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
|
/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
* This program 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 General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*/
#ifndef SCI_ENGINE_VM_TYPES_H
#define SCI_ENGINE_VM_TYPES_H
#include "common/scummsys.h"
namespace Sci {
// Segment ID type
typedef uint16 SegmentId;
struct reg_t {
SegmentId segment;
uint16 offset;
inline bool isNull() const {
return (offset | segment) == 0;
}
inline uint16 toUint16() const {
return offset;
}
inline int16 toSint16() const {
return (int16)offset;
}
bool isNumber() const {
return segment == 0;
}
bool isPointer() const {
return segment != 0 && segment != 0xFFFF;
}
uint16 requireUint16() const;
int16 requireSint16() const;
inline bool isInitialized() const {
return segment != 0xFFFF;
}
// Comparison operators
bool operator==(const reg_t &x) const {
return (offset == x.offset) && (segment == x.segment);
}
bool operator!=(const reg_t &x) const {
return (offset != x.offset) || (segment != x.segment);
}
bool operator>(const reg_t right) const {
return cmp(right, false) > 0;
}
bool operator>=(const reg_t right) const {
return cmp(right, false) >= 0;
}
bool operator<(const reg_t right) const {
return cmp(right, false) < 0;
}
bool operator<=(const reg_t right) const {
return cmp(right, false) <= 0;
}
// Same as the normal operators, but perform unsigned
// integer checking
bool gtU(const reg_t right) const {
return cmp(right, true) > 0;
}
bool geU(const reg_t right) const {
return cmp(right, true) >= 0;
}
bool ltU(const reg_t right) const {
return cmp(right, true) < 0;
}
bool leU(const reg_t right) const {
return cmp(right, true) <= 0;
}
// Arithmetic operators
reg_t operator+(const reg_t right) const;
reg_t operator-(const reg_t right) const;
reg_t operator*(const reg_t right) const;
reg_t operator/(const reg_t right) const;
reg_t operator%(const reg_t right) const;
reg_t operator>>(const reg_t right) const;
reg_t operator<<(const reg_t right) const;
reg_t operator+(int16 right) const;
reg_t operator-(int16 right) const;
void operator+=(const reg_t &right) { *this = *this + right; }
void operator-=(const reg_t &right) { *this = *this - right; }
void operator+=(int16 right) { *this = *this + right; }
void operator-=(int16 right) { *this = *this - right; }
// Boolean operators
reg_t operator&(const reg_t right) const;
reg_t operator|(const reg_t right) const;
reg_t operator^(const reg_t right) const;
private:
/**
* Compares two reg_t's.
* Returns:
* - a positive number if *this > right
* - 0 if *this == right
* - a negative number if *this < right
*/
int cmp(const reg_t right, bool treatAsUnsigned) const;
reg_t lookForWorkaround(const reg_t right) const;
bool pointerComparisonWithInteger(const reg_t right) const;
};
static inline reg_t make_reg(SegmentId segment, uint16 offset) {
reg_t r;
r.offset = offset;
r.segment = segment;
return r;
}
#define PRINT_REG(r) (0xffff) & (unsigned) (r).segment, (unsigned) (r).offset
// Stack pointer type
typedef reg_t *StackPtr;
enum {
/**
* Special reg_t 'offset' used to indicate an error, or that an operation has
* finished (depending on the case).
* @see SIGNAL_REG
*/
SIGNAL_OFFSET = 0xffff
};
extern const reg_t NULL_REG;
extern const reg_t SIGNAL_REG;
extern const reg_t TRUE_REG;
// Selector ID
typedef int Selector;
enum {
/** Special 'selector' value, used when calling add_exec_stack_entry. */
NULL_SELECTOR = -1
};
} // End of namespace Sci
#endif // SCI_ENGINE_VM_TYPES_H
|
