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
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
|
/* Copyright (c) 2017, Curtis McEnroe <programble@gmail.com>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
// JIT RPN calculator.
#include <err.h>
#include <histedit.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/mman.h>
#include <sysexits.h>
#include <unistd.h>
typedef unsigned long qop;
typedef unsigned int dop;
typedef long qvalue;
typedef int dvalue;
typedef unsigned long uvalue;
typedef qvalue *(*jitFn)(qvalue *);
typedef void (*rtFn)(qvalue);
static char *formatBin(qvalue val) {
static char buf[sizeof(qvalue) * 8 + 1];
uvalue uval = val;
size_t i = sizeof(buf);
do {
buf[--i] = '0' + (uval & 1);
} while (uval >>= 1);
return &buf[i];
}
static void rtPrintAscii(qvalue val) {
printf("%c\n", (char)val);
}
static void rtPrintBin(qvalue val) {
printf("%s\n", formatBin(val));
}
static void rtPrintOct(qvalue val) {
printf("%lo\n", val);
}
static void rtPrintDec(qvalue val) {
printf("%ld\n", val);
}
static void rtPrintHex(qvalue val) {
printf("%lx\n", val);
}
static const dop DOP_NOP = 0x90666666; // nop
static const dop DOP_PUSH = 0xc7c74857; // push rdi; mov rdi, strict dword 0
static const dop DOP_DROP = 0x9066665f; // pop rdi
static const dop DOP_DUP = 0x90666657; // push rdi
static const dop DOP_SWAP = 0x243c8748; // xchg rdi, [rsp]
static const dop DOP_NEG = 0x90dff748; // neg rdi
static const dop DOP_ADD = 0xc7014858; // pop rax; add rdi, rax
static const dop DOP_QUO = 0x90c78948; // mov rdi, rax
static const dop DOP_REM = 0x90d78948; // mov rdi, rdx
static const dop DOP_NOT = 0x90d7f748; // not rdi
static const dop DOP_AND = 0xc7214858; // pop rax; and rdi, rax
static const dop DOP_OR = 0xc7094858; // pop rax; or rdi, rax
static const dop DOP_XOR = 0xc7314858; // pop rax; xor rdi, rax
static const qop QOP_PROL = 0x5ffc8948e5894855; // push rbp; mov rbp, rsp; mov rsp, rdi; pop rdi
static const qop QOP_EPIL = 0x5dec8948e0894857; // push rdi; mov rax, rsp; mov rsp, rbp; pop rbp
static const qop QOP_RET = 0x90666666906666c3; // ret
static const qop QOP_CRT = 0xb848906690e58748; // xchg rsp, rbp; mov rax, strict qword 0
static const qop QOP_CALL = 0x90665fe58748d0ff; // call rax; xchg rsp, rbp; pop rdi
static const qop QOP_PUSH = 0xbf48906690666657; // push rdi; mov rdi, strict qword 0
static const qop QOP_SUB = 0x9066665f243c2948; // sub [rsp], rdi; pop rdi
static const qop QOP_MUL = 0x906666f8af0f4858; // pop rax; imul rdi, rax
static const qop QOP_DIV = 0x9066fff748994858; // pop rax; cqo; idiv rdi
static const qop QOP_SHL = 0x5f2424d348f98948; // mov rcx, rdi; shl qword [rsp], cl; pop rdi
static const qop QOP_SHR = 0x5f242cd348f98948; // mov rcx, rdi; shr qword [rsp], cl; pop rdi
static int radix = 10;
static struct {
qop *base;
qop *ptr;
dop dop;
} code;
static struct {
qvalue *base;
qvalue *limit;
qvalue *ptr;
} stack;
static void jitDop(dop op) {
if (code.dop) {
*code.ptr++ = (qop)op << 32 | code.dop;
code.dop = 0;
} else {
code.dop = op;
}
}
static void jitQop(qop op) {
if (code.dop) jitDop(DOP_NOP);
*code.ptr++ = op;
}
static void jitPush(qvalue imm) {
if ((dvalue)imm == imm) {
jitQop(DOP_PUSH | (qop)imm << 32);
} else {
jitQop(QOP_PUSH);
jitQop((qop)imm);
}
}
static void jitCall(rtFn fn) {
jitQop(QOP_CRT);
jitQop((qop)fn);
jitQop(QOP_CALL);
}
static void jitBegin(void) {
code.ptr = code.base;
jitQop(QOP_PROL);
}
static void jitEnd(void) {
jitQop(QOP_EPIL);
jitQop(QOP_RET);
}
static void jitInit(void) {
code.base = mmap(0, getpagesize(), PROT_READ | PROT_WRITE, MAP_ANON | MAP_PRIVATE, -1, 0);
if (code.base == MAP_FAILED) err(EX_OSERR, "mmap");
}
static void stackInit(void) {
stack.base = mmap(0, 2 * getpagesize(), PROT_READ | PROT_WRITE, MAP_ANON | MAP_PRIVATE, -1, 0);
if (stack.base == MAP_FAILED) err(EX_OSERR, "mmap");
stack.limit = stack.base + getpagesize() / sizeof(qvalue);
stack.ptr = stack.limit;
}
static void jitExec(void) {
int error;
error = mprotect(code.base, getpagesize(), PROT_READ | PROT_EXEC);
if (error) err(EX_OSERR, "mprotect");
stack.ptr = ((jitFn)code.base)(stack.ptr);
if (stack.ptr > stack.limit) stack.ptr = stack.limit;
error = mprotect(code.base, getpagesize(), PROT_READ | PROT_WRITE);
if (error) err(EX_OSERR, "mprotect");
}
static void jitSrc(const char *src) {
bool quote = false;
while (*src) {
if (quote) {
jitPush(*src++);
quote = false;
continue;
}
switch (*src) {
case ' ': break;
case 39: quote = true; break;
case 'B': radix = 2; break;
case 'O': radix = 8; break;
case 'D': radix = 10; break;
case 'X': radix = 16; break;
case ';': jitDop(DOP_DROP); break;
case ':': jitDop(DOP_DUP); break;
case 92: jitDop(DOP_SWAP); break;
case '_': jitDop(DOP_NEG); break;
case '+': jitDop(DOP_ADD); break;
case '-': jitQop(QOP_SUB); break;
case '*': jitQop(QOP_MUL); break;
case '/': jitQop(QOP_DIV); jitDop(DOP_QUO); break;
case '%': jitQop(QOP_DIV); jitDop(DOP_REM); break;
case '~': jitDop(DOP_NOT); break;
case '&': jitDop(DOP_AND); break;
case '|': jitDop(DOP_OR); break;
case '^': jitDop(DOP_XOR); break;
case '<': jitQop(QOP_SHL); break;
case '>': jitQop(QOP_SHR); break;
case ',': jitCall(rtPrintAscii); break;
case '.': switch (radix) {
case 2: jitCall(rtPrintBin); break;
case 8: jitCall(rtPrintOct); break;
case 10: jitCall(rtPrintDec); break;
case 16: jitCall(rtPrintHex); break;
} break;
default: {
char *rest;
qvalue val = strtol(src, &rest, radix);
if (rest != src) {
src = rest;
jitPush(val);
continue;
}
}
}
src++;
}
}
static void jitDump(const char *path, FILE *file) {
size_t nitems = code.ptr - code.base;
size_t written = fwrite(code.base, sizeof(qop), nitems, file);
if (written < nitems) err(EX_IOERR, "%s", path);
}
static char *prompt(EditLine *el __attribute((unused))) {
static char buf[4096];
char *bufPtr = buf;
for (qvalue *stackPtr = stack.limit - 1; stackPtr >= stack.ptr; --stackPtr) {
size_t bufLen = sizeof(buf) - (bufPtr - buf) - 2;
switch (radix) {
case 2: bufPtr += snprintf(bufPtr, bufLen, " %s", formatBin(*stackPtr)); break;
case 8: bufPtr += snprintf(bufPtr, bufLen, " %lo", *stackPtr); break;
case 10: bufPtr += snprintf(bufPtr, bufLen, " %ld", *stackPtr); break;
case 16: bufPtr += snprintf(bufPtr, bufLen, " %lx", *stackPtr); break;
}
}
buf[0] = '[';
if (bufPtr == buf) bufPtr++;
*bufPtr++ = ']';
*bufPtr++ = ' ';
*bufPtr = 0;
return buf;
}
int main(int argc, char *argv[]) {
FILE *file = NULL;
char *path = getenv("JRP_DUMP");
if (path) {
file = fopen(path, "w");
if (!file) err(EX_CANTCREAT, "%s", path);
}
jitInit();
stackInit();
if (argc > 1) {
jitBegin();
for (int i = 1; i < argc; ++i)
jitSrc(argv[i]);
jitEnd();
if (file) jitDump(path, file);
jitExec();
return EX_OK;
}
EditLine *el = el_init(argv[0], stdin, stdout, stderr);
el_set(el, EL_PROMPT, prompt);
el_set(el, EL_SIGNAL, true);
for (;;) {
int count;
const char *line = el_gets(el, &count);
if (count < 0) err(EX_IOERR, "el_gets");
if (!line) break;
jitBegin();
jitSrc(line);
jitEnd();
if (file) jitDump(path, file);
jitExec();
}
el_end(el);
return EX_OK;
}
|