2000-12-07 Andrew Haley <aph@redhat.com>

        * readelf.c (display_debug_frames): Only display columns that are
        referenced by the frame debug info.

diff --git a/binutils/ChangeLog b/binutils/ChangeLog
index 6262287..7449b84 100644 (file)
--- a/binutils/ChangeLog
+++ b/binutils/ChangeLog
@@ -1,3 +1,8 @@
+2000-12-07  Andrew Haley  <aph@redhat.com>
+
+       * readelf.c (display_debug_frames): Only display columns that are
+       referenced by the frame debug info.
+
 2000-12-05  Nick Clifton  <nickc@redhat.com>
 
        * MAINTAINERS: Add Jason Merrill as DWARF2 maintainer.

diff --git a/binutils/readelf.c b/binutils/readelf.c
index b173a2b..42e707d 100644 (file)
--- a/binutils/readelf.c
+++ b/binutils/readelf.c
@@ -6501,8 +6501,8 @@ typedef struct Frame_Chunk
   struct Frame_Chunk *next;
   unsigned char *chunk_start;
   int ncols;
-  /* DW_CFA_{undefined,same_value,offset,register}  */
-  unsigned char *col_type;
+  /* DW_CFA_{undefined,same_value,offset,register,unreferenced}  */
+  short int *col_type;
   int *col_offset;
   char *augmentation;
   unsigned int code_factor;
@@ -6515,6 +6515,10 @@ typedef struct Frame_Chunk
 }
 Frame_Chunk;
 
+/* A marker for a col_type that means this column was never referenced
+   in the frame info.  */
+#define DW_CFA_unreferenced (-1)
+
 static void
 frame_need_space (fc, reg)
      Frame_Chunk *fc;
@@ -6525,14 +6529,14 @@ frame_need_space (fc, reg)
   if (reg < fc->ncols)
     return;
   fc->ncols = reg + 1;
-  fc->col_type = (unsigned char *) xrealloc (fc->col_type,
-                                            fc->ncols * sizeof (unsigned char));
+  fc->col_type = (short int *) xrealloc (fc->col_type,
+                                        fc->ncols * sizeof (short int));
   fc->col_offset = (int *) xrealloc (fc->col_offset,
                                     fc->ncols * sizeof (int));
 
   while (prev < fc->ncols)
     {
-      fc->col_type[prev] = DW_CFA_undefined;
+      fc->col_type[prev] = DW_CFA_unreferenced;
       fc->col_offset[prev] = 0;
       prev++;
     }
@@ -6554,10 +6558,13 @@ frame_display_row (fc, need_col_headers, max_regs)
       *need_col_headers = 0;
       printf ("   LOC   CFA      ");
       for (r=0; r<*max_regs; r++)
-       if (r == fc->ra)
-         printf ("ra   ");
-       else
-         printf ("r%-4d", r);
+       if (fc->col_type[r] != DW_CFA_unreferenced)
+         {
+           if (r == fc->ra)
+             printf ("ra   ");
+           else
+             printf ("r%-4d", r);
+         }
       printf ("\n");
     }
   printf ("%08x ", (unsigned int) fc->pc_begin);
@@ -6565,25 +6572,28 @@ frame_display_row (fc, need_col_headers, max_regs)
   printf ("%-8s ", tmp);
   for (r=0; r<fc->ncols; r++)
     {
-      switch (fc->col_type[r])
+      if (fc->col_type[r] != DW_CFA_unreferenced)
        {
-       case DW_CFA_undefined:
-         strcpy (tmp, "u");
-         break;
-       case DW_CFA_same_value:
-         strcpy (tmp, "s");
-         break;
-       case DW_CFA_offset:
-         sprintf (tmp, "c%+d", fc->col_offset[r]);
-         break;
-       case DW_CFA_register:
-         sprintf (tmp, "r%d", fc->col_offset[r]);
-         break;
-       default:
-         strcpy (tmp, "n/a");
-         break;
+         switch (fc->col_type[r])
+           {
+           case DW_CFA_undefined:
+             strcpy (tmp, "u");
+             break;
+           case DW_CFA_same_value:
+             strcpy (tmp, "s");
+             break;
+           case DW_CFA_offset:
+             sprintf (tmp, "c%+d", fc->col_offset[r]);
+             break;
+           case DW_CFA_register:
+             sprintf (tmp, "r%d", fc->col_offset[r]);
+             break;
+           default:
+             strcpy (tmp, "n/a");
+             break;
+           }
+         printf ("%-5s", tmp);
        }
-      printf ("%-5s", tmp);
     }
   printf ("\n");
 }
@@ -6635,7 +6645,7 @@ display_debug_frames (section, start, file)
          chunks = fc;
          fc->chunk_start = saved_start;
          fc->ncols = 0;
-         fc->col_type = (unsigned char *) xmalloc (sizeof (unsigned char));
+         fc->col_type = (short int *) xmalloc (sizeof (short int));
          fc->col_offset = (int *) xmalloc (sizeof (int));
          frame_need_space (fc, max_regs-1);
 
@@ -6689,7 +6699,7 @@ display_debug_frames (section, start, file)
              warn ("Invalid CIE pointer %08x in FDE at %08x\n", cie_id, saved_start);
              start = block_end;
              fc->ncols = 0;
-             fc->col_type = (unsigned char *) xmalloc (sizeof (unsigned char));
+             fc->col_type = (short int *) xmalloc (sizeof (short int));
              fc->col_offset = (int *) xmalloc (sizeof (int));
              frame_need_space (fc, max_regs-1);
              cie = fc;
@@ -6698,9 +6708,9 @@ display_debug_frames (section, start, file)
          else
            {
              fc->ncols = cie->ncols;
-             fc->col_type = (unsigned char *) xmalloc (fc->ncols * sizeof (unsigned char));
+             fc->col_type = (short int *) xmalloc (fc->ncols * sizeof (short int));
              fc->col_offset = (int *) xmalloc (fc->ncols * sizeof (int));
-             memcpy (fc->col_type, cie->col_type, fc->ncols);
+             memcpy (fc->col_type, cie->col_type, fc->ncols * sizeof (short int));
              memcpy (fc->col_offset, cie->col_offset, fc->ncols * sizeof (int));
              fc->augmentation = cie->augmentation;
              fc->code_factor = cie->code_factor;
@@ -6728,6 +6738,107 @@ display_debug_frames (section, start, file)
       /* This exists for readelf maintainers.  */
 #define FDEBUG 0
 
+      {
+       /* Start by making a pass over the chunk, allocating storage
+           and taking note of what registers are used.  */
+
+       unsigned char *tmp = start;
+       while (start < block_end)
+         {
+           unsigned op, opa;
+           unsigned long reg;
+           bfd_vma vma;
+           
+           op = *start++;
+           opa = op & 0x3f;
+           if (op & 0xc0)
+             op &= 0xc0;
+           
+           /* Warning: if you add any more cases to this switch, be
+              sure to add them to the corresponding switch below.  */
+           switch (op)
+             {
+             case DW_CFA_advance_loc:
+               break;
+             case DW_CFA_offset:
+               LEB ();
+               frame_need_space (fc, opa);
+               fc->col_type[opa] = DW_CFA_undefined;
+               break;
+             case DW_CFA_restore:
+               frame_need_space (fc, opa);
+               fc->col_type[opa] = DW_CFA_undefined;
+               break;
+             case DW_CFA_set_loc:
+               start += sizeof (vma);
+               break;
+             case DW_CFA_advance_loc1:
+               start += 1;
+               break;
+             case DW_CFA_advance_loc2:
+               start += 2;
+               break;
+             case DW_CFA_advance_loc4:
+               start += 4;
+               break;
+             case DW_CFA_offset_extended:
+               reg = LEB (); LEB ();
+               frame_need_space (fc, reg);
+               fc->col_type[reg] = DW_CFA_undefined;
+               break;
+             case DW_CFA_restore_extended:
+               reg = LEB ();
+               frame_need_space (fc, reg);
+               fc->col_type[reg] = DW_CFA_undefined;
+               break;
+             case DW_CFA_undefined:
+               reg = LEB ();
+               frame_need_space (fc, reg);
+               fc->col_type[reg] = DW_CFA_undefined;
+               break;
+             case DW_CFA_same_value:
+               reg = LEB ();
+               frame_need_space (fc, reg);
+               fc->col_type[reg] = DW_CFA_undefined;
+               break;
+             case DW_CFA_register:
+               reg = LEB (); LEB ();
+               frame_need_space (fc, reg);
+               fc->col_type[reg] = DW_CFA_undefined;
+               break;
+             case DW_CFA_def_cfa:
+               LEB (); LEB ();
+               break;
+             case DW_CFA_def_cfa_register:
+               LEB ();
+               break;
+             case DW_CFA_def_cfa_offset:
+               LEB ();
+               break;
+#ifndef DW_CFA_GNU_args_size
+#define DW_CFA_GNU_args_size 0x2e
+#endif
+             case DW_CFA_GNU_args_size:
+               LEB ();
+               break;          
+#ifndef DW_CFA_GNU_negative_offset_extended
+#define DW_CFA_GNU_negative_offset_extended 0x2f
+#endif
+             case DW_CFA_GNU_negative_offset_extended:
+               reg = LEB (); LEB ();      
+               frame_need_space (fc, reg);
+               fc->col_type[reg] = DW_CFA_undefined;
+               
+             default:
+               break;
+             }
+         }
+       start = tmp;
+      }
+
+      /* Now we know what registers are used, make a second pass over
+         the chunk, this time actually printing out the info.  */
+
       while (start < block_end)
        {
          unsigned op, opa;
@@ -6740,6 +6851,8 @@ display_debug_frames (section, start, file)
          if (op & 0xc0)
            op &= 0xc0;
 
+           /* Warning: if you add any more cases to this switch, be
+              sure to add them to the corresponding switch above.  */
          switch (op)
            {
            case DW_CFA_advance_loc:
@@ -6752,7 +6865,6 @@ display_debug_frames (section, start, file)
              break;
 
            case DW_CFA_offset:
-             frame_need_space (fc, opa);
              roffs = LEB ();
 #if FDEBUG
              printf ("  DW_CFA_offset: r%d = cfa[%d*%d]\n", opa, roffs, fc->data_factor);
@@ -6762,7 +6874,6 @@ display_debug_frames (section, start, file)
              break;
 
            case DW_CFA_restore:
-             frame_need_space (fc, opa);
 #if FDEBUG
              printf ("  DW_CFA_restore: r%d\n", opa);
 #endif
@@ -6812,7 +6923,6 @@ display_debug_frames (section, start, file)
            case DW_CFA_offset_extended:
              reg = LEB ();
              roffs = LEB ();
-             frame_need_space (fc, reg);
 #if FDEBUG
              printf ("  DW_CFA_offset_extended: r%d = cfa[%d*%d]\n", reg, roffs, fc->data_factor);
 #endif
@@ -6822,7 +6932,6 @@ display_debug_frames (section, start, file)
 
            case DW_CFA_restore_extended:
              reg = LEB ();
-             frame_need_space (fc, reg);
 #if FDEBUG
              printf ("  DW_CFA_restore_extended: r%d\n", reg);
 #endif
@@ -6832,7 +6941,6 @@ display_debug_frames (section, start, file)
 
            case DW_CFA_undefined:
              reg = LEB ();
-             frame_need_space (fc, reg);
 #if FDEBUG
              printf ("  DW_CFA_undefined: r%d\n", reg);
 #endif
@@ -6842,7 +6950,6 @@ display_debug_frames (section, start, file)
 
            case DW_CFA_same_value:
              reg = LEB ();
-             frame_need_space (fc, reg);
 #if FDEBUG
              printf ("  DW_CFA_same_value: r%d\n", reg);
 #endif
@@ -6853,9 +6960,8 @@ display_debug_frames (section, start, file)
            case DW_CFA_register:
              reg = LEB ();
              roffs = LEB ();
-             frame_need_space (fc, reg);
 #if FDEBUG
-             printf ("  DW_CFA_ame_value: r%d\n", reg);
+             printf ("  DW_CFA_register: r%d\n", reg);
 #endif
              fc->col_type[reg] = DW_CFA_register;
              fc->col_offset[reg] = roffs;
@@ -6867,7 +6973,7 @@ display_debug_frames (section, start, file)
 #endif
              rs = (Frame_Chunk *) xmalloc (sizeof (Frame_Chunk));
              rs->ncols = fc->ncols;
-             rs->col_type = (unsigned char *) xmalloc (rs->ncols);
+             rs->col_type = (short int *) xmalloc (rs->ncols * sizeof (short int));
              rs->col_offset = (int *) xmalloc (rs->ncols * sizeof (int));
              memcpy (rs->col_type, fc->col_type, rs->ncols);
              memcpy (rs->col_offset, fc->col_offset, rs->ncols * sizeof (int));