[Mesa-dev] [PATCH] mesa: Fix setup of LocalParams array.

[Eric Anholt]

i965 passed piglit, but swrast and gallium both segfaulted without this.
i965 happened to work because it never ran _mesa_load_state_parameters()
on the new program before the test called glProgramLocalParameter(), which
was allocating a LocalParams array for the fallback path.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=71734

v2: Since v1 threw away old localparams data, leaked old LocalParams
    memory, only fixed fragment programs, and I was dubious of my previous
    invariants already (nothing but program_parse.y will generate
    LocalParams, and only that one path of program_parse.y will), just
    late-allocate localparams at the other point of dereferencing them.
    This adds overhead to _mesa_load_state_parameter, which is
    uncomfortable, but I'm pretty sure that giant switch statement is
    super slow already.
---
 src/mesa/program/prog_statevars.c | 14 ++++++++++++++
 src/mesa/program/program_parse.y  |  7 -------
 2 files changed, 14 insertions(+), 7 deletions(-)

diff --git a/src/mesa/program/prog_statevars.c b/src/mesa/program/prog_statevars.c
index f6fd535..58e1f49 100644
--- a/src/mesa/program/prog_statevars.c
+++ b/src/mesa/program/prog_statevars.c
@@ -368,6 +368,13 @@ _mesa_fetch_state(struct gl_context *ctx, const gl_state_index state[],
                COPY_4V(value, ctx->FragmentProgram.Parameters[idx]);
                return;
             case STATE_LOCAL:
+               if (!ctx->FragmentProgram.Current->Base.LocalParams) {
+                  ctx->FragmentProgram.Current->Base.LocalParams =
+                     calloc(MAX_PROGRAM_LOCAL_PARAMS, sizeof(float[4]));
+                  if (!ctx->FragmentProgram.Current->Base.LocalParams)
+                     return;
+               }
+
                COPY_4V(value, ctx->FragmentProgram.Current->Base.LocalParams[idx]);
                return;
             default:
@@ -387,6 +394,13 @@ _mesa_fetch_state(struct gl_context *ctx, const gl_state_index state[],
                COPY_4V(value, ctx->VertexProgram.Parameters[idx]);
                return;
             case STATE_LOCAL:
+               if (!ctx->VertexProgram.Current->Base.LocalParams) {
+                  ctx->VertexProgram.Current->Base.LocalParams =
+                     calloc(MAX_PROGRAM_LOCAL_PARAMS, sizeof(float[4]));
+                  if (!ctx->VertexProgram.Current->Base.LocalParams)
+                     return;
+               }
+
                COPY_4V(value, ctx->VertexProgram.Current->Base.LocalParams[idx]);
                return;
             default:
diff --git a/src/mesa/program/program_parse.y b/src/mesa/program/program_parse.y
index 03c0a3d..a76db4e 100644
--- a/src/mesa/program/program_parse.y
+++ b/src/mesa/program/program_parse.y
@@ -25,7 +25,6 @@
 #include <stdlib.h>
 #include <string.h>
 
-#include "main/macros.h"
 #include "main/mtypes.h"
 #include "main/imports.h"
 #include "program/program.h"
@@ -2560,12 +2559,6 @@ initialize_symbol_from_param(struct gl_program *prog,
    param_var->type = at_param;
    param_var->param_binding_type = PROGRAM_STATE_VAR;
 
-   /* Dynamically allocate LocalParams, since it's a large array to have
-    * statically in every gl_program otherwise.
-    */
-   if (state_tokens[1] == STATE_LOCAL && !prog->LocalParams)
-      prog->LocalParams = calloc(MAX_PROGRAM_LOCAL_PARAMS, sizeof(float[4]));
-
    /* If we are adding a STATE_ENV or STATE_LOCAL that has multiple elements,
     * we need to unroll it and call add_state_reference() for each row
     */
-- 
1.8.4.rc3