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Add _COGL_STATIC_ASSERT macro
This adds a _COGL_STATIC_ASSERT macro that can be used for compile time assertions in C code. If supported by the compiler this macro uses _Static_assert so that a message can be printed out if the assertion fails. Reviewed-by: Neil Roberts <neil@linux.intel.com> (cherry picked from commit 465b39a764f2720e77678cafa56acb0e69007ffd)
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@ -37,7 +37,10 @@
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/* This code assumes that we can cast an unsigned long to a pointer
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and back without losing any data */
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G_STATIC_ASSERT (sizeof (unsigned long) <= sizeof (void *));
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_COGL_STATIC_ASSERT (sizeof (unsigned long) <= sizeof (void *),
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"This toolchain breaks Cogl's assumption that it can "
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"safely cast an unsigned long to a pointer without "
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"loosing data");
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#define ARRAY_INDEX(bit_num) \
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((bit_num) / (sizeof (unsigned long) * 8))
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@ -2590,8 +2590,13 @@ _cogl_pipeline_init_layer_state_hash_functions (void)
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layer_state_hash_functions[_index] =
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_cogl_pipeline_layer_hash_fragment_snippets_state;
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{
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/* So we get a big error if we forget to update this code! */
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g_assert (COGL_PIPELINE_LAYER_STATE_SPARSE_COUNT == 10);
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_COGL_STATIC_ASSERT (COGL_PIPELINE_LAYER_STATE_SPARSE_COUNT == 10,
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"Don't forget to install a hash function for new "
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"pipeline state and update assert at end of "
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"_cogl_pipeline_init_state_hash_functions");
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}
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}
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static gboolean
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@ -2697,8 +2702,13 @@ _cogl_pipeline_init_state_hash_functions (void)
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state_hash_functions[COGL_PIPELINE_STATE_FRAGMENT_SNIPPETS_INDEX] =
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_cogl_pipeline_hash_fragment_snippets_state;
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{
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/* So we get a big error if we forget to update this code! */
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g_assert (COGL_PIPELINE_STATE_SPARSE_COUNT == 16);
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_COGL_STATIC_ASSERT (COGL_PIPELINE_STATE_SPARSE_COUNT == 16,
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"Make sure to install a hash function for "
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"newly added pipeline state and update assert "
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"in _cogl_pipeline_init_state_hash_functions");
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}
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}
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unsigned int
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@ -34,6 +34,11 @@
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#include <stdio.h>
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#endif
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/* Double check that config.h has been included */
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#if !defined (GETTEXT_PACKAGE) && !defined (_COGL_IN_TEST_BITMASK)
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#error "config.h must be included before including cogl-util.h"
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#endif
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/* When compiling with Visual Studio, symbols that represent data that
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are exported out of the DLL need to be marked with the dllexport
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attribute. */
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@ -227,4 +232,50 @@ _cogl_util_pixel_format_from_masks (unsigned long r_mask,
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int depth, int bpp,
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int byte_order);
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/* Since we can't rely on _Static_assert always being available for
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* all compilers we have limited static assert that can be used in
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* C code but not in headers.
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*/
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#define _COGL_TYPEDEF_ASSERT(EXPRESSION) \
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typedef struct { char Compile_Time_Assertion[(EXPRESSION) ? 1 : -1]; } \
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G_PASTE (_GStaticAssert_, __LINE__)
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/* _COGL_STATIC_ASSERT:
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* @expression: An expression to assert evaluates to true at compile
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* time.
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* @message: A message to print to the console if the assertion fails
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* at compile time.
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*
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* Allows you to assert that an expression evaluates to true at
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* compile time and aborts compilation if not. If possible message
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* will also be printed if the assertion fails.
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*
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* Note: Only Gcc >= 4.6 supports the c11 _Static_assert which lets us
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* print a nice message if the compile time assertion fails.
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*
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* Note: this assertion macro can only be used in C code where it is
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* valid to use a typedef. This macro should not be used in headers
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* because we can't guarantee a unique name for the typedef due to
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* the name being based on the line number of the file it's used in.
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*
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* Although we can remove this limitation if the compiler supports
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* _Static_assert we currently choose to maintain the limitation in
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* any case to help ensure we don't accidentally create code that
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* doesn't compile on some toolchains because we forgot about this
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* limitation.
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*/
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#ifdef HAVE_STATIC_ASSERT
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#define _COGL_STATIC_ASSERT(EXPRESSION, MESSAGE) \
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_Static_assert (EXPRESSION, MESSAGE); \
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_COGL_TYPEDEF_ASSERT(EXPRESSION)
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#else
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#define _COGL_STATIC_ASSERT(EXPRESSION, MESSAGE) \
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_COGL_TYPEDEF_ASSERT(EXPRESSION)
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/* So that we can safely use _Static_assert() if we want to add
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* assertions to internal headers we define it to a NOP here
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* if it's not supported by the compiler. */
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#define _Static_assert(EXPRESSION, MESSAGE)
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#endif
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#endif /* __COGL_UTIL_H */
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13
configure.ac
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configure.ac
@ -935,6 +935,19 @@ AM_PROG_CC_C_O
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AC_ISC_POSIX
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AC_C_CONST
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dnl ============================================================
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dnl Compiler features
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dnl ============================================================
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AC_TRY_COMPILE([],
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[
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_Static_assert (1, "");
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int
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main (int argc, char **argv)
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{
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return 0;
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}
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],
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[AC_DEFINE([HAVE_STATIC_ASSERT], [1], [Whether _Static_assert can be used or not])])
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dnl ================================================================
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dnl Libtool stuff.
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@ -9,9 +9,9 @@
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within Cogl. Cogl doesn't export the symbols for this data type so
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we just directly include the source instead */
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#define _COGL_IN_TEST_BITMASK
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#include <cogl/cogl-bitmask.h>
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#include <cogl/cogl-bitmask.c>
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#define _COGL_IN_TEST_BITMASK
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#include <cogl/cogl-util.c>
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typedef struct
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