19990502 sourceware importbinu_ss_19990502

1 files changed, 269 insertions, 0 deletions

diff --git a/gprof/symtab.c b/gprof/symtab.c
new file mode 100644
index 0000000..182c657
--- /dev/null
+++ b/gprof/symtab.c
@@ -0,0 +1,269 @@
+#include "gprof.h"
+#include "cg_arcs.h"
+#include "corefile.h"
+#include "symtab.h"
+
+Sym_Table symtab;
+
+
+/*
+ * Initialize a symbol (so it's empty).
+ */
+void
+DEFUN (sym_init, (sym), Sym * sym)
+{
+  memset (sym, 0, sizeof (*sym));
+  /*
+   * It is not safe to assume that a binary zero corresponds to
+   * a floating-point 0.0, so initialize floats explicitly:
+   */
+  sym->hist.time = 0.0;
+  sym->cg.child_time = 0.0;
+  sym->cg.prop.fract = 0.0;
+  sym->cg.prop.self = 0.0;
+  sym->cg.prop.child = 0.0;
+}
+
+
+/*
+ * Compare the function entry-point of two symbols and return <0, =0,
+ * or >0 depending on whether the left value is smaller than, equal
+ * to, or greater than the right value.  If two symbols are equal
+ * but one has is_func set and the other doesn't, we make the
+ * non-function symbol one "bigger" so that the function symbol will
+ * survive duplicate removal.  Finally, if both symbols have the
+ * same is_func value, we discriminate against is_static such that
+ * the global symbol survives.
+ */
+static int
+DEFUN (cmp_addr, (lp, rp), const PTR lp AND const PTR rp)
+{
+  Sym *left = (Sym *) lp;
+  Sym *right = (Sym *) rp;
+
+  if (left->addr > right->addr)
+    {
+      return 1;
+    }
+  else if (left->addr < right->addr)
+    {
+      return -1;
+    }
+
+  if (left->is_func != right->is_func)
+    {
+      return right->is_func - left->is_func;
+    }
+
+  return left->is_static - right->is_static;
+}
+
+
+void
+DEFUN (symtab_finalize, (tab), Sym_Table * tab)
+{
+  Sym *src, *dst;
+  bfd_vma prev_addr;
+
+  if (!tab->len)
+    {
+      return;
+    }
+
+  /*
+   * Sort symbol table in order of increasing function addresses:
+   */
+  qsort (tab->base, tab->len, sizeof (Sym), cmp_addr);
+
+  /*
+   * Remove duplicate entries to speed-up later processing and
+   * set end_addr if its not set yet:
+   */
+  prev_addr = tab->base[0].addr + 1;
+  for (src = dst = tab->base; src < tab->limit; ++src)
+    {
+      if (src->addr == prev_addr)
+	{
+	  /*
+	   * If same address, favor global symbol over static one,
+	   * then function over line number.  If both symbols are
+	   * either static or global and either function or line, check
+	   * whether one has name beginning with underscore while
+	   * the other doesn't.  In such cases, keep sym without
+	   * underscore.  This takes cares of compiler generated
+	   * symbols (such as __gnu_compiled, __c89_used, etc.).
+	   */
+	  if ((!src->is_static && dst[-1].is_static)
+	      || ((src->is_static == dst[-1].is_static)
+		  && ((src->is_func && !dst[-1].is_func)
+		      || ((src->is_func == dst[-1].is_func)
+			  && ((src->name[0] != '_' && dst[-1].name[0] == '_')
+			      || (src->name[0]
+				  && src->name[1] != '_'
+				  && dst[-1].name[1] == '_'))))))
+	    {
+	      DBG (AOUTDEBUG | IDDEBUG,
+		   printf ("[symtab_finalize] favor %s@%c%c over %s@%c%c",
+			   src->name, src->is_static ? 't' : 'T',
+			   src->is_func ? 'F' : 'f',
+			   dst[-1].name, dst[-1].is_static ? 't' : 'T',
+			   dst[-1].is_func ? 'F' : 'f');
+		   printf (" (addr=%lx)\n", src->addr));
+	      dst[-1] = *src;
+	    }
+	  else
+	    {
+	      DBG (AOUTDEBUG | IDDEBUG,
+		   printf ("[symtab_finalize] favor %s@%c%c over %s@%c%c",
+			   dst[-1].name, dst[-1].is_static ? 't' : 'T',
+			   dst[-1].is_func ? 'F' : 'f',
+			   src->name, src->is_static ? 't' : 'T',
+			   src->is_func ? 'F' : 'f');
+		   printf (" (addr=%lx)\n", src->addr));
+	    }
+	}
+      else
+	{
+	  if (dst > tab->base && dst[-1].end_addr == 0)
+	    {
+	      dst[-1].end_addr = src->addr - 1;
+	    }
+
+	  /* retain sym only if it has a non-empty address range: */
+	  if (!src->end_addr || src->addr <= src->end_addr)
+	    {
+	      *dst++ = *src;
+	      prev_addr = src->addr;
+	    }
+	}
+    }
+  if (tab->len > 0 && dst[-1].end_addr == 0)
+    {
+      dst[-1].end_addr = core_text_sect->vma + core_text_sect->_raw_size - 1;
+    }
+
+  DBG (AOUTDEBUG | IDDEBUG,
+       printf ("[symtab_finalize]: removed %d duplicate entries\n",
+	       tab->len - (int) (dst - tab->base)));
+
+  tab->limit = dst;
+  tab->len = tab->limit - tab->base;
+
+  DBG (AOUTDEBUG | IDDEBUG,
+       unsigned int j;
+
+       for (j = 0; j < tab->len; ++j)
+       {
+       printf ("[symtab_finalize] 0x%lx-0x%lx\t%s\n",
+	       (long) tab->base[j].addr, (long) tab->base[j].end_addr,
+	       tab->base[j].name);
+       }
+  );
+}
+
+
+#ifdef DEBUG
+
+Sym *
+DEFUN (dbg_sym_lookup, (symtab, address), Sym_Table * symtab AND bfd_vma address)
+{
+  long low, mid, high;
+  Sym *sym;
+
+  fprintf (stderr, "[dbg_sym_lookup] address 0x%lx\n", address);
+
+  sym = symtab->base;
+  for (low = 0, high = symtab->len - 1; low != high;)
+    {
+      mid = (high + low) >> 1;
+      fprintf (stderr, "[dbg_sym_lookup] low=0x%lx, mid=0x%lx, high=0x%lx\n",
+	       low, mid, high);
+      fprintf (stderr, "[dbg_sym_lookup] sym[m]=0x%lx sym[m + 1]=0x%lx\n",
+	       sym[mid].addr, sym[mid + 1].addr);
+      if (sym[mid].addr <= address && sym[mid + 1].addr > address)
+	{
+	  return &sym[mid];
+	}
+      if (sym[mid].addr > address)
+	{
+	  high = mid;
+	}
+      else
+	{
+	  low = mid + 1;
+	}
+    }
+  fprintf (stderr, "[dbg_sym_lookup] binary search fails???\n");
+  return 0;
+}
+
+#endif	/* DEBUG */
+
+
+/*
+ * Look up an address in the symbol-table that is sorted by address.
+ * If address does not hit any symbol, 0 is returned.
+ */
+Sym *
+DEFUN (sym_lookup, (symtab, address), Sym_Table * symtab AND bfd_vma address)
+{
+  long low, high;
+  long mid = -1;
+  Sym *sym;
+#ifdef DEBUG
+  int probes = 0;
+#endif /* DEBUG */
+
+  if (!symtab->len)
+    {
+      return 0;
+    }
+
+  sym = symtab->base;
+  for (low = 0, high = symtab->len - 1; low != high;)
+    {
+      DBG (LOOKUPDEBUG, ++probes);
+      mid = (high + low) / 2;
+      if (sym[mid].addr <= address && sym[mid + 1].addr > address)
+	{
+	  if (address > sym[mid].end_addr)
+	    {
+	      /*
+	       * Address falls into gap between sym[mid] and
+	       * sym[mid + 1]:
+	       */
+	      return 0;
+	    }
+	  else
+	    {
+	      DBG (LOOKUPDEBUG,
+		   printf ("[sym_lookup] %d probes (symtab->len=%u)\n",
+			   probes, symtab->len - 1));
+	      return &sym[mid];
+	    }
+	}
+      if (sym[mid].addr > address)
+	{
+	  high = mid;
+	}
+      else
+	{
+	  low = mid + 1;
+	}
+    }
+  if (sym[mid + 1].addr <= address)
+    {
+      if (address > sym[mid + 1].end_addr)
+	{
+	  /* address is beyond end of sym[mid + 1]: */
+	  return 0;
+	}
+      else
+	{
+	  DBG (LOOKUPDEBUG, printf ("[sym_lookup] %d (%u) probes, fall off\n",
+				    probes, symtab->len - 1));
+	  return &sym[mid + 1];
+	}
+    }
+  return 0;
+}