Utility macros to handle different features and behavior in different compilers. More...

#include "orconfig.h"
#include <inttypes.h>

Macros
#define	PRINTF_FORMAT_ATTR printf

#define	SCANF_FORMAT_ATTR scanf

#define	CHECK_PRINTF(formatIdx, firstArg)

#define	CHECK_SCANF(formatIdx, firstArg)

#define	FALLTHROUGH

#define	GCC_VERSION 0

#define	DISABLE_GCC_WARNING(warning)

#define	ENABLE_GCC_WARNING(warning)

#define	__func__ "???"

#define	ENUM_BF(t) t

#define	ATTR_NORETURN

#define	ATTR_CONST

#define	ATTR_MALLOC

#define	ATTR_NORETURN

#define	ATTR_UNUSED

#define	ATTR_WUR

#define	PREDICT_LIKELY(exp) (exp)

#define	PREDICT_UNLIKELY(exp) (exp)

#define	STMT_NIL (void)0

#define	STMT_VOID(a) while (0) { (void)(a); }

#define	STMT_BEGIN do {

#define	STMT_END } while (0)

#define	OP_LT <

#define	OP_GT >

#define	OP_GE >=

#define	OP_LE <=

#define	OP_EQ ==

#define	OP_NE !=

#define	STRUCT_VAR_P(st, off) ((void) ( ((char)(st)) + (off) ) )

#define	SUBTYPE_P(p, subtype, basemember) ((void) ( ((char)(p)) - offsetof(subtype, basemember) ))

#define	ARRAY_LENGTH(x) ((sizeof(x)) / sizeof(x[0]))

#define	EAT_SEMICOLON struct dummy_semicolon_eater__

#define	POSSIBLE(expr) (expr)

Detailed Description

Utility macros to handle different features and behavior in different compilers.

Definition in file compat_compiler.h.

Macro Definition Documentation

◆ ARRAY_LENGTH

#define ARRAY_LENGTH ( x ) ((sizeof(x)) / sizeof(x[0]))

Macro: Yields the number of elements in array x.

Definition at line 241 of file compat_compiler.h.

◆ EAT_SEMICOLON

#define EAT_SEMICOLON struct dummy_semicolon_eater__

"Eat" a semicolon that somebody puts at the end of a top-level macro.

Frequently, we want to declare a macro that people will use at file scope, and we want to allow people to put a semicolon after the macro.

This declaration of a struct can be repeated any number of times, and takes a trailing semicolon afterwards.

Definition at line 252 of file compat_compiler.h.

◆ ENUM_BF

#define ENUM_BF ( t ) t

Wrapper for having a bitfield of an enumerated type. Where possible, we just use the enumerated type (so the compiler can help us and notice problems), but if enumerated types are unsigned, we must use unsigned, so that the loss of precision doesn't make large values negative.

Definition at line 149 of file compat_compiler.h.

◆ POSSIBLE

#define POSSIBLE ( expr ) (expr)

Tell our static analysis tool to believe that (clang's scan-build or coverity scan) that an expression might be true. We use this to suppress dead-code warnings.

Definition at line 265 of file compat_compiler.h.

◆ STMT_NIL

#define STMT_NIL (void)0

Expands to a syntactically valid empty statement.

Definition at line 189 of file compat_compiler.h.

◆ STMT_VOID

#define STMT_VOID ( a ) while (0) { (void)(a); }

Expands to a syntactically valid empty statement, explicitly (void)ing its argument.

Definition at line 193 of file compat_compiler.h.

◆ STRUCT_VAR_P

#define STRUCT_VAR_P	(	st,
		off
	)	((void) ( ((char)(st)) + (off) ) )

Macro: yield a pointer to the field at position off within the structure st. Example:

  struct a_t { int foo; int bar; } x;
  ptrdiff_t bar_offset = offsetof(struct a_t, bar);
  int *bar_p = STRUCT_VAR_P(&x, bar_offset);
  *bar_p = 3;

Definition at line 226 of file compat_compiler.h.

◆ SUBTYPE_P

#define SUBTYPE_P	(	p,
		subtype,
		basemember
	)	((void) ( ((char)(p)) - offsetof(subtype, basemember) ))

Macro: yield a pointer to an enclosing structure given a pointer to a substructure at offset off. Example:

  struct base_t { ... };
  struct subtype_t { int x; struct base_t b; } x;
  struct base_t *bp = &x.base;
  struct *sp = SUBTYPE_P(bp, struct subtype_t, b);

Definition at line 237 of file compat_compiler.h.

Macros