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/* valaccodeassignmentmodule.vala
*
* Copyright (C) 2006-2010 Jürg Billeter
* Copyright (C) 2006-2008 Raffaele Sandrini
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* Author:
* Jürg Billeter <j@bitron.ch>
* Raffaele Sandrini <raffaele@sandrini.ch>
*/
using GLib;
/**
* The link between an assignment and generated code.
*/
public class Vala.CCodeAssignmentModule : CCodeMemberAccessModule {
TargetValue emit_simple_assignment (Assignment assignment) {
if (requires_destroy (assignment.left.value_type)) {
/* unref old value */
ccode.add_expression (destroy_value (assignment.left.target_value));
}
if (assignment.operator == AssignmentOperator.SIMPLE) {
store_value (assignment.left.target_value, assignment.right.target_value, assignment.source_reference);
} else {
CCodeAssignmentOperator cop;
switch (assignment.operator) {
case AssignmentOperator.BITWISE_OR: cop = CCodeAssignmentOperator.BITWISE_OR; break;
case AssignmentOperator.BITWISE_AND: cop = CCodeAssignmentOperator.BITWISE_AND; break;
case AssignmentOperator.BITWISE_XOR: cop = CCodeAssignmentOperator.BITWISE_XOR; break;
case AssignmentOperator.ADD: cop = CCodeAssignmentOperator.ADD; break;
case AssignmentOperator.SUB: cop = CCodeAssignmentOperator.SUB; break;
case AssignmentOperator.MUL: cop = CCodeAssignmentOperator.MUL; break;
case AssignmentOperator.DIV: cop = CCodeAssignmentOperator.DIV; break;
case AssignmentOperator.PERCENT:
// FIXME Code duplication with CCodeBaseModule.visit_binary_expression()
var cleft = get_cvalue (assignment.left);
var cright = get_cvalue (assignment.right);
if (assignment.value_type.equals (double_type)) {
cfile.add_include ("math.h");
var ccall = new CCodeFunctionCall (new CCodeIdentifier ("fmod"));
ccall.add_argument (cleft);
ccall.add_argument (cright);
set_cvalue (assignment.right, ccall);
cop = CCodeAssignmentOperator.SIMPLE;
} else if (assignment.value_type.equals (float_type)) {
cfile.add_include ("math.h");
var ccall = new CCodeFunctionCall (new CCodeIdentifier ("fmodf"));
ccall.add_argument (cleft);
ccall.add_argument (cright);
set_cvalue (assignment.right, ccall);
cop = CCodeAssignmentOperator.SIMPLE;
} else {
cop = CCodeAssignmentOperator.PERCENT;
}
break;
case AssignmentOperator.SHIFT_LEFT: cop = CCodeAssignmentOperator.SHIFT_LEFT; break;
case AssignmentOperator.SHIFT_RIGHT: cop = CCodeAssignmentOperator.SHIFT_RIGHT; break;
default: assert_not_reached ();
}
CCodeExpression codenode = new CCodeAssignment (get_cvalue (assignment.left), get_cvalue (assignment.right), cop);
ccode.add_expression (codenode);
}
if (assignment.left.value_type is ArrayType && (((ArrayType) assignment.left.value_type).inline_allocated)) {
unowned Variable variable = (Variable) assignment.left.symbol_reference;
return load_variable (variable, assignment.left.target_value);
} else {
return assignment.left.target_value;
}
}
public override void visit_assignment (Assignment assignment) {
if (assignment.left.error || assignment.right.error) {
assignment.error = true;
return;
}
if (assignment.left.symbol_reference is Property) {
unowned MemberAccess ma = (MemberAccess) assignment.left;
unowned Property prop = (Property) assignment.left.symbol_reference;
store_property (prop, ma.inner, assignment.right.target_value);
assignment.target_value = assignment.right.target_value;
} else if (assignment.left.symbol_reference is Variable && is_simple_struct_creation ((Variable) assignment.left.symbol_reference, assignment.right)) {
// delegate to visit_object_creation_expression
} else {
assignment.target_value = emit_simple_assignment (assignment);
}
}
public override void store_value (TargetValue lvalue, TargetValue value, SourceReference? source_reference = null) {
var array_type = lvalue.value_type as ArrayType;
if (array_type != null && array_type.fixed_length) {
cfile.add_include ("string.h");
// it is necessary to use memcpy for fixed-length (stack-allocated) arrays
// simple assignments do not work in C
var sizeof_call = new CCodeFunctionCall (new CCodeIdentifier ("sizeof"));
sizeof_call.add_argument (new CCodeIdentifier (get_ccode_name (array_type.element_type)));
var size = new CCodeBinaryExpression (CCodeBinaryOperator.MUL, get_ccodenode (array_type.length), sizeof_call);
var ccopy = new CCodeFunctionCall (new CCodeIdentifier ("memcpy"));
ccopy.add_argument (get_cvalue_ (lvalue));
ccopy.add_argument (get_cvalue_ (value));
ccopy.add_argument (size);
ccode.add_expression (ccopy);
return;
}
var cexpr = get_cvalue_ (value);
if (get_ctype (lvalue) != null) {
cexpr = new CCodeCastExpression (cexpr, get_ctype (lvalue));
}
ccode.add_assignment (get_cvalue_ (lvalue), cexpr);
if (array_type != null && ((GLibValue) lvalue).array_length_cvalues != null) {
var glib_value = (GLibValue) value;
if (glib_value.array_length_cvalues != null) {
for (int dim = 1; dim <= array_type.rank; dim++) {
ccode.add_assignment (get_array_length_cvalue (lvalue, dim), get_array_length_cvalue (value, dim));
}
} else if (glib_value.array_null_terminated) {
requires_array_length = true;
var len_call = new CCodeFunctionCall (new CCodeIdentifier ("_vala_array_length"));
len_call.add_argument (get_cvalue_ (value));
ccode.add_assignment (get_array_length_cvalue (lvalue, 1), len_call);
} else {
for (int dim = 1; dim <= array_type.rank; dim++) {
ccode.add_assignment (get_array_length_cvalue (lvalue, dim), new CCodeConstant ("-1"));
}
}
if (array_type.rank == 1 && get_array_size_cvalue (lvalue) != null) {
ccode.add_assignment (get_array_size_cvalue (lvalue), get_array_length_cvalue (lvalue, 1));
}
}
var delegate_type = lvalue.value_type as DelegateType;
if (delegate_type != null && delegate_type.delegate_symbol.has_target) {
var lvalue_target = get_delegate_target_cvalue (lvalue);
var rvalue_target = get_delegate_target_cvalue (value);
if (lvalue_target != null) {
if (rvalue_target != null) {
ccode.add_assignment (lvalue_target, rvalue_target);
} else {
Report.error (source_reference, "Assigning delegate without required target in scope");
ccode.add_assignment (lvalue_target, new CCodeInvalidExpression ());
}
var lvalue_destroy_notify = get_delegate_target_destroy_notify_cvalue (lvalue);
var rvalue_destroy_notify = get_delegate_target_destroy_notify_cvalue (value);
if (lvalue_destroy_notify != null) {
if (rvalue_destroy_notify != null) {
ccode.add_assignment (lvalue_destroy_notify, rvalue_destroy_notify);
} else {
ccode.add_assignment (lvalue_destroy_notify, new CCodeConstant ("NULL"));
}
}
}
}
}
public override void store_local (LocalVariable local, TargetValue value, bool initializer, SourceReference? source_reference = null) {
if (!initializer && requires_destroy (local.variable_type)) {
/* unref old value */
ccode.add_expression (destroy_local (local));
}
store_value (get_local_cvalue (local), value, source_reference);
}
public override void store_parameter (Parameter param, TargetValue _value, bool capturing_parameter = false, SourceReference? source_reference = null) {
var value = _value;
bool capturing_parameter_in_coroutine = capturing_parameter && is_in_coroutine ();
var param_type = param.variable_type.copy ();
if (param.captured || is_in_coroutine ()) {
if (!param_type.value_owned && !no_implicit_copy (param_type)) {
// parameter value has been implicitly copied into a heap data structure
// treat parameter as owned
param_type.value_owned = true;
var old_coroutine = is_in_coroutine ();
if (old_coroutine) {
current_method.coroutine = false;
}
if (requires_copy (param_type) && !capturing_parameter_in_coroutine) {
// do not copy value when capturing parameter in coroutine
// as the value was already copied on coroutine initialization
value = copy_value (value, param);
}
if (old_coroutine) {
current_method.coroutine = true;
}
}
}
if (requires_destroy (param_type)) {
/* unref old value */
ccode.add_expression (destroy_parameter (param));
}
store_value (get_parameter_cvalue (param), value, source_reference);
}
public override void store_field (Field field, TargetValue? instance, TargetValue value, SourceReference? source_reference = null, bool initializer = false) {
var lvalue = get_field_cvalue (field, instance);
var type = lvalue.value_type;
if (lvalue.actual_value_type != null) {
type = lvalue.actual_value_type;
}
if (!initializer && (!(field.variable_type is DelegateType) || get_ccode_delegate_target (field)) && requires_destroy (type)) {
/* unref old value */
ccode.add_expression (destroy_field (field, instance));
}
if (initializer && instance != null && get_ccode_delegate_target (field) && get_delegate_target_cvalue (value) == null) {
unowned DelegateType delegate_type = field.variable_type as DelegateType;
if (delegate_type != null && delegate_type.delegate_symbol.has_target) {
((GLibValue) value).delegate_target_cvalue = get_cvalue_ (instance);
}
}
store_value (lvalue, value, source_reference);
}
}
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