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
|
// Inferno utils/6c/swt.c
// http://code.google.com/p/inferno-os/source/browse/utils/6c/swt.c
//
// Copyright © 1994-1999 Lucent Technologies Inc. All rights reserved.
// Portions Copyright © 1995-1997 C H Forsyth (forsyth@terzarima.net)
// Portions Copyright © 1997-1999 Vita Nuova Limited
// Portions Copyright © 2000-2007 Vita Nuova Holdings Limited (www.vitanuova.com)
// Portions Copyright © 2004,2006 Bruce Ellis
// Portions Copyright © 2005-2007 C H Forsyth (forsyth@terzarima.net)
// Revisions Copyright © 2000-2007 Lucent Technologies Inc. and others
// Portions Copyright © 2009 The Go Authors. All rights reserved.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
#include "gc.h"
int
swcmp(const void *a1, const void *a2)
{
C1 *p1, *p2;
p1 = (C1*)a1;
p2 = (C1*)a2;
if(p1->val < p2->val)
return -1;
return p1->val > p2->val;
}
void
doswit(Node *n)
{
Case *c;
C1 *q, *iq;
int32 def, nc, i, isv;
def = 0;
nc = 0;
isv = 0;
for(c = cases; c->link != C; c = c->link) {
if(c->def) {
if(def)
diag(n, "more than one default in switch");
def = c->label;
continue;
}
isv |= c->isv;
nc++;
}
if(isv && !typev[n->type->etype])
warn(n, "32-bit switch expression with 64-bit case constant");
iq = alloc(nc*sizeof(C1));
q = iq;
for(c = cases; c->link != C; c = c->link) {
if(c->def)
continue;
q->label = c->label;
if(isv)
q->val = c->val;
else
q->val = (int32)c->val; /* cast ensures correct value for 32-bit switch on 64-bit architecture */
q++;
}
qsort(iq, nc, sizeof(C1), swcmp);
if(debug['W'])
for(i=0; i<nc; i++)
print("case %2d: = %.8llux\n", i, (vlong)iq[i].val);
for(i=0; i<nc-1; i++)
if(iq[i].val == iq[i+1].val)
diag(n, "duplicate cases in switch %lld", (vlong)iq[i].val);
if(def == 0) {
def = breakpc;
nbreak++;
}
swit1(iq, nc, def, n);
}
void
cas(void)
{
Case *c;
c = alloc(sizeof(*c));
c->link = cases;
cases = c;
}
int32
outlstring(ushort *s, int32 n)
{
char buf[2];
int c;
int32 r;
if(suppress)
return nstring;
while(nstring & 1)
outstring("", 1);
r = nstring;
while(n > 0) {
c = *s++;
if(align(0, types[TCHAR], Aarg1, nil)) {
buf[0] = c>>8;
buf[1] = c;
} else {
buf[0] = c;
buf[1] = c>>8;
}
outstring(buf, 2);
n -= sizeof(ushort);
}
return r;
}
void
nullwarn(Node *l, Node *r)
{
warn(Z, "result of operation not used");
if(l != Z)
cgen(l, Z);
if(r != Z)
cgen(r, Z);
}
void
ieeedtod(Ieee *ieee, double native)
{
double fr, ho, f;
int exp;
if(native < 0) {
ieeedtod(ieee, -native);
ieee->h |= 0x80000000L;
return;
}
if(native == 0) {
ieee->l = 0;
ieee->h = 0;
return;
}
fr = frexp(native, &exp);
f = 2097152L; /* shouldnt use fp constants here */
fr = modf(fr*f, &ho);
ieee->h = ho;
ieee->h &= 0xfffffL;
ieee->h |= (exp+1022L) << 20;
f = 65536L;
fr = modf(fr*f, &ho);
ieee->l = ho;
ieee->l <<= 16;
ieee->l |= (int32)(fr*f);
}
|
