objc-gc-2.m   [plain text]

/* APPLE LOCAL file XJR */
/* A run-time test for insertion of write barriers. */
/* { dg-do run { target *-*-darwin* } } */
/* { dg-options "-fnext-runtime -fobjc-gc" } */

#include <objc/objc.h>

typedef const struct __CFDictionary * CFDictionaryRef;

// callouts to these are generated with cc -fobjc-gc

int GlobalAssigns;
int IvarAssigns;
int StrongCastAssigns;


id objc_assign_global(id value, id *dest) {
    ++GlobalAssigns;
    return (*dest = value);
}

id objc_assign_ivar(id value, id dest, unsigned int offset) {
    id *slot = (id*) ((char *)dest + offset);

    ++IvarAssigns;
    return (*slot = value);
}

id objc_assign_strongCast(id value, id *dest) {
    id base;

    ++StrongCastAssigns ;
    return (*dest = value);
}

// The test case elements;
@class NSObject;
@class NSString;

typedef struct {
    id  element;
    id elementArray[10];
    __strong CFDictionaryRef cfElement;
    __strong CFDictionaryRef cfElementArray[10];
} struct_with_ids_t;

@interface Foo  {
@public
// assignments to any/all of these fields should generate objc_assign_ivar
    __strong CFDictionaryRef dict;
    __strong CFDictionaryRef dictArray[3];
    id ivar;
    id array[10];
    NSObject *nsobject;
    NSString *stringArray[10];
    struct_with_ids_t inner;
}

@end

// assignments to these should generate objc_assign_global
id GlobalId;
id GlobalArray[20];
NSObject *GlobalObject;
NSObject *GlobalObjectArray[20];
__strong CFDictionaryRef Gdict;
__strong CFDictionaryRef Gdictarray[10];
struct_with_ids_t GlobalStruct;
struct_with_ids_t GlobalStructArray[10];


// The test cases
void *rhs = 0;

#define ASSIGNTEST(expr, global) expr = rhs; if (!global) { printf(# expr " is busted\n"); ++counter; }  global = 0;

int testGlobals() {
    // Everything in this function generates assign_global intercepts
    int counter = 0;

    static id staticGlobalId;
    static id staticGlobalArray[20];
    static NSObject *staticGlobalObject;
    static NSObject *staticGlobalObjectArray[20];
    static __strong CFDictionaryRef staticGdict;
    static __strong CFDictionaryRef staticGdictarray[10];
    static struct_with_ids_t staticGlobalStruct;
    static struct_with_ids_t staticGlobalStructArray[10];

    ASSIGNTEST(GlobalId, GlobalAssigns)				// objc_assign_global
    ASSIGNTEST(GlobalArray[0], GlobalAssigns)			// objc_assign_global
    ASSIGNTEST(GlobalObject, GlobalAssigns)			// objc_assign_global
    ASSIGNTEST(GlobalObjectArray[0], GlobalAssigns)		// objc_assign_global
    ASSIGNTEST(Gdict, GlobalAssigns)				// objc_assign_global
    ASSIGNTEST(Gdictarray[1], GlobalAssigns)			// objc_assign_global

    ASSIGNTEST(GlobalStruct.element, GlobalAssigns)		// objc_assign_global
    ASSIGNTEST(GlobalStruct.elementArray[0], GlobalAssigns)	// objc_assign_global
    ASSIGNTEST(GlobalStruct.cfElement, GlobalAssigns)		// objc_assign_global
    ASSIGNTEST(GlobalStruct.cfElementArray[0], GlobalAssigns)	// objc_assign_global

    ASSIGNTEST(staticGlobalId, GlobalAssigns)			// objc_assign_global
    ASSIGNTEST(staticGlobalArray[0], GlobalAssigns)		// objc_assign_global
    ASSIGNTEST(staticGlobalObject, GlobalAssigns)		// objc_assign_global
    ASSIGNTEST(staticGlobalObjectArray[0], GlobalAssigns)	// objc_assign_global
    ASSIGNTEST(staticGdict, GlobalAssigns)			// objc_assign_global
    ASSIGNTEST(staticGdictarray[1], GlobalAssigns)		// objc_assign_global

    ASSIGNTEST(staticGlobalStruct.element, GlobalAssigns)		// objc_assign_global
    ASSIGNTEST(staticGlobalStruct.elementArray[0], GlobalAssigns)	// objc_assign_global
    ASSIGNTEST(staticGlobalStruct.cfElement, GlobalAssigns)		// objc_assign_global
    ASSIGNTEST(staticGlobalStruct.cfElementArray[0], GlobalAssigns)	// objc_assign_global
    
    return counter;
}


int testIvars() {
    Foo *foo = (Foo *)malloc(sizeof(Foo)); // don't call in ObjC
    int counter = 0;
    
    ASSIGNTEST(foo->ivar, IvarAssigns)					// objc_assign_ivar
    ASSIGNTEST(foo->dict, IvarAssigns)					// objc_assign_ivar
    ASSIGNTEST(foo->dictArray[0], IvarAssigns)				// objc_assign_ivar
    ASSIGNTEST(foo->array[0], IvarAssigns)				// objc_assign_ivar
    ASSIGNTEST(foo->nsobject, IvarAssigns)				// objc_assign_ivar
    ASSIGNTEST(foo->stringArray[0], IvarAssigns)			// objc_assign_ivar
    ASSIGNTEST(foo->inner.element, IvarAssigns)				// objc_assign_ivar
    ASSIGNTEST(foo->inner.elementArray[0], IvarAssigns)			// objc_assign_ivar
    ASSIGNTEST(foo->inner.cfElement, IvarAssigns)			// objc_assign_ivar
    ASSIGNTEST(foo->inner.cfElementArray[0], IvarAssigns)		// objc_assign_ivar
    return counter;
}

int testStrongCasts() {
    id x = nil;
    int counter = 0;
    typedef struct { @defs(Foo) } Foo_defs;
    Foo_defs *foo = (Foo_defs *)malloc(sizeof(Foo));
    
    // strong casts should always be issued, even if the compiler could know better
    
    ASSIGNTEST((__strong id)foo->ivar, StrongCastAssigns)			// objc_assign_strongCast
    ASSIGNTEST((__strong id)foo->dict, StrongCastAssigns)			// objc_assign_strongCast
    ASSIGNTEST((__strong id)foo->dictArray[0], StrongCastAssigns)		// objc_assign_strongCast
    ASSIGNTEST((__strong id)foo->array[0], StrongCastAssigns)			// objc_assign_strongCast
    ASSIGNTEST((__strong id)foo->nsobject, StrongCastAssigns)			// objc_assign_strongCast
    ASSIGNTEST((__strong id)foo->stringArray[0], StrongCastAssigns)		// objc_assign_strongCast
    ASSIGNTEST((__strong id)foo->inner.element, StrongCastAssigns)		// objc_assign_strongCast
    ASSIGNTEST((__strong id)foo->inner.elementArray[0], StrongCastAssigns)	// objc_assign_strongCast
    ASSIGNTEST((__strong id)foo->inner.cfElement, StrongCastAssigns)		// objc_assign_strongCast
    ASSIGNTEST((__strong id)foo->inner.cfElementArray[0], StrongCastAssigns)	// objc_assign_strongCast
    
    
    // assignments to declared __strong on plain structure elements shouldn't work
    
    return counter;
}

@implementation Foo
@end

int main(int argc, char *argv[]) {
    int errors = 0;
    errors += testGlobals();
    errors += testIvars();
    errors += testStrongCasts();
    return(errors != 0);
}