Overhaul of error handling.

11 files changed, 128 insertions, 223 deletions

diff --git a/src/mesa/shader/slang/slang_codegen.c b/src/mesa/shader/slang/slang_codegen.c
index d239a97500d..efd330106be 100644
--- a/src/mesa/shader/slang/slang_codegen.c
+++ b/src/mesa/shader/slang/slang_codegen.c
@@ -47,7 +47,6 @@
 #include "slang_typeinfo.h"
 #include "slang_codegen.h"
 #include "slang_compile.h"
-#include "slang_error.h"
 #include "slang_label.h"
 #include "slang_simplify.h"
 #include "slang_emit.h"
@@ -1154,7 +1153,7 @@ make_writemask(const char *field)
  */
 static slang_ir_node *
 _slang_gen_asm(slang_assemble_ctx *A, slang_operation *oper,
-                   slang_operation *dest)
+               slang_operation *dest)
 {
    const slang_asm_info *info;
    slang_ir_node *kids[3], *n;
@@ -1280,15 +1279,15 @@ _slang_gen_function_call_name(slang_assemble_ctx *A, const char *name,
     * Use 'name' to find the function to call
     */
    fun = _slang_locate_function(A->space.funcs, atom, params, param_count,
-				&A->space, A->atoms);
+				&A->space, A->atoms, A->log);
    if (!fun) {
       /* A function with exactly the right parameters/types was not found.
        * Try adapting the parameters.
        */
       fun = _slang_first_function(A->space.funcs, name);
-      if (!_slang_adapt_call(oper, fun, &A->space, A->atoms)) {
-         RETURN_ERROR2("Undefined function (or no matching parameters)",
-                       name, 0);
+      if (!_slang_adapt_call(oper, fun, &A->space, A->atoms, A->log)) {
+         slang_info_log_error(A->log, "Undefined function '%s'", name);
+         return NULL;
       }
       assert(fun);
    }
@@ -1361,7 +1360,8 @@ _slang_gen_while(slang_assemble_ctx * A, const slang_operation *oper)
    if (loop->BranchNode == 0 && isConst && constTrue) {
       /* infinite loop detected */
       A->CurLoop = prevLoop; /* clean-up */
-      RETURN_ERROR("Infinite loop detected!", 0);
+      slang_info_log_error(A->log, "Infinite loop detected!");
+      return NULL;
    }
 
    /* pop loop, restore prev */
@@ -1816,7 +1816,8 @@ _slang_gen_declaration(slang_assemble_ctx *A, slang_operation *oper)
       assert(oper->num_children == 1);
       var = new_var(A, oper, oper->a_id);
       if (!var) {
-         RETURN_ERROR2("Undefined variable:", varName, 0);
+         slang_info_log_error(A->log, "undefined variable '%s'", varName);
+         return NULL;
       }
       /* XXX make copy of this initializer? */
       rhs = _slang_gen_operation(A, &oper->children[0]);
@@ -1829,7 +1830,8 @@ _slang_gen_declaration(slang_assemble_ctx *A, slang_operation *oper)
       slang_ir_node *var, *init, *rhs;
       var = new_var(A, oper, oper->a_id);
       if (!var) {
-         RETURN_ERROR2("Undefined variable:", varName, 0);
+         slang_info_log_error(A->log, "undefined variable '%s'", varName);
+         return NULL;
       }
 #if 0
       /* XXX make copy of this initializer? */
@@ -1870,7 +1872,8 @@ _slang_gen_variable(slang_assemble_ctx * A, slang_operation *oper)
    slang_atom aVar = oper->var ? oper->var->a_name : oper->a_id;
    slang_ir_node *n = new_var(A, oper, aVar);
    if (!n) {
-      RETURN_ERROR2("Undefined variable:", (char *) aVar, 0);
+      slang_info_log_error(A->log, "undefined variable '%s'", (char *) aVar);
+      return NULL;
    }
    return n;
 }
@@ -2045,7 +2048,7 @@ _slang_gen_field(slang_assemble_ctx * A, slang_operation *oper)
       slang_ir_node *n;
       GLuint swizzle;
       if (!_slang_is_swizzle((char *) oper->a_id, rows, &swz)) {
-         RETURN_ERROR("Bad swizzle", 0);
+         slang_info_log_error(A->log, "Bad swizzle");
       }
       swizzle = MAKE_SWIZZLE4(swz.swizzle[0],
                               swz.swizzle[1],
@@ -2063,7 +2066,7 @@ _slang_gen_field(slang_assemble_ctx * A, slang_operation *oper)
       slang_ir_node *n;
       GLuint swizzle;
       if (!_slang_is_swizzle((char *) oper->a_id, rows, &swz)) {
-         RETURN_ERROR("Bad swizzle", 0);
+         slang_info_log_error(A->log, "Bad swizzle");
       }
       swizzle = MAKE_SWIZZLE4(swz.swizzle[0],
                               swz.swizzle[1],
@@ -2122,7 +2125,7 @@ _slang_gen_subscript(slang_assemble_ctx * A, slang_operation *oper)
       index = (GLint) oper->children[1].literal[0];
       if (oper->children[1].type != SLANG_OPER_LITERAL_INT ||
           index >= max) {
-         RETURN_ERROR("Invalid array index for vector type", 0);
+         slang_info_log_error(A->log, "Invalid array index for vector type");
       }
 
       n = _slang_gen_operation(A, &oper->children[0]);
@@ -2243,12 +2246,12 @@ _slang_gen_operation(slang_assemble_ctx * A, slang_operation *oper)
       return _slang_gen_while(A, oper);
    case SLANG_OPER_BREAK:
       if (!A->CurLoop) {
-         RETURN_ERROR("'break' not in loop", 0);
+         slang_info_log_error(A->log, "'break' not in loop");
       }
       return new_break(A->CurLoop);
    case SLANG_OPER_CONTINUE:
       if (!A->CurLoop) {
-         RETURN_ERROR("'continue' not in loop", 0);
+         slang_info_log_error(A->log, "'continue' not in loop");
       }
       return new_cont(A->CurLoop);
    case SLANG_OPER_DISCARD:
@@ -2621,7 +2624,7 @@ _slang_codegen_global_variable(slang_assemble_ctx *A, slang_variable *var,
          n = new_seq(n, init);
       }
 
-      success = _slang_emit_code(n, A->vartable, A->program, GL_FALSE);
+      success = _slang_emit_code(n, A->vartable, A->program, GL_FALSE, A->log);
 
       _slang_free_ir_tree(n);
    }
@@ -2709,7 +2712,7 @@ _slang_codegen_function(slang_assemble_ctx * A, slang_function * fun)
 #endif
 
    /* Emit program instructions */
-   success = _slang_emit_code(n, A->vartable, A->program, GL_TRUE);
+   success = _slang_emit_code(n, A->vartable, A->program, GL_TRUE, A->log);
    _slang_free_ir_tree(n);
 
    /* free codegen context */
diff --git a/src/mesa/shader/slang/slang_compile.c b/src/mesa/shader/slang/slang_compile.c
index a1cae5d338d..1a4c7d31f16 100644
--- a/src/mesa/shader/slang/slang_compile.c
+++ b/src/mesa/shader/slang/slang_compile.c
@@ -37,8 +37,8 @@
 #include "slang_compile.h"
 #include "slang_preprocess.h"
 #include "slang_storage.h"
-#include "slang_error.h"
 #include "slang_emit.h"
+#include "slang_log.h"
 #include "slang_vartable.h"
 #include "slang_simplify.h"
 
@@ -115,110 +115,6 @@ _slang_code_object_dtr(slang_code_object * self)
    slang_atom_pool_destruct(&self->atompool);
 }
 
-/* slang_info_log */
-
-static char *out_of_memory = "Error: Out of memory.\n";
-
-void
-slang_info_log_construct(slang_info_log * log)
-{
-   log->text = NULL;
-   log->dont_free_text = 0;
-}
-
-void
-slang_info_log_destruct(slang_info_log * log)
-{
-   if (!log->dont_free_text)
-      slang_alloc_free(log->text);
-}
-
-static int
-slang_info_log_message(slang_info_log * log, const char *prefix,
-                       const char *msg)
-{
-   GLuint size;
-
-   if (log->dont_free_text)
-      return 0;
-   size = slang_string_length(msg) + 2;
-   if (prefix != NULL)
-      size += slang_string_length(prefix) + 2;
-   if (log->text != NULL) {
-      GLuint old_len = slang_string_length(log->text);
-      log->text = (char *)
-	 slang_alloc_realloc(log->text, old_len + 1, old_len + size);
-   }
-   else {
-      log->text = (char *) (slang_alloc_malloc(size));
-      if (log->text != NULL)
-         log->text[0] = '\0';
-   }
-   if (log->text == NULL)
-      return 0;
-   if (prefix != NULL) {
-      slang_string_concat(log->text, prefix);
-      slang_string_concat(log->text, ": ");
-   }
-   slang_string_concat(log->text, msg);
-   slang_string_concat(log->text, "\n");
-#if 1
-   abort(); /* XXX temporary */
-#endif
-   return 1;
-}
-
-int
-slang_info_log_print(slang_info_log * log, const char *msg, ...)
-{
-   va_list va;
-   char buf[1024];
-
-   va_start(va, msg);
-   _mesa_vsprintf(buf, msg, va);
-   va_end(va);
-   return slang_info_log_message(log, NULL, buf);
-}
-
-int
-slang_info_log_error(slang_info_log * log, const char *msg, ...)
-{
-   va_list va;
-   char buf[1024];
-
-   va_start(va, msg);
-   _mesa_vsprintf(buf, msg, va);
-   va_end(va);
-   if (slang_info_log_message(log, "Error", buf))
-      return 1;
-   slang_info_log_memory(log);
-   return 0;
-}
-
-int
-slang_info_log_warning(slang_info_log * log, const char *msg, ...)
-{
-   va_list va;
-   char buf[1024];
-
-   va_start(va, msg);
-   _mesa_vsprintf(buf, msg, va);
-   va_end(va);
-   if (slang_info_log_message(log, "Warning", buf))
-      return 1;
-   slang_info_log_memory(log);
-   return 0;
-}
-
-void
-slang_info_log_memory(slang_info_log * log)
-{
-   if (!slang_info_log_message(log, "Error", "Out of memory.")) {
-      log->dont_free_text = 1;
-      log->text = out_of_memory;
-   }
-   abort(); /* XXX temporary */
-}
 
 /* slang_parse_ctx */
 
@@ -1838,8 +1734,7 @@ parse_function(slang_parse_ctx * C, slang_output_ctx * O, int definition,
       A.space.vars = O->vars;
       A.program = O->program;
       A.vartable = O->vartable;
-
-      _slang_reset_error();
+      A.log = C->L;
 
       _slang_codegen_function(&A, *parsed_func_ret);
    }
@@ -2002,7 +1897,7 @@ compile_with_grammar(grammar id, const char *source, slang_code_unit * unit,
       slang_string_free(&preprocessed);
       grammar_get_last_error((byte *) (buf), sizeof(buf), &pos);
       slang_info_log_error(infolog, buf);
-      RETURN_ERROR("syntax error (possibly in library code)", 0);
+      /* syntax error (possibly in library code) */
    }
    slang_string_free(&preprocessed);
 
@@ -2175,7 +2070,7 @@ _slang_compile(GLcontext *ctx, struct gl_shader *shader)
 
    success = compile_shader(ctx, &obj, type, &info_log, shader);
 
-   if (success) {
+   if (success && !info_log.text) {
 #if 0
       slang_create_uniforms(&object->expdata, shader);
       _mesa_print_program(program);
@@ -2183,6 +2078,7 @@ _slang_compile(GLcontext *ctx, struct gl_shader *shader)
 #endif
    }
    else {
+      success = GL_FALSE;
       /* XXX more work on info log needed here */
       if (info_log.text) {
          if (shader->InfoLog) {
diff --git a/src/mesa/shader/slang/slang_compile.h b/src/mesa/shader/slang/slang_compile.h
index 7abb92bd3b5..086e2d8dc4d 100644
--- a/src/mesa/shader/slang/slang_compile.h
+++ b/src/mesa/shader/slang/slang_compile.h
@@ -88,19 +88,6 @@ _slang_code_object_ctr (slang_code_object *);
 extern GLvoid
 _slang_code_object_dtr (slang_code_object *);
 
-typedef struct slang_info_log_
-{
-	char *text;
-	int dont_free_text;
-} slang_info_log;
-
-void slang_info_log_construct (slang_info_log *);
-void slang_info_log_destruct (slang_info_log *);
-int slang_info_log_print (slang_info_log *, const char *, ...);
-int slang_info_log_error (slang_info_log *, const char *, ...);
-int slang_info_log_warning (slang_info_log *, const char *, ...);
-void slang_info_log_memory (slang_info_log *);
-
 extern GLboolean
 _slang_compile (GLcontext *ctx, struct gl_shader *shader);
 
diff --git a/src/mesa/shader/slang/slang_emit.c b/src/mesa/shader/slang/slang_emit.c
index f5b6fb4d65e..b0776e93407 100644
--- a/src/mesa/shader/slang/slang_emit.c
+++ b/src/mesa/shader/slang/slang_emit.c
@@ -45,7 +45,6 @@
 #include "prog_print.h"
 #include "slang_builtin.h"
 #include "slang_emit.h"
-#include "slang_error.h"
 
 
 #define PEEPHOLE_OPTIMIZATIONS 1
@@ -1421,14 +1420,20 @@ emit(slang_emit_info *emitInfo, slang_ir_node *n)
       assert(n->Store->Index < 0);
       if (!n->Var || n->Var->isTemp) {
          /* a nameless/temporary variable, will be freed after first use */
-         if (!_slang_alloc_temp(emitInfo->vt, n->Store))
-            RETURN_ERROR("Ran out of registers, too many temporaries", 0);
+         if (!_slang_alloc_temp(emitInfo->vt, n->Store)) {
+            slang_info_log_error(emitInfo->log,
+                                 "Ran out of registers, too many temporaries");
+            return NULL;
+         }
       }
       else {
          /* a regular variable */
          _slang_add_variable(emitInfo->vt, n->Var);
-         if (!_slang_alloc_var(emitInfo->vt, n->Store))
-            RETURN_ERROR("Ran out of registers, too many variables", 0);
+         if (!_slang_alloc_var(emitInfo->vt, n->Store)) {
+            slang_info_log_error(emitInfo->log,
+                                 "Ran out of registers, too many variables");
+            return NULL;
+         }
          /*
          printf("IR_VAR_DECL %s %d store %p\n",
                 (char*) n->Var->a_name, n->Store->Index, (void*) n->Store);
@@ -1530,7 +1535,8 @@ emit(slang_emit_info *emitInfo, slang_ir_node *n)
                                                    n->Store->Size,
                                                    &n->Store->Swizzle);
       if (n->Store->Index < 0) {
-         RETURN_ERROR("Ran out of space for constants.", 0);
+         slang_info_log_error(emitInfo->log, "Ran out of space for constants");
+         return NULL;
       }
       return NULL;
 
diff --git a/src/mesa/shader/slang/slang_emit.h b/src/mesa/shader/slang/slang_emit.h
index 1b792402dac..13ba6d7d6c7 100644
--- a/src/mesa/shader/slang/slang_emit.h
+++ b/src/mesa/shader/slang/slang_emit.h
@@ -42,7 +42,8 @@ _slang_new_ir_storage(enum register_file file, GLint index, GLint size);
 
 extern GLboolean
 _slang_emit_code(slang_ir_node *n, slang_var_table *vartable,
-                 struct gl_program *prog, GLboolean withEnd);
+                 struct gl_program *prog, GLboolean withEnd,
+                 slang_info_log *log);
 
 
 #endif /* SLANG_EMIT_H */
diff --git a/src/mesa/shader/slang/slang_preprocess.h b/src/mesa/shader/slang/slang_preprocess.h
index f83e6e6e3fc..d8eb12e4ff2 100644
--- a/src/mesa/shader/slang/slang_preprocess.h
+++ b/src/mesa/shader/slang/slang_preprocess.h
@@ -1,8 +1,8 @@
 /*
  * Mesa 3-D graphics library
- * Version:  6.6
+ * Version:  6.5.3
  *
- * Copyright (C) 2005-2006  Brian Paul   All Rights Reserved.
+ * Copyright (C) 2005-2007  Brian Paul   All Rights Reserved.
  *
  * Permission is hereby granted, free of charge, to any person obtaining a
  * copy of this software and associated documentation files (the "Software"),
@@ -22,24 +22,19 @@
  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  */
 
-#if !defined SLANG_PREPROCESS_H
+#ifndef SLANG_PREPROCESS_H
 #define SLANG_PREPROCESS_H
 
 #include "slang_compile.h"
+#include "slang_log.h"
 
-#if defined __cplusplus
-extern "C" {
-#endif
 
-GLboolean
+extern GLboolean
 _slang_preprocess_version (const char *, GLuint *, GLuint *, slang_info_log *);
 
-GLboolean
-_slang_preprocess_directives (slang_string *output, const char *input, slang_info_log *);
+extern GLboolean
+_slang_preprocess_directives (slang_string *output, const char *input,
+                              slang_info_log *);
 
-#ifdef __cplusplus
-}
-#endif
-
-#endif
 
+#endif /* SLANG_PREPROCESS_H */
diff --git a/src/mesa/shader/slang/slang_simplify.c b/src/mesa/shader/slang/slang_simplify.c
index 07b4ae27600..87b117874fd 100644
--- a/src/mesa/shader/slang/slang_simplify.c
+++ b/src/mesa/shader/slang/slang_simplify.c
@@ -292,7 +292,7 @@ _slang_simplify(slang_operation *oper,
 GLboolean
 _slang_adapt_call(slang_operation *callOper, const slang_function *fun,
                   const slang_name_space * space,
-                  slang_atom_pool * atoms)
+                  slang_atom_pool * atoms, slang_info_log *log)
 {
    const GLboolean haveRetValue = _slang_function_has_return_value(fun);
    const int numParams = fun->param_count - haveRetValue;
@@ -317,7 +317,7 @@ _slang_adapt_call(slang_operation *callOper, const slang_function *fun,
             if (!slang_typeinfo_construct(&argType))
                return GL_FALSE;
             if (!_slang_typeof_operation_(&callOper->children[i], space,
-                                          &argType, atoms)) {
+                                          &argType, atoms, log)) {
                slang_typeinfo_destruct(&argType);
                return GL_FALSE;
             }
@@ -392,7 +392,7 @@ _slang_adapt_call(slang_operation *callOper, const slang_function *fun,
       if (!slang_typeinfo_construct(&argType))
          return GL_FALSE;
       if (!_slang_typeof_operation_(&callOper->children[i], space,
-                                    &argType, atoms)) {
+                                    &argType, atoms, log)) {
          slang_typeinfo_destruct(&argType);
          return GL_FALSE;
       }
diff --git a/src/mesa/shader/slang/slang_simplify.h b/src/mesa/shader/slang/slang_simplify.h
index d6979a800a1..b3840ee9df8 100644
--- a/src/mesa/shader/slang/slang_simplify.h
+++ b/src/mesa/shader/slang/slang_simplify.h
@@ -16,8 +16,7 @@ _slang_simplify(slang_operation *oper,
 extern GLboolean
 _slang_adapt_call(slang_operation *callOper, const slang_function *fun,
                   const slang_name_space * space,
-                  slang_atom_pool * atoms);
-
+                  slang_atom_pool * atoms, slang_info_log *log);
 
 
 #endif /* SLANG_SIMPLIFY_H */
diff --git a/src/mesa/shader/slang/slang_typeinfo.c b/src/mesa/shader/slang/slang_typeinfo.c
index bbcc1c740c1..fe3834994dd 100644
--- a/src/mesa/shader/slang/slang_typeinfo.c
+++ b/src/mesa/shader/slang/slang_typeinfo.c
@@ -31,7 +31,7 @@
 #include "imports.h"
 #include "slang_typeinfo.h"
 #include "slang_compile.h"
-#include "slang_error.h"
+#include "slang_log.h"
 #include "prog_instruction.h"
 
 
@@ -302,14 +302,15 @@ typeof_existing_function(const char *name, const slang_operation * params,
                          GLuint num_params,
                          const slang_name_space * space,
                          slang_type_specifier * spec,
-                         slang_atom_pool * atoms)
+                         slang_atom_pool * atoms,
+                         slang_info_log *log)
 {
    slang_atom atom;
    GLboolean exists;
 
    atom = slang_atom_pool_atom(atoms, name);
    if (!_slang_typeof_function(atom, params, num_params, space, spec,
-                               &exists, atoms))
+                               &exists, atoms, log))
       return GL_FALSE;
    return exists;
 }
@@ -319,7 +320,7 @@ _slang_typeof_operation(const slang_assemble_ctx * A,
                         const slang_operation * op,
                         slang_typeinfo * ti)
 {
-   return _slang_typeof_operation_(op, &A->space, ti, A->atoms);
+   return _slang_typeof_operation_(op, &A->space, ti, A->atoms, A->log);
 }
 
 
@@ -335,7 +336,8 @@ GLboolean
 _slang_typeof_operation_(const slang_operation * op,
                          const slang_name_space * space,
                          slang_typeinfo * ti,
-                         slang_atom_pool * atoms)
+                         slang_atom_pool * atoms,
+                         slang_info_log *log)
 {
    ti->can_be_referenced = GL_FALSE;
    ti->is_swizzled = GL_FALSE;
@@ -364,7 +366,7 @@ _slang_typeof_operation_(const slang_operation * op,
    case SLANG_OPER_DIVASSIGN:
    case SLANG_OPER_PREINCREMENT:
    case SLANG_OPER_PREDECREMENT:
-      if (!_slang_typeof_operation_(op->children, space, ti, atoms))
+      if (!_slang_typeof_operation_(op->children, space, ti, atoms, log))
          return GL_FALSE;
       break;
    case SLANG_OPER_LITERAL_BOOL:
@@ -431,18 +433,24 @@ _slang_typeof_operation_(const slang_operation * op,
       {
          slang_variable *var;
          var = _slang_locate_variable(op->locals, op->a_id, GL_TRUE);
-         if (var == NULL)
-            RETURN_ERROR2("undefined variable", (char *) op->a_id, 0);
-         if (!slang_type_specifier_copy(&ti->spec, &var->type.specifier))
-            RETURN_OUT_OF_MEMORY();
+         if (!var) {
+            slang_info_log_error(log, "undefined variable '%s'",
+                                 (char *) op->a_id);
+            return GL_FALSE;
+         }
+         if (!slang_type_specifier_copy(&ti->spec, &var->type.specifier)) {
+            slang_info_log_memory(log);
+            return GL_FALSE;
+         }
          ti->can_be_referenced = GL_TRUE;
          ti->array_len = var->array_len;
       }
       break;
    case SLANG_OPER_SEQUENCE:
       /* TODO: check [0] and [1] if they match */
-      if (!_slang_typeof_operation_(&op->children[1], space, ti, atoms))
-         RETURN_NIL();
+      if (!_slang_typeof_operation_(&op->children[1], space, ti, atoms, log)) {
+         return GL_FALSE;
+      }
       ti->can_be_referenced = GL_FALSE;
       ti->is_swizzled = GL_FALSE;
       break;
@@ -454,8 +462,9 @@ _slang_typeof_operation_(const slang_operation * op,
       /*case SLANG_OPER_ANDASSIGN: */
    case SLANG_OPER_SELECT:
       /* TODO: check [1] and [2] if they match */
-      if (!_slang_typeof_operation_(&op->children[1], space, ti, atoms))
-         RETURN_NIL();
+      if (!_slang_typeof_operation_(&op->children[1], space, ti, atoms, log)) {
+         return GL_FALSE;
+      }
       ti->can_be_referenced = GL_FALSE;
       ti->is_swizzled = GL_FALSE;
       break;
@@ -466,35 +475,35 @@ _slang_typeof_operation_(const slang_operation * op,
       /*case SLANG_OPER_RSHIFT: */
    case SLANG_OPER_ADD:
       if (!typeof_existing_function("+", op->children, 2, space,
-                                    &ti->spec, atoms))
-         RETURN_NIL();
+                                    &ti->spec, atoms, log))
+         return GL_FALSE;
       break;
    case SLANG_OPER_SUBTRACT:
       if (!typeof_existing_function("-", op->children, 2, space,
-                                    &ti->spec, atoms))
-         RETURN_NIL();
+                                    &ti->spec, atoms, log))
+         return GL_FALSE;
       break;
    case SLANG_OPER_MULTIPLY:
       if (!typeof_existing_function("*", op->children, 2, space,
-                                    &ti->spec, atoms))
-         RETURN_NIL();
+                                    &ti->spec, atoms, log))
+         return GL_FALSE;
       break;
    case SLANG_OPER_DIVIDE:
       if (!typeof_existing_function("/", op->children, 2, space,
-                                    &ti->spec, atoms))
-         RETURN_NIL();
+                                    &ti->spec, atoms, log))
+         return GL_FALSE;
       break;
       /*case SLANG_OPER_MODULUS: */
    case SLANG_OPER_PLUS:
-      if (!_slang_typeof_operation_(op->children, space, ti, atoms))
-         RETURN_NIL();
+      if (!_slang_typeof_operation_(op->children, space, ti, atoms, log))
+         return GL_FALSE;
       ti->can_be_referenced = GL_FALSE;
       ti->is_swizzled = GL_FALSE;
       break;
    case SLANG_OPER_MINUS:
       if (!typeof_existing_function("-", op->children, 1, space,
-                                    &ti->spec, atoms))
-         RETURN_NIL();
+                                    &ti->spec, atoms, log))
+         return GL_FALSE;
       break;
       /*case SLANG_OPER_COMPLEMENT: */
    case SLANG_OPER_SUBSCRIPT:
@@ -502,23 +511,24 @@ _slang_typeof_operation_(const slang_operation * op,
          slang_typeinfo _ti;
 
          if (!slang_typeinfo_construct(&_ti))
-            RETURN_NIL();
-         if (!_slang_typeof_operation_(op->children, space, &_ti, atoms)) {
+            return GL_FALSE;
+         if (!_slang_typeof_operation_(op->children, space, &_ti, atoms, log)) {
             slang_typeinfo_destruct(&_ti);
-            RETURN_NIL();
+            return GL_FALSE;
          }
          ti->can_be_referenced = _ti.can_be_referenced;
          if (_ti.spec.type == SLANG_SPEC_ARRAY) {
             if (!slang_type_specifier_copy(&ti->spec, _ti.spec._array)) {
                slang_typeinfo_destruct(&_ti);
-               RETURN_NIL();
+               return GL_FALSE;
             }
          }
          else {
             if (!_slang_type_is_vector(_ti.spec.type)
                 && !_slang_type_is_matrix(_ti.spec.type)) {
                slang_typeinfo_destruct(&_ti);
-               RETURN_ERROR("cannot index a non-array type", 0);
+               slang_info_log_error(log, "cannot index a non-array type");
+               return GL_FALSE;
             }
             ti->spec.type = _slang_type_base(_ti.spec.type);
          }
@@ -530,8 +540,8 @@ _slang_typeof_operation_(const slang_operation * op,
          GLboolean exists;
 
          if (!_slang_typeof_function(op->a_id, op->children, op->num_children,
-                                     space, &ti->spec, &exists, atoms))
-            RETURN_NIL();
+                                     space, &ti->spec, &exists, atoms, log))
+            return GL_FALSE;
          if (!exists) {
             slang_struct *s =
                slang_struct_scope_find(space->structs, op->a_id, GL_TRUE);
@@ -540,14 +550,14 @@ _slang_typeof_operation_(const slang_operation * op,
                ti->spec._struct =
                   (slang_struct *) slang_alloc_malloc(sizeof(slang_struct));
                if (ti->spec._struct == NULL)
-                  RETURN_NIL();
+                  return GL_FALSE;
                if (!slang_struct_construct(ti->spec._struct)) {
                   slang_alloc_free(ti->spec._struct);
                   ti->spec._struct = NULL;
-                  RETURN_NIL();
+                  return GL_FALSE;
                }
                if (!slang_struct_copy(ti->spec._struct, s))
-                  RETURN_NIL();
+                  return GL_FALSE;
             }
             else {
                const char *name;
@@ -555,8 +565,10 @@ _slang_typeof_operation_(const slang_operation * op,
 
                name = slang_atom_pool_id(atoms, op->a_id);
                type = slang_type_specifier_type_from_string(name);
-               if (type == SLANG_SPEC_VOID)
-                  RETURN_ERROR2("function not found", name, 0);
+               if (type == SLANG_SPEC_VOID) {
+                  slang_info_log_error(log, "undefined function '%s'", name);
+                  return GL_FALSE;
+               }
                ti->spec.type = type;
             }
          }
@@ -567,10 +579,10 @@ _slang_typeof_operation_(const slang_operation * op,
          slang_typeinfo _ti;
 
          if (!slang_typeinfo_construct(&_ti))
-            RETURN_NIL();
-         if (!_slang_typeof_operation_(op->children, space, &_ti, atoms)) {
+            return GL_FALSE;
+         if (!_slang_typeof_operation_(op->children, space, &_ti, atoms, log)) {
             slang_typeinfo_destruct(&_ti);
-            RETURN_NIL();
+            return GL_FALSE;
          }
          if (_ti.spec.type == SLANG_SPEC_STRUCT) {
             slang_variable *field;
@@ -579,11 +591,11 @@ _slang_typeof_operation_(const slang_operation * op,
                                            GL_FALSE);
             if (field == NULL) {
                slang_typeinfo_destruct(&_ti);
-               RETURN_NIL();
+               return GL_FALSE;
             }
             if (!slang_type_specifier_copy(&ti->spec, &field->type.specifier)) {
                slang_typeinfo_destruct(&_ti);
-               RETURN_NIL();
+               return GL_FALSE;
             }
             ti->can_be_referenced = _ti.can_be_referenced;
          }
@@ -593,17 +605,19 @@ _slang_typeof_operation_(const slang_operation * op,
             slang_type_specifier_type base;
 
             /* determine the swizzle of the field expression */
-#if 000
+#if 000 /*XXX re-enable? */
             if (!_slang_type_is_vector(_ti.spec.type)) {
                slang_typeinfo_destruct(&_ti);
-               RETURN_ERROR("Can't swizzle scalar expression", 0);
+               slang_info_log_error(log, "Can't swizzle scalar expression");
+               return GL_FALSE;
             }
 #endif
             rows = _slang_type_dim(_ti.spec.type);
             swizzle = slang_atom_pool_id(atoms, op->a_id);
             if (!_slang_is_swizzle(swizzle, rows, &ti->swz)) {
                slang_typeinfo_destruct(&_ti);
-               RETURN_ERROR("Bad swizzle", 0);
+               slang_info_log_error(log, "bad swizzle '%s'", swizzle);
+               return GL_FALSE;
             }
             ti->is_swizzled = GL_TRUE;
             ti->can_be_referenced = _ti.can_be_referenced
@@ -674,13 +688,13 @@ _slang_typeof_operation_(const slang_operation * op,
       break;
    case SLANG_OPER_POSTINCREMENT:
    case SLANG_OPER_POSTDECREMENT:
-      if (!_slang_typeof_operation_(op->children, space, ti, atoms))
-         RETURN_NIL();
+      if (!_slang_typeof_operation_(op->children, space, ti, atoms, log))
+         return GL_FALSE;
       ti->can_be_referenced = GL_FALSE;
       ti->is_swizzled = GL_FALSE;
       break;
    default:
-      RETURN_NIL();
+      return GL_FALSE;
    }
 
    return GL_TRUE;
@@ -693,7 +707,8 @@ _slang_typeof_operation_(const slang_operation * op,
 slang_function *
 _slang_locate_function(const slang_function_scope * funcs, slang_atom a_name,
                        const slang_operation * args, GLuint num_args,
-                       const slang_name_space * space, slang_atom_pool * atoms)
+                       const slang_name_space * space, slang_atom_pool * atoms,
+                       slang_info_log *log)
 {
    GLuint i;
 
@@ -713,7 +728,7 @@ _slang_locate_function(const slang_function_scope * funcs, slang_atom a_name,
 
          if (!slang_typeinfo_construct(&ti))
             return NULL;
-         if (!_slang_typeof_operation_(&args[j], space, &ti, atoms)) {
+         if (!_slang_typeof_operation_(&args[j], space, &ti, atoms, log)) {
             slang_typeinfo_destruct(&ti);
             return NULL;
          }
@@ -737,7 +752,7 @@ _slang_locate_function(const slang_function_scope * funcs, slang_atom a_name,
    }
    if (funcs->outer_scope != NULL)
       return _slang_locate_function(funcs->outer_scope, a_name, args,
-                                    num_args, space, atoms);
+                                    num_args, space, atoms, log);
    return NULL;
 }
 
@@ -757,10 +772,10 @@ _slang_typeof_function(slang_atom a_name, const slang_operation * params,
                        GLuint num_params,
                        const slang_name_space * space,
                        slang_type_specifier * spec, GLboolean * exists,
-                       slang_atom_pool * atoms)
+                       slang_atom_pool *atoms, slang_info_log *log)
 {
    slang_function *fun = _slang_locate_function(space->funcs, a_name, params,
-                                                num_params, space, atoms);
+                                                num_params, space, atoms, log);
    *exists = fun != NULL;
    if (!fun)
       return GL_TRUE;  /* yes, not false */
diff --git a/src/mesa/shader/slang/slang_typeinfo.h b/src/mesa/shader/slang/slang_typeinfo.h
index 3115b71e085..62cf0009d3c 100644
--- a/src/mesa/shader/slang/slang_typeinfo.h
+++ b/src/mesa/shader/slang/slang_typeinfo.h
@@ -27,6 +27,7 @@
 
 #include "imports.h"
 #include "mtypes.h"
+#include "slang_log.h"
 #include "slang_utility.h"
 #include "slang_vartable.h"
 
@@ -60,6 +61,7 @@ typedef struct slang_assemble_ctx_
    slang_name_space space;
    struct gl_program *program;
    slang_var_table *vartable;
+   slang_info_log *log;
    struct slang_function_ *CurFunction;
    struct slang_ir_node_ *CurLoop;
 } slang_assemble_ctx;
@@ -70,7 +72,7 @@ _slang_locate_function(const struct slang_function_scope_ *funcs,
                        slang_atom name, const struct slang_operation_ *params,
                        GLuint num_params,
                        const slang_name_space *space,
-                       slang_atom_pool *);
+                       slang_atom_pool *atoms, slang_info_log *log);
 
 
 extern GLboolean
@@ -170,7 +172,8 @@ _slang_typeof_operation(const slang_assemble_ctx *,
 extern GLboolean
 _slang_typeof_operation_(const struct slang_operation_ *,
                          const slang_name_space *,
-                         slang_typeinfo *, slang_atom_pool *);
+                         slang_typeinfo *, slang_atom_pool *,
+                         slang_info_log *log);
 
 /**
  * Retrieves type of a function prototype, if one exists.
@@ -182,7 +185,7 @@ _slang_typeof_function(slang_atom a_name,
                        const struct slang_operation_ *params,
                        GLuint num_params, const slang_name_space *,
                        slang_type_specifier *spec, GLboolean *exists,
-                       slang_atom_pool *);
+                       slang_atom_pool *, slang_info_log *log);
 
 extern GLboolean
 _slang_type_is_matrix(slang_type_specifier_type);
diff --git a/src/mesa/sources b/src/mesa/sources
index a7bbc020125..628599c3c59 100644
--- a/src/mesa/sources
+++ b/src/mesa/sources
@@ -179,10 +179,10 @@ SLANG_SOURCES =	\
 	shader/slang/slang_compile_struct.c	\
 	shader/slang/slang_compile_variable.c	\
 	shader/slang/slang_emit.c	\
-	shader/slang/slang_error.c	\
 	shader/slang/slang_label.c	\
 	shader/slang/slang_library_noise.c	\
 	shader/slang/slang_link.c	\
+	shader/slang/slang_log.c	\
 	shader/slang/slang_preprocess.c	\
 	shader/slang/slang_print.c	\
 	shader/slang/slang_simplify.c	\