Partial IR reader.
Currently reads assignments, constants, expressions, and swizzles.
This commit is contained in:
Kenneth Graunke
committed by
Ian Romanick
Ian Romanick
parent
e8b399270d
commit
f955649af3
318
ir_reader.cpp
318
ir_reader.cpp
@@ -27,21 +27,331 @@
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#include "glsl_types.h"
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#include "s_expression.h"
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static void ir_read_error(s_expression *expr, const char *fmt, ...);
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static glsl_type *read_type(_mesa_glsl_parse_state *, s_expression *);
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static ir_rvalue *read_rvalue(_mesa_glsl_parse_state *, s_expression *);
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static ir_assignment *read_assignment(_mesa_glsl_parse_state *, s_list *);
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static ir_expression *read_expression(_mesa_glsl_parse_state *, s_list *);
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static ir_swizzle *read_swizzle(_mesa_glsl_parse_state *, s_list *);
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static ir_constant *read_constant(_mesa_glsl_parse_state *, s_list *);
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void
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_mesa_glsl_read_ir(_mesa_glsl_parse_state *state, exec_list *instructions,
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const char *src)
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{
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s_expression *expr = s_expression::read_expression(src);
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if (expr == NULL) {
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printf("couldn't parse S-Expression.");
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ir_read_error(NULL, "couldn't parse S-Expression.");
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state->error = true;
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return;
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}
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printf("S-Expression:\n");
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expr->print();
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printf("\n");
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printf("\n-------------\n");
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// FINISHME: actually read the IR.
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state->error = true;
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_mesa_glsl_initialize_types(state);
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_mesa_glsl_initialize_variables(instructions, state);
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_mesa_glsl_initialize_constructors(instructions, state);
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_mesa_glsl_initialize_functions(instructions, state);
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// FINISHME: Only reading rvalues...for testing.
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ir_instruction *ir = read_rvalue(state, SX_AS_LIST(expr));
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if (ir == NULL) {
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ir_read_error(NULL, "No IR\n");
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state->error = true;
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return;
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}
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instructions->push_tail(ir);
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}
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static void
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ir_read_error(s_expression *expr, const char *fmt, ...)
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{
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char buf[1024];
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int len;
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va_list ap;
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// FIXME: state->error = true;
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len = snprintf(buf, sizeof(buf), "error: ");
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va_start(ap, fmt);
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vsnprintf(buf + len, sizeof(buf) - len, fmt, ap);
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va_end(ap);
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printf("%s\n", buf);
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}
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static glsl_type *
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read_type(_mesa_glsl_parse_state *st, s_expression *expr)
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{
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s_list *list = SX_AS_LIST(expr);
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if (list != NULL) {
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s_symbol *type_sym = SX_AS_SYMBOL(list->subexpressions.get_head());
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if (type_sym == NULL) {
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ir_read_error(expr, "expected type (array (...)) or (struct (...))");
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return NULL;
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}
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if (strcmp(type_sym->value(), "array") == 0)
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assert(false); // FINISHME
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if (strcmp(type_sym->value(), "struct") == 0)
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assert(false); // FINISHME
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}
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s_symbol *type_sym = SX_AS_SYMBOL(expr);
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if (type_sym == NULL) {
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ir_read_error(expr, "expected <type> (symbol or list)");
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return NULL;
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}
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glsl_type *type = st->symbols->get_type(type_sym->value());
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if (type == NULL)
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ir_read_error(expr, "invalid type: %s", type_sym->value());
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return type;
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}
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static ir_rvalue *
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read_rvalue(_mesa_glsl_parse_state *st, s_expression *expr)
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{
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s_list *list = SX_AS_LIST(expr);
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if (list == NULL || list->subexpressions.is_empty())
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return NULL;
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s_symbol *tag = SX_AS_SYMBOL(list->subexpressions.get_head());
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if (tag == NULL) {
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ir_read_error(expr, "expected rvalue tag");
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return NULL;
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}
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ir_rvalue *rvalue = NULL;
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if (strcmp(tag->value(), "swiz") == 0)
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rvalue = read_swizzle(st, list);
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else if (strcmp(tag->value(), "assign") == 0)
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rvalue = read_assignment(st, list);
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else if (strcmp(tag->value(), "expression") == 0)
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rvalue = read_expression(st, list);
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// FINISHME: ir_call
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// FINISHME: dereference
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else if (strcmp(tag->value(), "constant") == 0)
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rvalue = read_constant(st, list);
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else
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ir_read_error(expr, "unrecognized rvalue tag: %s", tag->value());
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return rvalue;
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}
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static ir_assignment *
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read_assignment(_mesa_glsl_parse_state *st, s_list *list)
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{
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if (list->length() != 4) {
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ir_read_error(list, "expected (assign <condition> <lhs> <rhs>)");
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return NULL;
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}
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s_expression *cond_expr = (s_expression*) list->subexpressions.head->next;
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s_expression *lhs_expr = (s_expression*) cond_expr->next;
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s_expression *rhs_expr = (s_expression*) lhs_expr->next;
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// FINISHME: Deal with "true" condition
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ir_rvalue *condition = read_rvalue(st, cond_expr);
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if (condition == NULL) {
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ir_read_error(list, "when reading condition of assignment");
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return NULL;
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}
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ir_rvalue *lhs = read_rvalue(st, lhs_expr);
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if (lhs == NULL) {
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ir_read_error(list, "when reading left-hand side of assignment");
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return NULL;
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}
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ir_rvalue *rhs = read_rvalue(st, rhs_expr);
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if (rhs == NULL) {
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ir_read_error(list, "when reading right-hand side of assignment");
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return NULL;
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}
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return new ir_assignment(lhs, rhs, condition);
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}
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static ir_expression *
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read_expression(_mesa_glsl_parse_state *st, s_list *list)
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{
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const unsigned list_length = list->length();
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if (list_length < 4) {
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ir_read_error(list, "expected (expression <type> <operator> <operand> "
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"[<operand>])");
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return NULL;
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}
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s_expression *type_expr = (s_expression*) list->subexpressions.head->next;
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glsl_type *type = read_type(st, type_expr);
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if (type == NULL)
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return NULL;
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/* Read the operator */
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s_symbol *op_sym = SX_AS_SYMBOL(type_expr->next);
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if (op_sym == NULL) {
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ir_read_error(list, "expected operator, found non-symbol");
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return NULL;
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}
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ir_expression_operation op = ir_expression::get_operator(op_sym->value());
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if (op == (ir_expression_operation) -1) {
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ir_read_error(list, "invalid operator: %s", op_sym->value());
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return NULL;
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}
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/* Now that we know the operator, check for the right number of operands */
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if (ir_expression::get_num_operands(op) == 2) {
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if (list_length != 5) {
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ir_read_error(list, "expected (expression %s <operand1> <operand2>)",
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op_sym->value());
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return NULL;
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}
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} else {
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if (list_length != 4) {
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ir_read_error(list, "expected (expression %s <operand>)",
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op_sym->value());
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return NULL;
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}
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}
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s_expression *exp1 = (s_expression*) (op_sym->next);
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ir_rvalue *arg1 = read_rvalue(st, exp1);
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if (arg1 == NULL) {
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ir_read_error(list, "when reading first operand of %s", op_sym->value());
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return NULL;
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}
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ir_rvalue *arg2 = NULL;
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if (ir_expression::get_num_operands(op) == 2) {
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s_expression *exp2 = (s_expression*) (exp1->next);
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arg2 = read_rvalue(st, exp2);
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if (arg2 == NULL) {
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ir_read_error(list, "when reading second operand of %s",
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op_sym->value());
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return NULL;
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}
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}
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return new ir_expression(op, type, arg1, arg2);
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}
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static ir_swizzle *
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read_swizzle(_mesa_glsl_parse_state *st, s_list *list)
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{
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if (list->length() != 3) {
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ir_read_error(list, "expected (swiz <swizzle> <rvalue>)");
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return NULL;
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}
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s_symbol *swiz = SX_AS_SYMBOL(list->subexpressions.head->next);
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if (swiz == NULL) {
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ir_read_error(list, "expected a valid swizzle; found non-symbol");
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return NULL;
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}
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unsigned num_components = strlen(swiz->value());
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if (num_components > 4) {
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ir_read_error(list, "expected a valid swizzle; found %s", swiz->value());
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return NULL;
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}
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s_expression *sub = (s_expression*) swiz->next;
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if (sub == NULL) {
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ir_read_error(list, "expected rvalue: (swizzle %s <rvalue>)", swiz->value());
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return NULL;
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}
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ir_rvalue *rvalue = read_rvalue(st, sub);
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if (rvalue == NULL)
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return NULL;
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return ir_swizzle::create(rvalue, swiz->value(), num_components);
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}
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static ir_constant *
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read_constant(_mesa_glsl_parse_state *st, s_list *list)
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{
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if (list->length() != 3) {
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ir_read_error(list, "expected (constant <type> (<num> ... <num>))");
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return NULL;
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}
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s_expression *type_expr = (s_expression*) list->subexpressions.head->next;
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glsl_type *type = read_type(st, type_expr);
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if (type == NULL)
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return NULL;
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s_list *values = SX_AS_LIST(type_expr->next);
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if (values == NULL) {
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ir_read_error(list, "expected (constant <type> (<num> ... <num>))");
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return NULL;
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}
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const glsl_type *const base_type = type->get_base_type();
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unsigned u[16];
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int i[16];
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float f[16];
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bool b[16];
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// Read in list of values (at most 16).
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int k = 0;
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foreach_iter(exec_list_iterator, it, values->subexpressions) {
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if (k >= 16) {
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ir_read_error(values, "expected at most 16 numbers");
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return NULL;
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}
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s_expression *expr = (s_expression*) it.get();
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if (base_type->base_type == GLSL_TYPE_FLOAT) {
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s_number *value = SX_AS_NUMBER(expr);
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if (value == NULL) {
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ir_read_error(values, "expected numbers");
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return NULL;
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}
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f[k] = value->fvalue();
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} else {
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s_int *value = SX_AS_INT(expr);
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if (value == NULL) {
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ir_read_error(values, "expected integers");
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return NULL;
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}
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switch (base_type->base_type) {
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case GLSL_TYPE_UINT: {
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u[k] = value->value();
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break;
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}
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case GLSL_TYPE_INT: {
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i[k] = value->value();
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break;
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}
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case GLSL_TYPE_BOOL: {
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b[k] = value->value();
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break;
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}
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default:
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ir_read_error(values, "unsupported constant type");
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return NULL;
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}
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}
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++k;
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}
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switch (base_type->base_type) {
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case GLSL_TYPE_UINT:
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return new ir_constant(type, u);
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case GLSL_TYPE_INT:
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return new ir_constant(type, i);
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case GLSL_TYPE_BOOL:
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return new ir_constant(type, b);
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case GLSL_TYPE_FLOAT:
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return new ir_constant(type, f);
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}
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return NULL; // should not be reached
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}
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