* polluting the namespace with lots of stuff...
*
*
- * Portions Copyright (c) 1996-2011, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1996-2013, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* src/include/c.h
* 3) standard system types
* 4) IsValid macros for system types
* 5) offsetof, lengthof, endof, alignment
- * 6) widely useful macros
- * 7) random stuff
- * 8) system-specific hacks
+ * 6) assertions
+ * 7) widely useful macros
+ * 8) random stuff
+ * 9) system-specific hacks
*
* NOTE: since this file is included by both frontend and backend modules, it's
* almost certainly wrong to put an "extern" declaration here. typedefs and
#ifndef C_H
#define C_H
-/*
- * We have to include stdlib.h here because it defines many of these macros
- * on some platforms, and we only want our definitions used if stdlib.h doesn't
- * have its own. The same goes for stddef and stdarg if present.
- */
+#include "postgres_ext.h"
+
+/* Must undef pg_config_ext.h symbols before including pg_config.h */
+#undef PG_INT64_TYPE
#include "pg_config.h"
#include "pg_config_manual.h" /* must be after pg_config.h */
-#if !defined(WIN32) && !defined(__CYGWIN__) /* win32 will include further
- * down */
+
+#if !defined(WIN32) && !defined(__CYGWIN__) /* win32 includes further down */
#include "pg_config_os.h" /* must be before any system header files */
#endif
-#include "postgres_ext.h"
-#if _MSC_VER >= 1400 || defined(WIN64)
+#if _MSC_VER >= 1400 || defined(HAVE_CRTDEFS_H)
#define errcode __msvc_errcode
#include <crtdefs.h>
#undef errcode
#endif
+/*
+ * We have to include stdlib.h here because it defines many of these macros
+ * on some platforms, and we only want our definitions used if stdlib.h doesn't
+ * have its own. The same goes for stddef and stdarg if present.
+ */
+
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#if defined(WIN32) || defined(__CYGWIN__)
#include <fcntl.h> /* ensure O_BINARY is available */
#endif
-#ifdef HAVE_SUPPORTDEFS_H
-#include <SupportDefs.h>
-#endif
#if defined(WIN32) || defined(__CYGWIN__)
/* We have to redefine some system functions after they are included above. */
/*
* Common Postgres datatype names (as used in the catalogs)
*/
-typedef int16 int2;
-typedef int32 int4;
typedef float float4;
typedef double float8;
Oid elemtype;
int dim1;
int lbound1;
- int2 values[1]; /* VARIABLE LENGTH ARRAY */
+ int16 values[1]; /* VARIABLE LENGTH ARRAY */
} int2vector; /* VARIABLE LENGTH STRUCT */
typedef struct
* PointerIsValid
* True iff pointer is valid.
*/
-#define PointerIsValid(pointer) ((void*)(pointer) != NULL)
+#define PointerIsValid(pointer) ((const void*)(pointer) != NULL)
/*
* PointerIsAligned
#define MAXALIGN_DOWN(LEN) TYPEALIGN_DOWN(MAXIMUM_ALIGNOF, (LEN))
/* ----------------------------------------------------------------
- * Section 6: widely useful macros
+ * Section 6: assertions
+ * ----------------------------------------------------------------
+ */
+
+/*
+ * USE_ASSERT_CHECKING, if defined, turns on all the assertions.
+ * - plai 9/5/90
+ *
+ * It should _NOT_ be defined in releases or in benchmark copies
+ */
+
+/*
+ * Assert() can be used in both frontend and backend code. In frontend code it
+ * just calls the standard assert, if it's available. If use of assertions is
+ * not configured, it does nothing.
+ */
+#ifndef USE_ASSERT_CHECKING
+
+#define Assert(condition)
+#define AssertMacro(condition) ((void)true)
+#define AssertArg(condition)
+#define AssertState(condition)
+#define Trap(condition, errorType)
+#define TrapMacro(condition, errorType) (true)
+
+#elif defined(FRONTEND)
+
+#include <assert.h>
+#define Assert(p) assert(p)
+#define AssertMacro(p) ((void) assert(p))
+#define AssertArg(condition) assert(condition)
+#define AssertState(condition) assert(condition)
+#else /* USE_ASSERT_CHECKING && !FRONTEND */
+
+/*
+ * Trap
+ * Generates an exception if the given condition is true.
+ */
+#define Trap(condition, errorType) \
+ do { \
+ if ((assert_enabled) && (condition)) \
+ ExceptionalCondition(CppAsString(condition), (errorType), \
+ __FILE__, __LINE__); \
+ } while (0)
+
+/*
+ * TrapMacro is the same as Trap but it's intended for use in macros:
+ *
+ * #define foo(x) (AssertMacro(x != 0), bar(x))
+ *
+ * Isn't CPP fun?
+ */
+#define TrapMacro(condition, errorType) \
+ ((bool) ((! assert_enabled) || ! (condition) || \
+ (ExceptionalCondition(CppAsString(condition), (errorType), \
+ __FILE__, __LINE__), 0)))
+
+#define Assert(condition) \
+ Trap(!(condition), "FailedAssertion")
+
+#define AssertMacro(condition) \
+ ((void) TrapMacro(!(condition), "FailedAssertion"))
+
+#define AssertArg(condition) \
+ Trap(!(condition), "BadArgument")
+
+#define AssertState(condition) \
+ Trap(!(condition), "BadState")
+#endif /* USE_ASSERT_CHECKING && !FRONTEND */
+
+
+/*
+ * Macros to support compile-time assertion checks.
+ *
+ * If the "condition" (a compile-time-constant expression) evaluates to false,
+ * throw a compile error using the "errmessage" (a string literal).
+ *
+ * gcc 4.6 and up supports _Static_assert(), but there are bizarre syntactic
+ * placement restrictions. These macros make it safe to use as a statement
+ * or in an expression, respectively.
+ *
+ * Otherwise we fall back on a kluge that assumes the compiler will complain
+ * about a negative width for a struct bit-field. This will not include a
+ * helpful error message, but it beats not getting an error at all.
+ */
+#ifdef HAVE__STATIC_ASSERT
+#define StaticAssertStmt(condition, errmessage) \
+ do { _Static_assert(condition, errmessage); } while(0)
+#define StaticAssertExpr(condition, errmessage) \
+ ({ StaticAssertStmt(condition, errmessage); true; })
+#else /* !HAVE__STATIC_ASSERT */
+#define StaticAssertStmt(condition, errmessage) \
+ ((void) sizeof(struct { int static_assert_failure : (condition) ? 1 : -1; }))
+#define StaticAssertExpr(condition, errmessage) \
+ StaticAssertStmt(condition, errmessage)
+#endif /* HAVE__STATIC_ASSERT */
+
+
+/*
+ * Compile-time checks that a variable (or expression) has the specified type.
+ *
+ * AssertVariableIsOfType() can be used as a statement.
+ * AssertVariableIsOfTypeMacro() is intended for use in macros, eg
+ * #define foo(x) (AssertVariableIsOfTypeMacro(x, int), bar(x))
+ *
+ * If we don't have __builtin_types_compatible_p, we can still assert that
+ * the types have the same size. This is far from ideal (especially on 32-bit
+ * platforms) but it provides at least some coverage.
+ */
+#ifdef HAVE__BUILTIN_TYPES_COMPATIBLE_P
+#define AssertVariableIsOfType(varname, typename) \
+ StaticAssertStmt(__builtin_types_compatible_p(__typeof__(varname), typename), \
+ CppAsString(varname) " does not have type " CppAsString(typename))
+#define AssertVariableIsOfTypeMacro(varname, typename) \
+ ((void) StaticAssertExpr(__builtin_types_compatible_p(__typeof__(varname), typename), \
+ CppAsString(varname) " does not have type " CppAsString(typename)))
+#else /* !HAVE__BUILTIN_TYPES_COMPATIBLE_P */
+#define AssertVariableIsOfType(varname, typename) \
+ StaticAssertStmt(sizeof(varname) == sizeof(typename), \
+ CppAsString(varname) " does not have type " CppAsString(typename))
+#define AssertVariableIsOfTypeMacro(varname, typename) \
+ ((void) StaticAssertExpr(sizeof(varname) == sizeof(typename), \
+ CppAsString(varname) " does not have type " CppAsString(typename)))
+#endif /* HAVE__BUILTIN_TYPES_COMPATIBLE_P */
+
+
+/* ----------------------------------------------------------------
+ * Section 7: widely useful macros
* ----------------------------------------------------------------
*/
/*
} while (0)
+/*
+ * Mark a point as unreachable in a portable fashion. This should preferably
+ * be something that the compiler understands, to aid code generation.
+ * In assert-enabled builds, we prefer abort() for debugging reasons.
+ */
+#if defined(HAVE__BUILTIN_UNREACHABLE) && !defined(USE_ASSERT_CHECKING)
+#define pg_unreachable() __builtin_unreachable()
+#elif defined(_MSC_VER) && !defined(USE_ASSERT_CHECKING)
+#define pg_unreachable() __assume(0)
+#else
+#define pg_unreachable() abort()
+#endif
+
+
+/*
+ * Function inlining support -- Allow modules to define functions that may be
+ * inlined, if the compiler supports it.
+ *
+ * The function bodies must be defined in the module header prefixed by
+ * STATIC_IF_INLINE, protected by a cpp symbol that the module's .c file must
+ * define. If the compiler doesn't support inline functions, the function
+ * definitions are pulled in by the .c file as regular (not inline) symbols.
+ *
+ * The header must also declare the functions' prototypes, protected by
+ * !PG_USE_INLINE.
+ */
+#ifdef PG_USE_INLINE
+#define STATIC_IF_INLINE static inline
+#else
+#define STATIC_IF_INLINE
+#endif /* PG_USE_INLINE */
+
/* ----------------------------------------------------------------
- * Section 7: random stuff
+ * Section 8: random stuff
* ----------------------------------------------------------------
*/
#define STATUS_WAITING (2)
+/*
+ * Append PG_USED_FOR_ASSERTS_ONLY to definitions of variables that are only
+ * used in assert-enabled builds, to avoid compiler warnings about unused
+ * variables in assert-disabled builds.
+ */
+#ifdef USE_ASSERT_CHECKING
+#define PG_USED_FOR_ASSERTS_ONLY
+#else
+#define PG_USED_FOR_ASSERTS_ONLY __attribute__((unused))
+#endif
+
+
/* gettext domain name mangling */
/*
/* ----------------------------------------------------------------
- * Section 8: system-specific hacks
+ * Section 9: system-specific hacks
*
* This should be limited to things that absolutely have to be
* included in every source file. The port-specific header file
extern int
snprintf(char *str, size_t count, const char *fmt,...)
/* This extension allows gcc to check the format string */
-__attribute__((format(printf, 3, 4)));
+__attribute__((format(PG_PRINTF_ATTRIBUTE, 3, 4)));
#endif
#if !HAVE_DECL_VSNPRINTF
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