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ir_reader: Add initial loop support; doesn't yet support break/continue.

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This commit is contained in:
Kenneth Graunke 2010-04-12 15:48:27 -07:00 • committed by Ian Romanick
parent 451381c220
commit 32b305207c
1 changed files with 30 additions and 0 deletions
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30
ir_reader.cpp
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@ -36,6 +36,7 @@ static ir_instruction *read_instruction(_mesa_glsl_parse_state *,
s_expression *);
static ir_variable *read_declaration(_mesa_glsl_parse_state *, s_list *);
static ir_if *read_if(_mesa_glsl_parse_state *, s_list *);
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 *);
@ -184,6 +185,8 @@ read_instruction(_mesa_glsl_parse_state *st, s_expression *expr)
inst = read_declaration(st, list);
} else if (strcmp(tag->value(), "if") == 0) {
inst = read_if(st, list);
} 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 {
@ -296,6 +299,33 @@ read_if(_mesa_glsl_parse_state *st, s_list *list)
}
static ir_loop *
read_loop(_mesa_glsl_parse_state *st, s_list *list)
{
if (list->length() != 6) {
ir_read_error(list, "expected (loop <counter> <from> <to> <increment> "
"<body>)");
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 ir_loop;
read_instructions(st, &loop->body_instructions, body_expr);
if (st->error) {
delete loop;
loop = NULL;
}
return loop;
}
static ir_return *
read_return(_mesa_glsl_parse_state *st, s_list *list)
{