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1 | /* deb.c |
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2 | * |
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3 | * Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1998, 1999, |
4 | * 2000, 2001, 2002, by Larry Wall and others |
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5 | * |
6 | * You may distribute under the terms of either the GNU General Public |
7 | * License or the Artistic License, as specified in the README file. |
8 | * |
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9 | */ |
10 | |
11 | /* |
12 | * "Didst thou think that the eyes of the White Tower were blind? Nay, I |
13 | * have seen more than thou knowest, Gray Fool." --Denethor |
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14 | */ |
15 | |
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16 | /* |
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17 | * This file contains various utilities for producing debugging output |
18 | * (mainly related to displaying the stack) |
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19 | */ |
20 | |
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21 | #include "EXTERN.h" |
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22 | #define PERL_IN_DEB_C |
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23 | #include "perl.h" |
24 | |
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25 | #if defined(PERL_IMPLICIT_CONTEXT) |
26 | void |
27 | Perl_deb_nocontext(const char *pat, ...) |
28 | { |
29 | #ifdef DEBUGGING |
30 | dTHX; |
31 | va_list args; |
32 | va_start(args, pat); |
33 | vdeb(pat, &args); |
34 | va_end(args); |
35 | #endif /* DEBUGGING */ |
36 | } |
37 | #endif |
38 | |
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39 | void |
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40 | Perl_deb(pTHX_ const char *pat, ...) |
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41 | { |
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42 | #ifdef DEBUGGING |
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43 | va_list args; |
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44 | va_start(args, pat); |
45 | vdeb(pat, &args); |
46 | va_end(args); |
47 | #endif /* DEBUGGING */ |
48 | } |
49 | |
50 | void |
51 | Perl_vdeb(pTHX_ const char *pat, va_list *args) |
52 | { |
53 | #ifdef DEBUGGING |
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54 | char* file = OutCopFILE(PL_curcop); |
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55 | |
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56 | PerlIO_printf(Perl_debug_log, "(%s:%ld)\t", (file ? file : "<free>"), |
57 | (long)CopLINE(PL_curcop)); |
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58 | (void) PerlIO_vprintf(Perl_debug_log, pat, *args); |
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59 | #endif /* DEBUGGING */ |
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60 | } |
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61 | |
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62 | I32 |
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63 | Perl_debstackptrs(pTHX) |
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64 | { |
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65 | #ifdef DEBUGGING |
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66 | PerlIO_printf(Perl_debug_log, |
67 | "%8"UVxf" %8"UVxf" %8"IVdf" %8"IVdf" %8"IVdf"\n", |
68 | PTR2UV(PL_curstack), PTR2UV(PL_stack_base), |
69 | (IV)*PL_markstack_ptr, (IV)(PL_stack_sp-PL_stack_base), |
70 | (IV)(PL_stack_max-PL_stack_base)); |
71 | PerlIO_printf(Perl_debug_log, |
72 | "%8"UVxf" %8"UVxf" %8"UVuf" %8"UVuf" %8"UVuf"\n", |
73 | PTR2UV(PL_mainstack), PTR2UV(AvARRAY(PL_curstack)), |
74 | PTR2UV(PL_mainstack), PTR2UV(AvFILLp(PL_curstack)), |
75 | PTR2UV(AvMAX(PL_curstack))); |
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76 | #endif /* DEBUGGING */ |
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77 | return 0; |
78 | } |
79 | |
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80 | |
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81 | /* dump the contents of a particular stack |
82 | * Display stack_base[stack_min+1 .. stack_max], |
83 | * and display the marks whose offsets are contained in addresses |
84 | * PL_markstack[mark_min+1 .. mark_max] and whose values are in the range |
85 | * of the stack values being displayed |
86 | * |
87 | * Only displays top 30 max |
88 | */ |
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89 | |
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90 | STATIC void |
91 | S_deb_stack_n(pTHX_ SV** stack_base, I32 stack_min, I32 stack_max, |
92 | I32 mark_min, I32 mark_max) |
93 | { |
94 | #ifdef DEBUGGING |
95 | register I32 i = stack_max - 30; |
96 | I32 *markscan = PL_markstack + mark_min; |
97 | if (i < stack_min) |
98 | i = stack_min; |
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99 | |
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100 | while (++markscan <= PL_markstack + mark_max) |
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101 | if (*markscan >= i) |
102 | break; |
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103 | |
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104 | if (i > stack_min) |
105 | PerlIO_printf(Perl_debug_log, "... "); |
106 | |
107 | if (stack_base[0] != &PL_sv_undef || stack_max < 0) |
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108 | PerlIO_printf(Perl_debug_log, " [STACK UNDERFLOW!!!]\n"); |
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109 | do { |
110 | ++i; |
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111 | if (markscan <= PL_markstack + mark_max && *markscan < i) { |
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112 | do { |
113 | ++markscan; |
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114 | PerlIO_putc(Perl_debug_log, '*'); |
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115 | } |
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116 | while (markscan <= PL_markstack + mark_max && *markscan < i); |
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117 | PerlIO_printf(Perl_debug_log, " "); |
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118 | } |
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119 | if (i > stack_max) |
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120 | break; |
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121 | PerlIO_printf(Perl_debug_log, "%-4s ", SvPEEK(stack_base[i])); |
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122 | } |
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123 | while (1); |
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124 | PerlIO_printf(Perl_debug_log, "\n"); |
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125 | #endif /* DEBUGGING */ |
126 | } |
127 | |
128 | |
129 | /* dump the current stack */ |
130 | |
131 | I32 |
132 | Perl_debstack(pTHX) |
133 | { |
134 | #ifndef SKIP_DEBUGGING |
135 | if (CopSTASH_eq(PL_curcop, PL_debstash) && !DEBUG_J_TEST_) |
136 | return 0; |
137 | |
138 | PerlIO_printf(Perl_debug_log, " => "); |
139 | deb_stack_n(PL_stack_base, |
140 | 0, |
141 | PL_stack_sp - PL_stack_base, |
142 | PL_curstackinfo->si_markoff, |
143 | PL_markstack_ptr - PL_markstack); |
144 | |
145 | |
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146 | #endif /* SKIP_DEBUGGING */ |
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147 | return 0; |
148 | } |
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149 | |
150 | |
151 | #ifdef DEBUGGING |
152 | static char * si_names[] = { |
153 | "UNKNOWN", |
154 | "UNDEF", |
155 | "MAIN", |
156 | "MAGIC", |
157 | "SORT", |
158 | "SIGNAL", |
159 | "OVERLOAD", |
160 | "DESTROY", |
161 | "WARNHOOK", |
162 | "DIEHOOK", |
163 | "REQUIRE" |
164 | }; |
165 | #endif |
166 | |
167 | /* display all stacks */ |
168 | |
169 | |
170 | void |
171 | Perl_deb_stack_all(pTHX) |
172 | { |
173 | #ifdef DEBUGGING |
174 | I32 ix, si_ix; |
175 | PERL_SI *si; |
176 | PERL_CONTEXT *cx; |
177 | |
178 | /* rewind to start of chain */ |
179 | si = PL_curstackinfo; |
180 | while (si->si_prev) |
181 | si = si->si_prev; |
182 | |
183 | si_ix=0; |
184 | for (;;) |
185 | { |
186 | char *si_name; |
187 | int si_name_ix = si->si_type+1; /* -1 is a valid index */ |
188 | if (si_name_ix>= sizeof(si_names)) |
189 | si_name = "????"; |
190 | else |
191 | si_name = si_names[si_name_ix]; |
192 | PerlIO_printf(Perl_debug_log, "STACK %"IVdf": %s\n", |
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193 | (IV)si_ix, si_name); |
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194 | |
195 | for (ix=0; ix<=si->si_cxix; ix++) { |
196 | |
197 | cx = &(si->si_cxstack[ix]); |
198 | PerlIO_printf(Perl_debug_log, |
199 | " CX %"IVdf": %-6s => ", |
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200 | (IV)ix, PL_block_type[CxTYPE(cx)] |
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201 | ); |
202 | /* substitution contexts don't save stack pointers etc) */ |
203 | if (CxTYPE(cx) == CXt_SUBST) |
204 | PerlIO_printf(Perl_debug_log, "\n"); |
205 | else { |
206 | |
207 | /* Find the the current context's stack range by searching |
208 | * forward for any higher contexts using this stack; failing |
209 | * that, it will be equal to the size of the stack for old |
210 | * stacks, or PL_stack_sp for the current stack |
211 | */ |
212 | |
213 | I32 i, stack_min, stack_max, mark_min, mark_max; |
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214 | PERL_CONTEXT *cx_n; |
215 | PERL_SI *si_n; |
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216 | OP *retop; |
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217 | |
218 | cx_n = Null(PERL_CONTEXT*); |
219 | |
220 | /* there's a separate stack per SI, so only search |
221 | * this one */ |
222 | |
223 | for (i=ix+1; i<=si->si_cxix; i++) { |
224 | if (CxTYPE(cx) == CXt_SUBST) |
225 | continue; |
226 | cx_n = &(si->si_cxstack[i]); |
227 | break; |
228 | } |
229 | |
230 | stack_min = cx->blk_oldsp; |
231 | |
232 | if (cx_n) { |
233 | stack_max = cx_n->blk_oldsp; |
234 | } |
235 | else if (si == PL_curstackinfo) { |
236 | stack_max = PL_stack_sp - AvARRAY(si->si_stack); |
237 | } |
238 | else { |
239 | stack_max = AvFILLp(si->si_stack); |
240 | } |
241 | |
242 | /* for the other stack types, there's only one stack |
243 | * shared between all SIs */ |
244 | |
245 | si_n = si; |
246 | i = ix; |
247 | cx_n = Null(PERL_CONTEXT*); |
248 | for (;;) { |
249 | i++; |
250 | if (i > si_n->si_cxix) { |
251 | if (si_n == PL_curstackinfo) |
252 | break; |
253 | else { |
254 | si_n = si_n->si_next; |
255 | i = 0; |
256 | } |
257 | } |
258 | if (CxTYPE(&(si_n->si_cxstack[i])) == CXt_SUBST) |
259 | continue; |
260 | cx_n = &(si_n->si_cxstack[i]); |
261 | break; |
262 | } |
263 | |
264 | mark_min = cx->blk_oldmarksp; |
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265 | if (cx_n) { |
266 | mark_max = cx_n->blk_oldmarksp; |
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267 | } |
268 | else { |
269 | mark_max = PL_markstack_ptr - PL_markstack; |
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270 | } |
271 | |
272 | deb_stack_n(AvARRAY(si->si_stack), |
273 | stack_min, stack_max, mark_min, mark_max); |
274 | |
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275 | if (CxTYPE(cx) == CXt_EVAL || CxTYPE(cx) == CXt_SUB |
276 | || CxTYPE(cx) == CXt_FORMAT) |
277 | { |
278 | retop = (CxTYPE(cx) == CXt_EVAL) |
279 | ? cx->blk_eval.retop : cx->blk_sub.retop; |
280 | |
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281 | PerlIO_printf(Perl_debug_log, " retop=%s\n", |
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282 | retop ? OP_NAME(retop) : "(null)" |
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283 | ); |
284 | } |
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285 | } |
286 | } /* next context */ |
287 | |
288 | |
289 | if (si == PL_curstackinfo) |
290 | break; |
291 | si = si->si_next; |
292 | si_ix++; |
293 | if (!si) |
294 | break; /* shouldn't happen, but just in case.. */ |
295 | } /* next stackinfo */ |
296 | |
297 | PerlIO_printf(Perl_debug_log, "\n"); |
298 | #endif /* DEBUGGING */ |
299 | } |
300 | |
301 | |