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[/] [openrisc/] [trunk/] [gnu-old/] [gdb-7.1/] [gdb/] [blockframe.c] - Diff between revs 834 and 842

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/* Get info from stack frames; convert between frames, blocks,
/* Get info from stack frames; convert between frames, blocks,
   functions and pc values.
   functions and pc values.
 
 
   Copyright (C) 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995,
   Copyright (C) 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995,
   1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2007, 2008, 2009,
   1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2007, 2008, 2009,
   2010 Free Software Foundation, Inc.
   2010 Free Software Foundation, Inc.
 
 
   This file is part of GDB.
   This file is part of GDB.
 
 
   This program is free software; you can redistribute it and/or modify
   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3 of the License, or
   the Free Software Foundation; either version 3 of the License, or
   (at your option) any later version.
   (at your option) any later version.
 
 
   This program is distributed in the hope that it will be useful,
   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
   GNU General Public License for more details.
 
 
   You should have received a copy of the GNU General Public License
   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
 
 
#include "defs.h"
#include "defs.h"
#include "symtab.h"
#include "symtab.h"
#include "bfd.h"
#include "bfd.h"
#include "objfiles.h"
#include "objfiles.h"
#include "frame.h"
#include "frame.h"
#include "gdbcore.h"
#include "gdbcore.h"
#include "value.h"
#include "value.h"
#include "target.h"
#include "target.h"
#include "inferior.h"
#include "inferior.h"
#include "annotate.h"
#include "annotate.h"
#include "regcache.h"
#include "regcache.h"
#include "gdb_assert.h"
#include "gdb_assert.h"
#include "dummy-frame.h"
#include "dummy-frame.h"
#include "command.h"
#include "command.h"
#include "gdbcmd.h"
#include "gdbcmd.h"
#include "block.h"
#include "block.h"
#include "inline-frame.h"
#include "inline-frame.h"
 
 
/* Return the innermost lexical block in execution
/* Return the innermost lexical block in execution
   in a specified stack frame.  The frame address is assumed valid.
   in a specified stack frame.  The frame address is assumed valid.
 
 
   If ADDR_IN_BLOCK is non-zero, set *ADDR_IN_BLOCK to the exact code
   If ADDR_IN_BLOCK is non-zero, set *ADDR_IN_BLOCK to the exact code
   address we used to choose the block.  We use this to find a source
   address we used to choose the block.  We use this to find a source
   line, to decide which macro definitions are in scope.
   line, to decide which macro definitions are in scope.
 
 
   The value returned in *ADDR_IN_BLOCK isn't necessarily the frame's
   The value returned in *ADDR_IN_BLOCK isn't necessarily the frame's
   PC, and may not really be a valid PC at all.  For example, in the
   PC, and may not really be a valid PC at all.  For example, in the
   caller of a function declared to never return, the code at the
   caller of a function declared to never return, the code at the
   return address will never be reached, so the call instruction may
   return address will never be reached, so the call instruction may
   be the very last instruction in the block.  So the address we use
   be the very last instruction in the block.  So the address we use
   to choose the block is actually one byte before the return address
   to choose the block is actually one byte before the return address
   --- hopefully pointing us at the call instruction, or its delay
   --- hopefully pointing us at the call instruction, or its delay
   slot instruction.  */
   slot instruction.  */
 
 
struct block *
struct block *
get_frame_block (struct frame_info *frame, CORE_ADDR *addr_in_block)
get_frame_block (struct frame_info *frame, CORE_ADDR *addr_in_block)
{
{
  const CORE_ADDR pc = get_frame_address_in_block (frame);
  const CORE_ADDR pc = get_frame_address_in_block (frame);
  struct frame_info *next_frame;
  struct frame_info *next_frame;
  struct block *bl;
  struct block *bl;
  int inline_count;
  int inline_count;
 
 
  if (addr_in_block)
  if (addr_in_block)
    *addr_in_block = pc;
    *addr_in_block = pc;
 
 
  bl = block_for_pc (pc);
  bl = block_for_pc (pc);
  if (bl == NULL)
  if (bl == NULL)
    return NULL;
    return NULL;
 
 
  inline_count = frame_inlined_callees (frame);
  inline_count = frame_inlined_callees (frame);
 
 
  while (inline_count > 0)
  while (inline_count > 0)
    {
    {
      if (block_inlined_p (bl))
      if (block_inlined_p (bl))
        inline_count--;
        inline_count--;
 
 
      bl = BLOCK_SUPERBLOCK (bl);
      bl = BLOCK_SUPERBLOCK (bl);
      gdb_assert (bl != NULL);
      gdb_assert (bl != NULL);
    }
    }
 
 
  return bl;
  return bl;
}
}
 
 
CORE_ADDR
CORE_ADDR
get_pc_function_start (CORE_ADDR pc)
get_pc_function_start (CORE_ADDR pc)
{
{
  struct block *bl;
  struct block *bl;
  struct minimal_symbol *msymbol;
  struct minimal_symbol *msymbol;
 
 
  bl = block_for_pc (pc);
  bl = block_for_pc (pc);
  if (bl)
  if (bl)
    {
    {
      struct symbol *symbol = block_linkage_function (bl);
      struct symbol *symbol = block_linkage_function (bl);
 
 
      if (symbol)
      if (symbol)
        {
        {
          bl = SYMBOL_BLOCK_VALUE (symbol);
          bl = SYMBOL_BLOCK_VALUE (symbol);
          return BLOCK_START (bl);
          return BLOCK_START (bl);
        }
        }
    }
    }
 
 
  msymbol = lookup_minimal_symbol_by_pc (pc);
  msymbol = lookup_minimal_symbol_by_pc (pc);
  if (msymbol)
  if (msymbol)
    {
    {
      CORE_ADDR fstart = SYMBOL_VALUE_ADDRESS (msymbol);
      CORE_ADDR fstart = SYMBOL_VALUE_ADDRESS (msymbol);
 
 
      if (find_pc_section (fstart))
      if (find_pc_section (fstart))
        return fstart;
        return fstart;
    }
    }
 
 
  return 0;
  return 0;
}
}
 
 
/* Return the symbol for the function executing in frame FRAME.  */
/* Return the symbol for the function executing in frame FRAME.  */
 
 
struct symbol *
struct symbol *
get_frame_function (struct frame_info *frame)
get_frame_function (struct frame_info *frame)
{
{
  struct block *bl = get_frame_block (frame, 0);
  struct block *bl = get_frame_block (frame, 0);
 
 
  if (bl == NULL)
  if (bl == NULL)
    return NULL;
    return NULL;
 
 
  while (BLOCK_FUNCTION (bl) == NULL && BLOCK_SUPERBLOCK (bl) != NULL)
  while (BLOCK_FUNCTION (bl) == NULL && BLOCK_SUPERBLOCK (bl) != NULL)
    bl = BLOCK_SUPERBLOCK (bl);
    bl = BLOCK_SUPERBLOCK (bl);
 
 
  return BLOCK_FUNCTION (bl);
  return BLOCK_FUNCTION (bl);
}
}


 
 
/* Return the function containing pc value PC in section SECTION.
/* Return the function containing pc value PC in section SECTION.
   Returns 0 if function is not known.  */
   Returns 0 if function is not known.  */
 
 
struct symbol *
struct symbol *
find_pc_sect_function (CORE_ADDR pc, struct obj_section *section)
find_pc_sect_function (CORE_ADDR pc, struct obj_section *section)
{
{
  struct block *b = block_for_pc_sect (pc, section);
  struct block *b = block_for_pc_sect (pc, section);
  if (b == 0)
  if (b == 0)
    return 0;
    return 0;
  return block_linkage_function (b);
  return block_linkage_function (b);
}
}
 
 
/* Return the function containing pc value PC.
/* Return the function containing pc value PC.
   Returns 0 if function is not known.  Backward compatibility, no section */
   Returns 0 if function is not known.  Backward compatibility, no section */
 
 
struct symbol *
struct symbol *
find_pc_function (CORE_ADDR pc)
find_pc_function (CORE_ADDR pc)
{
{
  return find_pc_sect_function (pc, find_pc_mapped_section (pc));
  return find_pc_sect_function (pc, find_pc_mapped_section (pc));
}
}
 
 
/* These variables are used to cache the most recent result
/* These variables are used to cache the most recent result
 * of find_pc_partial_function. */
 * of find_pc_partial_function. */
 
 
static CORE_ADDR cache_pc_function_low = 0;
static CORE_ADDR cache_pc_function_low = 0;
static CORE_ADDR cache_pc_function_high = 0;
static CORE_ADDR cache_pc_function_high = 0;
static char *cache_pc_function_name = 0;
static char *cache_pc_function_name = 0;
static struct obj_section *cache_pc_function_section = NULL;
static struct obj_section *cache_pc_function_section = NULL;
 
 
/* Clear cache, e.g. when symbol table is discarded. */
/* Clear cache, e.g. when symbol table is discarded. */
 
 
void
void
clear_pc_function_cache (void)
clear_pc_function_cache (void)
{
{
  cache_pc_function_low = 0;
  cache_pc_function_low = 0;
  cache_pc_function_high = 0;
  cache_pc_function_high = 0;
  cache_pc_function_name = (char *) 0;
  cache_pc_function_name = (char *) 0;
  cache_pc_function_section = NULL;
  cache_pc_function_section = NULL;
}
}
 
 
/* Finds the "function" (text symbol) that is smaller than PC but
/* Finds the "function" (text symbol) that is smaller than PC but
   greatest of all of the potential text symbols in SECTION.  Sets
   greatest of all of the potential text symbols in SECTION.  Sets
   *NAME and/or *ADDRESS conditionally if that pointer is non-null.
   *NAME and/or *ADDRESS conditionally if that pointer is non-null.
   If ENDADDR is non-null, then set *ENDADDR to be the end of the
   If ENDADDR is non-null, then set *ENDADDR to be the end of the
   function (exclusive), but passing ENDADDR as non-null means that
   function (exclusive), but passing ENDADDR as non-null means that
   the function might cause symbols to be read.  This function either
   the function might cause symbols to be read.  This function either
   succeeds or fails (not halfway succeeds).  If it succeeds, it sets
   succeeds or fails (not halfway succeeds).  If it succeeds, it sets
   *NAME, *ADDRESS, and *ENDADDR to real information and returns 1.
   *NAME, *ADDRESS, and *ENDADDR to real information and returns 1.
   If it fails, it sets *NAME, *ADDRESS, and *ENDADDR to zero and
   If it fails, it sets *NAME, *ADDRESS, and *ENDADDR to zero and
   returns 0.  */
   returns 0.  */
 
 
/* Backward compatibility, no section argument.  */
/* Backward compatibility, no section argument.  */
 
 
int
int
find_pc_partial_function (CORE_ADDR pc, char **name, CORE_ADDR *address,
find_pc_partial_function (CORE_ADDR pc, char **name, CORE_ADDR *address,
                          CORE_ADDR *endaddr)
                          CORE_ADDR *endaddr)
{
{
  struct obj_section *section;
  struct obj_section *section;
  struct partial_symtab *pst;
  struct partial_symtab *pst;
  struct symbol *f;
  struct symbol *f;
  struct minimal_symbol *msymbol;
  struct minimal_symbol *msymbol;
  struct partial_symbol *psb;
  struct partial_symbol *psb;
  int i;
  int i;
  CORE_ADDR mapped_pc;
  CORE_ADDR mapped_pc;
 
 
  /* To ensure that the symbol returned belongs to the correct setion
  /* To ensure that the symbol returned belongs to the correct setion
     (and that the last [random] symbol from the previous section
     (and that the last [random] symbol from the previous section
     isn't returned) try to find the section containing PC.  First try
     isn't returned) try to find the section containing PC.  First try
     the overlay code (which by default returns NULL); and second try
     the overlay code (which by default returns NULL); and second try
     the normal section code (which almost always succeeds).  */
     the normal section code (which almost always succeeds).  */
  section = find_pc_overlay (pc);
  section = find_pc_overlay (pc);
  if (section == NULL)
  if (section == NULL)
    section = find_pc_section (pc);
    section = find_pc_section (pc);
 
 
  mapped_pc = overlay_mapped_address (pc, section);
  mapped_pc = overlay_mapped_address (pc, section);
 
 
  if (mapped_pc >= cache_pc_function_low
  if (mapped_pc >= cache_pc_function_low
      && mapped_pc < cache_pc_function_high
      && mapped_pc < cache_pc_function_high
      && section == cache_pc_function_section)
      && section == cache_pc_function_section)
    goto return_cached_value;
    goto return_cached_value;
 
 
  msymbol = lookup_minimal_symbol_by_pc_section (mapped_pc, section);
  msymbol = lookup_minimal_symbol_by_pc_section (mapped_pc, section);
  pst = find_pc_sect_psymtab (mapped_pc, section);
  pst = find_pc_sect_psymtab (mapped_pc, section);
  if (pst)
  if (pst)
    {
    {
      /* Need to read the symbols to get a good value for the end address.  */
      /* Need to read the symbols to get a good value for the end address.  */
      if (endaddr != NULL && !pst->readin)
      if (endaddr != NULL && !pst->readin)
        {
        {
          /* Need to get the terminal in case symbol-reading produces
          /* Need to get the terminal in case symbol-reading produces
             output.  */
             output.  */
          target_terminal_ours_for_output ();
          target_terminal_ours_for_output ();
          PSYMTAB_TO_SYMTAB (pst);
          PSYMTAB_TO_SYMTAB (pst);
        }
        }
 
 
      if (pst->readin)
      if (pst->readin)
        {
        {
          /* Checking whether the msymbol has a larger value is for the
          /* Checking whether the msymbol has a larger value is for the
             "pathological" case mentioned in print_frame_info.  */
             "pathological" case mentioned in print_frame_info.  */
          f = find_pc_sect_function (mapped_pc, section);
          f = find_pc_sect_function (mapped_pc, section);
          if (f != NULL
          if (f != NULL
              && (msymbol == NULL
              && (msymbol == NULL
                  || (BLOCK_START (SYMBOL_BLOCK_VALUE (f))
                  || (BLOCK_START (SYMBOL_BLOCK_VALUE (f))
                      >= SYMBOL_VALUE_ADDRESS (msymbol))))
                      >= SYMBOL_VALUE_ADDRESS (msymbol))))
            {
            {
              cache_pc_function_low = BLOCK_START (SYMBOL_BLOCK_VALUE (f));
              cache_pc_function_low = BLOCK_START (SYMBOL_BLOCK_VALUE (f));
              cache_pc_function_high = BLOCK_END (SYMBOL_BLOCK_VALUE (f));
              cache_pc_function_high = BLOCK_END (SYMBOL_BLOCK_VALUE (f));
              cache_pc_function_name = SYMBOL_LINKAGE_NAME (f);
              cache_pc_function_name = SYMBOL_LINKAGE_NAME (f);
              cache_pc_function_section = section;
              cache_pc_function_section = section;
              goto return_cached_value;
              goto return_cached_value;
            }
            }
        }
        }
      else
      else
        {
        {
          /* Now that static symbols go in the minimal symbol table, perhaps
          /* Now that static symbols go in the minimal symbol table, perhaps
             we could just ignore the partial symbols.  But at least for now
             we could just ignore the partial symbols.  But at least for now
             we use the partial or minimal symbol, whichever is larger.  */
             we use the partial or minimal symbol, whichever is larger.  */
          psb = find_pc_sect_psymbol (pst, mapped_pc, section);
          psb = find_pc_sect_psymbol (pst, mapped_pc, section);
 
 
          if (psb
          if (psb
              && (msymbol == NULL
              && (msymbol == NULL
                  || (SYMBOL_VALUE_ADDRESS (psb)
                  || (SYMBOL_VALUE_ADDRESS (psb)
                      >= SYMBOL_VALUE_ADDRESS (msymbol))))
                      >= SYMBOL_VALUE_ADDRESS (msymbol))))
            {
            {
              /* This case isn't being cached currently. */
              /* This case isn't being cached currently. */
              if (address)
              if (address)
                *address = SYMBOL_VALUE_ADDRESS (psb);
                *address = SYMBOL_VALUE_ADDRESS (psb);
              if (name)
              if (name)
                *name = SYMBOL_LINKAGE_NAME (psb);
                *name = SYMBOL_LINKAGE_NAME (psb);
              /* endaddr non-NULL can't happen here.  */
              /* endaddr non-NULL can't happen here.  */
              return 1;
              return 1;
            }
            }
        }
        }
    }
    }
 
 
  /* Not in the normal symbol tables, see if the pc is in a known section.
  /* Not in the normal symbol tables, see if the pc is in a known section.
     If it's not, then give up.  This ensures that anything beyond the end
     If it's not, then give up.  This ensures that anything beyond the end
     of the text seg doesn't appear to be part of the last function in the
     of the text seg doesn't appear to be part of the last function in the
     text segment.  */
     text segment.  */
 
 
  if (!section)
  if (!section)
    msymbol = NULL;
    msymbol = NULL;
 
 
  /* Must be in the minimal symbol table.  */
  /* Must be in the minimal symbol table.  */
  if (msymbol == NULL)
  if (msymbol == NULL)
    {
    {
      /* No available symbol.  */
      /* No available symbol.  */
      if (name != NULL)
      if (name != NULL)
        *name = 0;
        *name = 0;
      if (address != NULL)
      if (address != NULL)
        *address = 0;
        *address = 0;
      if (endaddr != NULL)
      if (endaddr != NULL)
        *endaddr = 0;
        *endaddr = 0;
      return 0;
      return 0;
    }
    }
 
 
  cache_pc_function_low = SYMBOL_VALUE_ADDRESS (msymbol);
  cache_pc_function_low = SYMBOL_VALUE_ADDRESS (msymbol);
  cache_pc_function_name = SYMBOL_LINKAGE_NAME (msymbol);
  cache_pc_function_name = SYMBOL_LINKAGE_NAME (msymbol);
  cache_pc_function_section = section;
  cache_pc_function_section = section;
 
 
  /* If the minimal symbol has a size, use it for the cache.
  /* If the minimal symbol has a size, use it for the cache.
     Otherwise use the lesser of the next minimal symbol in the same
     Otherwise use the lesser of the next minimal symbol in the same
     section, or the end of the section, as the end of the
     section, or the end of the section, as the end of the
     function.  */
     function.  */
 
 
  if (MSYMBOL_SIZE (msymbol) != 0)
  if (MSYMBOL_SIZE (msymbol) != 0)
    cache_pc_function_high = cache_pc_function_low + MSYMBOL_SIZE (msymbol);
    cache_pc_function_high = cache_pc_function_low + MSYMBOL_SIZE (msymbol);
  else
  else
    {
    {
      /* Step over other symbols at this same address, and symbols in
      /* Step over other symbols at this same address, and symbols in
         other sections, to find the next symbol in this section with
         other sections, to find the next symbol in this section with
         a different address.  */
         a different address.  */
 
 
      for (i = 1; SYMBOL_LINKAGE_NAME (msymbol + i) != NULL; i++)
      for (i = 1; SYMBOL_LINKAGE_NAME (msymbol + i) != NULL; i++)
        {
        {
          if (SYMBOL_VALUE_ADDRESS (msymbol + i) != SYMBOL_VALUE_ADDRESS (msymbol)
          if (SYMBOL_VALUE_ADDRESS (msymbol + i) != SYMBOL_VALUE_ADDRESS (msymbol)
              && SYMBOL_OBJ_SECTION (msymbol + i) == SYMBOL_OBJ_SECTION (msymbol))
              && SYMBOL_OBJ_SECTION (msymbol + i) == SYMBOL_OBJ_SECTION (msymbol))
            break;
            break;
        }
        }
 
 
      if (SYMBOL_LINKAGE_NAME (msymbol + i) != NULL
      if (SYMBOL_LINKAGE_NAME (msymbol + i) != NULL
          && SYMBOL_VALUE_ADDRESS (msymbol + i) < obj_section_endaddr (section))
          && SYMBOL_VALUE_ADDRESS (msymbol + i) < obj_section_endaddr (section))
        cache_pc_function_high = SYMBOL_VALUE_ADDRESS (msymbol + i);
        cache_pc_function_high = SYMBOL_VALUE_ADDRESS (msymbol + i);
      else
      else
        /* We got the start address from the last msymbol in the objfile.
        /* We got the start address from the last msymbol in the objfile.
           So the end address is the end of the section.  */
           So the end address is the end of the section.  */
        cache_pc_function_high = obj_section_endaddr (section);
        cache_pc_function_high = obj_section_endaddr (section);
    }
    }
 
 
 return_cached_value:
 return_cached_value:
 
 
  if (address)
  if (address)
    {
    {
      if (pc_in_unmapped_range (pc, section))
      if (pc_in_unmapped_range (pc, section))
        *address = overlay_unmapped_address (cache_pc_function_low, section);
        *address = overlay_unmapped_address (cache_pc_function_low, section);
      else
      else
        *address = cache_pc_function_low;
        *address = cache_pc_function_low;
    }
    }
 
 
  if (name)
  if (name)
    *name = cache_pc_function_name;
    *name = cache_pc_function_name;
 
 
  if (endaddr)
  if (endaddr)
    {
    {
      if (pc_in_unmapped_range (pc, section))
      if (pc_in_unmapped_range (pc, section))
        {
        {
          /* Because the high address is actually beyond the end of
          /* Because the high address is actually beyond the end of
             the function (and therefore possibly beyond the end of
             the function (and therefore possibly beyond the end of
             the overlay), we must actually convert (high - 1) and
             the overlay), we must actually convert (high - 1) and
             then add one to that. */
             then add one to that. */
 
 
          *endaddr = 1 + overlay_unmapped_address (cache_pc_function_high - 1,
          *endaddr = 1 + overlay_unmapped_address (cache_pc_function_high - 1,
                                                   section);
                                                   section);
        }
        }
      else
      else
        *endaddr = cache_pc_function_high;
        *endaddr = cache_pc_function_high;
    }
    }
 
 
  return 1;
  return 1;
}
}
 
 
/* Return the innermost stack frame executing inside of BLOCK,
/* Return the innermost stack frame executing inside of BLOCK,
   or NULL if there is no such frame.  If BLOCK is NULL, just return NULL.  */
   or NULL if there is no such frame.  If BLOCK is NULL, just return NULL.  */
 
 
struct frame_info *
struct frame_info *
block_innermost_frame (struct block *block)
block_innermost_frame (struct block *block)
{
{
  struct frame_info *frame;
  struct frame_info *frame;
  CORE_ADDR start;
  CORE_ADDR start;
  CORE_ADDR end;
  CORE_ADDR end;
 
 
  if (block == NULL)
  if (block == NULL)
    return NULL;
    return NULL;
 
 
  start = BLOCK_START (block);
  start = BLOCK_START (block);
  end = BLOCK_END (block);
  end = BLOCK_END (block);
 
 
  frame = get_current_frame ();
  frame = get_current_frame ();
  while (frame != NULL)
  while (frame != NULL)
    {
    {
      struct block *frame_block = get_frame_block (frame, NULL);
      struct block *frame_block = get_frame_block (frame, NULL);
      if (frame_block != NULL && contained_in (frame_block, block))
      if (frame_block != NULL && contained_in (frame_block, block))
        return frame;
        return frame;
 
 
      frame = get_prev_frame (frame);
      frame = get_prev_frame (frame);
    }
    }
 
 
  return NULL;
  return NULL;
}
}
 
 

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