19990502 sourceware importbinu_ss_19990502

1 files changed, 576 insertions, 0 deletions

diff --git a/bfd/dwarf1.c b/bfd/dwarf1.c
new file mode 100644
index 0000000..cbcc26b
--- /dev/null
+++ b/bfd/dwarf1.c
@@ -0,0 +1,576 @@
+/* DWARF 1 find nearest line (_bfd_dwarf1_find_nearest_line).
+   Copyright 1998 Free Software Foundation, Inc.
+
+Written by Gavin Romig-Koch of Cygnus Solutions (gavin@cygnus.com).  
+
+This file is part of BFD.
+
+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
+the Free Software Foundation; either version 2 of the License, or (at
+your option) any later version.
+
+This program is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program; if not, write to the Free Software
+Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
+
+#include "bfd.h"
+#include "sysdep.h"
+#include "libiberty.h"
+#include "libbfd.h"
+#include "elf-bfd.h"
+#include "elf/dwarf.h"
+
+/* dwarf1_debug is the starting point for all dwarf1 info. */
+
+struct dwarf1_debug {
+
+  /* The bfd we are working with. */
+  bfd* abfd;
+
+  /* List of already parsed compilation units. */
+  struct dwarf1_unit* lastUnit;
+
+  /* The buffer for the .debug section. 
+     Zero indicates that the .debug section failed to load. */
+  char* debug_section;
+
+  /* Pointer to the end of the .debug_info section memory buffer. */
+  char* debug_section_end;
+
+  /* The buffer for the .line section. */
+  char* line_section;
+
+  /* End of that buffer. */
+  char* line_section_end;
+
+  /* The current or next unread die within the .debug section. */
+  char* currentDie;
+};
+
+/* One dwarf1_unit for each parsed compilation unit die. */
+
+struct dwarf1_unit {
+  /* Linked starting from stash->lastUnit. */
+  struct dwarf1_unit* prev;
+
+  /* Name of the compilation unit. */
+  char* name;
+
+  /* The highest and lowest address used in the compilation unit. */
+  unsigned long low_pc;
+  unsigned long high_pc;
+
+  /* Does this unit have a statement list? */
+  int has_stmt_list;
+
+  /* If any, the offset of the line number table in the .line section. */
+  unsigned long stmt_list_offset;
+
+  /* If non-zero, a pointer to the first child of this unit. */
+  char* first_child;
+
+  /* How many line entries? */
+  unsigned long line_count;
+
+  /* The decoded line number table (line_count entries). */
+  struct linenumber* linenumber_table;
+
+  /* The list of functions in this unit. */
+  struct dwarf1_func* func_list;
+};
+
+
+
+/* One dwarf1_func for each parsed function die.  */
+
+struct dwarf1_func {
+  /* Linked starting from aUnit->func_list. */
+  struct dwarf1_func* prev;
+  
+  /* Name of function. */
+  char* name;
+  
+  /* The highest and lowest address used in the compilation unit. */
+  unsigned long low_pc;
+  unsigned long high_pc;
+};
+
+
+/* Used to return info about a parsed die. */
+struct die_info {
+  unsigned long length;
+  unsigned long sibling;
+  unsigned long low_pc;
+  unsigned long high_pc;
+  unsigned long stmt_list_offset;
+  
+  char* name; 
+  
+  int has_stmt_list;
+
+  unsigned short tag;
+};
+
+
+/* Parsed line number information. */
+struct linenumber {
+  /* First address in the line. */
+  unsigned long addr;
+
+  /* The line number. */
+  unsigned long linenumber;
+};
+
+
+/* Find the form of an attr, from the attr field. */
+#define FORM_FROM_ATTR(attr)	((attr) & 0xF)	/* Implicitly specified */
+
+
+/* Return a newly allocated dwarf1_unit.  It should be cleared and
+   then attached into the 'stash' at 'stash->lastUnit'. */
+
+static struct dwarf1_unit*
+alloc_dwarf1_unit (stash)
+  struct dwarf1_debug* stash;
+{
+  struct dwarf1_unit* x = 
+    (struct dwarf1_unit*) bfd_alloc (stash->abfd, 
+				       sizeof (struct dwarf1_unit));
+  x->prev = stash->lastUnit;
+  stash->lastUnit = x;
+
+  return x;
+}
+
+/* Return a newly allocated dwarf1_func.  It must be cleared and
+   attached into 'aUnit' at 'aUnit->func_list'. */
+
+static struct dwarf1_func*
+alloc_dwarf1_func (stash, aUnit)
+     struct dwarf1_debug* stash;
+     struct dwarf1_unit* aUnit;
+{
+  struct dwarf1_func* x = 
+    (struct dwarf1_func*) bfd_alloc (stash->abfd, 
+				  sizeof (struct dwarf1_func));
+  x->prev = aUnit->func_list;
+  aUnit->func_list = x;
+  
+  return x;
+}
+
+/* parse_die - parse a Dwarf1 die.
+   Parse the die starting at 'aDiePtr' into 'aDieInfo'.
+   'abfd' must be the bfd from which the section that 'aDiePtr'
+   points to was pulled from. 
+
+   Return false if the die is invalidly formatted; true otherwise. */
+
+static boolean
+parse_die (abfd, aDieInfo, aDiePtr)
+     bfd* abfd;
+     struct die_info* aDieInfo;
+     char*            aDiePtr;
+{
+  char* this_die = aDiePtr;
+  char* xptr = this_die;
+
+  memset (aDieInfo,0,sizeof(*aDieInfo));
+
+  /* First comes the length. */
+  aDieInfo->length = bfd_get_32 (abfd, xptr);
+  xptr += 4;
+  if (aDieInfo->length < 6)
+    {
+      /* Just padding bytes. */
+      aDieInfo->tag = TAG_padding;
+      return true;
+    }
+
+  /* Then the tag. */
+  aDieInfo->tag = bfd_get_16 (abfd, xptr);
+  xptr += 2;
+      
+  /* Then the attributes. */
+  while (xptr < (this_die + aDieInfo->length))
+    {
+      unsigned short attr;
+      
+      /* Parse the attribute based on its form.  This section 
+         must handle all dwarf1 forms, but need only handle the
+	 actual attributes that we care about. */
+
+      attr = bfd_get_16 (abfd, xptr);
+      xptr += 2;
+      
+      switch (FORM_FROM_ATTR (attr))
+	{
+	case FORM_DATA2:
+	  xptr += 2;
+	  break;
+	case FORM_DATA4:
+	case FORM_REF:
+	  if (attr == AT_sibling)
+	    aDieInfo->sibling = bfd_get_32 (abfd, xptr);
+	  else if (attr == AT_stmt_list)
+	    {
+	      aDieInfo->stmt_list_offset = bfd_get_32 (abfd, xptr);
+	      aDieInfo->has_stmt_list = 1;
+	    }
+	  xptr += 4;
+	  break;
+	case FORM_DATA8:
+	  xptr += 8;
+	  break;
+	case FORM_ADDR:
+	  if (attr == AT_low_pc)
+	    aDieInfo->low_pc = bfd_get_32 (abfd, xptr);
+	  else if (attr == AT_high_pc)
+	    aDieInfo->high_pc = bfd_get_32 (abfd, xptr);
+	  xptr += 4;
+	  break;
+	case FORM_BLOCK2:
+	  xptr += 2 + bfd_get_16 (abfd, xptr);
+	  break;
+	case FORM_BLOCK4:
+	  xptr += 4 + bfd_get_32 (abfd, xptr);
+	  break;
+	case FORM_STRING:
+	  if (attr == AT_name)
+	    aDieInfo->name = xptr;
+	  xptr += strlen (xptr) + 1;
+	  break;
+	}
+    }
+
+  return true;
+}
+
+/* Parse a dwarf1 line number table for 'aUnit->stmt_list_offset'
+   into 'aUnit->linenumber_table'.  Return false if an error 
+   occurs; true otherwise. */
+  
+static boolean
+parse_line_table (stash, aUnit)
+  struct dwarf1_debug* stash;
+  struct dwarf1_unit* aUnit;
+{
+  char* xptr;
+
+  /* Load the ".line" section from the bfd if we haven't already. */ 
+  if (stash->line_section == 0)
+    {
+      asection *msec;
+      unsigned long size;
+      
+      msec = bfd_get_section_by_name (stash->abfd, ".line");
+      if (! msec)
+	return false;
+	  
+      size = bfd_get_section_size_before_reloc (msec);
+      stash->line_section = (unsigned char*) bfd_alloc (stash->abfd, size);
+      
+      if (! stash->line_section)
+	return false;
+
+      if (! bfd_get_section_contents (stash->abfd, msec, stash->line_section, 0, size))
+	{
+	  stash->line_section = 0;
+	  return false;
+	}
+
+      stash->line_section_end = stash->line_section + size;
+    }
+
+  xptr = stash->line_section + aUnit->stmt_list_offset;
+  if (xptr < stash->line_section_end)
+    {
+      int eachLine;
+
+      char* tblend;
+      unsigned long base;
+
+      /* First comes the length. */
+      tblend = bfd_get_32 (stash->abfd, xptr) + xptr;
+      xptr += 4;
+
+      /* Then the base address for each address in the table. */
+      base = bfd_get_32 (stash->abfd, xptr);
+      xptr += 4;
+
+      /* How many line entrys?
+	 10 = 4 (line number) + 2 (pos in line) + 4 (address in line) */
+      aUnit->line_count = (tblend - xptr) / 10;
+
+      /* Allocate an array for the entries. */
+      aUnit->linenumber_table = (struct linenumber*)
+	bfd_alloc (stash->abfd, 
+		   sizeof (struct linenumber) * aUnit->line_count);
+	
+      for (eachLine = 0; eachLine < aUnit->line_count; eachLine++)
+	{
+	  /* A line number. */
+	  aUnit->linenumber_table[eachLine].linenumber
+	    = bfd_get_32 (stash->abfd, xptr);
+	  xptr += 4;
+
+	  /* Skip the position within the line. */
+	  xptr += 2;
+
+	  /* And finally the address. */
+	  aUnit->linenumber_table[eachLine].addr 
+	    = base + bfd_get_32 (stash->abfd, xptr);
+	  xptr += 4;
+	}
+    }
+
+  return true;
+}
+
+/* Parse each function die in a compilation unit 'aUnit'.
+   The first child die of 'aUnit' should be in 'aUnit->first_child',
+   the result is placed in 'aUnit->func_list'.
+   Return false if error; true otherwise. */
+
+static boolean
+parse_functions_in_unit (stash, aUnit)
+     struct dwarf1_debug* stash;
+     struct dwarf1_unit* aUnit;
+{
+  char* eachDie;
+
+  if (aUnit->first_child)
+    for (eachDie = aUnit->first_child;
+	 eachDie < stash->debug_section_end;
+	 )
+      {
+	struct die_info eachDieInfo;
+	
+	if (! parse_die (stash->abfd, &eachDieInfo, eachDie))
+	  return false;
+	
+	if (eachDieInfo.tag == TAG_global_subroutine
+	    || eachDieInfo.tag == TAG_subroutine
+	    || eachDieInfo.tag == TAG_inlined_subroutine
+	    || eachDieInfo.tag == TAG_entry_point)
+	  {
+	    struct dwarf1_func* aFunc = alloc_dwarf1_func (stash,aUnit);
+	    
+	    aFunc->name = eachDieInfo.name;
+	    aFunc->low_pc = eachDieInfo.low_pc;
+	    aFunc->high_pc = eachDieInfo.high_pc;
+	  }
+	
+	/* Move to next sibling, if none, end loop */
+	if (eachDieInfo.sibling)
+	  eachDie = stash->debug_section + eachDieInfo.sibling;
+	else
+	  break;
+      }
+  
+  return true;
+}
+
+/* Find the nearest line to 'addr' in 'aUnit'.
+   Return whether we found the line (or a function) without error. */
+
+static boolean
+dwarf1_unit_find_nearest_line (stash, aUnit, addr, 
+		       filename_ptr, functionname_ptr,
+		       linenumber_ptr)
+  struct dwarf1_debug* stash;
+  struct dwarf1_unit* aUnit;
+  unsigned long addr;
+  const char **filename_ptr;
+  const char **functionname_ptr;
+  unsigned int *linenumber_ptr;
+{
+  int line_p = false;
+  int func_p = false;
+
+  if (aUnit->low_pc <= addr && addr < aUnit->high_pc)
+    {
+      if (aUnit->has_stmt_list)
+	{
+	  int i;
+	  struct dwarf1_func* eachFunc;
+
+	  if (! aUnit->linenumber_table)
+	    {
+	      if (! parse_line_table (stash, aUnit))
+		return false;
+	    }
+
+	  if (! aUnit->func_list)
+	    {
+	      if (! parse_functions_in_unit (stash, aUnit))
+		return false;
+	    }
+
+	  for (i = 0; i < aUnit->line_count; i++)
+	    {
+	      if (aUnit->linenumber_table[i].addr <= addr
+		  && addr < aUnit->linenumber_table[i+1].addr)
+		{
+		  *filename_ptr = aUnit->name;
+		  *linenumber_ptr = aUnit->linenumber_table[i].linenumber;
+		  line_p = true;
+		  break;
+		}
+	    }
+
+	  for (eachFunc = aUnit->func_list; 
+	       eachFunc; 
+	       eachFunc = eachFunc->prev)
+	    {
+	      if (eachFunc->low_pc <= addr
+		  && addr < eachFunc->high_pc)
+		{
+		  *functionname_ptr = eachFunc->name;
+		  func_p = true;
+		  break;
+		}
+	    }
+	}
+    }
+
+  return line_p || func_p;
+}
+
+
+
+
+/* The DWARF 1 version of find_nearest line.
+   Return true if the line is found without error. */
+
+boolean
+_bfd_dwarf1_find_nearest_line (abfd, section, symbols, offset,
+                              filename_ptr, functionname_ptr, linenumber_ptr)
+     bfd *abfd;
+     asection *section;
+     asymbol **symbols;
+     bfd_vma offset;
+     const char **filename_ptr;
+     const char **functionname_ptr;
+     unsigned int *linenumber_ptr;
+{
+  struct dwarf1_debug *stash = elf_tdata (abfd)->dwarf1_find_line_info;
+
+  struct dwarf1_unit* eachUnit;
+
+  /* What address are we looking for? */
+  bfd_vma addr = offset + section->vma;
+
+  *filename_ptr = NULL;
+  *functionname_ptr = NULL;
+  *linenumber_ptr = 0;
+  
+
+  if (! stash)
+    {
+      asection *msec;
+      unsigned long size;
+      
+      stash = elf_tdata (abfd)->dwarf1_find_line_info =
+	(struct dwarf1_debug*) bfd_zalloc (abfd, sizeof (struct dwarf1_debug));
+      
+      if (! stash)
+	return false;
+      
+      msec = bfd_get_section_by_name (abfd, ".debug");
+      if (! msec)
+	{
+	  /* No dwarf1 info.  Note that at this point the stash
+	     has been allocated, but contains zeros, this lets
+	     future calls to this function fail quicker. */
+	  return false;
+	}
+
+      size = bfd_get_section_size_before_reloc (msec);
+      stash->debug_section = (unsigned char*) bfd_alloc (abfd, size);
+      
+      if (! stash->debug_section)
+	return false;
+
+      if (! bfd_get_section_contents (abfd, msec, stash->debug_section, 0, size))
+	{
+	  stash->debug_section = 0;
+	  return false;
+	}
+
+      stash->debug_section_end = stash->debug_section + size;
+      stash->currentDie = stash->debug_section;
+      stash->abfd = abfd;
+    }
+
+  /* A null debug_section indicates that there was no dwarf1 info
+     or that an error occured while setting up the stash. */
+
+  if (! stash->debug_section)
+    return false;
+  
+
+  /* Look at the previously parsed units to see if any contain
+     the addr. */
+  for (eachUnit = stash->lastUnit; eachUnit; eachUnit = eachUnit->prev)
+    {
+      if (eachUnit->low_pc <= addr && addr < eachUnit->high_pc)
+	return dwarf1_unit_find_nearest_line (stash, eachUnit, addr,
+					      filename_ptr, 
+					      functionname_ptr, 
+					      linenumber_ptr);
+    }
+
+  while (stash->currentDie < stash->debug_section_end)
+    {
+      struct die_info aDieInfo;
+
+      if (! parse_die (stash->abfd, &aDieInfo, stash->currentDie))
+	return false;
+      
+      if (aDieInfo.tag == TAG_compile_unit)
+	{
+	  struct dwarf1_unit* aUnit
+	    = alloc_dwarf1_unit (stash);
+	  
+	  aUnit->name = aDieInfo.name;
+	  aUnit->low_pc = aDieInfo.low_pc;
+	  aUnit->high_pc = aDieInfo.high_pc;
+	  aUnit->has_stmt_list = aDieInfo.has_stmt_list;
+	  aUnit->stmt_list_offset = aDieInfo.stmt_list_offset;
+	  
+	  /* A die has a child if it's followed by a die that is
+	     not it's sibling. */
+	  if (aDieInfo.sibling 
+	      && stash->currentDie + aDieInfo.length 
+                    < stash->debug_section_end
+	      && stash->currentDie + aDieInfo.length 
+	            != stash->debug_section + aDieInfo.sibling)
+	    aUnit->first_child = stash->currentDie + aDieInfo.length;
+	  else
+	    aUnit->first_child = 0;
+
+	  if (aUnit->low_pc <= addr && addr < aUnit->high_pc)
+	    return dwarf1_unit_find_nearest_line (stash, aUnit, addr, 
+						  filename_ptr, 
+						  functionname_ptr, 
+						  linenumber_ptr);
+	}
+      
+      if (aDieInfo.sibling != 0)
+	stash->currentDie = stash->debug_section + aDieInfo.sibling;
+      else
+	stash->currentDie += aDieInfo.length;
+    }
+
+  return false;
+}
+
+
+/* EOF */