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Side by Side Diff: pkg/compiler/lib/src/constant_system.dart

Issue 1091443003: Move constant systems into their own libraries. (Closed) Base URL: https://dart.googlecode.com/svn/branches/bleeding_edge/dart
Patch Set: Fix try/poi/forget_element_test Created 5 years, 8 months ago
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1 // Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file
2 // for details. All rights reserved. Use of this source code is governed by a
3 // BSD-style license that can be found in the LICENSE file.
4
5 part of dart2js;
6
7 abstract class Operation {
8 String get name;
9 }
10
11 abstract class UnaryOperation extends Operation {
12 /** Returns [:null:] if it was unable to fold the operation. */
13 ConstantValue fold(ConstantValue constant);
14 }
15
16 abstract class BinaryOperation extends Operation {
17 /** Returns [:null:] if it was unable to fold the operation. */
18 ConstantValue fold(ConstantValue left, ConstantValue right);
19 apply(left, right);
20 }
21
22 /**
23 * A [ConstantSystem] is responsible for creating constants and folding them.
24 */
25 abstract class ConstantSystem {
26 BinaryOperation get add;
27 BinaryOperation get bitAnd;
28 UnaryOperation get bitNot;
29 BinaryOperation get bitOr;
30 BinaryOperation get bitXor;
31 BinaryOperation get booleanAnd;
32 BinaryOperation get booleanOr;
33 BinaryOperation get divide;
34 BinaryOperation get equal;
35 BinaryOperation get greaterEqual;
36 BinaryOperation get greater;
37 BinaryOperation get identity;
38 BinaryOperation get lessEqual;
39 BinaryOperation get less;
40 BinaryOperation get modulo;
41 BinaryOperation get multiply;
42 UnaryOperation get negate;
43 UnaryOperation get not;
44 BinaryOperation get shiftLeft;
45 BinaryOperation get shiftRight;
46 BinaryOperation get subtract;
47 BinaryOperation get truncatingDivide;
48
49 BinaryOperation get codeUnitAt;
50
51 const ConstantSystem();
52
53 ConstantValue createInt(int i);
54 ConstantValue createDouble(double d);
55 ConstantValue createString(DartString string);
56 ConstantValue createBool(bool value);
57 ConstantValue createNull();
58 ConstantValue createMap(Compiler compiler,
59 InterfaceType type,
60 List<ConstantValue> keys,
61 List<ConstantValue> values);
62
63 // We need to special case the subtype check for JavaScript constant
64 // system because an int is a double at runtime.
65 bool isSubtype(DartTypes types, DartType s, DartType t);
66
67 /** Returns true if the [constant] is an integer at runtime. */
68 bool isInt(ConstantValue constant);
69 /** Returns true if the [constant] is a double at runtime. */
70 bool isDouble(ConstantValue constant);
71 /** Returns true if the [constant] is a string at runtime. */
72 bool isString(ConstantValue constant);
73 /** Returns true if the [constant] is a boolean at runtime. */
74 bool isBool(ConstantValue constant);
75 /** Returns true if the [constant] is null at runtime. */
76 bool isNull(ConstantValue constant);
77
78 UnaryOperation lookupUnary(String operator) {
79 switch (operator) {
80 case '~': return bitNot;
81 case '-': return negate;
82 case '!': return not;
83 default: return null;
84 }
85 }
86
87 BinaryOperation lookupBinary(String operator) {
88 switch (operator) {
89 case "+": return add;
90 case "-": return subtract;
91 case "*": return multiply;
92 case "/": return divide;
93 case "%": return modulo;
94 case "~/": return truncatingDivide;
95 case "|": return bitOr;
96 case "&": return bitAnd;
97 case "^": return bitXor;
98 case "||": return booleanOr;
99 case "&&": return booleanAnd;
100 case "<<": return shiftLeft;
101 case ">>": return shiftRight;
102 case "<": return less;
103 case "<=": return lessEqual;
104 case ">": return greater;
105 case ">=": return greaterEqual;
106 case "==": return equal;
107 default: return null;
108 }
109 }
110 }
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