nir: Add a data pointer to the callback in nir_remove_dead_variables

Reviewed-by: Rhys Perry <pendingchaos02@gmail.com>
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/8706>

src/compiler/glsl/gl_nir_linker.c

@@ -35,7 +35,7 @@
  */
 
 static bool
-can_remove_uniform(nir_variable *var)
+can_remove_uniform(nir_variable *var, UNUSED void *data)
 {
    /* Section 2.11.6 (Uniform Variables) of the OpenGL ES 3.0.3 spec
     * says:
@@ -603,8 +603,11 @@ gl_nir_link_spirv(struct gl_context *ctx, struct gl_shader_program *prog,
    for (unsigned i = 0; i < MESA_SHADER_STAGES; i++) {
       struct gl_linked_shader *shader = prog->_LinkedShaders[i];
       if (shader) {
+         const nir_remove_dead_variables_options opts = {
+            .can_remove_var = can_remove_uniform,
+         };
          nir_remove_dead_variables(shader->Program->nir, nir_var_uniform,
-                                   &can_remove_uniform);
+                                   &opts);
       }
    }
 
@@ -664,8 +667,11 @@ gl_nir_link_glsl(struct gl_context *ctx, struct gl_shader_program *prog)
    for (unsigned i = 0; i < MESA_SHADER_STAGES; i++) {
       struct gl_linked_shader *shader = prog->_LinkedShaders[i];
       if (shader) {
+         const nir_remove_dead_variables_options opts = {
+            .can_remove_var = can_remove_uniform,
+         };
          nir_remove_dead_variables(shader->Program->nir, nir_var_uniform,
-                                   &can_remove_uniform);
+                                   &opts);
       }
    }
 

src/compiler/nir/nir.h

@@ -4472,8 +4472,15 @@ bool nir_lower_vars_to_ssa(nir_shader *shader);
 
 bool nir_remove_dead_derefs(nir_shader *shader);
 bool nir_remove_dead_derefs_impl(nir_function_impl *impl);
+
+typedef struct nir_remove_dead_variables_options {
+   bool (*can_remove_var)(nir_variable *var, void *data);
+   void *can_remove_var_data;
+} nir_remove_dead_variables_options;
+
 bool nir_remove_dead_variables(nir_shader *shader, nir_variable_mode modes,
-                               bool (*can_remove_var)(nir_variable *var));
+                               const nir_remove_dead_variables_options *options);
+
 bool nir_lower_variable_initializers(nir_shader *shader,
                                      nir_variable_mode modes);
 

src/compiler/nir/nir_remove_dead_variables.c

@@ -152,7 +152,7 @@ remove_dead_var_writes(nir_shader *shader)
 
 static bool
 remove_dead_vars(struct exec_list *var_list, nir_variable_mode modes,
-                 struct set *live, bool (*can_remove_var)(nir_variable *var))
+                 struct set *live, const nir_remove_dead_variables_options *opts)
 {
    bool progress = false;
 
@@ -160,7 +160,8 @@ remove_dead_vars(struct exec_list *var_list, nir_variable_mode modes,
       if (!(var->data.mode & modes))
          continue;
 
-      if (can_remove_var && !can_remove_var(var))
+      if (opts && opts->can_remove_var &&
+          !opts->can_remove_var(var, opts->can_remove_var_data))
          continue;
 
       struct set_entry *entry = _mesa_set_search(live, var);
@@ -177,7 +178,7 @@ remove_dead_vars(struct exec_list *var_list, nir_variable_mode modes,
 
 bool
 nir_remove_dead_variables(nir_shader *shader, nir_variable_mode modes,
-                          bool (*can_remove_var)(nir_variable *var))
+                          const nir_remove_dead_variables_options *opts)
 {
    bool progress = false;
    struct set *live = _mesa_pointer_set_create(NULL);
@@ -186,7 +187,7 @@ nir_remove_dead_variables(nir_shader *shader, nir_variable_mode modes,
 
    if (modes & ~nir_var_function_temp) {
       progress = remove_dead_vars(&shader->variables, modes,
-                                  live, can_remove_var) || progress;
+                                  live, opts) || progress;
    }
 
    if (modes & nir_var_function_temp) {
@@ -194,7 +195,7 @@ nir_remove_dead_variables(nir_shader *shader, nir_variable_mode modes,
          if (function->impl) {
             if (remove_dead_vars(&function->impl->locals,
                                  nir_var_function_temp,
-                                 live, can_remove_var))
+                                 live, opts))
                progress = true;
          }
       }