ir_constant_visitor: Type of constant result is same as original expression

The type of the resulting constant must be the same as the type of the
original expression.  The changes to the code require that the case
where an unhandled expression is received, and there really shouldn't
be any of these, must be an exit point.

1 files changed, 26 insertions, 44 deletions

diff --git a/ir_constant_expression.cpp b/ir_constant_expression.cpp
index 3a3d994302..5bb592079a 100644
--- a/ir_constant_expression.cpp
+++ b/ir_constant_expression.cpp
@@ -132,7 +132,6 @@ ir_constant_visitor::visit(ir_expression *ir)
    ir_constant *op[2];
    unsigned int operand, c;
    ir_constant_data data;
-   const glsl_type *type = NULL;
 
    for (operand = 0; operand < ir->get_num_operands(); operand++) {
       op[operand] = ir->operands[operand]->constant_expression_value();
@@ -142,15 +141,13 @@ ir_constant_visitor::visit(ir_expression *ir)
 
    switch (ir->operation) {
    case ir_unop_logic_not:
-      type = ir->operands[0]->type;
-      assert(type->base_type == GLSL_TYPE_BOOL);
+      assert(op[0]->type->base_type == GLSL_TYPE_BOOL);
       for (c = 0; c < ir->operands[0]->type->components(); c++)
 	 data.b[c] = !op[0]->value.b[c];
       break;
 
    case ir_unop_f2i:
       assert(op[0]->type->base_type == GLSL_TYPE_FLOAT);
-      type = ir->type;
       for (c = 0; c < ir->operands[0]->type->components(); c++) {
 	 data.i[c] = op[0]->value.f[c];
       }
@@ -158,7 +155,6 @@ ir_constant_visitor::visit(ir_expression *ir)
    case ir_unop_i2f:
       assert(op[0]->type->base_type == GLSL_TYPE_UINT ||
 	     op[0]->type->base_type == GLSL_TYPE_INT);
-      type = ir->type;
       for (c = 0; c < ir->operands[0]->type->components(); c++) {
 	 if (op[0]->type->base_type == GLSL_TYPE_INT)
 	    data.f[c] = op[0]->value.i[c];
@@ -168,37 +164,32 @@ ir_constant_visitor::visit(ir_expression *ir)
       break;
    case ir_unop_b2f:
       assert(op[0]->type->base_type == GLSL_TYPE_BOOL);
-      type = ir->type;
       for (c = 0; c < ir->operands[0]->type->components(); c++) {
 	 data.f[c] = op[0]->value.b[c] ? 1.0 : 0.0;
       }
       break;
    case ir_unop_f2b:
       assert(op[0]->type->base_type == GLSL_TYPE_FLOAT);
-      type = ir->type;
       for (c = 0; c < ir->operands[0]->type->components(); c++) {
 	 data.b[c] = bool(op[0]->value.f[c]);
       }
       break;
    case ir_unop_b2i:
       assert(op[0]->type->base_type == GLSL_TYPE_BOOL);
-      type = ir->type;
       for (c = 0; c < ir->operands[0]->type->components(); c++) {
 	 data.u[c] = op[0]->value.b[c] ? 1 : 0;
       }
       break;
    case ir_unop_i2b:
       assert(op[0]->type->is_integer());
-      type = ir->type;
       for (c = 0; c < ir->operands[0]->type->components(); c++) {
 	 data.b[c] = bool(op[0]->value.u[c]);
       }
       break;
 
    case ir_unop_neg:
-      type = ir->type;
       for (c = 0; c < ir->operands[0]->type->components(); c++) {
-	 switch (type->base_type) {
+	 switch (ir->type->base_type) {
 	 case GLSL_TYPE_UINT:
 	    data.u[c] = -op[0]->value.u[c];
 	    break;
@@ -216,9 +207,8 @@ ir_constant_visitor::visit(ir_expression *ir)
 
    case ir_unop_abs:
       assert(op[0]->type->base_type == GLSL_TYPE_FLOAT);
-      type = ir->type;
       for (c = 0; c < ir->operands[0]->type->components(); c++) {
-	 switch (type->base_type) {
+	 switch (ir->type->base_type) {
 	 case GLSL_TYPE_UINT:
 	    data.u[c] = op[0]->value.u[c];
 	    break;
@@ -238,9 +228,8 @@ ir_constant_visitor::visit(ir_expression *ir)
 
    case ir_unop_rcp:
       assert(op[0]->type->base_type == GLSL_TYPE_FLOAT);
-      type = ir->type;
       for (c = 0; c < ir->operands[0]->type->components(); c++) {
-	 switch (type->base_type) {
+	 switch (ir->type->base_type) {
 	 case GLSL_TYPE_UINT:
 	    if (op[0]->value.u[c] != 0.0)
 	       data.u[c] = 1 / op[0]->value.u[c];
@@ -261,7 +250,6 @@ ir_constant_visitor::visit(ir_expression *ir)
 
    case ir_unop_rsq:
       assert(op[0]->type->base_type == GLSL_TYPE_FLOAT);
-      type = ir->type;
       for (c = 0; c < ir->operands[0]->type->components(); c++) {
 	 data.f[c] = 1.0 / sqrtf(op[0]->value.f[c]);
       }
@@ -269,7 +257,6 @@ ir_constant_visitor::visit(ir_expression *ir)
 
    case ir_unop_sqrt:
       assert(op[0]->type->base_type == GLSL_TYPE_FLOAT);
-      type = ir->type;
       for (c = 0; c < ir->operands[0]->type->components(); c++) {
 	 data.f[c] = sqrtf(op[0]->value.f[c]);
       }
@@ -277,7 +264,6 @@ ir_constant_visitor::visit(ir_expression *ir)
 
    case ir_unop_exp:
       assert(op[0]->type->base_type == GLSL_TYPE_FLOAT);
-      type = ir->type;
       for (c = 0; c < ir->operands[0]->type->components(); c++) {
 	 data.f[c] = expf(op[0]->value.f[c]);
       }
@@ -285,7 +271,6 @@ ir_constant_visitor::visit(ir_expression *ir)
 
    case ir_unop_log:
       assert(op[0]->type->base_type == GLSL_TYPE_FLOAT);
-      type = ir->type;
       for (c = 0; c < ir->operands[0]->type->components(); c++) {
 	 data.f[c] = logf(op[0]->value.f[c]);
       }
@@ -294,7 +279,6 @@ ir_constant_visitor::visit(ir_expression *ir)
    case ir_unop_dFdx:
    case ir_unop_dFdy:
       assert(op[0]->type->base_type == GLSL_TYPE_FLOAT);
-      type = ir->type;
       for (c = 0; c < ir->operands[0]->type->components(); c++) {
 	 data.f[c] = 0.0;
       }
@@ -302,7 +286,6 @@ ir_constant_visitor::visit(ir_expression *ir)
 
    case ir_binop_add:
       if (ir->operands[0]->type == ir->operands[1]->type) {
-	 type = ir->operands[0]->type;
 	 for (c = 0; c < ir->operands[0]->type->components(); c++) {
 	    switch (ir->operands[0]->type->base_type) {
 	    case GLSL_TYPE_UINT:
@@ -318,11 +301,13 @@ ir_constant_visitor::visit(ir_expression *ir)
 	       assert(0);
 	    }
 	 }
-      }
+      } else
+	 /* FINISHME: Support operations with non-equal types. */
+	 return;
+
       break;
    case ir_binop_sub:
       if (ir->operands[0]->type == ir->operands[1]->type) {
-	 type = ir->operands[0]->type;
 	 for (c = 0; c < ir->operands[0]->type->components(); c++) {
 	    switch (ir->operands[0]->type->base_type) {
 	    case GLSL_TYPE_UINT:
@@ -338,12 +323,14 @@ ir_constant_visitor::visit(ir_expression *ir)
 	       assert(0);
 	    }
 	 }
-      }
+      } else
+	 /* FINISHME: Support operations with non-equal types. */
+	 return;
+
       break;
    case ir_binop_mul:
       if (ir->operands[0]->type == ir->operands[1]->type &&
 	  !ir->operands[0]->type->is_matrix()) {
-	 type = ir->operands[0]->type;
 	 for (c = 0; c < ir->operands[0]->type->components(); c++) {
 	    switch (ir->operands[0]->type->base_type) {
 	    case GLSL_TYPE_UINT:
@@ -359,11 +346,13 @@ ir_constant_visitor::visit(ir_expression *ir)
 	       assert(0);
 	    }
 	 }
-      }
+      } else
+	 /* FINISHME: Support operations with non-equal types. */
+	 return;
+
       break;
    case ir_binop_div:
       if (ir->operands[0]->type == ir->operands[1]->type) {
-	 type = ir->operands[0]->type;
 	 for (c = 0; c < ir->operands[0]->type->components(); c++) {
 	    switch (ir->operands[0]->type->base_type) {
 	    case GLSL_TYPE_UINT:
@@ -379,29 +368,28 @@ ir_constant_visitor::visit(ir_expression *ir)
 	       assert(0);
 	    }
 	 }
-      }
+      } else
+	 /* FINISHME: Support operations with non-equal types. */
+	 return;
+
       break;
    case ir_binop_logic_and:
-      type = ir->operands[0]->type;
-      assert(type->base_type == GLSL_TYPE_BOOL);
+      assert(op[0]->type->base_type == GLSL_TYPE_BOOL);
       for (c = 0; c < ir->operands[0]->type->components(); c++)
 	 data.b[c] = op[0]->value.b[c] && op[1]->value.b[c];
       break;
    case ir_binop_logic_xor:
-      type = ir->operands[0]->type;
-      assert(type->base_type == GLSL_TYPE_BOOL);
+      assert(op[0]->type->base_type == GLSL_TYPE_BOOL);
       for (c = 0; c < ir->operands[0]->type->components(); c++)
 	 data.b[c] = op[0]->value.b[c] ^ op[1]->value.b[c];
       break;
    case ir_binop_logic_or:
-      type = ir->operands[0]->type;
-      assert(type->base_type == GLSL_TYPE_BOOL);
+      assert(op[0]->type->base_type == GLSL_TYPE_BOOL);
       for (c = 0; c < ir->operands[0]->type->components(); c++)
 	 data.b[c] = op[0]->value.b[c] || op[1]->value.b[c];
       break;
 
    case ir_binop_less:
-      type = glsl_type::bool_type;
       switch (ir->operands[0]->type->base_type) {
       case GLSL_TYPE_UINT:
 	 data.b[0] = op[0]->value.u[0] < op[1]->value.u[0];
@@ -417,7 +405,6 @@ ir_constant_visitor::visit(ir_expression *ir)
       }
       break;
    case ir_binop_greater:
-      type = glsl_type::bool_type;
       switch (ir->operands[0]->type->base_type) {
       case GLSL_TYPE_UINT:
 	 data.b[0] = op[0]->value.u[0] > op[1]->value.u[0];
@@ -433,7 +420,6 @@ ir_constant_visitor::visit(ir_expression *ir)
       }
       break;
    case ir_binop_lequal:
-      type = glsl_type::bool_type;
       switch (ir->operands[0]->type->base_type) {
       case GLSL_TYPE_UINT:
 	 data.b[0] = op[0]->value.u[0] <= op[1]->value.u[0];
@@ -449,7 +435,6 @@ ir_constant_visitor::visit(ir_expression *ir)
       }
       break;
    case ir_binop_gequal:
-      type = glsl_type::bool_type;
       switch (ir->operands[0]->type->base_type) {
       case GLSL_TYPE_UINT:
 	 data.b[0] = op[0]->value.u[0] >= op[1]->value.u[0];
@@ -466,7 +451,6 @@ ir_constant_visitor::visit(ir_expression *ir)
       break;
 
    case ir_binop_equal:
-      type = glsl_type::bool_type;
       data.b[0] = true;
       for (c = 0; c < ir->operands[0]->type->components(); c++) {
 	 switch (ir->operands[0]->type->base_type) {
@@ -488,7 +472,6 @@ ir_constant_visitor::visit(ir_expression *ir)
       }
       break;
    case ir_binop_nequal:
-      type = glsl_type::bool_type;
       data.b[0] = false;
       for (c = 0; c < ir->operands[0]->type->components(); c++) {
 	 switch (ir->operands[0]->type->base_type) {
@@ -511,12 +494,11 @@ ir_constant_visitor::visit(ir_expression *ir)
       break;
 
    default:
-      break;
+      /* FINISHME: Should handle all expression types. */
+      return;
    }
 
-   if (type) {
-      this->value = new ir_constant(type, &data);
-   }
+   this->value = new ir_constant(ir->type, &data);
 }