PR c/82063 - issues with arguments enabled by -Wall

gcc/c-family/ChangeLog:

	PR c/82063
	* c.opt (-Wno-alloc-size-larger-than): New option.
	* doc/invoke.texi (-Walloc-size-larger-than): Update.

gcc/ChangeLog:

	PR c/82063
	* calls.c (alloc_max_size): Correct a logic error/typo.
	Treat excessive arguments as infinite.  Warn for invalid arguments.

gcc/testsuite/ChangeLog:

	PR c/82063
	* gcc.dg/Walloc-size-larger-than-1.c: New test.
	* gcc.dg/Walloc-size-larger-than-10.c: New test.
	* gcc.dg/Walloc-size-larger-than-11.c: New test.
	* gcc.dg/Walloc-size-larger-than-12.c: New test.
	* gcc.dg/Walloc-size-larger-than-13.c: New test.
	* gcc.dg/Walloc-size-larger-than-14.c: New test.
	* gcc.dg/Walloc-size-larger-than-15.c: New test.
	* gcc.dg/Walloc-size-larger-than-16.c: New test.
	* gcc.dg/Walloc-size-larger-than-17.c: New test.
	* gcc.dg/Walloc-size-larger-than-2.c: New test.
	* gcc.dg/Walloc-size-larger-than-3.c: New test.
	* gcc.dg/Walloc-size-larger-than-4.c: New test.
	* gcc.dg/Walloc-size-larger-than-5.c: New test.
	* gcc.dg/Walloc-size-larger-than-6.c: New test.
	* gcc.dg/Walloc-size-larger-than-7.c: New test.
	* gcc.dg/Walloc-size-larger-than-8.c: New test.
	* gcc.dg/Walloc-size-larger-than-9.c: New test.
	* gcc.dg/Walloc-size-larger-than.c: New test.

From-SVN: r261030

gcc/ChangeLog

+2018-05-31  Martin Sebor  <msebor@redhat.com>
+
+	PR c/82063
+	* calls.c (alloc_max_size): Correct a logic error/typo.
+	Treat excessive arguments as infinite.  Warn for invalid arguments.
+	* doc/invoke.texi (-Walloc-size-larger-than): Update.
+
 2018-05-31  H.J. Lu  <hongjiu.lu@intel.com>
 
 	PR target/85829

gcc/c-family/ChangeLog

+2018-05-31  Martin Sebor  <msebor@redhat.com>
+
+	PR c/82063
+	* c.opt (-Wno-alloc-size-larger-than): New option.
+
 2018-04-22  David Pagan  <dave.pagan@oracle.com>
 
 	PR c/55976

gcc/c-family/c.opt

@@ -308,6 +308,10 @@ C ObjC C++ LTO ObjC++ Var(warn_alloc_size_limit) Warning Joined LangEnabledBy(C
 -Walloc-size-larger-than=<bytes> Warn for calls to allocation functions that
 attempt to allocate objects larger than the specified number of bytes.
 
+Wno-alloc-size-larger-than
+C ObjC C++ LTO ObjC++ Alias(Walloc-size-larger-than=, 18446744073709551615EiB,none) Warning
+-Wno-alloc-size-larger-than Disable Walloc-size-larger-than= warning.  Equivalent to Walloc-size-larger-than=<SIZE_MAX> or larger.
+
 Walloc-zero
 C ObjC C++ ObjC++ Var(warn_alloc_zero) Warning
 -Walloc-zero Warn for calls to allocation functions that specify zero bytes.

gcc/calls.c

@@ -1231,20 +1231,26 @@ static GTY(()) tree alloc_object_size_limit;
 static tree
 alloc_max_size (void)
 {
-  if (!alloc_object_size_limit)
-    {
+  if (alloc_object_size_limit)
+    return alloc_object_size_limit;
+
   alloc_object_size_limit = max_object_size ();
 
-      if (warn_alloc_size_limit)
-	{
+  if (!warn_alloc_size_limit)
+    return alloc_object_size_limit;
+
+  const char *optname = "-Walloc-size-larger-than=";
+
   char *end = NULL;
   errno = 0;
   unsigned HOST_WIDE_INT unit = 1;
   unsigned HOST_WIDE_INT limit
     = strtoull (warn_alloc_size_limit, &end, 10);
 
-	  if (!errno)
-	    {
+  /* If the value is too large to be represented use the maximum
+     representable value that strtoull sets limit to (setting
+     errno to ERANGE).  */
+
   if (end && *end)
     {
       /* Numeric option arguments are at most INT_MAX.  Make it
@@ -1252,7 +1258,7 @@ alloc_max_size (void)
 	 suffixes.  */
       if (!strcmp (end, "kB"))
 	unit = 1000;
-		  else if (!strcasecmp (end, "KiB") || strcmp (end, "KB"))
+      else if (!strcasecmp (end, "KiB") || !strcmp (end, "KB"))
 	unit = 1024;
       else if (!strcmp (end, "MB"))
 	unit = HOST_WIDE_INT_UC (1000) * 1000;
@@ -1277,8 +1283,17 @@ alloc_max_size (void)
 	unit = HOST_WIDE_INT_UC (1024) * 1024 * 1024 * 1024 * 1024
 	  * 1024;
       else
+	{
+	  /* This could mean an unknown suffix or a bad prefix, like
+	     "+-1".  */
+	  warning_at (UNKNOWN_LOCATION, 0,
+		      "invalid argument %qs to %qs",
+		      warn_alloc_size_limit, optname);
+
+	  /* Ignore the limit extracted by strtoull.  */
 	  unit = 0;
 	}
+    }
 
   if (unit)
     {
@@ -1286,10 +1301,11 @@ alloc_max_size (void)
       if (w < wi::to_widest (alloc_object_size_limit))
 	alloc_object_size_limit
 	  = wide_int_to_tree (ptrdiff_type_node, w);
+      else
+	alloc_object_size_limit = build_all_ones_cst (size_type_node);
     }
-	    }
-	}
-    }
+
+
   return alloc_object_size_limit;
 }
 

gcc/doc/invoke.texi

@@ -5510,10 +5510,14 @@ portability bugs and should be avoided.
 Warn about calls to functions decorated with attribute @code{alloc_size}
 that attempt to allocate objects larger than the specified number of bytes,
 or where the result of the size computation in an integer type with infinite
-precision would exceed @code{SIZE_MAX / 2}.  The option argument @var{n}
-may end in one of the standard suffixes designating a multiple of bytes
-such as @code{kB} and @code{KiB} for kilobyte and kibibyte, respectively,
-@code{MB} and @code{MiB} for megabyte and mebibyte, and so on.
+precision would exceed @code{SIZE_MAX / 2}.  The option argument @var{n} is
+treated as an integer with infinite precision and may end in one of
+the standard suffixes designating a multiple of bytes such as @code{kB} and
+@code{KiB} for kilobyte and kibibyte, respectively, @code{MB} and @code{MiB}
+for megabyte and mebibyte, and so on.
+@option{-Walloc-size-larger-than=}@var{PTRDIFF_MAX} is enabled by default.
+Warnings controlled by the option can be disabled either by specifying
+@var{n} of @var{SIZE_MAX} or more or by @option{-Wno-alloc-size-larger-than}.
 @xref{Function Attributes}.
 
 @item -Walloca

gcc/testsuite/ChangeLog

+2018-05-31  Martin Sebor  <msebor@redhat.com>
+
+	PR c/82063
+	* gcc.dg/Walloc-size-larger-than-1.c: New test.
+	* gcc.dg/Walloc-size-larger-than-10.c: New test.
+	* gcc.dg/Walloc-size-larger-than-11.c: New test.
+	* gcc.dg/Walloc-size-larger-than-12.c: New test.
+	* gcc.dg/Walloc-size-larger-than-13.c: New test.
+	* gcc.dg/Walloc-size-larger-than-14.c: New test.
+	* gcc.dg/Walloc-size-larger-than-15.c: New test.
+	* gcc.dg/Walloc-size-larger-than-16.c: New test.
+	* gcc.dg/Walloc-size-larger-than-17.c: New test.
+	* gcc.dg/Walloc-size-larger-than-2.c: New test.
+	* gcc.dg/Walloc-size-larger-than-3.c: New test.
+	* gcc.dg/Walloc-size-larger-than-4.c: New test.
+	* gcc.dg/Walloc-size-larger-than-5.c: New test.
+	* gcc.dg/Walloc-size-larger-than-6.c: New test.
+	* gcc.dg/Walloc-size-larger-than-7.c: New test.
+	* gcc.dg/Walloc-size-larger-than-8.c: New test.
+	* gcc.dg/Walloc-size-larger-than-9.c: New test.
+	* gcc.dg/Walloc-size-larger-than.c: New test.
+
 2018-05-31  Chung-Lin Tang  <cltang@codesourcery.com>
 	    Cesar Philippidis  <cesar@codesourcery.com>
 

gcc/testsuite/gcc.dg/Walloc-size-larger-than-1.c

+/* PR middle-end/82063 - issues with arguments enabled by -Wall
+   { dg-do compile }
+   { dg-options "-O -Walloc-size-larger-than=1KB -ftrack-macro-expansion=0" } */
+
+void sink (void*);
+
+#define T(x) sink (x)
+
+void f (void)
+{
+  unsigned n = 0;
+  T (__builtin_malloc (n));
+
+  n = 1024;   /* 1 kibibyte (KB or KiB) */
+  T (__builtin_malloc (n));
+
+  n = 1025;
+  T (__builtin_malloc (n));   /* { dg-warning "argument 1 value .1025. exceeds maximum object size 1024" } */
+}

gcc/testsuite/gcc.dg/Walloc-size-larger-than-10.c

+/* PR middle-end/82063 - issues with arguments enabled by -Wall
+   { dg-do compile { target lp64 } }
+   { dg-options "-O -Walloc-size-larger-than=1PiB -ftrack-macro-expansion=0" } */
+
+typedef __SIZE_TYPE__ size_t;
+
+void sink (void*);
+
+#define T(x) sink (x)
+
+void f (void)
+{
+  size_t n = 0;
+  T (__builtin_malloc (n));
+
+  n = (size_t)1024 * 1024 * 1024 * 1024 * 1024;   /* 1 pebibyte (PiB) */
+  T (__builtin_malloc (n));
+
+  n += 1;
+  T (__builtin_malloc (n));   /* { dg-warning "argument 1 value .1125899906842625. exceeds maximum object size 1125899906842624" } */
+
+  n = __PTRDIFF_MAX__;
+  T (__builtin_malloc (n));   /* { dg-warning "exceeds maximum object size" } */
+
+  n = __SIZE_MAX__;
+  T (__builtin_malloc (n));   /* { dg-warning "exceeds maximum object size" } */
+}

gcc/testsuite/gcc.dg/Walloc-size-larger-than-11.c

+/* PR middle-end/82063 - issues with arguments enabled by -Wall
+   { dg-do compile { target lp64 } }
+   { dg-options "-O -Walloc-size-larger-than=1PB -ftrack-macro-expansion=0" } */
+
+typedef __SIZE_TYPE__ size_t;
+
+void sink (void*);
+
+#define T(x) sink (x)
+
+void f (void)
+{
+  size_t n = 0;
+  T (__builtin_malloc (n));
+
+  n = (size_t)1000 * 1000 * 1000 * 1000 * 1000;   /* 1 petabyte (PB) */
+  T (__builtin_malloc (n));
+
+  n += 1;
+  T (__builtin_malloc (n));   /* { dg-warning "argument 1 value .1000000000000001. exceeds maximum object size 1000000000000000" } */
+
+  n = __PTRDIFF_MAX__;
+  T (__builtin_malloc (n));   /* { dg-warning "exceeds maximum object size" } */
+
+  n = __SIZE_MAX__;
+  T (__builtin_malloc (n));   /* { dg-warning "exceeds maximum object size" } */
+}

gcc/testsuite/gcc.dg/Walloc-size-larger-than-12.c

+/* PR middle-end/82063 - issues with arguments enabled by -Wall
+   { dg-do compile { target lp64 } }
+   { dg-options "-O -Walloc-size-larger-than=1EiB -ftrack-macro-expansion=0" } */
+
+typedef __SIZE_TYPE__ size_t;
+
+void sink (void*);
+
+#define T(x) sink (x)
+
+void f (void)
+{
+  size_t n = 0;
+  T (__builtin_malloc (n));
+
+  n = (size_t)1024 * 1024 * 1024 * 1024 * 1024 * 1024;   /* 1 exbibyte (EiB) */
+  T (__builtin_malloc (n));
+
+  n += 1;
+  T (__builtin_malloc (n));   /* { dg-warning "argument 1 value .1152921504606846977. exceeds maximum object size 1152921504606846976" } */
+
+  n = __PTRDIFF_MAX__;
+  T (__builtin_malloc (n));   /* { dg-warning "exceeds maximum object size" } */
+
+  n = __SIZE_MAX__;
+  T (__builtin_malloc (n));   /* { dg-warning "exceeds maximum object size" } */
+}

gcc/testsuite/gcc.dg/Walloc-size-larger-than-13.c

+/* PR middle-end/82063 - issues with arguments enabled by -Wall
+   { dg-do compile { target lp64 } }
+   { dg-options "-O -Walloc-size-larger-than=1EB -ftrack-macro-expansion=0" } */
+
+typedef __SIZE_TYPE__ size_t;
+
+void sink (void*);
+
+#define T(x) sink (x)
+
+void f (void)
+{
+  size_t n = 0;
+  T (__builtin_malloc (n));
+
+  n = (size_t)1000 * 1000 * 1000 * 1000 * 1000 * 1000;   /* 1 exabyte (EB) */
+  T (__builtin_malloc (n));
+
+  n += 1;
+  T (__builtin_malloc (n));   /* { dg-warning "argument 1 value .1000000000000000001. exceeds maximum object size 1000000000000000000" } */
+
+  n = __PTRDIFF_MAX__;
+  T (__builtin_malloc (n));   /* { dg-warning "exceeds maximum object size" } */
+
+  n = __SIZE_MAX__;
+  T (__builtin_malloc (n));   /* { dg-warning "exceeds maximum object size" } */
+}

gcc/testsuite/gcc.dg/Walloc-size-larger-than-14.c

+/* PR middle-end/82063 - issues with arguments enabled by -Wall
+   { dg-do compile }
+   { dg-options "-O -Walloc-size-larger-than=123456789123456789123456789123456789 -ftrack-macro-expansion=0" } */
+
+typedef __SIZE_TYPE__ size_t;
+
+void sink (void*);
+
+#define T(x) sink (x)
+
+/* Verify that an exceedingly large -Walloc-size-larger-than argument
+   with no suffix is accepted and treated as infinite.  */
+
+void f (void)
+{
+  size_t n = 0;
+  T (__builtin_malloc (n));
+
+  n = __PTRDIFF_MAX__;
+  T (__builtin_malloc (n));
+
+  n += 1;
+  T (__builtin_malloc (n));
+
+  n = __SIZE_MAX__ - 1;
+  T (__builtin_malloc (n));
+
+  n = __SIZE_MAX__;
+  T (__builtin_malloc (n));
+}

gcc/testsuite/gcc.dg/Walloc-size-larger-than-15.c

+/* PR middle-end/82063 - issues with arguments enabled by -Wall
+   { dg-do compile }
+   { dg-options "-O -Walloc-size-larger-than=123456789123456789123456789123456789gb -ftrack-macro-expansion=0" } */
+
+typedef __SIZE_TYPE__ size_t;
+
+void sink (void*);
+
+#define T(x) sink (x)
+
+/* Verify that an exceeingly large -Walloc-size-larger-than argument
+   with a valid suffic is accepted and treated as infinite.  */
+
+void f (void)
+{
+  size_t n = 0;
+  T (__builtin_malloc (n));
+
+  n = __PTRDIFF_MAX__;
+  T (__builtin_malloc (n));
+
+  n += 1;
+  T (__builtin_malloc (n));
+
+  n = __SIZE_MAX__ - 1;
+  T (__builtin_malloc (n));
+
+  n = __SIZE_MAX__;
+  T (__builtin_malloc (n));
+}

gcc/testsuite/gcc.dg/Walloc-size-larger-than-16.c

+/* PR middle-end/82063 - issues with arguments enabled by -Wall
+   { dg-do compile }
+   { dg-options "-O -Walloc-size-larger-than=1zb -ftrack-macro-expansion=0" } */
+
+typedef __SIZE_TYPE__ size_t;
+
+void sink (void*);
+
+#define T(x) sink (x)
+
+/* Verify that an invalid -Walloc-size-larger-than argument is diagnosed
+   and rejected without changing the default setting of PTRDIFF_MAX.  */
+
+void f (void)
+{
+  size_t n = 0;
+  T (__builtin_malloc (n));
+
+  n = __PTRDIFF_MAX__;
+  T (__builtin_malloc (n));
+
+  n += 1;
+  T (__builtin_malloc (n));   /* { dg-warning "exceeds maximum object size" } */
+
+  n = __SIZE_MAX__ - 1;
+  T (__builtin_malloc (n));   /* { dg-warning "exceeds maximum object size" } */
+
+  n = __SIZE_MAX__;
+  T (__builtin_malloc (n));   /* { dg-warning "exceeds maximum object size" } */
+}
+
+/* { dg-warning "invalid argument .1zb. to .-Walloc-size-larger-than=." "" { target *-*-* } 0 } */

gcc/testsuite/gcc.dg/Walloc-size-larger-than-17.c

+/* PR middle-end/82063 - issues with arguments enabled by -Wall
+   { dg-do compile }
+   { dg-options "-O -Wno-alloc-size-larger-than -ftrack-macro-expansion=0" } */
+
+typedef __SIZE_TYPE__ size_t;
+
+void sink (void*);
+
+#define T(x) sink (x)
+
+void f (void)
+{
+  size_t n = 0;
+  T (__builtin_malloc (n));
+
+  n = __PTRDIFF_MAX__;
+  T (__builtin_malloc (n));
+
+  n += 1;
+  T (__builtin_malloc (n));
+
+  n = __SIZE_MAX__ - 1;
+  T (__builtin_malloc (n));
+
+  n = __SIZE_MAX__;
+  T (__builtin_malloc (n));
+}

gcc/testsuite/gcc.dg/Walloc-size-larger-than-2.c

+/* PR middle-end/82063 - issues with arguments enabled by -Wall
+   { dg-do compile }
+   { dg-options "-O -Walloc-size-larger-than=1KiB -ftrack-macro-expansion=0" }
+*/
+
+void sink (void*);
+
+#define T(x) sink (x)
+
+void f (void)
+{
+  unsigned n = 0;
+  T (__builtin_malloc (n));
+
+  n = 1024;   /* 1 kibibyte (KB or KiB) */
+  T (__builtin_malloc (n));
+
+  n = 1025;
+  T (__builtin_malloc (n));   /* { dg-warning "argument 1 value .1025. exceeds maximum object size 1024" } */
+}

gcc/testsuite/gcc.dg/Walloc-size-larger-than-3.c

+/* PR middle-end/82063 - issues with arguments enabled by -Wall
+   { dg-do compile }
+   { dg-options "-O -Walloc-size-larger-than=1kB -ftrack-macro-expansion=0" } */
+
+void sink (void*);
+
+#define T(x) sink (x)
+
+void f (void)
+{
+  unsigned n = 0;
+  T (__builtin_malloc (n));
+
+  n = 1000;   /* 1 kilobyte (kB, not to be confused with KB or KiB) */
+  T (__builtin_malloc (n));
+
+  n = 1001;
+  T (__builtin_malloc (n));   /* { dg-warning "argument 1 value .1001. exceeds maximum object size 1000" } */
+}

gcc/testsuite/gcc.dg/Walloc-size-larger-than-4.c

+/* PR middle-end/82063 - issues with arguments enabled by -Wall
+   { dg-do compile }
+   { dg-options "-O -Walloc-size-larger-than=1MiB -ftrack-macro-expansion=0" } */
+
+void sink (void*);
+
+#define T(x) sink (x)
+
+void f (void)
+{
+  unsigned n = 0;
+  T (__builtin_malloc (n));
+
+  n = 1024 * 1024;   /* 1 mebibyte (MiB) */
+  T (__builtin_malloc (n));
+
+  n += 1;
+  T (__builtin_malloc (n));   /* { dg-warning "argument 1 value .1048577. exceeds maximum object size 1048576" } */
+}

gcc/testsuite/gcc.dg/Walloc-size-larger-than-5.c

+/* PR middle-end/82063 - issues with arguments enabled by -Wall
+   { dg-do compile }
+   { dg-options "-O -Walloc-size-larger-than=1MB -ftrack-macro-expansion=0" } */
+
+void sink (void*);
+
+#define T(x) sink (x)
+
+void f (void)
+{
+  __SIZE_TYPE__ n = 0;
+  T (__builtin_malloc (n));
+
+  n = 1000 * 1000;   /* 1 megabyte (MB) */
+  T (__builtin_malloc (n));
+
+  n += 1;
+  T (__builtin_malloc (n));   /* { dg-warning "argument 1 value .1000001. exceeds maximum object size 1000000" } */
+
+  n = __PTRDIFF_MAX__;
+  T (__builtin_malloc (n));   /* { dg-warning "exceeds maximum object size 1000000" } */
+
+  n = __SIZE_MAX__;
+  T (__builtin_malloc (n));   /* { dg-warning "exceeds maximum object size 1000000" } */
+}

gcc/testsuite/gcc.dg/Walloc-size-larger-than-6.c

+/* PR middle-end/82063 - issues with arguments enabled by -Wall
+   { dg-do compile }
+   { dg-options "-O -Walloc-size-larger-than=1GiB -ftrack-macro-expansion=0" } */
+
+void sink (void*);
+
+#define T(x) sink (x)
+
+void f (void)
+{
+  __SIZE_TYPE__ n = 0;
+  T (__builtin_malloc (n));
+
+  n = 1024 * 1024 * 1024;   /* 1 gigibyte (GiB) */
+  T (__builtin_malloc (n));
+
+  n += 1;
+  T (__builtin_malloc (n));   /* { dg-warning "argument 1 value .1073741825. exceeds maximum object size 1073741824" } */
+
+  n = __PTRDIFF_MAX__;
+  T (__builtin_malloc (n));   /* { dg-warning "exceeds maximum object size" } */
+
+  n = __SIZE_MAX__;
+  T (__builtin_malloc (n));   /* { dg-warning "exceeds maximum object size" } */
+}

gcc/testsuite/gcc.dg/Walloc-size-larger-than-7.c

+/* PR middle-end/82063 - issues with arguments enabled by -Wall
+   { dg-do compile }
+   { dg-options "-O -Walloc-size-larger-than=1GB -ftrack-macro-expansion=0" } */
+
+void sink (void*);
+
+#define T(x) sink (x)
+
+void f (void)
+{
+  __SIZE_TYPE__ n = 0;
+  T (__builtin_malloc (n));
+
+  n = 1000 * 1000 * 1000;   /* 1 gigabyte (GB) */
+  T (__builtin_malloc (n));
+
+  n += 1;
+  T (__builtin_malloc (n));   /* { dg-warning "argument 1 value .1000000001. exceeds maximum object size 1000000000" } */
+
+  n = __PTRDIFF_MAX__;
+  T (__builtin_malloc (n));   /* { dg-warning "exceeds maximum object size" } */
+
+  n = __SIZE_MAX__;
+  T (__builtin_malloc (n));   /* { dg-warning "exceeds maximum object size" } */
+}

gcc/testsuite/gcc.dg/Walloc-size-larger-than-8.c

+/* PR middle-end/82063 - issues with arguments enabled by -Wall
+   { dg-do compile { target lp64 } }
+   { dg-options "-O -Walloc-size-larger-than=1TiB -ftrack-macro-expansion=0" } */
+
+typedef __SIZE_TYPE__ size_t;
+
+void sink (void*);
+
+#define T(x) sink (x)
+
+void f (void)
+{
+  size_t n = 0;
+  T (__builtin_malloc (n));
+
+  n = (size_t)1024 * 1024 * 1024 * 1024;   /* 1 tebibyte (TiB) */
+  T (__builtin_malloc (n));
+
+  n += 1;
+  T (__builtin_malloc (n));   /* { dg-warning "argument 1 value .1099511627777. exceeds maximum object size 1099511627776" } */
+
+  n = __PTRDIFF_MAX__;
+  T (__builtin_malloc (n));   /* { dg-warning "exceeds maximum object size" } */
+
+  n = __SIZE_MAX__;
+  T (__builtin_malloc (n));   /* { dg-warning "exceeds maximum object size" } */
+}

gcc/testsuite/gcc.dg/Walloc-size-larger-than-9.c

+/* PR middle-end/82063 - issues with arguments enabled by -Wall
+   { dg-do compile { target lp64 } }
+   { dg-options "-O -Walloc-size-larger-than=1TB -ftrack-macro-expansion=0" } */
+
+typedef __SIZE_TYPE__ size_t;
+
+void sink (void*);
+
+#define T(x) sink (x)
+
+void f (void)
+{
+  size_t n = 0;
+  T (__builtin_malloc (n));
+
+  n = (size_t)1000 * 1000 * 1000 * 1000;   /* 1 terabyte (TB) */
+  T (__builtin_malloc (n));
+
+  n += 1;
+  T (__builtin_malloc (n));   /* { dg-warning "argument 1 value .1000000000001. exceeds maximum object size 1000000000000" } */
+
+  n = __PTRDIFF_MAX__;
+  T (__builtin_malloc (n));   /* { dg-warning "exceeds maximum object size" } */
+
+  n = __SIZE_MAX__;
+  T (__builtin_malloc (n));   /* { dg-warning "exceeds maximum object size" } */
+}

gcc/testsuite/gcc.dg/Walloc-size-larger-than.c

+/* PR middle-end/82063 - issues with arguments enabled by -Wall
+   { dg-do compile }
+   { dg-options "-Walloc-size-larger-than=0 -ftrack-macro-expansion=0" } */
+
+void sink (void*);
+
+#define T(x) sink (x)
+
+void f (void)
+{
+  T (__builtin_malloc (0));
+  T (__builtin_malloc (1));   /* { dg-warning "argument 1 value .1. exceeds maximum object size 0" } */
+}