1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
|
/* 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 {
CCodeExpression? emit_property_assignment (Assignment assignment) {
var ma = assignment.left as MemberAccess;
var prop = (Property) assignment.left.symbol_reference;
if (!(prop is DynamicProperty)) {
generate_property_accessor_declaration (prop.set_accessor, cfile);
if (!prop.external && prop.external_package) {
// internal VAPI properties
// only add them once per source file
if (add_generated_external_symbol (prop)) {
visit_property (prop);
}
}
}
CCodeExpression cexpr = get_cvalue (assignment.right);
if (prop.property_type.is_real_non_null_struct_type ()) {
cexpr = get_address_of_expression (assignment.right, cexpr);
}
if (assignment.operator != AssignmentOperator.SIMPLE) {
CCodeBinaryOperator cop;
if (assignment.operator == AssignmentOperator.BITWISE_OR) {
cop = CCodeBinaryOperator.BITWISE_OR;
} else if (assignment.operator == AssignmentOperator.BITWISE_AND) {
cop = CCodeBinaryOperator.BITWISE_AND;
} else if (assignment.operator == AssignmentOperator.BITWISE_XOR) {
cop = CCodeBinaryOperator.BITWISE_XOR;
} else if (assignment.operator == AssignmentOperator.ADD) {
cop = CCodeBinaryOperator.PLUS;
} else if (assignment.operator == AssignmentOperator.SUB) {
cop = CCodeBinaryOperator.MINUS;
} else if (assignment.operator == AssignmentOperator.MUL) {
cop = CCodeBinaryOperator.MUL;
} else if (assignment.operator == AssignmentOperator.DIV) {
cop = CCodeBinaryOperator.DIV;
} else if (assignment.operator == AssignmentOperator.PERCENT) {
cop = CCodeBinaryOperator.MOD;
} else if (assignment.operator == AssignmentOperator.SHIFT_LEFT) {
cop = CCodeBinaryOperator.SHIFT_LEFT;
} else if (assignment.operator == AssignmentOperator.SHIFT_RIGHT) {
cop = CCodeBinaryOperator.SHIFT_RIGHT;
} else {
assert_not_reached ();
}
cexpr = new CCodeBinaryExpression (cop, (CCodeExpression) get_ccodenode (assignment.left), cexpr);
}
store_property (prop, ma, cexpr, assignment.right);
// assignments are expressions, so return the current property value, except if we're sure that it can't be used
if (assignment.parent_node is ExpressionStatement) {
return null;
} else {
return get_ccodenode (ma); // current property value
}
}
CCodeExpression? emit_simple_assignment (Assignment assignment) {
CCodeExpression rhs = get_cvalue (assignment.right);
CCodeExpression lhs = (CCodeExpression) get_ccodenode (assignment.left);
bool unref_old = requires_destroy (assignment.left.value_type);
bool array = false;
bool instance_delegate = false;
if (assignment.left.value_type is ArrayType) {
var array_field = assignment.left.symbol_reference as Field;
array = (array_field == null || !array_field.no_array_length);
} else if (assignment.left.value_type is DelegateType) {
var delegate_type = (DelegateType) assignment.left.value_type;
if (delegate_type.delegate_symbol.has_target) {
var delegate_field = assignment.left.symbol_reference as Field;
if (delegate_field == null || !delegate_field.no_delegate_target) {
instance_delegate = true;
}
}
}
if (unref_old || array || instance_delegate) {
if (!is_pure_ccode_expression (lhs)) {
/* Assign lhs to temp var to avoid repeating side effect */
var lhs_value_type = assignment.left.value_type.copy ();
string lhs_temp_name = "_tmp%d_".printf (next_temp_var_id++);
var lhs_temp = new LocalVariable (lhs_value_type, "*" + lhs_temp_name);
emit_temp_var (lhs_temp);
ccode.add_expression (new CCodeAssignment (get_variable_cexpression (lhs_temp_name), new CCodeUnaryExpression (CCodeUnaryOperator.ADDRESS_OF, lhs)));
lhs = new CCodeParenthesizedExpression (new CCodeUnaryExpression (CCodeUnaryOperator.POINTER_INDIRECTION, get_variable_cexpression (lhs_temp_name)));
}
var temp_decl = get_temp_variable (assignment.left.value_type, true, null, false);
emit_temp_var (temp_decl);
ccode.add_expression (new CCodeAssignment (get_variable_cexpression (temp_decl.name), rhs));
if (unref_old) {
/* unref old value */
ccode.add_expression (get_unref_expression (lhs, assignment.left.value_type, assignment.left));
}
if (array) {
var array_type = (ArrayType) assignment.left.value_type;
for (int dim = 1; dim <= array_type.rank; dim++) {
var lhs_array_len = get_array_length_cexpression (assignment.left, dim);
var rhs_array_len = get_array_length_cexpression (assignment.right, dim);
ccode.add_expression (new CCodeAssignment (lhs_array_len, rhs_array_len));
}
if (array_type.rank == 1) {
var array_var = assignment.left.symbol_reference;
var array_local = array_var as LocalVariable;
if (array_var != null && array_var.is_internal_symbol ()
&& ((array_var is LocalVariable && !array_local.captured) || array_var is Field)) {
var lhs_array_size = get_array_size_cexpression (assignment.left);
var rhs_array_len = get_array_length_cexpression (assignment.left, 1);
ccode.add_expression (new CCodeAssignment (lhs_array_size, rhs_array_len));
}
}
} else if (instance_delegate) {
CCodeExpression lhs_delegate_target_destroy_notify, rhs_delegate_target_destroy_notify;
var lhs_delegate_target = get_delegate_target_cexpression (assignment.left, out lhs_delegate_target_destroy_notify);
var rhs_delegate_target = get_delegate_target_cexpression (assignment.right, out rhs_delegate_target_destroy_notify);
ccode.add_expression (new CCodeAssignment (lhs_delegate_target, rhs_delegate_target));
if (assignment.right.target_type.value_owned) {
ccode.add_expression (new CCodeAssignment (lhs_delegate_target_destroy_notify, rhs_delegate_target_destroy_notify));
}
}
rhs = get_variable_cexpression (temp_decl.name);
}
var cop = CCodeAssignmentOperator.SIMPLE;
if (assignment.operator == AssignmentOperator.BITWISE_OR) {
cop = CCodeAssignmentOperator.BITWISE_OR;
} else if (assignment.operator == AssignmentOperator.BITWISE_AND) {
cop = CCodeAssignmentOperator.BITWISE_AND;
} else if (assignment.operator == AssignmentOperator.BITWISE_XOR) {
cop = CCodeAssignmentOperator.BITWISE_XOR;
} else if (assignment.operator == AssignmentOperator.ADD) {
cop = CCodeAssignmentOperator.ADD;
} else if (assignment.operator == AssignmentOperator.SUB) {
cop = CCodeAssignmentOperator.SUB;
} else if (assignment.operator == AssignmentOperator.MUL) {
cop = CCodeAssignmentOperator.MUL;
} else if (assignment.operator == AssignmentOperator.DIV) {
cop = CCodeAssignmentOperator.DIV;
} else if (assignment.operator == AssignmentOperator.PERCENT) {
cop = CCodeAssignmentOperator.PERCENT;
} else if (assignment.operator == AssignmentOperator.SHIFT_LEFT) {
cop = CCodeAssignmentOperator.SHIFT_LEFT;
} else if (assignment.operator == AssignmentOperator.SHIFT_RIGHT) {
cop = CCodeAssignmentOperator.SHIFT_RIGHT;
}
CCodeExpression codenode = new CCodeAssignment (lhs, rhs, cop);
ccode.add_expression (codenode);
if (assignment.parent_node is ExpressionStatement) {
return null;
} else {
return lhs;
}
}
CCodeExpression? emit_fixed_length_array_assignment (Assignment assignment, ArrayType array_type) {
CCodeExpression rhs = get_cvalue (assignment.right);
CCodeExpression lhs = (CCodeExpression) get_ccodenode (assignment.left);
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 (array_type.element_type.get_cname ()));
var size = new CCodeBinaryExpression (CCodeBinaryOperator.MUL, new CCodeConstant ("%d".printf (array_type.length)), sizeof_call);
var ccopy = new CCodeFunctionCall (new CCodeIdentifier ("memcpy"));
ccopy.add_argument (lhs);
ccopy.add_argument (rhs);
ccopy.add_argument (size);
ccode.add_expression (ccopy);
if (assignment.parent_node is ExpressionStatement) {
return null;
} else {
return lhs;
}
}
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) {
set_cvalue (assignment, emit_property_assignment (assignment));
} else {
var array_type = assignment.left.value_type as ArrayType;
if (array_type != null && array_type.fixed_length) {
set_cvalue (assignment, emit_fixed_length_array_assignment (assignment, array_type));
} else {
set_cvalue (assignment, emit_simple_assignment (assignment));
}
}
}
}
|
