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C/C++ Source or Header | 1993-05-06 | 22.7 KB | 970 lines

/* ---------------------------------------------------------------- * FILE * c.h * * DESCRIPTION * Fundamental C definitions. This is included by nearly * every .c file in postgres. * * TABLE OF CONTENTS * * When adding stuff to this file, please try and put stuff * into the relevent section, or add new sections as appropriate. * * section description * ------- ------------------------------------------------ * 1) palloc debugging defines * 2) bool, true, false, TRUE, FALSE * 3) __STDC__, non-ansi C definitions: * Pointer typedef, NULL * cpp magic macros * ARGS() prototype macro * type prefixes: const, signed, volatile, inline * * 4) standard system types * 5) malloc, free, malloc_debug stuff, new, delete, ALLOCATE * 6) IsValid macros for system types * 7) offsetof, lengthof, endof * 8) exception handling definitions, Assert, Trap, etc macros * 9) Min, Max, Abs macros * 10) LintCast, RevisionId, RcsId, SccsId macros * 11) SymbolDecl, ExternDecl macros * 12) externs * * NOTES * This file reorganized as a result of eliminating wastful * nested IsValid calls -cim 4/27/91 * * This file is MACHINE AND COMPILER dependent!!! (For now.) * * IDENTIFICATION * $Header: /private/postgres/src/lib/H/tmp/RCS/c.h,v 1.39 1992/07/13 07:40:12 hong Exp $ * ---------------------------------------------------------------- */ #ifndef CIncluded /* Include this file only once */ #define CIncluded 1 #define C_H "$Header: /private/postgres/src/lib/H/tmp/RCS/c.h,v 1.39 1992/07/13 07:40:12 hong Exp $" /* ---------------------------------------------------------------- * Section 1: palloc debugging defines * ---------------------------------------------------------------- */ /* ---------------- * file / line macros * * _FLD_ File/Line Data * _FLV_ File/Line Variables * _FLV_DCL_ File/Line Variable Declarations * * the FLD0 and FLV0 macros are for functions taking no arguments * ---------------- */ #define _FLD_ __FILE__, __LINE__, #define _FLD0_ __FILE__, __LINE__ #define _FLV_ _FL_file, int _FL_line, #define _FLV0_ _FL_file, int _FL_line #define _FLV_DCL_ char *_FL_file; int _FL_line; #define _FL_PRINT_ printf("f: %s l: %d ", _FL_file, _FL_line) /* ---------------- * storage managers * * These are experimental and are not supported in the code that * we distribute to other sites. * ---------------- */ #undef SONY_JUKEBOX #undef MAIN_MEMORY /* ---------------- * allocation debugging stuff * ---------------- */ #undef PALLOC_DEBUG #ifdef PALLOC_DEBUG #define palloc(size) palloc_debug(_FLD_ size) #define pfree(ptr) pfree_debug(_FLD_ ptr) #define MemoryContextAlloc(context, size) \ MemoryContextAlloc_Debug(_FLD_ context, size) #define MemoryContextFree(context, ptr) \ MemoryContextFree_Debug(_FLD_ context, ptr) #define AllocSetReset(set) AllocSetReset_debug(_FLD_ set) #define malloc(size) malloc_debug(_FLD_ size) #define free(ptr) free_debug(_FLD_ ptr) #endif /* PALLOC_DEBUG */ /* ------------------- * buffer pool pin count debugging stuff * ------------------- */ #undef BUFMGR_DEBUG #ifdef BUFMGR_DEBUG #define IncrBufferRefCount(buffer) IncrBufferRefCount_Debug(_FLD_ buffer) #define ReleaseBuffer(buffer) ReleaseBuffer_Debug(_FLD_ buffer) #define ReleaseAndReadBuffer(buffer, relation, blockNum) \ ReleaseAndReadBuffer_Debug(_FLD_ buffer, relation, blockNum) #define ReadBuffer(reln, blockNum) ReadBuffer_Debug(_FLD_ reln, blockNum) #define WriteBuffer(buffer) WriteBuffer_Debug(_FLD_ buffer) /* #define PinBuffer(buf) PinBuffer_Debug(_FLD_ buf) #define UnpinBuffer(buf) UnpinBuffer_Debug(_FLD_ buf) */ #endif /* BUFMGR_DEBUG */ /* * Begin COMPILER DEPENDENT section */ /* ---------------------------------------------------------------- * Section 2: bool, true, false, TRUE, FALSE * ---------------------------------------------------------------- */ /* * bool -- * Boolean value, either true or false. * * used to be: * * typedef enum bool { * false, must be first, to be 0 * true * } bool; * * this may soon be moved to postgres.h -cim */ #define bool char #define false ((char) 0) #define true ((char) 1) typedef bool *BoolPtr; #define TRUE 1 #define FALSE 0 /* ---------------------------------------------------------------- * Section 3: __STDC__, non-ansi C definitions: * * cpp magic macros * ARGS() prototype macro * Pointer typedef, NULL * type prefixes: const, signed, volatile, inline * ---------------------------------------------------------------- */ #ifdef __STDC__ /* ANSI C */ #define PROTOTYPES /* * Pointer -- * Variable holding address of any memory resident object. */ typedef void *Pointer; #ifndef NULL /* * NULL -- * Null pointer. */ #define NULL ((void *) 0) #endif /* !defined(NULL) */ /* * CppIdentity -- * C preprocessor identity macro, returns the argument. */ #define CppIdentity(x)x /* * CppAsString -- * Convert the argument to a string, using the C preprocessor. */ #define CppAsString(identifier) #identifier /* * CppConcat -- * Concatenate two arguments together, using the C preprocessor. */ #define CppConcat(x, y) x##y #define CppConcat0(x, y) x##y #define CppConcat1(x, y) x##y #define CppConcat2(x, y) x##y #define CppConcat3(x, y) x##y #define CppConcat4(x, y) x##y #else /* !defined(__STDC__) */ /* NOT ANSI C */ /* * Pointer -- * Variable containing address of any memory resident object. */ typedef char *Pointer; #ifndef NULL /* * NULL -- * Null pointer. */ #define NULL 0 #endif /* !defined(NULL) */ /* * CppIdentity -- * C preprocessor identity macro, returns the argument. */ #define CppIdentity(x)x /* * CppAsString -- * Convert the argument to a string, using the C preprocessor. */ #define CppAsString(identifier) "identifier" /* * CppConcat -- * Concatenate two arguments together, using the C preprocessor. */ #ifdef sprite #define CppConcat(x, y) x/**/y #define CppConcat0(x, y) x/**/y #define CppConcat1(x, y) x/**/y #define CppConcat2(x, y) x/**/y #define CppConcat3(x, y) x/**/y #define CppConcat4(x, y) x/**/y #else #define CppConcat(x, y) CppIdentity(x)y #define CppConcat0(x, y) CppIdentity(x)y #define CppConcat1(x, y) CppIdentity(x)y #define CppConcat2(x, y) CppIdentity(x)y #define CppConcat3(x, y) CppIdentity(x)y #define CppConcat4(x, y) CppIdentity(x)y #endif /* sprite */ /* * const -- * Type modifier. Identifies read only variables. * * Example: * extern const Version RomVersion; */ #define const /* const */ /* * signed -- * Type modifier. Identifies signed integral types. */ #define signed /* signed */ /* * volatile -- * Type modifier. Identifies variables which may change in ways not * noticeable by the compiler, e.g. via asynchronous interrupts. * * Example: * extern volatile unsigned int NumberOfInterrupts; */ #define volatile /* volatile */ #endif /* !defined(__STDC__) */ /* NOT ANSI C */ #ifndef __GNUC__ /* GNU cc */ # define inline #endif #ifdef PROTOTYPES #define ARGS(args) args #else #define ARGS(args) (/*args*/) #endif /* ---------------------------------------------------------------- * Section 4: standard system types * ---------------------------------------------------------------- */ /* * End COMPILER DEPENDENT section */ /* * Begin COMPILER AND HARDWARE DEPENDENT section */ /* * intN -- * Signed integer, AT LEAST N BITS IN SIZE, * used for numerical computations. */ typedef signed char int8; /* >= 8 bits */ typedef signed short int16; /* >= 16 bits */ typedef signed long int32; /* >= 32 bits */ /* * AsInt8 -- * Coerce the argument to int8. * * Note: * This macro must be used to reference all int8 variables, because * * o Not all compilers support the signed char type. * o Depending on the compiler and/or machine, char * types can be either signed or unsigned. */ #define AsInt8(n) ((int) (((n) & 0x80) ? (~0x7f | (n)) : (n))) /* * uintN -- * Unsigned integer, AT LEAST N BITS IN SIZE, * used for numerical computations. */ typedef unsigned char uint8; /* >= 8 bits */ typedef unsigned short uint16; /* >= 16 bits */ typedef unsigned long uint32; /* >= 32 bits */ /* * floatN -- * Floating point number, AT LEAST N BITS IN SIZE, * used for numerical computations. * * Since sizeof(floatN) may be > sizeof(char *), always pass * floatN by reference. */ typedef float float32data; typedef double float64data; typedef float *float32; typedef double *float64; /* * AsUint8 -- * Coerce the argument to uint8. * * Note: * This macro must be used to reference all int8 variables, because * * o Not all compilers support the unsigned char type. * o Depending on the compiler and/or machine, char * types can be either signed or unsigned. */ #define AsUint8(n) ((unsigned) ((n) & 0xff)) /* * boolN -- * Boolean value, AT LEAST N BITS IN SIZE. */ typedef uint8 bool8; /* >= 8 bits */ typedef uint16 bool16; /* >= 16 bits */ typedef uint32 bool32; /* >= 32 bits */ /* * bitsN -- * Unit of bitwise operation, AT LEAST N BITS IN SIZE. */ typedef uint8 bits8; /* >= 8 bits */ typedef uint16 bits16; /* >= 16 bits */ typedef uint32 bits32; /* >= 32 bits */ /* * wordN -- * Unit of storage, AT LEAST N BITS IN SIZE, * used to fetch/store data. */ typedef uint8 word8; /* >= 8 bits */ typedef uint16 word16; /* >= 16 bits */ typedef uint32 word32; /* >= 32 bits */ /* * IoChar -- * Either a character or EOF, as returned by getchar. */ typedef int IoChar; /* * Address -- * Address of any memory resident object. * * Note: * This differs from Pointer type in that an object of type * Pointer contains an address, whereas an object of type * Address is an address (e.g. a constant). * * Example: * extern Address EndOfMemory; * extern Pointer TopOfStack; */ typedef char Address[]; /* * Size -- * Size of any memory resident object, as returned by sizeof. */ typedef unsigned int Size; /* * Index -- * Index into any memory resident array. * * Note: * Indices are non negative. */ typedef unsigned int Index; /* * Count -- * Generic counter type. */ typedef unsigned int Count; /* * Offset -- * Offset into any memory resident array. * * Note: * This differs from an Index in that an Index is always * non negative, whereas Offset may be negative. */ typedef signed int Offset; /* * String -- * String of characters. */ typedef char *String; typedef int *intPtr; /* * ReturnStatus -- * Return status from POSTGRES library functions. * * Note: * Most POSTGRES functions will not return a status. * In the future, there should be a global variable * which indicates the reason for the failure--the * identifier of an error message in the ERROR relation. */ typedef int ReturnStatus; /* ---------------------------------------------------------------- * Section 5: malloc, free, malloc_debug stuff * new, delete macros * ---------------------------------------------------------------- */ #ifdef PALLOC_DEBUG extern char * /* as defined in /usr/lib/lint/llib-lc */ malloc_debug ARGS(( String file, int line, Size nBytes )); extern /* void */ /* as defined in /usr/lib/lint/llib-lc */ free_debug ARGS(( String file, int line, char *p )); #else /* PALLOC_DEBUG */ /* the free and malloc definition is wrong. This conflicts with flex-generated parsers, who define free() and malloc() using void types (kai) */ #ifdef __STDC__ extern void free ARGS((void * __ptr)); extern void * malloc ARGS((unsigned int __size)); #else extern char * /* as defined in /usr/lib/lint/llib-lc */ malloc ARGS(( Size nBytes )); extern /* void */ /* as defined in /usr/lib/lint/llib-lc */ free ARGS(( char *p )); #endif /* __STDC__ */ #endif /* PALLOC_DEBUG */ /* * new -- * Allocate a new instance of the given type. * * Note: * Does NOT work with arrays. Use newv instead. */ #define new(type) LintCast(type *, malloc(sizeof (type))) /* * newv -- * Allocate a new array. */ #define newv(type, n) LintCast(type *, malloc(sizeof (type) * (n))) /* * delete -- * Free allocated storage. * * Note: * The variable is set to null to help catch errors. */ #define delete(pointer) (free((char *) (pointer)), (pointer) = NULL) /* * ALLOCATE() macro */ #define ALLOCATE(foo) (foo) palloc(sizeof(struct CppConcat(_,foo))) /* ---------------------------------------------------------------- * Section 6: IsValid macros for system types * ---------------------------------------------------------------- */ /* * BoolIsValid -- * True iff bool is valid. */ #define BoolIsValid(boolean) ((boolean) == false || (boolean) == true) #define boolIsValid(b) \ ((bool) ((b) == false || (b) == true)) /* * PointerIsValid -- * True iff pointer is valid. */ #define PointerIsValid(pointer) (bool)((Pointer)(pointer) != NULL) /* * PointerIsInBounds -- * True iff pointer is within given bounds. * * Note: * Assumes the bounded interval to be [min,max), * i.e. closed on the left and open on the right. */ #define PointerIsInBounds(pointer, min, max) \ ((min) <= (pointer) && (pointer) < (max)) /* * PointerIsAligned -- * True iff pointer is properly aligned to point to the given type. */ #define PointerIsAligned(pointer, type) \ (((long)(pointer) % (sizeof (type))) == 0) /* * SizeIsValid -- * True iff size is valid. * * Note: * Assumes that Size is an unsigned type. * * Assumes valid size to be in the interval (0,infinity). */ #define SizeIsValid(size) ((size) > 0) /* * SizeIsInBounds -- * True iff size is within given bounds. * * Note: * Assumes Size is an unsigned type. * * Assumes the bounded interval to be (0,max]. */ #define SizeIsInBounds(size, max) (0 < (size) && (size) <= (max)) /* * IndexIsValid -- * True iff index is valid. * * Note: * Assumes Index is an unsigned type. * * Assumes valid index to be in the interval [0,infinity). */ #define IndexIsValid(index) true /* * IndexIsInBounds -- * True iff index is within given bounds. * * Note: * Assumes Index is an unsigned type. * * Assumes the bounded interval to be [0,max). */ #define IndexIsInBounds(index, max) ((index) < (max)) /* * CountIsValid -- * True iff count is valid * * Note: * Assumes Count is an unsigned type. * * Assumes valid counts to be in the interval [0,infinity). */ #define CountIsValid(count) true /* * CountIsInBounds -- * True iff count is within given bounds. * * Note: * Assumes Count is an unsigned type. * * Assumes the bounded interval to be [0,max). */ #define CountIsInBounds(count, max) IndexIsInBounds(count, max) /* * OffsetIsInBounds -- * True iff offset is within given bounds. * * Note: * Assumes the bounded interval to be [0,max). */ #define OffsetIsInBounds(offset, min, max) \ ((min) <= (offset) && (offset) < (max)) /* * StringIsValid -- * True iff string is valid. */ #define StringIsValid(string) PointerIsValid(string) /* * ReturnStatusIsValid -- * True iff return status is valid. * * Note: * Assumes that a library function can only indicate * sucess or failure. */ #define ReturnStatusIsValid(status) \ ((-1) <= (status) && (status) <= 0) /* * ReturnStatusIsSucess -- * True iff return status indicates a sucessful call. */ #define SucessfulReturnStatus(status) \ ((status) >= 0) /* * End COMPILER AND HARDWARE DEPENDENT section */ /* * Begin COMPILER AND MACHINE INDEPENDENT section */ /* ---------------------------------------------------------------- * Section 7: offsetof, lengthof, endof * ---------------------------------------------------------------- */ /* * offsetof -- * Offset of a structure/union field within that structure/union. */ /* * under Linux definded in /usr/lib/gcc-lib/.../include/stddef.h */ #undef offsetof #define offsetof(type, field) ((long) &((type *)0)->field) /* * lengthof -- * Number of elements in an array. */ #define lengthof(array) (sizeof (array) / sizeof ((array)[0])) /* * endof -- * Address of the element one past the last in an array. */ #define endof(array) (&array[lengthof(array)]) /* ---------------------------------------------------------------- * Section 8: exception handling definitions * Assert, Trap, etc macros * ---------------------------------------------------------------- */ /* * Exception Handling definitions */ typedef String ExcMessage; typedef struct Exception { ExcMessage message; } Exception; extern Exception FailedAssertion; extern Exception BadArg; extern Exception BadState; extern void ExceptionalCondition ARGS(( const String conditionName, const Exception *exceptionP, const String details, const String fileName, int lineNumber )); /* * NO_ASSERT_CHECKING, if defined, turns off all the assertions. * - plai 9/5/90 * * It should _NOT_ be undef'ed in releases or in benchmark copies * * #undef NO_ASSERT_CHECKING */ /* * Trap -- * Generates an exception if the given condition is true. * * Note: * The trailing else is used to allow this macro to be used in * single statement if, while, for, and do expressions, e.g. * * if (tapeCount < 3) * Trap(fd == -1, FailedFileOpen); * * if (requests > 0) * Assert(!QueueIsEmpty(queue)); * * if (!beenHere) * AssertArg(PointerIsValid(initP)); * * if (beenHere) * AssertState(ModuleInitialized) */ #define Trap(condition, exception) \ if (condition) \ ExceptionalCondition(CppAsString(condition), &(exception), \ (String)NULL, __FILE__, __LINE__); \ else /* * TrapMacro is the same as Trap but it's intended for use in macros: * * #define foo(x) (AssertM(x != 0) && bar(x)) * * Isn't CPP fun? */ #define TrapMacro(condition, exception) \ ((bool) ((! condition) || \ (ExceptionalCondition(CppAsString(condition), \ &(exception), \ (String) NULL, __FILE__, __LINE__), \ false))) #ifdef NO_ASSERT_CHECKING #define Assert(condition) #define AssertMacro(condition) true #define AssertArg(condition) #define AssertState(condition) #else #define Assert(condition) \ Trap(!(condition), FailedAssertion) #define AssertMacro(condition) \ TrapMacro(!(condition), FailedAssertion) #define AssertArg(condition) \ Trap(!(condition), BadArg) #define AssertState(condition) \ Trap(!(condition), BadState) #endif /* NO_ASSERT_CHECKING */ /* * LogTrap -- * Generates an exception with a message if the given condition is true. * * Note: * The trailing else is used to allow this macro to be used in * single statement if, while, for, and do expressions, e.g. * * if (slowPointer) * LogTrap(!PointerIsValid(pointer), NoMoreMemory, * ("size 0x%x", size)); * * if (requests > 0) * LogAssert(!QueueIsEmpty(queue), ("req. %d", requests)); * * if (PointerIsSlowPointer(pointer)) * LogAssertArg(pointer >= &end, ("ptr 0x%x", pointer)); * * if (!slowPointer) * LogAssertState(IsStackable(Current), * ("state %d", typeof(current))) */ #define LogTrap(condition, exception, printArgs) \ if (condition) \ ExceptionalCondition(CppAsString(condition), &(exception), \ form printArgs, __FILE__, __LINE__); \ else /* * LogTrapMacro is the same as LogTrap but it's intended for use in macros: * * #define foo(x) (LogAssertMacro(x != 0, "yow!") && bar(x)) */ #define LogTrapMacro(condition, exception, printArgs) \ ((bool) ((! condition) || \ (ExceptionalCondition(CppAsString(condition), \ &(exception), \ form printArgs, __FILE__, __LINE__), \ false))) #ifdef NO_ASSERT_CHECKING #define LogAssert(condition, printArgs) #define LogAssertMacro(condition, printArgs) true #define LogAssertArg(condition, printArgs) #define LogAssertState(condition, printArgs) #else #define LogAssert(condition, printArgs) \ LogTrap(!(condition), FailedAssertion, printArgs) #define LogAssertMacro(condition, printArgs) \ LogTrapMacro(!(condition), FailedAssertion, printArgs) #define LogAssertArg(condition, printArgs) \ LogTrap(!(condition), BadArg, printArgs) #define LogAssertState(condition, printArgs) \ LogTrap(!(condition), BadState, printArgs) #endif /* NO_ASSERT_CHECKING */ /* ---------------------------------------------------------------- * Section 9: Min, Max, Abs macros * ---------------------------------------------------------------- */ /* * Max -- * Return the maximum of two numbers. */ #define Max(x, y) ((x) > (y) ? (x) : (y)) #ifndef MAX #define MAX(x, y) ((x) > (y) ? (x) : (y)) #endif /* MAX */ /* * Min -- * Return the minimum of two numbers. */ #define Min(x, y) ((x) < (y) ? (x) : (y)) #ifndef MIN #define MIN(x, y) ((x) < (y) ? (x) : (y)) #endif /* MIN */ /* * Abs -- * Return the absolute value of the argument. */ #define Abs(x) ((x) >= 0 ? (x) : -(x)) /* ---------------------------------------------------------------- * Section 10: LintCast, RevisionId, RcsId, SccsId macros * ---------------------------------------------------------------- */ /* * LintCast -- * Coerce value to a given type, without upsetting lint. * Use *ONLY* for *VALID* casts that lint complains about. * * Note: * The ?: operator is used to avoid "variable unused" warnings. */ #ifdef lint # define LintCast(type, value) ((value) ? ((type) 0) : ((type) 0)) # define RevisionId(var, value) #else /* !defined(lint) */ # define LintCast(type, value) ((type) (value)) # ifdef XSTR # define RevisionId(var, value) static char *var = value # else /* !defined(XSTR) */ # define RevisionId(var, value) static char var[] = value # endif /* !defined(XSTR) */ #endif /* !defined(lint) */ /* ---------------- * RcsId and SccsId macros.. * ---------------- */ #if (defined(lint) || defined(SABER)) #define SccsId(id) #define RcsId(id) #else #define SccsId(id) RevisionId(_SccsId_, id) #define RcsId(id) RevisionId(_RcsId_, id) #endif /* ---------------------------------------------------------------- * Section 11: SymbolDecl, ExternDecl macros * ---------------------------------------------------------------- */ /* * SymbolDecl -- * ExternDecl -- * Dynamic function and data symbol declaration macros. * * Sample usage: * * extern int fooValue; * extern void foo ARGS((void)); * // more declarations ... * * #define yourfilename_SYMBOLS \ * ExternDecl(fooValue), \ * SymbolDecl(foo) * * // DO *NOT* INCLUDE A TRAILING ^ COMMA */ #ifndef SABER #define constantquote(x)" #define prefixquote(x)constantquote(x)x #define prefixquoteunder(x)prefixquote(_)x #define symstring(x)prefixquoteunder(x)" #define SymbolDecl(_symbol_) \ { (func_ptr)_symbol_, symstring(_symbol_) } #define ExternDecl(_external_) \ { (data_ptr)&(_external_), symstring(_external_) } #else #define SymbolDecl(_symbol_) #define ExternDecl(_external_) #endif /* ---------------------------------------------------------------- * Section 12: externs * ---------------------------------------------------------------- */ /* ---------------- * form is used by assert and the exception handling stuff * ---------------- */ extern String form ARGS(( int, ... )); /* ---------------- * end of c.h * ---------------- */ #endif /* !defined(CIncluded) */