[Mesa-dev] [PATCH 2/2] mapi: correctly handle the full offset table

[Emil Velikov]

From: Emil Velikov <emil.velikov at collabora.com>

Earlier commit converted ES1 and ES2 to a new, much simpler, dispatch
generator. At the same time, GL/glapi and the driver side are still
using the old code.

There is a hidden ABI between GL*.so and glapi.so, former referencing
entry-points by offset in the _glapi_table. Hence earlier commit added
the full table of entry-points, alongside a marker for other cases like
indirect GL(X) and driver-size remapping.

Yet the patches did not handle things fully, thus it was possible to
get different interpretations of the dispatch table after the marker.

This commit fixes that adding an indicative error message to catch
future bugs.

While here correct the marker (MAX_OFFSETS) comment.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=110302
Fixes: cf317bf0937 ("mapi: add all _glapi_table entrypoints tostatic_data.py")
Signed-off-by: Emil Velikov <emil.velikov at collabora.com>
---
 src/mapi/glapi/gen/gl_XML.py      | 8 ++++++--
 src/mapi/glapi/gen/static_data.py | 2 +-
 2 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/src/mapi/glapi/gen/gl_XML.py b/src/mapi/glapi/gen/gl_XML.py
index 478f82ca314..2854a9a5688 100644
--- a/src/mapi/glapi/gen/gl_XML.py
+++ b/src/mapi/glapi/gen/gl_XML.py
@@ -49,7 +49,7 @@ def parse_GL_API( file_name, factory = None ):
     # that are not part of the ABI.
 
     for func in api.functionIterateByCategory():
-        if func.assign_offset:
+        if func.assign_offset and func.offset < 0:
             func.offset = api.next_offset;
             api.next_offset += 1
 
@@ -683,8 +683,12 @@ class gl_function( gl_item ):
 
             if name in static_data.offsets and static_data.offsets[name] <= static_data.MAX_OFFSETS:
                 self.offset = static_data.offsets[name]
+            elif name in static_data.offsets and static_data.offsets[name] > static_data.MAX_OFFSETS:
+                self.offset = static_data.offsets[name]
+                self.assign_offset = True
             else:
-                self.offset = -1
+                if self.exec_flavor != "skip":
+                    raise RuntimeError("Entry-point %s is missing offset in static_data.py. Add one at the bottom of the list." % (name))
                 self.assign_offset = self.exec_flavor != "skip" or name in static_data.unused_functions
 
         if not self.name:
diff --git a/src/mapi/glapi/gen/static_data.py b/src/mapi/glapi/gen/static_data.py
index dc1926327da..5044e0f78cf 100644
--- a/src/mapi/glapi/gen/static_data.py
+++ b/src/mapi/glapi/gen/static_data.py
@@ -29,7 +29,7 @@ MAX_OFFSETS = 407
 """Table of functions that have ABI-mandated offsets in the dispatch table.
 
 The first MAX_OFFSETS entries are required by indirect GLX. The rest are
-required to preserve the glapi <> drivers ABI. This is to be addressed shortly.
+required to preserve the glapi <> GL/GLES ABI. This is to be addressed shortly.
 
 This list will never change."""
 offsets = {
-- 
2.20.1