study_objc4/objc4-779.1/test/exc.m

/*
need exception-safe ARC for exception deallocation tests 
TEST_CFLAGS -fobjc-arc-exceptions -framework Foundation
*/

#include "test.h"
#include "testroot.i"
#include <objc/runtime.h>
#include <objc/objc-exception.h>

static volatile int state = 0;
static volatile int dealloced = 0;
#define BAD 1000000

#if defined(USE_FOUNDATION)

#include <Foundation/Foundation.h>

@interface Super : NSException @end
@implementation Super
+(id)exception { return AUTORELEASE([[self alloc] initWithName:@"Super" reason:@"reason" userInfo:nil]);  }
-(void)check { state++; }
+(void)check { testassert(!"caught class object, not instance"); }
-(void)dealloc { dealloced++; SUPER_DEALLOC(); }
@end

#define FILENAME "nsexc.m"

#else

@interface Super : TestRoot @end
@implementation Super
+(id)exception { return AUTORELEASE([self new]); }
-(void)check { state++; }
+(void)check { testassert(!"caught class object, not instance"); }
-(void)dealloc { dealloced++; SUPER_DEALLOC(); }
@end

#define FILENAME "exc.m"

#endif

@interface Sub : Super @end
@implementation Sub 
@end


#if TARGET_OS_OSX
void altHandlerFail(id unused __unused, void *context __unused)
{
    fail("altHandlerFail called");
}

#define ALT_HANDLER(n)                                          \
    void altHandler##n(id unused __unused, void *context)       \
    {                                                           \
        testassert(context == (void*)&altHandler##n);           \
        testassert(state == n);                                 \
        state++;                                                \
    }

ALT_HANDLER(1)
ALT_HANDLER(2)
ALT_HANDLER(3)
ALT_HANDLER(4)
ALT_HANDLER(5)
ALT_HANDLER(6)
ALT_HANDLER(7)


static void throwWithAltHandler(void) __attribute__((noinline, used));
static void throwWithAltHandler(void)
{
    @try {
        state++;
        uintptr_t token = objc_addExceptionHandler(altHandler3, (void*)altHandler3);
        // state++ inside alt handler
        @throw [Super exception];
        state = BAD;
        objc_removeExceptionHandler(token);
    } 
    @catch (Sub *e) {
        state = BAD;
    }
    state = BAD;
}


static void throwWithAltHandlerAndRethrow(void) __attribute__((noinline, used));
static void throwWithAltHandlerAndRethrow(void)
{
    @try {
        state++;
        uintptr_t token = objc_addExceptionHandler(altHandler3, (void*)altHandler3);
        // state++ inside alt handler
        @throw [Super exception];
        state = BAD;
        objc_removeExceptionHandler(token);
    } 
    @catch (...) {
        testassert(state == 4);
        state++;
        @throw;
    }
    state = BAD;
}

#endif

#if __cplusplus
#include <exception>
void terminator() {
    succeed(FILENAME);    
}
#endif


#define TEST(code)                                              \
    do {                                                        \
        testonthread(^{ PUSH_POOL { code } POP_POOL; });        \
        testcollect();                                          \
    } while (0)



int main()
{
    testprintf("try-catch-finally, exception caught exactly\n");
    
    TEST({
        state = 0;
        dealloced = 0;
        @try {
            state++;
            @try {
                state++;
                @throw [Super exception];
                state = BAD;
            } 
            @catch (Super *e) {
                state++;
                [e check];  // state++
            }
            @finally {
                state++;
            }
            state++;
        } 
        @catch (...) {
            state = BAD;
        }
    });
    testassert(state == 6);
    testassert(dealloced == 1);


    testprintf("try-finally, no exception thrown\n");
    
    TEST({
        state = 0;
        dealloced = 0;
        @try {
            state++;
            @try {
                state++;
            } 
            @finally {
                state++;
            }
            state++;
        } 
        @catch (...) {
            state = BAD;
        }
    });
    testassert(state == 4);
    testassert(dealloced == 0);
    
    
    testprintf("try-finally, with exception\n");
    
    TEST({
        state = 0;
        dealloced = 0;
        @try {
            state++;
            @try {
                state++;
                @throw [Super exception];
                state = BAD;
            } 
            @finally {
                state++;
            }
            state = BAD;
        } 
        @catch (id e) {
            state++;
            [e check];  // state++
        }
    });
    testassert(state == 5);
    testassert(dealloced == 1);


    testprintf("try-finally, with autorelease pool pop during unwind\n");
    // Popping an autorelease pool during unwind used to deallocate the 
    // exception object, but now we retain them while in flight.

    // This use-after-free is undetected without MallocScribble or guardmalloc.
    if (!getenv("MallocScribble")  &&  
        (!getenv("DYLD_INSERT_LIBRARIES")  || 
         !strstr(getenv("DYLD_INSERT_LIBRARIES"), "libgmalloc"))) 
    {
        testwarn("MallocScribble not set");
    }

    TEST({
        state = 0;
        dealloced = 0;
        @try {
            void *pool2 = objc_autoreleasePoolPush();
            state++;
            @try {
                state++;
                @throw [Super exception];
                state = BAD;
            } 
            @finally {
                state++;
                objc_autoreleasePoolPop(pool2);
            }
            state = BAD;
        } 
        @catch (id e) {
            state++;
            [e check];  // state++
        }
    });
    testassert(state == 5);
    testassert(dealloced == 1);

    
    testprintf("try-catch-finally, no exception\n");
    
    TEST({
        state = 0;
        dealloced = 0;
        @try {
            state++;
            @try {
                state++;
            } 
            @catch (...) {
                state = BAD;
            }
            @finally {
                state++;
            }
            state++;
        } @catch (...) {
            state = BAD;
        }
    });
    testassert(state == 4);
    testassert(dealloced == 0);
    
    
    testprintf("try-catch-finally, exception not caught\n");
    
    TEST({
        state = 0;
        dealloced = 0;
        @try {
            state++;
            @try {
                state++;
                @throw [Super exception];
                state = BAD;
            } 
            @catch (Sub *e) {
                state = BAD;
            }
            @finally {
                state++;
            }
            state = BAD;
        } 
        @catch (id e) {
            state++;
            [e check];  // state++
        }
    });
    testassert(state == 5);
    testassert(dealloced == 1);
    
    
    testprintf("try-catch-finally, exception caught exactly, rethrown\n");
    
    TEST({
        state = 0;
        dealloced = 0;
        @try {
            state++;
            @try {
                state++;
                @throw [Super exception];
                state = BAD;
            } 
            @catch (Super *e) {
                state++;
                [e check];  // state++
                @throw;
                state = BAD;
            }
            @finally {
                state++;
            }
            state = BAD;
        } 
        @catch (id e) {
            state++;
            [e check];  // state++
        }
    });
    testassert(state == 7);
    testassert(dealloced == 1);
    
        
    testprintf("try-catch, no exception\n");
    
    TEST({
        state = 0;
        dealloced = 0;
        @try {
            state++;
            @try {
                state++;
            } 
            @catch (...) {
                state = BAD;
            }
            state++;
        } @catch (...) {
            state = BAD;
        }
    });
    testassert(state == 3);
    testassert(dealloced == 0);

    
    testprintf("try-catch, exception not caught\n");
    
    TEST({
        state = 0;
        dealloced = 0;
        @try {
            state++;
            @try {
                state++;
                @throw [Super exception];
                state = BAD;
            } 
            @catch (Sub *e) {
                state = BAD;
            }
            state = BAD;
        } 
        @catch (id e) {
            state++;
            [e check];  // state++
        }
    });
    testassert(state == 4);
    testassert(dealloced == 1);
    
    
    testprintf("try-catch, exception caught exactly\n");

    TEST({
        state = 0;
        dealloced = 0;
        @try {
            state++;
            @try {
                state++;
                @throw [Super exception];
                state = BAD;
            } 
            @catch (Super *e) {
                state++;
                [e check];  // state++
            }
            state++;
        } 
        @catch (...) {
            state = BAD;
        }
    });
    testassert(state == 5);
    testassert(dealloced == 1);
    
    
    testprintf("try-catch, exception caught exactly, rethrown\n");
    
    TEST({
        state = 0;
        dealloced = 0;
        @try {
            state++;
            @try {
                state++;
                @throw [Super exception];
                state = BAD;
            } 
            @catch (Super *e) {
                state++;
                [e check];  // state++
                @throw;
                state = BAD;
            }
            state = BAD;
        } 
        @catch (id e) {
            state++;
            [e check];  // state++
        }
    });
    testassert(state == 6);
    testassert(dealloced == 1);

    
    testprintf("try-catch, exception caught exactly, thrown again explicitly\n");

    TEST({
        state = 0;
        dealloced = 0;
        @try {
            state++;
            @try {
                state++;
                @throw [Super exception];
                state = BAD;
            } 
            @catch (Super *e) {
                state++;
                [e check];  // state++
                @throw e;
                state = BAD;
            }
            state = BAD;
        } 
        @catch (id e) {
            state++;
            [e check];  // state++
        }
    });
    testassert(state == 6);
    testassert(dealloced == 1);
    
    
    testprintf("try-catch, default catch, rethrown\n");
    
    TEST({
        state = 0;
        dealloced = 0;
        @try {
            state++;
            @try {
                state++;
                @throw [Super exception];
                state = BAD;
            } 
            @catch (...) {
                state++;
                @throw;
                state = BAD;
            }
            state = BAD;
        } 
        @catch (id e) {
            state++;
            [e check];  // state++
        }
    });
    testassert(state == 5);
    testassert(dealloced == 1);
    
    
    testprintf("try-catch, default catch, rethrown and caught inside nested handler\n");
    
    TEST({
        state = 0;
        dealloced = 0;
        @try {
            state++;
            @try {
                state++;
                @throw [Super exception];
                state = BAD;
            } 
            @catch (...) {
                state++;
                
                @try {
                    state++;
                    @throw;
                    state = BAD;
                } @catch (Sub *e) {
                    state = BAD;
                } @catch (Super *e) {
                    state++;
                    [e check];  // state++
                } @catch (...) {
                    state = BAD;
                } @finally {
                    state++;
                }
                
                state++;
            }
            state++;
        } 
        @catch (...) {
            state = BAD;
        }
    });
    testassert(state == 9);
    testassert(dealloced == 1);
    
    
    testprintf("try-catch, default catch, rethrown inside nested handler but not caught\n");
    
    TEST({
        state = 0;
        dealloced = 0;
        @try {
            state++;
            @try {
                state++;
                @throw [Super exception];
                state = BAD;
            } 
            @catch (...) {
                state++;
                
                @try {
                    state++;
                    @throw;
                    state = BAD;
                } 
                @catch (Sub *e) {
                    state = BAD;
                } 
                @finally {
                    state++;
                }
                
                state = BAD;
            }
            state = BAD;
        } 
        @catch (id e) {
            state++;
            [e check];  // state++
        }
    });
    testassert(state == 7);
    testassert(dealloced == 1);
    
    
#if __cplusplus
    testprintf("C++ try/catch, Objective-C exception superclass\n");
    
    TEST({
        state = 0;
        dealloced = 0;
        try {
            state++;
            try {
                state++;
                try {
                    state++;
                    @throw [Super exception];
                    state = BAD;
                } catch (...) {
                    state++;
                    throw;
                    state = BAD;
                }
                state = BAD;
            } catch (void *e) {
                state = BAD;
            } catch (int e) {
                state = BAD;
            } catch (Sub *e) {
                state = BAD;
            } catch (Super *e) {
                state++;
                [e check];  // state++
                throw;
            } catch (...) {
                state = BAD;
            }
        } catch (id e) {
            state++;
            [e check];  // state++;
        }
    });
    testassert(state == 8);
    testassert(dealloced == 1);
    
    
    testprintf("C++ try/catch, Objective-C exception subclass\n");
    
    TEST({
        state = 0;
        dealloced = 0;
        try {
            state++;
            try {
                state++;
                try {
                    state++;
                    @throw [Sub exception];
                    state = BAD;
                } catch (...) {
                    state++;
                    throw;
                    state = BAD;
                }
                state = BAD;
            } catch (void *e) {
                state = BAD;
            } catch (int e) {
                state = BAD;
            } catch (Super *e) {
                state++;
                [e check];  // state++
                throw;
            } catch (Sub *e) {
                state = BAD;
            } catch (...) {
                state = BAD;
            }
        } catch (id e) {
            state++;
            [e check];  // state++;
        }
    });
    testassert(state == 8);
    testassert(dealloced == 1);

#endif        
        
        
#if !TARGET_OS_OSX
        // alt handlers are for macOS only
#else
    {
        // alt handlers
        // run a lot to catch failed unregistration (runtime complains at 1000)
#define ALT_HANDLER_REPEAT 2000
        
        testprintf("alt handler, no exception\n");
        
        TEST({
            dealloced = 0;
            for (int i = 0; i < ALT_HANDLER_REPEAT; i++) {
                state = 0;
                @try {
                    state++;
                    @try {
                        uintptr_t token = objc_addExceptionHandler(altHandlerFail, 0);
                        state++;
                        objc_removeExceptionHandler(token);
                    } 
                    @catch (...) {
                        state = BAD;
                    }
                    state++;
                } @catch (...) {
                    state = BAD;
                }
                testassert(state == 3);
            }
        });
        testassert(dealloced == 0);
        
        
        testprintf("alt handler, exception thrown through\n");
        
        TEST({
            dealloced = 0;
            for (int i = 0; i < ALT_HANDLER_REPEAT; i++) {
                state = 0;
                @try {
                    state++;
                    @try {
                        state++;
                        uintptr_t token = objc_addExceptionHandler(altHandler2, (void*)altHandler2);
                        // state++ inside alt handler
                        @throw [Super exception];
                        state = BAD;
                        objc_removeExceptionHandler(token);
                    } 
                    @catch (Sub *e) {
                        state = BAD;
                    }
                    state = BAD;
                } 
                @catch (id e) {
                    testassert(state == 3);
                    state++;
                    [e check];  // state++
                }
                testassert(state == 5);
            }
        });
        testassert(dealloced == ALT_HANDLER_REPEAT);
        
        
        testprintf("alt handler, nested\n");
#if 1
        testwarn("fixme compiler no longer cooperative for local nested?");
        // Nested alt handlers inside the same function require that each
        // catch group have its own landing pad descriptor. The compiler is
        // probably not doing that anymore. For now we assume that the
        // combination of nested exception handlers and alt handlers is
        // rare enough that nobody cares.
#else
        TEST({
            dealloced = 0;
            for (int i = 0; i < ALT_HANDLER_REPEAT; i++) {
                state = 0;
                @try {
                    state++;
                    @try {
                        state++;
                        // same-level handlers called in FIFO order (not stack-like)
                        uintptr_t token = objc_addExceptionHandler(altHandler4, (void*)altHandler4);
                        // state++ inside alt handler
                        uintptr_t token2 = objc_addExceptionHandler(altHandler5, (void*)altHandler5);
                        // state++ inside alt handler
                        throwWithAltHandler();  // state += 2 inside
                        state = BAD;
                        objc_removeExceptionHandler(token);
                        objc_removeExceptionHandler(token2);
                    }
                    @catch (id e) {
                        testassert(state == 6);
                        state++;
                        [e check];  // state++;
                    }
                    state++;
                } 
                @catch (...) {
                    state = BAD;
                }
                testassert(state == 9);
            }
        });
        testassert(dealloced == ALT_HANDLER_REPEAT);
#endif
        
        testprintf("alt handler, nested, rethrows in between\n");
#if 1
        testwarn("fixme compiler no longer cooperative for local nested?");
        // See above.
#else
        TEST({
            dealloced = 0;
            for (int i = 0; i < ALT_HANDLER_REPEAT; i++) {
                state = 0;
                @try {
                    state++;
                    @try {
                        state++;
                        // same-level handlers called in FIFO order (not stack-like)
                        uintptr_t token = objc_addExceptionHandler(altHandler5, (void*)altHandler5);
                        // state++ inside alt handler
                        uintptr_t token2 = objc_addExceptionHandler(altHandler6, (void*)altHandler6);
                        // state++ inside alt handler
                        throwWithAltHandlerAndRethrow();  // state += 3 inside
                        state = BAD;
                        objc_removeExceptionHandler(token);
                        objc_removeExceptionHandler(token2);
                    }
                    @catch (...) {
                        testassert(state == 7);
                        state++;
                        @throw;
                    }
                    state = BAD;
                } 
                @catch (id e) {
                    testassert(state == 8);
                    state++;
                    [e check];  // state++
                }
                testassert(state == 10);
            }
        });
        testassert(dealloced == ALT_HANDLER_REPEAT);
#endif
        
        testprintf("alt handler, exception thrown and caught inside\n");
        
        TEST({
            dealloced = 0;
            for (int i = 0; i < ALT_HANDLER_REPEAT; i++) {
                state = 0;
                @try {
                    state++;
                    uintptr_t token = objc_addExceptionHandler(altHandlerFail, 0);
                    @try {
                        state++;
                        @throw [Super exception];
                        state = BAD;
                    } 
                    @catch (Super *e) {
                        state++;
                        [e check];  // state++
                    }
                    state++;
                    objc_removeExceptionHandler(token);
                } 
                @catch (...) {
                    state = BAD;
                }
                testassert(state == 5);
            }
        });
        testassert(dealloced == ALT_HANDLER_REPEAT);


#if defined(USE_FOUNDATION)
        testprintf("alt handler, rdar://10055775\n");
        
        TEST({
            dealloced = 0;
            for (int i = 0; i < ALT_HANDLER_REPEAT; i++) {
                state = 0;
                @try {
                    uintptr_t token = objc_addExceptionHandler(altHandler1, (void*)altHandler1);
                    {
                        id x = [NSArray array];
                        x = [NSArray array];
                    }
                    state++;
                    // state++ inside alt handler
                    [Super raise:@"foo" format:@"bar"];
                    state = BAD;
                    objc_removeExceptionHandler(token);
                } @catch (id e) {
                    state++;
                    testassert(state == 3);
                }
                testassert(state == 3);
            }
        });
        testassert(dealloced == ALT_HANDLER_REPEAT);

// defined(USE_FOUNDATION)
#endif

    }
// alt handlers
#endif

#if __cplusplus
    std::set_terminate(terminator);
    objc_terminate();
    fail("should not have returned from objc_terminate()");
#else
    succeed(FILENAME);
#endif
}