glapi: Generate GL API marshalling code from the XML.

This is not yet used in the build, just generated.

v2: Add missing build dependencies.
v3: Avoid mixing declarations and code, remove logic for avoiding emitting
    code that the compiler's optimizer can deal with anyway.
v4: (Timothy Arceri) move safe_mul() genereation here from a later patch.

Acked-by: Timothy Arceri <tarceri@itsqueeze.com>
Acked-by: Marek Olšák <maraeo@gmail.com>
Tested-by: Dieter Nützel <Dieter@nuetzel-hh.de>
Tested-by: Mike Lothian <mike@fireburn.co.uk>

4 files changed, 488 insertions, 0 deletions

diff --git a/src/mapi/glapi/gen/Makefile.am b/src/mapi/glapi/gen/Makefile.am
index 079b1bb225..1375855858 100644
--- a/src/mapi/glapi/gen/Makefile.am
+++ b/src/mapi/glapi/gen/Makefile.am
@@ -54,6 +54,8 @@ BUILT_SOURCES = \
 	$(MESA_GLAPI_ASM_OUTPUTS) \
 	$(MESA_DIR)/main/enums.c \
 	$(MESA_DIR)/main/api_exec.c \
+	$(MESA_DIR)/main/marshal_generated.c \
+	$(MESA_DIR)/main/marshal_generated.h \
 	$(MESA_DIR)/main/dispatch.h \
 	$(MESA_DIR)/main/remap_helper.h \
 	$(MESA_GLX_DIR)/indirect.c \
@@ -287,6 +289,12 @@ $(MESA_DIR)/main/enums.c: gl_enums.py $(srcdir)/../registry/gl.xml
 $(MESA_DIR)/main/api_exec.c: gl_genexec.py apiexec.py $(COMMON)
 	$(PYTHON_GEN) $(srcdir)/gl_genexec.py -f $(srcdir)/gl_and_es_API.xml > $@
 
+$(MESA_DIR)/main/marshal_generated.c: gl_marshal.py marshal_XML.py $(COMMON)
+	$(PYTHON_GEN) $< -f $(srcdir)/gl_and_es_API.xml > $@
+
+$(MESA_DIR)/main/marshal_generated.h: gl_marshal_h.py marshal_XML.py $(COMMON)
+	$(PYTHON_GEN) $< -f $(srcdir)/gl_and_es_API.xml > $@
+
 $(MESA_DIR)/main/dispatch.h: gl_table.py $(COMMON)
 	$(PYTHON_GEN) $(srcdir)/gl_table.py -f $(srcdir)/gl_and_es_API.xml -m remap_table > $@
 
diff --git a/src/mapi/glapi/gen/gl_marshal.py b/src/mapi/glapi/gen/gl_marshal.py
new file mode 100644
index 0000000000..b7e05acb13
--- /dev/null
+++ b/src/mapi/glapi/gen/gl_marshal.py
@@ -0,0 +1,298 @@
+#!/usr/bin/env python
+
+# Copyright (C) 2012 Intel Corporation
+#
+# Permission is hereby granted, free of charge, to any person obtaining a
+# copy of this software and associated documentation files (the "Software"),
+# to deal in the Software without restriction, including without limitation
+# the rights to use, copy, modify, merge, publish, distribute, sublicense,
+# and/or sell copies of the Software, and to permit persons to whom the
+# Software is furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice (including the next
+# paragraph) shall be included in all copies or substantial portions of the
+# Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+# THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+# FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+# IN THE SOFTWARE.
+
+import contextlib
+import getopt
+import gl_XML
+import license
+import marshal_XML
+import sys
+
+header = """
+#include "api_exec.h"
+#include "context.h"
+#include "dispatch.h"
+#include "glthread.h"
+#include "marshal.h"
+#include "marshal_generated.h"
+"""
+
+
+current_indent = 0
+
+
+def out(str):
+    if str:
+        print ' '*current_indent + str
+    else:
+        print ''
+
+
+@contextlib.contextmanager
+def indent(delta = 3):
+    global current_indent
+    current_indent += delta
+    yield
+    current_indent -= delta
+
+
+class PrintCode(gl_XML.gl_print_base):
+    def __init__(self):
+        super(PrintCode, self).__init__()
+
+        self.name = 'gl_marshal.py'
+        self.license = license.bsd_license_template % (
+            'Copyright (C) 2012 Intel Corporation', 'INTEL CORPORATION')
+
+    def printRealHeader(self):
+        print header
+        print '#include <X11/Xlib-xcb.h>'
+        print
+        print 'static _X_INLINE int safe_mul(int a, int b)'
+        print '{'
+        print '    if (a < 0 || b < 0) return -1;'
+        print '    if (a == 0 || b == 0) return 0;'
+        print '    if (a > INT_MAX / b) return -1;'
+        print '    return a * b;'
+        print '}'
+        print
+
+    def printRealFooter(self):
+        pass
+
+    def print_sync_call(self, func):
+        call = 'CALL_{0}(ctx->CurrentServerDispatch, ({1}))'.format(
+            func.name, func.get_called_parameter_string())
+        if func.return_type == 'void':
+            out('{0};'.format(call))
+        else:
+            out('return {0};'.format(call))
+
+    def print_sync_dispatch(self, func):
+        out('_mesa_glthread_finish(ctx);')
+        self.print_sync_call(func)
+
+    def print_sync_body(self, func):
+        out('/* {0}: marshalled synchronously */'.format(func.name))
+        out('static {0} GLAPIENTRY'.format(func.return_type))
+        out('_mesa_marshal_{0}({1})'.format(func.name, func.get_parameter_string()))
+        out('{')
+        with indent():
+            out('GET_CURRENT_CONTEXT(ctx);')
+            out('_mesa_glthread_finish(ctx);')
+            out('debug_print_sync("{0}");'.format(func.name))
+            self.print_sync_call(func)
+        out('}')
+        out('')
+        out('')
+
+    def print_async_dispatch(self, func):
+        out('cmd = _mesa_glthread_allocate_command(ctx, '
+            'DISPATCH_CMD_{0}, cmd_size);'.format(func.name))
+        for p in func.fixed_params:
+            if p.count:
+                out('memcpy(cmd->{0}, {0}, {1});'.format(
+                        p.name, p.size_string()))
+            else:
+                out('cmd->{0} = {0};'.format(p.name))
+        if func.variable_params:
+            out('char *variable_data = (char *) (cmd + 1);')
+            for p in func.variable_params:
+                out(('memcpy(variable_data, {0}, {1});').format(
+                        p.name, p.size_string(False)))
+                out('variable_data += {0};'.format(
+                        p.size_string(False)))
+        if not func.fixed_params and not func.variable_params:
+            out('(void) cmd;\n')
+        out('_mesa_post_marshal_hook(ctx);')
+
+    def print_async_struct(self, func):
+        out('struct marshal_cmd_{0}'.format(func.name))
+        out('{')
+        with indent():
+            out('struct marshal_cmd_base cmd_base;')
+            for p in func.fixed_params:
+                if p.count:
+                    out('{0} {1}[{2}];'.format(
+                            p.get_base_type_string(), p.name, p.count))
+                else:
+                    out('{0} {1};'.format(p.type_string(), p.name))
+            for p in func.variable_params:
+                if p.count_scale != 1:
+                    out(('/* Next {0} bytes are '
+                         '{1} {2}[{3}][{4}] */').format(
+                            p.size_string(), p.get_base_type_string(),
+                            p.name, p.counter, p.count_scale))
+                else:
+                    out(('/* Next {0} bytes are '
+                         '{1} {2}[{3}] */').format(
+                            p.size_string(), p.get_base_type_string(),
+                            p.name, p.counter))
+        out('};')
+
+    def print_async_unmarshal(self, func):
+        out('static inline void')
+        out(('_mesa_unmarshal_{0}(struct gl_context *ctx, '
+             'const struct marshal_cmd_{0} *cmd)').format(func.name))
+        out('{')
+        with indent():
+            for p in func.fixed_params:
+                if p.count:
+                    out('const {0} * {1} = cmd->{1};'.format(
+                            p.get_base_type_string(), p.name))
+                else:
+                    out('const {0} {1} = cmd->{1};'.format(
+                            p.type_string(), p.name))
+            if func.variable_params:
+                for p in func.variable_params:
+                    out('const {0} * {1};'.format(
+                            p.get_base_type_string(), p.name))
+                out('const char *variable_data = (const char *) (cmd + 1);')
+                for p in func.variable_params:
+                    out('{0} = (const {1} *) variable_data;'.format(
+                            p.name, p.get_base_type_string()))
+                    out('variable_data += {0};'.format(p.size_string(False)))
+            self.print_sync_call(func)
+        out('}')
+
+    def print_async_marshal(self, func):
+        out('static void GLAPIENTRY')
+        out('_mesa_marshal_{0}({1})'.format(
+                func.name, func.get_parameter_string()))
+        out('{')
+        with indent():
+            out('GET_CURRENT_CONTEXT(ctx);')
+            struct = 'struct marshal_cmd_{0}'.format(func.name)
+            size_terms = ['sizeof({0})'.format(struct)]
+            for p in func.variable_params:
+                size_terms.append(p.size_string())
+            out('size_t cmd_size = {0};'.format(' + '.join(size_terms)))
+            out('{0} *cmd;'.format(struct))
+
+            out('debug_print_marshal("{0}");'.format(func.name))
+
+            out('if (cmd_size <= MARSHAL_MAX_CMD_SIZE) {')
+            with indent():
+                self.print_async_dispatch(func)
+            out('} else {')
+            with indent():
+                self.print_sync_dispatch(func)
+            out('}')
+
+        out('}')
+
+    def print_async_body(self, func):
+        out('/* {0}: marshalled asynchronously */'.format(func.name))
+        self.print_async_struct(func)
+        self.print_async_unmarshal(func)
+        self.print_async_marshal(func)
+        out('')
+        out('')
+
+    def print_unmarshal_dispatch_cmd(self, api):
+        out('size_t')
+        out('_mesa_unmarshal_dispatch_cmd(struct gl_context *ctx, '
+            'const void *cmd)')
+        out('{')
+        with indent():
+            out('const struct marshal_cmd_base *cmd_base = cmd;')
+            out('switch (cmd_base->cmd_id) {')
+            for func in api.functionIterateAll():
+                flavor = func.marshal_flavor()
+                if flavor in ('skip', 'sync'):
+                    continue
+                out('case DISPATCH_CMD_{0}:'.format(func.name))
+                with indent():
+                    out('debug_print_unmarshal("{0}");'.format(func.name))
+                    out(('_mesa_unmarshal_{0}(ctx, (const struct marshal_cmd_{0} *)'
+                         ' cmd);').format(func.name))
+                    out('break;')
+            out('default:')
+            with indent():
+                out('assert(!"Unrecognized command ID");')
+                out('break;')
+            out('}')
+            out('')
+            out('return cmd_base->cmd_size;')
+        out('}')
+        out('')
+        out('')
+
+    def print_create_marshal_table(self, api):
+        out('struct _glapi_table *')
+        out('_mesa_create_marshal_table(const struct gl_context *ctx)')
+        out('{')
+        with indent():
+            out('struct _glapi_table *table;')
+            out('')
+            out('table = _mesa_alloc_dispatch_table();')
+            out('if (table == NULL)')
+            with indent():
+                out('return NULL;')
+            out('')
+            for func in api.functionIterateAll():
+                if func.marshal_flavor() == 'skip':
+                    continue
+                out('SET_{0}(table, _mesa_marshal_{0});'.format(func.name))
+            out('')
+            out('return table;')
+        out('}')
+        out('')
+        out('')
+
+    def printBody(self, api):
+        async_funcs = []
+        for func in api.functionIterateAll():
+            flavor = func.marshal_flavor()
+            if flavor in ('skip', 'custom'):
+                continue
+            elif flavor == 'async':
+                self.print_async_body(func)
+                async_funcs.append(func)
+            elif flavor == 'sync':
+                self.print_sync_body(func)
+        self.print_unmarshal_dispatch_cmd(api)
+        self.print_create_marshal_table(api)
+
+
+def show_usage():
+    print 'Usage: %s [-f input_file_name]' % sys.argv[0]
+    sys.exit(1)
+
+
+if __name__ == '__main__':
+    file_name = 'gl_API.xml'
+
+    try:
+        (args, trail) = getopt.getopt(sys.argv[1:], 'm:f:')
+    except Exception,e:
+        show_usage()
+
+    for (arg,val) in args:
+        if arg == '-f':
+            file_name = val
+
+    printer = PrintCode()
+
+    api = gl_XML.parse_GL_API(file_name, marshal_XML.marshal_item_factory())
+    printer.Print(api)
diff --git a/src/mapi/glapi/gen/gl_marshal_h.py b/src/mapi/glapi/gen/gl_marshal_h.py
new file mode 100644
index 0000000000..6e39148d29
--- /dev/null
+++ b/src/mapi/glapi/gen/gl_marshal_h.py
@@ -0,0 +1,86 @@
+#!/usr/bin/env python
+
+# Copyright (C) 2012 Intel Corporation
+#
+# Permission is hereby granted, free of charge, to any person obtaining a
+# copy of this software and associated documentation files (the "Software"),
+# to deal in the Software without restriction, including without limitation
+# the rights to use, copy, modify, merge, publish, distribute, sublicense,
+# and/or sell copies of the Software, and to permit persons to whom the
+# Software is furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice (including the next
+# paragraph) shall be included in all copies or substantial portions of the
+# Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+# THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+# FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+# IN THE SOFTWARE.
+
+import getopt
+import gl_XML
+import license
+import marshal_XML
+import sys
+
+
+header = """
+#ifndef MARSHAL_GENERATABLE_H
+#define MARSHAL_GENERATABLE_H
+"""
+
+footer = """
+#endif /* MARSHAL_GENERATABLE_H */
+"""
+
+
+class PrintCode(gl_XML.gl_print_base):
+    def __init__(self):
+        super(PrintCode, self).__init__()
+
+        self.name = 'gl_marshal_h.py'
+        self.license = license.bsd_license_template % (
+            'Copyright (C) 2012 Intel Corporation', 'INTEL CORPORATION')
+
+    def printRealHeader(self):
+        print header
+
+    def printRealFooter(self):
+        print footer
+
+    def printBody(self, api):
+        print 'enum marshal_dispatch_cmd_id'
+        print '{'
+        for func in api.functionIterateAll():
+            flavor = func.marshal_flavor()
+            if flavor in ('skip', 'sync'):
+                continue
+            print '   DISPATCH_CMD_{0},'.format(func.name)
+        print '};'
+
+
+def show_usage():
+    print 'Usage: %s [-f input_file_name]' % sys.argv[0]
+    sys.exit(1)
+
+
+if __name__ == '__main__':
+    file_name = 'gl_API.xml'
+
+    try:
+        (args, trail) = getopt.getopt(sys.argv[1:], 'm:f:')
+    except Exception,e:
+        show_usage()
+
+    for (arg,val) in args:
+        if arg == '-f':
+            file_name = val
+
+    printer = PrintCode()
+
+    api = gl_XML.parse_GL_API(file_name, marshal_XML.marshal_item_factory())
+    printer.Print(api)
diff --git a/src/mapi/glapi/gen/marshal_XML.py b/src/mapi/glapi/gen/marshal_XML.py
new file mode 100644
index 0000000000..e8ddb7ff8f
--- /dev/null
+++ b/src/mapi/glapi/gen/marshal_XML.py
@@ -0,0 +1,96 @@
+#!/usr/bin/env python
+
+# Copyright (C) 2012 Intel Corporation
+#
+# Permission is hereby granted, free of charge, to any person obtaining a
+# copy of this software and associated documentation files (the "Software"),
+# to deal in the Software without restriction, including without limitation
+# the rights to use, copy, modify, merge, publish, distribute, sublicense,
+# and/or sell copies of the Software, and to permit persons to whom the
+# Software is furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice (including the next
+# paragraph) shall be included in all copies or substantial portions of the
+# Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+# THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+# FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+# IN THE SOFTWARE.
+
+# marshal_XML.py: factory for interpreting XML for the purpose of
+# building thread marshalling code.
+
+import gl_XML
+
+
+class marshal_item_factory(gl_XML.gl_item_factory):
+    """Factory to create objects derived from gl_item containing
+    information necessary to generate thread marshalling code."""
+
+    def create_function(self, element, context):
+        return marshal_function(element, context)
+
+
+class marshal_function(gl_XML.gl_function):
+    def process_element(self, element):
+        # Do normal processing.
+        super(marshal_function, self).process_element(element)
+
+        # Only do further processing when we see the canonical
+        # function name.
+        if element.get('name') != self.name:
+            return
+
+        # Classify fixed and variable parameters.
+        self.fixed_params = []
+        self.variable_params = []
+        for p in self.parameters:
+            if p.is_padding:
+                continue
+            if p.is_variable_length():
+                self.variable_params.append(p)
+            else:
+                self.fixed_params.append(p)
+
+        # Store the "marshal" attribute, if present.
+        self.marshal = element.get('marshal')
+
+    def marshal_flavor(self):
+        """Find out how this function should be marshalled between
+        client and server threads."""
+        # If a "marshal" attribute was present, that overrides any
+        # determination that would otherwise be made by this function.
+        if self.marshal != None:
+            if self.marshal == 'draw':
+                # TODO: as a temporary measure, do draw functions
+                # synchronously, since they may access client memory
+                # via vertex attribute pointers.
+                return 'sync'
+            return self.marshal
+
+        if self.exec_flavor == 'skip':
+            # Functions marked exec="skip" are not yet implemented in
+            # Mesa, so don't bother trying to marshal them.
+            return 'skip'
+
+        if self.return_type != 'void':
+            return 'sync'
+        for p in self.parameters:
+            if p.is_output:
+                return 'sync'
+            if p.is_pointer() and not (p.count or p.counter):
+                return 'sync'
+            if p.count_parameter_list:
+                # Parameter size is determined by enums; haven't
+                # written logic to handle this yet.  TODO: fix.
+                return 'sync'
+            if p.img_null_flag:
+                # Caller is allowed to pass NULL for this parameter;
+                # haven't written logic to handle this yet.  TODO:
+                # fix.
+                return 'sync'
+        return 'async'