vulkan/util: Add generator for enum_to_str functions

This adds a python generator to produce enum_to_str functions for
Vulkan from the vk.xml API description. It supports extensions as well
as core API features, and the generator works with both python2 and
python3.

Signed-off-by: Dylan Baker <[email protected]>
Acked-by: Matt Turner <[email protected]>
Acked-by: Jason Ekstrand <[email protected]>

3 files changed, 195 insertions, 0 deletions

diff --git a/src/vulkan/util/.gitignore b/src/vulkan/util/.gitignore
new file mode 100644
index 00000000000..5c79217982b
--- /dev/null
+++ b/src/vulkan/util/.gitignore
@@ -0,0 +1 @@
+vk_enum_to_str.*
diff --git a/src/vulkan/util/Makefile.am b/src/vulkan/util/Makefile.am
new file mode 100644
index 00000000000..87c96d5e5bb
--- /dev/null
+++ b/src/vulkan/util/Makefile.am
@@ -0,0 +1,22 @@
+vulkan_api_xml = $(top_srcdir)/src/vulkan/registry/vk.xml
+
+AM_CPPFLAGS = \
+	-I$(top_srcdir)/include \
+	-I$(top_srcdir)/src
+
+EXTRA_DIST = \
+	gen_enum_to_str.py
+
+BUILT_SOURCES = \
+	vk_enum_to_str.c \
+	vk_enum_to_str.h
+
+vk_enum_to_str.c vk_enum_to_str.h: gen_enum_to_str.py $(vulkan_api_xml)
+	$(AM_V_GEN)$(PYTHON2) $(srcdir)/gen_enum_to_str.py
+
+noinst_LTLIBRARIES = libvulkan_util.la
+
+libvulkan_util_la_SOURCES = \
+	vk_enum_to_str.c \
+	vk_enum_to_str.h
+
diff --git a/src/vulkan/util/gen_enum_to_str.py b/src/vulkan/util/gen_enum_to_str.py
new file mode 100644
index 00000000000..0564b8e0280
--- /dev/null
+++ b/src/vulkan/util/gen_enum_to_str.py
@@ -0,0 +1,172 @@
+# encoding=utf-8
+# Copyright © 2017 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 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.
+
+"""Create enum to string functions for vulking using vk.xml."""
+
+from __future__ import print_function
+import os
+import textwrap
+import xml.etree.cElementTree as et
+
+from mako.template import Template
+
+VK_XML = os.path.join(os.path.dirname(__file__), '..', 'registry', 'vk.xml')
+
+COPYRIGHT = textwrap.dedent(u"""\
+    * Copyright © 2017 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 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.""")
+
+C_TEMPLATE = Template(textwrap.dedent(u"""\
+    /* Autogenerated file -- do not edit
+     * generated by ${file}
+     *
+     ${copyright}
+     */
+
+    #include <vulkan/vulkan.h>
+    #include "util/macros.h"
+    #include "vk_enum_to_str.h"
+
+    % for enum in enums:
+
+        const char *
+        vk_${enum.name[2:]}_to_str(${enum.name} input)
+        {
+            switch(input) {
+            % for v in enum.values:
+                case ${v}:
+                    return "${v}";
+            % endfor
+            default:
+                unreachable("Undefined enum value.");
+            }
+        }
+    %endfor"""),
+    output_encoding='utf-8')
+
+H_TEMPLATE = Template(textwrap.dedent(u"""\
+    /* Autogenerated file -- do not edit
+     * generated by ${file}
+     *
+     ${copyright}
+     */
+
+    #ifndef MESA_VK_ENUM_TO_STR_H
+    #define MESA_VK_ENUM_TO_STR_H
+
+    #include <vulkan/vulkan.h>
+
+    % for enum in enums:
+        const char * vk_${enum.name[2:]}_to_str(${enum.name} input);
+    % endfor
+
+    #endif"""),
+    output_encoding='utf-8')
+
+
+class EnumFactory(object):
+    """Factory for creating enums."""
+
+    def __init__(self, type_):
+        self.registry = {}
+        self.type = type_
+
+    def __call__(self, name):
+        try:
+            return self.registry[name]
+        except KeyError:
+            n = self.registry[name] = self.type(name)
+        return n
+
+
+class VkEnum(object):
+    """Simple struct-like class representing a single Vulkan Enum."""
+
+    def __init__(self, name, values=None):
+        self.name = name
+        self.values = values or []
+
+
+def xml_parser(filename):
+    """Parse the XML file and return parsed data.
+
+    This parser is a memory efficient iterative XML parser that returns a list
+    of VkEnum objects.
+    """
+    efactory = EnumFactory(VkEnum)
+
+    with open(filename, 'rb') as f:
+        context = iter(et.iterparse(f, events=('start', 'end')))
+
+        # This gives the root element, since goal is to iterate over the
+        # elements without building a tree, this allows the root to be cleared
+        # (erase the elements) after the children have been processed.
+        _, root = next(context)
+
+        for event, elem in context:
+            if event == 'end' and elem.tag == 'enums':
+                type_ = elem.attrib.get('type')
+                if type_ == 'enum':
+                    enum = efactory(elem.attrib['name'])
+                    enum.values.extend([e.attrib['name'] for e in elem
+                                        if e.tag == 'enum'])
+            elif event == 'end' and elem.tag == 'extension':
+                if elem.attrib['supported'] != 'vulkan':
+                    continue
+                for e in elem.findall('.//enum[@extends][@offset]'):
+                    enum = efactory(e.attrib['extends'])
+                    enum.values.append(e.attrib['name'])
+
+            root.clear()
+
+    return efactory.registry.values()
+
+
+def main():
+    enums = xml_parser(VK_XML)
+    for template, file_ in [(C_TEMPLATE, 'vk_enum_to_str.c'),
+                            (H_TEMPLATE, 'vk_enum_to_str.h')]:
+        with open(file_, 'wb') as f:
+            f.write(template.render(
+                file=os.path.basename(__file__),
+                enums=enums,
+                copyright=COPYRIGHT))
+
+
+if __name__ == '__main__':
+    main()