WebAssembly for QtBase

This is the squashed diff from wip/webassembly to dev.

Done-with: Peng Wu <peng.wu@intopalo.com>
Done-with: Sami Enne <sami.enne@intopalo.com>
Done-with: Morten Johan Sørvig <morten.sorvig@qt.io>
Started-by: Andrew Knight <andrew.knight@intopalo.com>
Change-Id: I6562433c0a38d6ec49ab675e0f104f2665f3392d
Reviewed-by: Lorn Potter <lorn.potter@gmail.com>
Reviewed-by: Eskil Abrahamsen Blomfeldt <eskil.abrahamsen-blomfeldt@qt.io>

2 files changed, 271 insertions, 0 deletions

diff --git a/mkspecs/wasm-emscripten/qmake.conf b/mkspecs/wasm-emscripten/qmake.conf
new file mode 100644
index 0000000000..c3b67310c8
--- /dev/null
+++ b/mkspecs/wasm-emscripten/qmake.conf
@@ -0,0 +1,90 @@
+# qmake configuration for building with emscripten
+MAKEFILE_GENERATOR      = UNIX
+QMAKE_PLATFORM          = wasm unix
+
+include(../common/gcc-base.conf)
+include(../common/clang.conf)
+
+EMTERP_FLAGS = \
+    -s EMTERPRETIFY=1  \
+    -s EMTERPRETIFY_ASYNC=1 \
+    -s \"EMTERPRETIFY_FILE=\'data.binary\'\" \
+    -s ASSERTIONS=1 \
+    --profiling-funcs
+
+EMCC_COMMON_CFLAGS = \
+    -s USE_LIBPNG=1 \
+    -s USE_FREETYPE=1 \
+    -s USE_ZLIB=1
+
+EMCC_COMMON_LFLAGS = \
+    -s WASM=1 \
+    -s FULL_ES2=1 \
+    -s ALLOW_MEMORY_GROWTH=1 \
+    -s USE_WEBGL2=1 \
+    -s NO_EXIT_RUNTIME=0 \
+    -s ERROR_ON_UNDEFINED_SYMBOLS=1 \
+    --bind \
+    -s \"BINARYEN_METHOD=\'native-wasm\'\" \
+    -s \"BINARYEN_TRAP_MODE=\'clamp\'\"
+
+EMCC_COMMON_LFLAGS_DEBUG = \
+    $$EMCC_COMMON_LFLAGS \
+    -s ASSERTIONS=2 \
+    -s DEMANGLE_SUPPORT=1 \
+    # -s LIBRARY_DEBUG=1 \ #print out library calls, verbose
+    # -s SYSCALL_DEBUG=1 \ #print out sys calls, verbose
+    # -s FS_LOG=1 \ #print out filesystem ops, verbose
+    # -s SOCKET_DEBUG \ #print out socket,network data transfer
+    -s GL_DEBUG=1
+
+# the -s arguments can also be used with release builds
+# but here in debug for clarity
+
+QMAKE_COMPILER         += emscripten
+
+QMAKE_CC                = emcc
+QMAKE_CXX               = em++
+
+QMAKE_CFLAGS           += $$EMCC_COMMON_CFLAGS
+QMAKE_CXXFLAGS         += $$EMCC_COMMON_CFLAGS
+
+# Practical debugging setup:
+#    "-g4" preserves function names for stack traces
+#    "-Os" produces reasonably sized binaries
+QMAKE_CFLAGS_DEBUG     -= -g
+QMAKE_CXXFLAGS_DEBUG   -= -g
+QMAKE_CFLAGS_DEBUG     += -Os -g4
+QMAKE_CXXFLAGS_DEBUG   += -Os -g4
+QMAKE_LFLAGS_DEBUG     += -Os -g4
+
+QMAKE_CXXFLAGS_RELEASE -= -O2
+QMAKE_CXXFLAGS_RELEASE += -O3
+QMAKE_CFLAGS_RELEASE   -= -O2
+QMAKE_CFLAGS_RELEASE   += -O3
+QMAKE_LFLAGS_RELEASE   += -O3
+MAKE_CFLAGS_OPTIMIZE   += -O3
+MAKE_CFLAGS_OPTIMIZE_FULL += -Oz
+
+QMAKE_LINK              = $$QMAKE_CXX
+QMAKE_LINK_SHLIB        = $$QMAKE_CXX
+QMAKE_LINK_C            = $$QMAKE_CC
+QMAKE_LINK_C_SHLIB      = $$QMAKE_CC
+
+QMAKE_LIBS_THREAD       = $$QMAKE_CFLAGS_THREAD
+
+QMAKE_LFLAGS           += $$EMCC_COMMON_LFLAGS
+QMAKE_LFLAGS_DEBUG     += $$EMCC_COMMON_LFLAGS_DEBUG
+
+QMAKE_PREFIX_SHLIB      = lib
+QMAKE_EXTENSION_SHLIB   = so       # llvm bitcode, linked to js in post_link
+QMAKE_PREFIX_STATICLIB  = lib
+QMAKE_EXTENSION_STATICLIB = a      # llvm bitcode
+
+QMAKE_AR                = emar cqs
+QMAKE_DISTCLEAN            += *.html *.js *.wasm
+
+QT_QPA_DEFAULT_PLATFORM = wasm
+
+QTPLUGIN.platforms = wasm
+load(qt_config)
diff --git a/mkspecs/wasm-emscripten/qplatformdefs.h b/mkspecs/wasm-emscripten/qplatformdefs.h
new file mode 100644
index 0000000000..c1a0d7b1a8
--- /dev/null
+++ b/mkspecs/wasm-emscripten/qplatformdefs.h
@@ -0,0 +1,181 @@
+/****************************************************************************
+**
+** Copyright (C) 2018 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the qmake spec of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or (at your option) the GNU General
+** Public license version 3 or any later version approved by the KDE Free
+** Qt Foundation. The licenses are as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-2.0.html and
+** https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QPLATFORMDEFS_H
+#define QPLATFORMDEFS_H
+
+// Get Qt defines/settings
+
+#include "qglobal.h"
+
+// Set any POSIX/XOPEN defines at the top of this file to turn on specific APIs
+
+// 1) need to reset default environment if _BSD_SOURCE is defined
+// 2) need to specify POSIX thread interfaces explicitly in glibc 2.0
+// 3) it seems older glibc need this to include the X/Open stuff
+
+#include <unistd.h>
+
+// We are hot - unistd.h should have turned on the specific APIs we requested
+
+#include <features.h>
+#include <pthread.h>
+#include <dirent.h>
+#include <fcntl.h>
+#include <grp.h>
+#include <pwd.h>
+#include <signal.h>
+#include <dlfcn.h>
+
+#include <sys/types.h>
+#include <sys/ioctl.h>
+#include <sys/ipc.h>
+#include <sys/time.h>
+#include <sys/socket.h>
+#include <sys/stat.h>
+#include <sys/wait.h>
+
+#ifndef QT_NO_IPV6IFNAME
+#include <net/if.h>
+#endif
+
+#ifndef _GNU_SOURCE
+#  define _GNU_SOURCE
+#endif
+
+#ifdef QT_LARGEFILE_SUPPORT
+#define QT_STATBUF              struct stat64
+#define QT_STATBUF4TSTAT        struct stat64
+#define QT_STAT                 ::stat64
+#define QT_FSTAT                ::fstat64
+#define QT_LSTAT                ::lstat64
+#define QT_OPEN                 ::open64
+#define QT_TRUNCATE             ::truncate64
+#define QT_FTRUNCATE            ::ftruncate64
+#define QT_LSEEK                ::lseek64
+#else
+#define QT_STATBUF              struct stat
+#define QT_STATBUF4TSTAT        struct stat
+#define QT_STAT                 ::stat
+#define QT_FSTAT                ::fstat
+#define QT_LSTAT                ::lstat
+#define QT_OPEN                 ::open
+#define QT_TRUNCATE             ::truncate
+#define QT_FTRUNCATE            ::ftruncate
+#define QT_LSEEK                ::lseek
+#endif
+
+#ifdef QT_LARGEFILE_SUPPORT
+#define QT_FOPEN                ::fopen64
+#define QT_FSEEK                ::fseeko64
+#define QT_FTELL                ::ftello64
+#define QT_FGETPOS              ::fgetpos64
+#define QT_FSETPOS              ::fsetpos64
+#define QT_MMAP                 ::mmap64
+#define QT_FPOS_T               fpos64_t
+#define QT_OFF_T                off64_t
+#else
+#define QT_FOPEN                ::fopen
+#define QT_FSEEK                ::fseek
+#define QT_FTELL                ::ftell
+#define QT_FGETPOS              ::fgetpos
+#define QT_FSETPOS              ::fsetpos
+#define QT_MMAP                 ::mmap
+#define QT_FPOS_T               fpos_t
+#define QT_OFF_T                long
+#endif
+
+#define QT_STAT_REG             S_IFREG
+#define QT_STAT_DIR             S_IFDIR
+#define QT_STAT_MASK            S_IFMT
+#define QT_STAT_LNK             S_IFLNK
+#define QT_SOCKET_CONNECT       ::connect
+#define QT_SOCKET_BIND          ::bind
+#define QT_FILENO               fileno
+#define QT_CLOSE                ::close
+#define QT_READ                 ::read
+#define QT_WRITE                ::write
+#define QT_ACCESS               ::access
+#define QT_GETCWD               ::getcwd
+#define QT_CHDIR                ::chdir
+#define QT_MKDIR                ::mkdir
+#define QT_RMDIR                ::rmdir
+#define QT_OPEN_LARGEFILE       O_LARGEFILE
+#define QT_OPEN_RDONLY          O_RDONLY
+#define QT_OPEN_WRONLY          O_WRONLY
+#define QT_OPEN_RDWR            O_RDWR
+#define QT_OPEN_CREAT           O_CREAT
+#define QT_OPEN_TRUNC           O_TRUNC
+#define QT_OPEN_APPEND          O_APPEND
+#define QT_OPEN_EXCL            O_EXCL
+
+// Directory iteration
+#define QT_DIR                  DIR
+
+#define QT_OPENDIR              ::opendir
+#define QT_CLOSEDIR             ::closedir
+
+#if defined(QT_LARGEFILE_SUPPORT) \
+        && defined(QT_USE_XOPEN_LFS_EXTENSIONS) \
+        && !defined(QT_NO_READDIR64)
+#define QT_DIRENT               struct dirent64
+#define QT_READDIR              ::readdir64
+#define QT_READDIR_R            ::readdir64_r
+#else
+#define QT_DIRENT               struct dirent
+#define QT_READDIR              ::readdir
+#define QT_READDIR_R            ::readdir_r
+#endif
+
+#define QT_SOCKET_CONNECT       ::connect
+#define QT_SOCKET_BIND          ::bind
+
+
+#define QT_SIGNAL_RETTYPE       void
+#define QT_SIGNAL_ARGS          int
+#define QT_SIGNAL_IGNORE        SIG_IGN
+
+#define QT_SOCKLEN_T            socklen_t
+
+#if defined(_XOPEN_SOURCE) && (_XOPEN_SOURCE >= 500)
+#define QT_SNPRINTF             ::snprintf
+#define QT_VSNPRINTF            ::vsnprintf
+#endif
+
+#endif // QPLATFORMDEFS_H