state->current_function = NULL;
+ state->toplevel_ir = instructions;
+
/* Section 4.2 of the GLSL 1.20 specification states:
* "The built-in functions are scoped in a scope outside the global scope
* users declare global variables in. That is, a shader's global scope,
ast->hir(instructions, state);
detect_recursion_unlinked(state, instructions);
+
+ state->toplevel_ir = NULL;
}
return NULL;
}
+static void
+mark_whole_array_access(ir_rvalue *access)
+{
+ ir_dereference_variable *deref = access->as_dereference_variable();
+
+ if (deref && deref->var) {
+ deref->var->max_array_access = deref->type->length - 1;
+ }
+}
+
ir_rvalue *
do_assignment(exec_list *instructions, struct _mesa_glsl_parse_state *state,
ir_rvalue *lhs, ir_rvalue *rhs, bool is_initializer,
lhs->variable_referenced()->name);
error_emitted = true;
+ } else if (state->language_version <= 110 && lhs->type->is_array()) {
+ /* From page 32 (page 38 of the PDF) of the GLSL 1.10 spec:
+ *
+ * "Other binary or unary expressions, non-dereferenced
+ * arrays, function names, swizzles with repeated fields,
+ * and constants cannot be l-values."
+ */
+ _mesa_glsl_error(&lhs_loc, state, "whole array assignment is not "
+ "allowed in GLSL 1.10 or GLSL ES 1.00.");
+ error_emitted = true;
} else if (!lhs->is_lvalue()) {
_mesa_glsl_error(& lhs_loc, state, "non-lvalue in assignment");
error_emitted = true;
}
-
- if (state->es_shader && lhs->type->is_array()) {
- _mesa_glsl_error(&lhs_loc, state, "whole array assignment is not "
- "allowed in GLSL ES 1.00.");
- error_emitted = true;
- }
}
ir_rvalue *new_rhs =
rhs->type->array_size());
d->type = var->type;
}
+ mark_whole_array_access(rhs);
+ mark_whole_array_access(lhs);
}
/* Most callers of do_assignment (assign, add_assign, pre_inc/dec,
return NULL;
}
-static void
-mark_whole_array_access(ir_rvalue *access)
-{
- ir_dereference_variable *deref = access->as_dereference_variable();
-
- if (deref) {
- deref->var->max_array_access = deref->type->length - 1;
- }
-}
-
static ir_rvalue *
do_comparison(void *mem_ctx, int operation, ir_rvalue *op0, ir_rvalue *op1)
{
return new(ctx) ir_constant(true);
}
+/**
+ * If name refers to a builtin array whose maximum allowed size is less than
+ * size, report an error and return true. Otherwise return false.
+ */
+static bool
+check_builtin_array_max_size(const char *name, unsigned size,
+ YYLTYPE loc, struct _mesa_glsl_parse_state *state)
+{
+ if ((strcmp("gl_TexCoord", name) == 0)
+ && (size > state->Const.MaxTextureCoords)) {
+ /* From page 54 (page 60 of the PDF) of the GLSL 1.20 spec:
+ *
+ * "The size [of gl_TexCoord] can be at most
+ * gl_MaxTextureCoords."
+ */
+ _mesa_glsl_error(&loc, state, "`gl_TexCoord' array size cannot "
+ "be larger than gl_MaxTextureCoords (%u)\n",
+ state->Const.MaxTextureCoords);
+ return true;
+ } else if (strcmp("gl_ClipDistance", name) == 0
+ && size > state->Const.MaxClipPlanes) {
+ /* From section 7.1 (Vertex Shader Special Variables) of the
+ * GLSL 1.30 spec:
+ *
+ * "The gl_ClipDistance array is predeclared as unsized and
+ * must be sized by the shader either redeclaring it with a
+ * size or indexing it only with integral constant
+ * expressions. ... The size can be at most
+ * gl_MaxClipDistances."
+ */
+ _mesa_glsl_error(&loc, state, "`gl_ClipDistance' array size cannot "
+ "be larger than gl_MaxClipDistances (%u)\n",
+ state->Const.MaxClipPlanes);
+ return true;
+ }
+ return false;
+}
+
ir_rvalue *
ast_expression::hir(exec_list *instructions,
struct _mesa_glsl_parse_state *state)
* FINISHME: array access limits be added to ir_dereference?
*/
ir_variable *const v = array->whole_variable_referenced();
- if ((v != NULL) && (unsigned(idx) > v->max_array_access))
+ if ((v != NULL) && (unsigned(idx) > v->max_array_access)) {
v->max_array_access = idx;
+
+ /* Check whether this access will, as a side effect, implicitly
+ * cause the size of a built-in array to be too large.
+ */
+ if (check_builtin_array_max_size(v->name, idx+1, loc, state))
+ error_emitted = true;
+ }
}
} else if (array->type->array_size() == 0) {
_mesa_glsl_error(&loc, state, "unsized array index must be constant");
ir_rvalue *const ir = array_size->hir(& dummy_instructions, state);
YYLTYPE loc = array_size->get_location();
- /* FINISHME: Verify that the grammar forbids side-effects in array
- * FINISHME: sizes. i.e., 'vec4 [x = 12] data'
- */
- assert(dummy_instructions.is_empty());
-
if (ir != NULL) {
if (!ir->type->is_integer()) {
_mesa_glsl_error(& loc, state, "array size must be integer type");
} else {
assert(size->type == ir->type);
length = size->value.u[0];
+
+ /* If the array size is const (and we've verified that
+ * it is) then no instructions should have been emitted
+ * when we converted it to HIR. If they were emitted,
+ * then either the array size isn't const after all, or
+ * we are emitting unnecessary instructions.
+ */
+ assert(dummy_instructions.is_empty());
}
}
}
var->depth_layout = ir_depth_layout_unchanged;
else
var->depth_layout = ir_depth_layout_none;
-
- if (var->type->is_array() && state->language_version != 110) {
- var->array_lvalue = true;
- }
}
/**
* FINISHME: required or not.
*/
- /* From page 54 (page 60 of the PDF) of the GLSL 1.20 spec:
- *
- * "The size [of gl_TexCoord] can be at most
- * gl_MaxTextureCoords."
- */
const unsigned size = unsigned(var->type->array_size());
- if ((strcmp("gl_TexCoord", var->name) == 0)
- && (size > state->Const.MaxTextureCoords)) {
- _mesa_glsl_error(& loc, state, "`gl_TexCoord' array size cannot "
- "be larger than gl_MaxTextureCoords (%u)\n",
- state->Const.MaxTextureCoords);
- } else if ((size > 0) && (size <= earlier->max_array_access)) {
+ check_builtin_array_max_size(var->name, size, loc, state);
+ if ((size > 0) && (size <= earlier->max_array_access)) {
_mesa_glsl_error(& loc, state, "array size must be > %u due to "
"previous access",
earlier->max_array_access);
decl_type = this->type->specifier->glsl_type(& type_name, state);
if (this->declarations.is_empty()) {
- /* The only valid case where the declaration list can be empty is when
- * the declaration is setting the default precision of a built-in type
- * (e.g., 'precision highp vec4;').
- */
-
if (decl_type != NULL) {
+ /* Warn if this empty declaration is not for declaring a structure.
+ */
+ if (this->type->specifier->structure == NULL) {
+ _mesa_glsl_warning(&loc, state, "empty declaration");
+ }
} else {
_mesa_glsl_error(& loc, state, "incomplete declaration");
}
type = glsl_type::error_type;
}
+ /* From page 39 (page 45 of the PDF) of the GLSL 1.10 spec:
+ *
+ * "When calling a function, expressions that do not evaluate to
+ * l-values cannot be passed to parameters declared as out or inout."
+ *
+ * From page 32 (page 38 of the PDF) of the GLSL 1.10 spec:
+ *
+ * "Other binary or unary expressions, non-dereferenced arrays,
+ * function names, swizzles with repeated fields, and constants
+ * cannot be l-values."
+ *
+ * So for GLSL 1.10, passing an array as an out or inout parameter is not
+ * allowed. This restriction is removed in GLSL 1.20, and in GLSL ES.
+ */
+ if ((var->mode == ir_var_inout || var->mode == ir_var_out)
+ && type->is_array() && state->language_version == 110) {
+ _mesa_glsl_error(&loc, state, "Arrays cannot be out or inout parameters in GLSL 1.10");
+ type = glsl_type::error_type;
+ }
+
instructions->push_tail(var);
/* Parameter declarations do not have r-values.
void
-emit_function(_mesa_glsl_parse_state *state, exec_list *instructions,
- ir_function *f)
+emit_function(_mesa_glsl_parse_state *state, ir_function *f)
{
- /* Emit the new function header */
- if (state->current_function == NULL) {
- instructions->push_tail(f);
- } else {
- /* IR invariants disallow function declarations or definitions nested
- * within other function definitions. Insert the new ir_function
- * block in the instruction sequence before the ir_function block
- * containing the current ir_function_signature.
- */
- ir_function *const curr =
- const_cast<ir_function *>(state->current_function->function());
-
- curr->insert_before(f);
- }
+ /* IR invariants disallow function declarations or definitions
+ * nested within other function definitions. But there is no
+ * requirement about the relative order of function declarations
+ * and definitions with respect to one another. So simply insert
+ * the new ir_function block at the end of the toplevel instruction
+ * list.
+ */
+ state->toplevel_ir->push_tail(f);
}
const char *const name = identifier;
+ /* New functions are always added to the top-level IR instruction stream,
+ * so this instruction list pointer is ignored. See also emit_function
+ * (called below).
+ */
+ (void) instructions;
+
/* From page 21 (page 27 of the PDF) of the GLSL 1.20 spec,
*
* "Function declarations (prototypes) cannot occur inside of functions;
return NULL;
}
- emit_function(state, instructions, f);
+ emit_function(state, f);
}
/* Verify the return type of main() */
projects / mesa.git / blobdiff