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This was achieved by partially undoing changelist 24817, including an accidental corruption of eventgen.pl. Copied from Perforce Change: 24877 ServerID: perforce.ravenbrook.com
280 lines
6.5 KiB
C
280 lines
6.5 KiB
C
/* impl.h.check: ASSERTION INTERFACE
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*
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* $Id$
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* $HopeName: MMsrc!check.h(trunk.18) $
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* Copyright (c) 2001 Ravenbrook Limited.
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*
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* .aver: This header defines a family of AVER and NOTREACHED macros.
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* These macros should be used to instrument and annotate code with
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* invariants, and so provide both interface and internal consistency
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* checks.
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*
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* .comment: Non-obvious AVER statements should always be accompanied by
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* a comment.
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*
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* .disable: When assertions are disabled, AVER expands to something
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* which evaluates the condition but discards the result. Compilers
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* will throw the code away, but check its syntax.
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*
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* .trans.level-check: CheckLevel itself is not checked anywhere.
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*/
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#ifndef check_h
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#define check_h
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#include "config.h"
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#include "misc.h"
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#include "mpslib.h"
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/* CheckLevel -- Control check method behaviour; see impl.c.assert */
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extern unsigned CheckLevel;
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enum {
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CheckNONE = 0,
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CheckSHALLOW = 1,
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CheckDEEP = 2
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};
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/* AVER, AVERT -- MPM assertions
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*
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* AVER and AVERT are used to assert conditions within the MPM.
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* In white-hot varieties, all assertions compile away to nothing.
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*/
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#if defined(MPS_HOT_WHITE)
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#define AVER(cond) DISCARD(cond)
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#define AVERT(type, val) DISCARD(type ## Check(val))
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#define AVER_CRITICAL(cond) DISCARD(cond)
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#define AVERT_CRITICAL(type, val) DISCARD(type ## Check(val))
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#elif defined(MPS_HOT_RED)
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#define AVER(cond) ASSERT(cond, #cond)
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#define AVERT(type, val) ASSERT(type ## Check(val), \
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"TypeCheck " #type ": " #val)
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#define AVER_CRITICAL(cond) DISCARD(cond)
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#define AVERT_CRITICAL(type, val) DISCARD(type ## Check(val))
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#elif defined(MPS_COOL)
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#define AVER(cond) ASSERT(cond, #cond)
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#define AVERT(type, val) ASSERT(type ## Check(val), \
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"TypeCheck " #type ": " #val)
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#define AVER_CRITICAL(cond) ASSERT(cond, #cond)
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#define AVERT_CRITICAL(type, val) ASSERT(type ## Check(val), \
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"TypeCheck " #type ": " #val)
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#else
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#error "No heat defined."
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#endif
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/* AssertHandler -- the assert handler */
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typedef void (*AssertHandler)(const char *cond, const char *id,
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const char *file, unsigned line);
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extern AssertHandler AssertInstall(AssertHandler handler);
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extern AssertHandler AssertDefault(void);
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/* internals for actually asserting */
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extern void AssertFail1(const char *s);
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#define ASSERT(cond, condstring) \
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BEGIN \
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if(cond) NOOP; else \
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AssertFail1(condstring "\n" __FILE__ "\n" STR(__LINE__)); \
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END
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/* NOTREACHED -- control should never reach this statement */
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#if defined(MPS_HOT_WHITE)
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#define NOTREACHED NOOP
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#else
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#define NOTREACHED \
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BEGIN \
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AssertFail1("unreachable statement" "\n" __FILE__ "\n" STR(__LINE__)); \
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END
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#endif
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/* CHECKT -- check type simply
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*
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* Must be thread safe. See design.mps.interface.c.thread-safety
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* and design.mps.interface.c.check.space.
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*/
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#define CHECKT(type, val) ((val) != NULL && (val)->sig == type ## Sig)
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#if defined(MPS_HOT_WHITE)
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#define CHECKS(type, val) DISCARD(CHECKT(type, val))
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#define CHECKL(cond) DISCARD(cond)
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#define CHECKD(type, val) DISCARD(CHECKT(type, val))
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#define CHECKD_NOSIG(type, val) DISCARD((val) != NULL)
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#define CHECKU(type, val) DISCARD(CHECKT(type, val))
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#define CHECKU_NOSIG(type, val) DISCARD((val) != NULL)
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#elif defined(MPS_HOT_RED)
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#define CHECKS(type, val) ASSERT(CHECKT(type, val), \
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"SigCheck " #type ": " #val)
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#define CHECKL(cond) DISCARD(cond)
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#define CHECKD(type, val) DISCARD(CHECKT(type, val))
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#define CHECKD_NOSIG(type, val) DISCARD((val) != NULL)
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#define CHECKU(type, val) DISCARD(CHECKT(type, val))
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#define CHECKU_NOSIG(type, val) DISCARD((val) != NULL)
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#elif defined(MPS_COOL)
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/* CHECKS -- Check Signature */
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#define CHECKS(type, val) ASSERT(CHECKT(type, val), \
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"SigCheck " #type ": " #val)
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/* CHECKL -- Check Local Invariant
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*
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* Could make this an expression using ?:
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*/
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#define CHECKL(cond) \
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BEGIN \
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switch(CheckLevel) { \
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case CheckNONE: \
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NOOP; \
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break; \
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case CheckSHALLOW: \
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case CheckDEEP: \
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ASSERT(cond, #cond); \
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break; \
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} \
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END
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/* CHECKD -- Check Down */
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#define CHECKD(type, val) \
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BEGIN \
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switch(CheckLevel) { \
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case CheckNONE: \
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NOOP; \
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break; \
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case CheckSHALLOW: \
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ASSERT(CHECKT(type, val), \
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"SigCheck " #type ": " #val); \
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break; \
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case CheckDEEP: \
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ASSERT(type ## Check(val), \
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"TypeCheck " #type ": " #val); \
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break; \
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} \
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END
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/* CHECKD_NOSIG -- Check Down for a type with no signature */
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#define CHECKD_NOSIG(type, val) \
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BEGIN \
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switch(CheckLevel) { \
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case CheckNONE: \
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NOOP; \
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break; \
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case CheckSHALLOW: \
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ASSERT((val) != NULL, \
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"NullCheck " #type ": " #val); \
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break; \
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case CheckDEEP: \
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ASSERT(type ## Check(val), \
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"TypeCheck " #type ": " #val); \
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break; \
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} \
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END
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/* CHECKU -- Check Up */
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#define CHECKU(type, val) \
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BEGIN \
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switch(CheckLevel) { \
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case CheckNONE: \
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NOOP; \
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break; \
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case CheckSHALLOW: \
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case CheckDEEP: \
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ASSERT(CHECKT(type, val), \
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"SigCheck " #type ": " #val); \
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break; \
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} \
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END
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/* CHECKU_NOSIG -- Check Up for a type with no signature */
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#define CHECKU_NOSIG(type, val) \
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BEGIN \
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switch(CheckLevel) { \
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case CheckNONE: \
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NOOP; \
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break; \
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case CheckSHALLOW: \
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case CheckDEEP: \
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ASSERT((val) != NULL, \
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"NullCheck " #type ": " #val); \
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break; \
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} \
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END
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#else
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#error "No heat defined."
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#endif
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/* CHECKLVALUE &c -- type compatibility checking
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*
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* .check.macros: The CHECK* macros use some C trickery to attempt to
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* verify that certain types and fields are equivalent. They do not
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* do a complete job. This trickery is justified by the security gained
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* in knowing that impl.h.mps matches the MPM. See also
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* mail.richard.1996-08-07.09-49. [This paragraph is intended to
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* satisfy rule.impl.trick.]
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*/
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#define CHECKLVALUE(lv1, lv2) \
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((void)sizeof((lv1) = (lv2)), (void)sizeof((lv2) = (lv1)), TRUE)
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#define CHECKTYPE(t1, t2) \
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(sizeof(t1) == sizeof(t2) && \
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CHECKLVALUE(*((t1 *)0), *((t2 *)0)))
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#define CHECKFIELDAPPROX(s1, f1, s2, f2) \
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(sizeof(((s1 *)0)->f1) == sizeof(((s2 *)0)->f2) && \
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offsetof(s1, f1) == offsetof(s2, f2))
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#define CHECKFIELD(s1, f1, s2, f2) \
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(CHECKFIELDAPPROX(s1, f1, s2, f2) && \
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CHECKLVALUE(((s1 *)0)->f1, ((s2 *)0)->f2))
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#endif /* check_h */
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