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Diffstat (limited to 'boehm_gc/misc.c')
| -rw-r--r-- | boehm_gc/misc.c | 1177 |
1 files changed, 1177 insertions, 0 deletions
diff --git a/boehm_gc/misc.c b/boehm_gc/misc.c new file mode 100644 index 0000000..37e5093 --- /dev/null +++ b/boehm_gc/misc.c @@ -0,0 +1,1177 @@ +/* + * Copyright 1988, 1989 Hans-J. Boehm, Alan J. Demers + * Copyright (c) 1991-1994 by Xerox Corporation. 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. + */ +/* Boehm, July 31, 1995 5:02 pm PDT */ + + +#include <stdio.h> +#include <limits.h> +#include <stdarg.h> +#ifndef _WIN32_WCE +#include <signal.h> +#endif + +#define I_HIDE_POINTERS /* To make GC_call_with_alloc_lock visible */ +#include "private/gc_pmark.h" + +#ifdef GC_SOLARIS_THREADS +# include <sys/syscall.h> +#endif +#if defined(MSWIN32) || defined(MSWINCE) +# define WIN32_LEAN_AND_MEAN +# define NOSERVICE +# include <windows.h> +# include <tchar.h> +#endif + +#ifdef UNIX_LIKE +# include <fcntl.h> +# include <sys/types.h> +# include <sys/stat.h> + + int GC_log; /* Forward decl, so we can set it. */ +#endif + +#ifdef NONSTOP +# include <floss.h> +#endif + +#if defined(THREADS) && defined(PCR) +# include "il/PCR_IL.h" + PCR_Th_ML GC_allocate_ml; +#endif +/* For other platforms with threads, the lock and possibly */ +/* GC_lock_holder variables are defined in the thread support code. */ + +#if defined(NOSYS) || defined(ECOS) +#undef STACKBASE +#endif + +/* Dont unnecessarily call GC_register_main_static_data() in case */ +/* dyn_load.c isn't linked in. */ +#ifdef DYNAMIC_LOADING +# define GC_REGISTER_MAIN_STATIC_DATA() GC_register_main_static_data() +#else +# define GC_REGISTER_MAIN_STATIC_DATA() TRUE +#endif + +GC_FAR struct _GC_arrays GC_arrays /* = { 0 } */; + + +GC_bool GC_debugging_started = FALSE; + /* defined here so we don't have to load debug_malloc.o */ + +void (*GC_check_heap) (void) = (void (*) (void))0; +void (*GC_print_all_smashed) (void) = (void (*) (void))0; + +void (*GC_start_call_back) (void) = (void (*) (void))0; + +ptr_t GC_stackbottom = 0; + +#ifdef IA64 + ptr_t GC_register_stackbottom = 0; +#endif + +GC_bool GC_dont_gc = 0; + +GC_bool GC_dont_precollect = 0; + +GC_bool GC_quiet = 0; + +#ifndef SMALL_CONFIG + GC_bool GC_print_stats = 0; +#endif + +GC_bool GC_print_back_height = 0; + +#ifndef NO_DEBUGGING + GC_bool GC_dump_regularly = 0; /* Generate regular debugging dumps. */ +#endif + +#ifdef KEEP_BACK_PTRS + long GC_backtraces = 0; /* Number of random backtraces to */ + /* generate for each GC. */ +#endif + +#ifdef FIND_LEAK + int GC_find_leak = 1; +#else + int GC_find_leak = 0; +#endif + +#ifdef ALL_INTERIOR_POINTERS + int GC_all_interior_pointers = 1; +#else + int GC_all_interior_pointers = 0; +#endif + +long GC_large_alloc_warn_interval = 5; + /* Interval between unsuppressed warnings. */ + +long GC_large_alloc_warn_suppressed = 0; + /* Number of warnings suppressed so far. */ + +/*ARGSUSED*/ +void * GC_default_oom_fn(size_t bytes_requested) +{ + return(0); +} + +void * (*GC_oom_fn) (size_t bytes_requested) = GC_default_oom_fn; + +void * GC_project2(void *arg1, void *arg2) +{ + return arg2; +} + +/* Set things up so that GC_size_map[i] >= granules(i), */ +/* but not too much bigger */ +/* and so that size_map contains relatively few distinct entries */ +/* This was originally stolen from Russ Atkinson's Cedar */ +/* quantization alogrithm (but we precompute it). */ +void GC_init_size_map(void) +{ + int i; + + /* Map size 0 to something bigger. */ + /* This avoids problems at lower levels. */ + GC_size_map[0] = 1; + for (i = 1; i <= GRANULES_TO_BYTES(TINY_FREELISTS-1) - EXTRA_BYTES; i++) { + GC_size_map[i] = ROUNDED_UP_GRANULES(i); + GC_ASSERT(GC_size_map[i] < TINY_FREELISTS); + } + /* We leave the rest of the array to be filled in on demand. */ +} + +/* Fill in additional entries in GC_size_map, including the ith one */ +/* We assume the ith entry is currently 0. */ +/* Note that a filled in section of the array ending at n always */ +/* has length at least n/4. */ +void GC_extend_size_map(size_t i) +{ + size_t orig_granule_sz = ROUNDED_UP_GRANULES(i); + size_t granule_sz = orig_granule_sz; + size_t byte_sz = GRANULES_TO_BYTES(granule_sz); + /* The size we try to preserve. */ + /* Close to i, unless this would */ + /* introduce too many distinct sizes. */ + size_t smaller_than_i = byte_sz - (byte_sz >> 3); + size_t much_smaller_than_i = byte_sz - (byte_sz >> 2); + size_t low_limit; /* The lowest indexed entry we */ + /* initialize. */ + size_t j; + + if (GC_size_map[smaller_than_i] == 0) { + low_limit = much_smaller_than_i; + while (GC_size_map[low_limit] != 0) low_limit++; + } else { + low_limit = smaller_than_i + 1; + while (GC_size_map[low_limit] != 0) low_limit++; + granule_sz = ROUNDED_UP_GRANULES(low_limit); + granule_sz += granule_sz >> 3; + if (granule_sz < orig_granule_sz) granule_sz = orig_granule_sz; + } + /* For these larger sizes, we use an even number of granules. */ + /* This makes it easier to, for example, construct a 16byte-aligned */ + /* allocator even if GRANULE_BYTES is 8. */ + granule_sz += 1; + granule_sz &= ~1; + if (granule_sz > MAXOBJGRANULES) { + granule_sz = MAXOBJGRANULES; + } + /* If we can fit the same number of larger objects in a block, */ + /* do so. */ + { + size_t number_of_objs = HBLK_GRANULES/granule_sz; + granule_sz = HBLK_GRANULES/number_of_objs; + granule_sz &= ~1; + } + byte_sz = GRANULES_TO_BYTES(granule_sz); + /* We may need one extra byte; */ + /* don't always fill in GC_size_map[byte_sz] */ + byte_sz -= EXTRA_BYTES; + + for (j = low_limit; j <= byte_sz; j++) GC_size_map[j] = granule_sz; +} + + +/* + * The following is a gross hack to deal with a problem that can occur + * on machines that are sloppy about stack frame sizes, notably SPARC. + * Bogus pointers may be written to the stack and not cleared for + * a LONG time, because they always fall into holes in stack frames + * that are not written. We partially address this by clearing + * sections of the stack whenever we get control. + */ +word GC_stack_last_cleared = 0; /* GC_no when we last did this */ +# ifdef THREADS +# define BIG_CLEAR_SIZE 2048 /* Clear this much now and then. */ +# define SMALL_CLEAR_SIZE 256 /* Clear this much every time. */ +# endif +# define CLEAR_SIZE 213 /* Granularity for GC_clear_stack_inner */ +# define DEGRADE_RATE 50 + +ptr_t GC_min_sp; /* Coolest stack pointer value from which we've */ + /* already cleared the stack. */ + +ptr_t GC_high_water; + /* "hottest" stack pointer value we have seen */ + /* recently. Degrades over time. */ + +word GC_bytes_allocd_at_reset; + +#if defined(ASM_CLEAR_CODE) + extern void *GC_clear_stack_inner(void *, ptr_t); +#else +/* Clear the stack up to about limit. Return arg. */ +/*ARGSUSED*/ +void * GC_clear_stack_inner(void *arg, ptr_t limit) +{ + word dummy[CLEAR_SIZE]; + + BZERO(dummy, CLEAR_SIZE*sizeof(word)); + if ((ptr_t)(dummy) COOLER_THAN limit) { + (void) GC_clear_stack_inner(arg, limit); + } + /* Make sure the recursive call is not a tail call, and the bzero */ + /* call is not recognized as dead code. */ + GC_noop1((word)dummy); + return(arg); +} +#endif + +/* Clear some of the inaccessible part of the stack. Returns its */ +/* argument, so it can be used in a tail call position, hence clearing */ +/* another frame. */ +void * GC_clear_stack(void *arg) +{ + ptr_t sp = GC_approx_sp(); /* Hotter than actual sp */ +# ifdef THREADS + word dummy[SMALL_CLEAR_SIZE]; + static unsigned random_no = 0; + /* Should be more random than it is ... */ + /* Used to occasionally clear a bigger */ + /* chunk. */ +# endif + ptr_t limit; + +# define SLOP 400 + /* Extra bytes we clear every time. This clears our own */ + /* activation record, and should cause more frequent */ + /* clearing near the cold end of the stack, a good thing. */ +# define GC_SLOP 4000 + /* We make GC_high_water this much hotter than we really saw */ + /* saw it, to cover for GC noise etc. above our current frame. */ +# define CLEAR_THRESHOLD 100000 + /* We restart the clearing process after this many bytes of */ + /* allocation. Otherwise very heavily recursive programs */ + /* with sparse stacks may result in heaps that grow almost */ + /* without bounds. As the heap gets larger, collection */ + /* frequency decreases, thus clearing frequency would decrease, */ + /* thus more junk remains accessible, thus the heap gets */ + /* larger ... */ +# ifdef THREADS + if (++random_no % 13 == 0) { + limit = sp; + MAKE_HOTTER(limit, BIG_CLEAR_SIZE*sizeof(word)); + limit = (ptr_t)((word)limit & ~0xf); + /* Make it sufficiently aligned for assembly */ + /* implementations of GC_clear_stack_inner. */ + return GC_clear_stack_inner(arg, limit); + } else { + BZERO(dummy, SMALL_CLEAR_SIZE*sizeof(word)); + return arg; + } +# else + if (GC_gc_no > GC_stack_last_cleared) { + /* Start things over, so we clear the entire stack again */ + if (GC_stack_last_cleared == 0) GC_high_water = (ptr_t)GC_stackbottom; + GC_min_sp = GC_high_water; + GC_stack_last_cleared = GC_gc_no; + GC_bytes_allocd_at_reset = GC_bytes_allocd; + } + /* Adjust GC_high_water */ + MAKE_COOLER(GC_high_water, WORDS_TO_BYTES(DEGRADE_RATE) + GC_SLOP); + if (sp HOTTER_THAN GC_high_water) { + GC_high_water = sp; + } + MAKE_HOTTER(GC_high_water, GC_SLOP); + limit = GC_min_sp; + MAKE_HOTTER(limit, SLOP); + if (sp COOLER_THAN limit) { + limit = (ptr_t)((word)limit & ~0xf); + /* Make it sufficiently aligned for assembly */ + /* implementations of GC_clear_stack_inner. */ + GC_min_sp = sp; + return(GC_clear_stack_inner(arg, limit)); + } else if (GC_bytes_allocd - GC_bytes_allocd_at_reset > CLEAR_THRESHOLD) { + /* Restart clearing process, but limit how much clearing we do. */ + GC_min_sp = sp; + MAKE_HOTTER(GC_min_sp, CLEAR_THRESHOLD/4); + if (GC_min_sp HOTTER_THAN GC_high_water) GC_min_sp = GC_high_water; + GC_bytes_allocd_at_reset = GC_bytes_allocd; + } + return(arg); +# endif +} + + +/* Return a pointer to the base address of p, given a pointer to a */ +/* an address within an object. Return 0 o.w. */ +void * GC_base(void * p) +{ + ptr_t r; + struct hblk *h; + bottom_index *bi; + hdr *candidate_hdr; + ptr_t limit; + + r = p; + if (!GC_is_initialized) return 0; + h = HBLKPTR(r); + GET_BI(r, bi); + candidate_hdr = HDR_FROM_BI(bi, r); + if (candidate_hdr == 0) return(0); + /* If it's a pointer to the middle of a large object, move it */ + /* to the beginning. */ + while (IS_FORWARDING_ADDR_OR_NIL(candidate_hdr)) { + h = FORWARDED_ADDR(h,candidate_hdr); + r = (ptr_t)h; + candidate_hdr = HDR(h); + } + if (HBLK_IS_FREE(candidate_hdr)) return(0); + /* Make sure r points to the beginning of the object */ + r = (ptr_t)((word)r & ~(WORDS_TO_BYTES(1) - 1)); + { + size_t offset = HBLKDISPL(r); + signed_word sz = candidate_hdr -> hb_sz; + size_t obj_displ = offset % sz; + + r -= obj_displ; + limit = r + sz; + if (limit > (ptr_t)(h + 1) && sz <= HBLKSIZE) { + return(0); + } + if ((ptr_t)p >= limit) return(0); + } + return((void *)r); +} + + +/* Return the size of an object, given a pointer to its base. */ +/* (For small obects this also happens to work from interior pointers, */ +/* but that shouldn't be relied upon.) */ +size_t GC_size(void * p) +{ + hdr * hhdr = HDR(p); + + return hhdr -> hb_sz; +} + +size_t GC_get_heap_size(void) +{ + return GC_heapsize; +} + +size_t GC_get_free_bytes(void) +{ + return GC_large_free_bytes; +} + +size_t GC_get_bytes_since_gc(void) +{ + return GC_bytes_allocd; +} + +size_t GC_get_total_bytes(void) +{ + return GC_bytes_allocd+GC_bytes_allocd_before_gc; +} + +GC_bool GC_is_initialized = FALSE; + +# if defined(PARALLEL_MARK) || defined(THREAD_LOCAL_ALLOC) + extern void GC_init_parallel(void); +# endif /* PARALLEL_MARK || THREAD_LOCAL_ALLOC */ + +void GC_init(void) +{ + DCL_LOCK_STATE; + +#if defined(GC_WIN32_THREADS) && !defined(GC_PTHREADS) + if (!GC_is_initialized) { + BOOL (WINAPI *pfn) (LPCRITICAL_SECTION, DWORD) = NULL; + HMODULE hK32 = GetModuleHandleA("kernel32.dll"); + if (hK32) + pfn = (BOOL (WINAPI *) (LPCRITICAL_SECTION, DWORD)) + GetProcAddress (hK32, + "InitializeCriticalSectionAndSpinCount"); + if (pfn) + pfn(&GC_allocate_ml, 4000); + else + InitializeCriticalSection (&GC_allocate_ml); + } +#endif /* MSWIN32 */ + + LOCK(); + GC_init_inner(); + UNLOCK(); + +# if defined(PARALLEL_MARK) || defined(THREAD_LOCAL_ALLOC) + /* Make sure marker threads and started and thread local */ + /* allocation is initialized, in case we didn't get */ + /* called from GC_init_parallel(); */ + { + GC_init_parallel(); + } +# endif /* PARALLEL_MARK || THREAD_LOCAL_ALLOC */ + +# if defined(DYNAMIC_LOADING) && defined(DARWIN) + { + /* This must be called WITHOUT the allocation lock held + and before any threads are created */ + extern void GC_init_dyld(); + GC_init_dyld(); + } +# endif +} + +#if defined(MSWIN32) || defined(MSWINCE) + CRITICAL_SECTION GC_write_cs; +#endif + +#ifdef MSWIN32 + extern void GC_init_win32(void); +#endif + +extern void GC_setpagesize(); + + +#ifdef MSWIN32 +extern GC_bool GC_no_win32_dlls; +#else +# define GC_no_win32_dlls FALSE +#endif + +void GC_exit_check(void) +{ + GC_gcollect(); +} + +#ifdef SEARCH_FOR_DATA_START + extern void GC_init_linux_data_start(void); +#endif + +#ifdef UNIX_LIKE + +extern void GC_set_and_save_fault_handler(void (*handler)(int)); + +static void looping_handler(sig) +int sig; +{ + GC_err_printf("Caught signal %d: looping in handler\n", sig); + for(;;); +} + +static GC_bool installed_looping_handler = FALSE; + +static void maybe_install_looping_handler() +{ + /* Install looping handler before the write fault handler, so we */ + /* handle write faults correctly. */ + if (!installed_looping_handler && 0 != GETENV("GC_LOOP_ON_ABORT")) { + GC_set_and_save_fault_handler(looping_handler); + installed_looping_handler = TRUE; + } +} + +#else /* !UNIX_LIKE */ + +# define maybe_install_looping_handler() + +#endif + +void GC_init_inner() +{ +# if !defined(THREADS) && defined(GC_ASSERTIONS) + word dummy; +# endif + word initial_heap_sz = (word)MINHINCR; + + if (GC_is_initialized) return; +# if defined(MSWIN32) || defined(MSWINCE) + InitializeCriticalSection(&GC_write_cs); +# endif +# if (!defined(SMALL_CONFIG)) + if (0 != GETENV("GC_PRINT_STATS")) { + GC_print_stats = 1; + } + if (0 != GETENV("GC_PRINT_VERBOSE_STATS")) { + GC_print_stats = VERBOSE; + } +# if defined(UNIX_LIKE) + { + char * file_name = GETENV("GC_LOG_FILE"); + if (0 != file_name) { + int log_d = open(file_name, O_CREAT|O_WRONLY|O_APPEND, 0666); + if (log_d < 0) { + GC_log_printf("Failed to open %s as log file\n", file_name); + } else { + GC_log = log_d; + } + } + } +# endif +# endif +# ifndef NO_DEBUGGING + if (0 != GETENV("GC_DUMP_REGULARLY")) { + GC_dump_regularly = 1; + } +# endif +# ifdef KEEP_BACK_PTRS + { + char * backtraces_string = GETENV("GC_BACKTRACES"); + if (0 != backtraces_string) { + GC_backtraces = atol(backtraces_string); + if (backtraces_string[0] == '\0') GC_backtraces = 1; + } + } +# endif + if (0 != GETENV("GC_FIND_LEAK")) { + GC_find_leak = 1; + atexit(GC_exit_check); + } + if (0 != GETENV("GC_ALL_INTERIOR_POINTERS")) { + GC_all_interior_pointers = 1; + } + if (0 != GETENV("GC_DONT_GC")) { + GC_dont_gc = 1; + } + if (0 != GETENV("GC_PRINT_BACK_HEIGHT")) { + GC_print_back_height = 1; + } + if (0 != GETENV("GC_NO_BLACKLIST_WARNING")) { + GC_large_alloc_warn_interval = LONG_MAX; + } + { + char * addr_string = GETENV("GC_TRACE"); + if (0 != addr_string) { +# ifndef ENABLE_TRACE + WARN("Tracing not enabled: Ignoring GC_TRACE value\n", 0); +# else +# ifdef STRTOULL + long long addr = strtoull(addr_string, NULL, 16); +# else + long addr = strtoul(addr_string, NULL, 16); +# endif + if (addr < 0x1000) + WARN("Unlikely trace address: 0x%lx\n", (GC_word)addr); + GC_trace_addr = (ptr_t)addr; +# endif + } + } + { + char * time_limit_string = GETENV("GC_PAUSE_TIME_TARGET"); + if (0 != time_limit_string) { + long time_limit = atol(time_limit_string); + if (time_limit < 5) { + WARN("GC_PAUSE_TIME_TARGET environment variable value too small " + "or bad syntax: Ignoring\n", 0); + } else { + GC_time_limit = time_limit; + } + } + } + { + char * interval_string = GETENV("GC_LARGE_ALLOC_WARN_INTERVAL"); + if (0 != interval_string) { + long interval = atol(interval_string); + if (interval <= 0) { + WARN("GC_LARGE_ALLOC_WARN_INTERVAL environment variable has " + "bad value: Ignoring\n", 0); + } else { + GC_large_alloc_warn_interval = interval; + } + } + } + maybe_install_looping_handler(); + /* Adjust normal object descriptor for extra allocation. */ + if (ALIGNMENT > GC_DS_TAGS && EXTRA_BYTES != 0) { + GC_obj_kinds[NORMAL].ok_descriptor = ((word)(-ALIGNMENT) | GC_DS_LENGTH); + } + GC_setpagesize(); + GC_exclude_static_roots(beginGC_arrays, endGC_arrays); + GC_exclude_static_roots(beginGC_obj_kinds, endGC_obj_kinds); +# ifdef SEPARATE_GLOBALS + GC_exclude_static_roots(beginGC_objfreelist, endGC_objfreelist); + GC_exclude_static_roots(beginGC_aobjfreelist, endGC_aobjfreelist); +# endif +# ifdef MSWIN32 + GC_init_win32(); +# endif +# if defined(USE_PROC_FOR_LIBRARIES) && defined(GC_LINUX_THREADS) + WARN("USE_PROC_FOR_LIBRARIES + GC_LINUX_THREADS performs poorly.\n", 0); + /* If thread stacks are cached, they tend to be scanned in */ + /* entirety as part of the root set. This wil grow them to */ + /* maximum size, and is generally not desirable. */ +# endif +# if defined(SEARCH_FOR_DATA_START) + GC_init_linux_data_start(); +# endif +# if (defined(NETBSD) || defined(OPENBSD)) && defined(__ELF__) + GC_init_netbsd_elf(); +# endif +# if !defined(THREADS) || defined(GC_PTHREADS) || defined(GC_WIN32_THREADS) \ + || defined(GC_SOLARIS_THREADS) + if (GC_stackbottom == 0) { + GC_stackbottom = GC_get_main_stack_base(); +# if (defined(LINUX) || defined(HPUX)) && defined(IA64) + GC_register_stackbottom = GC_get_register_stack_base(); +# endif + } else { +# if (defined(LINUX) || defined(HPUX)) && defined(IA64) + if (GC_register_stackbottom == 0) { + WARN("GC_register_stackbottom should be set with GC_stackbottom\n", 0); + /* The following may fail, since we may rely on */ + /* alignment properties that may not hold with a user set */ + /* GC_stackbottom. */ + GC_register_stackbottom = GC_get_register_stack_base(); + } +# endif + } +# endif + /* Ignore gcc -Wall warnings on the following. */ + GC_STATIC_ASSERT(sizeof (ptr_t) == sizeof(word)); + GC_STATIC_ASSERT(sizeof (signed_word) == sizeof(word)); + GC_STATIC_ASSERT(sizeof (struct hblk) == HBLKSIZE); +# ifndef THREADS +# ifdef STACK_GROWS_DOWN + GC_ASSERT((word)(&dummy) <= (word)GC_stackbottom); +# else + GC_ASSERT((word)(&dummy) >= (word)GC_stackbottom); +# endif +# endif +# if !defined(_AUX_SOURCE) || defined(__GNUC__) + GC_ASSERT((word)(-1) > (word)0); + /* word should be unsigned */ +# endif + GC_ASSERT((ptr_t)(word)(-1) > (ptr_t)0); + /* Ptr_t comparisons should behave as unsigned comparisons. */ + GC_ASSERT((signed_word)(-1) < (signed_word)0); +# if !defined(SMALL_CONFIG) + if (GC_incremental || 0 != GETENV("GC_ENABLE_INCREMENTAL")) { + /* This used to test for !GC_no_win32_dlls. Why? */ + GC_setpagesize(); + /* For GWW_MPROTECT on Win32, this needs to happen before any */ + /* heap memory is allocated. */ + GC_dirty_init(); + GC_ASSERT(GC_bytes_allocd == 0) + GC_incremental = TRUE; + } +# endif /* !SMALL_CONFIG */ + + /* Add initial guess of root sets. Do this first, since sbrk(0) */ + /* might be used. */ + if (GC_REGISTER_MAIN_STATIC_DATA()) GC_register_data_segments(); + GC_init_headers(); + GC_bl_init(); + GC_mark_init(); + { + char * sz_str = GETENV("GC_INITIAL_HEAP_SIZE"); + if (sz_str != NULL) { + initial_heap_sz = atoi(sz_str); + if (initial_heap_sz <= MINHINCR * HBLKSIZE) { + WARN("Bad initial heap size %s - ignoring it.\n", + sz_str); + } + initial_heap_sz = divHBLKSZ(initial_heap_sz); + } + } + { + char * sz_str = GETENV("GC_MAXIMUM_HEAP_SIZE"); + if (sz_str != NULL) { + word max_heap_sz = (word)atol(sz_str); + if (max_heap_sz < initial_heap_sz * HBLKSIZE) { + WARN("Bad maximum heap size %s - ignoring it.\n", + sz_str); + } + if (0 == GC_max_retries) GC_max_retries = 2; + GC_set_max_heap_size(max_heap_sz); + } + } + if (!GC_expand_hp_inner(initial_heap_sz)) { + GC_err_printf("Can't start up: not enough memory\n"); + EXIT(); + } + GC_initialize_offsets(); + GC_register_displacement_inner(0L); +# if defined(GC_LINUX_THREADS) && defined(REDIRECT_MALLOC) + if (!GC_all_interior_pointers) { + /* TLS ABI uses pointer-sized offsets for dtv. */ + GC_register_displacement_inner(sizeof(void *)); + } +# endif + GC_init_size_map(); +# ifdef PCR + if (PCR_IL_Lock(PCR_Bool_false, PCR_allSigsBlocked, PCR_waitForever) + != PCR_ERes_okay) { + ABORT("Can't lock load state\n"); + } else if (PCR_IL_Unlock() != PCR_ERes_okay) { + ABORT("Can't unlock load state\n"); + } + PCR_IL_Unlock(); + GC_pcr_install(); +# endif + GC_is_initialized = TRUE; +# if defined(GC_PTHREADS) || defined(GC_WIN32_THREADS) + GC_thr_init(); +# endif + COND_DUMP; + /* Get black list set up and/or incremental GC started */ + if (!GC_dont_precollect || GC_incremental) GC_gcollect_inner(); +# ifdef STUBBORN_ALLOC + GC_stubborn_init(); +# endif +# if defined(GC_LINUX_THREADS) && defined(REDIRECT_MALLOC) + { + extern void GC_init_lib_bounds(void); + GC_init_lib_bounds(); + } +# endif + /* Convince lint that some things are used */ +# ifdef LINT + { + extern char * GC_copyright[]; + extern int GC_read(); + extern void GC_register_finalizer_no_order(); + + GC_noop(GC_copyright, GC_find_header, + GC_push_one, GC_call_with_alloc_lock, GC_read, + GC_dont_expand, +# ifndef NO_DEBUGGING + GC_dump, +# endif + GC_register_finalizer_no_order); + } +# endif +} + +void GC_enable_incremental(void) +{ +# if !defined(SMALL_CONFIG) && !defined(KEEP_BACK_PTRS) + /* If we are keeping back pointers, the GC itself dirties all */ + /* pages on which objects have been marked, making */ + /* incremental GC pointless. */ + if (!GC_find_leak) { + DCL_LOCK_STATE; + + LOCK(); + if (GC_incremental) goto out; + GC_setpagesize(); + /* if (GC_no_win32_dlls) goto out; Should be win32S test? */ + maybe_install_looping_handler(); /* Before write fault handler! */ + GC_incremental = TRUE; + if (!GC_is_initialized) { + GC_init_inner(); + } else { + GC_dirty_init(); + } + if (!GC_dirty_maintained) goto out; + if (GC_dont_gc) { + /* Can't easily do it. */ + UNLOCK(); + return; + } + if (GC_bytes_allocd > 0) { + /* There may be unmarked reachable objects */ + GC_gcollect_inner(); + } /* else we're OK in assuming everything's */ + /* clean since nothing can point to an */ + /* unmarked object. */ + GC_read_dirty(); +out: + UNLOCK(); + } else { + GC_init(); + } +# else + GC_init(); +# endif +} + + +#if defined(MSWIN32) || defined(MSWINCE) +# if defined(_MSC_VER) && defined(_DEBUG) +# include <crtdbg.h> +# endif +# ifdef OLD_WIN32_LOG_FILE +# define LOG_FILE _T("gc.log") +# endif + + HANDLE GC_stdout = 0; + + void GC_deinit() + { + if (GC_is_initialized) { + DeleteCriticalSection(&GC_write_cs); + } + } + +# ifndef THREADS +# define GC_need_to_lock 0 /* Not defined without threads */ +# endif + int GC_write(const char *buf, size_t len) + { + BOOL tmp; + DWORD written; + if (len == 0) + return 0; + if (GC_need_to_lock) EnterCriticalSection(&GC_write_cs); + if (GC_stdout == INVALID_HANDLE_VALUE) { + if (GC_need_to_lock) LeaveCriticalSection(&GC_write_cs); + return -1; + } else if (GC_stdout == 0) { + char * file_name = GETENV("GC_LOG_FILE"); + char logPath[_MAX_PATH + 5]; + + if (0 == file_name) { +# ifdef OLD_WIN32_LOG_FILE + strcpy(logPath, LOG_FILE); +# else + GetModuleFileName(NULL, logPath, _MAX_PATH); + strcat(logPath, ".log"); +# endif + file_name = logPath; + } + GC_stdout = CreateFile(logPath, GENERIC_WRITE, + FILE_SHARE_READ, + NULL, CREATE_ALWAYS, FILE_FLAG_WRITE_THROUGH, + NULL); + if (GC_stdout == INVALID_HANDLE_VALUE) + ABORT("Open of log file failed"); + } + tmp = WriteFile(GC_stdout, buf, (DWORD)len, &written, NULL); + if (!tmp) + DebugBreak(); +# if defined(_MSC_VER) && defined(_DEBUG) + _CrtDbgReport(_CRT_WARN, NULL, 0, NULL, "%.*s", len, buf); +# endif + if (GC_need_to_lock) LeaveCriticalSection(&GC_write_cs); + return tmp ? (int)written : -1; + } +# undef GC_need_to_lock + +#endif + +#if defined(OS2) || defined(MACOS) +FILE * GC_stdout = NULL; +FILE * GC_stderr = NULL; +FILE * GC_log = NULL; +int GC_tmp; /* Should really be local ... */ + + void GC_set_files() + { + if (GC_stdout == NULL) { + GC_stdout = stdout; + } + if (GC_stderr == NULL) { + GC_stderr = stderr; + } + if (GC_log == NULL) { + GC_log = stderr; + } + } +#endif + +#if !defined(OS2) && !defined(MACOS) && !defined(MSWIN32) && !defined(MSWINCE) + int GC_stdout = 1; + int GC_stderr = 2; + int GC_log = 2; +# if !defined(AMIGA) +# include <unistd.h> +# endif +#endif + +#if !defined(MSWIN32) && !defined(MSWINCE) && !defined(OS2) \ + && !defined(MACOS) && !defined(ECOS) && !defined(NOSYS) +int GC_write(fd, buf, len) +int fd; +const char *buf; +size_t len; +{ + register int bytes_written = 0; + register int result; + + while (bytes_written < len) { +# ifdef GC_SOLARIS_THREADS + result = syscall(SYS_write, fd, buf + bytes_written, + len - bytes_written); +# else + result = write(fd, buf + bytes_written, len - bytes_written); +# endif + if (-1 == result) return(result); + bytes_written += result; + } + return(bytes_written); +} +#endif /* UN*X */ + +#ifdef ECOS +int GC_write(fd, buf, len) +{ + _Jv_diag_write (buf, len); + return len; +} +#endif + +#ifdef NOSYS +int GC_write(fd, buf, len) +{ + /* No writing. */ + return len; +} +#endif + + +#if defined(MSWIN32) || defined(MSWINCE) + /* FIXME: This is pretty ugly ... */ +# define WRITE(f, buf, len) GC_write(buf, len) +#else +# if defined(OS2) || defined(MACOS) +# define WRITE(f, buf, len) (GC_set_files(), \ + GC_tmp = fwrite((buf), 1, (len), (f)), \ + fflush(f), GC_tmp) +# else +# define WRITE(f, buf, len) GC_write((f), (buf), (len)) +# endif +#endif + +#define BUFSZ 1024 +#ifdef _MSC_VER +# define vsnprintf _vsnprintf +#endif +/* A version of printf that is unlikely to call malloc, and is thus safer */ +/* to call from the collector in case malloc has been bound to GC_malloc. */ +/* Floating point arguments ans formats should be avoided, since fp */ +/* conversion is more likely to allocate. */ +/* Assumes that no more than BUFSZ-1 characters are written at once. */ +void GC_printf(const char *format, ...) +{ + va_list args; + char buf[BUFSZ+1]; + + va_start(args, format); + if (GC_quiet) return; + buf[BUFSZ] = 0x15; + (void) vsnprintf(buf, BUFSZ, format, args); + va_end(args); + if (buf[BUFSZ] != 0x15) ABORT("GC_printf clobbered stack"); + if (WRITE(GC_stdout, buf, strlen(buf)) < 0) ABORT("write to stdout failed"); +} + +void GC_err_printf(const char *format, ...) +{ + va_list args; + char buf[BUFSZ+1]; + + va_start(args, format); + buf[BUFSZ] = 0x15; + (void) vsnprintf(buf, BUFSZ, format, args); + va_end(args); + if (buf[BUFSZ] != 0x15) ABORT("GC_printf clobbered stack"); + if (WRITE(GC_stderr, buf, strlen(buf)) < 0) ABORT("write to stderr failed"); +} + +void GC_log_printf(const char *format, ...) +{ + va_list args; + char buf[BUFSZ+1]; + + va_start(args, format); + buf[BUFSZ] = 0x15; + (void) vsnprintf(buf, BUFSZ, format, args); + va_end(args); + if (buf[BUFSZ] != 0x15) ABORT("GC_printf clobbered stack"); + if (WRITE(GC_log, buf, strlen(buf)) < 0) ABORT("write to log failed"); +} + +void GC_err_puts(const char *s) +{ + if (WRITE(GC_stderr, s, strlen(s)) < 0) ABORT("write to stderr failed"); +} + +#if defined(LINUX) && !defined(SMALL_CONFIG) +void GC_err_write(buf, len) +const char *buf; +size_t len; +{ + if (WRITE(GC_stderr, buf, len) < 0) ABORT("write to stderr failed"); +} +#endif + +void GC_default_warn_proc(char *msg, GC_word arg) +{ + GC_err_printf(msg, arg); +} + +GC_warn_proc GC_current_warn_proc = GC_default_warn_proc; + +GC_warn_proc GC_set_warn_proc(GC_warn_proc p) +{ + GC_warn_proc result; + +# ifdef GC_WIN32_THREADS + GC_ASSERT(GC_is_initialized); +# endif + LOCK(); + result = GC_current_warn_proc; + GC_current_warn_proc = p; + UNLOCK(); + return(result); +} + +GC_word GC_set_free_space_divisor (GC_word value) +{ + GC_word old = GC_free_space_divisor; + GC_free_space_divisor = value; + return old; +} + +#ifndef PCR +void GC_abort(const char *msg) +{ +# if defined(MSWIN32) + (void) MessageBoxA(NULL, msg, "Fatal error in gc", MB_ICONERROR|MB_OK); +# else + GC_err_printf("%s\n", msg); +# endif + if (GETENV("GC_LOOP_ON_ABORT") != NULL) { + /* In many cases it's easier to debug a running process. */ + /* It's arguably nicer to sleep, but that makes it harder */ + /* to look at the thread if the debugger doesn't know much */ + /* about threads. */ + for(;;) {} + } +# if defined(MSWIN32) || defined(MSWINCE) + DebugBreak(); +# else + (void) abort(); +# endif +} +#endif + +void GC_enable() +{ + LOCK(); + GC_dont_gc--; + UNLOCK(); +} + +void GC_disable() +{ + LOCK(); + GC_dont_gc++; + UNLOCK(); +} + +/* Helper procedures for new kind creation. */ +void ** GC_new_free_list_inner() +{ + void *result = GC_INTERNAL_MALLOC((MAXOBJGRANULES+1)*sizeof(ptr_t), + PTRFREE); + if (result == 0) ABORT("Failed to allocate freelist for new kind"); + BZERO(result, (MAXOBJGRANULES+1)*sizeof(ptr_t)); + return result; +} + +void ** GC_new_free_list() +{ + void *result; + LOCK(); + result = GC_new_free_list_inner(); + UNLOCK(); + return result; +} + +unsigned GC_new_kind_inner(void **fl, GC_word descr, int adjust, int clear) +{ + unsigned result = GC_n_kinds++; + + if (GC_n_kinds > MAXOBJKINDS) ABORT("Too many kinds"); + GC_obj_kinds[result].ok_freelist = fl; + GC_obj_kinds[result].ok_reclaim_list = 0; + GC_obj_kinds[result].ok_descriptor = descr; + GC_obj_kinds[result].ok_relocate_descr = adjust; + GC_obj_kinds[result].ok_init = clear; + return result; +} + +unsigned GC_new_kind(void **fl, GC_word descr, int adjust, int clear) +{ + unsigned result; + LOCK(); + result = GC_new_kind_inner(fl, descr, adjust, clear); + UNLOCK(); + return result; +} + +unsigned GC_new_proc_inner(GC_mark_proc proc) +{ + unsigned result = GC_n_mark_procs++; + + if (GC_n_mark_procs > MAX_MARK_PROCS) ABORT("Too many mark procedures"); + GC_mark_procs[result] = proc; + return result; +} + +unsigned GC_new_proc(GC_mark_proc proc) +{ + unsigned result; + LOCK(); + result = GC_new_proc_inner(proc); + UNLOCK(); + return result; +} + +void * GC_call_with_stack_base(GC_stack_base_func fn, void *arg) +{ + int dummy; + struct GC_stack_base base; + + base.mem_base = (void *)&dummy; +# ifdef IA64 + base.reg_base = (void *)GC_save_regs_in_stack(); + /* Unnecessarily flushes register stack, */ + /* but that probably doesn't hurt. */ +# endif + return fn(&base, arg); +} + +#if !defined(NO_DEBUGGING) + +void GC_dump() +{ + GC_printf("***Static roots:\n"); + GC_print_static_roots(); + GC_printf("\n***Heap sections:\n"); + GC_print_heap_sects(); + GC_printf("\n***Free blocks:\n"); + GC_print_hblkfreelist(); + GC_printf("\n***Blocks in use:\n"); + GC_print_block_list(); + GC_printf("\n***Finalization statistics:\n"); + GC_print_finalization_stats(); +} + +#endif /* NO_DEBUGGING */ |