invoke.texi: Document new switches -Wno-shadow-ivar, -fno-local-ivars and -fivar-visibility.

2014-05-12  Dimitris Papavasiliou  <dpapavas@gmail.com>

            * doc/invoke.texi: Document new switches -Wno-shadow-ivar,
            -fno-local-ivars and -fivar-visibility.
            * c-family/c.opt: Make -Wshadow also implicitly enable
            -Wshadow-ivar.

testsuite:
            * objc.dg/shadow-1.m: New test.
            * objc.dg/shadow-2.m: New test.
            * objc.dg/ivar-scope-1.m: New test.
            * objc.dg/ivar-scope-2.m: New test.
            * objc.dg/ivar-scope-3.m: New test.
            * objc.dg/ivar-scope-4.m: New test.
            * objc.dg/ivar-visibility-1.m: New test.
            * objc.dg/ivar-visibility-2.m: New test.
            * objc.dg/ivar-visibility-3.m: New test.
            * objc.dg/ivar-visibility-4.m: New test.

Now, actuatally add the files....

From-SVN: r210339

gcc/testsuite/objc.dg/ivar-scope-1.m

@@ -0,0 +1,24 @@
+/* Test instance variable scope.  */
+/* Author: Dimitris Papavasiliou <dpapavas@gmail.com>.  */
+/* { dg-do compile } */
+#include <objc/objc.h>
+
+@interface MyClass
+{
+  int someivar;
+}
+- (void) test;
+@end
+
+@implementation MyClass
+- (void) test
+{
+  int a;
+
+  /* Make sure instance variables do have local scope when
+     -fno-local-ivar isn't specified. */
+  
+  a = self->someivar;  /* No warning or error. */
+  a = someivar;        /* No error. */
+}
+@end

gcc/testsuite/objc.dg/ivar-scope-2.m

@@ -0,0 +1,34 @@
+/* Test instance variable scope.  */
+/* Author: Dimitris Papavasiliou <dpapavas@gmail.com>.  */
+/* { dg-do compile } */
+/* { dg-additional-options "-fno-local-ivars" } */
+#include <objc/objc.h>
+
+@interface MyClass
+{
+  int someivar;
+}
+- (void) testscope;
+- (void) testshadowing;
+@end
+
+@implementation MyClass
+- (void) testscope
+{
+  int a;
+
+  a = self->someivar;  /* No warning or error. */
+  a = someivar;        /* { dg-error ".someivar. undeclared" } */
+}
+
+- (void) testshadowing
+{
+  int someivar = 1;
+  int a;
+
+  /* Since instance variables don't have local scope no shadowing
+     should occur. */
+  
+  a = someivar; /* No warning. */
+}
+@end

gcc/testsuite/objc.dg/ivar-scope-3.m

@@ -0,0 +1,60 @@
+/* Test instance variable scope.  */
+/* Author: Dimitris Papavasiliou <dpapavas@gmail.com>.  */
+/* { dg-do run } */
+/* { dg-additional-options "-Wno-shadow-ivar" } */
+#include "../objc-obj-c++-shared/TestsuiteObject.m"
+#include <objc/objc.h>
+
+extern void abort(void);
+
+int someivar = 1;
+
+@interface MyClass: TestsuiteObject
+{
+  int someivar;
+}
+- (int) get;
+- (int) getHidden;
+@end
+
+@implementation MyClass
+- init
+{
+  someivar = 2;
+
+  return self;
+}
+
+- (int) get
+{
+  return someivar;
+}
+
+- (int) getHidden
+{
+  int someivar = 3;
+  
+  return someivar;
+}
+@end
+
+int main(void)
+{
+  MyClass *object;
+
+  object = [[MyClass alloc] init];
+
+  /* Check whether the instance variable hides the global variable. */
+  
+  if ([object get] != 2) {
+    abort();
+  }
+
+  /* Check whether the local variable hides the instance variable. */
+  
+  if ([object getHidden] != 3) {
+    abort();
+  }
+
+  return 0;
+}

gcc/testsuite/objc.dg/ivar-scope-4.m

@@ -0,0 +1,83 @@
+/* Test instance variable scope.  */
+/* Author: Dimitris Papavasiliou <dpapavas@gmail.com>.  */
+/* { dg-do run } */
+/* { dg-additional-options "-Wno-shadow-ivar -fno-local-ivars" } */
+#include "../objc-obj-c++-shared/runtime.h"
+#include <objc/objc.h>
+
+extern void abort(void);
+
+int someivar = 1;
+
+/* The testsuite object depends on local variable scope so we need to
+   implement our own minimal base object here. */
+
+@interface MyClass
+{
+  Class isa;
+  int someivar;
+}
+
++ (id) alloc;
+- (id) init;
+- (int) getGlobal;
+- (int) getInstance;
+- (int) getHidden;
+@end
+
+@implementation MyClass
++ (id) alloc
+{
+  return class_createInstance (self, 0);
+}
+
+- (id) init
+{
+  self->someivar = 2;
+
+  return self;
+}
+
+- (int) getGlobal
+{
+  return someivar;
+}
+
+- (int) getInstance
+{
+  return self->someivar;
+}
+
+- (int) getHidden
+{
+  int someivar = 3;
+  
+  return someivar;
+}
+@end
+
+int main(void)
+{
+  id object;
+
+  object = [[MyClass alloc] init];
+
+  /* Check for aliasing between instance variable and global
+     variable. */
+
+  if ([object getGlobal] != 1) {
+    abort();
+  }
+  
+  if ([object getInstance] != 2) {
+    abort();
+  }
+
+  /* Check whether the local variable hides the instance variable. */
+  
+  if ([object getHidden] != 3) {
+    abort();
+  }
+
+  return 0;
+}

gcc/testsuite/objc.dg/ivar-visibility-1.m

@@ -0,0 +1,33 @@
+/* Test instance variable visibility.  */
+/* Author: Dimitris Papavasiliou <dpapavas@gmail.com>.  */
+/* { dg-do compile } */
+#include <objc/objc.h>
+
+@interface MySuperClass
+{
+    int someivar;
+}
+@end
+
+@implementation MySuperClass
+@end
+
+
+@interface MyClass : MySuperClass 
+@end
+
+@implementation MyClass
+@end
+
+@interface MyOtherClass
+- (void) test: (MyClass *) object;
+@end
+
+@implementation MyOtherClass
+- (void) test: (MyClass *) object
+{
+  int a;
+
+  a = object->someivar;   /* { dg-error "instance variable .someivar. is declared protected" } */
+}
+@end

gcc/testsuite/objc.dg/ivar-visibility-2.m

@@ -0,0 +1,34 @@
+/* Test instance variable visibility.  */
+/* Author: Dimitris Papavasiliou <dpapavas@gmail.com>.  */
+/* { dg-do compile } */
+/* { dg-additional-options "-fivar-visibility=protected" } */
+#include <objc/objc.h>
+
+@interface MySuperClass
+{
+    int someivar;
+}
+@end
+
+@implementation MySuperClass
+@end
+
+
+@interface MyClass : MySuperClass 
+@end
+
+@implementation MyClass
+@end
+
+@interface MyOtherClass
+- (void) test: (MyClass *) object;
+@end
+
+@implementation MyOtherClass
+- (void) test: (MyClass *) object
+{
+  int a;
+
+  a = object->someivar;   /* { dg-error "instance variable .someivar. is declared protected" } */
+}
+@end

gcc/testsuite/objc.dg/ivar-visibility-3.m

@@ -0,0 +1,34 @@
+/* Test instance variable visibility.  */
+/* Author: Dimitris Papavasiliou <dpapavas@gmail.com>.  */
+/* { dg-do compile } */
+/* { dg-additional-options "-fivar-visibility=private" } */
+#include <objc/objc.h>
+
+@interface MySuperClass
+{
+    int someivar;
+}
+@end
+
+@implementation MySuperClass
+@end
+
+
+@interface MyClass : MySuperClass 
+@end
+
+@implementation MyClass
+@end
+
+@interface MyOtherClass
+- (void) test: (MyClass *) object;
+@end
+
+@implementation MyOtherClass
+- (void) test: (MyClass *) object
+{
+  int a;
+
+  a = object->someivar;   /* { dg-error "instance variable .someivar. is declared private" } */
+}
+@end

gcc/testsuite/objc.dg/ivar-visibility-4.m

@@ -0,0 +1,36 @@
+/* Test instance variable visibility.  */
+/* Author: Dimitris Papavasiliou <dpapavas@gmail.com>.  */
+/* { dg-do compile } */
+/* { dg-additional-options "-fivar-visibility=public" } */
+#include <objc/objc.h>
+
+@interface MySuperClass
+{
+    int someivar;
+}
+@end
+
+@implementation MySuperClass
+@end
+
+
+@interface MyClass : MySuperClass 
+@end
+
+@implementation MyClass
+@end
+
+@interface MyOtherClass
+- (void) test: (MyClass *) object;
+@end
+
+@implementation MyOtherClass
+- (void) test: (MyClass *) object
+{
+  int a;
+
+  /* someivar is public so we shouldn't get any errors here. */
+  
+  a = object->someivar;
+}
+@end

gcc/testsuite/objc.dg/shadow-1.m

@@ -0,0 +1,33 @@
+/* Test disabling of warnings for shadowing instance variables.  */
+/* Author: Dimitris Papavasiliou <dpapavas@gmail.com>.  */
+/* { dg-do compile } */
+/* { dg-additional-options "-Wno-shadow-ivar" } */
+#include <objc/objc.h>
+
+@interface MyClass
+{
+@private
+  int private;
+
+@protected
+  int protected;
+
+@public
+  int public;
+}
+- (void) test;
+@end
+
+@implementation MyClass
+- (void) test
+{
+  int private = 12;
+  int protected = 12;
+  int public = 12;
+  int a;
+  
+  a = private;    /* No warning. */
+  a = protected;  /* No warning. */
+  a = public;     /* No warning. */
+}
+@end

gcc/testsuite/objc.dg/shadow-2.m

@@ -0,0 +1,33 @@
+/* Test disabling of warnings for shadowing instance variables.  */
+/* Author: Dimitris Papavasiliou <dpapavas@gmail.com>.  */
+/* { dg-do compile } */
+/* { dg-additional-options "-Wno-shadow" } */
+#include <objc/objc.h>
+
+@interface MyClass
+{
+@private
+  int private;
+
+@protected
+  int protected;
+
+@public
+  int public;
+}
+- (void) test;
+@end
+
+@implementation MyClass
+- (void) test
+{
+  int private = 12;
+  int protected = 12;
+  int public = 12;
+  int a;
+  
+  a = private;    /* No warning. */
+  a = protected;  /* No warning. */
+  a = public;     /* No warning. */
+}
+@end