/* * Copyright 1988, 1989 Hans-J. Boehm, Alan J. Demers * Copyright (c) 1991-1994 by Xerox Corporation. All rights reserved. * Copyright (c) 1996-1999 by Silicon Graphics. All rights reserved. * Copyright (c) 1999-2001 by Hewlett-Packard Company. All rights reserved. * * * THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED * OR IMPLIED. ANY USE IS AT YOUR OWN RISK. * * Permission is hereby granted to use or copy this program * for any purpose, provided the above notices are retained on all copies. * Permission to modify the code and to distribute modified code is granted, * provided the above notices are retained, and a notice that the code was * modified is included with the above copyright notice. */ # ifndef GC_PRIVATE_H # define GC_PRIVATE_H #if defined(mips) && defined(SYSTYPE_BSD) && defined(sony_news) /* sony RISC NEWS, NEWSOS 4 */ # define BSD_TIME /* typedef long ptrdiff_t; -- necessary on some really old systems */ #endif #if defined(mips) && defined(SYSTYPE_BSD43) /* MIPS RISCOS 4 */ # define BSD_TIME #endif #ifdef BSD_TIME # include # include # include #endif /* BSD_TIME */ # ifndef GC_H # include "gc.h" # endif # ifndef GC_MARK_H # include "../gc_mark.h" # endif # ifndef GCCONFIG_H # include "gcconfig.h" # endif typedef GC_word word; typedef GC_signed_word signed_word; typedef int GC_bool; # define TRUE 1 # define FALSE 0 typedef char * ptr_t; /* A generic pointer to which we can add */ /* byte displacements. */ /* Preferably identical to caddr_t, if it */ /* exists. */ # ifndef HEADERS_H # include "gc_hdrs.h" # endif #if defined(__STDC__) # include # if !(defined( sony_news ) ) # include # endif # define VOLATILE volatile #else # ifdef MSWIN32 # include # endif # define VOLATILE #endif #if 0 /* defined(__GNUC__) doesn't work yet */ # define EXPECT(expr, outcome) __builtin_expect(expr,outcome) /* Equivalent to (expr), but predict that usually (expr)==outcome. */ #else # define EXPECT(expr, outcome) (expr) #endif /* __GNUC__ */ # ifndef GC_LOCKS_H # include "gc_locks.h" # endif # ifdef STACK_GROWS_DOWN # define COOLER_THAN > # define HOTTER_THAN < # define MAKE_COOLER(x,y) if ((word)(x)+(y) > (word)(x)) {(x) += (y);} \ else {(x) = (word)ONES;} # define MAKE_HOTTER(x,y) (x) -= (y) # else # define COOLER_THAN < # define HOTTER_THAN > # define MAKE_COOLER(x,y) if ((word)(x)-(y) < (word)(x)) {(x) -= (y);} else {(x) = 0;} # define MAKE_HOTTER(x,y) (x) += (y) # endif #if defined(AMIGA) && defined(__SASC) # define GC_FAR __far #else # define GC_FAR #endif /*********************************/ /* */ /* Definitions for conservative */ /* collector */ /* */ /*********************************/ /*********************************/ /* */ /* Easily changeable parameters */ /* */ /*********************************/ /* #define STUBBORN_ALLOC */ /* Enable stubborm allocation, and thus a limited */ /* form of incremental collection w/o dirty bits. */ /* #define ALL_INTERIOR_POINTERS */ /* Forces all pointers into the interior of an */ /* object to be considered valid. Also causes the */ /* sizes of all objects to be inflated by at least */ /* one byte. This should suffice to guarantee */ /* that in the presence of a compiler that does */ /* not perform garbage-collector-unsafe */ /* optimizations, all portable, strictly ANSI */ /* conforming C programs should be safely usable */ /* with malloc replaced by GC_malloc and free */ /* calls removed. There are several disadvantages: */ /* 1. There are probably no interesting, portable, */ /* strictly ANSI conforming C programs. */ /* 2. This option makes it hard for the collector */ /* to allocate space that is not ``pointed to'' */ /* by integers, etc. Under SunOS 4.X with a */ /* statically linked libc, we empiricaly */ /* observed that it would be difficult to */ /* allocate individual objects larger than 100K. */ /* Even if only smaller objects are allocated, */ /* more swap space is likely to be needed. */ /* Fortunately, much of this will never be */ /* touched. */ /* If you can easily avoid using this option, do. */ /* If not, try to keep individual objects small. */ /* This is now really controlled at startup, */ /* through GC_all_interior_pointers. */ #define PRINTSTATS /* Print garbage collection statistics */ /* For less verbose output, undefine in reclaim.c */ #define PRINTTIMES /* Print the amount of time consumed by each garbage */ /* collection. */ #define PRINTBLOCKS /* Print object sizes associated with heap blocks, */ /* whether the objects are atomic or composite, and */ /* whether or not the block was found to be empty */ /* during the reclaim phase. Typically generates */ /* about one screenful per garbage collection. */ #undef PRINTBLOCKS #ifdef SILENT # ifdef PRINTSTATS # undef PRINTSTATS # endif # ifdef PRINTTIMES # undef PRINTTIMES # endif # ifdef PRINTNBLOCKS # undef PRINTNBLOCKS # endif #endif #if defined(PRINTSTATS) && !defined(GATHERSTATS) # define GATHERSTATS #endif #if defined(PRINTSTATS) || !defined(SMALL_CONFIG) # define CONDPRINT /* Print some things if GC_print_stats is set */ #endif #define GC_INVOKE_FINALIZERS() GC_notify_or_invoke_finalizers() #define MERGE_SIZES /* Round up some object sizes, so that fewer distinct */ /* free lists are actually maintained. This applies */ /* only to the top level routines in misc.c, not to */ /* user generated code that calls GC_allocobj and */ /* GC_allocaobj directly. */ /* Slows down average programs slightly. May however */ /* substantially reduce fragmentation if allocation */ /* request sizes are widely scattered. */ /* May save significant amounts of space for obj_map */ /* entries. */ #if defined(USE_MARK_BYTES) && !defined(ALIGN_DOUBLE) # define ALIGN_DOUBLE /* We use one byte for every 2 words, which doesn't allow for */ /* odd numbered words to have mark bits. */ #endif /* ALIGN_DOUBLE requires MERGE_SIZES at present. */ # if defined(ALIGN_DOUBLE) && !defined(MERGE_SIZES) # define MERGE_SIZES # endif #if !defined(DONT_ADD_BYTE_AT_END) # define EXTRA_BYTES GC_all_interior_pointers #else # define EXTRA_BYTES 0 #endif # ifndef LARGE_CONFIG # define MINHINCR 16 /* Minimum heap increment, in blocks of HBLKSIZE */ /* Must be multiple of largest page size. */ # define MAXHINCR 2048 /* Maximum heap increment, in blocks */ # else # define MINHINCR 64 # define MAXHINCR 4096 # endif # define TIME_LIMIT 50 /* We try to keep pause times from exceeding */ /* this by much. In milliseconds. */ # define BL_LIMIT GC_black_list_spacing /* If we need a block of N bytes, and we have */ /* a block of N + BL_LIMIT bytes available, */ /* and N > BL_LIMIT, */ /* but all possible positions in it are */ /* blacklisted, we just use it anyway (and */ /* print a warning, if warnings are enabled). */ /* This risks subsequently leaking the block */ /* due to a false reference. But not using */ /* the block risks unreasonable immediate */ /* heap growth. */ /*********************************/ /* */ /* Stack saving for debugging */ /* */ /*********************************/ #ifdef SAVE_CALL_CHAIN /* * Number of frames and arguments to save in objects allocated by * debugging allocator. */ # ifndef SAVE_CALL_COUNT # define NFRAMES 6 /* Number of frames to save. Even for */ /* alignment reasons. */ # else # define NFRAMES ((SAVE_CALL_COUNT + 1) & ~1) # endif # define NARGS 2 /* Mumber of arguments to save for each call. */ # define NEED_CALLINFO /* Fill in the pc and argument information for up to NFRAMES of my */ /* callers. Ignore my frame and my callers frame. */ struct callinfo; void GC_save_callers GC_PROTO((struct callinfo info[NFRAMES])); void GC_print_callers GC_PROTO((struct callinfo info[NFRAMES])); #else # ifdef GC_ADD_CALLER # define NFRAMES 1 # define NARGS 0 # define NEED_CALLINFO # endif #endif #ifdef NEED_CALLINFO struct callinfo { word ci_pc; /* Caller, not callee, pc */ # if NARGS > 0 word ci_arg[NARGS]; /* bit-wise complement to avoid retention */ # endif # if defined(ALIGN_DOUBLE) && (NFRAMES * (NARGS + 1)) % 2 == 1 /* Likely alignment problem. */ word ci_dummy; # endif }; #endif /*********************************/ /* */ /* OS interface routines */ /* */ /*********************************/ #ifdef BSD_TIME # undef CLOCK_TYPE # undef GET_TIME # undef MS_TIME_DIFF # define CLOCK_TYPE struct timeval # define GET_TIME(x) { struct rusage rusage; \ getrusage (RUSAGE_SELF, &rusage); \ x = rusage.ru_utime; } # define MS_TIME_DIFF(a,b) ((double) (a.tv_sec - b.tv_sec) * 1000.0 \ + (double) (a.tv_usec - b.tv_usec) / 1000.0) #else /* !BSD_TIME */ # if defined(MSWIN32) || defined(MSWINCE) # include # include # define CLOCK_TYPE DWORD # define GET_TIME(x) x = GetTickCount() # define MS_TIME_DIFF(a,b) ((long)((a)-(b))) # else /* !MSWIN32, !MSWINCE, !BSD_TIME */ # include # if !defined(__STDC__) && defined(SPARC) && defined(SUNOS4) clock_t clock(); /* Not in time.h, where it belongs */ # endif # if defined(FREEBSD) && !defined(CLOCKS_PER_SEC) # include # define CLOCKS_PER_SEC CLK_TCK # endif # if !defined(CLOCKS_PER_SEC) # define CLOCKS_PER_SEC 1000000 /* * This is technically a bug in the implementation. ANSI requires that * CLOCKS_PER_SEC be defined. But at least under SunOS4.1.1, it isn't. * Also note that the combination of ANSI C and POSIX is incredibly gross * here. The type clock_t is used by both clock() and times(). But on * some machines these use different notions of a clock tick, CLOCKS_PER_SEC * seems to apply only to clock. Hence we use it here. On many machines, * including SunOS, clock actually uses units of microseconds (which are * not really clock ticks). */ # endif # define CLOCK_TYPE clock_t # define GET_TIME(x) x = clock() # define MS_TIME_DIFF(a,b) ((unsigned long) \ (1000.0*(double)((a)-(b))/(double)CLOCKS_PER_SEC)) # endif /* !MSWIN32 */ #endif /* !BSD_TIME */ /* We use bzero and bcopy internally. They may not be available. */ # if defined(SPARC) && defined(SUNOS4) # define BCOPY_EXISTS # endif # if defined(M68K) && defined(AMIGA) # define BCOPY_EXISTS # endif # if defined(M68K) && defined(NEXT) # define BCOPY_EXISTS # endif # if defined(VAX) # define BCOPY_EXISTS # endif # if defined(AMIGA) # include # define BCOPY_EXISTS # endif # if defined(MACOSX) # define BCOPY_EXISTS # endif # ifndef BCOPY_EXISTS # include # define BCOPY(x,y,n) memcpy(y, x, (size_t)(n)) # define BZERO(x,n) memset(x, 0, (size_t)(n)) # else # define BCOPY(x,y,n) bcopy((char *)(x),(char *)(y),(int)(n)) # define BZERO(x,n) bzero((char *)(x),(int)(n)) # endif /* HBLKSIZE aligned allocation. 0 is taken to mean failure */ /* space is assumed to be cleared. */ /* In the case os USE_MMAP, the argument must also be a */ /* physical page size. */ /* GET_MEM is currently not assumed to retrieve 0 filled space, */ /* though we should perhaps take advantage of the case in which */ /* does. */ struct hblk; /* See below. */ # ifdef PCR char * real_malloc(); # define GET_MEM(bytes) HBLKPTR(real_malloc((size_t)bytes + GC_page_size) \ + GC_page_size-1) # else # ifdef OS2 void * os2_alloc(size_t bytes); # define GET_MEM(bytes) HBLKPTR((ptr_t)os2_alloc((size_t)bytes \ + GC_page_size) \ + GC_page_size-1) # else # if defined(NEXT) || defined(MACOSX) || defined(DOS4GW) || \ (defined(AMIGA) && !defined(GC_AMIGA_FASTALLOC)) # define GET_MEM(bytes) HBLKPTR((size_t) \ calloc(1, (size_t)bytes + GC_page_size) \ + GC_page_size-1) # else # ifdef MSWIN32 extern ptr_t GC_win32_get_mem(); # define GET_MEM(bytes) (struct hblk *)GC_win32_get_mem(bytes) # else # ifdef MACOS # if defined(USE_TEMPORARY_MEMORY) extern Ptr GC_MacTemporaryNewPtr(size_t size, Boolean clearMemory); # define GET_MEM(bytes) HBLKPTR( \ GC_MacTemporaryNewPtr(bytes + GC_page_size, true) \ + GC_page_size-1) # else # define GET_MEM(bytes) HBLKPTR( \ NewPtrClear(bytes + GC_page_size) + GC_page_size-1) # endif # else # ifdef MSWINCE extern ptr_t GC_wince_get_mem(); # define GET_MEM(bytes) (struct hblk *)GC_wince_get_mem(bytes) # else # if defined(AMIGA) && defined(GC_AMIGA_FASTALLOC) extern void *GC_amiga_get_mem(size_t size); define GET_MEM(bytes) HBLKPTR((size_t) \ GC_amiga_get_mem((size_t)bytes + GC_page_size) \ + GC_page_size-1) # else extern ptr_t GC_unix_get_mem(); # define GET_MEM(bytes) (struct hblk *)GC_unix_get_mem(bytes) # endif # endif # endif # endif # endif # endif # endif /* Delay any interrupts or signals that may abort this thread. Data */ /* structures are in a consistent state outside this pair of calls. */ /* ANSI C allows both to be empty (though the standard isn't very */ /* clear on that point). Standard malloc implementations are usually */ /* neither interruptable nor thread-safe, and thus correspond to */ /* empty definitions. */ /* It probably doesn't make any sense to declare these to be nonempty */ /* if the code is being optimized, since signal safety relies on some */ /* ordering constraints that are typically not obeyed by optimizing */ /* compilers. */ # ifdef PCR # define DISABLE_SIGNALS() \ PCR_Th_SetSigMask(PCR_allSigsBlocked,&GC_old_sig_mask) # define ENABLE_SIGNALS() \ PCR_Th_SetSigMask(&GC_old_sig_mask, NIL) # else # if defined(THREADS) || defined(AMIGA) \ || defined(MSWIN32) || defined(MSWINCE) || defined(MACOS) \ || defined(DJGPP) || defined(NO_SIGNALS) /* Also useful for debugging. */ /* Should probably use thr_sigsetmask for GC_SOLARIS_THREADS. */ # define DISABLE_SIGNALS() # define ENABLE_SIGNALS() # else # define DISABLE_SIGNALS() GC_disable_signals() void GC_disable_signals(); # define ENABLE_SIGNALS() GC_enable_signals() void GC_enable_signals(); # endif # endif /* * Stop and restart mutator threads. */ # ifdef PCR # include "th/PCR_ThCtl.h" # define STOP_WORLD() \ PCR_ThCtl_SetExclusiveMode(PCR_ThCtl_ExclusiveMode_stopNormal, \ PCR_allSigsBlocked, \ PCR_waitForever) # define START_WORLD() \ PCR_ThCtl_SetExclusiveMode(PCR_ThCtl_ExclusiveMode_null, \ PCR_allSigsBlocked, \ PCR_waitForever); # else # if defined(GC_SOLARIS_THREADS) || defined(GC_WIN32_THREADS) \ || defined(GC_PTHREADS) void GC_stop_world(); void GC_start_world(); # define STOP_WORLD() GC_stop_world() # define START_WORLD() GC_start_world() # else # define STOP_WORLD() # define START_WORLD() # endif # endif /* Abandon ship */ # ifdef PCR # define ABORT(s) PCR_Base_Panic(s) # else # ifdef SMALL_CONFIG # define ABORT(msg) abort(); # else GC_API void GC_abort(); # define ABORT(msg) GC_abort(msg); # endif # endif /* Exit abnormally, but without making a mess (e.g. out of memory) */ # ifdef PCR # define EXIT() PCR_Base_Exit(1,PCR_waitForever) # else # define EXIT() (void)exit(1) # endif /* Print warning message, e.g. almost out of memory. */ # define WARN(msg,arg) (*GC_current_warn_proc)(msg, (GC_word)(arg)) extern GC_warn_proc GC_current_warn_proc; /* Get environment entry */ #if !defined(NO_GETENV) # define GETENV(name) getenv(name) #else # define GETENV(name) 0 #endif /*********************************/ /* */ /* Word-size-dependent defines */ /* */ /*********************************/ #if CPP_WORDSZ == 32 # define WORDS_TO_BYTES(x) ((x)<<2) # define BYTES_TO_WORDS(x) ((x)>>2) # define LOGWL ((word)5) /* log[2] of CPP_WORDSZ */ # define modWORDSZ(n) ((n) & 0x1f) /* n mod size of word */ # if ALIGNMENT != 4 # define UNALIGNED # endif #endif #if CPP_WORDSZ == 64 # define WORDS_TO_BYTES(x) ((x)<<3) # define BYTES_TO_WORDS(x) ((x)>>3) # define LOGWL ((word)6) /* log[2] of CPP_WORDSZ */ # define modWORDSZ(n) ((n) & 0x3f) /* n mod size of word */ # if ALIGNMENT != 8 # define UNALIGNED # endif #endif #define WORDSZ ((word)CPP_WORDSZ) #define SIGNB ((word)1 << (WORDSZ-1)) #define BYTES_PER_WORD ((word)(sizeof (word))) #define ONES ((word)(signed_word)(-1)) #define divWORDSZ(n) ((n) >> LOGWL) /* divide n by size of word */ /*********************/ /* */ /* Size Parameters */ /* */ /*********************/ /* heap block size, bytes. Should be power of 2 */ #ifndef HBLKSIZE # ifdef SMALL_CONFIG # define CPP_LOG_HBLKSIZE 10 # else # if (CPP_WORDSZ == 32) || (defined(HPUX) && defined(HP_PA)) /* HPUX/PA seems to use 4K pages with the 64 bit ABI */ # define CPP_LOG_HBLKSIZE 12 # else # define CPP_LOG_HBLKSIZE 13 # endif # endif #else # if HBLKSIZE == 512 # define CPP_LOG_HBLKSIZE 9 # endif # if HBLKSIZE == 1024 # define CPP_LOG_HBLKSIZE 10 # endif # if HBLKSIZE == 2048 # define CPP_LOG_HBLKSIZE 11 # endif # if HBLKSIZE == 4096 # define CPP_LOG_HBLKSIZE 12 # endif # if HBLKSIZE == 8192 # define CPP_LOG_HBLKSIZE 13 # endif # if HBLKSIZE == 16384 # define CPP_LOG_HBLKSIZE 14 # endif # ifndef CPP_LOG_HBLKSIZE --> fix HBLKSIZE # endif # undef HBLKSIZE #endif # define CPP_HBLKSIZE (1 << CPP_LOG_HBLKSIZE) # define LOG_HBLKSIZE ((word)CPP_LOG_HBLKSIZE) # define HBLKSIZE ((word)CPP_HBLKSIZE) /* max size objects supported by freelist (larger objects may be */ /* allocated, but less efficiently) */ #define CPP_MAXOBJBYTES (CPP_HBLKSIZE/2) #define MAXOBJBYTES ((word)CPP_MAXOBJBYTES) #define CPP_MAXOBJSZ BYTES_TO_WORDS(CPP_HBLKSIZE/2) #define MAXOBJSZ ((word)CPP_MAXOBJSZ) # define divHBLKSZ(n) ((n) >> LOG_HBLKSIZE) # define HBLK_PTR_DIFF(p,q) divHBLKSZ((ptr_t)p - (ptr_t)q) /* Equivalent to subtracting 2 hblk pointers. */ /* We do it this way because a compiler should */ /* find it hard to use an integer division */ /* instead of a shift. The bundled SunOS 4.1 */ /* o.w. sometimes pessimizes the subtraction to */ /* involve a call to .div. */ # define modHBLKSZ(n) ((n) & (HBLKSIZE-1)) # define HBLKPTR(objptr) ((struct hblk *)(((word) (objptr)) & ~(HBLKSIZE-1))) # define HBLKDISPL(objptr) (((word) (objptr)) & (HBLKSIZE-1)) /* Round up byte allocation requests to integral number of words, etc. */ # define ROUNDED_UP_WORDS(n) \ BYTES_TO_WORDS((n) + (WORDS_TO_BYTES(1) - 1 + EXTRA_BYTES)) # ifdef ALIGN_DOUBLE # define ALIGNED_WORDS(n) \ (BYTES_TO_WORDS((n) + WORDS_TO_BYTES(2) - 1 + EXTRA_BYTES) & ~1) # else # define ALIGNED_WORDS(n) ROUNDED_UP_WORDS(n) # endif # define SMALL_OBJ(bytes) ((bytes) < (MAXOBJBYTES - EXTRA_BYTES)) # define ADD_SLOP(bytes) ((bytes) + EXTRA_BYTES) # ifndef MIN_WORDS /* MIN_WORDS is the size of the smallest allocated object. */ /* 1 and 2 are the only valid values. */ /* 2 must be used if: */ /* - GC_gcj_malloc can be used for objects of requested */ /* size smaller than 2 words, or */ /* - USE_MARK_BYTES is defined. */ # if defined(USE_MARK_BYTES) || defined(GC_GCJ_SUPPORT) # define MIN_WORDS 2 /* Smallest allocated object. */ # else # define MIN_WORDS 1 # endif # endif /* * Hash table representation of sets of pages. This assumes it is * OK to add spurious entries to sets. * Used by black-listing code, and perhaps by dirty bit maintenance code. */ # ifdef LARGE_CONFIG # define LOG_PHT_ENTRIES 19 /* Collisions likely at 512K blocks, */ /* which is >= 2GB. Each table takes */ /* 64KB. */ # else # ifdef SMALL_CONFIG # define LOG_PHT_ENTRIES 14 /* Collisions are likely if heap grows */ /* to more than 16K hblks = 64MB. */ /* Each hash table occupies 2K bytes. */ # else /* default "medium" configuration */ # define LOG_PHT_ENTRIES 16 /* Collisions are likely if heap grows */ /* to more than 16K hblks >= 256MB. */ /* Each hash table occupies 8K bytes. */ # endif # endif # define PHT_ENTRIES ((word)1 << LOG_PHT_ENTRIES) # define PHT_SIZE (PHT_ENTRIES >> LOGWL) typedef word page_hash_table[PHT_SIZE]; # define PHT_HASH(addr) ((((word)(addr)) >> LOG_HBLKSIZE) & (PHT_ENTRIES - 1)) # define get_pht_entry_from_index(bl, index) \ (((bl)[divWORDSZ(index)] >> modWORDSZ(index)) & 1) # define set_pht_entry_from_index(bl, index) \ (bl)[divWORDSZ(index)] |= (word)1 << modWORDSZ(index) # define clear_pht_entry_from_index(bl, index) \ (bl)[divWORDSZ(index)] &= ~((word)1 << modWORDSZ(index)) /* And a dumb but thread-safe version of set_pht_entry_from_index. */ /* This sets (many) extra bits. */ # define set_pht_entry_from_index_safe(bl, index) \ (bl)[divWORDSZ(index)] = ONES /********************************************/ /* */ /* H e a p B l o c k s */ /* */ /********************************************/ /* heap block header */ #define HBLKMASK (HBLKSIZE-1) #define BITS_PER_HBLK (CPP_HBLKSIZE * 8) #define MARK_BITS_PER_HBLK (BITS_PER_HBLK/CPP_WORDSZ) /* upper bound */ /* We allocate 1 bit/word, unless USE_MARK_BYTES */ /* is defined. Only the first word */ /* in each object is actually marked. */ # ifdef USE_MARK_BYTES # define MARK_BITS_SZ (MARK_BITS_PER_HBLK/2) /* Unlike the other case, this is in units of bytes. */ /* We actually allocate only every second mark bit, since we */ /* force all objects to be doubleword aligned. */ /* However, each mark bit is allocated as a byte. */ # else # define MARK_BITS_SZ (MARK_BITS_PER_HBLK/CPP_WORDSZ) # endif /* We maintain layout maps for heap blocks containing objects of a given */ /* size. Each entry in this map describes a byte offset and has the */ /* following type. */ typedef unsigned char map_entry_type; struct hblkhdr { word hb_sz; /* If in use, size in words, of objects in the block. */ /* if free, the size in bytes of the whole block */ struct hblk * hb_next; /* Link field for hblk free list */ /* and for lists of chunks waiting to be */ /* reclaimed. */ struct hblk * hb_prev; /* Backwards link for free list. */ word hb_descr; /* object descriptor for marking. See */ /* mark.h. */ map_entry_type * hb_map; /* A pointer to a pointer validity map of the block. */ /* See GC_obj_map. */ /* Valid for all blocks with headers. */ /* Free blocks point to GC_invalid_map. */ unsigned char hb_obj_kind; /* Kind of objects in the block. Each kind */ /* identifies a mark procedure and a set of */ /* list headers. Sometimes called regions. */ unsigned char hb_flags; # define IGNORE_OFF_PAGE 1 /* Ignore pointers that do not */ /* point to the first page of */ /* this object. */ # define WAS_UNMAPPED 2 /* This is a free block, which has */ /* been unmapped from the address */ /* space. */ /* GC_remap must be invoked on it */ /* before it can be reallocated. */ /* Only set with USE_MUNMAP. */ unsigned short hb_last_reclaimed; /* Value of GC_gc_no when block was */ /* last allocated or swept. May wrap. */ /* For a free block, this is maintained */ /* only for USE_MUNMAP, and indicates */ /* when the header was allocated, or */ /* when the size of the block last */ /* changed. */ # ifdef USE_MARK_BYTES union { char _hb_marks[MARK_BITS_SZ]; /* The i'th byte is 1 if the object */ /* starting at word 2i is marked, 0 o.w. */ word dummy; /* Force word alignment of mark bytes. */ } _mark_byte_union; # define hb_marks _mark_byte_union._hb_marks # else word hb_marks[MARK_BITS_SZ]; /* Bit i in the array refers to the */ /* object starting at the ith word (header */ /* INCLUDED) in the heap block. */ /* The lsb of word 0 is numbered 0. */ /* Unused bits are invalid, and are */ /* occasionally set, e.g for uncollectable */ /* objects. */ # endif /* !USE_MARK_BYTES */ }; /* heap block body */ # define BODY_SZ (HBLKSIZE/sizeof(word)) struct hblk { # if 0 /* DISCARDWORDS no longer supported */ word garbage[DISCARD_WORDS]; # endif word hb_body[BODY_SZ]; }; # define OBJ_SZ_TO_BLOCKS(sz) \ divHBLKSZ(WORDS_TO_BYTES(sz) + HBLKSIZE-1) /* Size of block (in units of HBLKSIZE) needed to hold objects of */ /* given sz (in words). */ /* Object free list link */ # define obj_link(p) (*(ptr_t *)(p)) # define LOG_MAX_MARK_PROCS 6 # define MAX_MARK_PROCS (1 << LOG_MAX_MARK_PROCS) /* Root sets. Logically private to mark_rts.c. But we don't want the */ /* tables scanned, so we put them here. */ /* MAX_ROOT_SETS is the maximum number of ranges that can be */ /* registered as static roots. */ # ifdef LARGE_CONFIG # define MAX_ROOT_SETS 4096 # else # ifdef PCR # define MAX_ROOT_SETS 1024 # else # if defined(MSWIN32) || defined(MSWINCE) # define MAX_ROOT_SETS 1024 /* Under NT, we add only written pages, which can result */ /* in many small root sets. */ # else # define MAX_ROOT_SETS 256 # endif # endif # endif # define MAX_EXCLUSIONS (MAX_ROOT_SETS/4) /* Maximum number of segments that can be excluded from root sets. */ /* * Data structure for excluded static roots. */ struct exclusion { ptr_t e_start; ptr_t e_end; }; /* Data structure for list of root sets. */ /* We keep a hash table, so that we can filter out duplicate additions. */ /* Under Win32, we need to do a better job of filtering overlaps, so */ /* we resort to sequential search, and pay the price. */ struct roots { ptr_t r_start; ptr_t r_end; # if !defined(MSWIN32) && !defined(MSWINCE) struct roots * r_next; # endif GC_bool r_tmp; /* Delete before registering new dynamic libraries */ }; #if !defined(MSWIN32) && !defined(MSWINCE) /* Size of hash table index to roots. */ # define LOG_RT_SIZE 6 # define RT_SIZE (1 << LOG_RT_SIZE) /* Power of 2, may be != MAX_ROOT_SETS */ #endif /* Lists of all heap blocks and free lists */ /* as well as other random data structures */ /* that should not be scanned by the */ /* collector. */ /* These are grouped together in a struct */ /* so that they can be easily skipped by the */ /* GC_mark routine. */ /* The ordering is weird to make GC_malloc */ /* faster by keeping the important fields */ /* sufficiently close together that a */ /* single load of a base register will do. */ /* Scalars that could easily appear to */ /* be pointers are also put here. */ /* The main fields should precede any */ /* conditionally included fields, so that */ /* gc_inl.h will work even if a different set */ /* of macros is defined when the client is */ /* compiled. */ struct _GC_arrays { word _heapsize; word _max_heapsize; word _requested_heapsize; /* Heap size due to explicit expansion */ ptr_t _last_heap_addr; ptr_t _prev_heap_addr; word _large_free_bytes; /* Total bytes contained in blocks on large object free */ /* list. */ word _large_allocd_bytes; /* Total number of bytes in allocated large objects blocks. */ /* For the purposes of this counter and the next one only, a */ /* large object is one that occupies a block of at least */ /* 2*HBLKSIZE. */ word _max_large_allocd_bytes; /* Maximum number of bytes that were ever allocated in */ /* large object blocks. This is used to help decide when it */ /* is safe to split up a large block. */ word _words_allocd_before_gc; /* Number of words allocated before this */ /* collection cycle. */ # ifndef SEPARATE_GLOBALS word _words_allocd; /* Number of words allocated during this collection cycle */ # endif word _words_wasted; /* Number of words wasted due to internal fragmentation */ /* in large objects, or due to dropping blacklisted */ /* blocks, since last gc. Approximate. */ word _words_finalized; /* Approximate number of words in objects (and headers) */ /* That became ready for finalization in the last */ /* collection. */ word _non_gc_bytes_at_gc; /* Number of explicitly managed bytes of storage */ /* at last collection. */ word _mem_freed; /* Number of explicitly deallocated words of memory */ /* since last collection. */ ptr_t _scratch_end_ptr; ptr_t _scratch_last_end_ptr; /* Used by headers.c, and can easily appear to point to */ /* heap. */ GC_mark_proc _mark_procs[MAX_MARK_PROCS]; /* Table of user-defined mark procedures. There is */ /* a small number of these, which can be referenced */ /* by DS_PROC mark descriptors. See gc_mark.h. */ # ifndef SEPARATE_GLOBALS ptr_t _objfreelist[MAXOBJSZ+1]; /* free list for objects */ ptr_t _aobjfreelist[MAXOBJSZ+1]; /* free list for atomic objs */ # endif ptr_t _uobjfreelist[MAXOBJSZ+1]; /* uncollectable but traced objs */ /* objects on this and auobjfreelist */ /* are always marked, except during */ /* garbage collections. */ # ifdef ATOMIC_UNCOLLECTABLE ptr_t _auobjfreelist[MAXOBJSZ+1]; # endif /* uncollectable but traced objs */ # ifdef GATHERSTATS word _composite_in_use; /* Number of words in accessible composite */ /* objects. */ word _atomic_in_use; /* Number of words in accessible atomic */ /* objects. */ # endif # ifdef USE_MUNMAP word _unmapped_bytes; # endif # ifdef MERGE_SIZES unsigned _size_map[WORDS_TO_BYTES(MAXOBJSZ+1)]; /* Number of words to allocate for a given allocation request in */ /* bytes. */ # endif # ifdef STUBBORN_ALLOC ptr_t _sobjfreelist[MAXOBJSZ+1]; # endif /* free list for immutable objects */ map_entry_type * _obj_map[MAXOBJSZ+1]; /* If not NIL, then a pointer to a map of valid */ /* object addresses. _obj_map[sz][i] is j if the */ /* address block_start+i is a valid pointer */ /* to an object at block_start + */ /* WORDS_TO_BYTES(BYTES_TO_WORDS(i) - j) */ /* I.e. j is a word displacement from the */ /* object beginning. */ /* The entry is OBJ_INVALID if the corresponding */ /* address is not a valid pointer. It is */ /* OFFSET_TOO_BIG if the value j would be too */ /* large to fit in the entry. (Note that the */ /* size of these entries matters, both for */ /* space consumption and for cache utilization. */ # define OFFSET_TOO_BIG 0xfe # define OBJ_INVALID 0xff # define MAP_ENTRY(map, bytes) (map)[bytes] # define MAP_ENTRIES HBLKSIZE # define MAP_SIZE MAP_ENTRIES # define CPP_MAX_OFFSET (OFFSET_TOO_BIG - 1) # define MAX_OFFSET ((word)CPP_MAX_OFFSET) /* The following are used only if GC_all_interior_ptrs != 0 */ # define VALID_OFFSET_SZ \ (CPP_MAX_OFFSET > WORDS_TO_BYTES(CPP_MAXOBJSZ)? \ CPP_MAX_OFFSET+1 \ : WORDS_TO_BYTES(CPP_MAXOBJSZ)+1) char _valid_offsets[VALID_OFFSET_SZ]; /* GC_valid_offsets[i] == TRUE ==> i */ /* is registered as a displacement. */ # define OFFSET_VALID(displ) \ (GC_all_interior_pointers || GC_valid_offsets[displ]) char _modws_valid_offsets[sizeof(word)]; /* GC_valid_offsets[i] ==> */ /* GC_modws_valid_offsets[i%sizeof(word)] */ # ifdef STUBBORN_ALLOC page_hash_table _changed_pages; /* Stubborn object pages that were changes since last call to */ /* GC_read_changed. */ page_hash_table _prev_changed_pages; /* Stubborn object pages that were changes before last call to */ /* GC_read_changed. */ # endif # if defined(PROC_VDB) || defined(MPROTECT_VDB) page_hash_table _grungy_pages; /* Pages that were dirty at last */ /* GC_read_dirty. */ # endif # ifdef MPROTECT_VDB VOLATILE page_hash_table _dirty_pages; /* Pages dirtied since last GC_read_dirty. */ # endif # ifdef PROC_VDB page_hash_table _written_pages; /* Pages ever dirtied */ # endif # ifdef LARGE_CONFIG # if CPP_WORDSZ > 32 # define MAX_HEAP_SECTS 4096 /* overflows at roughly 64 GB */ # else # define MAX_HEAP_SECTS 768 /* Separately added heap sections. */ # endif # else # ifdef SMALL_CONFIG # define MAX_HEAP_SECTS 128 /* Roughly 1GB */ # else # define MAX_HEAP_SECTS 384 /* Roughly 3GB */ # endif # endif struct HeapSect { ptr_t hs_start; word hs_bytes; } _heap_sects[MAX_HEAP_SECTS]; # if defined(MSWIN32) || defined(MSWINCE) ptr_t _heap_bases[MAX_HEAP_SECTS]; /* Start address of memory regions obtained from kernel. */ # endif # ifdef MSWINCE word _heap_lengths[MAX_HEAP_SECTS]; /* Commited lengths of memory regions obtained from kernel. */ # endif struct roots _static_roots[MAX_ROOT_SETS]; # if !defined(MSWIN32) && !defined(MSWINCE) struct roots * _root_index[RT_SIZE]; # endif struct exclusion _excl_table[MAX_EXCLUSIONS]; /* Block header index; see gc_headers.h */ bottom_index * _all_nils; bottom_index * _top_index [TOP_SZ]; #ifdef SAVE_CALL_CHAIN struct callinfo _last_stack[NFRAMES]; /* Stack at last garbage collection.*/ /* Useful for debugging mysterious */ /* object disappearances. */ /* In the multithreaded case, we */ /* currently only save the calling */ /* stack. */ #endif }; GC_API GC_FAR struct _GC_arrays GC_arrays; # ifndef SEPARATE_GLOBALS # define GC_objfreelist GC_arrays._objfreelist # define GC_aobjfreelist GC_arrays._aobjfreelist # define GC_words_allocd GC_arrays._words_allocd # endif # define GC_uobjfreelist GC_arrays._uobjfreelist # ifdef ATOMIC_UNCOLLECTABLE # define GC_auobjfreelist GC_arrays._auobjfreelist # endif # define GC_sobjfreelist GC_arrays._sobjfreelist # define GC_valid_offsets GC_arrays._valid_offsets # define GC_modws_valid_offsets GC_arrays._modws_valid_offsets # ifdef STUBBORN_ALLOC # define GC_changed_pages GC_arrays._changed_pages # define GC_prev_changed_pages GC_arrays._prev_changed_pages # endif # define GC_obj_map GC_arrays._obj_map # define GC_last_heap_addr GC_arrays._last_heap_addr # define GC_prev_heap_addr GC_arrays._prev_heap_addr # define GC_words_wasted GC_arrays._words_wasted # define GC_large_free_bytes GC_arrays._large_free_bytes # define GC_large_allocd_bytes GC_arrays._large_allocd_bytes # define GC_max_large_allocd_bytes GC_arrays._max_large_allocd_bytes # define GC_words_finalized GC_arrays._words_finalized # define GC_non_gc_bytes_at_gc GC_arrays._non_gc_bytes_at_gc # define GC_mem_freed GC_arrays._mem_freed # define GC_scratch_end_ptr GC_arrays._scratch_end_ptr # define GC_scratch_last_end_ptr GC_arrays._scratch_last_end_ptr # define GC_mark_procs GC_arrays._mark_procs # define GC_heapsize GC_arrays._heapsize # define GC_max_heapsize GC_arrays._max_heapsize # define GC_requested_heapsize GC_arrays._requested_heapsize # define GC_words_allocd_before_gc GC_arrays._words_allocd_before_gc # define GC_heap_sects GC_arrays._heap_sects # define GC_last_stack GC_arrays._last_stack # ifdef USE_MUNMAP # define GC_unmapped_bytes GC_arrays._unmapped_bytes # endif # if defined(MSWIN32) || defined(MSWINCE) # define GC_heap_bases GC_arrays._heap_bases # endif # ifdef MSWINCE # define GC_heap_lengths GC_arrays._heap_lengths # endif # define GC_static_roots GC_arrays._static_roots # define GC_root_index GC_arrays._root_index # define GC_excl_table GC_arrays._excl_table # define GC_all_nils GC_arrays._all_nils # define GC_top_index GC_arrays._top_index # if defined(PROC_VDB) || defined(MPROTECT_VDB) # define GC_grungy_pages GC_arrays._grungy_pages # endif # ifdef MPROTECT_VDB # define GC_dirty_pages GC_arrays._dirty_pages # endif # ifdef PROC_VDB # define GC_written_pages GC_arrays._written_pages # endif # ifdef GATHERSTATS # define GC_composite_in_use GC_arrays._composite_in_use # define GC_atomic_in_use GC_arrays._atomic_in_use # endif # ifdef MERGE_SIZES # define GC_size_map GC_arrays._size_map # endif # define beginGC_arrays ((ptr_t)(&GC_arrays)) # define endGC_arrays (((ptr_t)(&GC_arrays)) + (sizeof GC_arrays)) #define USED_HEAP_SIZE (GC_heapsize - GC_large_free_bytes) /* Object kinds: */ # define MAXOBJKINDS 16 extern struct obj_kind { ptr_t *ok_freelist; /* Array of free listheaders for this kind of object */ /* Point either to GC_arrays or to storage allocated */ /* with GC_scratch_alloc. */ struct hblk **ok_reclaim_list; /* List headers for lists of blocks waiting to be */ /* swept. */ word ok_descriptor; /* Descriptor template for objects in this */ /* block. */ GC_bool ok_relocate_descr; /* Add object size in bytes to descriptor */ /* template to obtain descriptor. Otherwise */ /* template is used as is. */ GC_bool ok_init; /* Clear objects before putting them on the free list. */ } GC_obj_kinds[MAXOBJKINDS]; # define beginGC_obj_kinds ((ptr_t)(&GC_obj_kinds)) # define endGC_obj_kinds (beginGC_obj_kinds + (sizeof GC_obj_kinds)) /* Variables that used to be in GC_arrays, but need to be accessed by */ /* inline allocation code. If they were in GC_arrays, the inlined */ /* allocation code would include GC_arrays offsets (as it did), which */ /* introduce maintenance problems. */ #ifdef SEPARATE_GLOBALS word GC_words_allocd; /* Number of words allocated during this collection cycle */ ptr_t GC_objfreelist[MAXOBJSZ+1]; /* free list for NORMAL objects */ # define beginGC_objfreelist ((ptr_t)(&GC_objfreelist)) # define endGC_objfreelist (beginGC_objfreelist + sizeof(GC_objfreelist)) ptr_t GC_aobjfreelist[MAXOBJSZ+1]; /* free list for atomic (PTRFREE) objs */ # define beginGC_aobjfreelist ((ptr_t)(&GC_aobjfreelist)) # define endGC_aobjfreelist (beginGC_aobjfreelist + sizeof(GC_aobjfreelist)) #endif /* Predefined kinds: */ # define PTRFREE 0 # define NORMAL 1 # define UNCOLLECTABLE 2 # ifdef ATOMIC_UNCOLLECTABLE # define AUNCOLLECTABLE 3 # define STUBBORN 4 # define IS_UNCOLLECTABLE(k) (((k) & ~1) == UNCOLLECTABLE) # else # define STUBBORN 3 # define IS_UNCOLLECTABLE(k) ((k) == UNCOLLECTABLE) # endif extern int GC_n_kinds; GC_API word GC_fo_entries; extern word GC_n_heap_sects; /* Number of separately added heap */ /* sections. */ extern word GC_page_size; # if defined(MSWIN32) || defined(MSWINCE) struct _SYSTEM_INFO; extern struct _SYSTEM_INFO GC_sysinfo; extern word GC_n_heap_bases; /* See GC_heap_bases. */ # endif extern word GC_total_stack_black_listed; /* Number of bytes on stack blacklist. */ extern word GC_black_list_spacing; /* Average number of bytes between blacklisted */ /* blocks. Approximate. */ /* Counts only blocks that are */ /* "stack-blacklisted", i.e. that are */ /* problematic in the interior of an object. */ extern map_entry_type * GC_invalid_map; /* Pointer to the nowhere valid hblk map */ /* Blocks pointing to this map are free. */ extern struct hblk * GC_hblkfreelist[]; /* List of completely empty heap blocks */ /* Linked through hb_next field of */ /* header structure associated with */ /* block. */ extern GC_bool GC_is_initialized; /* GC_init() has been run. */ extern GC_bool GC_objects_are_marked; /* There are marked objects in */ /* the heap. */ #ifndef SMALL_CONFIG extern GC_bool GC_incremental; /* Using incremental/generational collection. */ #else # define GC_incremental FALSE /* Hopefully allow optimizer to remove some code. */ #endif extern GC_bool GC_dirty_maintained; /* Dirty bits are being maintained, */ /* either for incremental collection, */ /* or to limit the root set. */ extern word GC_root_size; /* Total size of registered root sections */ extern GC_bool GC_debugging_started; /* GC_debug_malloc has been called. */ /* Operations */ # ifndef abs # define abs(x) ((x) < 0? (-(x)) : (x)) # endif /* Marks are in a reserved area in */ /* each heap block. Each word has one mark bit associated */ /* with it. Only those corresponding to the beginning of an */ /* object are used. */ /* Set mark bit correctly, even if mark bits may be concurrently */ /* accessed. */ #ifdef PARALLEL_MARK # define OR_WORD(addr, bits) \ { word old; \ do { \ old = *((volatile word *)addr); \ } while (!GC_compare_and_exchange((addr), old, old | (bits))); \ } # define OR_WORD_EXIT_IF_SET(addr, bits, exit_label) \ { word old; \ word my_bits = (bits); \ do { \ old = *((volatile word *)addr); \ if (old & my_bits) goto exit_label; \ } while (!GC_compare_and_exchange((addr), old, old | my_bits)); \ } #else # define OR_WORD(addr, bits) *(addr) |= (bits) # define OR_WORD_EXIT_IF_SET(addr, bits, exit_label) \ { \ word old = *(addr); \ word my_bits = (bits); \ if (old & my_bits) goto exit_label; \ *(addr) = (old | my_bits); \ } #endif /* Mark bit operations */ /* * Retrieve, set, clear the mark bit corresponding * to the nth word in a given heap block. * * (Recall that bit n corresponds to object beginning at word n * relative to the beginning of the block, including unused words) */ #ifdef USE_MARK_BYTES # define mark_bit_from_hdr(hhdr,n) ((hhdr)->hb_marks[(n) >> 1]) # define set_mark_bit_from_hdr(hhdr,n) ((hhdr)->hb_marks[(n)>>1]) = 1 # define clear_mark_bit_from_hdr(hhdr,n) ((hhdr)->hb_marks[(n)>>1]) = 0 #else /* !USE_MARK_BYTES */ # define mark_bit_from_hdr(hhdr,n) (((hhdr)->hb_marks[divWORDSZ(n)] \ >> (modWORDSZ(n))) & (word)1) # define set_mark_bit_from_hdr(hhdr,n) \ OR_WORD((hhdr)->hb_marks+divWORDSZ(n), \ (word)1 << modWORDSZ(n)) # define clear_mark_bit_from_hdr(hhdr,n) (hhdr)->hb_marks[divWORDSZ(n)] \ &= ~((word)1 << modWORDSZ(n)) #endif /* !USE_MARK_BYTES */ /* Important internal collector routines */ ptr_t GC_approx_sp GC_PROTO((void)); GC_bool GC_should_collect GC_PROTO((void)); void GC_apply_to_all_blocks GC_PROTO(( \ void (*fn) GC_PROTO((struct hblk *h, word client_data)), \ word client_data)); /* Invoke fn(hbp, client_data) for each */ /* allocated heap block. */ struct hblk * GC_next_used_block GC_PROTO((struct hblk * h)); /* Return first in-use block >= h */ struct hblk * GC_prev_block GC_PROTO((struct hblk * h)); /* Return last block <= h. Returned block */ /* is managed by GC, but may or may not be in */ /* use. */ void GC_mark_init GC_PROTO((void)); void GC_clear_marks GC_PROTO((void)); /* Clear mark bits for all heap objects. */ void GC_invalidate_mark_state GC_PROTO((void)); /* Tell the marker that marked */ /* objects may point to unmarked */ /* ones, and roots may point to */ /* unmarked objects. */ /* Reset mark stack. */ GC_bool GC_mark_stack_empty GC_PROTO((void)); GC_bool GC_mark_some GC_PROTO((ptr_t cold_gc_frame)); /* Perform about one pages worth of marking */ /* work of whatever kind is needed. Returns */ /* quickly if no collection is in progress. */ /* Return TRUE if mark phase finished. */ void GC_initiate_gc GC_PROTO((void)); /* initiate collection. */ /* If the mark state is invalid, this */ /* becomes full colleection. Otherwise */ /* it's partial. */ void GC_push_all GC_PROTO((ptr_t bottom, ptr_t top)); /* Push everything in a range */ /* onto mark stack. */ void GC_push_selected GC_PROTO(( \ ptr_t bottom, \ ptr_t top, \ int (*dirty_fn) GC_PROTO((struct hblk *h)), \ void (*push_fn) GC_PROTO((ptr_t bottom, ptr_t top)) )); /* Push all pages h in [b,t) s.t. */ /* select_fn(h) != 0 onto mark stack. */ #ifndef SMALL_CONFIG void GC_push_conditional GC_PROTO((ptr_t b, ptr_t t, GC_bool all)); #else # define GC_push_conditional(b, t, all) GC_push_all(b, t) #endif /* Do either of the above, depending */ /* on the third arg. */ void GC_push_all_stack GC_PROTO((ptr_t b, ptr_t t)); /* As above, but consider */ /* interior pointers as valid */ void GC_push_all_eager GC_PROTO((ptr_t b, ptr_t t)); /* Same as GC_push_all_stack, but */ /* ensures that stack is scanned */ /* immediately, not just scheduled */ /* for scanning. */ #ifndef THREADS void GC_push_all_stack_partially_eager GC_PROTO(( \ ptr_t bottom, ptr_t top, ptr_t cold_gc_frame )); /* Similar to GC_push_all_eager, but only the */ /* part hotter than cold_gc_frame is scanned */ /* immediately. Needed to ensure that callee- */ /* save registers are not missed. */ #else /* In the threads case, we push part of the current thread stack */ /* with GC_push_all_eager when we push the registers. This gets the */ /* callee-save registers that may disappear. The remainder of the */ /* stacks are scheduled for scanning in *GC_push_other_roots, which */ /* is thread-package-specific. */ #endif void GC_push_current_stack GC_PROTO((ptr_t cold_gc_frame)); /* Push enough of the current stack eagerly to */ /* ensure that callee-save registers saved in */ /* GC frames are scanned. */ /* In the non-threads case, schedule entire */ /* stack for scanning. */ void GC_push_roots GC_PROTO((GC_bool all, ptr_t cold_gc_frame)); /* Push all or dirty roots. */ extern void (*GC_push_other_roots) GC_PROTO((void)); /* Push system or application specific roots */ /* onto the mark stack. In some environments */ /* (e.g. threads environments) this is */ /* predfined to be non-zero. A client supplied */ /* replacement should also call the original */ /* function. */ extern void GC_push_gc_structures GC_PROTO((void)); /* Push GC internal roots. These are normally */ /* included in the static data segment, and */ /* Thus implicitly pushed. But we must do this */ /* explicitly if normal root processing is */ /* disabled. Calls the following: */ extern void GC_push_finalizer_structures GC_PROTO((void)); extern void GC_push_stubborn_structures GC_PROTO((void)); # ifdef THREADS extern void GC_push_thread_structures GC_PROTO((void)); # endif extern void (*GC_start_call_back) GC_PROTO((void)); /* Called at start of full collections. */ /* Not called if 0. Called with allocation */ /* lock held. */ /* 0 by default. */ # if defined(USE_GENERIC_PUSH_REGS) void GC_generic_push_regs GC_PROTO((ptr_t cold_gc_frame)); # else void GC_push_regs GC_PROTO((void)); # endif /* Push register contents onto mark stack. */ /* If NURSERY is defined, the default push */ /* action can be overridden with GC_push_proc */ # ifdef NURSERY extern void (*GC_push_proc)(ptr_t); # endif # if defined(MSWIN32) || defined(MSWINCE) void __cdecl GC_push_one GC_PROTO((word p)); # else void GC_push_one GC_PROTO((word p)); /* If p points to an object, mark it */ /* and push contents on the mark stack */ /* Pointer recognition test always */ /* accepts interior pointers, i.e. this */ /* is appropriate for pointers found on */ /* stack. */ # endif # if defined(PRINT_BLACK_LIST) || defined(KEEP_BACK_PTRS) void GC_mark_and_push_stack GC_PROTO((word p, ptr_t source)); /* Ditto, omits plausibility test */ # else void GC_mark_and_push_stack GC_PROTO((word p)); # endif void GC_push_marked GC_PROTO((struct hblk * h, hdr * hhdr)); /* Push contents of all marked objects in h onto */ /* mark stack. */ #ifdef SMALL_CONFIG # define GC_push_next_marked_dirty(h) GC_push_next_marked(h) #else struct hblk * GC_push_next_marked_dirty GC_PROTO((struct hblk * h)); /* Invoke GC_push_marked on next dirty block above h. */ /* Return a pointer just past the end of this block. */ #endif /* !SMALL_CONFIG */ struct hblk * GC_push_next_marked GC_PROTO((struct hblk * h)); /* Ditto, but also mark from clean pages. */ struct hblk * GC_push_next_marked_uncollectable GC_PROTO((struct hblk * h)); /* Ditto, but mark only from uncollectable pages. */ GC_bool GC_stopped_mark GC_PROTO((GC_stop_func stop_func)); /* Stop world and mark from all roots */ /* and rescuers. */ void GC_clear_hdr_marks GC_PROTO((hdr * hhdr)); /* Clear the mark bits in a header */ void GC_set_hdr_marks GC_PROTO((hdr * hhdr)); /* Set the mark bits in a header */ void GC_set_fl_marks GC_PROTO((ptr_t p)); /* Set all mark bits associated with */ /* a free list. */ void GC_add_roots_inner GC_PROTO((char * b, char * e, GC_bool tmp)); GC_bool GC_is_static_root GC_PROTO((ptr_t p)); /* Is the address p in one of the registered static */ /* root sections? */ # if defined(MSWIN32) || defined(_WIN32_WCE_EMULATION) GC_bool GC_is_tmp_root GC_PROTO((ptr_t p)); /* Is the address p in one of the temporary static */ /* root sections? */ # endif void GC_register_dynamic_libraries GC_PROTO((void)); /* Add dynamic library data sections to the root set. */ /* Machine dependent startup routines */ ptr_t GC_get_stack_base GC_PROTO((void)); /* Cold end of stack */ #ifdef IA64 ptr_t GC_get_register_stack_base GC_PROTO((void)); /* Cold end of register stack. */ #endif void GC_register_data_segments GC_PROTO((void)); /* Black listing: */ void GC_bl_init GC_PROTO((void)); # ifdef PRINT_BLACK_LIST void GC_add_to_black_list_normal GC_PROTO((word p, ptr_t source)); /* Register bits as a possible future false */ /* reference from the heap or static data */ # define GC_ADD_TO_BLACK_LIST_NORMAL(bits, source) \ if (GC_all_interior_pointers) { \ GC_add_to_black_list_stack(bits, (ptr_t)(source)); \ } else { \ GC_add_to_black_list_normal(bits, (ptr_t)(source)); \ } # else void GC_add_to_black_list_normal GC_PROTO((word p)); # define GC_ADD_TO_BLACK_LIST_NORMAL(bits, source) \ if (GC_all_interior_pointers) { \ GC_add_to_black_list_stack(bits); \ } else { \ GC_add_to_black_list_normal(bits); \ } # endif # ifdef PRINT_BLACK_LIST void GC_add_to_black_list_stack GC_PROTO((word p, ptr_t source)); # else void GC_add_to_black_list_stack GC_PROTO((word p)); # endif struct hblk * GC_is_black_listed GC_PROTO((struct hblk * h, word len)); /* If there are likely to be false references */ /* to a block starting at h of the indicated */ /* length, then return the next plausible */ /* starting location for h that might avoid */ /* these false references. */ void GC_promote_black_lists GC_PROTO((void)); /* Declare an end to a black listing phase. */ void GC_unpromote_black_lists GC_PROTO((void)); /* Approximately undo the effect of the above. */ /* This actually loses some information, but */ /* only in a reasonably safe way. */ word GC_number_stack_black_listed GC_PROTO(( \ struct hblk *start, struct hblk *endp1)); /* Return the number of (stack) blacklisted */ /* blocks in the range for statistical */ /* purposes. */ ptr_t GC_scratch_alloc GC_PROTO((word bytes)); /* GC internal memory allocation for */ /* small objects. Deallocation is not */ /* possible. */ /* Heap block layout maps: */ void GC_invalidate_map GC_PROTO((hdr * hhdr)); /* Remove the object map associated */ /* with the block. This identifies */ /* the block as invalid to the mark */ /* routines. */ GC_bool GC_add_map_entry GC_PROTO((word sz)); /* Add a heap block map for objects of */ /* size sz to obj_map. */ /* Return FALSE on failure. */ void GC_register_displacement_inner GC_PROTO((word offset)); /* Version of GC_register_displacement */ /* that assumes lock is already held */ /* and signals are already disabled. */ /* hblk allocation: */ void GC_new_hblk GC_PROTO((word size_in_words, int kind)); /* Allocate a new heap block, and build */ /* a free list in it. */ ptr_t GC_build_fl GC_PROTO((struct hblk *h, word sz, GC_bool clear, ptr_t list)); /* Build a free list for objects of */ /* size sz in block h. Append list to */ /* end of the free lists. Possibly */ /* clear objects on the list. Normally */ /* called by GC_new_hblk, but also */ /* called explicitly without GC lock. */ struct hblk * GC_allochblk GC_PROTO(( \ word size_in_words, int kind, unsigned flags)); /* Allocate a heap block, inform */ /* the marker that block is valid */ /* for objects of indicated size. */ ptr_t GC_alloc_large GC_PROTO((word lw, int k, unsigned flags)); /* Allocate a large block of size lw words. */ /* The block is not cleared. */ /* Flags is 0 or IGNORE_OFF_PAGE. */ /* Calls GC_allchblk to do the actual */ /* allocation, but also triggers GC and/or */ /* heap expansion as appropriate. */ /* Does not update GC_words_allocd, but does */ /* other accounting. */ ptr_t GC_alloc_large_and_clear GC_PROTO((word lw, int k, unsigned flags)); /* As above, but clear block if appropriate */ /* for kind k. */ void GC_freehblk GC_PROTO((struct hblk * p)); /* Deallocate a heap block and mark it */ /* as invalid. */ /* Misc GC: */ void GC_init_inner GC_PROTO((void)); GC_bool GC_expand_hp_inner GC_PROTO((word n)); void GC_start_reclaim GC_PROTO((int abort_if_found)); /* Restore unmarked objects to free */ /* lists, or (if abort_if_found is */ /* TRUE) report them. */ /* Sweeping of small object pages is */ /* largely deferred. */ void GC_continue_reclaim GC_PROTO((word sz, int kind)); /* Sweep pages of the given size and */ /* kind, as long as possible, and */ /* as long as the corr. free list is */ /* empty. */ void GC_reclaim_or_delete_all GC_PROTO((void)); /* Arrange for all reclaim lists to be */ /* empty. Judiciously choose between */ /* sweeping and discarding each page. */ GC_bool GC_reclaim_all GC_PROTO((GC_stop_func stop_func, GC_bool ignore_old)); /* Reclaim all blocks. Abort (in a */ /* consistent state) if f returns TRUE. */ GC_bool GC_block_empty GC_PROTO((hdr * hhdr)); /* Block completely unmarked? */ GC_bool GC_never_stop_func GC_PROTO((void)); /* Returns FALSE. */ GC_bool GC_try_to_collect_inner GC_PROTO((GC_stop_func f)); /* Collect; caller must have acquired */ /* lock and disabled signals. */ /* Collection is aborted if f returns */ /* TRUE. Returns TRUE if it completes */ /* successfully. */ # define GC_gcollect_inner() \ (void) GC_try_to_collect_inner(GC_never_stop_func) void GC_finish_collection GC_PROTO((void)); /* Finish collection. Mark bits are */ /* consistent and lock is still held. */ GC_bool GC_collect_or_expand GC_PROTO(( \ word needed_blocks, GC_bool ignore_off_page)); /* Collect or expand heap in an attempt */ /* make the indicated number of free */ /* blocks available. Should be called */ /* until the blocks are available or */ /* until it fails by returning FALSE. */ #if defined(MSWIN32) || defined(MSWINCE) void GC_deinit GC_PROTO((void)); /* Free any resources allocated by */ /* GC_init */ #endif void GC_collect_a_little_inner GC_PROTO((int n)); /* Do n units worth of garbage */ /* collection work, if appropriate. */ /* A unit is an amount appropriate for */ /* HBLKSIZE bytes of allocation. */ ptr_t GC_generic_malloc GC_PROTO((word lb, int k)); /* Allocate an object of the given */ /* kind. By default, there are only */ /* a few kinds: composite(pointerfree), */ /* atomic, uncollectable, etc. */ /* We claim it's possible for clever */ /* client code that understands GC */ /* internals to add more, e.g. to */ /* communicate object layout info */ /* to the collector. */ ptr_t GC_generic_malloc_ignore_off_page GC_PROTO((size_t b, int k)); /* As above, but pointers past the */ /* first page of the resulting object */ /* are ignored. */ ptr_t GC_generic_malloc_inner GC_PROTO((word lb, int k)); /* Ditto, but I already hold lock, etc. */ ptr_t GC_generic_malloc_words_small GC_PROTO((size_t lw, int k)); /* As above, but size in units of words */ /* Bypasses MERGE_SIZES. Assumes */ /* words <= MAXOBJSZ. */ ptr_t GC_generic_malloc_inner_ignore_off_page GC_PROTO((size_t lb, int k)); /* Allocate an object, where */ /* the client guarantees that there */ /* will always be a pointer to the */ /* beginning of the object while the */ /* object is live. */ ptr_t GC_allocobj GC_PROTO((word sz, int kind)); /* Make the indicated */ /* free list nonempty, and return its */ /* head. */ void GC_init_headers GC_PROTO((void)); struct hblkhdr * GC_install_header GC_PROTO((struct hblk *h)); /* Install a header for block h. */ /* Return 0 on failure, or the header */ /* otherwise. */ GC_bool GC_install_counts GC_PROTO((struct hblk * h, word sz)); /* Set up forwarding counts for block */ /* h of size sz. */ /* Return FALSE on failure. */ void GC_remove_header GC_PROTO((struct hblk * h)); /* Remove the header for block h. */ void GC_remove_counts GC_PROTO((struct hblk * h, word sz)); /* Remove forwarding counts for h. */ hdr * GC_find_header GC_PROTO((ptr_t h)); /* Debugging only. */ void GC_finalize GC_PROTO((void)); /* Perform all indicated finalization actions */ /* on unmarked objects. */ /* Unreachable finalizable objects are enqueued */ /* for processing by GC_invoke_finalizers. */ /* Invoked with lock. */ void GC_notify_or_invoke_finalizers GC_PROTO((void)); /* If GC_finalize_on_demand is not set, invoke */ /* eligible finalizers. Otherwise: */ /* Call *GC_finalizer_notifier if there are */ /* finalizers to be run, and we haven't called */ /* this procedure yet this GC cycle. */ void GC_add_to_heap GC_PROTO((struct hblk *p, word bytes)); /* Add a HBLKSIZE aligned chunk to the heap. */ void GC_print_obj GC_PROTO((ptr_t p)); /* P points to somewhere inside an object with */ /* debugging info. Print a human readable */ /* description of the object to stderr. */ extern void (*GC_check_heap) GC_PROTO((void)); /* Check that all objects in the heap with */ /* debugging info are intact. Print */ /* descriptions of any that are not. */ extern void (*GC_print_heap_obj) GC_PROTO((ptr_t p)); /* If possible print s followed by a more */ /* detailed description of the object */ /* referred to by p. */ extern GC_bool GC_print_stats; /* Produce at least some logging output */ /* Set from environment variable. */ /* Macros used for collector internal allocation. */ /* These assume the collector lock is held. */ #ifdef DBG_HDRS_ALL extern GC_PTR GC_debug_generic_malloc_inner(size_t lb, int k); extern GC_PTR GC_debug_generic_malloc_inner_ignore_off_page(size_t lb, int k); # define GC_INTERNAL_MALLOC GC_debug_generic_malloc_inner # define GC_INTERNAL_MALLOC_IGNORE_OFF_PAGE \ GC_debug_generic_malloc_inner_ignore_off_page # ifdef THREADS # define GC_INTERNAL_FREE GC_debug_free_inner # else # define GC_INTERNAL_FREE GC_debug_free # endif #else # define GC_INTERNAL_MALLOC GC_generic_malloc_inner # define GC_INTERNAL_MALLOC_IGNORE_OFF_PAGE \ GC_generic_malloc_inner_ignore_off_page # ifdef THREADS # define GC_INTERNAL_FREE GC_free_inner # else # define GC_INTERNAL_FREE GC_free # endif #endif /* Memory unmapping: */ #ifdef USE_MUNMAP void GC_unmap_old(void); void GC_merge_unmapped(void); void GC_unmap(ptr_t start, word bytes); void GC_remap(ptr_t start, word bytes); void GC_unmap_gap(ptr_t start1, word bytes1, ptr_t start2, word bytes2); #endif /* Virtual dirty bit implementation: */ /* Each implementation exports the following: */ void GC_read_dirty GC_PROTO((void)); /* Retrieve dirty bits. */ GC_bool GC_page_was_dirty GC_PROTO((struct hblk *h)); /* Read retrieved dirty bits. */ GC_bool GC_page_was_ever_dirty GC_PROTO((struct hblk *h)); /* Could the page contain valid heap pointers? */ void GC_is_fresh GC_PROTO((struct hblk *h, word n)); /* Assert the region currently contains no */ /* valid pointers. */ void GC_write_hint GC_PROTO((struct hblk *h)); /* h is about to be written. */ void GC_dirty_init GC_PROTO((void)); /* Slow/general mark bit manipulation: */ GC_API GC_bool GC_is_marked GC_PROTO((ptr_t p)); void GC_clear_mark_bit GC_PROTO((ptr_t p)); void GC_set_mark_bit GC_PROTO((ptr_t p)); /* Stubborn objects: */ void GC_read_changed GC_PROTO((void)); /* Analogous to GC_read_dirty */ GC_bool GC_page_was_changed GC_PROTO((struct hblk * h)); /* Analogous to GC_page_was_dirty */ void GC_clean_changing_list GC_PROTO((void)); /* Collect obsolete changing list entries */ void GC_stubborn_init GC_PROTO((void)); /* Debugging print routines: */ void GC_print_block_list GC_PROTO((void)); void GC_print_hblkfreelist GC_PROTO((void)); void GC_print_heap_sects GC_PROTO((void)); void GC_print_static_roots GC_PROTO((void)); void GC_dump GC_PROTO((void)); #ifdef KEEP_BACK_PTRS void GC_store_back_pointer(ptr_t source, ptr_t dest); void GC_marked_for_finalization(ptr_t dest); # define GC_STORE_BACK_PTR(source, dest) GC_store_back_pointer(source, dest) # define GC_MARKED_FOR_FINALIZATION(dest) GC_marked_for_finalization(dest) #else # define GC_STORE_BACK_PTR(source, dest) # define GC_MARKED_FOR_FINALIZATION(dest) #endif /* Make arguments appear live to compiler */ # ifdef __WATCOMC__ void GC_noop(void*, ...); # else # ifdef __DMC__ GC_API void GC_noop(...); # else GC_API void GC_noop(); # endif # endif void GC_noop1 GC_PROTO((word)); /* Logging and diagnostic output: */ GC_API void GC_printf GC_PROTO((GC_CONST char * format, long, long, long, long, long, long)); /* A version of printf that doesn't allocate, */ /* is restricted to long arguments, and */ /* (unfortunately) doesn't use varargs for */ /* portability. Restricted to 6 args and */ /* 1K total output length. */ /* (We use sprintf. Hopefully that doesn't */ /* allocate for long arguments.) */ # define GC_printf0(f) GC_printf(f, 0l, 0l, 0l, 0l, 0l, 0l) # define GC_printf1(f,a) GC_printf(f, (long)a, 0l, 0l, 0l, 0l, 0l) # define GC_printf2(f,a,b) GC_printf(f, (long)a, (long)b, 0l, 0l, 0l, 0l) # define GC_printf3(f,a,b,c) GC_printf(f, (long)a, (long)b, (long)c, 0l, 0l, 0l) # define GC_printf4(f,a,b,c,d) GC_printf(f, (long)a, (long)b, (long)c, \ (long)d, 0l, 0l) # define GC_printf5(f,a,b,c,d,e) GC_printf(f, (long)a, (long)b, (long)c, \ (long)d, (long)e, 0l) # define GC_printf6(f,a,b,c,d,e,g) GC_printf(f, (long)a, (long)b, (long)c, \ (long)d, (long)e, (long)g) GC_API void GC_err_printf GC_PROTO((GC_CONST char * format, long, long, long, long, long, long)); # define GC_err_printf0(f) GC_err_puts(f) # define GC_err_printf1(f,a) GC_err_printf(f, (long)a, 0l, 0l, 0l, 0l, 0l) # define GC_err_printf2(f,a,b) GC_err_printf(f, (long)a, (long)b, 0l, 0l, 0l, 0l) # define GC_err_printf3(f,a,b,c) GC_err_printf(f, (long)a, (long)b, (long)c, \ 0l, 0l, 0l) # define GC_err_printf4(f,a,b,c,d) GC_err_printf(f, (long)a, (long)b, \ (long)c, (long)d, 0l, 0l) # define GC_err_printf5(f,a,b,c,d,e) GC_err_printf(f, (long)a, (long)b, \ (long)c, (long)d, \ (long)e, 0l) # define GC_err_printf6(f,a,b,c,d,e,g) GC_err_printf(f, (long)a, (long)b, \ (long)c, (long)d, \ (long)e, (long)g) /* Ditto, writes to stderr. */ void GC_err_puts GC_PROTO((GC_CONST char *s)); /* Write s to stderr, don't buffer, don't add */ /* newlines, don't ... */ #if defined(LINUX) && !defined(SMALL_CONFIG) void GC_err_write GC_PROTO((GC_CONST char *buf, size_t len)); /* Write buf to stderr, don't buffer, don't add */ /* newlines, don't ... */ #endif # ifdef GC_ASSERTIONS # define GC_ASSERT(expr) if(!(expr)) {\ GC_err_printf2("Assertion failure: %s:%ld\n", \ __FILE__, (unsigned long)__LINE__); \ ABORT("assertion failure"); } # else # define GC_ASSERT(expr) # endif # if defined(PARALLEL_MARK) || defined(THREAD_LOCAL_ALLOC) /* We need additional synchronization facilities from the thread */ /* support. We believe these are less performance critical */ /* than the main garbage collector lock; standard pthreads-based */ /* implementations should be sufficient. */ /* The mark lock and condition variable. If the GC lock is also */ /* acquired, the GC lock must be acquired first. The mark lock is */ /* used to both protect some variables used by the parallel */ /* marker, and to protect GC_fl_builder_count, below. */ /* GC_notify_all_marker() is called when */ /* the state of the parallel marker changes */ /* in some significant way (see gc_mark.h for details). The */ /* latter set of events includes incrementing GC_mark_no. */ /* GC_notify_all_builder() is called when GC_fl_builder_count */ /* reaches 0. */ extern void GC_acquire_mark_lock(); extern void GC_release_mark_lock(); extern void GC_notify_all_builder(); /* extern void GC_wait_builder(); */ extern void GC_wait_for_reclaim(); extern word GC_fl_builder_count; /* Protected by mark lock. */ # endif /* PARALLEL_MARK || THREAD_LOCAL_ALLOC */ # ifdef PARALLEL_MARK extern void GC_notify_all_marker(); extern void GC_wait_marker(); extern word GC_mark_no; /* Protected by mark lock. */ extern void GC_help_marker(word my_mark_no); /* Try to help out parallel marker for mark cycle */ /* my_mark_no. Returns if the mark cycle finishes or */ /* was already done, or there was nothing to do for */ /* some other reason. */ # endif /* PARALLEL_MARK */ # if defined(GC_PTHREADS) && !defined(GC_SOLARIS_THREADS) /* We define the thread suspension signal here, so that we can refer */ /* to it in the dirty bit implementation, if necessary. Ideally we */ /* would allocate a (real-time ?) signal using the standard mechanism.*/ /* unfortunately, there is no standard mechanism. (There is one */ /* in Linux glibc, but it's not exported.) Thus we continue to use */ /* the same hard-coded signals we've always used. */ # if !defined(SIG_SUSPEND) # if defined(GC_LINUX_THREADS) # if defined(SPARC) && !defined(SIGPWR) /* SPARC/Linux doesn't properly define SIGPWR in . * It is aliased to SIGLOST in asm/signal.h, though. */ # define SIG_SUSPEND SIGLOST # else /* Linuxthreads itself uses SIGUSR1 and SIGUSR2. */ # define SIG_SUSPEND SIGPWR # endif # else /* !GC_LINUX_THREADS */ # define SIG_SUSPEND _SIGRTMIN + 6 # endif # endif /* !SIG_SUSPEND */ # endif # endif /* GC_PRIVATE_H */