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/*
* 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.
*/
#include "private/gc_pmark.h"
#include <stdio.h>
#include <limits.h>
#include <stdarg.h>
#ifndef MSWINCE
# include <signal.h>
#endif
#ifdef GC_SOLARIS_THREADS
# include <sys/syscall.h>
#endif
#if defined(MSWIN32) || defined(MSWINCE) \
|| (defined(CYGWIN32) && defined(GC_READ_ENV_FILE))
# ifndef WIN32_LEAN_AND_MEAN
# define WIN32_LEAN_AND_MEAN 1
# endif
# define NOSERVICE
# include <windows.h>
#endif
#if defined(UNIX_LIKE) || defined(CYGWIN32) || defined(SYMBIAN)
# include <fcntl.h>
# include <sys/types.h>
# include <sys/stat.h>
#endif
#ifdef NONSTOP
# include <floss.h>
#endif
#ifdef THREADS
# ifdef PCR
# include "il/PCR_IL.h"
GC_INNER PCR_Th_ML GC_allocate_ml;
# elif defined(SN_TARGET_PS3)
# include <pthread.h>
GC_INNER pthread_mutex_t GC_allocate_ml;
# endif
/* For other platforms with threads, the lock and possibly */
/* GC_lock_holder variables are defined in the thread support code. */
#endif /* THREADS */
#ifdef DYNAMIC_LOADING
/* We need to register the main data segment. Returns TRUE unless */
/* this is done implicitly as part of dynamic library registration. */
# define GC_REGISTER_MAIN_STATIC_DATA() GC_register_main_static_data()
#elif defined(GC_DONT_REGISTER_MAIN_STATIC_DATA)
# define GC_REGISTER_MAIN_STATIC_DATA() FALSE
#else
/* Don't unnecessarily call GC_register_main_static_data() in case */
/* dyn_load.c isn't linked in. */
# define GC_REGISTER_MAIN_STATIC_DATA() TRUE
#endif
#ifdef NEED_CANCEL_DISABLE_COUNT
__thread unsigned char GC_cancel_disable_count = 0;
#endif
GC_FAR struct _GC_arrays GC_arrays /* = { 0 } */;
GC_INNER GC_bool GC_debugging_started = FALSE;
/* defined here so we don't have to load debug_malloc.o */
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; /* used also in pcr_interface.c */
#ifndef SMALL_CONFIG
GC_bool GC_print_stats = 0;
#endif
#ifdef GC_PRINT_BACK_HEIGHT
GC_INNER GC_bool GC_print_back_height = TRUE;
#else
GC_INNER GC_bool GC_print_back_height = FALSE;
#endif
#ifndef NO_DEBUGGING
GC_INNER GC_bool GC_dump_regularly = FALSE;
/* Generate regular debugging dumps. */
#endif
#ifdef KEEP_BACK_PTRS
GC_INNER 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
#ifndef SHORT_DBG_HDRS
# ifdef GC_FINDLEAK_DELAY_FREE
GC_INNER GC_bool GC_findleak_delay_free = TRUE;
# else
GC_INNER GC_bool GC_findleak_delay_free = FALSE;
# endif
#endif /* !SHORT_DBG_HDRS */
#ifdef ALL_INTERIOR_POINTERS
int GC_all_interior_pointers = 1;
#else
int GC_all_interior_pointers = 0;
#endif
#ifdef FINALIZE_ON_DEMAND
int GC_finalize_on_demand = 1;
#else
int GC_finalize_on_demand = 0;
#endif
#ifdef JAVA_FINALIZATION
int GC_java_finalization = 1;
#else
int GC_java_finalization = 0;
#endif
/* All accesses to it should be synchronized to avoid data races. */
GC_finalizer_notifier_proc GC_finalizer_notifier =
(GC_finalizer_notifier_proc)0;
#ifdef GC_FORCE_UNMAP_ON_GCOLLECT
/* Has no effect unless USE_MUNMAP. */
/* Has no effect on implicitly-initiated garbage collections. */
GC_INNER GC_bool GC_force_unmap_on_gcollect = TRUE;
#else
GC_INNER GC_bool GC_force_unmap_on_gcollect = FALSE;
#endif
#ifndef GC_LARGE_ALLOC_WARN_INTERVAL
# define GC_LARGE_ALLOC_WARN_INTERVAL 5
#endif
GC_INNER long GC_large_alloc_warn_interval = GC_LARGE_ALLOC_WARN_INTERVAL;
/* Interval between unsuppressed warnings. */
STATIC void * GC_CALLBACK GC_default_oom_fn(
size_t bytes_requested GC_ATTR_UNUSED)
{
return(0);
}
/* All accesses to it should be synchronized to avoid data races. */
GC_oom_func GC_oom_fn = GC_default_oom_fn;
#ifdef CAN_HANDLE_FORK
# ifdef HANDLE_FORK
GC_INNER GC_bool GC_handle_fork = TRUE;
/* The value is examined by GC_thr_init. */
# else
GC_INNER GC_bool GC_handle_fork = FALSE;
# endif
#endif /* CAN_HANDLE_FORK */
/* Overrides the default handle-fork mode. Non-zero value means GC */
/* should install proper pthread_atfork handlers (or abort if not */
/* supported). Has effect only if called before GC_INIT. */
GC_API void GC_CALL GC_set_handle_fork(int value GC_ATTR_UNUSED)
{
# ifdef CAN_HANDLE_FORK
if (!GC_is_initialized)
GC_handle_fork = (GC_bool)value;
# elif defined(THREADS) || (defined(DARWIN) && defined(MPROTECT_VDB))
if (!GC_is_initialized && value)
ABORT("fork() handling disabled");
# else
/* No at-fork handler is needed in the single-threaded mode. */
# endif
}
/* 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 algorithm (but we precompute it). */
STATIC 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);
# ifndef _MSC_VER
GC_ASSERT(GC_size_map[i] < TINY_FREELISTS);
/* Seems to tickle bug in VC++ 2008 for AMD64 */
# endif
}
/* 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. */
GC_INNER 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.
*/
# ifdef THREADS
# define BIG_CLEAR_SIZE 2048 /* Clear this much now and then. */
# define SMALL_CLEAR_SIZE 256 /* Clear this much every time. */
# else
STATIC word GC_stack_last_cleared = 0; /* GC_no when we last did this */
STATIC ptr_t GC_min_sp = NULL;
/* Coolest stack pointer value from which */
/* we've already cleared the stack. */
STATIC ptr_t GC_high_water = NULL;
/* "hottest" stack pointer value we have seen */
/* recently. Degrades over time. */
STATIC word GC_bytes_allocd_at_reset = 0;
# define DEGRADE_RATE 50
# endif
# define CLEAR_SIZE 213 /* Granularity for GC_clear_stack_inner */
#if defined(ASM_CLEAR_CODE)
void *GC_clear_stack_inner(void *, ptr_t);
#else
/* Clear the stack up to about limit. Return arg. This function is */
/* not static because it could also be errorneously defined in .S */
/* file, so this error would be caught by the linker. */
void * GC_clear_stack_inner(void *arg, ptr_t limit)
{
volatile word dummy[CLEAR_SIZE];
BZERO((/* no volatile */ void *)dummy, sizeof(dummy));
if ((word)GC_approx_sp() COOLER_THAN (word)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. */
GC_API void * GC_CALL 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 ((word)sp HOTTER_THAN (word)GC_high_water) {
GC_high_water = sp;
}
MAKE_HOTTER(GC_high_water, GC_SLOP);
limit = GC_min_sp;
MAKE_HOTTER(limit, SLOP);
if ((word)sp COOLER_THAN (word)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 ((word)GC_min_sp HOTTER_THAN (word)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. */
GC_API void * GC_CALL GC_base(void * p)
{
ptr_t r;
struct hblk *h;
bottom_index *bi;
hdr *candidate_hdr;
ptr_t limit;
r = p;
if (!EXPECT(GC_is_initialized, TRUE)) 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);
word sz = candidate_hdr -> hb_sz;
size_t obj_displ = offset % sz;
r -= obj_displ;
limit = r + sz;
if ((word)limit > (word)(h + 1) && sz <= HBLKSIZE) {
return(0);
}
if ((word)p >= (word)limit) return(0);
}
return((void *)r);
}
/* Return TRUE if and only if p points to somewhere in GC heap. */
GC_API int GC_CALL GC_is_heap_ptr(const void *p)
{
bottom_index *bi;
GC_ASSERT(GC_is_initialized);
GET_BI(p, bi);
return HDR_FROM_BI(bi, p) != 0;
}
/* Return the size of an object, given a pointer to its base. */
/* (For small objects this also happens to work from interior pointers, */
/* but that shouldn't be relied upon.) */
GC_API size_t GC_CALL GC_size(const void * p)
{
hdr * hhdr = HDR(p);
return hhdr -> hb_sz;
}
/* These getters remain unsynchronized for compatibility (since some */
/* clients could call some of them from a GC callback holding the */
/* allocator lock). */
GC_API size_t GC_CALL GC_get_heap_size(void)
{
/* ignore the memory space returned to OS (i.e. count only the */
/* space owned by the garbage collector) */
return (size_t)(GC_heapsize - GC_unmapped_bytes);
}
GC_API size_t GC_CALL GC_get_free_bytes(void)
{
/* ignore the memory space returned to OS */
return (size_t)(GC_large_free_bytes - GC_unmapped_bytes);
}
GC_API size_t GC_CALL GC_get_unmapped_bytes(void)
{
return (size_t)GC_unmapped_bytes;
}
GC_API size_t GC_CALL GC_get_bytes_since_gc(void)
{
return (size_t)GC_bytes_allocd;
}
GC_API size_t GC_CALL GC_get_total_bytes(void)
{
return (size_t)(GC_bytes_allocd + GC_bytes_allocd_before_gc);
}
/* Return the heap usage information. This is a thread-safe (atomic) */
/* alternative for the five above getters. NULL pointer is allowed for */
/* any argument. Returned (filled in) values are of word type. */
GC_API void GC_CALL GC_get_heap_usage_safe(GC_word *pheap_size,
GC_word *pfree_bytes, GC_word *punmapped_bytes,
GC_word *pbytes_since_gc, GC_word *ptotal_bytes)
{
DCL_LOCK_STATE;
LOCK();
if (pheap_size != NULL)
*pheap_size = GC_heapsize - GC_unmapped_bytes;
if (pfree_bytes != NULL)
*pfree_bytes = GC_large_free_bytes - GC_unmapped_bytes;
if (punmapped_bytes != NULL)
*punmapped_bytes = GC_unmapped_bytes;
if (pbytes_since_gc != NULL)
*pbytes_since_gc = GC_bytes_allocd;
if (ptotal_bytes != NULL)
*ptotal_bytes = GC_bytes_allocd + GC_bytes_allocd_before_gc;
UNLOCK();
}
#if defined(GC_DARWIN_THREADS) || defined(GC_OPENBSD_THREADS) \
|| defined(GC_WIN32_THREADS) || (defined(NACL) && defined(THREADS))
/* GC does not use signals to suspend and restart threads. */
GC_API void GC_CALL GC_set_suspend_signal(int sig GC_ATTR_UNUSED)
{
/* empty */
}
GC_API void GC_CALL GC_set_thr_restart_signal(int sig GC_ATTR_UNUSED)
{
/* empty */
}
GC_API int GC_CALL GC_get_suspend_signal(void)
{
return -1;
}
GC_API int GC_CALL GC_get_thr_restart_signal(void)
{
return -1;
}
#endif /* GC_DARWIN_THREADS || GC_WIN32_THREADS || ... */
#if !defined(_MAX_PATH) && (defined(MSWIN32) || defined(MSWINCE) \
|| defined(CYGWIN32))
# define _MAX_PATH MAX_PATH
#endif
#ifdef GC_READ_ENV_FILE
/* This works for Win32/WinCE for now. Really useful only for WinCE. */
STATIC char *GC_envfile_content = NULL;
/* The content of the GC "env" file with CR and */
/* LF replaced to '\0'. NULL if the file is */
/* missing or empty. Otherwise, always ends */
/* with '\0'. */
STATIC unsigned GC_envfile_length = 0;
/* Length of GC_envfile_content (if non-NULL). */
# ifndef GC_ENVFILE_MAXLEN
# define GC_ENVFILE_MAXLEN 0x4000
# endif
/* The routine initializes GC_envfile_content from the GC "env" file. */
STATIC void GC_envfile_init(void)
{
# if defined(MSWIN32) || defined(MSWINCE) || defined(CYGWIN32)
HANDLE hFile;
char *content;
unsigned ofs;
unsigned len;
DWORD nBytesRead;
TCHAR path[_MAX_PATH + 0x10]; /* buffer for path + ext */
len = (unsigned)GetModuleFileName(NULL /* hModule */, path,
_MAX_PATH + 1);
/* If GetModuleFileName() has failed then len is 0. */
if (len > 4 && path[len - 4] == (TCHAR)'.') {
len -= 4; /* strip executable file extension */
}
BCOPY(TEXT(".gc.env"), &path[len], sizeof(TEXT(".gc.env")));
hFile = CreateFile(path, GENERIC_READ,
FILE_SHARE_READ | FILE_SHARE_WRITE,
NULL /* lpSecurityAttributes */, OPEN_EXISTING,
FILE_ATTRIBUTE_NORMAL, NULL /* hTemplateFile */);
if (hFile == INVALID_HANDLE_VALUE)
return; /* the file is absent or the operation is failed */
len = (unsigned)GetFileSize(hFile, NULL);
if (len <= 1 || len >= GC_ENVFILE_MAXLEN) {
CloseHandle(hFile);
return; /* invalid file length - ignoring the file content */
}
/* At this execution point, GC_setpagesize() and GC_init_win32() */
/* must already be called (for GET_MEM() to work correctly). */
content = (char *)GET_MEM(len + 1);
if (content == NULL) {
CloseHandle(hFile);
return; /* allocation failure */
}
ofs = 0;
nBytesRead = (DWORD)-1L;
/* Last ReadFile() call should clear nBytesRead on success. */
while (ReadFile(hFile, content + ofs, len - ofs + 1, &nBytesRead,
NULL /* lpOverlapped */) && nBytesRead != 0) {
if ((ofs += nBytesRead) > len)
break;
}
CloseHandle(hFile);
if (ofs != len || nBytesRead != 0)
return; /* read operation is failed - ignoring the file content */
content[ofs] = '\0';
while (ofs-- > 0) {
if (content[ofs] == '\r' || content[ofs] == '\n')
content[ofs] = '\0';
}
GC_envfile_length = len + 1;
GC_envfile_content = content;
# endif
}
/* This routine scans GC_envfile_content for the specified */
/* environment variable (and returns its value if found). */
GC_INNER char * GC_envfile_getenv(const char *name)
{
char *p;
char *end_of_content;
unsigned namelen;
# ifndef NO_GETENV
p = getenv(name); /* try the standard getenv() first */
if (p != NULL)
return *p != '\0' ? p : NULL;
# endif
p = GC_envfile_content;
if (p == NULL)
return NULL; /* "env" file is absent (or empty) */
namelen = strlen(name);
if (namelen == 0) /* a sanity check */
return NULL;
for (end_of_content = p + GC_envfile_length;
p != end_of_content; p += strlen(p) + 1) {
if (strncmp(p, name, namelen) == 0 && *(p += namelen) == '=') {
p++; /* the match is found; skip '=' */
return *p != '\0' ? p : NULL;
}
/* If not matching then skip to the next line. */
}
return NULL; /* no match found */
}
#endif /* GC_READ_ENV_FILE */
GC_INNER GC_bool GC_is_initialized = FALSE;
#if (defined(MSWIN32) || defined(MSWINCE)) && defined(THREADS)
GC_INNER CRITICAL_SECTION GC_write_cs;
#endif
STATIC void GC_exit_check(void)
{
if (GC_find_leak) {
GC_gcollect();
}
}
#if defined(UNIX_LIKE) && !defined(NO_DEBUGGING)
static void looping_handler(int sig)
{
GC_err_printf("Caught signal %d: looping in handler\n", sig);
for (;;) {
/* empty */
}
}
static GC_bool installed_looping_handler = FALSE;
static void maybe_install_looping_handler(void)
{
/* 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
#if !defined(OS2) && !defined(MACOS) && !defined(MSWIN32) && !defined(MSWINCE)
STATIC int GC_stdout = 1;
STATIC int GC_stderr = 2;
STATIC int GC_log = 2; /* stderr */
#endif
STATIC word GC_parse_mem_size_arg(const char *str)
{
char *endptr;
word result = 0; /* bad value */
char ch;
if (*str != '\0') {
result = (word)STRTOULL(str, &endptr, 10);
ch = *endptr;
if (ch != '\0') {
if (*(endptr + 1) != '\0')
return 0;
/* Allow k, M or G suffix. */
switch (ch) {
case 'K':
case 'k':
result <<= 10;
break;
case 'M':
case 'm':
result <<= 20;
break;
case 'G':
case 'g':
result <<= 30;
break;
default:
result = 0;
}
}
}
return result;
}
#define GC_LOG_STD_NAME "gc.log"
GC_API void GC_CALL GC_init(void)
{
/* LOCK(); -- no longer does anything this early. */
word initial_heap_sz;
IF_CANCEL(int cancel_state;)
if (EXPECT(GC_is_initialized, TRUE)) return;
# ifdef REDIRECT_MALLOC
{
static GC_bool init_started = FALSE;
if (init_started)
ABORT("Redirected malloc() called during GC init");
init_started = TRUE;
}
# endif
# ifdef GC_INITIAL_HEAP_SIZE
initial_heap_sz = divHBLKSZ(GC_INITIAL_HEAP_SIZE);
# else
initial_heap_sz = (word)MINHINCR;
# endif
DISABLE_CANCEL(cancel_state);
/* Note that although we are nominally called with the */
/* allocation lock held, the allocation lock is now */
/* only really acquired once a second thread is forked.*/
/* And the initialization code needs to run before */
/* then. Thus we really don't hold any locks, and can */
/* in fact safely initialize them here. */
# ifdef THREADS
GC_ASSERT(!GC_need_to_lock);
# ifdef SN_TARGET_PS3
{
pthread_mutexattr_t mattr;
pthread_mutexattr_init(&mattr);
pthread_mutex_init(&GC_allocate_ml, &mattr);
pthread_mutexattr_destroy(&mattr);
}
# endif
# endif /* THREADS */
# if defined(GC_WIN32_THREADS) && !defined(GC_PTHREADS)
{
# ifndef MSWINCE
BOOL (WINAPI *pfn) (LPCRITICAL_SECTION, DWORD) = NULL;
HMODULE hK32 = GetModuleHandle(TEXT("kernel32.dll"));
if (hK32)
pfn = (BOOL (WINAPI *) (LPCRITICAL_SECTION, DWORD))
GetProcAddress (hK32,
"InitializeCriticalSectionAndSpinCount");
if (pfn)
pfn(&GC_allocate_ml, 4000);
else
# endif /* !MSWINCE */
/* else */ InitializeCriticalSection (&GC_allocate_ml);
}
# endif /* GC_WIN32_THREADS */
# if (defined(MSWIN32) || defined(MSWINCE)) && defined(THREADS)
InitializeCriticalSection(&GC_write_cs);
# endif
GC_setpagesize();
# ifdef MSWIN32
GC_init_win32();
# endif
# ifdef GC_READ_ENV_FILE
GC_envfile_init();
# endif
# ifndef SMALL_CONFIG
# ifdef GC_PRINT_VERBOSE_STATS
/* This is useful for debugging and profiling on platforms with */
/* missing getenv() (like WinCE). */
GC_print_stats = VERBOSE;
# else
if (0 != GETENV("GC_PRINT_VERBOSE_STATS")) {
GC_print_stats = VERBOSE;
} else if (0 != GETENV("GC_PRINT_STATS")) {
GC_print_stats = 1;
}
# endif
# if defined(UNIX_LIKE) || defined(CYGWIN32) || defined(SYMBIAN)
{
char * file_name = GETENV("GC_LOG_FILE");
# ifdef GC_LOG_TO_FILE_ALWAYS
if (NULL == file_name)
file_name = GC_LOG_STD_NAME;
# else
if (0 != file_name)
# endif
{
int log_d = open(file_name, O_CREAT|O_WRONLY|O_APPEND, 0666);
if (log_d < 0) {
GC_err_printf("Failed to open %s as log file\n", file_name);
} else {
char *str;
GC_log = log_d;
str = GETENV("GC_ONLY_LOG_TO_FILE");
# ifdef GC_ONLY_LOG_TO_FILE
/* The similar environment variable set to "0" */
/* overrides the effect of the macro defined. */
if (str != NULL && *str == '0' && *(str + 1) == '\0')
# else
/* Otherwise setting the environment variable */
/* to anything other than "0" will prevent from */
/* redirecting stdout/err to the log file. */
if (str == NULL || (*str == '0' && *(str + 1) == '\0'))
# endif
{
GC_stdout = log_d;
GC_stderr = log_d;
}
}
}
}
# endif
# endif /* !SMALL_CONFIG */
# ifndef NO_DEBUGGING
if (0 != GETENV("GC_DUMP_REGULARLY")) {
GC_dump_regularly = TRUE;
}
# 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;
}
# ifndef SHORT_DBG_HDRS
if (0 != GETENV("GC_FINDLEAK_DELAY_FREE")) {
GC_findleak_delay_free = TRUE;
}
# endif
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 = TRUE;
}
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
word addr = (word)STRTOULL(addr_string, NULL, 16);
if (addr < 0x1000)
WARN("Unlikely trace address: %p\n", addr);
GC_trace_addr = (ptr_t)addr;
# endif
}
}
# ifndef GC_DISABLE_INCREMENTAL
{
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;
}
}
}
# endif
# ifndef SMALL_CONFIG
{
char * full_freq_string = GETENV("GC_FULL_FREQUENCY");
if (full_freq_string != NULL) {
int full_freq = atoi(full_freq_string);
if (full_freq > 0)
GC_full_freq = full_freq;
}
}
# endif
{
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;
}
}
}
{
char * space_divisor_string = GETENV("GC_FREE_SPACE_DIVISOR");
if (space_divisor_string != NULL) {
int space_divisor = atoi(space_divisor_string);
if (space_divisor > 0)
GC_free_space_divisor = (GC_word)space_divisor;
}
}
# ifdef USE_MUNMAP
{
char * string = GETENV("GC_UNMAP_THRESHOLD");
if (string != NULL) {
if (*string == '0' && *(string + 1) == '\0') {
/* "0" is used to disable unmapping. */
GC_unmap_threshold = 0;
} else {
int unmap_threshold = atoi(string);
if (unmap_threshold > 0)
GC_unmap_threshold = unmap_threshold;
}
}
}
{
char * string = GETENV("GC_FORCE_UNMAP_ON_GCOLLECT");
if (string != NULL) {
if (*string == '0' && *(string + 1) == '\0') {
/* "0" is used to turn off the mode. */
GC_force_unmap_on_gcollect = FALSE;
} else {
GC_force_unmap_on_gcollect = TRUE;
}
}
}
{
char * string = GETENV("GC_USE_ENTIRE_HEAP");
if (string != NULL) {
if (*string == '0' && *(string + 1) == '\0') {
/* "0" is used to turn off the mode. */
GC_use_entire_heap = FALSE;
} else {
GC_use_entire_heap = TRUE;
}
}
}
# endif
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_exclude_static_roots_inner(beginGC_arrays, endGC_arrays);
GC_exclude_static_roots_inner(beginGC_obj_kinds, endGC_obj_kinds);
# ifdef SEPARATE_GLOBALS
GC_exclude_static_roots_inner(beginGC_objfreelist, endGC_objfreelist);
GC_exclude_static_roots_inner(beginGC_aobjfreelist, endGC_aobjfreelist);
# 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(__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
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
GC_ASSERT(!((word)GC_stackbottom HOTTER_THAN (word)GC_approx_sp()));
# endif
# if !defined(_AUX_SOURCE) || defined(__GNUC__)
GC_STATIC_ASSERT((word)(-1) > (word)0);
/* word should be unsigned */
# endif
/* We no longer check for ((void*)(-1) > NULL) since all pointers */
/* are explicitly cast to word in every less-greater comparison. */
GC_STATIC_ASSERT((signed_word)(-1) < (signed_word)0);
# ifndef GC_DISABLE_INCREMENTAL
if (GC_incremental || 0 != GETENV("GC_ENABLE_INCREMENTAL")) {
/* For GWW_VDB 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
/* 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 = GC_parse_mem_size_arg(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 = GC_parse_mem_size_arg(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();
} else {
GC_requested_heapsize += initial_heap_sz;
}
if (GC_all_interior_pointers)
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");
} else if (PCR_IL_Unlock() != PCR_ERes_okay) {
ABORT("Can't unlock load state");
}
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
/* Convince lint that some things are used */
# ifdef LINT
{
extern char * const GC_copyright[];
GC_noop(GC_copyright, GC_find_header, GC_push_one,
GC_call_with_alloc_lock, GC_dont_expand,
# ifndef NO_DEBUGGING
GC_dump,
# endif
GC_register_finalizer_no_order);
}
# endif
if (GC_find_leak) {
/* This is to give us at least one chance to detect leaks. */
/* This may report some very benign leaks, but ... */
atexit(GC_exit_check);
}
/* The rest of this again assumes we don't really hold */
/* the allocation lock. */
# if defined(PARALLEL_MARK) || defined(THREAD_LOCAL_ALLOC)
/* Make sure marker threads are 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. */
GC_init_dyld();
# endif
RESTORE_CANCEL(cancel_state);
}
GC_API void GC_CALL GC_enable_incremental(void)
{
# if !defined(GC_DISABLE_INCREMENTAL) && !defined(KEEP_BACK_PTRS)
DCL_LOCK_STATE;
/* 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 && 0 == GETENV("GC_DISABLE_INCREMENTAL")) {
LOCK();
if (!GC_incremental) {
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();
} else {
GC_dirty_init();
}
if (GC_dirty_maintained && !GC_dont_gc) {
/* Can't easily do it if GC_dont_gc. */
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();
}
}
UNLOCK();
return;
}
# endif
GC_init();
}
#if defined(MSWIN32) || defined(MSWINCE)
# if defined(_MSC_VER) && defined(_DEBUG) && !defined(MSWINCE)
# include <crtdbg.h>
# endif
STATIC HANDLE GC_log = 0;
void GC_deinit(void)
{
# ifdef THREADS
if (GC_is_initialized) {
DeleteCriticalSection(&GC_write_cs);
}
# endif
}
# ifdef THREADS
# ifdef PARALLEL_MARK
# define IF_NEED_TO_LOCK(x) if (GC_parallel || GC_need_to_lock) x
# else
# define IF_NEED_TO_LOCK(x) if (GC_need_to_lock) x
# endif
# else
# define IF_NEED_TO_LOCK(x)
# endif /* !THREADS */
STATIC HANDLE GC_CreateLogFile(void)
{
HANDLE hFile;
TCHAR *logPath;
BOOL appendToFile = FALSE;
# if !defined(NO_GETENV_WIN32) || !defined(OLD_WIN32_LOG_FILE)
TCHAR pathBuf[_MAX_PATH + 0x10]; /* buffer for path + ext */
logPath = pathBuf;
# endif
/* Use GetEnvironmentVariable instead of GETENV() for unicode support. */
# ifndef NO_GETENV_WIN32
if (GetEnvironmentVariable(TEXT("GC_LOG_FILE"), pathBuf,
_MAX_PATH + 1) - 1U < (DWORD)_MAX_PATH) {
appendToFile = TRUE;
} else
# endif
/* else */ {
/* Env var not found or its value too long. */
# ifdef OLD_WIN32_LOG_FILE
logPath = TEXT(GC_LOG_STD_NAME);
# else
int len = (int)GetModuleFileName(NULL /* hModule */, pathBuf,
_MAX_PATH + 1);
/* If GetModuleFileName() has failed then len is 0. */
if (len > 4 && pathBuf[len - 4] == (TCHAR)'.') {
len -= 4; /* strip executable file extension */
}
BCOPY(TEXT("." GC_LOG_STD_NAME), &pathBuf[len],
sizeof(TEXT("." GC_LOG_STD_NAME)));
# endif
}
hFile = CreateFile(logPath, GENERIC_WRITE, FILE_SHARE_READ,
NULL /* lpSecurityAttributes */,
appendToFile ? OPEN_ALWAYS : CREATE_ALWAYS,
GC_print_stats == VERBOSE ? FILE_ATTRIBUTE_NORMAL :
/* immediately flush writes unless very verbose */
FILE_ATTRIBUTE_NORMAL | FILE_FLAG_WRITE_THROUGH,
NULL /* hTemplateFile */);
# ifndef NO_GETENV_WIN32
if (appendToFile && hFile != INVALID_HANDLE_VALUE) {
LONG posHigh = 0;
(void)SetFilePointer(hFile, 0, &posHigh, FILE_END);
/* Seek to file end (ignoring any error) */
}
# endif
return hFile;
}
STATIC int GC_write(const char *buf, size_t len)
{
BOOL tmp;
DWORD written;
if (len == 0)
return 0;
IF_NEED_TO_LOCK(EnterCriticalSection(&GC_write_cs));
# ifdef THREADS
GC_ASSERT(!GC_write_disabled);
# endif
if (GC_log == INVALID_HANDLE_VALUE) {
IF_NEED_TO_LOCK(LeaveCriticalSection(&GC_write_cs));
return -1;
} else if (GC_log == 0) {
GC_log = GC_CreateLogFile();
/* Ignore open log failure if the collector is built with */
/* print_stats always set on. */
# ifndef GC_PRINT_VERBOSE_STATS
if (GC_log == INVALID_HANDLE_VALUE)
ABORT("Open of log file failed");
# endif
}
tmp = WriteFile(GC_log, buf, (DWORD)len, &written, NULL);
if (!tmp)
DebugBreak();
# if defined(_MSC_VER) && defined(_DEBUG)
# ifdef MSWINCE
/* There is no CrtDbgReport() in WinCE */
{
WCHAR wbuf[1024];
/* Always use Unicode variant of OutputDebugString() */
wbuf[MultiByteToWideChar(CP_ACP, 0 /* dwFlags */,
buf, len, wbuf,
sizeof(wbuf) / sizeof(wbuf[0]) - 1)] = 0;
OutputDebugStringW(wbuf);
}
# else
_CrtDbgReport(_CRT_WARN, NULL, 0, NULL, "%.*s", len, buf);
# endif
# endif
IF_NEED_TO_LOCK(LeaveCriticalSection(&GC_write_cs));
return tmp ? (int)written : -1;
}
/* FIXME: This is pretty ugly ... */
# define WRITE(f, buf, len) GC_write(buf, len)
#elif defined(OS2) || defined(MACOS)
STATIC FILE * GC_stdout = NULL;
STATIC FILE * GC_stderr = NULL;
STATIC FILE * GC_log = NULL;
/* Initialize GC_log (and the friends) passed to GC_write(). */
STATIC void GC_set_files(void)
{
if (GC_stdout == NULL) {
GC_stdout = stdout;
}
if (GC_stderr == NULL) {
GC_stderr = stderr;
}
if (GC_log == NULL) {
GC_log = stderr;
}
}
GC_INLINE int GC_write(FILE *f, const char *buf, size_t len)
{
int res = fwrite(buf, 1, len, f);
fflush(f);
return res;
}
# define WRITE(f, buf, len) (GC_set_files(), GC_write(f, buf, len))
#else
# if !defined(AMIGA) && !defined(__CC_ARM)
# include <unistd.h>
# endif
STATIC int GC_write(int fd, const char *buf, size_t len)
{
# if defined(ECOS) || defined(NOSYS)
# ifdef ECOS
/* FIXME: This seems to be defined nowhere at present. */
/* _Jv_diag_write(buf, len); */
# else
/* No writing. */
# endif
return len;
# else
int bytes_written = 0;
int result;
IF_CANCEL(int cancel_state;)
DISABLE_CANCEL(cancel_state);
while ((size_t)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) {
RESTORE_CANCEL(cancel_state);
return(result);
}
bytes_written += result;
}
RESTORE_CANCEL(cancel_state);
return(bytes_written);
# endif
}
# define WRITE(f, buf, len) GC_write(f, buf, len)
#endif /* !MSWIN32 && !OS2 && !MACOS */
#define BUFSZ 1024
#ifdef NO_VSNPRINTF
/* In case this function is missing (eg., in DJGPP v2.0.3). */
# define vsnprintf(buf, bufsz, format, args) vsprintf(buf, format, args)
#elif defined(_MSC_VER)
# ifdef MSWINCE
/* _vsnprintf is deprecated in WinCE */
# define vsnprintf StringCchVPrintfA
# else
# define vsnprintf _vsnprintf
# endif
#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 and formats should be avoided, since FP */
/* conversion is more likely to allocate memory. */
/* Assumes that no more than BUFSZ-1 characters are written at once. */
#define GC_PRINTF_IMPL(f, f_name, 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(f, buf, strlen(buf)) < 0) \
ABORT("write to " f_name " failed"); \
}
void GC_printf(const char *format, ...)
{
if (GC_quiet) return;
GC_PRINTF_IMPL(GC_stdout, "stdout", format);
}
void GC_err_printf(const char *format, ...)
{
GC_PRINTF_IMPL(GC_stderr, "stderr", format);
}
void GC_log_printf(const char *format, ...)
{
GC_PRINTF_IMPL(GC_log, "log", format);
}
/* This is equivalent to GC_err_printf("%s",s). */
void GC_err_puts(const char *s)
{
if (WRITE(GC_stderr, s, strlen(s)) < 0) ABORT("write to stderr failed");
}
STATIC void GC_CALLBACK GC_default_warn_proc(char *msg, GC_word arg)
{
GC_err_printf(msg, arg);
}
GC_INNER GC_warn_proc GC_current_warn_proc = GC_default_warn_proc;
/* This is recommended for production code (release). */
GC_API void GC_CALLBACK GC_ignore_warn_proc(char *msg, GC_word arg)
{
if (GC_print_stats) {
/* Don't ignore warnings if stats printing is on. */
GC_default_warn_proc(msg, arg);
}
}
GC_API void GC_CALL GC_set_warn_proc(GC_warn_proc p)
{
DCL_LOCK_STATE;
GC_ASSERT(p != 0);
# ifdef GC_WIN32_THREADS
# ifdef CYGWIN32
/* Need explicit GC_INIT call */
GC_ASSERT(GC_is_initialized);
# else
if (!GC_is_initialized) GC_init();
# endif
# endif
LOCK();
GC_current_warn_proc = p;
UNLOCK();
}
GC_API GC_warn_proc GC_CALL GC_get_warn_proc(void)
{
GC_warn_proc result;
DCL_LOCK_STATE;
LOCK();
result = GC_current_warn_proc;
UNLOCK();
return(result);
}
#if !defined(PCR) && !defined(SMALL_CONFIG)
/* Print (or display) a message before abnormal exit (including */
/* abort). Invoked from ABORT(msg) macro (there msg is non-NULL) */
/* and from EXIT() macro (msg is NULL in that case). */
STATIC void GC_CALLBACK GC_default_on_abort(const char *msg)
{
GC_find_leak = FALSE; /* disable at-exit GC_gcollect() */
if (msg != NULL) {
# if defined(MSWIN32)
# ifndef DONT_USE_USER32_DLL
/* Use static binding to "user32.dll". */
(void)MessageBoxA(NULL, msg, "Fatal error in GC",
MB_ICONERROR | MB_OK);
# else
/* This simplifies linking - resolve "MessageBoxA" at run-time. */
HINSTANCE hU32 = LoadLibrary(TEXT("user32.dll"));
if (hU32) {
FARPROC pfn = GetProcAddress(hU32, "MessageBoxA");
if (pfn)
(void)(*(int (WINAPI *)(HWND, LPCSTR, LPCSTR, UINT))pfn)(
NULL /* hWnd */, msg, "Fatal error in GC",
MB_ICONERROR | MB_OK);
(void)FreeLibrary(hU32);
}
# endif
/* Also duplicate msg to GC log file. */
# endif
/* Avoid calling GC_err_printf() here, as GC_on_abort() could be */
/* called from it. Note 1: this is not an atomic output. */
/* Note 2: possible write errors are ignored. */
if (WRITE(GC_stderr, (void *)msg, strlen(msg)) >= 0)
(void)WRITE(GC_stderr, (void *)("\n"), 1);
}
# ifndef NO_DEBUGGING
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(;;) {
/* Empty */
}
}
# endif
}
GC_abort_func GC_on_abort = GC_default_on_abort;
GC_API void GC_CALL GC_set_abort_func(GC_abort_func fn)
{
DCL_LOCK_STATE;
GC_ASSERT(fn != 0);
LOCK();
GC_on_abort = fn;
UNLOCK();
}
GC_API GC_abort_func GC_CALL GC_get_abort_func(void)
{
GC_abort_func fn;
DCL_LOCK_STATE;
LOCK();
fn = GC_on_abort;
UNLOCK();
return fn;
}
#endif /* !SMALL_CONFIG */
GC_API void GC_CALL GC_enable(void)
{
DCL_LOCK_STATE;
LOCK();
GC_dont_gc--;
UNLOCK();
}
GC_API void GC_CALL GC_disable(void)
{
DCL_LOCK_STATE;
LOCK();
GC_dont_gc++;
UNLOCK();
}
GC_API int GC_CALL GC_is_disabled(void)
{
return GC_dont_gc != 0;
}
/* Helper procedures for new kind creation. */
GC_API void ** GC_CALL GC_new_free_list_inner(void)
{
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;
}
GC_API void ** GC_CALL GC_new_free_list(void)
{
void *result;
DCL_LOCK_STATE;
LOCK();
result = GC_new_free_list_inner();
UNLOCK();
return result;
}
GC_API unsigned GC_CALL 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;
# ifdef ENABLE_DISCLAIM
GC_obj_kinds[result].ok_mark_unconditionally = FALSE;
GC_obj_kinds[result].ok_disclaim_proc = 0;
# endif
return result;
}
GC_API unsigned GC_CALL GC_new_kind(void **fl, GC_word descr, int adjust,
int clear)
{
unsigned result;
DCL_LOCK_STATE;
LOCK();
result = GC_new_kind_inner(fl, descr, adjust, clear);
UNLOCK();
return result;
}
GC_API unsigned GC_CALL 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;
}
GC_API unsigned GC_CALL GC_new_proc(GC_mark_proc proc)
{
unsigned result;
DCL_LOCK_STATE;
LOCK();
result = GC_new_proc_inner(proc);
UNLOCK();
return result;
}
GC_API void * GC_CALL GC_call_with_alloc_lock(GC_fn_type fn, void *client_data)
{
void * result;
DCL_LOCK_STATE;
# ifdef THREADS
LOCK();
/* FIXME - This looks wrong!! */
SET_LOCK_HOLDER();
# endif
result = (*fn)(client_data);
# ifdef THREADS
# ifndef GC_ASSERTIONS
UNSET_LOCK_HOLDER();
# endif /* o.w. UNLOCK() does it implicitly */
UNLOCK();
# endif
return(result);
}
GC_API void * GC_CALL GC_call_with_stack_base(GC_stack_base_func fn, void *arg)
{
struct GC_stack_base base;
void *result;
base.mem_base = (void *)&base;
# ifdef IA64
base.reg_base = (void *)GC_save_regs_in_stack();
/* Unnecessarily flushes register stack, */
/* but that probably doesn't hurt. */
# endif
result = fn(&base, arg);
/* Strongly discourage the compiler from treating the above */
/* as a tail call. */
GC_noop1((word)(&base));
return result;
}
#ifndef THREADS
GC_INNER ptr_t GC_blocked_sp = NULL;
/* NULL value means we are not inside GC_do_blocking() call. */
# ifdef IA64
STATIC ptr_t GC_blocked_register_sp = NULL;
# endif
GC_INNER struct GC_traced_stack_sect_s *GC_traced_stack_sect = NULL;
/* This is nearly the same as in win32_threads.c */
GC_API void * GC_CALL GC_call_with_gc_active(GC_fn_type fn,
void * client_data)
{
struct GC_traced_stack_sect_s stacksect;
GC_ASSERT(GC_is_initialized);
/* Adjust our stack base value (this could happen if */
/* GC_get_main_stack_base() is unimplemented or broken for */
/* the platform). */
if ((word)GC_stackbottom HOTTER_THAN (word)(&stacksect))
GC_stackbottom = (ptr_t)(&stacksect);
if (GC_blocked_sp == NULL) {
/* We are not inside GC_do_blocking() - do nothing more. */
return fn(client_data);
}
/* Setup new "stack section". */
stacksect.saved_stack_ptr = GC_blocked_sp;
# ifdef IA64
/* This is the same as in GC_call_with_stack_base(). */
stacksect.backing_store_end = GC_save_regs_in_stack();
/* Unnecessarily flushes register stack, */
/* but that probably doesn't hurt. */
stacksect.saved_backing_store_ptr = GC_blocked_register_sp;
# endif
stacksect.prev = GC_traced_stack_sect;
GC_blocked_sp = NULL;
GC_traced_stack_sect = &stacksect;
client_data = fn(client_data);
GC_ASSERT(GC_blocked_sp == NULL);
GC_ASSERT(GC_traced_stack_sect == &stacksect);
/* Restore original "stack section". */
GC_traced_stack_sect = stacksect.prev;
# ifdef IA64
GC_blocked_register_sp = stacksect.saved_backing_store_ptr;
# endif
GC_blocked_sp = stacksect.saved_stack_ptr;
return client_data; /* result */
}
/* This is nearly the same as in win32_threads.c */
STATIC void GC_do_blocking_inner(ptr_t data, void * context GC_ATTR_UNUSED)
{
struct blocking_data * d = (struct blocking_data *) data;
GC_ASSERT(GC_is_initialized);
GC_ASSERT(GC_blocked_sp == NULL);
# ifdef SPARC
GC_blocked_sp = GC_save_regs_in_stack();
# else
GC_blocked_sp = (ptr_t) &d; /* save approx. sp */
# endif
# ifdef IA64
GC_blocked_register_sp = GC_save_regs_in_stack();
# endif
d -> client_data = (d -> fn)(d -> client_data);
# ifdef SPARC
GC_ASSERT(GC_blocked_sp != NULL);
# else
GC_ASSERT(GC_blocked_sp == (ptr_t) &d);
# endif
GC_blocked_sp = NULL;
}
#endif /* !THREADS */
/* Wrapper for functions that are likely to block (or, at least, do not */
/* allocate garbage collected memory and/or manipulate pointers to the */
/* garbage collected heap) for an appreciable length of time. */
/* In the single threaded case, GC_do_blocking() (together */
/* with GC_call_with_gc_active()) might be used to make stack scanning */
/* more precise (i.e. scan only stack frames of functions that allocate */
/* garbage collected memory and/or manipulate pointers to the garbage */
/* collected heap). */
GC_API void * GC_CALL GC_do_blocking(GC_fn_type fn, void * client_data)
{
struct blocking_data my_data;
my_data.fn = fn;
my_data.client_data = client_data;
GC_with_callee_saves_pushed(GC_do_blocking_inner, (ptr_t)(&my_data));
return my_data.client_data; /* result */
}
#if !defined(NO_DEBUGGING)
GC_API void GC_CALL GC_dump(void)
{
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();
}
#endif /* !NO_DEBUGGING */
/* Getter functions for the public Read-only variables. */
/* GC_get_gc_no() is unsynchronized and should be typically called */
/* inside the context of GC_call_with_alloc_lock() to prevent data */
/* races (on multiprocessors). */
GC_API GC_word GC_CALL GC_get_gc_no(void)
{
return GC_gc_no;
}
#ifdef THREADS
GC_API int GC_CALL GC_get_parallel(void)
{
/* GC_parallel is initialized at start-up. */
return GC_parallel;
}
#endif
/* Setter and getter functions for the public R/W function variables. */
/* These functions are synchronized (like GC_set_warn_proc() and */
/* GC_get_warn_proc()). */
GC_API void GC_CALL GC_set_oom_fn(GC_oom_func fn)
{
GC_ASSERT(fn != 0);
DCL_LOCK_STATE;
LOCK();
GC_oom_fn = fn;
UNLOCK();
}
GC_API GC_oom_func GC_CALL GC_get_oom_fn(void)
{
GC_oom_func fn;
DCL_LOCK_STATE;
LOCK();
fn = GC_oom_fn;
UNLOCK();
return fn;
}
GC_API void GC_CALL GC_set_on_heap_resize(GC_on_heap_resize_proc fn)
{
/* fn may be 0 (means no event notifier). */
DCL_LOCK_STATE;
LOCK();
GC_on_heap_resize = fn;
UNLOCK();
}
GC_API GC_on_heap_resize_proc GC_CALL GC_get_on_heap_resize(void)
{
GC_on_heap_resize_proc fn;
DCL_LOCK_STATE;
LOCK();
fn = GC_on_heap_resize;
UNLOCK();
return fn;
}
GC_API void GC_CALL GC_set_finalizer_notifier(GC_finalizer_notifier_proc fn)
{
/* fn may be 0 (means no finalizer notifier). */
DCL_LOCK_STATE;
LOCK();
GC_finalizer_notifier = fn;
UNLOCK();
}
GC_API GC_finalizer_notifier_proc GC_CALL GC_get_finalizer_notifier(void)
{
GC_finalizer_notifier_proc fn;
DCL_LOCK_STATE;
LOCK();
fn = GC_finalizer_notifier;
UNLOCK();
return fn;
}
/* Setter and getter functions for the public numeric R/W variables. */
/* It is safe to call these functions even before GC_INIT(). */
/* These functions are unsynchronized and should be typically called */
/* inside the context of GC_call_with_alloc_lock() (if called after */
/* GC_INIT()) to prevent data races (unless it is guaranteed the */
/* collector is not multi-threaded at that execution point). */
GC_API void GC_CALL GC_set_find_leak(int value)
{
/* value is of boolean type. */
GC_find_leak = value;
}
GC_API int GC_CALL GC_get_find_leak(void)
{
return GC_find_leak;
}
GC_API void GC_CALL GC_set_all_interior_pointers(int value)
{
DCL_LOCK_STATE;
GC_all_interior_pointers = value ? 1 : 0;
if (GC_is_initialized) {
/* It is not recommended to change GC_all_interior_pointers value */
/* after GC is initialized but it seems GC could work correctly */
/* even after switching the mode. */
LOCK();
GC_initialize_offsets(); /* NOTE: this resets manual offsets as well */
if (!GC_all_interior_pointers)
GC_bl_init_no_interiors();
UNLOCK();
}
}
GC_API int GC_CALL GC_get_all_interior_pointers(void)
{
return GC_all_interior_pointers;
}
GC_API void GC_CALL GC_set_finalize_on_demand(int value)
{
GC_ASSERT(value != -1);
/* value is of boolean type. */
GC_finalize_on_demand = value;
}
GC_API int GC_CALL GC_get_finalize_on_demand(void)
{
return GC_finalize_on_demand;
}
GC_API void GC_CALL GC_set_java_finalization(int value)
{
GC_ASSERT(value != -1);
/* value is of boolean type. */
GC_java_finalization = value;
}
GC_API int GC_CALL GC_get_java_finalization(void)
{
return GC_java_finalization;
}
GC_API void GC_CALL GC_set_dont_expand(int value)
{
GC_ASSERT(value != -1);
/* value is of boolean type. */
GC_dont_expand = value;
}
GC_API int GC_CALL GC_get_dont_expand(void)
{
return GC_dont_expand;
}
GC_API void GC_CALL GC_set_no_dls(int value)
{
GC_ASSERT(value != -1);
/* value is of boolean type. */
GC_no_dls = value;
}
GC_API int GC_CALL GC_get_no_dls(void)
{
return GC_no_dls;
}
GC_API void GC_CALL GC_set_non_gc_bytes(GC_word value)
{
GC_non_gc_bytes = value;
}
GC_API GC_word GC_CALL GC_get_non_gc_bytes(void)
{
return GC_non_gc_bytes;
}
GC_API void GC_CALL GC_set_free_space_divisor(GC_word value)
{
GC_ASSERT(value > 0);
GC_free_space_divisor = value;
}
GC_API GC_word GC_CALL GC_get_free_space_divisor(void)
{
return GC_free_space_divisor;
}
GC_API void GC_CALL GC_set_max_retries(GC_word value)
{
GC_ASSERT(value != ~(GC_word)0);
GC_max_retries = value;
}
GC_API GC_word GC_CALL GC_get_max_retries(void)
{
return GC_max_retries;
}
GC_API void GC_CALL GC_set_dont_precollect(int value)
{
GC_ASSERT(value != -1);
/* value is of boolean type. */
GC_dont_precollect = value;
}
GC_API int GC_CALL GC_get_dont_precollect(void)
{
return GC_dont_precollect;
}
GC_API void GC_CALL GC_set_full_freq(int value)
{
GC_ASSERT(value >= 0);
GC_full_freq = value;
}
GC_API int GC_CALL GC_get_full_freq(void)
{
return GC_full_freq;
}
GC_API void GC_CALL GC_set_time_limit(unsigned long value)
{
GC_ASSERT(value != (unsigned long)-1L);
GC_time_limit = value;
}
GC_API unsigned long GC_CALL GC_get_time_limit(void)
{
return GC_time_limit;
}
GC_API void GC_CALL GC_set_force_unmap_on_gcollect(int value)
{
GC_force_unmap_on_gcollect = (GC_bool)value;
}
GC_API int GC_CALL GC_get_force_unmap_on_gcollect(void)
{
return (int)GC_force_unmap_on_gcollect;
}
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