Add gPXE into the source tree; build unified imagesyslinux-3.70-pre7

1 files changed, 65 insertions, 0 deletions

diff --git a/gpxe/src/include/assert.h b/gpxe/src/include/assert.h
new file mode 100644
index 00000000..93750a1e
--- /dev/null
+++ b/gpxe/src/include/assert.h
@@ -0,0 +1,65 @@
+#ifndef _ASSERT_H
+#define _ASSERT_H
+
+/** @file
+ *
+ * Assertions
+ *
+ * This file provides two assertion macros: assert() (for run-time
+ * assertions) and linker_assert() (for link-time assertions).
+ *
+ */
+
+#ifdef NDEBUG
+#define ASSERTING 0
+#else
+#define ASSERTING 1
+#endif
+
+/** printf() for assertions
+ *
+ * This function exists so that the assert() macro can expand to
+ * printf() calls without dragging the printf() prototype into scope.
+ *
+ * As far as the compiler is concerned, assert_printf() and printf() are
+ * completely unrelated calls; it's only at the assembly stage that
+ * references to the assert_printf symbol are collapsed into references
+ * to the printf symbol.
+ */
+extern int __attribute__ (( format ( printf, 1, 2 ) )) 
+assert_printf ( const char *fmt, ... ) asm ( "printf" );
+
+/**
+ * Assert a condition at run-time.
+ *
+ * If the condition is not true, a debug message will be printed.
+ * Assertions only take effect in debug-enabled builds (see DBG()).
+ *
+ * @todo Make an assertion failure abort the program
+ *
+ */
+#define assert( condition ) 						     \
+	do { 								     \
+		if ( ASSERTING && ! (condition) ) { 			     \
+			assert_printf ( "assert(%s) failed at %s line %d\n", \
+					#condition, __FILE__, __LINE__ );    \
+		} 							     \
+	} while ( 0 )
+
+/**
+ * Assert a condition at link-time.
+ *
+ * If the condition is not true, the link will fail with an unresolved
+ * symbol (error_symbol).
+ *
+ * This macro is gPXE-specific.  Do not use this macro in code
+ * intended to be portable.
+ *
+ */
+#define linker_assert( condition, error_symbol )	\
+        if ( ! (condition) ) {				\
+                extern void error_symbol ( void );	\
+                error_symbol();				\
+        }
+
+#endif /* _ASSERT_H */