github.com/xushiwei/go@v0.0.0-20130601165731-2b9d83f45bc9/src/cmd/6l/prof.c (about) 1 // Inferno utils/6l/obj.c 2 // http://code.google.com/p/inferno-os/source/browse/utils/6l/obj.c 3 // 4 // Copyright © 1994-1999 Lucent Technologies Inc. All rights reserved. 5 // Portions Copyright © 1995-1997 C H Forsyth (forsyth@terzarima.net) 6 // Portions Copyright © 1997-1999 Vita Nuova Limited 7 // Portions Copyright © 2000-2007 Vita Nuova Holdings Limited (www.vitanuova.com) 8 // Portions Copyright © 2004,2006 Bruce Ellis 9 // Portions Copyright © 2005-2007 C H Forsyth (forsyth@terzarima.net) 10 // Revisions Copyright © 2000-2007 Lucent Technologies Inc. and others 11 // Portions Copyright © 2009 The Go Authors. All rights reserved. 12 // 13 // Permission is hereby granted, free of charge, to any person obtaining a copy 14 // of this software and associated documentation files (the "Software"), to deal 15 // in the Software without restriction, including without limitation the rights 16 // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 17 // copies of the Software, and to permit persons to whom the Software is 18 // furnished to do so, subject to the following conditions: 19 // 20 // The above copyright notice and this permission notice shall be included in 21 // all copies or substantial portions of the Software. 22 // 23 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 24 // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 25 // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 26 // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 27 // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 28 // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 29 // THE SOFTWARE. 30 31 // Profiling. 32 33 #include "l.h" 34 #include "../ld/lib.h" 35 36 void 37 doprof1(void) 38 { 39 #ifdef NOTDEF 40 Sym *s; 41 int32 n; 42 Prog *p, *q; 43 44 if(debug['v']) 45 Bprint(&bso, "%5.2f profile 1\n", cputime()); 46 Bflush(&bso); 47 s = lookup("__mcount", 0); 48 n = 1; 49 for(cursym = textp; cursym != nil; cursym = cursym->next) { 50 p = cursym->text; 51 q = prg(); 52 q->line = p->line; 53 q->link = datap; 54 datap = q; 55 q->as = ADATA; 56 q->from.type = D_EXTERN; 57 q->from.offset = n*4; 58 q->from.sym = s; 59 q->from.scale = 4; 60 q->to = p->from; 61 q->to.type = D_CONST; 62 63 q = prg(); 64 q->line = p->line; 65 q->pc = p->pc; 66 q->link = p->link; 67 p->link = q; 68 p = q; 69 p->as = AADDL; 70 p->from.type = D_CONST; 71 p->from.offset = 1; 72 p->to.type = D_EXTERN; 73 p->to.sym = s; 74 p->to.offset = n*4 + 4; 75 76 n += 2; 77 } 78 q = prg(); 79 q->line = 0; 80 q->link = datap; 81 datap = q; 82 83 q->as = ADATA; 84 q->from.type = D_EXTERN; 85 q->from.sym = s; 86 q->from.scale = 4; 87 q->to.type = D_CONST; 88 q->to.offset = n; 89 90 s->type = SBSS; 91 s->size = n*4; 92 #endif 93 } 94 95 void 96 doprof2(void) 97 { 98 Sym *s2, *s4; 99 Prog *p, *q, *ps2, *ps4; 100 101 if(debug['v']) 102 Bprint(&bso, "%5.2f profile 2\n", cputime()); 103 Bflush(&bso); 104 105 s2 = lookup("_profin", 0); 106 s4 = lookup("_profout", 0); 107 if(s2->type != STEXT || s4->type != STEXT) { 108 diag("_profin/_profout not defined"); 109 return; 110 } 111 112 ps2 = P; 113 ps4 = P; 114 for(cursym = textp; cursym != nil; cursym = cursym->next) { 115 p = cursym->text; 116 if(p->from.sym == s2) { 117 p->from.scale = 1; 118 ps2 = p; 119 } 120 if(p->from.sym == s4) { 121 p->from.scale = 1; 122 ps4 = p; 123 } 124 } 125 for(cursym = textp; cursym != nil; cursym = cursym->next) { 126 p = cursym->text; 127 128 if(p->from.scale & NOPROF) /* dont profile */ 129 continue; 130 131 /* 132 * JMPL profin 133 */ 134 q = prg(); 135 q->line = p->line; 136 q->pc = p->pc; 137 q->link = p->link; 138 p->link = q; 139 p = q; 140 p->as = ACALL; 141 p->to.type = D_BRANCH; 142 p->pcond = ps2; 143 p->to.sym = s2; 144 145 for(; p; p=p->link) { 146 if(p->as == ARET) { 147 /* 148 * RET 149 */ 150 q = prg(); 151 q->as = ARET; 152 q->from = p->from; 153 q->to = p->to; 154 q->link = p->link; 155 p->link = q; 156 157 /* 158 * JAL profout 159 */ 160 p->as = ACALL; 161 p->from = zprg.from; 162 p->to = zprg.to; 163 p->to.type = D_BRANCH; 164 p->pcond = ps4; 165 p->to.sym = s4; 166 167 p = q; 168 } 169 } 170 } 171 }