/* * Copyright © 2010 Intel Corporation * * Permission is hereby granted, free of charge, to any person obtaining a * copy of this software and associated documentation files (the "Software"), * to deal in the Software without restriction, including without limitation * the rights to use, copy, modify, merge, publish, distribute, sublicense, * and/or sell copies of the Software, and to permit persons to whom the * Software is furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice (including the next * paragraph) shall be included in all copies or substantial portions of the * Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER * DEALINGS IN THE SOFTWARE. */ #include extern "C" { #include } #include "ir_reader.h" #include "glsl_parser_extras.h" #include "glsl_types.h" #include "s_expression.h" static void ir_read_error(_mesa_glsl_parse_state *, s_expression *, const char *fmt, ...); static const glsl_type *read_type(_mesa_glsl_parse_state *, s_expression *); static void scan_for_prototypes(_mesa_glsl_parse_state *, exec_list *, s_expression *); static ir_function *read_function(_mesa_glsl_parse_state *, s_list *, bool skip_body); static void read_function_sig(_mesa_glsl_parse_state *, ir_function *, s_list *, bool skip_body); static void read_instructions(_mesa_glsl_parse_state *, exec_list *, s_expression *, ir_loop *); static ir_instruction *read_instruction(_mesa_glsl_parse_state *, s_expression *, ir_loop *); static ir_variable *read_declaration(_mesa_glsl_parse_state *, s_list *); static ir_if *read_if(_mesa_glsl_parse_state *, s_list *, ir_loop *); static ir_loop *read_loop(_mesa_glsl_parse_state *st, s_list *list); static ir_return *read_return(_mesa_glsl_parse_state *, s_list *); static ir_rvalue *read_rvalue(_mesa_glsl_parse_state *, s_expression *); static ir_assignment *read_assignment(_mesa_glsl_parse_state *, s_list *); static ir_expression *read_expression(_mesa_glsl_parse_state *, s_list *); static ir_call *read_call(_mesa_glsl_parse_state *, s_list *); static ir_swizzle *read_swizzle(_mesa_glsl_parse_state *, s_list *); static ir_constant *read_constant(_mesa_glsl_parse_state *, s_list *); static ir_texture *read_texture(_mesa_glsl_parse_state *, s_list *); static ir_dereference *read_dereference(_mesa_glsl_parse_state *, s_expression *); static ir_dereference *read_var_ref(_mesa_glsl_parse_state *, s_list *); static ir_dereference *read_array_ref(_mesa_glsl_parse_state *, s_list *); static ir_dereference *read_record_ref(_mesa_glsl_parse_state *, s_list *); void _mesa_glsl_read_ir(_mesa_glsl_parse_state *state, exec_list *instructions, const char *src, bool scan_for_protos) { s_expression *expr = s_expression::read_expression(state, src); if (expr == NULL) { ir_read_error(state, NULL, "couldn't parse S-Expression."); return; } if (scan_for_protos) { scan_for_prototypes(state, instructions, expr); if (state->error) return; } read_instructions(state, instructions, expr, NULL); talloc_free(expr); } static void ir_read_error(_mesa_glsl_parse_state *state, s_expression *expr, const char *fmt, ...) { va_list ap; state->error = true; if (state->current_function != NULL) state->info_log = talloc_asprintf_append(state->info_log, "In function %s:\n", state->current_function->function_name()); state->info_log = talloc_strdup_append(state->info_log, "error: "); va_start(ap, fmt); state->info_log = talloc_vasprintf_append(state->info_log, fmt, ap); va_end(ap); state->info_log = talloc_strdup_append(state->info_log, "\n"); if (expr != NULL) { state->info_log = talloc_strdup_append(state->info_log, "...in this context:\n "); expr->print(); state->info_log = talloc_strdup_append(state->info_log, "\n\n"); } } static const glsl_type * read_type(_mesa_glsl_parse_state *st, s_expression *expr) { s_list *list = SX_AS_LIST(expr); if (list != NULL) { s_symbol *type_sym = SX_AS_SYMBOL(list->subexpressions.get_head()); if (type_sym == NULL) { ir_read_error(st, expr, "expected type (array ...) or (struct ...)"); return NULL; } if (strcmp(type_sym->value(), "array") == 0) { if (list->length() != 3) { ir_read_error(st, expr, "expected type (array )"); return NULL; } // Read base type s_expression *base_expr = (s_expression*) type_sym->next; const glsl_type *base_type = read_type(st, base_expr); if (base_type == NULL) { ir_read_error(st, NULL, "when reading base type of array"); return NULL; } // Read array size s_int *size = SX_AS_INT(base_expr->next); if (size == NULL) { ir_read_error(st, expr, "found non-integer array size"); return NULL; } return glsl_type::get_array_instance(base_type, size->value()); } else if (strcmp(type_sym->value(), "struct") == 0) { assert(false); // FINISHME } else { ir_read_error(st, expr, "expected (array ...) or (struct ...); " "found (%s ...)", type_sym->value()); return NULL; } } s_symbol *type_sym = SX_AS_SYMBOL(expr); if (type_sym == NULL) { ir_read_error(st, expr, "expected (symbol or list)"); return NULL; } const glsl_type *type = st->symbols->get_type(type_sym->value()); if (type == NULL) ir_read_error(st, expr, "invalid type: %s", type_sym->value()); return type; } static void scan_for_prototypes(_mesa_glsl_parse_state *st, exec_list *instructions, s_expression *expr) { s_list *list = SX_AS_LIST(expr); if (list == NULL) { ir_read_error(st, expr, "Expected ( ...); found an atom."); return; } foreach_iter(exec_list_iterator, it, list->subexpressions) { s_list *sub = SX_AS_LIST(it.get()); if (sub == NULL) continue; // not a (function ...); ignore it. s_symbol *tag = SX_AS_SYMBOL(sub->subexpressions.get_head()); if (tag == NULL || strcmp(tag->value(), "function") != 0) continue; // not a (function ...); ignore it. ir_function *f = read_function(st, sub, true); if (f == NULL) return; instructions->push_tail(f); } } static ir_function * read_function(_mesa_glsl_parse_state *st, s_list *list, bool skip_body) { void *ctx = st; bool added = false; if (list->length() < 3) { ir_read_error(st, list, "Expected (function (signature ...) ...)"); return NULL; } s_symbol *name = SX_AS_SYMBOL(list->subexpressions.head->next); if (name == NULL) { ir_read_error(st, list, "Expected (function ...)"); return NULL; } ir_function *f = st->symbols->get_function(name->value()); if (f == NULL) { f = new(ctx) ir_function(name->value()); f->is_builtin = true; added = st->symbols->add_function(f->name, f); assert(added); } exec_list_iterator it = list->subexpressions.iterator(); it.next(); // skip "function" tag it.next(); // skip function name for (/* nothing */; it.has_next(); it.next()) { s_list *siglist = SX_AS_LIST(it.get()); if (siglist == NULL) { ir_read_error(st, list, "Expected (function (signature ...) ...)"); return NULL; } s_symbol *tag = SX_AS_SYMBOL(siglist->subexpressions.get_head()); if (tag == NULL || strcmp(tag->value(), "signature") != 0) { ir_read_error(st, siglist, "Expected (signature ...)"); return NULL; } read_function_sig(st, f, siglist, skip_body); } return added ? f : NULL; } static void read_function_sig(_mesa_glsl_parse_state *st, ir_function *f, s_list *list, bool skip_body) { void *ctx = st; if (list->length() != 4) { ir_read_error(st, list, "Expected (signature (parameters ...) " "( ...))"); return; } s_expression *type_expr = (s_expression*) list->subexpressions.head->next; const glsl_type *return_type = read_type(st, type_expr); if (return_type == NULL) return; s_list *paramlist = SX_AS_LIST(type_expr->next); s_list *body_list = SX_AS_LIST(paramlist->next); if (paramlist == NULL || body_list == NULL) { ir_read_error(st, list, "Expected (signature (parameters ...) " "( ...))"); return; } s_symbol *paramtag = SX_AS_SYMBOL(paramlist->subexpressions.get_head()); if (paramtag == NULL || strcmp(paramtag->value(), "parameters") != 0) { ir_read_error(st, paramlist, "Expected (parameters ...)"); return; } // Read the parameters list into a temporary place. exec_list hir_parameters; st->symbols->push_scope(); exec_list_iterator it = paramlist->subexpressions.iterator(); for (it.next() /* skip "parameters" */; it.has_next(); it.next()) { s_list *decl = SX_AS_LIST(it.get()); ir_variable *var = read_declaration(st, decl); if (var == NULL) return; hir_parameters.push_tail(var); } ir_function_signature *sig = f->exact_matching_signature(&hir_parameters); if (sig == NULL && skip_body) { /* If scanning for prototypes, generate a new signature. */ sig = new(ctx) ir_function_signature(return_type); f->add_signature(sig); } else if (sig != NULL) { const char *badvar = sig->qualifiers_match(&hir_parameters); if (badvar != NULL) { ir_read_error(st, list, "function `%s' parameter `%s' qualifiers " "don't match prototype", f->name, badvar); return; } if (sig->return_type != return_type) { ir_read_error(st, list, "function `%s' return type doesn't " "match prototype", f->name); return; } } else { /* No prototype for this body exists - skip it. */ st->symbols->pop_scope(); return; } assert(sig != NULL); sig->replace_parameters(&hir_parameters); if (!skip_body && !body_list->subexpressions.is_empty()) { if (sig->is_defined) { ir_read_error(st, list, "function %s redefined", f->name); return; } st->current_function = sig; read_instructions(st, &sig->body, body_list, NULL); st->current_function = NULL; sig->is_defined = true; } st->symbols->pop_scope(); } static void read_instructions(_mesa_glsl_parse_state *st, exec_list *instructions, s_expression *expr, ir_loop *loop_ctx) { // Read in a list of instructions s_list *list = SX_AS_LIST(expr); if (list == NULL) { ir_read_error(st, expr, "Expected ( ...); found an atom."); return; } foreach_iter(exec_list_iterator, it, list->subexpressions) { s_expression *sub = (s_expression*) it.get(); ir_instruction *ir = read_instruction(st, sub, loop_ctx); if (ir != NULL) instructions->push_tail(ir); } } static ir_instruction * read_instruction(_mesa_glsl_parse_state *st, s_expression *expr, ir_loop *loop_ctx) { void *ctx = st; s_symbol *symbol = SX_AS_SYMBOL(expr); if (symbol != NULL) { if (strcmp(symbol->value(), "break") == 0 && loop_ctx != NULL) return new(ctx) ir_loop_jump(ir_loop_jump::jump_break); if (strcmp(symbol->value(), "continue") == 0 && loop_ctx != NULL) return new(ctx) ir_loop_jump(ir_loop_jump::jump_continue); } s_list *list = SX_AS_LIST(expr); if (list == NULL || list->subexpressions.is_empty()) { ir_read_error(st, expr, "Invalid instruction.\n"); return NULL; } s_symbol *tag = SX_AS_SYMBOL(list->subexpressions.get_head()); if (tag == NULL) { ir_read_error(st, expr, "expected instruction tag"); return NULL; } ir_instruction *inst = NULL; if (strcmp(tag->value(), "declare") == 0) { inst = read_declaration(st, list); } else if (strcmp(tag->value(), "assign") == 0) { inst = read_assignment(st, list); } else if (strcmp(tag->value(), "if") == 0) { inst = read_if(st, list, loop_ctx); } else if (strcmp(tag->value(), "loop") == 0) { inst = read_loop(st, list); } else if (strcmp(tag->value(), "return") == 0) { inst = read_return(st, list); } else if (strcmp(tag->value(), "function") == 0) { inst = read_function(st, list, false); } else { inst = read_rvalue(st, list); if (inst == NULL) ir_read_error(st, NULL, "when reading instruction"); } return inst; } static ir_variable * read_declaration(_mesa_glsl_parse_state *st, s_list *list) { void *ctx = st; if (list->length() != 4) { ir_read_error(st, list, "expected (declare () " ")"); return NULL; } s_list *quals = SX_AS_LIST(list->subexpressions.head->next); if (quals == NULL) { ir_read_error(st, list, "expected a list of variable qualifiers"); return NULL; } s_expression *type_expr = (s_expression*) quals->next; const glsl_type *type = read_type(st, type_expr); if (type == NULL) return NULL; s_symbol *var_name = SX_AS_SYMBOL(type_expr->next); if (var_name == NULL) { ir_read_error(st, list, "expected variable name, found non-symbol"); return NULL; } ir_variable *var = new(ctx) ir_variable(type, var_name->value(), ir_var_auto); foreach_iter(exec_list_iterator, it, quals->subexpressions) { s_symbol *qualifier = SX_AS_SYMBOL(it.get()); if (qualifier == NULL) { ir_read_error(st, list, "qualifier list must contain only symbols"); delete var; return NULL; } // FINISHME: Check for duplicate/conflicting qualifiers. if (strcmp(qualifier->value(), "centroid") == 0) { var->centroid = 1; } else if (strcmp(qualifier->value(), "invariant") == 0) { var->invariant = 1; } else if (strcmp(qualifier->value(), "uniform") == 0) { var->mode = ir_var_uniform; } else if (strcmp(qualifier->value(), "auto") == 0) { var->mode = ir_var_auto; } else if (strcmp(qualifier->value(), "in") == 0) { var->mode = ir_var_in; } else if (strcmp(qualifier->value(), "out") == 0) { var->mode = ir_var_out; } else if (strcmp(qualifier->value(), "inout") == 0) { var->mode = ir_var_inout; } else if (strcmp(qualifier->value(), "smooth") == 0) { var->interpolation = ir_var_smooth; } else if (strcmp(qualifier->value(), "flat") == 0) { var->interpolation = ir_var_flat; } else if (strcmp(qualifier->value(), "noperspective") == 0) { var->interpolation = ir_var_noperspective; } else { ir_read_error(st, list, "unknown qualifier: %s", qualifier->value()); delete var; return NULL; } } // Add the variable to the symbol table st->symbols->add_variable(var->name, var); return var; } static ir_if * read_if(_mesa_glsl_parse_state *st, s_list *list, ir_loop *loop_ctx) { void *ctx = st; if (list->length() != 4) { ir_read_error(st, list, "expected (if ( ...) " "( ...))"); return NULL; } s_expression *cond_expr = (s_expression*) list->subexpressions.head->next; ir_rvalue *condition = read_rvalue(st, cond_expr); if (condition == NULL) { ir_read_error(st, NULL, "when reading condition of (if ...)"); return NULL; } s_expression *then_expr = (s_expression*) cond_expr->next; s_expression *else_expr = (s_expression*) then_expr->next; ir_if *iff = new(ctx) ir_if(condition); read_instructions(st, &iff->then_instructions, then_expr, loop_ctx); read_instructions(st, &iff->else_instructions, else_expr, loop_ctx); if (st->error) { delete iff; iff = NULL; } return iff; } static ir_loop * read_loop(_mesa_glsl_parse_state *st, s_list *list) { void *ctx = st; if (list->length() != 6) { ir_read_error(st, list, "expected (loop " " )"); return NULL; } s_expression *count_expr = (s_expression*) list->subexpressions.head->next; s_expression *from_expr = (s_expression*) count_expr->next; s_expression *to_expr = (s_expression*) from_expr->next; s_expression *inc_expr = (s_expression*) to_expr->next; s_expression *body_expr = (s_expression*) inc_expr->next; // FINISHME: actually read the count/from/to fields. ir_loop *loop = new(ctx) ir_loop; read_instructions(st, &loop->body_instructions, body_expr, loop); if (st->error) { delete loop; loop = NULL; } return loop; } static ir_return * read_return(_mesa_glsl_parse_state *st, s_list *list) { void *ctx = st; if (list->length() != 2) { ir_read_error(st, list, "expected (return )"); return NULL; } s_expression *expr = (s_expression*) list->subexpressions.head->next; ir_rvalue *retval = read_rvalue(st, expr); if (retval == NULL) { ir_read_error(st, NULL, "when reading return value"); return NULL; } return new(ctx) ir_return(retval); } static ir_rvalue * read_rvalue(_mesa_glsl_parse_state *st, s_expression *expr) { s_list *list = SX_AS_LIST(expr); if (list == NULL || list->subexpressions.is_empty()) return NULL; s_symbol *tag = SX_AS_SYMBOL(list->subexpressions.get_head()); if (tag == NULL) { ir_read_error(st, expr, "expected rvalue tag"); return NULL; } ir_rvalue *rvalue = read_dereference(st, list); if (rvalue != NULL || st->error) return rvalue; else if (strcmp(tag->value(), "swiz") == 0) { rvalue = read_swizzle(st, list); } else if (strcmp(tag->value(), "expression") == 0) { rvalue = read_expression(st, list); } else if (strcmp(tag->value(), "call") == 0) { rvalue = read_call(st, list); } else if (strcmp(tag->value(), "constant") == 0) { rvalue = read_constant(st, list); } else { rvalue = read_texture(st, list); if (rvalue == NULL && !st->error) ir_read_error(st, expr, "unrecognized rvalue tag: %s", tag->value()); } return rvalue; } static ir_assignment * read_assignment(_mesa_glsl_parse_state *st, s_list *list) { void *ctx = st; if (list->length() != 4) { ir_read_error(st, list, "expected (assign )"); return NULL; } s_expression *cond_expr = (s_expression*) list->subexpressions.head->next; s_expression *lhs_expr = (s_expression*) cond_expr->next; s_expression *rhs_expr = (s_expression*) lhs_expr->next; // FINISHME: Deal with "true" condition ir_rvalue *condition = read_rvalue(st, cond_expr); if (condition == NULL) { ir_read_error(st, NULL, "when reading condition of assignment"); return NULL; } ir_rvalue *lhs = read_rvalue(st, lhs_expr); if (lhs == NULL) { ir_read_error(st, NULL, "when reading left-hand side of assignment"); return NULL; } ir_rvalue *rhs = read_rvalue(st, rhs_expr); if (rhs == NULL) { ir_read_error(st, NULL, "when reading right-hand side of assignment"); return NULL; } return new(ctx) ir_assignment(lhs, rhs, condition); } static ir_call * read_call(_mesa_glsl_parse_state *st, s_list *list) { void *ctx = st; if (list->length() != 3) { ir_read_error(st, list, "expected (call ( ...))"); return NULL; } s_symbol *name = SX_AS_SYMBOL(list->subexpressions.head->next); s_list *params = SX_AS_LIST(name->next); if (name == NULL || params == NULL) { ir_read_error(st, list, "expected (call ( ...))"); return NULL; } exec_list parameters; foreach_iter(exec_list_iterator, it, params->subexpressions) { s_expression *expr = (s_expression*) it.get(); ir_rvalue *param = read_rvalue(st, expr); if (param == NULL) { ir_read_error(st, list, "when reading parameter to function call"); return NULL; } parameters.push_tail(param); } ir_function *f = st->symbols->get_function(name->value()); if (f == NULL) { ir_read_error(st, list, "found call to undefined function %s", name->value()); return NULL; } ir_function_signature *callee = f->matching_signature(¶meters); if (callee == NULL) { ir_read_error(st, list, "couldn't find matching signature for function " "%s", name->value()); return NULL; } return new(ctx) ir_call(callee, ¶meters); } static ir_expression * read_expression(_mesa_glsl_parse_state *st, s_list *list) { void *ctx = st; const unsigned list_length = list->length(); if (list_length < 4) { ir_read_error(st, list, "expected (expression " " [])"); return NULL; } s_expression *type_expr = (s_expression*) list->subexpressions.head->next; const glsl_type *type = read_type(st, type_expr); if (type == NULL) return NULL; /* Read the operator */ s_symbol *op_sym = SX_AS_SYMBOL(type_expr->next); if (op_sym == NULL) { ir_read_error(st, list, "expected operator, found non-symbol"); return NULL; } ir_expression_operation op = ir_expression::get_operator(op_sym->value()); if (op == (ir_expression_operation) -1) { ir_read_error(st, list, "invalid operator: %s", op_sym->value()); return NULL; } /* Now that we know the operator, check for the right number of operands */ if (ir_expression::get_num_operands(op) == 2) { if (list_length != 5) { ir_read_error(st, list, "expected (expression %s " " )", op_sym->value()); return NULL; } } else { if (list_length != 4) { ir_read_error(st, list, "expected (expression %s )", op_sym->value()); return NULL; } } s_expression *exp1 = (s_expression*) (op_sym->next); ir_rvalue *arg1 = read_rvalue(st, exp1); if (arg1 == NULL) { ir_read_error(st, NULL, "when reading first operand of %s", op_sym->value()); return NULL; } ir_rvalue *arg2 = NULL; if (ir_expression::get_num_operands(op) == 2) { s_expression *exp2 = (s_expression*) (exp1->next); arg2 = read_rvalue(st, exp2); if (arg2 == NULL) { ir_read_error(st, NULL, "when reading second operand of %s", op_sym->value()); return NULL; } } return new(ctx) ir_expression(op, type, arg1, arg2); } static ir_swizzle * read_swizzle(_mesa_glsl_parse_state *st, s_list *list) { if (list->length() != 3) { ir_read_error(st, list, "expected (swiz )"); return NULL; } s_symbol *swiz = SX_AS_SYMBOL(list->subexpressions.head->next); if (swiz == NULL) { ir_read_error(st, list, "expected a valid swizzle; found non-symbol"); return NULL; } if (strlen(swiz->value()) > 4) { ir_read_error(st, list, "expected a valid swizzle; found %s", swiz->value()); return NULL; } s_expression *sub = (s_expression*) swiz->next; if (sub == NULL) { ir_read_error(st, list, "expected rvalue: (swizzle %s )", swiz->value()); return NULL; } ir_rvalue *rvalue = read_rvalue(st, sub); if (rvalue == NULL) return NULL; ir_swizzle *ir = ir_swizzle::create(rvalue, swiz->value(), rvalue->type->vector_elements); if (ir == NULL) ir_read_error(st, list, "invalid swizzle"); return ir; } static ir_constant * read_constant(_mesa_glsl_parse_state *st, s_list *list) { void *ctx = st; if (list->length() != 3) { ir_read_error(st, list, "expected (constant (...))"); return NULL; } s_expression *type_expr = (s_expression*) list->subexpressions.head->next; const glsl_type *type = read_type(st, type_expr); if (type == NULL) return NULL; s_list *values = SX_AS_LIST(type_expr->next); if (values == NULL) { ir_read_error(st, list, "expected (constant (...))"); return NULL; } if (type->is_array()) { const unsigned elements_supplied = values->length(); if (elements_supplied != type->length) { ir_read_error(st, values, "expected exactly %u array elements, " "given %u", type->length, elements_supplied); return NULL; } exec_list elements; foreach_iter(exec_list_iterator, it, values->subexpressions) { s_expression *expr = (s_expression *) it.get(); s_list *elt = SX_AS_LIST(expr); if (elt == NULL) { ir_read_error(st, expr, "expected (constant ...) array element"); return NULL; } ir_constant *ir_elt = read_constant(st, elt); if (ir_elt == NULL) return NULL; elements.push_tail(ir_elt); } return new(ctx) ir_constant(type, &elements); } const glsl_type *const base_type = type->get_base_type(); ir_constant_data data = { { 0 } }; // Read in list of values (at most 16). int k = 0; foreach_iter(exec_list_iterator, it, values->subexpressions) { if (k >= 16) { ir_read_error(st, values, "expected at most 16 numbers"); return NULL; } s_expression *expr = (s_expression*) it.get(); if (base_type->base_type == GLSL_TYPE_FLOAT) { s_number *value = SX_AS_NUMBER(expr); if (value == NULL) { ir_read_error(st, values, "expected numbers"); return NULL; } data.f[k] = value->fvalue(); } else { s_int *value = SX_AS_INT(expr); if (value == NULL) { ir_read_error(st, values, "expected integers"); return NULL; } switch (base_type->base_type) { case GLSL_TYPE_UINT: { data.u[k] = value->value(); break; } case GLSL_TYPE_INT: { data.i[k] = value->value(); break; } case GLSL_TYPE_BOOL: { data.b[k] = value->value(); break; } default: ir_read_error(st, values, "unsupported constant type"); return NULL; } } ++k; } return new(ctx) ir_constant(type, &data); } static ir_dereference * read_dereference(_mesa_glsl_parse_state *st, s_expression *expr) { s_list *list = SX_AS_LIST(expr); if (list == NULL || list->subexpressions.is_empty()) return NULL; s_symbol *tag = SX_AS_SYMBOL(list->subexpressions.head); assert(tag != NULL); if (strcmp(tag->value(), "var_ref") == 0) return read_var_ref(st, list); if (strcmp(tag->value(), "array_ref") == 0) return read_array_ref(st, list); if (strcmp(tag->value(), "record_ref") == 0) return read_record_ref(st, list); return NULL; } static ir_dereference * read_var_ref(_mesa_glsl_parse_state *st, s_list *list) { void *ctx = st; if (list->length() != 2) { ir_read_error(st, list, "expected (var_ref )"); return NULL; } s_symbol *var_name = SX_AS_SYMBOL(list->subexpressions.head->next); if (var_name == NULL) { ir_read_error(st, list, "expected (var_ref )"); return NULL; } ir_variable *var = st->symbols->get_variable(var_name->value()); if (var == NULL) { ir_read_error(st, list, "undeclared variable: %s", var_name->value()); return NULL; } return new(ctx) ir_dereference_variable(var); } static ir_dereference * read_array_ref(_mesa_glsl_parse_state *st, s_list *list) { void *ctx = st; if (list->length() != 3) { ir_read_error(st, list, "expected (array_ref )"); return NULL; } s_expression *subj_expr = (s_expression*) list->subexpressions.head->next; ir_rvalue *subject = read_rvalue(st, subj_expr); if (subject == NULL) { ir_read_error(st, NULL, "when reading the subject of an array_ref"); return NULL; } s_expression *idx_expr = (s_expression*) subj_expr->next; ir_rvalue *idx = read_rvalue(st, idx_expr); return new(ctx) ir_dereference_array(subject, idx); } static ir_dereference * read_record_ref(_mesa_glsl_parse_state *st, s_list *list) { void *ctx = st; if (list->length() != 3) { ir_read_error(st, list, "expected (record_ref )"); return NULL; } s_expression *subj_expr = (s_expression*) list->subexpressions.head->next; ir_rvalue *subject = read_rvalue(st, subj_expr); if (subject == NULL) { ir_read_error(st, NULL, "when reading the subject of a record_ref"); return NULL; } s_symbol *field = SX_AS_SYMBOL(subj_expr->next); if (field == NULL) { ir_read_error(st, list, "expected (record_ref ... )"); return NULL; } return new(ctx) ir_dereference_record(subject, field->value()); } static bool valid_texture_list_length(ir_texture_opcode op, s_list *list) { unsigned required_length = 7; if (op == ir_txf) required_length = 5; else if (op == ir_tex) required_length = 6; return list->length() == required_length; } static ir_texture * read_texture(_mesa_glsl_parse_state *st, s_list *list) { void *ctx = st; s_symbol *tag = SX_AS_SYMBOL(list->subexpressions.head); assert(tag != NULL); ir_texture_opcode op = ir_texture::get_opcode(tag->value()); if (op == (ir_texture_opcode) -1) return NULL; if (!valid_texture_list_length(op, list)) { ir_read_error(st, NULL, "invalid list size in (%s ...)", tag->value()); return NULL; } ir_texture *tex = new(ctx) ir_texture(op); // Read sampler (must be a deref) s_expression *sampler_expr = (s_expression *) tag->next; ir_dereference *sampler = read_dereference(st, sampler_expr); if (sampler == NULL) { ir_read_error(st, NULL, "when reading sampler in (%s ...)", tag->value()); return NULL; } tex->set_sampler(sampler); // Read coordinate (any rvalue) s_expression *coordinate_expr = (s_expression *) sampler_expr->next; tex->coordinate = read_rvalue(st, coordinate_expr); if (tex->coordinate == NULL) { ir_read_error(st, NULL, "when reading coordinate in (%s ...)", tag->value()); return NULL; } // Read texel offset, i.e. (0 0 0) s_list *offset_list = SX_AS_LIST(coordinate_expr->next); if (offset_list == NULL || offset_list->length() != 3) { ir_read_error(st, offset_list, "expected ( )"); return NULL; } s_int *offset_x = SX_AS_INT(offset_list->subexpressions.head); s_int *offset_y = SX_AS_INT(offset_x->next); s_int *offset_z = SX_AS_INT(offset_y->next); if (offset_x == NULL || offset_y == NULL || offset_z == NULL) { ir_read_error(st, offset_list, "expected ( )"); return NULL; } tex->offsets[0] = offset_x->value(); tex->offsets[1] = offset_y->value(); tex->offsets[2] = offset_z->value(); if (op == ir_txf) { s_expression *lod_expr = (s_expression *) offset_list->next; tex->lod_info.lod = read_rvalue(st, lod_expr); if (tex->lod_info.lod == NULL) { ir_read_error(st, NULL, "when reading LOD in (txf ...)"); return NULL; } } else { s_expression *proj_expr = (s_expression *) offset_list->next; s_int *proj_as_int = SX_AS_INT(proj_expr); if (proj_as_int && proj_as_int->value() == 1) { tex->projector = NULL; } else { tex->projector = read_rvalue(st, proj_expr); if (tex->projector == NULL) { ir_read_error(st, NULL, "when reading projective divide in (%s ..)", tag->value()); return NULL; } } s_list *shadow_list = SX_AS_LIST(proj_expr->next); if (shadow_list == NULL) { ir_read_error(st, NULL, "shadow comparitor must be a list"); return NULL; } if (shadow_list->subexpressions.is_empty()) { tex->shadow_comparitor= NULL; } else { tex->shadow_comparitor = read_rvalue(st, shadow_list); if (tex->shadow_comparitor == NULL) { ir_read_error(st, NULL, "when reading shadow comparitor in (%s ..)", tag->value()); return NULL; } } s_expression *lod_expr = (s_expression *) shadow_list->next; switch (op) { case ir_txb: tex->lod_info.bias = read_rvalue(st, lod_expr); if (tex->lod_info.bias == NULL) { ir_read_error(st, NULL, "when reading LOD bias in (txb ...)"); return NULL; } break; case ir_txl: tex->lod_info.lod = read_rvalue(st, lod_expr); if (tex->lod_info.lod == NULL) { ir_read_error(st, NULL, "when reading LOD in (txl ...)"); return NULL; } break; case ir_txd: { s_list *lod_list = SX_AS_LIST(lod_expr); if (lod_list->length() != 2) { ir_read_error(st, lod_expr, "expected (dPdx dPdy) in (txd ...)"); return NULL; } s_expression *dx_expr = (s_expression *) lod_list->subexpressions.head; s_expression *dy_expr = (s_expression *) dx_expr->next; tex->lod_info.grad.dPdx = read_rvalue(st, dx_expr); if (tex->lod_info.grad.dPdx == NULL) { ir_read_error(st, NULL, "when reading dPdx in (txd ...)"); return NULL; } tex->lod_info.grad.dPdy = read_rvalue(st, dy_expr); if (tex->lod_info.grad.dPdy == NULL) { ir_read_error(st, NULL, "when reading dPdy in (txd ...)"); return NULL; } break; } default: // tex doesn't have any extra parameters and txf was handled earlier. break; }; } return tex; }