Eliminate 'comparison is always false' code defect in get_maps

In case of a single-threaded build, the comparison is always false
because maps_size>=0 and old_maps_size<=0.

* os_dep.c [NEED_PROC_MAPS] (GC_get_maps): Do not evaluate
maps_size<old_maps_size inside while expression if THREADS; remove
comment.

Eliminate 'poor global variable name' code defect in typd_mlc
(fix of commit a825a2d)

* typd_mlc.c (ld, ad, sd): Remove unused global variables.

Add LGTM.com code quality badges to README.md

Update AUTHORS file (add Demyan Kimitsa)

Fix start_world not resuming all threads on Darwin

Issue #231 (bdwgc).

This happens due mach thread ports are released in GC_stop_world as
a result in some cases the system creates new one and GC_start_world
will not find the thread to resume; in turn, the threads will stay
suspended.  When this happens to GDC threads, the application is
terminated as the message loop is halt.

The high-level description of the change: thread mach port is not
deallocated when thread is saved in GC_mach_threads as it causes thread
not being resumed as thread port object can be changed; threads are now
being suspended without check of suspend_count (as it can be suspended
by client); the logic of resume is changed, now the primary cycle
iterates threads to resume in GC_mach_threads.

* darwin_stop_world.c (struct GC_mach_thread): Rename already_suspended
filed to suspended.
* darwin_stop_world.c [!GC_NO_THREADS_DISCOVERY]
(GC_suspend_thread_list): Add my_task argument; remove info an outCount
local variables; call mach_port_deallocate uless threaded is added to
GC_mach_threads; do not call thread_info; update the relevant comments.
* darwin_stop_world.c [!GC_NO_THREADS_DISCOVERY] (GC_stop_world):
Remove i local variable; do not call mach_port_deallocate for prevlist
items; add comment.
* darwin_stop_world.c (GC_thread_resume): Call WARN instead of ABORT
if thread_resume failed.
* darwin_stop_world.c [!GC_NO_THREADS_DISCOVERY] (GC_start_world):
Initialize j to listcount; iterate over GC_mach_threads in the outer
loop; if thread is suspended then find it in act_list; if found then
resume thread; call mach_port_deallocate for act_list items.

Fix indentation of 'define GC_DATAEND' in gc.h
(fix of commit 4e24d219d)

* include/gc.h [__CYGWIN__ && !__x86_64__] (GC_DATAEND): Fix
indentation.

Travis CI: Fix missing semicolon at the end of GNU_DOWNLOAD_SITE assignment
(fix of commit a9690ac)

Update ChangeLog file (add v7.6.8 release date)

Travis CI: Put GNU S/W download base URL in a dedicated variable
(code refactoring)

Update ChangeLog file

Remove redundant checking of CPPCHECK macro in gc_cpp.h
(fix of commit 5e51e8d)

Issue #229 (bdwgc).

* include/gc_cpp.h [(_MSC_VER || __DMC__ || (__CYGWIN32__ || __CYGWIN__
|| __MINGW32__) && !GC_BUILD && !GC_NOT_DLL) && __cplusplus>201103L
&& GC_OPERATOR_NEW_ARRAY] (operator delete[](void*,size_t)): Define
even in case of CPPCHECK.

Fix delete operator redirection if gc_cpp is built as .dll (Cygwin, MinGW)

Issue #229 (bdwgc).

* include/gc_cpp.h [(__CYGWIN32__ || __CYGWIN__ || __MINGW32__)
&& !GC_BUILD && !GC_NOT_DLL && GC_OPERATOR_NEW_ARRAY] (operator new[],
operator delete[]): Define inline function.
* include/gc_cpp.h [(__CYGWIN32__ || __CYGWIN__ || __MINGW32__)
&& !GC_BUILD && !GC_NOT_DLL] (operator new, operator delete): Likewise.
* include/gc_cpp.h [_MSC_VER || __DMC__ || (__CYGWIN32__ || __CYGWIN__
|| __MINGW32__) && !GC_BUILD && !GC_NOT_DLL && __cplusplus>201103L]
(operator delete(void*,size_t)): Likewise.
* include/gc_cpp.h [_MSC_VER || __DMC__ || (__CYGWIN32__ || __CYGWIN__
|| __MINGW32__) && !GC_BUILD && !GC_NOT_DLL && __cplusplus>201103L
&& GC_OPERATOR_NEW_ARRAY && !CPPCHECK]
(operator delete[](void*,size_t)): Likewise.
* include/gc_cpp.h (operator new(size_t, int, const char*, int),
operator new[](size_t, int, const char*, int)): Do not define
for __DMC__.

Fix 'undefined reference to GC_incremental' linker error in pthread_start
(fix of commit 73d30d2)

GC_incremental is declared as static in case of NO_DEBUGGING.

* pthread_start.c [GC_PTHREADS && !GC_WIN32_THREADS]
(GC_inner_start_routine): Call GC_end_stubborn_change instead of
GC_dirty; add comment.

Use include gc.h with the angle brackets in the man page synopsis

* doc/gc.man (.TH): Update the date.
* doc/gc.man (SYNOPSIS): Replace include "gc.h" to include <gc.h>.

Travis CI: Use TEST_MANUAL_VDB instead of MANUAL_VDB

New API to turn on manual VDB at runtime

Manual VDB is now enabled by GC_set_manual_vdb_allowed(1) if called
before entering the GC incremental mode.

* alloc.c (GC_allocobj): Expand TRUE_INCREMENTAL macro.
* darwin_stop_world.c [MPROTECT_VDB] (GC_stop_world, GC_start_world):
Use GC_auto_incremental instead of GC_incremental.
* mark.c (alloc_mark_stack): Likewise.
* mark.c [PROC_VDB] (GC_push_all): Likewise.
* mark.c [!NEED_FIXUP_POINTER && THREADS && MPROTECT_VDB]
(GC_push_all_stack): Likewise.
* pthread_support.c [CAN_HANDLE_FORK && GC_DARWIN_THREADS
&& MPROTECT_VDB] (GC_atfork_prepare): Likewise.
* win32_threads.c [MPROTECT_VDB && !CYGWIN32]
(GC_register_my_thread_inner): Likewise.
* win32_threads.c [MPROTECT_VDB] (UNPROTECT_THREAD): Likewise.
* doc/gcdescr.md (Generational Collection and Dirty Bits): Update
documentation for the manual VDB.
* include/gc.h (GC_end_stubborn_change): Update comment.
* mark_rts.c (GC_push_all_stack_partially_eager): Likewise.
* include/gc.h (GC_set_manual_vdb_allowed, GC_get_manual_vdb_allowed):
New public function.
* include/private/gc_priv.h (GC_grungy_pages, GC_dirty_pages): Define
for all VDB modes.
* include/private/gc_priv.h (GC_auto_incremental, GC_manual_vdb):
Define.
* include/private/gc_priv.h [!GC_DISABLE_INCREMENTAL] (GC_dirty): Use
GC_manual_vdb instead of GC_incremental.
* include/private/gcconfig.h (GWW_VDB, MPROTECT_VDB, PCR_VDB): Do not
undefine if MANUAL_VDB.
* mallocx.c (GC_generic_malloc_many): Always allocate a single object
(and call GC_dirty_inner/REACHABLE_AFTER_DIRTY) if GC_manual_vdb.
* misc.c [!CAN_HANDLE_FORK && DARWIN && MPROTECT_VDB && !THREADS
&& !SMALL_CONFIG] (GC_set_handle_fork): Do not ABORT if GC_manual_vdb.
* misc.c [!SMALL_CONFIG] (manual_vdb_allowed): New static variable.
* misc.c [!SMALL_CONFIG] (GC_set_manual_vdb_allowed,
GC_get_manual_vdb_allowed): Implement.
* misc.c [!CHECKSUMS && !SMALL_CONFIG] (GC_init,
GC_enable_incremental): Set GC_manual_vdb and GC_incremental to true
if manual_vdb_allowed; do not call GC_dirty_init if manual_vdb_allowed.
* os_dep.c: Update comment about MANUAL_VDB.
* os_dep.c [MANUAL_VDB] (GC_dirty_init,
async_set_pht_entry_from_index): Remove.
* os_dep.c [!GC_DISABLE_INCREMENTAL] (GC_manual_vdb): Define global
variable.
* os_dep.c [!GC_DISABLE_INCREMENTAL] (GC_dirty_inner): Define
regardless of the VDB mode; add FIXME.
* os_dep.c [!GC_DISABLE_INCREMENTAL] (GC_read_dirty, GC_page_was_dirty,
GC_remove_protection): Implement for the case of GC_manual_vdb is true;
do not depend on MANUAL_VDB.
* tests/disclaim_test.c [TEST_MANUAL_VDB] (main): Call
GC_set_manual_vdb_allowed(1) before GC_INIT.
* tests/staticrootslib.c [TEST_MANUAL_VDB] (libsrl_init): Likewise.
* tests/test_cpp.cc [TEST_MANUAL_VDB] (main): Likewise.
* tests/test.c (INIT_MANUAL_VDB_ALLOWED): New macro.
* tests/test.c (GC_COND_INIT): Invoke INIT_MANUAL_VDB_ALLOWED (before
GC_OPT_INIT).
* tests/test.c [!SMALL_CONFIG] (main): Call GC_get_manual_vdb_allowed.

Update ChangeLog file (add v7.4.14 release date)

Update ChangeLog file (add v7.2l release date)

Update AUTHORS file

Initial single-threaded support of Interix subsystem

* include/private/gc_priv.h [__INTERIX] (_ALL_SOURCE): Define macro.
* include/private/gcconfig.h [__INTERIX] (I386, INTERIX,
mach_type_known): Likewise.
* include/private/gcconfig.h [I386 && INTERIX] (OS_TYPE, DATASTART,
DATAEND, STACKBOTTOM, USE_MMAP, USE_MMAP_ANON): Likewise.
* include/private/gcconfig.h [I386 && INTERIX] (_data_start__,
_bss_end__): Declare extern variable.

Update ChangeLog file

Update ChangeLog file (v7.6 changes)

Update ChangeLog file (v7.2 - v7.4 changes only)

Consistently use AS_HELP_STRING for configure new options
(code refactoring)

* configure.ac (thread-local-alloc, threads-discovery, mmap,
dynamic-loading, register-main-static-data, gcov): Replace deprecated
AC_HELP_STRING to AS_HELP_STRING.

Fix incorrect roots order after root removal in remove_roots_subregion
(fix of commits 38d194a, e849b45)

Issue #218 (bdwgc).

* mark_rts.c [USE_PROC_FOR_LIBRARIES] (swap_static_roots): New inline
function.
* mark_rts.c [USE_PROC_FOR_LIBRARIES] (GC_remove_roots_subregion):
Use swap_static_roots (after GC_add_roots_inner); if there is
a temporary root after GC_remove_root_at_pos then swap it with the
appropriate non-temporary one to ensure all temporary roots are
grouped at the end.

Fix the build for Emscripten
(part of commit 0f9ef2d from Unity-Technologies/bdwgc)

Issue #173 (bdwgc).

* mark_rts.c [!CPPCHECK && __GNUC__>=4] (GC_approx_sp): Do not use
__builtin_frame_address if STACK_NOT_SCANNED.

Fix the build for N3DS
(part of commit 0f9ef2d from Unity-Technologies/bdwgc)

Issue #173 (bdwgc).

* include/gc.h [GC_BUILD && NN_PLATFORM_CTR] (GC_on_thread_event_proc):
Define type.
* include/private/gc_locks.h [NN_PLATFORM_CTR || NINTENDO_SWITCH]
(GC_lock, GC_unlock): Declare function.
* include/private/gc_locks.h [NN_PLATFORM_CTR || NINTENDO_SWITCH]
(UNCOND_LOCK, UNCOND_UNLOCK): Define macro.
* include/private/gc_priv.h [THREADS && !SN_TARGET_ORBIS
&& !SN_TARGET_PSP2]: Do not include gc_atomic_ops.h if NN_PLATFORM_CTR.
* pthread_support.c [USE_SPIN_LOCK || !NO_PTHREAD_TRYLOCK] (GC_pause):
Call GC_noop1 instead of AO_compiler_barrier unless AO_CLEAR defined.

Update AUTHORS file (add Josh Peterson)

Fix the build for Orbis and PSP2
(part of commit 0f9ef2d from Unity-Technologies/bdwgc)

Issue #173 (bdwgc).

* include/private/pthread_stop_world.h [!GC_OPENBSD_UTHREADS && !NACL]
(thread_stop_info): Do not define last_stop_count if SN_TARGET_ORBIS
or SN_TARGET_PSP2.
* include/private/pthread_stop_world.h [!NACL && SN_TARGET_ORBIS]
(thread_stop_info): Declare registers field.

Fix compilation of darwin_stop_world for iOS 8+
(part of commit c6e7e36 from Unity-Technologies/bdwgc)

Issue #173 (bdwgc).

* darwin_stop_world.c [ARM32 && ARM_THREAD_STATE32]
(GC_stack_range_for): Set state to unified_state instead of
unified_state.ts_32.

Fix more compilation issues for XboxOne
(part of commit c6e7e36 from Unity-Technologies/bdwgc)

Issue #173 (bdwgc).

* include/private/gc_priv.h [!CPPCHECK && !PCR && MSWIN_XBOX1
&& !DebugBreak] (DebugBreak): Define to __debugbreak.
* misc.c [MSWIN32] (GC_win32_MessageBoxA): Do not define if MSWIN_XBOX1.
* misc.c [!PCR && !SMALL_CONFIG && MSWIN32] (GC_default_on_abort): Do
not call GC_win32_MessageBoxA() if MSWINRT_FLAVOR or MSWIN_XBOX1.

Allow register_main_static_data disabling in CMake script

* CMakeLists.txt (enable_register_main_static_data): New OPTION (on by
default).
* CMakeLists.txt [!enable_register_main_static_data]: Define
GC_DONT_REGISTER_MAIN_STATIC_DATA macro.

Allow dynamic_loading disabling in CMake script

* CMakeLists.txt (enable_dynamic_loading): New OPTION (on by default).
* CMakeLists.txt [!enable_dynamic_loading]: Define
IGNORE_DYNAMIC_LOADING macro.

Allow mmap enabling in CMake script

* CMakeLists.txt (enable_mmap): New OPTION (off by default).
* CMakeLists.txt [!enable_munmap && enable_mmap]: Define USE_MMAP macro.

Allow threads_discovery disabling in CMake script

* CMakeLists.txt (enable_threads_discovery): New OPTION (on by default).
* CMakeLists.txt [!enable_threads_discovery]: Define
GC_NO_THREADS_DISCOVERY macro.

Fix wrong expression for ENDIF in CMakeLists.txt
(fix of commit 1aabce0f9)

* CMakeLists.txt [enable_checksums]: Remove enable_threads for ENDIF.

Define DYNAMIC_LOADING for Darwin unless IGNORE_DYNAMIC_LOADING

DYNAMIC_LOADING macro is now controlled by
configure --disable-dynamic-loading option.

* include/private/gcconfig.h [DARWIN && (I386 || AARCH64 || ARM32
|| X86_64)] (DYNAMIC_LOADING): Define even if
GC_DONT_REGISTER_MAIN_STATIC_DATA.

New configure --disable-register-main-static-data option
(part of commit 6be3fb4 from Unity-Technologies/bdwgc)

Issue #173 (bdwgc).

* configure.ac (register-main-static-data): New AC_ARG_ENABLE.
* configure.ac [$enable_register_main_static_data=no]
(GC_DONT_REGISTER_MAIN_STATIC_DATA): Define AC macro.

New configure --disable-dynamic-loading option
(part of commit 6be3fb4 from Unity-Technologies/bdwgc)

Issue #173 (bdwgc).

* configure.ac (dynamic-loading): New AC_ARG_ENABLE.
* configure.ac [$enable_dynamic_loading=no] (IGNORE_DYNAMIC_LOADING):
Define AC macro.

New configure --enable-mmap option
(part of commit 6be3fb4 from Unity-Technologies/bdwgc)

Issue #173 (bdwgc).

* configure.ac (mmap): New AC_ARG_ENABLE (store the result to
gc_use_mmap).

Adjust formatting of configure help messages and config.h comments

* configure.ac (getcontext, execinfo.h, setjmp.h, GC_BUILTIN_ATOMIC):
Add trailing dot in AC_DEFINE comment message.
* configure.ac (gcj-support, java-finalization, atomic-uncollectable,
disclaim): Remove trailing dot in AC_HELP_STRING help message.
* configure.ac (gcj-support, sigrt-signals, java-finalization,
atomic-uncollectable, redirect-malloc, disclaim, large-config,
handle-fork, munmap, checksums, werror, single-obj-compilation,
gcov, docs): Start AC_HELP_STRING help message with a lowercase letter.
* configure.ac (werror): Wrap help message into AS_HELP_STRING.

Update AUTHORS file (add Michael DeRoy)

New configure --disable-threads-discovery option
(part of commit 7b2813c from Unity-Technologies/bdwgc)

Issue #173 (bdwgc).

* configure.ac (threads-discovery): New AC_ARG_ENABLE.
* configure.ac [$enable_threads_discovery=no]
(GC_NO_THREADS_DISCOVERY): Define macro.

Travis CI: Output content of disclaim_bench.log

Export stop/start_world_external only for multi-threaded builds
(fix of commit bb91f03)

Issue #173 (bdwgc).

Also, update GC_world_stopped value in GC_stop_world_external and
GC_start_world_external.

* include/gc.h (GC_stop_world_external, GC_start_world_external): Do not
declare unless GC_THREADS; add comment.
* misc.c (GC_stop_world_external, GC_start_world_external): Do not
define unless THREADS; add assertion that GC is initialized.
* misc.c [THREADS && THREAD_LOCAL_ALLOC] (GC_stop_world_external): Set
GC_world_stopped to true after STOP_WORLD; add assertion that the
world is not stopped.
* misc.c [THREADS && THREAD_LOCAL_ALLOC] (GC_start_world_external): Set
GC_world_stopped to false before START_WORLD; add assertion that the
world is stopped.
* tests/test.c [GC_PTHREADS && CPPCHECK] (main): Add UNTESTED for
GC_stop_world_external and GC_start_world_external.

Fix UNTESTED for multi-threaded API functions in gctest
(fix of commits c5d4ef9c1, 857bb8ad6)

* tests/test.c [!PCR && !GC_WIN32_THREADS && !GC_PTHREADS && CPPCHECK
&& THREADS] (main): Remove UNTESTED for GC_allow_register_threads,
GC_get_on_thread_event, GC_register_altstack, GC_set_on_thread_event.
* tests/test.c [GC_PTHREADS && CPPCHECK] (main): Add UNTESTED for
GC_allow_register_threads, GC_get_on_thread_event,
GC_register_altstack, GC_set_on_thread_event.

New API to stop and start the GC world externally
(part of commits 39e14be, 05e3377 from Unity-Technologies/bdwgc)

Issue #173 (bdwgc).

* include/gc.h (GC_stop_world_external, GC_start_world_external):
Declare new API function.
* misc.c (GC_stop_world_external, GC_start_world_external): Implement.

Update AUTHORS file (add Jonas Echterhoff)

Fix the BDWGC build on XboxOne
(fix of commit d16debf)

Issue #173 (bdwgc).

This fixes durango_get_mem() definition.

* os_dep.c [MSWIN_XBOX1] (durango_get_mem): Define even if
MMAP_SUPPORTED is not defined.

Fix suspend_thread_list in case of thread_suspend is interrupted
(fix of commit e8cdc7c)

* darwin_stop_world.c [!GC_NO_THREADS_DISCOVERY]
(GC_suspend_thread_list): Retry thread_suspend if failed with
KERN_ABORTED.

Perform thread_suspend in loop as it may be interrupted (Darwin)

* darwin_stop_world.c (GC_stop_world): Retry thread_suspend() on
KERN_ABORTED.

Remove PUSH_CONTENTS_HDR multi-line macro
(code refactoring)

* include/private/gc_pmark.h (PUSH_CONTENTS): Use GC_push_contents_hdr
instead of PUSH_CONTENTS_HDR.
* mark.c (GC_mark_and_push, GC_mark_and_push_stack): Likewise.
* include/private/gc_pmark.h (PUSH_CONTENTS_HDR): Replace macro
definitions with a unified inline function (GC_push_contents_hdr);
return updated value of mark_stack_top; remove unnecessary type casts
and parentheses.
* include/private/gc_priv.h [!KEEP_BACK_PTRS] (GC_STORE_BACK_PTR): Cast
source argument to void (to avoid "unused argument" compiler warning).

Update copyright information in alloc.c and gc.c
(fix of commit 3bd265a)

* README.md (Copyright & Warranty): Adjust copyright date.
* alloc.c: Update header copyright (add Ivan Maidanski).
* extra/gc.c: Likewise.
* alloc.c (GC_copyright): Update copyright string value.

Add outermost parentheses to HCE definition
(code refactoring)

* include/private/gc_hdrs.h [COUNT_HDR_CACHE_HITS] (HC_HIT, HC_MISS):
Cast result to void.
* include/private/gc_hdrs.h (HCE): Wrap the whole expression into
parentheses.

Update copyright information in the documentation and gc.h files

* AUTHORS: Add info about the maintainer.
* README.QUICK: Update header copyright (add Ivan Maidanski).
* include/gc.h: Likewise.
* README.md (Copyright & Warranty): Update copyright (add the
missing copyrights from the source code files).
* doc/gc.man (.TH): Update modification date.
* doc/gc.man (.SH AUTHOR): Update; add reference to AUTHORS file.

Remove libatomic_ops license information

atomic_ops library is not included in BDWGC distribution since v7.4.

* README.md (Copyright & Warranty): Remove libatomic_ops license
information.

windows-untested: Update copyright in gc.ver

Remove info how to send bugs from README.cords

* doc/README.cords: Remove information about sending bugs from this
file (clients should refer to the base README regarding bugs
submission).

Do not use NULL in gc_inline.h
(fix of commits 64bed186f, 0ff8f033c)

* include/gc_inline.h (GC_FAST_MALLOC_GRANS, GC_CONS): Replace NULL
to 0.

Update ChangeLog file

Update ChangeLog file (v7.6 changes only)
(a cherry-pick of commit 0584756c from 'release-7_6')

Update ChangeLog file (v7.2 - v7.4 changes only)
(a cherry-pick of commit d46e0fda from 'release-7_4')

Update NT_MAKEFILE usage information in README files for Win32 and Win64

Issue #223 (bdwgc).

* doc/README.win32 (Microsoft Tools): Provide a sample how to build
static library without threads support.
* doc/README.win64: Likewise.
* doc/README.win32 (Threads): Provide a sample how to build dynamic
collector with threads support using NT_MAKEFILE.
* doc/README.win64: Likewise.

Fix Borland version in documentation to match that in BCC_MAKEFILE

* doc/README.win32: Rename "Borland 4.5" to "Borland C++ Builder".
* doc/README.win32 (Borland Tools): Change version from 4.5 to 5.5.

Fix GC_is_valid_displacement and GC_is_visible for non-small objects

* ptr_chck.c (GC_is_valid_displacement): Remove redundant
IS_FORWARDING_ADDR_OR_NIL(hhdr) call if GC_all_interior_pointers.
* ptr_chck.c (GC_is_valid_displacement): Do not goto fail if
p+sz-offset > h+1 but IS_FORWARDING_ADDR_OR_NIL(HDR(h+1)).
* ptr_chck.c (GC_is_visible): Transform comment about GC_base to
a TODO item; set hhdr to HDR(base) instead of HDR(p)
if HBLKPTR(base)!=HBLKPTR(p).

Fix build for Android after enabling handle-fork by default
(fix of commit 686a667)

Issue #174 (bdwgc).

* CMakeLists.txt [CMAKE_USE_PTHREADS_INIT]: Do not define HANDLE_FORK
macro for android host.
* configure.ac [$enable_handle_fork!=yes/no/manual && THREADS=xposix]:
Likewise.

Update AUTHORS file (add woollybah)

Fix build for Nintendo platform
(fix of commit 9718229)

Issue #228 (bdwgc).

The NINTENDO_SWITCH defines in gcconfig.h were in the wrong section
(under ARM32).  Now they are under AARCH64 instead.

* include/private/gcconfig.h (__arm__): Remove checking of
NN_BUILD_TARGET_PLATFORM_NX.
* include/private/gcconfig.h [AARCH64 && NINTENDO_SWITCH] (__bss_end,
NO_HANDLE_FORK, DATASTART, DATAEND, switch_get_stack_bottom,
STACKBOTTOM): Move from ARM32 section.

Fix 'pointer arithmetic with NULL' code defect in print_callers

* os_dep.c [NEED_CALLINFO && LINUX && !SMALL_CONFIG] (GC_print_callers):
If nl is null then pass result_len (instead of nl-result_buf) to strncmp;
adjust code indentation.

Eliminate 'ptr arithmetic with NULL' cppcheck warning in alloc_mark_stack

* mark.c (alloc_mark_stack): Wrap GC_mark_stack_limit (and
GC_mark_stack, GC_mark_stack_size) assignment into "else" block (after
EXIT).

Eliminate 'condition is always true' cppcheck warning in init_gcj_malloc

* gcj_mlc.c (GC_init_gcj_malloc): Define ignore_gcj_info as macro
if GC_IGNORE_GCJ_INFO; undefine ignore_gcj_info at the end of the
function.

Eliminate 'scope of var can be reduced' cppcheck warning in pthread_join

* win32_threads.c [GC_PTHREADS && GC_WIN32_PTHREADS] (GC_pthread_join):
Declare t local variable in the block where the variable is used.

Fix missing dirty and reachable_here calls in typed_test
(fix of commits b52c140d3, 263ffbbfd, 2e7daad62)

* tests/test.c [!NO_TYPED_TEST] (typed_test): Call GC_PTR_STORE_AND_DIRTY
to store old value to newP[1].

Remove PUSH_OBJ multi-line macro
(code refactoring)

* finalize.c (GC_normal_finalize_mark_proc): Call GC_push_obj instead
of PUSH_OBJ.
* include/private/gc_pmark.h (PUSH_CONTENTS_HDR): Likewise.
* mark.c (GC_push_marked): Likewise.
* mark.c [ENABLE_DISCLAIM] (GC_push_unconditionally): Likewise.
* finalize.c (GC_normal_finalize_mark_proc): Remove hhdr local
variable.
* include/private/gc_pmark.h (PUSH_OBJ): Transform macro to inline
function; rename to GC_push_obj; update comment; return mark_stack_top.

Fix test_cpp failure in case GC_DEBUG is defined

Now GC_bytes_freed is updated even if the real deallocation of the
explicitly freed object is deferred.

* dbg_mlc.c (GC_debug_free): Increment GC_bytes_freed by hhdr->hb_sz
in case of GC_free is not called (when the object is filled with
GC_FREED_MEM_MARKER); add comment.

Remove multi-line macros (ITERATE_DL_HASHTBL_*) in finalize
(code refactoring)

* finalize.c (ITERATE_DL_HASHTBL_BEGIN, ITERATE_DL_HASHTBL_END,
DELETE_DL_HASHTBL_ENTRY): Remove macro.
* finalize.c (GC_make_disappearing_links_disappear): Add
is_remove_dangling argument (true means removal of dangling disappearing
links, false means make the disappearing links disappear); rename curr
and next local variables to curr_dl and next_dl, respectively; expand
ITERATE_DL_HASHTBL_BEGIN, DELETE_DL_HASHTBL_ENTRY and
ITERATE_DL_HASHTBL_END macros; remove real_ptr local variable; reformat
code.
* finalize.c (GC_remove_dangling_disappearing_links): Remove.

Eliminate duplicate clear_mark_bit call when removing disappearing link
(fix of commit 8d13d52b6)

* finalize.c (GC_make_disappearing_links_disappear,
GC_remove_dangling_disappearing_links): Remove GC_clear_mark_bit call.

Remove multi-line macro (FOR_EACH_PRED) in backgraph
(code refactoring)

This change simplifies stepping thru backgraph code in gdb.

* backgraph.c (FOR_EACH_PRED): Remove macro.
* backgraph.c (add_edge): Rename old_back_ptr local variable to pred.
* backgraph.c (add_edge, backwards_height, update_max_height): Expand
FOR_EACH_PRED macro.
* backgraph.c (backwards_height): Rename back_ptr local variable to
pred.
* backgraph.c (backwards_height, update_max_height): Rename q local
variable to pred.
* backgraph.c (update_max_height): Rename q_height local variable to
this_height.

Travis CI: Test with explicit -D GC_DEBUG

New public API (PTR_STORE_AND_DIRTY) to simplify store-and-dirty operation

* cord/cordbscs.c (CORD_cat_char_star, CORD_cat, CORD_from_fn_inner,
CORD_substr_closure): Replace the last store to the heap-allocated
object, GC_END_STUBBORN_CHANGE() and GC_reachable_here() with
GC_PTR_STORE_AND_DIRTY() call.
* cord/tests/de.c (prune_map, add_map, replace_line): Likewise.
* include/gc_inline.h (GC_CONS): Likewise.
* tests/disclaim_test.c (pair_dct, pair_new): Likewise.
* tests/test.c [!VERY_SMALL_CONFIG] (cons): Likewise.
* tests/test.c (small_cons, small_cons_uncollectable,
reverse_test_inner, mktree): Likewise.
* tests/test.c [GC_GCJ_SUPPORT] (gcj_cons): Likewise.
* tests/test.c [GC_PTHREADS && !SMALL_CONFIG && !GC_DEBUG]
(alloc8bytes): Likewise.
* tests/test.c [!NO_TYPED_TEST] (typed_test): Likewise.
* tests/test_cpp.cc (main): Likewise.
* dbg_mlc.c (GC_debug_ptr_store_and_dirty): Implement.
* mallocx.c (GC_ptr_store_and_dirty): Likewise.
* include/gc.h (GC_PTR_STORE_AND_DIRTY): New public macro.
* include/gc.h (GC_debug_ptr_store_and_dirty, GC_ptr_store_and_dirty):
Declare new public API function; add comment.
* tests/test.c (reverse_test_inner): Remove tmp local variable.
* tests/test.c (mktree): Remove right_left local variable.

Eliminate 'language extension used' Clang warning in gc.h

* include/gc.h [GC_DEBUG && __GNUC__] (GC_PTR_ADD, GC_PRE_INCR,
GC_POST_INCR, GC_POST_DECR): Replace typeof to __typeof__.

Eliminate 'GC_DEBUG redefined' compiler warning in smashtest

* tests/smash_test.c (GC_DEBUG): Do not define if already done.

Compute GC_CONS arguments just once
(fix of commit 8eb6f8d)

* include/gc_inline.h (GC_CONS): Declare l and r local variables;
compute first and second expression even in case of
GC_MALLOC_WORDS_KIND failure; pass l and r to GC_reachable_here (instead
of first and second).

Same type casts for GC_PTR_STORE arguments regardless of GC_DEBUG

* include/gc.h [GC_DEBUG] (GC_PTR_STORE): Cast p and q to void*.
* include/gc.h [!GC_DEBUG] (GC_PTR_STORE): Cast p to void**, cast q to
void*.

Workaround 'condition is always false' VC++ warning in test_cpp
(fix of commit 5524a425d)

* tests/test_cpp.cc (GC_CHECKED_DELETE): Remove "do" and "while (0)".

Fix mark stack overflow checking in push_selected

* mark.c (GC_push_selected): In case of a danger of mark stack overflow
after the first GC_push_all() call then call GC_push_all(bottom, top)
and return; remove redundant checking of GC_mark_stack_top at the end
of the function (overflow is already checked in GC_push_all).

Add GC_reachable_here after GC_dirty in GC source
(fix of commits 73d30d2b4, e5fb574cf)

* README.md (Incremental Collection): Add note about bugs caused by
a missing GC_reachable_here call.
* doc/gcdescr.md (Generational Collection): Mention GC_reachable_here
for MANUAL_VDB mode.
* finalize.c (GC_register_disappearing_link_inner,
GC_register_finalizer_inner): Move GC_dirty(new_dl) call to be before
unlocking (so that to ensure no collection occurs between initialization
of new_dl and GC_dirty() call).
* finalize.c (GC_finalize): Call GC_dirty() immediately after updating
GC_fnlz_roots.fo_head (instead of setting needs_barrier) if
GC_object_finalized_proc is set.
* gcj_mlc.c (GC_gcj_malloc, GC_debug_gcj_malloc,
GC_gcj_malloc_ignore_off_page): Call
REACHABLE_AFTER_DIRTY(ptr_to_struct_containing_descr) after GC_dirty(op).
* include/gc.h (GC_end_stubborn_change): Mention GC_reachable_here
in comment.
* include/gc_inline.h (GC_FAST_MALLOC_GRANS): Call
GC_reachable_here(next) after GC_end_stubborn_change(my_fl); remove
GC_end_stubborn_change() call when a non-pointer is stored to my_fl;
remove GC_end_stubborn_change() after GC_generic_malloc_many() call.
* include/gc_inline.h (GC_CONS): Call GC_reachable_here for the stored
pointers after GC_end_stubborn_change call.
* include/private/gc_priv.h (REACHABLE_AFTER_DIRTY): New macro.
* mallocx.c [MANUAL_VDB] (GC_generic_malloc_many): If
GC_is_heap_ptr(result) then call GC_dirty(result) and
REACHABLE_AFTER_DIRTY(op) after storing op pointer.
* typd_mlc.c (GC_make_sequence_descriptor): Call REACHABLE_AFTER_DIRTY
for the stored pointers after GC_dirty(result).
* typd_mlc.c (GC_malloc_explicitly_typed,
GC_malloc_explicitly_typed_ignore_off_page, GC_calloc_explicitly_typed):
Call REACHABLE_AFTER_DIRTY(d) after GC_dirty(op).
* win32_threads.c (GC_CreateThread, GC_beginthreadex,
GC_pthread_create): Call REACHABLE_AFTER_DIRTY for the stored pointer
after GC_dirty.

Add GC_reachable_here after GC_END_STUBBORN_CHANGE in tests
(fix of commits b52c140d3, f72fc9d43, 08a380c3a)

* tests/disclaim_test.c (pair_dct, pair_new): Call GC_reachable_here
for the stored pointers after GC_end_stubborn_change call.
* tests/staticrootslib.c (libsrl_mktree): Call GC_reachable_here for
the stored pointers after GC_END_STUBBORN_CHANGE call.
* tests/test.c (cons, small_cons, small_cons_uncollectable, mktree,
typed_test): Likewise.
* tests/test.c [GC_GCJ_SUPPORT] (gcj_cons): Likewise.
* tests/test.c [!SMALL_CONFIG && !GC_DEBUG] (alloc8bytes): Likewise.
* tests/test_cpp.cc [!DONT_USE_STD_ALLOCATOR] (main): Likewise.
* tests/trace_test.c (mktree): Likewise.
* tests/test.c (reverse_test_inner): Declare tmp local variable; call
GC_END_STUBBORN_CHANGE() and GC_reachable_here() after storing pointers
to f[5], g[799] and h[1999].
* tests/test_cpp.cc (C_INIT_LEFT_RIGHT): New macro (to call
GC_END_STUBBORN_CHANGE and GC_reachable_here).
* tests/test_cpp.cc (C::C): Use C_INIT_LEFT_RIGHT().
* tests/test_cpp.cc (main): Remove GC_end_stubborn_change(c) call after
because GC_END_STUBBORN_CHANGE() is now called for this (in
C_INIT_LEFT_RIGHT) of the heap-allocated objects.

Add GC_reachable_here after GC_END_STUBBORN_CHANGE in cords
(fix of commit e12e820f3)

* cord/cordbscs.c (CORD_cat_char_star, CORD_cat, CORD_from_fn_inner,
CORD_substr_closure): Call GC_END_STUBBORN_CHANGE() instead of
GC_end_stubborn_change().
* cord/cordxtra.c (refill_cache): Likewise.
* cord/tests/de.c (prune_map, add_map, add_hist, replace_line,
generic_init): Likewise.
* cord/cordbscs.c (CORD_cat_char_star, CORD_cat): Mark x and y as
reachable after GC_END_STUBBORN_CHANGE(result).
* cord/cordbscs.c (CORD_from_fn_inner): Mark client_data as reachable
after GC_END_STUBBORN_CHANGE(result).
* cord/cordbscs.c (CORD_substr_closure): Mark x as reachable after
GC_END_STUBBORN_CHANGE(sa).
* cord/tests/de.c (prune_map): Mark saved map->previous->previous as
reachable after GC_END_STUBBORN_CHANGE(map).
* cord/tests/de.c (add_map): Mark saved current_map as reachable after
GC_END_STUBBORN_CHANGE(new_map).
* cord/tests/de.c (replace_line): Mark s as reachable after
GC_END_STUBBORN_CHANGE(screen+i).

Turn on GC assertions in NT_MAKEFILE for debug builds

* NT_MAKEFILE [!NODEBUG] (CFLAGS_DEBUG): Define variable (set to
-D GC_ASSERTIONS).
* NT_MAKEFILE (CFLAGS_SPECIFIC): Add $(CFLAGS_DEBUG).

Fix NT_MAKEFILE for VS 2017

Issue #223 (bdwgc).

Do not include ntwin32.mak anymore.

* NT_MAKEFILE: Do not include ntwin32.mak.
* NT_MAKEFILE (cc, link, rc, cflags, cvarsmt, cdebug, rcvars, ldebug):
Define variable.
* NT_MAKEFILE [!NMAKE_WINVER] (NMAKE_WINVER): Likewise.
* NT_MAKEFILE (CPU): Adjust the value (to be either "i386" or "AMD64").
* NT_MAKEFILE (gctest.exe, cord\de.exe, test_cpp.exe): Pass
"/INCREMENTAL:NO", "$(lflags)", "user32.lib", "gdi32.lib" arguments;
remove "$(guiflags)", "$(guilibs)" arguments.

Really use C11 static_assert if available (GCC/Clang/MSVC)
(fix of commit 7d34f4e5c)

Issue #223 (bdwgc).

Improve static assertion message as well.

* include/private/gc_priv.h [__STDC_VERSION__>=201112L]: Include
assert.h (to have static_assert defined).
* include/private/gc_priv.h [_MSC_VER>=1700] (GC_STATIC_ASSERT): Define
as static_assert.
* include/private/gc_priv.h [static_assert && __STDC_VERSION__>=201112L]
(GC_STATIC_ASSERT): Pass #expr as the 2nd argument to static_assert
(instead of "").

Add missing type casts in remap and register_my_thread_inner
(fix of commit a825a2d)

Issue #206 (bdwgc).

* os_dep.c [USE_MUNMAP && USE_WINALLOC] (GC_remap): Cast result of
VirtualAlloc to ptr_t.
* win32_threads.c [!GC_NO_THREADS_DISCOVERY]
(GC_register_my_thread_inner): Cast the first argument of
InterlockedExchange() call to word* (instead of void*).

Fix VirtualQuery call in case of malloc failure (Win32)

* os_dep.c [!REDIRECT_MALLOC && USE_WINALLOC]
(GC_add_current_malloc_heap): Do not call GC_get_allocation_base(new_l)
if new_l is null; cast malloc() result to the type of new_l.

Eliminate 'switch statement contains no case label' compiler warning

* mark.c [!USE_PUSH_MARKED_ACCELERATORS] (GC_push_marked): Add a dummy
case label before default; add comment.

Do not include windows.h when compiling gc_cpp.cc
(code refactoring)

* gc_cpp.cc (GC_DONT_INCL_WINDOWS_H): Define macro before include gc.h.
* tests/test_cpp.cc (GC_DONT_INCL_WINDOWS_H): Likewise.
* include/gc.h [GC_WIN32_THREADS && (!GC_PTHREADS || GC_BUILD
|| GC_WINDOWS_H_INCLUDED) && (!GC_NO_THREAD_DECLS || GC_BUILD)]:
If GC_DONT_INCL_WINDOWS_H then do not include process.h, windows.h,
and do not declare GC_CreateThread, GC_ExitThread, GC_DllMain,
GC_beginthreadex, GC_endthreadex.

Fast fail on invalid CPU parameter passed to NT_MAKEFILE

Issue #223 (bdwgc).

* NT_MAKEFILE (OBJS): Move misc.obj and win32_threads.obj to the
beginning of the list.
* NT_MAKEFILE (gctest.exe): Move $(GC_LIB) to the beginning of the list.

Consistently define WIN32_LEAN_AND_MEAN/NOSERVICE before include windows.h
(code refactoring)

Note: these macros are not (and should not be) defined in the public
headers (gc.h).

* cord/tests/de.c [WIN32] (WIN32_LEAN_AND_MEAN, NOSERVICE): Define
macro before include windows.h.
* cord/tests/de_win.c (WIN32_LEAN_AND_MEAN, NOSERVICE): Likewise.
* extra/msvc_dbg.c (WIN32_LEAN_AND_MEAN, NOSERVICE): Likewise.
* tests/initsecondarythread.c [!GC_PTHREADS] (WIN32_LEAN_AND_MEAN,
NOSERVICE): Likewise.
* tests/subthread_create.c [!GC_PTHREADS] (WIN32_LEAN_AND_MEAN,
NOSERVICE): Likewise.
* tests/test.c [MSWIN32 || MSWINCE] (WIN32_LEAN_AND_MEAN,
NOSERVICE): Likewise.
* tests/test_cpp.cc [MSWIN32] (WIN32_LEAN_AND_MEAN, NOSERVICE):
Likewise.
* tests/thread_leak_test.c [!GC_PTHREADS] (WIN32_LEAN_AND_MEAN,
NOSERVICE): Likewise.
* tools/setjmp_t.c [MSWIN32 || MSWINCE || CYGWIN32]
(WIN32_LEAN_AND_MEAN, NOSERVICE): Likewise.
* cord/tests/de_win.c: Replace include "windows.h" to
include <windows.h>.

Travis CI: Test compilation with -std=gnu11 option (clang and gcc)

.gitignore: Ignore '.vs' folders