This is a live mirror of the Perl 5 development currently hosted at https://github.com/perl/perl5
improve -Dl debugging output
authorDavid Mitchell <davem@iabyn.com>
Tue, 30 Mar 2010 19:26:31 +0000 (20:26 +0100)
committerDavid Mitchell <davem@iabyn.com>
Tue, 30 Mar 2010 20:06:36 +0000 (21:06 +0100)
In particular, distinguish between scope and context stack push/pops,
show depth of JUMPENV stack, and show STACKINFO push/pops

cop.h
perl.h
pp_ctl.c
scope.c

diff --git a/cop.h b/cop.h
index 13ce794..2d0a459 100644 (file)
--- a/cop.h
+++ b/cop.h
  */
 
 /* A jmpenv packages the state required to perform a proper non-local jump.
- * Note that there is a start_env initialized when perl starts, and top_env
- * points to this initially, so top_env should always be non-null.
+ * Note that there is a PL_start_env initialized when perl starts, and
+ * PL_top_env points to this initially, so PL_top_env should always be
+ * non-null.
  *
- * Existence of a non-null top_env->je_prev implies it is valid to call
- * longjmp() at that runlevel (we make sure start_env.je_prev is always
+ * Existence of a non-null PL_top_env->je_prev implies it is valid to call
+ * longjmp() at that runlevel (we make sure PL_start_env.je_prev is always
  * null to ensure this).
  *
  * je_mustcatch, when set at any runlevel to TRUE, means eval ops must
@@ -99,9 +100,12 @@ typedef struct jmpenv JMPENV;
 
 #define JMPENV_PUSH(v) \
     STMT_START {                                                       \
-       DEBUG_l(Perl_deb(aTHX_ "Setting up jumplevel %p, was %p at %s:%d\n",    \
-                        (void*)&cur_env, (void*)PL_top_env,                    \
-                        __FILE__, __LINE__));                                  \
+       DEBUG_l({                                                       \
+           int i = 0; JMPENV *p = PL_top_env;                          \
+           while (p) { i++; p = p->je_prev; }                          \
+           Perl_deb(aTHX_ "push JUMPLEVEL %d (now %p, was %p) at %s:%d\n",\
+                        i, (void*)&cur_env, (void*)PL_top_env,         \
+                        __FILE__, __LINE__);})                         \
        cur_env.je_prev = PL_top_env;                                   \
        OP_REG_TO_MEM;                                                  \
        cur_env.je_ret = PerlProc_setjmp(cur_env.je_buf, SCOPE_SAVES_SIGNAL_MASK);              \
@@ -113,15 +117,24 @@ typedef struct jmpenv JMPENV;
 
 #define JMPENV_POP \
     STMT_START {                                                       \
-       DEBUG_l(Perl_deb(aTHX_ "popping jumplevel was %p, now %p at %s:%d\n",   \
-                        (void*)PL_top_env, (void*)cur_env.je_prev,             \
-                        __FILE__, __LINE__));                                  \
+       DEBUG_l({                                                       \
+           int i = -1; JMPENV *p = PL_top_env;                         \
+           while (p) { i++; p = p->je_prev; }                          \
+           Perl_deb(aTHX_ "pop  JUMPLEVEL %d (now %p, was %p) at %s:%d\n",\
+                        i, (void*)cur_env.je_prev, (void*)PL_top_env,  \
+                        __FILE__, __LINE__);})                         \
        assert(PL_top_env == &cur_env);                                 \
        PL_top_env = cur_env.je_prev;                                   \
     } STMT_END
 
 #define JMPENV_JUMP(v) \
     STMT_START {                                               \
+       DEBUG_l({                                               \
+           int i = -1; JMPENV *p = PL_top_env;                 \
+           while (p) { i++; p = p->je_prev; }                  \
+           Perl_deb(aTHX_ "JUMP JUMPLEVEL %d (%p) at %s:%d\n", \
+                        i, (void*)PL_top_env,                  \
+                        __FILE__, __LINE__);})                 \
        OP_REG_TO_MEM;                                          \
        if (PL_top_env->je_prev)                                \
            PerlProc_longjmp(PL_top_env->je_buf, (v));          \
@@ -132,7 +145,15 @@ typedef struct jmpenv JMPENV;
     } STMT_END
 
 #define CATCH_GET              (PL_top_env->je_mustcatch)
-#define CATCH_SET(v)           (PL_top_env->je_mustcatch = (v))
+#define CATCH_SET(v) \
+    STMT_START {                                                       \
+       DEBUG_l(                                                        \
+           Perl_deb(aTHX_                                              \
+               "JUMPLEVEL set catch %d => %d (for %p) at %s:%d\n",     \
+                PL_top_env->je_mustcatch, v, (void*)PL_top_env,        \
+                __FILE__, __LINE__);)                                  \
+       PL_top_env->je_mustcatch = (v);                                 \
+    } STMT_END
 
 
 #include "mydtrace.h"
@@ -550,6 +571,16 @@ struct block {
 #define blk_loop       cx_u.cx_blk.blk_u.blku_loop
 #define blk_givwhen    cx_u.cx_blk.blk_u.blku_givwhen
 
+#define DEBUG_CX(action)                                               \
+    DEBUG_l(WITH_THX(                                                  \
+       Perl_deb(aTHX_ "CX %ld %s %s (scope %ld,%ld) at %s:%d\n",       \
+                   (long)cxstack_ix,                                   \
+                   action,                                             \
+                   PL_block_type[CxTYPE(&cxstack[cxstack_ix])],        \
+                   (long)PL_scopestack_ix,                             \
+                   (long)(cxstack[cxstack_ix].blk_oldscopesp),         \
+                   __FILE__, __LINE__)));
+
 /* Enter a block. */
 #define PUSHBLOCK(cx,t,sp) CXINC, cx = &cxstack[cxstack_ix],           \
        cx->cx_type             = t,                                    \
@@ -559,28 +590,27 @@ struct block {
        cx->blk_oldscopesp      = PL_scopestack_ix,                     \
        cx->blk_oldpm           = PL_curpm,                             \
        cx->blk_gimme           = (U8)gimme;                            \
-       DEBUG_l( PerlIO_printf(Perl_debug_log, "Entering block %ld, type %s\n", \
-                   (long)cxstack_ix, PL_block_type[CxTYPE(cx)]); )
+       DEBUG_CX("PUSH");
 
 /* Exit a block (RETURN and LAST). */
-#define POPBLOCK(cx,pm) cx = &cxstack[cxstack_ix--],                   \
+#define POPBLOCK(cx,pm)                                                        \
+       DEBUG_CX("POP");                                                \
+       cx = &cxstack[cxstack_ix--],                                    \
        newsp            = PL_stack_base + cx->blk_oldsp,               \
        PL_curcop        = cx->blk_oldcop,                              \
        PL_markstack_ptr = PL_markstack + cx->blk_oldmarksp,            \
        PL_scopestack_ix = cx->blk_oldscopesp,                          \
        pm               = cx->blk_oldpm,                               \
-       gimme            = cx->blk_gimme;                               \
-       DEBUG_SCOPE("POPBLOCK");                                        \
-       DEBUG_l( PerlIO_printf(Perl_debug_log, "Leaving block %ld, type %s\n",          \
-                   (long)cxstack_ix+1,PL_block_type[CxTYPE(cx)]); )
+       gimme            = cx->blk_gimme;
 
 /* Continue a block elsewhere (NEXT and REDO). */
-#define TOPBLOCK(cx) cx  = &cxstack[cxstack_ix],                       \
+#define TOPBLOCK(cx)                                                   \
+       DEBUG_CX("TOP");                                                \
+       cx  = &cxstack[cxstack_ix],                                     \
        PL_stack_sp      = PL_stack_base + cx->blk_oldsp,               \
        PL_markstack_ptr = PL_markstack + cx->blk_oldmarksp,            \
        PL_scopestack_ix = cx->blk_oldscopesp,                          \
-       PL_curpm         = cx->blk_oldpm;                               \
-       DEBUG_SCOPE("TOPBLOCK");
+       PL_curpm         = cx->blk_oldpm;
 
 /* substitution context */
 struct subst {
@@ -809,6 +839,11 @@ typedef struct stackinfo PERL_SI;
 #define PUSHSTACKi(type) \
     STMT_START {                                                       \
        PERL_SI *next = PL_curstackinfo->si_next;                       \
+       DEBUG_l({                                                       \
+           int i = 0; PERL_SI *p = PL_curstackinfo;                    \
+           while (p) { i++; p = p->si_prev; }                          \
+           Perl_deb(aTHX_ "push STACKINFO %d at %s:%d\n",              \
+                        i, __FILE__, __LINE__);})                      \
        if (!next) {                                                    \
            next = new_stackinfo(32, 2048/sizeof(PERL_CONTEXT) - 1);    \
            next->si_prev = PL_curstackinfo;                            \
@@ -830,6 +865,11 @@ typedef struct stackinfo PERL_SI;
     STMT_START {                                                       \
        dSP;                                                            \
        PERL_SI * const prev = PL_curstackinfo->si_prev;                \
+       DEBUG_l({                                                       \
+           int i = -1; PERL_SI *p = PL_curstackinfo;                   \
+           while (p) { i++; p = p->si_prev; }                          \
+           Perl_deb(aTHX_ "pop  STACKINFO %d at %s:%d\n",              \
+                        i, __FILE__, __LINE__);})                      \
        if (!prev) {                                                    \
            PerlIO_printf(Perl_error_log, "panic: POPSTACK\n");         \
            my_exit(1);                                                 \
diff --git a/perl.h b/perl.h
index 5988e78..960ba1a 100644 (file)
--- a/perl.h
+++ b/perl.h
@@ -3818,8 +3818,10 @@ Gid_t getegid (void);
 
 
 #define DEBUG_SCOPE(where) \
-    DEBUG_l(WITH_THR(Perl_deb(aTHX_ "%s scope %ld at %s:%d\n", \
-                   where, (long)PL_scopestack_ix, __FILE__, __LINE__)));
+    DEBUG_l(WITH_THR( \
+    Perl_deb(aTHX_ "%s scope %ld (savestack=%ld) at %s:%d\n",  \
+                   where, (long)PL_scopestack_ix, (long)PL_savestack_ix, \
+                   __FILE__, __LINE__)));
 
 
 
index a35cd43..80c7b22 100644 (file)
--- a/pp_ctl.c
+++ b/pp_ctl.c
@@ -1339,11 +1339,11 @@ S_dopoptolabel(pTHX_ const char *label)
          {
            const char *cx_label = CxLABEL(cx);
            if (!cx_label || strNE(label, cx_label) ) {
-               DEBUG_l(Perl_deb(aTHX_ "(Skipping label #%ld %s)\n",
+               DEBUG_l(Perl_deb(aTHX_ "(poptolabel(): skipping label at cx=%ld %s)\n",
                        (long)i, cx_label));
                continue;
            }
-           DEBUG_l( Perl_deb(aTHX_ "(Found label #%ld %s)\n", (long)i, label));
+           DEBUG_l( Perl_deb(aTHX_ "(poptolabel(): found label at cx=%ld %s)\n", (long)i, label));
            return i;
          }
        }
@@ -1412,7 +1412,7 @@ S_dopoptosub_at(pTHX_ const PERL_CONTEXT *cxstk, I32 startingblock)
        case CXt_EVAL:
        case CXt_SUB:
        case CXt_FORMAT:
-           DEBUG_l( Perl_deb(aTHX_ "(Found sub #%ld)\n", (long)i));
+           DEBUG_l( Perl_deb(aTHX_ "(dopoptosub_at(): found sub at cx=%ld)\n", (long)i));
            return i;
        }
     }
@@ -1430,7 +1430,7 @@ S_dopoptoeval(pTHX_ I32 startingblock)
        default:
            continue;
        case CXt_EVAL:
-           DEBUG_l( Perl_deb(aTHX_ "(Found eval #%ld)\n", (long)i));
+           DEBUG_l( Perl_deb(aTHX_ "(dopoptoeval(): found eval at cx=%ld)\n", (long)i));
            return i;
        }
     }
@@ -1459,7 +1459,7 @@ S_dopoptoloop(pTHX_ I32 startingblock)
        case CXt_LOOP_LAZYSV:
        case CXt_LOOP_FOR:
        case CXt_LOOP_PLAIN:
-           DEBUG_l( Perl_deb(aTHX_ "(Found loop #%ld)\n", (long)i));
+           DEBUG_l( Perl_deb(aTHX_ "(dopoptoloop(): found loop at cx=%ld)\n", (long)i));
            return i;
        }
     }
@@ -1477,7 +1477,7 @@ S_dopoptogiven(pTHX_ I32 startingblock)
        default:
            continue;
        case CXt_GIVEN:
-           DEBUG_l( Perl_deb(aTHX_ "(Found given #%ld)\n", (long)i));
+           DEBUG_l( Perl_deb(aTHX_ "(dopoptogiven(): found given at cx=%ld)\n", (long)i));
            return i;
        case CXt_LOOP_PLAIN:
            assert(!CxFOREACHDEF(cx));
@@ -1486,7 +1486,7 @@ S_dopoptogiven(pTHX_ I32 startingblock)
        case CXt_LOOP_LAZYSV:
        case CXt_LOOP_FOR:
            if (CxFOREACHDEF(cx)) {
-               DEBUG_l( Perl_deb(aTHX_ "(Found foreach #%ld)\n", (long)i));
+               DEBUG_l( Perl_deb(aTHX_ "(dopoptogiven(): found foreach at cx=%ld)\n", (long)i));
                return i;
            }
        }
@@ -1505,7 +1505,7 @@ S_dopoptowhen(pTHX_ I32 startingblock)
        default:
            continue;
        case CXt_WHEN:
-           DEBUG_l( Perl_deb(aTHX_ "(Found when #%ld)\n", (long)i));
+           DEBUG_l( Perl_deb(aTHX_ "(dopoptowhen(): found when at cx=%ld)\n", (long)i));
            return i;
        }
     }
@@ -1521,8 +1521,7 @@ Perl_dounwind(pTHX_ I32 cxix)
     while (cxstack_ix > cxix) {
        SV *sv;
         register PERL_CONTEXT *cx = &cxstack[cxstack_ix];
-       DEBUG_l(PerlIO_printf(Perl_debug_log, "Unwinding block %ld, type %s\n",
-                             (long) cxstack_ix, PL_block_type[CxTYPE(cx)]));
+       DEBUG_CX("UNWIND");                                             \
        /* Note: we don't need to restore the base context info till the end. */
        switch (CxTYPE(cx)) {
        case CXt_SUBST:
diff --git a/scope.c b/scope.c
index ed4c835..414f5b5 100644 (file)
--- a/scope.c
+++ b/scope.c
@@ -694,6 +694,8 @@ Perl_leave_scope(pTHX_ I32 base)
 
     if (base < -1)
        Perl_croak(aTHX_ "panic: corrupt saved stack index");
+    DEBUG_l(Perl_deb(aTHX_ "savestack: releasing items %ld -> %ld\n",
+                       (long)PL_savestack_ix, (long)base));
     while (PL_savestack_ix > base) {
        TAINT_NOT;