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authorFlorian Weimer <fweimer@redhat.com>2017-12-04 20:54:24 +0100
committerFlorian Weimer <fweimer@redhat.com>2017-12-04 20:56:08 +0100
commit934855246d5dbc0d454ceef5f89ad1b7e4c1db35 (patch)
tree186b87225ea1222e8d6ac501b4c92c99d7714225 /support/check.h
parent96b06a19e602557bfa668ad9c1a9f29044d3e774 (diff)
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support: Add TEST_COMPARE macro
Diffstat (limited to 'support/check.h')
-rw-r--r--support/check.h61
1 files changed, 61 insertions, 0 deletions
diff --git a/support/check.h b/support/check.h
index bdcd12952a..55a6f09f42 100644
--- a/support/check.h
+++ b/support/check.h
@@ -86,6 +86,67 @@ void support_test_verify_exit_impl (int status, const char *file, int line,
does not support reporting failures from a DSO. */
void support_record_failure (void);
+/* Compare the two integers LEFT and RIGHT and report failure if they
+ are different. */
+#define TEST_COMPARE(left, right) \
+ ({ \
+ /* + applies the integer promotions, for bitfield support. */ \
+ typedef __typeof__ (+ (left)) __left_type; \
+ typedef __typeof__ (+ (right)) __right_type; \
+ __left_type __left_value = (left); \
+ __right_type __right_value = (right); \
+ /* Prevent use with floating-point and boolean types. */ \
+ _Static_assert ((__left_type) 1.0 == (__left_type) 1.5, \
+ "left value has floating-point type"); \
+ _Static_assert ((__right_type) 1.0 == (__right_type) 1.5, \
+ "right value has floating-point type"); \
+ /* Prevent accidental use with larger-than-long long types. */ \
+ _Static_assert (sizeof (__left_value) <= sizeof (long long), \
+ "left value fits into long long"); \
+ _Static_assert (sizeof (__right_value) <= sizeof (long long), \
+ "right value fits into long long"); \
+ /* Make sure that integer conversions does not alter the sign. */ \
+ enum \
+ { \
+ __left_is_unsigned = (__left_type) -1 > 0, \
+ __right_is_unsigned = (__right_type) -1 > 0, \
+ __unsigned_left_converts_to_wider = (__left_is_unsigned \
+ && (sizeof (__left_value) \
+ < sizeof (__right_value))), \
+ __unsigned_right_converts_to_wider = (__right_is_unsigned \
+ && (sizeof (__right_value) \
+ < sizeof (__left_value))) \
+ }; \
+ _Static_assert (__left_is_unsigned == __right_is_unsigned \
+ || __unsigned_left_converts_to_wider \
+ || __unsigned_right_converts_to_wider, \
+ "integer conversions may alter sign of operands"); \
+ /* Compare the value. */ \
+ if (__left_value != __right_value) \
+ /* Pass the sign for printing the correct value. */ \
+ support_test_compare_failure \
+ (__FILE__, __LINE__, \
+ #left, __left_value, __left_value < 0, sizeof (__left_type), \
+ #right, __right_value, __right_value < 0, sizeof (__right_type)); \
+ })
+
+/* Internal implementation of TEST_COMPARE. LEFT_NEGATIVE and
+ RIGHT_NEGATIVE are used to store the sign separately, so that both
+ unsigned long long and long long arguments fit into LEFT_VALUE and
+ RIGHT_VALUE, and the function can still print the original value.
+ LEFT_SIZE and RIGHT_SIZE specify the size of the argument in bytes,
+ for hexadecimal formatting. */
+void support_test_compare_failure (const char *file, int line,
+ const char *left_expr,
+ long long left_value,
+ int left_negative,
+ int left_size,
+ const char *right_expr,
+ long long right_value,
+ int right_negative,
+ int right_size);
+
+
/* Internal function called by the test driver. */
int support_report_failure (int status)
__attribute__ ((weak, warn_unused_result));