extend.texi (alloc_size): New attribute.
2007-05-25 Dirk Mueller <dmueller@suse.de> Marcus Meissner <meissner@suse.de> * doc/extend.texi (alloc_size): New attribute. * c-common.c (handle_alloc_size_attribute): New. * tree-object-size.c (alloc_object_size): Use alloc_size attribute, if available. * testsuite/gcc.dg/attr-alloc_size.c: New. Co-Authored-By: Marcus Meissner <meissner@suse.de> From-SVN: r125073
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@ -1,3 +1,11 @@
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2007-05-25 Dirk Mueller <dmueller@suse.de>
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Marcus Meissner <meissner@suse.de>
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* doc/extend.texi (alloc_size): New attribute.
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* c-common.c (handle_alloc_size_attribute): New.
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* tree-object-size.c (alloc_object_size): Use alloc_size
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attribute, if available.
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2007-05-25 H.J. Lu <hongjiu.lu@intel.com>
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* config/i386/i386.c (__builtin_ia32_vec_ext_v2df): Mark it
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@ -556,6 +556,7 @@ static tree handle_cleanup_attribute (tree *, tree, tree, int, bool *);
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static tree handle_warn_unused_result_attribute (tree *, tree, tree, int,
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bool *);
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static tree handle_sentinel_attribute (tree *, tree, tree, int, bool *);
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static tree handle_alloc_size_attribute (tree *, tree, tree, int, bool *);
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static void check_function_nonnull (tree, int, tree *);
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static void check_nonnull_arg (void *, tree, unsigned HOST_WIDE_INT);
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@ -650,6 +651,8 @@ const struct attribute_spec c_common_attribute_table[] =
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handle_warn_unused_result_attribute },
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{ "sentinel", 0, 1, false, true, true,
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handle_sentinel_attribute },
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{ "alloc_size", 1, 2, false, true, true,
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handle_alloc_size_attribute },
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{ "cold", 0, 0, true, false, false,
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handle_cold_attribute },
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{ "hot", 0, 0, true, false, false,
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@ -5579,6 +5582,37 @@ handle_malloc_attribute (tree *node, tree name, tree ARG_UNUSED (args),
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return NULL_TREE;
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}
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/* Handle a "alloc_size" attribute; arguments as in
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struct attribute_spec.handler. */
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static tree
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handle_alloc_size_attribute (tree *node, tree ARG_UNUSED (name), tree args,
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int ARG_UNUSED (flags), bool *no_add_attrs)
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{
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tree params = TYPE_ARG_TYPES (*node);
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unsigned arg_count = 0;
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for (; TREE_CHAIN (params); params = TREE_CHAIN (params))
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arg_count ++;
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for (; args; args = TREE_CHAIN (args))
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{
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tree position = TREE_VALUE (args);
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if (TREE_CODE (position) != INTEGER_CST
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|| TREE_INT_CST_HIGH (position)
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|| TREE_INT_CST_LOW (position) < 1
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|| TREE_INT_CST_LOW (position) > arg_count )
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{
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warning (OPT_Wattributes,
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"alloc_size parameter outside range");
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*no_add_attrs = true;
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return NULL_TREE;
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}
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}
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return NULL_TREE;
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}
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/* Handle a "returns_twice" attribute; arguments as in
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struct attribute_spec.handler. */
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@ -1572,13 +1572,14 @@ The keyword @code{__attribute__} allows you to specify special
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attributes when making a declaration. This keyword is followed by an
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attribute specification inside double parentheses. The following
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attributes are currently defined for functions on all targets:
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@code{noreturn}, @code{returns_twice}, @code{noinline}, @code{always_inline},
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@code{flatten}, @code{pure}, @code{const}, @code{nothrow}, @code{sentinel},
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@code{format}, @code{format_arg}, @code{no_instrument_function},
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@code{section}, @code{constructor}, @code{destructor}, @code{used},
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@code{unused}, @code{deprecated}, @code{weak}, @code{malloc},
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@code{alias}, @code{warn_unused_result}, @code{nonnull},
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@code{gnu_inline} and @code{externally_visible}, @code{hot}, @code{cold}.
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@code{alloc_size}, @code{noreturn}, @code{returns_twice}, @code{noinline},
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@code{always_inline}, @code{flatten}, @code{pure}, @code{const},
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@code{nothrow}, @code{sentinel}, @code{format}, @code{format_arg},
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@code{no_instrument_function}, @code{section}, @code{constructor},
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@code{destructor}, @code{used}, @code{unused}, @code{deprecated},
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@code{weak}, @code{malloc}, @code{alias}, @code{warn_unused_result},
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@code{nonnull}, @code{gnu_inline} and @code{externally_visible},
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@code{hot}, @code{cold}.
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Several other attributes are defined for functions on particular target
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systems. Other attributes, including @code{section} are supported for
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variables declarations (@pxref{Variable Attributes}) and for types (@pxref{Type
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@ -1611,6 +1612,30 @@ is not defined in the same translation unit.
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Not all target machines support this attribute.
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@item alloc_size
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@cindex @code{alloc_size} attribute
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The @code{alloc_size} attribute is used to tell the compiler that the
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function return value points to memory, where the size is given by
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one or two of the functions parameters. GCC uses this
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information to improve the correctness of @code{__builtin_object_size}.
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The function parameter(s) denoting the allocated size are specified by
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one or two integer arguments supplied to the attribute. The allocated size
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is either the value of the single function argument specified or the product
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of the two function arguments specified. Argument numbering starts at
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one.
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For instance,
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@smallexample
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void* my_calloc(size_t, size_t) __attribute__((alloc_size(1,2)))
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void my_realloc(void* size_t) __attribute__((alloc_size(2)))
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@end smallexample
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declares that my_calloc will return memory of the size given by
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the product of parameter 1 and 2 and that my_realloc will return memory
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of the size given by parameter 2.
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@item always_inline
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@cindex @code{always_inline} function attribute
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Generally, functions are not inlined unless optimization is specified.
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@ -1,3 +1,8 @@
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2007-05-25 Dirk Mueller <dmueller@suse.de>
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Marcus Meissner <meissner@suse.de>
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* testsuite/gcc.dg/attr-alloc_size.c: New.
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2007-05-25 Simon Martin <simartin@users.sourceforge.net>
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Lee Millward <lee.millward@gmail.com>
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@ -0,0 +1,36 @@
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/* { dg-do compile } */
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/* { dg-options "-O2 -Wall" } */
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extern void abort (void);
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#include "../gcc.c-torture/execute/builtins/chk.h"
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extern char *mallocminus1(int size) __attribute__((alloc_size(-1))); /* { dg-warning "parameter outside range" } */
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extern char *malloc0(int size) __attribute__((alloc_size(0))); /* { dg-warning "parameter outside range" } */
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extern char *malloc1(int size) __attribute__((alloc_size(1)));
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extern char *malloc2(int empty, int size) __attribute__((alloc_size(2)));
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extern char *calloc1(int size, int elements) __attribute__((alloc_size(1,2)));
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extern char *calloc2(int size, int empty, int elements) __attribute__((alloc_size(1,3)));
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extern char *balloc1(void *size) __attribute__((alloc_size(1)));
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void
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test (void)
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{
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char *p;
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p = malloc0 (6);
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strcpy (p, "Hello");
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p = malloc1 (6);
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strcpy (p, "Hello");
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strcpy (p, "Hello World"); /* { dg-warning "will always overflow" "strcpy" } */
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p = malloc2 (424242, 6);
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strcpy (p, "World");
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strcpy (p, "Hello World"); /* { dg-warning "will always overflow" "strcpy" } */
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p = calloc1 (2, 5);
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strcpy (p, "World");
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strcpy (p, "Hello World"); /* { dg-warning "will always overflow" "strcpy" } */
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p = calloc2 (2, 424242, 5);
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strcpy (p, "World");
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strcpy (p, "Hello World"); /* { dg-warning "will always overflow" "strcpy" } */
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}
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@ -24,6 +24,7 @@ Boston, MA 02110-1301, USA. */
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#include "coretypes.h"
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#include "tm.h"
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#include "tree.h"
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#include "toplev.h"
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#include "diagnostic.h"
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#include "tree-flow.h"
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#include "tree-pass.h"
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@ -229,39 +230,52 @@ static unsigned HOST_WIDE_INT
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alloc_object_size (tree call, int object_size_type)
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{
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tree callee, bytes = NULL_TREE;
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tree alloc_size;
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int arg1 = -1, arg2 = -1;
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gcc_assert (TREE_CODE (call) == CALL_EXPR);
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callee = get_callee_fndecl (call);
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if (callee
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&& DECL_BUILT_IN_CLASS (callee) == BUILT_IN_NORMAL)
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if (!callee)
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return unknown[object_size_type];
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alloc_size = lookup_attribute ("alloc_size", TYPE_ATTRIBUTES (TREE_TYPE(callee)));
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if (alloc_size && TREE_VALUE (alloc_size))
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{
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tree p = TREE_VALUE (alloc_size);
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arg1 = TREE_INT_CST_LOW (TREE_VALUE (p))-1;
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if (TREE_CHAIN (p))
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arg2 = TREE_INT_CST_LOW (TREE_VALUE (TREE_CHAIN (p)))-1;
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}
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if (DECL_BUILT_IN_CLASS (callee) == BUILT_IN_NORMAL)
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switch (DECL_FUNCTION_CODE (callee))
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{
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case BUILT_IN_CALLOC:
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arg2 = 1;
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/* fall through */
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case BUILT_IN_MALLOC:
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case BUILT_IN_ALLOCA:
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if (call_expr_nargs (call) == 1
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&& TREE_CODE (CALL_EXPR_ARG (call, 0)) == INTEGER_CST)
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bytes = fold_convert (sizetype, CALL_EXPR_ARG (call, 0));
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break;
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/*
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case BUILT_IN_REALLOC:
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if (call_expr_nargs (call) == 2
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&& TREE_CODE (CALL_EXPR_ARG (call, 1)) == INTEGER_CST)
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bytes = fold_convert (sizetype, CALL_EXPR_ARG (call, 1));
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break;
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*/
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case BUILT_IN_CALLOC:
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if (call_expr_nargs (call) == 2
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&& TREE_CODE (CALL_EXPR_ARG (call, 0)) == INTEGER_CST
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&& TREE_CODE (CALL_EXPR_ARG (call, 1)) == INTEGER_CST)
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bytes = size_binop (MULT_EXPR,
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fold_convert (sizetype, CALL_EXPR_ARG (call, 0)),
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fold_convert (sizetype, CALL_EXPR_ARG (call, 1)));
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break;
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arg1 = 0;
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default:
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break;
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}
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if (arg1 < 0 || arg1 >= call_expr_nargs (call)
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|| TREE_CODE (CALL_EXPR_ARG (call, arg1)) != INTEGER_CST
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|| (arg2 >= 0
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&& (arg2 >= call_expr_nargs (call)
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|| TREE_CODE (CALL_EXPR_ARG (call, arg2)) != INTEGER_CST)))
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return unknown[object_size_type];
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if (arg2 >= 0)
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bytes = size_binop (MULT_EXPR,
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fold_convert (sizetype, CALL_EXPR_ARG (call, arg1)),
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fold_convert (sizetype, CALL_EXPR_ARG (call, arg2)));
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else if (arg1 >= 0)
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bytes = fold_convert (sizetype, CALL_EXPR_ARG (call, arg1));
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if (bytes && host_integerp (bytes, 1))
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return tree_low_cst (bytes, 1);
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