1 /*
2 * Copyright (c) 2002, 2006, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include <stdio.h>
26 #include <string.h>
27
28 static const int R_O0_num = 1000;
29 static const int R_I0_num = 2000;
30 static const int R_F0_num = 3000;
31 static const int R_F1_num = R_F0_num + 1;
32 static const int R_F2_num = R_F0_num + 2;
33 static const int STACK_num= 4000;
34
35 static bool LP64 = false;
36 static bool LONGS_IN_ONE_ENTRY = false;
37
38 static const int Op_RegI = 'I';
39 static const int Op_RegP = 'P';
40 static const int Op_RegF = 'F';
41 static const int Op_RegD = 'D';
42 static const int Op_RegL = 'L';
43 static const int SPARC_ARGS_IN_REGS_NUM=6;
44
print_reg(int reg)45 static void print_reg( int reg ) {
46 if( reg == 0 )
47 printf("__"); // halve's
48 else if( reg >= STACK_num && reg < STACK_num+100 )
49 printf("S%d_",reg - STACK_num);
50 else if( reg >= R_F0_num && reg < R_F0_num+100 )
51 printf("F%d_",reg - R_F0_num);
52 else if( reg >= R_O0_num && reg < R_O0_num+100 ) {
53 if( LONGS_IN_ONE_ENTRY ) {
54 reg -= R_O0_num;
55 printf("O%d",reg>>1);
56 printf(reg&1 ? "H" : "L");
57 } else
58 printf("O%d_",reg - R_O0_num);
59 } else
60 printf("Wretched: %d\n", reg);
61 }
62
print_convention(int * sig,const char * s,int length)63 static void print_convention( int *sig, const char *s, int length ) {
64 // Print it out
65 for( int i = 0; i < length; i++) {
66 if( sig[i] == 0 ) continue; // do not print 'halves'
67 print_reg( sig[i] & 0xFFFF );
68 int reg = sig[i] >> 16;
69 if( reg ) {
70 printf(":");
71 print_reg( reg );
72 } else {
73 printf(" ");
74 }
75 printf(" ");
76 }
77 printf("\n");
78 }
79
INT_SCALE(int x)80 static int INT_SCALE( int x ) {
81 return LONGS_IN_ONE_ENTRY ? (x<<1) : x;
82 }
83
java_convention(int * sig,const char * s,int length)84 static void java_convention( int *sig, const char *s, int length ) {
85 if( LP64 && !LONGS_IN_ONE_ENTRY ) {
86 printf("LP64 and 2-reg longs not supported\n");
87 return;
88 }
89 for( int i = 0; i < length; i++ )
90 sig[i] = s[i]; // Reset sig array
91 bool is_outgoing = true;
92
93 int int_base = (is_outgoing ? R_O0_num : R_I0_num);
94
95 // Convention is to pack the first 6 int/oop args into the first 6
96 // registers (I0-I5), extras spill to the stack. Then pack the first
97 // 32 float args into F0-F31, extras spill to the stack. Then pad
98 // all register sets to align. Then put longs and doubles into the
99 // same registers as they fit, else spill to the stack.
100 int int_reg_max = SPARC_ARGS_IN_REGS_NUM;
101 int flt_reg_max = 32;
102
103 // Count int/oop and float args. See how many stack slots we'll need
104 // and where the longs & doubles will go.
105 int int_reg_cnt = 0;
106 int flt_reg_cnt = 0;
107 int stk_reg_pairs = 0;
108 for( int i = 0; i < length; i++) {
109 switch( sig[i] ) {
110 case Op_RegL: // Longs-in-1-reg compete with int args
111 if( LONGS_IN_ONE_ENTRY ) {
112 if( int_reg_cnt < int_reg_max ) int_reg_cnt++;
113 }
114 break;
115 case Op_RegP:
116 if( int_reg_cnt < int_reg_max ) int_reg_cnt++;
117 else if( !LP64 ) stk_reg_pairs++;
118 break;
119 case Op_RegI:
120 if( int_reg_cnt < int_reg_max ) int_reg_cnt++;
121 else stk_reg_pairs++;
122 break;
123 case Op_RegF:
124 if( flt_reg_cnt < flt_reg_max ) flt_reg_cnt++;
125 else stk_reg_pairs++;
126 break;
127 }
128 }
129
130 // This is where the longs/doubles start on the stack.
131 stk_reg_pairs = (stk_reg_pairs+1) & ~1; // Round
132
133 int int_reg_pairs = (int_reg_cnt+1) & ~1; // 32-bit 2-reg longs only
134 int flt_reg_pairs = (flt_reg_cnt+1) & ~1;
135
136 int stk_reg = 0;
137 int int_reg = 0;
138 int flt_reg = 0;
139
140 // Now do the signature layout
141 for( int i = 0; i < length; i++) {
142 int tmp = sig[i];
143 if( tmp == Op_RegP )
144 tmp = LP64 ? Op_RegL : Op_RegI; // Treat ptrs and ints or long accordingly
145 switch( tmp ) {
146 case Op_RegI:
147 // case Op_RegP:
148 if( int_reg < int_reg_max) tmp = INT_SCALE(int_reg++) + int_base;
149 else tmp = STACK_num + stk_reg++;
150 sig[i] = tmp;
151 break;
152
153 case Op_RegL:
154 if( sig[i] != Op_RegP && sig[i+1] != 'h' ) { printf("expecting (h)alf, found %c\n", sig[i+1]); return; }
155 // case Op_RegP:
156 if( LONGS_IN_ONE_ENTRY ) {
157 if( int_reg < int_reg_max ) {
158 tmp = INT_SCALE(int_reg++) + int_base;
159 } else {
160 tmp = STACK_num + stk_reg_pairs;
161 stk_reg_pairs += 2;
162 }
163 } else {
164 if( int_reg_pairs < int_reg_max ) {
165 tmp = int_reg_pairs + int_base;
166 int_reg_pairs += 2;
167 } else {
168 tmp = STACK_num + stk_reg_pairs;
169 stk_reg_pairs += 2;
170 }
171 }
172 sig[i] = tmp | (tmp+1)<<16; // Smear to pair
173 break;
174
175 case Op_RegF:
176 sig[i] = (flt_reg < flt_reg_max) ? (R_F0_num + flt_reg++) : STACK_num + stk_reg++;
177 break;
178 case Op_RegD:
179 if( sig[i+1] != 'h' ) { printf("expecting (h)alf, found %c\n", sig[i+1]); return; }
180 if( flt_reg_pairs < flt_reg_max ) {
181 tmp = R_F0_num + flt_reg_pairs;
182 flt_reg_pairs += 2;
183 } else {
184 tmp = STACK_num + stk_reg_pairs;
185 stk_reg_pairs += 2;
186 }
187 sig[i] = tmp | (tmp+1)<<16; // Smear to pair
188 break;
189 case 'h': sig[i] = 0; break;
190 default:
191 printf("Bad character: %c\n", sig[i] );
192 return;
193 }
194 }
195
196 printf("java ");
197 printf(LP64 ? "LP64 " : "LP32 ");
198 printf(LONGS_IN_ONE_ENTRY ? "long1: " : "long2: ");
199 print_convention(sig,s,length);
200 }
201
int_stk_helper(int i)202 static int int_stk_helper( int i ) {
203 if( i < 6 ) return R_O0_num + (LONGS_IN_ONE_ENTRY ? i<<1 : i);
204 else return STACK_num + (LP64 ? i<<1 : i);
205 }
206
native_convention(int * sig,const char * s,int length)207 static void native_convention( int *sig, const char *s, int length ) {
208 if( LP64 && !LONGS_IN_ONE_ENTRY ) {
209 printf("LP64 and 2-reg longs not supported\n");
210 return;
211 }
212 for( int i = 0; i < length; i++ )
213 sig[i] = s[i]; // Reset sig array
214
215 // The native convention is V8 if !LP64, which means the V8 convention is
216 // used both with and without LONGS_IN_ONE_ENTRY, an unfortunate split. The
217 // same actual machine registers are used, but they are named differently in
218 // the LONGS_IN_ONE_ENTRY mode. The LP64 convention is the V9 convention
219 // which is slightly more sane.
220
221 if( LP64 ) {
222 // V9 convention: All things "as-if" on double-wide stack slots.
223 // Hoist any int/ptr/long's in the first 6 to int regs.
224 // Hoist any flt/dbl's in the first 16 dbl regs.
225 int j = 0; // Count of actual args, not HALVES
226 for( int i=0; i<length; i++, j++ ) {
227 int tmp;
228 switch( sig[i] ) {
229 case Op_RegI:
230 sig[i] = int_stk_helper( j );
231 break;
232 case Op_RegL:
233 if( sig[i+1] != 'h' ) { printf("expecting (h)alf, found %c\n", sig[i+1]); return; }
234 case Op_RegP:
235 tmp = int_stk_helper( j );
236 sig[i] = tmp | ((tmp+1) << 16); // Smear to pair
237 break;
238 case Op_RegF: // V9ism: floats go in ODD registers
239 sig[i] = ((j < 16) ? R_F1_num : (STACK_num + 1)) + (j<<1);
240 break;
241 case Op_RegD: // V9ism: doubles go in EVEN/ODD regs
242 tmp = ((j < 16) ? R_F0_num : STACK_num) + (j<<1);
243 sig[i] = tmp | ((tmp+1) << 16); // Smear to pair
244 break;
245 case 'h': sig[i] = 0; j--; break; // Do not count HALVES
246 default:
247 printf("Bad character: %c\n", sig[i] );
248 return;
249 }
250 }
251
252 } else {
253 // V8 convention: first 6 things in O-regs, rest on stack.
254 // Alignment is willy-nilly.
255 for( int i=0; i<length; i++ ) {
256 int tmp;
257 switch( sig[i] ) {
258 case Op_RegI:
259 case Op_RegP:
260 case Op_RegF:
261 sig[i] = int_stk_helper( i );
262 break;
263 case Op_RegL:
264 case Op_RegD:
265 if( sig[i+1] != 'h' ) { printf("expecting (h)alf, found %c\n", sig[i+1]); return; }
266 tmp = int_stk_helper( i );
267 sig[i] = tmp | (int_stk_helper( i+1 ) << 16);
268 break;
269 case 'h': sig[i] = 0; break;
270 default:
271 printf("Bad character: %c\n", sig[i] );
272 return;
273 }
274 }
275 }
276
277 printf("natv ");
278 printf(LP64 ? "LP64 " : "LP32 ");
279 printf(LONGS_IN_ONE_ENTRY ? "long1: " : "long2: ");
280 print_convention(sig,s,length);
281 }
282
main(int argc,char ** argv)283 int main( int argc, char **argv ) {
284
285 if( argc != 2 ) {
286 printf("Usage: args IPFLhDh... (Java argument string)\n");
287 printf("Returns argument layout\n");
288 return -1;
289 }
290
291 const char *s = argv[1];
292 int length = strlen(s);
293 int sig[1000];
294
295 LP64 = false; LONGS_IN_ONE_ENTRY = false;
296 java_convention( sig, s, length );
297 LP64 = false; LONGS_IN_ONE_ENTRY = true;
298 java_convention( sig, s, length );
299 LP64 = true ; LONGS_IN_ONE_ENTRY = true;
300 java_convention( sig, s, length );
301
302 LP64 = false; LONGS_IN_ONE_ENTRY = false;
303 native_convention( sig, s, length );
304 LP64 = false; LONGS_IN_ONE_ENTRY = true;
305 native_convention( sig, s, length );
306 LP64 = true ; LONGS_IN_ONE_ENTRY = true;
307 native_convention( sig, s, length );
308 }
309
310