t->is_reference) {
t->is_pointer--;
fprintf(f,"%s& %s%s; \n", t->print_full(), decl, arr);
t->is_pointer++;
} else {
fprintf(f,"%s %s%s; \n", t->print_full(), decl,arr);
}
if (t->arraystr)
t->is_pointer++;
break;
case 1: case 2:
if (t->arraystr)
t->is_pointer--;
// Normal C/C++ extern
// fprintf(f,"#line %d \"%s\"\n", line_number, input_file);
if (t->is_reference) {
t->is_pointer--;
fprintf(f,"extern %s& %s%s; \n", t->print_full(), decl,arr);
t->is_pointer++;
} else {
fprintf(f,"extern %s %s%s; \n", t->print_full(), decl,arr);
}
if (t->arraystr)
t->is_pointer++;
default:
break;
}
}
// -----------------------------------------------------------------------------
// emit_extern_func(char *decl, DataType *t, ParmList *L, int extern_type,
// FILE *f)
//
// Emits an external function declaration (similiar to emit_extern_var).
//
// Inputs :
// decl = Name of declaration
// t = Return datatype
// L = parameter list
// extern_type = Type of extern
// 0 - No "extern"
// 1 - extern
// 2 - extern "C"
// 3 - Function declaration (with arg names)
// f = FILE Handle
//
// Output : None
//
// Side Effects : None
//
// -----------------------------------------------------------------------------
void emit_extern_func(char *decl, DataType *t, ParmList *L, int extern_type, FILE *f) {
switch(extern_type) {
case 0:
if (t->is_reference) {
t->is_pointer--;
fprintf(f,"%s&", t->print_full());
t->is_pointer++;
} else {
fprintf(f,"%s", t->print_full());
}
fprintf(f,"%s(", decl);
L->print_types(f);
fprintf(f,");\n");
break;
case 1:
// Normal C/C++ extern
// fprintf(f,"#line %d \"%s\"\n", line_number, input_file);
if (t->is_reference) {
t->is_pointer--;
fprintf(f,"extern %s&", t->print_full());
t->is_pointer++;
} else {
fprintf(f,"extern %s", t->print_full());
}
fprintf(f,"%s(", decl);
L->print_types(f);
fprintf(f,");\n");
break;
case 2:
// A C++ --- > C Extern
// fprintf(f,"#line %d \"%s\"\n", line_number, input_file);
if (t->is_reference) {
t->is_pointer--;
fprintf(f,"extern \"C\" %s&", t->print_full());
t->is_pointer++;
} else {
fprintf(f,"extern \"C\" %s", t->print_full());
}
fprintf(f,"%s(", decl);
L->print_types(f);
fprintf(f,");\n");
break;
case 3:
// A function declaration (for inlining )
if (t->is_reference) {
t->is_pointer--;
fprintf(f,"%s&", t->print_full());
t->is_pointer++;
} else {
fprintf(f,"%s", t->print_full());
}
fprintf(f,"%s(", decl);
L->print_args(f);
fprintf(f,")\n");
break;
default:
break;
}
}
// -----------------------------------------------------------------------------
// char *emit_local(int i)
//
// Returns the name of local variable for parameter i
//
// Inputs : i = Parameter number
//
// Output : NULL terminated ASCII string
//
// Side Effects : Result is left in a static local variable.
// -----------------------------------------------------------------------------
char *emit_local(int i) {
static char arg[64];
sprintf(arg,"_arg%d", i);
return arg;
}
// -----------------------------------------------------------------------------
// int emit_args(char *d, DataType *rt, ParmList *l, FILE *f)
//
// Creates a list of variable declarations for both the return value
// and function parameters.
//
// The return value is always called _result and arguments label as
// _arg0, _arg1, _arg2, etc...
//
// Returns the number of parameters associated with a function.
//
// Inputs :
// d = Name of function
// rt = Return type
// l = Parameter list
// f = FILE Handle
//
// Output : Number of function arguments
//
// Side Effects : None
//
// Note : This function is obsolete. Use emit_args below...
// -----------------------------------------------------------------------------
int emit_args(DataType *rt, ParmList *l, FILE *f) {
Parm *p;
int i;
char temp[64];
String def;
char *tm;
// Declare the return variable
if ((rt->type != T_VOID) || (rt->is_pointer)) {
if ((rt->type == T_USER) && (!rt->is_pointer)) {
// Special case for return by "value"
rt->is_pointer++;
fprintf(f,"\t %s _result;\n", rt->print_type());
rt->is_pointer--;
} else {
// Normal return value
fprintf(f,"\t %s _result;\n", rt->print_type());
}
}
// Emit function arguments
i = 0;
p = l->get_first();
while (p != 0) {
if ((p->t->type != T_VOID) || (p->t->is_pointer)) {
sprintf(temp,"_arg%d", i);
if (p->defvalue) {
if ((p->t->is_reference) || ((p->t->type == T_USER) && (p->call_type == CALL_REFERENCE)))
fprintf(f,"\t %s _arg%d = &%s;\n", p->t->print_type(),i, p->defvalue);
else
fprintf(f,"\t %s _arg%d = %s;\n", p->t->print_type(),i, p->defvalue);
} else {
fprintf(f,"\t %s _arg%d;\n", p->t->print_type(),i);
tm = typemap_lookup("arginit", typemap_lang, p->t, p->name,"",temp);
if (tm) {
def << tm;
}
}
// Check for ignore or default typemaps
tm = typemap_lookup("default",typemap_lang,p->t,p->name,"",temp);
if (tm)
def << tm;
tm = typemap_lookup("ignore",typemap_lang,p->t,p->name,"",temp);
if (tm) {
def << tm;
p->ignore = 1;
}
tm = typemap_check("build",typemap_lang,p->t,p->name);
if (tm) {
p->ignore = 1;
}
i++;
}
p = l->get_next();
}
fprintf(f,"%s",def.get());
// i now contains number of parameters
return(i);
}
// -----------------------------------------------------------------------------
// int emit_args(char *d, DataType *rt, ParmList *l, WrapperFunction &f)
//
// Creates a list of variable declarations for both the return value
// and function parameters.
//
// The return value is always called _result and arguments label as
// _arg0, _arg1, _arg2, etc...
//
// Returns the number of parameters associated with a function.
//
// Inputs :
// d = Name of function
// rt = Return type
// l = Parameter list
// f = Wrapper function object
//
// Output : Number of function arguments
//
// Side Effects : None
//
// -----------------------------------------------------------------------------
int emit_args(DataType *rt, ParmList *l, WrapperFunction &f) {
Parm *p;
int i;
char *tm;
// Declare the return variable
if ((rt->type != T_VOID) || (rt->is_pointer)) {
if ((rt->type == T_USER) && (!rt->is_pointer)) {
// Special case for return by "value"
rt->is_pointer++;
f.add_local(rt->print_type(), "_result");
rt->is_pointer--;
} else {
// Normal return value
f.add_local(rt->print_type(), "_result");
}
}
// Emit function arguments
i = 0;
p = l->get_first();
while (p != 0) {
if ((p->t->type != T_VOID) || (p->t->is_pointer)) {
char *temp = emit_local(i);
// Figure out default values
if (((p->t->is_reference) && (p->defvalue)) ||
((p->t->type == T_USER) && (p->call_type == CALL_REFERENCE) && (p->defvalue))) {
String deftmp;
deftmp << "(" << p->t->print_type() << ") &" << p->defvalue;
f.add_local(p->t->print_type(),temp,deftmp.get());
} else {
String deftmp;
char *dv = 0;
if (p->defvalue) {
deftmp << "(" << p->t->print_type() << ") " << p->defvalue;
dv = deftmp.get();
}
f.add_local(p->t->print_type(), temp, dv);
tm = typemap_lookup("arginit", typemap_lang, p->t,p->name,"",temp,&f);
if (tm) {
f.code << tm << "\n";
}
}
// Check for ignore or default typemaps
tm = typemap_lookup("default",typemap_lang,p->t,p->name,"",temp,&f);
if (tm)
f.code << tm << "\n";
tm = typemap_lookup("ignore",typemap_lang,p->t,p->name,"",temp,&f);
if (tm) {
f.code << tm << "\n";
p->ignore = 1;
}
tm = typemap_check("build",typemap_lang,p->t,p->name);
if (tm) {
p->ignore = 1;
}
i++;
}
p = l->get_next();
}
// i now contains number of parameters
return(i);
}
// -----------------------------------------------------------------------------
// int emit_func_call(char *decl, DataType *t, ParmList *l, FILE *f)
//
// Emits code for a function call.
//
// Inputs :
// decl = name of function
// t = Return datatype
// l = Parameter list
// f = FILE Handle
//
// Output : None
//
// Side Effects : None
//
// Note : This function is obsolete
// -----------------------------------------------------------------------------
void emit_func_call(char *decl, DataType *t, ParmList *l, FILE *f) {
int i;
Parm *p;
// fprintf(f,"#line %d \"%s\"\n", line_number, input_file);
fprintf(f,"\t ");
// First check if there is a return value
if ((t->type != T_VOID) || (t->is_pointer)) {
if ((t->type == T_USER) && (!t->is_pointer)) {
// Special case for return by "value"
// Caution : This *will* cause a memory leak if not
// used properly.
if (CPlusPlus) {
fprintf(f,"_result = new %s(", t->print_type());
} else {
t->is_pointer++;
fprintf(f,"_result = %s malloc(sizeof(", t->print_cast());
t->is_pointer--;
fprintf(f,"%s));\n", t->print_type());
fprintf(f,"\t*(_result) = ");
}
} else {
// Check if this is a C++ reference
if (t->is_reference) {
t->is_pointer--;
fprintf(f,"%s& _result_ref = ", t->print_full());
t->is_pointer++;
} else {
// Normal return values
fprintf(f,"_result = %s", t->print_cast());
}
}
}
// Now print out function call
fprintf(f,"%s(",decl);
i = 0;
p = l->get_first();
while(p != 0) {
if ((p->t->type != T_VOID) || (p->t->is_pointer)){
fprintf(f,"%s",p->t->print_arraycast());
if ((!p->t->is_reference) && (p->call_type & CALL_VALUE)) fprintf(f,"&");
if ((!(p->call_type & CALL_VALUE)) &&
((p->t->is_reference) || (p->call_type & CALL_REFERENCE)))
fprintf(f,"*");
fprintf(f,"_arg%d",i);
i++;
}
p = l->get_next();
if (p != 0)
fprintf(f,",");
}
fprintf(f,")");
if ((t->type == T_USER) && (!t->is_pointer)) {
if (CPlusPlus) {
fprintf(f,")");
}
}
fprintf(f,";\n");
if (t->is_reference) {
fprintf(f,"\t _result = %s &_result_ref;\n", t->print_cast());
}
}
// -----------------------------------------------------------------------------
// int emit_func_call(char *decl, DataType *t, ParmList *l, WrapperFunction &f)
//
// Emits code for a function call (new version).
//
// Exception handling support :
//
// - This function checks to see if any sort of exception mechanism
// has been defined. If so, we emit the function call in an exception
// handling block.
//
// Inputs :
// decl = name of function
// t = Return datatype
// l = Parameter list
// f = WrapperFunction object
//
// Output : None
//
// Side Effects : None
//
// -----------------------------------------------------------------------------
void emit_func_call(char *decl, DataType *t, ParmList *l, WrapperFunction &f) {
int i;
Parm *p;
String fcall;
String exc;
char *tm;
// f.code << "#line " << line_number << " \"" << input_file << "\"\n";
fcall << tab4;
// First check if there is a return value
if ((t->type != T_VOID) || (t->is_pointer)) {
if ((t->type == T_USER) && (!t->is_pointer)) {
// Special case for return by "value"
// Caution : This *will* cause a memory leak if not
// used properly.
if (CPlusPlus) {
fcall << "_result = new " << t->print_type() << "(";
} else {
t->is_pointer++;
fcall << "_result = " << t->print_cast() << " malloc(sizeof(";
t->is_pointer--;
fcall << t->print_type() << "));\n";
fcall << tab4 << "*(_result) = ";
}
} else {
// Check if this is a C++ reference
if (t->is_reference) {
t->is_pointer--;
fcall << t->print_full() << "& _result_ref = ";
t->is_pointer++;
} else {
// Normal return value
fcall << "_result = " << t->print_cast();
}
}
}
// Now print out function call
fcall << decl << "(";
i = 0;
p = l->get_first();
while(p != 0) {
if ((p->t->type != T_VOID) || (p->t->is_pointer)){
fcall << p->t->print_arraycast();
if ((!p->t->is_reference) && (p->call_type & CALL_VALUE))
fcall << "&";
if ((!(p->call_type & CALL_VALUE)) &&
((p->t->is_reference) || (p->call_type & CALL_REFERENCE)))
fcall << "*";
fcall << emit_local(i);
i++;
}
p = l->get_next();
if (p != 0)
fcall << ",";
}
fcall << ")";
if ((t->type == T_USER) && (!t->is_pointer)) {
if (CPlusPlus) {
fcall << ")";
}
}
fcall << ";\n";
if (t->is_reference) {
fcall << tab4 << "_result = "<< t->print_cast() << " &_result_ref;\n";
}
// Check for exception handling
if ((tm = typemap_lookup("except",typemap_lang,t,decl,"_result",""))) {
// Found a type-specific mapping
exc << tm;
exc.replace("$function",fcall);
exc.replace("$name",decl);
f.code << exc;
} else if ((tm = fragment_lookup("except",typemap_lang, t->id))) {
exc << tm;
exc.replace("$function",fcall);
exc.replace("$name",decl);
f.code << exc;
} else {
f.code << fcall;
}
}
// -----------------------------------------------------------------------------
// void emit_hex(FILE *f)
//
// Emits the default C-code to handle pointers. This is normally contained
// in the SWIG library file 'swigptr.swg'
//
// Inputs : f = FILE handle
//
// Output : None
//
// Side Effects : None
// -----------------------------------------------------------------------------
void emit_hex(FILE *f) {
int stat;
// Look for a pointer configuration file
stat = insert_file("swigptr.swg", f);
if (stat == -1) {
fprintf(stderr,"** Fatal error. Unable to locate 'swigptr.swg'\n");
SWIG_exit(1);
}
}
// -----------------------------------------------------------------------------
// void emit_set_get(char *name, char *iname, DataType *type)
//
// Emits a pair of functions to set/get the value of a variable.
// This should be used as backup in case the target language can't
// provide variable linking.
//
// double foo;
//
// Gets translated into the following :
//
// double foo_set(double x) {
// return foo = x;
// }
//
// double foo_get() {
// return foo;
// }
//
// Need to handle special cases for char * and for user
// defined types.
//
// 1. char *
//
// Will free previous contents (if any) and allocate
// new storage. Could be risky, but it's a reasonably
// natural thing to do.
//
// 2. User_Defined
// Will assign value from a pointer.
// Will return a pointer to current value.
//
//
// Inputs :
// name = Name of variable
// iname = Renamed version of variable
// type = Datatype of the variable
//
// Output : None
//
// Side Effects : None
// -----------------------------------------------------------------------------
void emit_set_get(char *name, char *iname, DataType *t) {
Parm *p;
ParmList *l;
String new_name;
String new_iname;
String wname;
// First write a function to set the variable of the variable
if (!(Status & STAT_READONLY)) {
if ((t->type == T_USER) && (!t->is_pointer)) {
t->is_pointer++;
fprintf(f_header,"static %s %s(%s val) {\n",
t->print_type(), name_set(name), t->print_type());
t->is_pointer--;
} else {
fprintf(f_header,"static %s %s(%s val) {\n",
t->print_type(), name_set(name), t->print_type());
}
if ((t->type != T_VOID) || (t->is_pointer)) {
if (!t->is_pointer) {
// Have a real value here
// If it's a user defined type, we'll do something special.
// Otherwise, just assign it.
if (t->type != T_USER) {
fprintf(f_header,"\t return (%s) (%s = val);\n", t->print_type(), name);
} else {
fprintf(f_header,"\t %s = *(val);\n", name);
t->is_pointer++;
fprintf(f_header,"\t return (%s) &%s;\n", t->print_type(),name);
t->is_pointer--;
}
} else {
// Is a pointer type here. If string, we do something
// special. Otherwise. No problem.
if ((t->type == T_CHAR) && (t->is_pointer == 1)) {
if (CPlusPlus) {
fprintf(f_header,"\t if (%s) delete %s;\n", name,name);
fprintf(f_header,"\t %s = new char[strlen(val)+1];\n",name);
fprintf(f_header,"\t strcpy(%s,val);\n", name);
fprintf(f_header,"\t return %s;\n", name);
} else {
fprintf(f_header,"\t if (%s) free(%s);\n", name,name);
fprintf(f_header,"\t %s = (char *) malloc(strlen(val)+1);\n",name);
fprintf(f_header,"\t strcpy(%s,val);\n", name);
fprintf(f_header,"\t return %s;\n", name);
}
} else {
fprintf(f_header,"\t return (%s) (%s = val);\n", t->print_type(), name);
}
}
}
fprintf(f_header,"}\n");
// Now wrap it.
l = new ParmList;
p = new Parm(t,0);
if ((t->type == T_USER) && (!t->is_pointer)) p->t->is_pointer++;
p->name = new char[1];
p->name[0] = 0;
l->append(p);
new_name = name_set(name);
new_iname = name_set(iname);
if ((t->type == T_USER) && (!t->is_pointer)) {
t->is_pointer++;
lang->create_function(new_name, new_iname, t, l);
t->is_pointer--;
} else {
lang->create_function(new_name, new_iname, t, l);
}
delete l;
delete p;
if (doc_entry) doc_entry->usage << "\n";
}
// Now write a function to get the value of the variable
if ((t->type == T_USER) && (!t->is_pointer)) {
t->is_pointer++;
fprintf(f_header,"static %s %s() { \n",
t->print_type(), name_get(name));
fprintf(f_header,"\t return (%s) &%s;\n", t->print_type(), name);
t->is_pointer--;
} else {
fprintf(f_header,"static %s %s() { \n",
t->print_type(), name_get(name));
fprintf(f_header,"\t return (%s) %s;\n", t->print_type(), name);
}
fprintf(f_header,"}\n");
// Wrap this function
l = new ParmList;
new_name = name_get(name);
new_iname = name_get(iname);
if ((t->type == T_USER) && (!t->is_pointer)) {
t->is_pointer++;
lang->create_function(new_name, new_iname, t, l);
t->is_pointer--;
} else {
lang->create_function(new_name, new_iname, t, l);
}
delete l;
}
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