Fix 'address of fudged_set is used out of scope' code defect (sigmask)
(fix commit 81d04a6)

* pthread_support.c [!GC_NO_PTHREAD_SIGMASK] (pthread_sigmask): Move
fudged_set to the outer scope where REAL_FUNC(pthread_sigmask) is
called (a pointer to fudged_set could be passed to the latter function).

Eliminate 'unsafe vsprintf is deprecated' compiler warning

Replacement of vsprintf to vsnprintf (or similar) if available.

Note that no buffer overflow occurs in CORD_vsprintf as buf is
allocated dynamically based on format string.

* cord/cordprnt.c (GC_VSNPRINTF): New macro (the definition is copied
from misc.c).
* cord/cordprnt.c (CORD_vsprintf): Replace vsprintf(buf,...) call with
GC_VSNPRINTF(buf,max_size+1,...).

Eliminate 'possible integer underflow' code defect (cord-de)

* cord/tests/de.c (generic_init): Replace initial==CORD_EMPTY check
with 0==len where len is CORD_len(initial) (to outline that len-1
cannot cause underflow).

Eliminate 'comparison of signed and unsigned int' GCC warning (test_cpp)
(fix commit 1868a90)

* tests/test_cpp.cc [LINT2] (main): Cast unsigned immediate value to
int (before comparison to n local variable).

Workaround 'pos_*, [r]iter, dump never used' cppcheck style warnings (cord)

* cord/tests/cordtest.c [CPPCHECK] (CORD_iter, CORD_next,
CORD_pos_fetch, CORD_pos_to_cord, CORD_pos_to_index, CORD_pos_valid,
CORD_prev): Undefine (at the beginning of the file).
* cord/tests/cordtest.c [CPPCHECK] (test_basics): Call CORD_pos_to_cord,
CORD_pos_to_index, CORD_iter, CORD_riter, CORD_dump; add TODO item.

Eliminate 'CORD_*printf is never used' cppcheck style warnings (cordtest)

Minimal testing of CORD_[v][f]printf is added to cordtest.

* cord/tests/cordtest.c: Include stdarg.h.
* cord/tests/cordtest.c: Reformat the comment describing cordtest.
* cord/tests/cordtest.c (wrap_vprintf, wrap_vfprintf): New function
(calling CORD_v[f]printf).
* cord/tests/cordtest.c (test_printf): Call CORD_printf, wrap_vfprintf,
wrap_vprintf for CORD_EMPTY (with the output to stdout); add TODO item.

Fix conditional expression in pos_fetch, next non-macro definitions (cord)

* cord/cordbscs.c (CORD_pos_fetch, CORD_next): Match the conditional
expression of the macro definition (of the same name) in cord_pos.h.

Workaround 'possible null pointer dereference' cppcheck warning (Darwin)

* darwin_stop_world.c [CPPCHECK] (GC_stack_range_for): Call ABORT if
p is NULL and thread_blocked is true.

Fix null dereference in GC_stack_range_for if not DARWIN_DONT_PARSE_STACK
(fix commit 4ceae609)

* darwin_stop_world.c (GC_stack_range_for): Use GC_ATTR_UNUSED for
paltstack_hi argument (because the latter is not used currently if
!DARWIN_DONT_PARSE_STACK); do not access p->altstack[_size] unless
DARWIN_DONT_PARSE_STACK; add TODO item.
* darwin_stop_world.c [!DARWIN_DONT_PARSE_STACK] (GC_push_all_stacks):
Do not use altstack_hi and altstack_lo; add TODO item.

Eliminate unreachable PROC/DEFAULT_VDB GC_printf calls in gctest main()

* tests/test.c [!GC_WIN32_THREADS && !GC_PTHREADS && !NO_INCREMENTAL
&& (MPROTECT_VDB || PROC_VDB || GWW_VDB) && !MAKE_BACK_GRAPH &&] (main):
Remove unreachable GC_printf call about DEFAULT_VDB; remove extra check
of GWW_VDB case.
* tests/test.c [GC_PTHREADS && MPROTECT_VDB && !REDIRECT_MALLOC
&& !MAKE_BACK_GRAPH && !USE_PROC_FOR_LIBRARIES && !NO_INCREMENTAL]
(main): Remove extra check of MPROTECT_VDB case; remove unreachable
GC_printf calls about PROC_VDB and DEFAULT_VDB.

Eliminate 'suspicious pointer subtraction' cppcheck warning (gc_cpp)

* include/gc_cpp.h (gc_cleanup::gc_cleanup): Define this_ptr void
pointer; use this_ptr instead of this keyword to outline that the
pointer subtraction is intentional (i.e., "this->" was not intended).

Revert "Workaround 'suspicious ptr subtraction' cppcheck warning in gc_cpp"

This reverts commit 363890b2ab8365dcc6b87a2a6c4752c1f710dcf2.

Because the warning is still reported by the recent versions of
cppcheck (as of Oct 2016).

Eliminate 'dereference of null' CSA false warning in array_mark_proc

The exact warning message is: Access to field 'mse_start' results in a
dereference of a null pointer (loaded from variable 'new_mark_stack_ptr').

Note: the warning is eliminated regardless of assertion checking status.

* typd_mlc.c (GC_array_mark_proc): Call ABORT if mark_stack_ptr is NULL
(thus orig_mark_stack_ptr is ensured to be non-NULL after the check).

Revert "Eliminate CSA false warning about null deref in array_mark_proc"

This reverts commit fc339c65ad0fffc2e5bc8332bab9c1c70329c04e.

Because that commit does not eliminate CSA false warning
if GC_ASSERTIONS is off.

Eliminate 'Condition 0==datastart always false' cppcheck warning (dyn_load)

* dyn_load.c [HAVE_DL_ITERATE_PHDR]
(GC_register_dynamic_libraries_dl_iterate_phdr): Cast datastart to
char*volatile* before dereferencing and checking against NULL.

Workaround 'condition is always false' cppcheck warning in get_next_stack

* win32_threads.c [CPPCHECK] (GC_get_next_stack): Set thread a non-null
value (near current_min assignment) even if GC_win32_dll_threads (to
avoid cppcheck complain that if(thread!=0) is always false (thus
UNPROTECT_THREAD(thread) is never reached) if GC_DISCOVER_TASK_THREADS.

Workaround 'value of macro unknown' cppcheck info messages

The messages are eliminated for the macros: __int64, _SIGRTMIN,
ARM_THREAD_STATE32, ARM_UNIFIED_THREAD_STATE, FIXUP_POINTER,
GC_COLLECT_AT_MALLOC, GC_FREE_SPACE_DIVISOR, GC_FULL_FREQ,
GC_INITIAL_HEAP_SIZE, GC_MAX_RETRIES, GC_MAXIMUM_HEAP_SIZE,
GC_MIN_MARKERS, GC_SIG_SUSPEND, GC_SIG_THR_RESTART, GC_TIME_LIMIT,
HEURISTIC2_LIMIT, MAP_ANONYMOUS, RTLD_DI_LINKMAP, SAVE_CALL_COUNT,
SIZE_MAX.

* alloc.c (GC_full_freq, GC_free_space_divisor, GC_time_limit): Define
to default immediate value if CPPCHECK.
* darwin_stop_world.c [ARM32 && ARM_THREAD_STATE32]
(GC_ARM_UNIFIED_THREAD_STATE): New macro (defined to
ARM_UNIFIED_THREAD_STATE unless CPPCHECK).
* darwin_stop_world.c [ARM32 && ARM_THREAD_STATE32]
(GC_stack_range_for): Use GC_ARM_UNIFIED_THREAD_STATE; do not use value
of ARM_THREAD_STATE32 if CPPCHECK.
* dyn_load.c [!USE_PROC_FOR_LIBRARIES] (GC_RTLD_DI_LINKMAP): New macro
(defined to RTLD_DI_LINKMAP unless CPPCHECK).
* dyn_load.c [!USE_PROC_FOR_LIBRARIES] (GC_FirstDLOpenedLinkMap): Use
GC_RTLD_DI_LINKMAP.
* include/gc.h (GC_word, GC_signed_word): Do not define to __int64 if
CPPCHECK.
* include/gc.h (GC_INIT_CONF_MAX_RETRIES,
GC_INIT_CONF_FREE_SPACE_DIVISOR, GC_INIT_CONF_FULL_FREQ,
GC_INIT_CONF_TIME_LIMIT, GC_INIT_CONF_SUSPEND_SIGNAL,
GC_INIT_CONF_THR_RESTART_SIGNAL, GC_MAXIMUM_HEAP_SIZE,
GC_INITIAL_HEAP_SIZE): Define to empty if CPPCHECK.
* include/private/gc_priv.h [SIZE_MAX] (GC_SIZE_MAX): Do not define to
SIZE_MAX if CPPCHECK.
* include/private/gc_priv.h [DARWIN && ARM32
&& ARM_UNIFIED_THREAD_STATE] (GC_MACH_THREAD_STATE): Do not define to
ARM_UNIFIED_THREAD_STATE if CPPCHECK.
* include/private/gc_priv.h [GC_PTHREADS && _SIGRTMIN] (SIG_SUSPEND):
Do not define to _SIGRTMIN if CPPCHECK.
* pthread_stop_world.c [!SIG_THR_RESTART && _SIGRTMIN]
(SIG_THR_RESTART): Likewise.
* include/private/gcconfig.h [SAVE_CALL_CHAIN && SAVE_CALL_COUNT]
(NFRAMES): Define to immediate value (do not use value of
SAVE_CALL_COUNT) if CPPCHECK.
* include/private/gcconfig.h [!FIXUP_POINTER && POINTER_MASK]
(FIXUP_POINTER): Define to a sample expression (not using values of
POINTER_MASK and POINTER_SHIFT) if CPPCHECK.
* malloc.c [GC_COLLECT_AT_MALLOC] (GC_dbg_collect_at_malloc_min_lb):
Define to sample value (not using value of GC_COLLECT_AT_MALLOC) if
CPPCHECK.
* misc.c [GC_INITIAL_HEAP_SIZE] (GC_init): Define to default immediate
value if CPPCHECK.
* os_dep.c [!BEOS && !OS2 && !SWIN32 && !GC_OPENBSD_THREADS
&& !STACKBOTTOM && HEURISTIC2_LIMIT] (GC_get_main_stack_base): Do not
use value of HEURISTIC2_LIMIT if CPPCHECK.
* os_dep.c [USE_MMAP_ANON && MAP_ANONYMOUS] (OPT_MAP_ANON): Do not use
value of MAP_ANONYMOUS if CPPCHECK.
* pthread_stop_world.c [GC_ENABLE_SUSPEND_THREAD && !GC_TIME_LIMIT]
(GC_TIME_LIMIT): Do not define.
* pthread_stop_world.c [GC_ENABLE_SUSPEND_THREAD]
(GC_brief_async_signal_safe_sleep): Do not use value of GC_TIME_LIMIT
if CPPCHECK.
* pthread_support.c [PARALLEL_MARK && GC_MIN_MARKERS] (GC_thr_init):
Do not use value of GC_MIN_MARKERS if CPPCHECK.
* win32_threads.c [PARALLEL_MARK && GC_MIN_MARKERS] (GC_thr_init):
Likewise.
* tests/test.c [GC_DEBUG && SAVE_CALL_CHAIN && SAVE_CALL_COUNT]
(check_heap_stats): Use NFRAMES instead of SAVE_CALL_COUNT (i.e. do not
use value of SAVE_CALL_COUNT).

Workaround 'value of REDIRECT_MALLOC/FREE unknown' cppcheck info messages

* malloc.c [REDIRECT_MALLOC && !REDIRECT_MALLOC_IN_HEADER]
(REDIRECT_MALLOC_F): New macro (defined to REDIRECT_MALLOC unless
CPPCHECK).
* malloc.c [REDIRECT_MALLOC && !REDIRECT_MALLOC_IN_HEADER] (malloc,
calloc, strdup, strndup): Use REDIRECT_MALLOC_F instead of
REDIRECT_MALLOC.
* malloc.c [REDIRECT_FREE && !REDIRECT_MALLOC_IN_HEADER]
(REDIRECT_FREE_F): New macro (defined to REDIRECT_FREE unless
CPPCHECK).
* malloc.c [REDIRECT_FREE && !REDIRECT_MALLOC_IN_HEADER] (free): Use
REDIRECT_FREE_F instead of REDIRECT_FREE.

Workaround 'value of WINAPI unknown' cppcheck info messages

* include/gc.h [GC_WIN32_THREADS && WINAPI && !CPPCHECK]
(GC_WINDOWS_H_INCLUDED): New macro.
* include/gc.h [GC_WIN32_THREADS] (GC_WINDOWS_H_INCLUDED): Define also
if windows.h included.
* include/gc.h [GC_WIN32_THREADS]: Replace "#ifdef WINAPI" with
"#ifdef GC_WINDOWS_H_INCLUDED".

Workaround 'value of SIGBUS unknown' cppcheck info messages

* include/private/gcconfig.h [SIGBUS && !CPPCHECK] (HAVE_SIGBUS): New
macro.
* os_dep.c [NEED_FIND_LIMIT || UNIX_LIKE] (old_bus_handler,
GC_set_and_save_fault_handler, GC_reset_fault_handler): Replace
"ifdef SIGBUS" with "ifdef HAVE_SIGBUS".
* pthread_stop_world.c [!GC_OPENBSD_UTHREADS && !NACL]
(GC_remove_allowed_signals): Likewise.

Eliminate 'value of DATASTART2 unknown' cppcheck info messages

* dyn_load.c [HAVE_DL_ITERATE_PHDR]
(GC_register_dynamic_libraries_dl_iterate_phdr): Replace
defined(DATASTART2) with defined(GC_HAVE_DATAREGION2).
* os_dep.c [!OS2 && !MSWIN32 && !OPENBSD] (GC_register_data_segments):
Likewise.
* include/private/gcconfig.h [DATASTART2] (GC_HAVE_DATAREGION2): New
macro.

Eliminate 'value of GC_PTHREAD_EXIT_ATTRIBUTE unknown' cppcheck messages

* include/gc_config_macros.h [GC_PTHREAD_EXIT_ATTRIBUTE]
(GC_HAVE_PTHREAD_EXIT): New macro.
* include/gc_config_macros.h: Replace defined(GC_PTHREAD_EXIT_ATTRIBUTE)
with defined(GC_HAVE_PTHREAD_EXIT).
* include/gc_pthread_redirects.h: Likewise.
* pthread_support.c: Likewise.

Eliminate 'value of GC_RETURN_ADDR_PARENT unknown' cppcheck info messages

* dbg_mlc.c [GC_ADD_CALLER]: Replace defined(GC_RETURN_ADDR_PARENT)
with defined(GC_HAVE_RETURN_ADDR_PARENT).
* include/private/gc_priv.h (GC_DBG_EXTRAS): Likewise.
* include/gc_config_macros.h [GC_RETURN_ADDR_PARENT]
(GC_HAVE_RETURN_ADDR_PARENT): New macro.

Eliminate 'value of CLOCK_TYPE unknown' cppcheck info message

* tests/disclaim_bench.c (main): Replace #ifdef CLOCK_TYPE
with #ifndef NO_CLOCK.

Fix 'ISO C90 does not support %lf, %lg gnu_printf formats' GCC warnings

* tests/disclaim_bench.c (main): Replace "%lf" printf format specifier
to "%f" one, and "%lg" one to "%g" one.

Workaround 'tainted int used as loop bound' static analysis tool warning

No need to check upper bound of n here, so a dummy check is added.

* tests/test_cpp.cc (main) [LINT2]: Check upper bound of n local
variable (the check is actually dummy).
* tests/test_cpp.cc (main): Reformat code (which handles n variable).

Eliminate 'value of NEED_FIXUP_POINTER unknown' cppcheck info messages

* include/private/gc_pmark.h: Replace #if NEED_FIXUP_POINTER
to #ifdef NEED_FIXUP_POINTER.
* include/private/gcconfig.h (NEED_FIXUP_POINTER): If FIXUP_POINTER
then define to empty else leave undefined.
* mark.c (GC_push_all_stack): Replace if(!NEED_FIXUP_POINTER)
to #ifndef NEED_FIXUP_POINTER.
* mark_rts.c (GC_push_all_stack_partially_eager): Likewise.

Fix 'ISO C90 forbids mixed declarations and code' compiler warning

* pthread_support.c [GC_PTHREADS && !GC_WIN32_THREADS]
(GC_thread_exit_proc): Move GC_log_printf() call down to be after local
variables declarations.
* thread_local_alloc.c [THREAD_LOCAL_ALLOC && USE_PTHREAD_SPECIFIC
&& !USE_WIN32_SPECIFIC]: Add {} to have "k" local variable declaration
before any statement in a block.

Eliminate 'ISO C forbids an empty translation unit' GCC pedantic warning

"extern int GC_quiet" is added to suppress compiler warning.

* extra/msvc_dbg.c [_M_AMD64 || !_MSC_VER] (GC_quiet): Declare external
variable.

Eliminate 'printf format specifies type void*' GCC pedantic warnings

Explicitly cast pointer arguments (passed to printf and ABORT_ARGn) to
void* to match %p format specifier.

* allchblk.c [!NO_DEBUGGING] (GC_dump_regions): Cast arguments to
void* those printf format specifier is %p.
* alloc.c [!NO_DEBUGGING] (GC_print_heap_sects): Likewise.
* backgraph.c [MAKE_BACK_GRAPH] (backwards_height): Likewise.
* blacklst.c (GC_default_print_heap_obj_proc): Likewise.
* blacklst.c [PRINT_BLACK_LIST] (GC_print_blacklisted_ptr): Likewise.
* cord/cordbscs.c (CORD_dump_inner): Likewise.
* darwin_stop_world.c [DEBUG_THREADS_EXTRA] (GC_FindTopOfStack):
Likewise.
* darwin_stop_world.c [DEBUG_THREADS] (GC_stack_range_for): Likewise.
* dbg_mlc.c (GC_print_obj): Likewise.
* dbg_mlc.c [!SHORT_DBG_HDRS] (GC_print_smashed_obj): Likewise.
* dyn_load.c [HAVE_DL_ITERATE_PHDR]
(GC_register_dynamic_libraries_dl_iterate_phdr): Likewise.
* dyn_load.c [IRIX5] (GC_register_dynamic_libraries): Likewise.
* finalize.c [!NO_DEBUGGING] (GC_dump_finalization_links,
GC_dump_finalization): Likewise.
* include/private/gc_pmark.h [MARK_BIT_PER_GRANULE || MARK_BIT_PER_OBJ]
(PUSH_CONTENTS_HDR): Likewise.
* mark.c [ENABLE_TRACE] (GC_mark_from): Likewise.
* mark_rts.c [!NO_DEBUGGING] (GC_print_static_roots): Likewise.
* mark_rts.c [DEBUG_ADD_DEL_ROOTS] (GC_add_roots_inner,
GC_remove_root_at_pos): Likewise.
* misc.c [ENABLE_TRACE] (GC_init): Likewise.
* os_dep.c [LINUX || HURD] (GC_init_linux_data_start): Likewise.
* os_dep.c [!OS2 && !MSWIN32] (GC_register_data_segments): Likewise.
* os_dep.c [USE_MUNMAP && !USE_WINALLOC && !NACL] (GC_remap): Likewise.
* os_dep.c [!DARWIN && !MSWIN32 && !MSWINCE] (GC_write_fault_handler):
Likewise.
* os_dep.c [PROC_VDB && DEBUG_DIRTY_BITS] (GC_read_dirty): Likewise.
* os_dep.c [MPROTECT_VDB && DARWIN && BROKEN_EXCEPTION_HANDLING]
(catch_exception_raise): Likewise.
* pthread_stop_world.c [DEBUG_THREADS] (GC_push_all_stacks): Likewise.
* pthread_support.c [DEBUG_THREADS] (GC_unregister_my_thread_inner,
GC_unregister_my_thread, GC_start_rtn_prepare_thread): Likewise.
* reclaim.c [!NO_DEBUGGING] (GC_print_free_list): Likewise.
* specific.c [USE_CUSTOM_SPECIFIC && GC_ASSERTIONS]
(GC_check_tsd_marks): Likewise.
* win32_threads.c [DEBUG_THREADS] (GC_push_stack_for): Likewise.
* win32_threads.c [GC_PTHREADS && DEBUG_THREADS] (GC_pthread_join,
GC_pthread_create, GC_pthread_start_inner, GC_thread_exit_proc):
Likewise.
* dbg_mlc.c: Remove duplicate check of SHORT_DBG_HDRS.
* include/private/gc_pmark.h [MARK_BIT_PER_GRANULE || MARK_BIT_PER_OBJ]
(PUSH_CONTENTS_HDR): Add missing parentheses around "source" argument
when casting it to ptr_t.

Eliminate 'scope of variable can be reduced' warning in write_fault_handler

* os_dep.c [!DARWIN] (GC_write_fault_handler): Move "i" local variable
declaration to the inner scope where the variable is actually used.

Fix local variable declarations in disclaim_bench

* tests/disclaim_bench.c (main): Place (move) tI, tF local variable
declarations (in the block) before any statement.

Fix 'variable unused' compiler warning in FirstDLOpenedLinkMap

* dyn_load.c [!USE_PROC_FOR_LIBRARIES] (GC_FirstDLOpenedLinkMap):
Declare dp local variable only if !NETBSD or !RTLD_DI_LINKMAP.

Workaround 'variable reassigned before old value used' cppcheck warnings

* misc.c (GC_call_with_gc_active): Call GC_noop1 for
GC_traced_stack_sect and GC_blocked_sp (before restoring their original
values) if CPPCHECK.
* win32_threads.c (GC_do_blocking_inner): Call GC_noop1 for
thread_blocked_sp field (before restoring its original value)
if CPPCHECK.
* win32_threads.c (GC_call_with_gc_active): Call GC_noop1 for
traced_stack_sect field (before restoring its original value)
if CPPCHECK.

Workaround 'same expression on both sides of ==' cppcheck style warning

* misc.c (GC_init): Do not check sizeof(signed_word) value if CPPCHECK.

Workaround 'same expression on both sides of OR' cppcheck style warning

* os_dep.c [USE_WINALLOC || CYGWIN32] (GC_mem_top_down): Define to
non-zero value (MEM_TOP_DOWN) if CPPCHECK.

Workaround 'variable hides enumerator with same name' cppcheck warnings

* include/new_gc_alloc.h (GC_bytes_per_word, GC_word_alignment): Define
as const unsigned (instead of single-item enum) if CPPCHECK.

Workaround 'redundant assignment of *result to itself' cppcheck warning

* os_dep.c [DGUX || LINUX && SPARC] (GC_SysVGetDataStart): Call
GC_noop1(&v) if CPPCHECK where v = *result.

Workaround 'obsolete function alloca() called' cppcheck warnings

* dyn_load.c [AIX] (GC_register_dynamic_libraries): Code refactoring
to have alloca() call only once (at the beginning of a block); use
variable-length array instead of alloca() if CPPCHECK.

Workaround 'possible null pointer dereference' cppcheck warnings

* include/private/gc_priv.h (GC_on_abort): Move definition upper (to be
before ABORT definition); define it to empty if PCR (this is needed for
CPPCHECK).
* include/private/gc_priv.h (ABORT): Specially define to
{GC_on_abort(msg);abort();} block statement if CPPCHECK.
* tests/test.c (chktree): Check for n is zero only once; add comment.

Workaround 'Condition 0!=GETENV() is always false' cppcheck style warnings

* include/private/gc_priv.h [NO_GETENV] (GETENV): Do not define to NULL
if CPPCHECK.

Eliminate 'constructor with 1 argument is not explicit' warnings in test_cpp
(fix commit 569fd66)

* tests/test_cpp.cc (GC_ATTR_EXPLICIT): Define macro in the same way as
in include/gc_allocator.h.

Workaround 'Uninitialized variable' cppcheck errors

* extra/AmigaOS.c [GC_AMIGA_DS] (GC_register_data_segments): Initialize
myseglist outside conditional statement.
* mach_dep.c [GETCONTEXT_FPU_EXCMASK_BUG && X86_64]
(GC_with_callee_saves_pushed): Call GC_noop1(&old_fcw) (before asm
fstcw) if CPPCHECK.
* mach_dep.c [!HAVE_BUILTIN_UNWIND_INIT] (GC_with_callee_saves_pushed):
Replace regs with &regs.
* os_dep.c [!MSWIN32 && !GC_OPENBSD_THREADS && ...]
(GC_get_main_stack_base): Set result to NULL if CPPCHECK but none of
HEURISTIC* and *STACKBOTTOM defined.

Workaround 'passing untyped NULL to variadic function' cppcheck warning

The portability warning "Passing NULL after the last typed argument to
a variadic function leads to undefined behavior" was reported for
ABORT_ARG2(..., DATASTART, DATAEND) call in GC_register_data_segments.

* include/private/gcconfig.h [SYMBIAN || __EMSCRIPTEN__] (DATASTART,
DATAEND): Explicitly cast NULL to ptr_t.

Workaround 'struct member is never used' cppcheck style warnings

* os_dep.c [OS2] (GC_register_data_segments): Assign 0 to
hdrdos.padding, hdr386.exe_format_level/os/padding1/padding2,
seg.pagemap/mapsize/reserved fields if CPPCHECK; add comment.
* os_dep.c [MPROTECT_VDB && DARWIN] (GC_mprotect_thread): Assign 0 to
the first element of reply.data, msg.data fields if CPPCHECK; add
comment.
* typd_mlc.c (TAG): Define to ad.ad_tag (instead of ld.ld_tag).

Fix 'variable assigned a value that is never used' cppcheck style warnings

* dyn_load.c [USE_PROC_FOR_LIBRARIES] (GC_register_map_entries): Remove
datastart local variable.
* extra/AmigaOS.c [GC_AMIGA_DS] (GC_register_data_segments): Remove
num local variable.
* extra/MacOS.c (firstTime): Remove.
* extra/MacOS.c (GC_MacTemporaryNewPtr): Do not define firstTime if
SHARED_LIBRARY_BUILD.
* extra/MacOS.c (GC_MacFreeTemporaryMemory): Do not define (and update)
totalMemoryUsed if SHARED_LIBRARY_BUILD.
* extra/msvc_dbg.c (GetDescriptionFromAddress): Do not assign size
variable when its value no longer used.

Workaround 'checking if unsigned value is negative' cppcheck warning

* allchblk.c [GC_ASSERTIONS && !USE_MUNMAP] (GC_add_to_fl): Replace
(signed_word)GC_heapsize<0 with (GC_heapsize&SIGNB)!=0.

Workaround more 'void pointers in calculations' cppcheck warnings

* include/new_gc_alloc.h (single_client_gc_alloc_template::allocate,
single_client_gc_alloc_template::ptr_free_allocate,
single_client_gc_alloc_template::deallocate,
single_client_gc_alloc_template::ptr_free_deallocate,
single_client_traceable_alloc_template::allocate,
single_client_traceable_alloc_template::ptr_free_allocate,
single_client_traceable_alloc_template::deallocate,
single_client_traceable_alloc_template::ptr_free_deallocate): Replace
GC_Xobjfreelist_ptr+nwords with &GC_Xobjfreelist_ptr[nwords].
* reclaim.c (GC_start_reclaim): Replace fop++ with (*(word**)&fop)++.
* thread_local_alloc.c (return_freelists): Replace gfl+i with &gfl[i].

Workaround 'unused variable' cppcheck style warnings

* include/private/gc_locks.h [PCR && THREADS] (DCL_LOCK_STATE): Define
to empty if CPPCHECK.
* mach_dep.c [MACOS && __MWERKS__ && POWERPC] (getRegisters): Declare
as external of CPPCHECK (as cppcheck does not recognize "asm" in
function declaration).

Eliminate more 'scope of variable can be reduced' cppcheck style warnings

* allchblk.c [MARK_BIT_PER_GRANULE] (setup_header): Move local variable
declarations to the inner scope where the variables are actually used.
* alloc.c [!SMALL_CONFIG] (GC_try_to_collect_inner,
GC_finish_collection): Likewise.
* alloc.c (GC_stopped_mark): Likewise.
* backgraph.c [MAKE_BACK_GRAPH] (add_edge): Likewise.
* darwin_stop_world.c [GC_DARWIN_THREADS] (GC_push_all_stacks,
GC_stop_world, GC_thread_resume): Likewise.
* dyn_load.c [USE_PROC_FOR_LIBRARIES] (sort_heap_sects): Likewise.
* dyn_load.c [ALPHA && OSF1 || HPUX] (GC_register_dynamic_libraries):
Likewise.
* dyn_load.c [DARWIN] (GC_dyld_image_add, GC_dyld_image_remove):
Likewise.
* extra/AmigaOS.c (GC_amiga_free_all_mem, GC_amiga_allocwrapper_any):
Likewise.
* extra/msvc_dbg.c (GetDescriptionFromAddress): Likewise.
* gcj_mlc.c [GC_GCJ_SUPPORT] (GC_core_gcj_malloc,
GC_gcj_malloc_ignore_off_page): Likewise.
* include/new_gc_alloc.h (single_client_gc_alloc_template::deallocate,
single_client_gc_alloc_template::ptr_free_deallocate,
single_client_traceable_alloc_template::deallocate,
single_client_traceable_alloc_template::ptr_free_deallocate): Likewise.
* malloc.c [THREADS] (GC_free_inner): Likewise.
* mark_rts.c (GC_add_roots_inner): Likewise.
* misc.c (GC_clear_stack): Likewise.
* os_dep.c [GWW_VDB] (GC_gww_read_dirty): Likewise.
* os_dep.c [MPROTECT_VDB] (GC_protect_heap): Likewise.
* os_dep.c [PROC_VDB] (GC_read_dirty): Likewise.
* os_dep.c [MPROTECT_VDB && DARWIN] (catch_exception_raise): Likewise.
* pthread_stop_world.c [GC_NETBSD_THREADS_WORKAROUND] (GC_start_world):
Likewise.
* pthread_support.c [!GC_NO_PTHREAD_SIGMASK] (pthread_sigmask):
Likewise.
* reclaim.c [!SMALL_CONFIG] (GC_reclaim_all): Likewise.
* tests/test.c (run_one_test): Likewise.
* tests/test.c [MACOS] (SetMinimumStack): Likewise.
* thread_local_alloc.c [THREAD_LOCAL_ALLOC] (return_single_freelist):
Likewise.
* typd_mlc.c (GC_make_descriptor): Likewise.
* win32_threads.c (GC_start_world, GC_CreateThread): Likewise.
* win32_threads.c [!GC_PTHREADS_PARAMARK] (GC_start_mark_threads_inner):
Likewise.
* win32_threads.c [!MSWINCE && !CYGWIN32] (GC_beginthreadex): Likewise.

Eliminate 'printf format specifier mismatch' compiler warning (tools)

* tools/setjmp_t.c (main): Use %lu (instead of %ld) printf format
specifier for unsigned long value.

Fix typo in CHECK_GCLIB_VERSION name (test)

* tests/test.c (CHECK_GCLIB_VERSION): Fix typo in macro name.

Workaround 'resource leak' error reported by cppcheck (tools, test)

* tests/test.c [GC_GCJ_SUPPORT && TEST_WITH_SYSTEM_MALLOC] (reverse):
Call GC_noop1 for malloc() result.
* tools/if_not_there.c (main): Move "f" local variable assignments
outside conditional expression.

Eliminate 'unnecessary comparison of static strings' cppcheck warning

* tools/if_mach.c (main): Replace strcmp(x, "")!=0 with strlen(x)>0.

Workaround more '#error' cppcheck error messages

* darwin_stop_world.c (GC_stack_range_for): Skip #error pragma if
CPPCHECK.
* dyn_load.c [DYNAMIC_LOADING && !PCR && !DARWIN]: Likewise.
* dyn_load.c [SOLARISDL && !PCR && !GC_SOLARIS_THREADS && THREADS]:
Likewise.
* include/private/gc_priv.h [!POWERPC && !I386 && !X86_64 && !ARM32
&& !AARCH64] (GC_THREAD_STATE_T): Likewise.
* include/private/gcconfig.h [GC_IRIX_THREADS && !IRIX5 || ...]:
Likewise.
* include/private/gcconfig.h [PARALLEL_MARK && !THREADS]: Likewise.
* include/private/gcconfig.h [MARK_BIT_PER_GRANULE && MARK_BIT_PER_OBJ
|| ...]: Likewise.
* pcr_interface.c [PCR] (GC_enumerate_block): Likewise.
* win32_threads.c [!I386 && !X86_64 && !ARM32 && !SHx && !MIPS && !PPC
&& !ALPHA] (GC_push_stack_for): Likewise.
* darwin_stop_world.c (GC_stack_range_for): Initialize "lo" local
variable even if platform unsupported.

Fix 'syntax error' reported by cppcheck for mach_dep

The error is reported at line containing "asm".

* mach_dep.c [MACOS && M68K && THINK_C] (GC_push_regs): Do not define
if CPPCHECK.

Fix missing #error pragma

* dyn_load.c [DYNAMIC_LOADING && !PCR && !DARWIN]: Replace "-->" with
* dyn_load.c [SOLARISDL && !PCR && !GC_SOLARIS_THREADS && THREADS]:
Likewise.
* include/private/gc_hdrs [CPP_WORDSZ!=32 && CPP_WORDSZ<36]: Likewise.
* include/private/gc_priv.h [!HBLKSIZE]: Likewise.
* pthread_stop_world.c [!NSIG]: Likewise.

Workaround '#error' cppcheck error messages

* extra/msvc_dbg.c (GetStackFramesFromContext): Skip #error pragma
if CPPCHECK.
* include/private/gcconfig.h [sun && mc68000]: Likewise.
* include/private/gcconfig.h [hp9000s300 || ibm032 || _AUX_SOURCE
|| __pj__]: Likewise.
* include/private/gcconfig.h [!mach_type_known]: Likewise.
* include/private/gcconfig.h [HEXAGON && LINUX && !__ELF__]: Likewise.
* include/private/gcconfig.h [!ALIGNMENT || !STACKBOTTOM]: Likewise.
* os_dep.c [USE_MUNMAP && !USE_MMAP]: Likewise.
* os_dep.c [MPROTECT_VDB && DARWIN && !ARM32 && !AARCH64 && !POWERPC
&& !I386]: Likewise.

Eliminate 'scope of variable can be reduced' cppcheck warning in allchblk

* allchblk.c [USE_MUNMAP] (GC_merge_unmapped): Move local variable
declarations to the inner scope where the variables are actually used.

Eliminate 'address of local variable returned' static analyzer warning

* mark_rts.c [__GNUC__ >= 4] (GC_approx_sp): Use
__builtin_frame_address(0) instead of &sp (but still write the value to
the volatile local variable to force stack to grow if necessary).
* tools/setjmp_t.c [__GNUC__ >= 4] (nested_sp): Return
__builtin_frame_address(0) instead of sp.

Fix tools/setjmp_t to prevent nested_sp inlining

Inlined nested_sp might cause incorrect result of nested_sp()<sp.

* tools/setjmp_t.c (nested_sp): Change return from int* to word.
* tools/setjmp_t.c (nested_sp_fn): New global volatile variable
initialized to nested_sp.
* tools/setjmp_t.c (main): Use nested_sp_fn instead of nested_sp;
remove redundant cast.

Eliminate more 'scope of variable can be reduced' cppcheck style warnings

* allchblk.c (GC_compute_large_free_bytes, GC_print_hblkfreelist,
free_list_index_of, GC_dump_regions, GC_add_to_fl, GC_unmap_old,
GC_allochblk_nth): Move local variable declaration to the inner scope
where the variable is actually used.
* alloc.c (GC_maybe_gc, GC_collect_a_little_inner, GC_set_fl_marks,
GC_clear_fl_marks): Likewise.
* dyn_load.c (GC_register_dynamic_libraries): Likewise.
* finalize.c (GC_ignore_self_finalize_mark_proc,
GC_register_finalizer_inner, GC_dump_finalization_links,
GC_dump_finalization, GC_make_disappearing_links_disappear,
GC_remove_dangling_disappearing_links, GC_invoke_finalizers): Likewise.
* headers.c (GC_install_counts): Likewise.
* malloc.c (GC_malloc_kind_global, GC_generic_malloc_uncollectable,
GC_free): Likewise.
* mark.c (GC_push_all_eager, GC_push_marked1, GC_push_marked2,
GC_push_marked4): Likewise.
* mark_rts.c (GC_next_exclusion, GC_exclude_static_roots_inner,
GC_push_conditional_with_exclusions): Likewise.
* misc.c (GC_base, GC_parse_mem_size_arg, GC_write): Likewise.
* os_dep.c (GC_repeat_read, GC_get_maps, GC_least_described_address,
GC_register_root_section, GC_register_data_segments): Likewise.
* reclaim.c (GC_reclaim_block, GC_start_reclaim): Likewise.
* finalize.c (ITERATE_DL_HASHTBL_BEGIN): Declare prev_dl local variable.

Eliminate 'potential overflow' static analyzer warning in test

* tests/subthread_create.c (entry): Replace (int)(int_v1 - uint_v2)
expression with int_v1 - (int)uint_v2.

Workaround 'mmap() resource handle leak' static analyzer warning

* os_dep.c [USE_MUNMAP && LINT2] (GC_unmap, GC_remap, GC_unmap_gap):
Call GC_noop1(result) where result is returned by mmap or VirtualAlloc.
* os_dep.c [USE_MUNMAP && NACL] (GC_remap): Rename mmap_result local
variable to result.
* os_dep.c [USE_MUNMAP && !USE_WINALLOC] (GC_unmap_gap): Update
GC_unmapped_bytes (by len) only if len is non-zero.

Workaround 'local variable size too big' static analyzer warning

* mark.c [PARALLEL_MARK] (LOCAL_MARK_STACK_SIZE): Define to smaller
value if LINT2 (to avoid static analysis tool warning that
local_mark_stack local variable size is very big).

Fix potential overflow in decrement when computing GC_markers_m1

Also, call WARN if a non-positive value is specified in GC_MARKERS.

* pthread_support.c [PARALLEL_MARK] (GC_thr_init): Replace markers_m1
local variable with markers one; keep real number of markers in
"markers" variable (not a decremented one); treat invalid (i.e.
non-positive) markers value (obtained from GC_MARKERS environment
variable) the same way as too big ones (i.e. set to maximum number of
markers in this case); adjust WARN message accordingly; report invalid
or too big markers value in WARN.
* win32_threads.c [PARALLEL_MARK] (GC_thr_init): Likewise.
* pthread_support.c [PARALLEL_MARK] (GC_thr_init): Adjust code
indentation.

Fix GC_requested_heapsize increment in GC_init

Also eliminate static analyzer warning about potential overflow in
initial_heap_sz * HBLKSIZE.

* misc.c (GC_init): Change initial_heap_sz to keep size value in bytes
instead of HBLKSIZE units (thus, GC_requested_heapsize is incremented
by a number of bytes not HBLKSIZE units).

Fix printf format specifiers in extra files
(to eliminate cppcheck warnings)

* extra/MacOS.c (GC_MacFreeTemporaryMemory): Cast GC_gc_no to unsigned
long, and adjust fprintf format specifier appropriately.
* extra/msvc_dbg.c (GetDescriptionFromAddress): Cast line_number to
int when passed to wsprintf() to match format specifier.

Code refactoring of tests/subthread_create regarding AO add primitive

* tests/subthread_create.c (entry): Use AO_fetch_and_add1(&v) instead
of AO_fetch_and_add(&v,1).

Eliminate 'FP divide-by-zero' static analyzer warning

* tests/disclaim_bench.c (main): Print "N/A" (i.e. do not invoke
printf with t/(double)free_count) if free_count <= 0.

Skip thread suspend/resume API testing for Tru64 (OSF1)
(fix commit 8ff3262)

OSF1 has GC_retry_signals on by default but this is not supported by
thread suspend/resume API yet.

* tests/test.c [GC_PTHREADS && GC_ENABLE_SUSPEND_THREAD]
(fork_a_thread): Do not test GC_suspend/resume_thread if
GC_OSF1_THREADS.

Add more cases to huge_test to cover sizes close to word-type maximum

* tests/huge_test.c (GC_WORD_MAX): New macro.
* tests/huge_test.c (GC_SWORD_MAX): Use GC_WORD_MAX.
* tests/huge_test.c (main): Add GC_SWORD_MAX+1, GC_WORD_MAX,
GC_WORD_MAX-4/8/16/1024 test cases.

Eliminate 'write to memory that was const-qualified' code analyzer warning

* cord/cordbscs.c (CORD_from_fn): Rename to CORD_from_fn_inner; make it
static; change return type from CORD to CordRep*; define public
CORD_from_fn which simply calls CORD_from_fn_inner (with the type cast
to CORD).
* cord/cordbscs.c (CORD_substr_closure): Call CORD_from_fn_inner
instead of CORD_from_fn (thus remove the cast from const type to
a non-const one).

Revert "Workaround 'struct member Generic::null never used' cppcheck style warning"
(after commit cbc51ee)

This reverts commit 3fea666ef34f90b2c04095274c449b0b7978d756.

The reverted commit is not needed anymore because commit cbc51ee
adds function.null value check.

Fix CORD_substr_closure for the case when CORD_from_fn returns C string

* cord/cordbscs.c (CORD_substr_closure): Change type of "result" local
variable from CORD to CordRep* (insert necessary type casts); update
function.header only if function.null field is zero (i.e. CORD_from_fn
returned pointer to CordRep, not a pointer to C character string).

Eliminate 'comparison is always false' static analyzer warning in finalize

GC_enqueue_all_finalizers code refactoring is done (removal of the
unreachable statement) to eliminate the warning.

* finalize.c (GC_enqueue_all_finalizers): Remove "prev_fo" local
variable; remove "register" keyword for local variables;
remove the pointer to the chain of hash table entries from the roots
(i.e. setting the roots pointer to null) at the beginning of processing
the chain (instead of updating the roots pointer on deletion of each
entry and finally setting it to null); remove fo_set_next(prev_fo) as
it is never called (because prev_fo was always null); update
GC_fo_entries only when the whole table processed (i.e. all items
removed).

Eliminate 'deref-of-null' static analyzer warning in register_finalizer

* finalize.c (GC_register_finalizer_inner): Add GC_ASSERT that fn and
hhdr are non-NULL (instead of specifying this in a comment) if new_fo
is non-NULL (new_fo is returned by GC_oom_fn).

Fix 'label cannot be reached' static analyzer warning in disclaim_test

* disclaim_test.c (GROW_LIMIT): Define to MUTATE_CNT/10 (instead of
10000000), so that it is always less than MUTATE_CNT (thus
i > GROW_LIMIT is not always false, thus all switch cases are
reachable).

Fix GC_bytes_allocd incrementation in case of allocation failure

* malloc.c (GC_generic_malloc_inner,
GC_generic_malloc_inner_ignore_off_page, GC_generic_malloc): Increment
GC_bytes_allocd only if the allocation successful (op != NULL).
* mallocx.c (GC_generic_malloc_ignore_off_page): Likewise.

Code refactoring of divide-by-HBLKSIZE occurrences

* alloc.c (GC_print_heap_sects): Replace "/HBLKSIZE" with divHBLKSZ.
* blacklst.c (total_stack_black_listed): Likewise.

Code refactoring of huge_test

* tests/huge_test.c [!GC_MAXIMUM_HEAP_SIZE] (GC_MAXIMUM_HEAP_SIZE,
GC_INITIAL_HEAP_SIZE): Define (before include gc.h); move the comment
from main().
* tests/huge_test.c (CHECK_ALLOC_FAILED): New macro.
* tests/huge_test.c (main): Remove "r" local variable; do not call
GC_set_max_heap_size and GC_expand_hp explicitly (as it is done
by GC_INIT provided GC_MAXIMUM_HEAP_SIZE and GC_INITIAL_HEAP_SIZE are
defined); use CHECK_ALLOC_FAILED (instead of if/fprintf/exit).

Fix GC_collect_or_expand to prevent allocation size value wrap-around

Relates to issue #135 on Github.

* alloc.c (GC_WORD_MAX): New macro.
* alloc.c (GC_collect_or_expand): Limit blocks_to_get by
GC_WORD_MAX / HBLKSIZE value (to avoid multiplication overflow in
GC_expand_hp_inner).

Fix malloc routines to prevent size value wrap-around

See issue #135 on Github.

* allchblk.c (GC_allochblk, GC_allochblk_nth): Use
OBJ_SZ_TO_BLOCKS_CHECKED instead of OBJ_SZ_TO_BLOCKS.
* malloc.c (GC_alloc_large): Likewise.
* alloc.c (GC_expand_hp_inner): Type of "bytes" local variable changed
from word to size_t; cast ROUNDUP_PAGESIZE argument to size_t; prevent
overflow when computing GC_heapsize+bytes > GC_max_heapsize.
* dbg_mlc.c (GC_debug_malloc, GC_debug_malloc_ignore_off_page,
GC_debug_malloc_atomic_ignore_off_page, GC_debug_generic_malloc,
GC_debug_generic_malloc_inner,
GC_debug_generic_malloc_inner_ignore_off_page,
GC_debug_malloc_stubborn, GC_debug_malloc_atomic,
GC_debug_malloc_uncollectable, GC_debug_malloc_atomic_uncollectable):
Use SIZET_SAT_ADD (instead of "+" operator) to add extra bytes to lb
value.
* fnlz_mlc.c (GC_finalized_malloc): Likewise.
* gcj_mlc.c (GC_debug_gcj_malloc): Likewise.
* include/private/gc_priv.h (ROUNDUP_GRANULE_SIZE, ROUNDED_UP_GRANULES,
ADD_SLOP, ROUNDUP_PAGESIZE): Likewise.
* include/private/gcconfig.h (GET_MEM): Likewise.
* mallocx.c (GC_malloc_many, GC_memalign): Likewise.
* os_dep.c (GC_wince_get_mem, GC_win32_get_mem): Likewise.
* typd_mlc.c (GC_malloc_explicitly_typed,
GC_malloc_explicitly_typed_ignore_off_page,
GC_calloc_explicitly_typed): Likewise.
* headers.c (GC_scratch_alloc): Change type of bytes_to_get from word
to size_t (because ROUNDUP_PAGESIZE_IF_MMAP result type changed).
* include/private/gc_priv.h: Include limits.h (unless SIZE_MAX already
defined).
* include/private/gc_priv.h (GC_SIZE_MAX, GC_SQRT_SIZE_MAX): Move from
malloc.c file.
* include/private/gc_priv.h (SIZET_SAT_ADD): New macro (defined before
include gcconfig.h).
* include/private/gc_priv.h (EXTRA_BYTES, GC_page_size): Change type
to size_t.
* os_dep.c (GC_page_size): Likewise.
* include/private/gc_priv.h (ROUNDUP_GRANULE_SIZE, ROUNDED_UP_GRANULES,
ADD_SLOP, ROUNDUP_PAGESIZE): Add comment about the argument.
* include/private/gcconfig.h (GET_MEM): Likewise.
* include/private/gc_priv.h (ROUNDUP_GRANULE_SIZE, ROUNDED_UP_GRANULES,
ADD_SLOP, OBJ_SZ_TO_BLOCKS, ROUNDUP_PAGESIZE,
ROUNDUP_PAGESIZE_IF_MMAP): Rename argument to "lb".
* include/private/gc_priv.h (OBJ_SZ_TO_BLOCKS_CHECKED): New macro.
* include/private/gcconfig.h (GC_win32_get_mem, GC_wince_get_mem,
GC_unix_get_mem): Change argument type from word to int.
* os_dep.c (GC_unix_mmap_get_mem, GC_unix_get_mem,
GC_unix_sbrk_get_mem, GC_wince_get_mem, GC_win32_get_mem): Likewise.
* malloc.c (GC_alloc_large_and_clear): Call OBJ_SZ_TO_BLOCKS only
if no value wrap around is guaranteed.
* malloc.c (GC_generic_malloc): Do not check for lb_rounded < lb case
(because ROUNDED_UP_GRANULES and GRANULES_TO_BYTES guarantees no value
wrap around).
* mallocx.c (GC_generic_malloc_ignore_off_page): Likewise.
* misc.c (GC_init_size_map): Change "i" local variable type from int
to size_t.
* os_dep.c (GC_write_fault_handler, catch_exception_raise): Likewise.
* misc.c (GC_envfile_init): Cast len to size_t when passed to
ROUNDUP_PAGESIZE_IF_MMAP.
* os_dep.c (GC_setpagesize): Cast GC_sysinfo.dwPageSize and
GETPAGESIZE() to size_t (when setting GC_page_size).
* os_dep.c (GC_unix_mmap_get_mem, GC_unmap_start, GC_remove_protection):
Expand ROUNDUP_PAGESIZE macro but without value wrap-around checking
(the argument is of word type).
* os_dep.c (GC_unix_mmap_get_mem): Replace -GC_page_size with
~GC_page_size+1 (because GC_page_size is unsigned); remove redundant
cast to size_t.
* os_dep.c (GC_unix_sbrk_get_mem): Add explicit cast of GC_page_size
to SBRK_ARG_T.
* os_dep.c (GC_wince_get_mem): Change type of res_bytes local variable
to size_t.
* typd_mlc.c: Do not include limits.h.
* typd_mlc.c (GC_SIZE_MAX, GC_SQRT_SIZE_MAX): Remove (as defined in
gc_priv.h now).

Fix page calculation in checksums

While consistent use of rounding mode for computing GC_faulted entries
is ok, the proper way of getting page number of an address is just to
clear the lowest bits of the latter.

* checksums.c (GC_record_fault, GC_was_faulted): Do not round-up when
computing page.
* checksums.c (GC_record_fault): Add assertion that GC_page_size is
initialized.

Travis CI configuration: temporarily remove --enable-handle-fork
(while OS X handle-fork is not fixed)

Fix 'shift count >= width of type' compiler warning in GC_SQRT_SIZE_MAX
(fix commits 83231d0, 4e1a6f9)

* malloc.c (GC_SQRT_SIZE_MAX): Change type from unsigned to size_t.
* typd_mlc.c (GC_SQRT_SIZE_MAX): Likewise.

Fix typo in comment of GC_lock (Win32)

* win32_threads.c [USE_PTHREAD_LOCKS] (GC_lock): Fix typo in comment
("pthread_mutex_trylock").

Adjust code indentation of calloc_explicitly_typed

* typd_mlc.c (GC_calloc_explicitly_typed): Adjust code indentation.

Fix calloc_explicitly_typed in case of lb*n overflow

* typd_mlc.c: Include limits.h (for SIZE_MAX).
* typd_mlc.c (GC_SIZE_MAX, GC_SQRT_SIZE_MAX): New macro (same as in
malloc.c).
* typd_mlc.c (GC_calloc_explicitly_typed): Return NULL if lb * n
overflows (same algorithm as in calloc defined in malloc.c); eliminate
lb *= n code duplication.

Fix double multiplication of lb by n in calloc_explicitly_typed

* typd_mlc.c (GC_calloc_explicitly_typed): Do not multiply lb by n
twice (when passed to GC_malloc in case of
GC_general_register_disappearing_link fails).

Eliminate 'constructor with 1 argument is not explicit' cppcheck warning

Note that -D CPPCHECK should be passed to cppcheck to activate
this workaround.

* include/gc_allocator.h (GC_ATTR_EXPLICIT): New macro (defined to
"explicit" keyword if at least C++11 or CPPCHECK, otherwise to empty).
* include/gc_allocator.h (gc_allocator::gc_allocator,
gc_allocator_ignore_off_page::gc_allocator_ignore_off_page,
traceable_allocator::traceable_allocator): Use GC_ATTR_EXPLICIT.
* tests/test_cpp.cc (A::A, B::B, C::C, D::D): Likewise.
* tests/test_cpp.cc (GC_ATTR_EXPLICIT): Define macro (as empty) unless
already defined in included gc_allocator.h.

Fix 'void pointers in calculations: behavior undefined' cppcheck warning

* dbg_mlc.c (OFN_UNSET): Replace -1 with ~(signed_word)0; add
outermost parentheses.

Workaround 'suspicious pointer subtraction' cppcheck warning in gc_cpp

* include/gc_cpp.h (gc_cleanup::gc_cleanup): Add extra parentheses
around (char*)this to outline that "this" pointer subtraction is
intentional (i.e., "this->" was not intended).

Eliminate 'class defines member variable with name also defined in parent' cppcheck warning

* tests/test_cpp.cc (F::nFreed, F::nAllocated): Add 'F' suffix to field name (to avoid
hiding the similar one in the parent class).

Eliminate 'C-style pointer casting' cppcheck style warnings in test

* tests/test_cpp.cc (D::CleanUp, main): Use static_cast instead of
C-style pointer cast.

Eliminate 'assigned value never used' CSA warning in min_bytes_allocd

The warning was reported only if GC_ALWAYS_MULTITHREADED.

* alloc.c (min_bytes_allocd): Assign stack_size value for the
single-threaded case only if GC_need_to_lock is false.

Workaround 'va_list used before va_start' cppcheck error in cord

Note that -D CPPCHECK should be passed to cppcheck to activate
this workaround.

* cord/cordprnt.c (CORD_vsprintf) [CPPCHECK]: Force to use va_copy
and va_end.
* cord/cordprnt.c (CORD_vsprintf): Set res to -1 if invalid format
specifier (instead of immediate return -1); call va_end at a single
place.

Workaround 'struct member Generic::null never used' cppcheck style warning

* cord/cordbscs.c (CORD_from_fn): Check that 'null' field of the
allocated Function object is zero.

Eliminate 'checking if unsigned variable is <0' cppcheck style warning

* cord/cordbscs.c (CORD_from_fn, CORD_substr): Do not expect size_t
value to be negative (replace <=0 comparison with ==0 one).
* cord/cordxtra.c (CORD_cmp): Likewise.
* cord/cordbscs.c (CORD_substr): Remove obsolete comment (about SunOS 4
which had signed size_t type).

Eliminate 'condition is always true' cppcheck style warning

* cord/cordprnt.c (CORD_vsprintf): Comment out always-true expression
about long_arg.