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glsl: Avoid cascading errors when looking for a scalar boolean and failing.

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By always using a boolean, we should generally avoid further
complaints.  The failure case I see is logic_not, where the user might
understandably make the mistake of using `!' on a boolean vector (like
a piglit case did recently!), and then get a further complaint that
the new boolean type doesn't match the bvec it gets assigned to.

Fixes invalid-logic-not-06.vert (assertion failure when the bad type
ends up in an expression and ir_constant_expression gets angry).

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=33314
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
This commit is contained in:
Eric Anholt
2011-04-09 15:59:20 -10:00
parent 6a35cbb656
commit 01822706ec
1 changed files with 48 additions and 76 deletions
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124
src/glsl/ast_to_hir.cpp
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@@ -848,6 +848,36 @@ do_comparison(void *mem_ctx, int operation, ir_rvalue *op0, ir_rvalue *op1)
return cmp;
}
/* For logical operations, we want to ensure that the operands are
* scalar booleans. If it isn't, emit an error and return a constant
* boolean to avoid triggering cascading error messages.
*/
ir_rvalue *
get_scalar_boolean_operand(exec_list *instructions,
struct _mesa_glsl_parse_state *state,
ast_expression *parent_expr,
int operand,
const char *operand_name,
bool *error_emitted)
{
ast_expression *expr = parent_expr->subexpressions[operand];
void *ctx = state;
ir_rvalue *val = expr->hir(instructions, state);
if (val->type->is_boolean() && val->type->is_scalar())
return val;
if (!*error_emitted) {
YYLTYPE loc = expr->get_location();
_mesa_glsl_error(&loc, state, "%s of `%s' must be scalar boolean",
operand_name,
parent_expr->operator_string(parent_expr->oper));
*error_emitted = true;
}
return new(ctx) ir_constant(true);
}
ir_rvalue *
ast_expression::hir(exec_list *instructions,
struct _mesa_glsl_parse_state *state)
@@ -1079,30 +1109,14 @@ ast_expression::hir(exec_list *instructions,
break;
case ast_logic_and: {
op[0] = this->subexpressions[0]->hir(instructions, state);
if (!op[0]->type->is_boolean() || !op[0]->type->is_scalar()) {
YYLTYPE loc = this->subexpressions[0]->get_location();
_mesa_glsl_error(& loc, state, "LHS of `%s' must be scalar boolean",
operator_string(this->oper));
error_emitted = true;
}
op[0] = get_scalar_boolean_operand(instructions, state, this, 0,
"LHS", &error_emitted);
ir_constant *op0_const = op[0]->constant_expression_value();
if (op0_const) {
if (op0_const->value.b[0]) {
op[1] = this->subexpressions[1]->hir(instructions, state);
if (!op[1]->type->is_boolean() || !op[1]->type->is_scalar()) {
YYLTYPE loc = this->subexpressions[1]->get_location();
_mesa_glsl_error(& loc, state,
"RHS of `%s' must be scalar boolean",
operator_string(this->oper));
error_emitted = true;
}
result = op[1];
result = get_scalar_boolean_operand(instructions, state, this, 1,
"RHS", &error_emitted);
} else {
result = op0_const;
}
@@ -1116,16 +1130,9 @@ ast_expression::hir(exec_list *instructions,
ir_if *const stmt = new(ctx) ir_if(op[0]);
instructions->push_tail(stmt);
op[1] = this->subexpressions[1]->hir(&stmt->then_instructions, state);
if (!op[1]->type->is_boolean() || !op[1]->type->is_scalar()) {
YYLTYPE loc = this->subexpressions[1]->get_location();
_mesa_glsl_error(& loc, state,
"RHS of `%s' must be scalar boolean",
operator_string(this->oper));
error_emitted = true;
}
op[1] = get_scalar_boolean_operand(&stmt->then_instructions,
state, this, 1,
"RHS", &error_emitted);
ir_dereference *const then_deref = new(ctx) ir_dereference_variable(tmp);
ir_assignment *const then_assign =
@@ -1144,32 +1151,16 @@ ast_expression::hir(exec_list *instructions,
}
case ast_logic_or: {
op[0] = this->subexpressions[0]->hir(instructions, state);
if (!op[0]->type->is_boolean() || !op[0]->type->is_scalar()) {
YYLTYPE loc = this->subexpressions[0]->get_location();
_mesa_glsl_error(& loc, state, "LHS of `%s' must be scalar boolean",
operator_string(this->oper));
error_emitted = true;
}
op[0] = get_scalar_boolean_operand(instructions, state, this, 0,
"LHS", &error_emitted);
ir_constant *op0_const = op[0]->constant_expression_value();
if (op0_const) {
if (op0_const->value.b[0]) {
result = op0_const;
} else {
op[1] = this->subexpressions[1]->hir(instructions, state);
if (!op[1]->type->is_boolean() || !op[1]->type->is_scalar()) {
YYLTYPE loc = this->subexpressions[1]->get_location();
_mesa_glsl_error(& loc, state,
"RHS of `%s' must be scalar boolean",
operator_string(this->oper));
error_emitted = true;
}
result = op[1];
result = get_scalar_boolean_operand(instructions, state, this, 1,
"RHS", &error_emitted);
}
type = glsl_type::bool_type;
} else {
@@ -1181,15 +1172,9 @@ ast_expression::hir(exec_list *instructions,
ir_if *const stmt = new(ctx) ir_if(op[0]);
instructions->push_tail(stmt);
op[1] = this->subexpressions[1]->hir(&stmt->else_instructions, state);
if (!op[1]->type->is_boolean() || !op[1]->type->is_scalar()) {
YYLTYPE loc = this->subexpressions[1]->get_location();
_mesa_glsl_error(& loc, state, "RHS of `%s' must be scalar boolean",
operator_string(this->oper));
error_emitted = true;
}
op[1] = get_scalar_boolean_operand(&stmt->else_instructions,
state, this, 1,
"RHS", &error_emitted);
ir_dereference *const then_deref = new(ctx) ir_dereference_variable(tmp);
ir_assignment *const then_assign =
@@ -1218,15 +1203,8 @@ ast_expression::hir(exec_list *instructions,
break;
case ast_logic_not:
op[0] = this->subexpressions[0]->hir(instructions, state);
if (!op[0]->type->is_boolean() || !op[0]->type->is_scalar()) {
YYLTYPE loc = this->subexpressions[0]->get_location();
_mesa_glsl_error(& loc, state,
"operand of `!' must be scalar boolean");
error_emitted = true;
}
op[0] = get_scalar_boolean_operand(instructions, state, this, 0,
"operand", &error_emitted);
result = new(ctx) ir_expression(operations[this->oper], glsl_type::bool_type,
op[0], NULL);
@@ -1313,20 +1291,14 @@ ast_expression::hir(exec_list *instructions,
}
case ast_conditional: {
op[0] = this->subexpressions[0]->hir(instructions, state);
/* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
*
* "The ternary selection operator (?:). It operates on three
* expressions (exp1 ? exp2 : exp3). This operator evaluates the
* first expression, which must result in a scalar Boolean."
*/
if (!op[0]->type->is_boolean() || !op[0]->type->is_scalar()) {
YYLTYPE loc = this->subexpressions[0]->get_location();
_mesa_glsl_error(& loc, state, "?: condition must be scalar boolean");
error_emitted = true;
}
op[0] = get_scalar_boolean_operand(instructions, state, this, 0,
"condition", &error_emitted);
/* The :? operator is implemented by generating an anonymous temporary
* followed by an if-statement. The last instruction in each branch of