[PATCH 08/10] tree-object-size: Handle GIMPLE_CALL

Siddhesh Poyarekar siddhesh@gotplt.org
Tue Nov 9 19:01:34 GMT 2021


Handle non-constant expressions in GIMPLE_CALL arguments.  Also handle
alloca.

gcc/ChangeLog:

	* tree-object-size.c (alloc_object_size): Make and return
	non-constant size expression.
	(call_object_size): Return expression or unknown based on
	whether dynamic object size is requested.

gcc/testsuite/ChangeLog:

	* gcc.dg/builtin-dynamic-object-size-0.c: Add new tests.
	* gcc.dg/builtin-object-size-1.c (test1) [DYNAMIC_OBJECT_SIZE]:
	Alter expected result for dynamic object size.
	* gcc.dg/builtin-object-size-2.c (test1) [DYNAMIC_OBJECT_SIZE]:
	Likewise.
	* gcc.dg/builtin-object-size-3.c (test1) [DYNAMIC_OBJECT_SIZE]:
	Likewise.
	* gcc.dg/builtin-object-size-4.c (test1) [DYNAMIC_OBJECT_SIZE]:
	Likewise.

Signed-off-by: Siddhesh Poyarekar <siddhesh@gotplt.org>
---
 .../gcc.dg/builtin-dynamic-object-size-0.c    | 227 +++++++++++++++++-
 gcc/testsuite/gcc.dg/builtin-object-size-1.c  |   7 +
 gcc/testsuite/gcc.dg/builtin-object-size-2.c  |  14 ++
 gcc/testsuite/gcc.dg/builtin-object-size-3.c  |   7 +
 gcc/testsuite/gcc.dg/builtin-object-size-4.c  |  14 ++
 gcc/tree-object-size.c                        |  26 +-
 6 files changed, 285 insertions(+), 10 deletions(-)

diff --git a/gcc/testsuite/gcc.dg/builtin-dynamic-object-size-0.c b/gcc/testsuite/gcc.dg/builtin-dynamic-object-size-0.c
index 80896d54693..4ad49a51878 100644
--- a/gcc/testsuite/gcc.dg/builtin-dynamic-object-size-0.c
+++ b/gcc/testsuite/gcc.dg/builtin-dynamic-object-size-0.c
@@ -4,12 +4,71 @@
 typedef __SIZE_TYPE__ size_t;
 #define abort __builtin_abort
 
+void *
+__attribute__ ((alloc_size (1)))
+__attribute__ ((__nothrow__ , __leaf__))
+__attribute__ ((noinline))
+alloc_func (size_t sz)
+{
+  return __builtin_malloc (sz);
+}
+
+void *
+__attribute__ ((alloc_size (1, 2)))
+__attribute__ ((__nothrow__ , __leaf__))
+__attribute__ ((noinline))
+calloc_func (size_t cnt, size_t sz)
+{
+  return __builtin_calloc (cnt, sz);
+}
+
+void *
+__attribute__ ((noinline))
+unknown_allocator (size_t cnt, size_t sz)
+{
+  return __builtin_calloc (cnt, sz);
+}
+
+size_t
+__attribute__ ((noinline))
+test_unknown (size_t cnt, size_t sz)
+{
+  void *ret = unknown_allocator (cnt, sz);
+  return __builtin_dynamic_object_size (ret, 0);
+}
+
+/* Malloc-like allocator.  */
+
+size_t
+__attribute__ ((noinline))
+test_malloc (size_t sz)
+{
+  void *ret = alloc_func (sz);
+  return __builtin_dynamic_object_size (ret, 0);
+}
+
+size_t
+__attribute__ ((noinline))
+test_builtin_malloc (size_t sz)
+{
+  void *ret = __builtin_malloc (sz);
+  return __builtin_dynamic_object_size (ret, 0);
+}
+
+size_t
+__attribute__ ((noinline))
+test_builtin_malloc_cond (int cond)
+{
+  void *ret = __builtin_malloc (cond ? 32 : 64);
+  return __builtin_dynamic_object_size (ret, 0);
+}
+
 size_t
 __attribute__ ((noinline))
 test_builtin_malloc_condphi (int cond)
 {
   void *ret;
- 
+
   if (cond)
     ret = __builtin_malloc (32);
   else
@@ -18,6 +77,79 @@ test_builtin_malloc_condphi (int cond)
   return __builtin_dynamic_object_size (ret, 0);
 }
 
+size_t
+__attribute__ ((noinline))
+test_builtin_malloc_condphi2 (int cond, size_t in)
+{
+  void *ret;
+
+  if (cond)
+    ret = __builtin_malloc (in);
+  else
+    ret = __builtin_malloc (64);
+
+  return __builtin_dynamic_object_size (ret, 0);
+}
+
+size_t
+__attribute__ ((noinline))
+test_builtin_malloc_condphi3 (int cond, size_t in, size_t in2)
+{
+  void *ret;
+
+  if (cond)
+    ret = __builtin_malloc (in);
+  else
+    ret = __builtin_malloc (in2);
+
+  return __builtin_dynamic_object_size (ret, 0);
+}
+
+size_t
+__attribute__ ((noinline))
+test_builtin_malloc_condphi4 (size_t sz, int cond)
+{
+  char *a = __builtin_malloc (sz);
+  char b[sz / 2];
+
+  return __builtin_dynamic_object_size (cond ? b : (void *) &a, 0);
+}
+
+size_t
+__attribute__ ((noinline))
+test_builtin_malloc_condphi5 (size_t sz, int cond, char *c)
+{
+  char *a = __builtin_malloc (sz);
+
+  return __builtin_dynamic_object_size (cond ? c : (void *) &a, 0);
+}
+
+/* Calloc-like allocator.  */
+
+size_t
+__attribute__ ((noinline))
+test_calloc (size_t cnt, size_t sz)
+{
+  void *ret = calloc_func (cnt, sz);
+  return __builtin_dynamic_object_size (ret, 0);
+}
+
+size_t
+__attribute__ ((noinline))
+test_builtin_calloc (size_t cnt, size_t sz)
+{
+  void *ret = __builtin_calloc (cnt, sz);
+  return __builtin_dynamic_object_size (ret, 0);
+}
+
+size_t
+__attribute__ ((noinline))
+test_builtin_calloc_cond (int cond1, int cond2)
+{
+  void *ret = __builtin_calloc (cond1 ? 32 : 64, cond2 ? 1024 : 16);
+  return __builtin_dynamic_object_size (ret, 0);
+}
+
 size_t
 __attribute__ ((noinline))
 test_builtin_calloc_condphi (size_t cnt, size_t sz, int cond)
@@ -33,6 +165,47 @@ test_builtin_calloc_condphi (size_t cnt, size_t sz, int cond)
   return __builtin_dynamic_object_size (cond ? ch : (void *) &bin, 0);
 }
 
+/* Passthrough functions.  */
+
+size_t
+__attribute__ ((noinline))
+test_passthrough (size_t sz, char *in)
+{
+  char *bin = __builtin_malloc (sz);
+  char *dest = __builtin_memcpy (bin, in, sz);
+
+  return __builtin_dynamic_object_size (dest, 0);
+}
+
+size_t
+__attribute__ ((noinline))
+test_passthrough_nonssa (char *in)
+{
+  char bin[__builtin_strlen (in) + 1];
+  char *dest = __builtin_memcpy (bin, in, __builtin_strlen (in) + 1);
+
+  return __builtin_dynamic_object_size (dest, 0);
+}
+
+/* Variable length arrays.  */
+size_t
+__attribute__ ((noinline))
+test_dynarray (size_t sz)
+{
+  char bin[sz];
+
+  return __builtin_dynamic_object_size (bin, 0);
+}
+
+size_t
+__attribute__ ((noinline))
+test_dynarray_cond (int cond)
+{
+  char bin[cond ? 8 : 16];
+
+  return __builtin_dynamic_object_size (bin, 0);
+}
+
 size_t
 __attribute__ ((noinline))
 test_deploop (size_t sz, size_t cond)
@@ -41,7 +214,7 @@ test_deploop (size_t sz, size_t cond)
 
   for (size_t i = 0; i < sz; i++)
     if (i == cond)
-      bin = __builtin_alloca (64);
+      bin = __builtin_alloca (sz);
 
   return __builtin_dynamic_object_size (bin, 0);
 }
@@ -63,12 +236,62 @@ unsigned nfails = 0;
 int
 main (int argc, char **argv)
 {
+  size_t outsz = test_unknown (32, 42);
+  if (outsz != -1 && outsz != 32)
+    FAIL ();
+  if (test_malloc (2048) != 2048)
+    FAIL ();
+  if (test_builtin_malloc (2048) != 2048)
+    FAIL ();
+  if (test_builtin_malloc_cond (1) != 32)
+    FAIL ();
+  if (test_builtin_malloc_cond (0) != 64)
+    FAIL ();
   if (test_builtin_malloc_condphi (1) != 32)
     FAIL ();
   if (test_builtin_malloc_condphi (0) != 64)
     FAIL ();
+  if (test_builtin_malloc_condphi2 (1, 128) != 128)
+    FAIL ();
+  if (test_builtin_malloc_condphi2 (0, 128) != 64)
+    FAIL ();
+  if (test_builtin_malloc_condphi3 (1, 128, 256) != 128)
+    FAIL ();
+  if (test_builtin_malloc_condphi3 (0, 128, 256) != 256)
+    FAIL ();
+  if (test_builtin_malloc_condphi4 (128, 1) != 64)
+    FAIL ();
+  if (test_builtin_malloc_condphi4 (128, 0) != sizeof (void *))
+    FAIL ();
+  if (test_builtin_malloc_condphi5 (128, 0, argv[0]) != -1)
+    FAIL ();
+  if (test_calloc (2048, 4) != 2048 * 4)
+    FAIL ();
+  if (test_builtin_calloc (2048, 8) != 2048 * 8)
+    FAIL ();
+  if (test_builtin_calloc_cond (0, 0) != 64 * 16)
+    FAIL ();
+  if (test_builtin_calloc_cond (1, 1) != 32 * 1024)
+    FAIL ();
+  if (test_builtin_calloc_condphi (128, 1, 1) != 128)
+    FAIL ();
   if (test_builtin_calloc_condphi (128, 1, 0) == 128)
     FAIL ();
+  if (test_builtin_calloc_condphi (128, 1, 0) == -1)
+    FAIL ();
+  if (test_passthrough (__builtin_strlen (argv[0]) + 1, argv[0])
+      != __builtin_strlen (argv[0]) + 1)
+    FAIL ();
+  if (test_passthrough_nonssa (argv[0]) != __builtin_strlen (argv[0]) + 1)
+    FAIL ();
+  if (test_dynarray (__builtin_strlen (argv[0])) != __builtin_strlen (argv[0]))
+    FAIL ();
+  if (test_dynarray_cond (0) != 16)
+    FAIL ();
+  if (test_dynarray_cond (1) != 8)
+    FAIL ();
+  if (test_deploop (128, 4) != 128)
+    FAIL ();
   if (test_deploop (128, 129) != 32)
     FAIL ();
   if (test_parmsz_simple (argv[0], __builtin_strlen (argv[0]) + 1)
diff --git a/gcc/testsuite/gcc.dg/builtin-object-size-1.c b/gcc/testsuite/gcc.dg/builtin-object-size-1.c
index 76df4c96271..606141f9405 100644
--- a/gcc/testsuite/gcc.dg/builtin-object-size-1.c
+++ b/gcc/testsuite/gcc.dg/builtin-object-size-1.c
@@ -135,10 +135,17 @@ test1 (void *q, int x)
     abort ();
   if (__builtin_object_size (&extb[5], 0) != sizeof (extb) - 5)
     abort ();
+#ifdef DYNAMIC_OBJECT_SIZE
+  if (__builtin_object_size (var, 0) != x + 10)
+    abort ();
+  if (__builtin_object_size (var + 10, 0) != x)
+    abort ();
+#else
   if (__builtin_object_size (var, 0) != (size_t) -1)
     abort ();
   if (__builtin_object_size (var + 10, 0) != (size_t) -1)
     abort ();
+#endif
   if (__builtin_object_size (&var[5], 0) != (size_t) -1)
     abort ();
   if (__builtin_object_size (zerol, 0) != 0)
diff --git a/gcc/testsuite/gcc.dg/builtin-object-size-2.c b/gcc/testsuite/gcc.dg/builtin-object-size-2.c
index c395d2e95b3..57fd17d5a45 100644
--- a/gcc/testsuite/gcc.dg/builtin-object-size-2.c
+++ b/gcc/testsuite/gcc.dg/builtin-object-size-2.c
@@ -137,16 +137,30 @@ test1 (void *q, int x)
     abort ();
   if (__builtin_object_size (&extc[5].c[3], 1) != (size_t) -1)
     abort ();
+#ifdef DYNAMIC_OBJECT_SIZE
+  if (__builtin_object_size (var, 1) != x + 10)
+    abort ();
+  if (__builtin_object_size (var + 10, 1) != x)
+    abort ();
+#else
   if (__builtin_object_size (var, 1) != (size_t) -1)
     abort ();
   if (__builtin_object_size (var + 10, 1) != (size_t) -1)
     abort ();
+#endif
   if (__builtin_object_size (&var[5], 1) != (size_t) -1)
     abort ();
+#ifdef DYNAMIC_OBJECT_SIZE
+  if (__builtin_object_size (vara, 1) != (x + 10) * sizeof (struct A))
+    abort ();
+  if (__builtin_object_size (vara + 10, 1) != x * sizeof (struct A))
+    abort ();    
+#else
   if (__builtin_object_size (vara, 1) != (size_t) -1)
     abort ();
   if (__builtin_object_size (vara + 10, 1) != (size_t) -1)
     abort ();    
+#endif
   if (__builtin_object_size (&vara[5], 1) != (size_t) -1)
     abort ();
   if (__builtin_object_size (&vara[0].a, 1) != sizeof (vara[0].a))
diff --git a/gcc/testsuite/gcc.dg/builtin-object-size-3.c b/gcc/testsuite/gcc.dg/builtin-object-size-3.c
index ccdc6ef8cc8..5b323ca3527 100644
--- a/gcc/testsuite/gcc.dg/builtin-object-size-3.c
+++ b/gcc/testsuite/gcc.dg/builtin-object-size-3.c
@@ -140,10 +140,17 @@ test1 (void *q, int x)
     abort ();
   if (__builtin_object_size (&extb[5], 2) != sizeof (extb) - 5)
     abort ();
+#ifdef DYNAMIC_OBJECT_SIZE
+  if (__builtin_object_size (var, 2) != x + 10)
+    abort ();
+  if (__builtin_object_size (var + 10, 2) != x)
+    abort ();
+#else
   if (__builtin_object_size (var, 2) != 0)
     abort ();
   if (__builtin_object_size (var + 10, 2) != 0)
     abort ();
+#endif
   if (__builtin_object_size (&var[5], 2) != 0)
     abort ();
   if (__builtin_object_size (zerol, 2) != 0)
diff --git a/gcc/testsuite/gcc.dg/builtin-object-size-4.c b/gcc/testsuite/gcc.dg/builtin-object-size-4.c
index 002512d38ab..2d222301eff 100644
--- a/gcc/testsuite/gcc.dg/builtin-object-size-4.c
+++ b/gcc/testsuite/gcc.dg/builtin-object-size-4.c
@@ -150,16 +150,30 @@ test1 (void *q, int x)
     abort ();
   if (__builtin_object_size (&extc[5].c[3], 3) != 0)
     abort ();
+#ifdef DYNAMIC_OBJECT_SIZE
+  if (__builtin_object_size (var, 3) != x + 10)
+    abort ();
+  if (__builtin_object_size (var + 10, 3) != x)
+    abort ();
+#else
   if (__builtin_object_size (var, 3) != 0)
     abort ();
   if (__builtin_object_size (var + 10, 3) != 0)
     abort ();
+#endif
   if (__builtin_object_size (&var[5], 3) != 0)
     abort ();
+#ifdef DYNAMIC_OBJECT_SIZE
+  if (__builtin_object_size (vara, 3) != (x + 10) * sizeof (struct A))
+    abort ();
+  if (__builtin_object_size (vara + 10, 3) != x * sizeof (struct A))
+    abort ();    
+#else
   if (__builtin_object_size (vara, 3) != 0)
     abort ();
   if (__builtin_object_size (vara + 10, 3) != 0)
     abort ();    
+#endif
   if (__builtin_object_size (&vara[5], 3) != 0)
     abort ();
   if (__builtin_object_size (&vara[0].a, 3) != sizeof (vara[0].a))
diff --git a/gcc/tree-object-size.c b/gcc/tree-object-size.c
index 5a80432d40c..d5b0c8226f0 100644
--- a/gcc/tree-object-size.c
+++ b/gcc/tree-object-size.c
@@ -584,7 +584,8 @@ alloc_object_size (const gcall *call, int object_size_type)
   gcc_assert (is_gimple_call (call));
 
   tree calltype;
-  if (tree callfn = gimple_call_fndecl (call))
+  tree callfn = gimple_call_fndecl (call);
+  if (callfn)
     calltype = TREE_TYPE (callfn);
   else
     calltype = gimple_call_fntype (call);
@@ -604,12 +605,13 @@ alloc_object_size (const gcall *call, int object_size_type)
       if (TREE_CHAIN (p))
         arg2 = TREE_INT_CST_LOW (TREE_VALUE (TREE_CHAIN (p)))-1;
     }
+  else if (gimple_call_builtin_p (call, BUILT_IN_NORMAL)
+	   && callfn && ALLOCA_FUNCTION_CODE_P (DECL_FUNCTION_CODE (callfn)))
+  arg1 = 0;
 
-  if (arg1 < 0 || arg1 >= (int)gimple_call_num_args (call)
-      || TREE_CODE (gimple_call_arg (call, arg1)) != INTEGER_CST
-      || (arg2 >= 0
-	  && (arg2 >= (int)gimple_call_num_args (call)
-	      || TREE_CODE (gimple_call_arg (call, arg2)) != INTEGER_CST)))
+  /* Non-const arguments are OK here, let the caller handle constness.  */
+  if (arg1 < 0 || arg1 >= (int) gimple_call_num_args (call)
+      || arg2 >= (int) gimple_call_num_args (call))
     return size_unknown (object_size_type);
 
   tree bytes = NULL_TREE;
@@ -620,7 +622,10 @@ alloc_object_size (const gcall *call, int object_size_type)
   else if (arg1 >= 0)
     bytes = fold_convert (sizetype, gimple_call_arg (call, arg1));
 
-  return bytes;
+  if (bytes)
+    return STRIP_NOPS (bytes);
+
+  return size_unknown (object_size_type);
 }
 
 
@@ -1156,7 +1161,12 @@ call_object_size (struct object_size_info *osi, gcall *call)
 
   gcc_assert (is_gimple_call (call));
 
-  return alloc_object_size (call, object_size_type);
+  tree bytes = alloc_object_size (call, object_size_type);
+
+  if ((object_size_type & OST_DYNAMIC) || TREE_CODE (bytes) == INTEGER_CST)
+    return bytes;
+
+  return  size_unknown (object_size_type);
 }
 
 
-- 
2.31.1



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