Initial revision

1 files changed, 632 insertions, 0 deletions

diff --git a/gas/stabs.c b/gas/stabs.c
new file mode 100644
index 0000000000..db7e1bfb6d
--- /dev/null
+++ b/gas/stabs.c
@@ -0,0 +1,632 @@
+/* Generic stabs parsing for gas.
+   Copyright (C) 1989, 90, 91, 93, 94, 95, 96, 97, 1998
+   Free Software Foundation, Inc.
+
+This file is part of GAS, the GNU Assembler.
+
+GAS 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,
+or (at your option) any later version.
+
+GAS 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 GAS; see the file COPYING.  If not, write to the Free
+Software Foundation, 59 Temple Place - Suite 330, Boston, MA
+02111-1307, USA. */
+
+#include "as.h"
+#include "obstack.h"
+#include "subsegs.h"
+#include "ecoff.h"
+
+/* We need this, despite the apparent object format dependency, since
+   it defines stab types, which all object formats can use now. */
+
+#include "aout/stab_gnu.h"
+
+static void s_stab_generic PARAMS ((int, char *, char *));
+static void generate_asm_file PARAMS ((int, char *));
+
+/* Allow backends to override the names used for the stab sections.  */
+#ifndef STAB_SECTION_NAME
+#define STAB_SECTION_NAME ".stab"
+#endif
+
+#ifndef STAB_STRING_SECTION_NAME
+#define STAB_STRING_SECTION_NAME ".stabstr"
+#endif
+
+/* Non-zero if we're in the middle of a .func function, in which case
+   stabs_generate_asm_lineno emits function relative line number stabs.
+   Otherwise it emits line number stabs with absolute addresses.  Note that
+   both cases only apply to assembler code assembled with -gstabs.  */
+static int in_dot_func_p;
+
+/* Label at start of current function if in_dot_func_p != 0.  */
+static const char *current_function_label;
+
+/*
+ * Handle .stabX directives, which used to be open-coded.
+ * So much creeping featurism overloaded the semantics that we decided
+ * to put all .stabX thinking in one place. Here.
+ *
+ * We try to make any .stabX directive legal. Other people's AS will often
+ * do assembly-time consistency checks: eg assigning meaning to n_type bits
+ * and "protecting" you from setting them to certain values. (They also zero
+ * certain bits before emitting symbols. Tut tut.)
+ *
+ * If an expression is not absolute we either gripe or use the relocation
+ * information. Other people's assemblers silently forget information they
+ * don't need and invent information they need that you didn't supply.
+ */
+
+/*
+ * Build a string dictionary entry for a .stabX symbol.
+ * The symbol is added to the .<secname>str section.
+ */
+
+#ifndef SEPARATE_STAB_SECTIONS
+#define SEPARATE_STAB_SECTIONS 0
+#endif
+
+unsigned int
+get_stab_string_offset (string, stabstr_secname)
+     const char *string;
+     const char *stabstr_secname;
+{
+  unsigned int length;
+  unsigned int retval;
+  segT save_seg;
+  subsegT save_subseg;
+  segT seg;
+  char *p;
+
+  if (! SEPARATE_STAB_SECTIONS)
+    abort ();
+
+  length = strlen (string);
+
+  save_seg = now_seg;
+  save_subseg = now_subseg;
+
+  /* Create the stab string section.  */
+  seg = subseg_new (stabstr_secname, 0);
+
+  retval = seg_info (seg)->stabu.stab_string_size;
+  if (retval <= 0)
+    {
+      /* Make sure the first string is empty.  */
+      p = frag_more (1);
+      *p = 0;
+      retval = seg_info (seg)->stabu.stab_string_size = 1;
+#ifdef BFD_ASSEMBLER
+      bfd_set_section_flags (stdoutput, seg, SEC_READONLY | SEC_DEBUGGING);
+      if (seg->name == stabstr_secname)
+	seg->name = xstrdup (stabstr_secname);
+#endif
+    }
+
+  if (length > 0)
+    {				/* Ordinary case. */
+      p = frag_more (length + 1);
+      strcpy (p, string);
+
+      seg_info (seg)->stabu.stab_string_size += length + 1;
+    }
+  else
+    retval = 0;
+
+  subseg_set (save_seg, save_subseg);
+
+  return retval;
+}
+
+#ifdef AOUT_STABS
+#ifndef OBJ_PROCESS_STAB
+#define OBJ_PROCESS_STAB(SEG,W,S,T,O,D)	aout_process_stab(W,S,T,O,D)
+#endif
+
+static void aout_process_stab PARAMS ((int, const char *, int, int, int));
+
+static void
+aout_process_stab (what, string, type, other, desc)
+     int what;
+     const char *string;
+     int type, other, desc;
+{
+  /* Put the stab information in the symbol table.  */
+  symbolS *symbol;
+
+  /* Create the symbol now, but only insert it into the symbol chain
+     after any symbols mentioned in the value expression get into the
+     symbol chain.  This is to avoid "continuation symbols" (where one
+     ends in "\" and the debug info is continued in the next .stabs
+     directive) from being separated by other random symbols.  */
+  symbol = symbol_create (string, undefined_section, 0,
+			  (struct frag *) NULL);
+  if (what == 's' || what == 'n')
+    {
+      /* Pick up the value from the input line.  */
+      symbol->sy_frag = &zero_address_frag;
+      pseudo_set (symbol);
+    }
+  else
+    {
+      /* .stabd sets the name to NULL.  Why?  */
+      S_SET_NAME (symbol, NULL);
+      symbol->sy_frag = frag_now;
+      S_SET_VALUE (symbol, (valueT) frag_now_fix ());
+    }
+
+  symbol_append (symbol, symbol_lastP, &symbol_rootP, &symbol_lastP);
+
+  S_SET_TYPE (symbol, type);
+  S_SET_OTHER (symbol, other);
+  S_SET_DESC (symbol, desc);
+}
+#endif
+
+/* This can handle different kinds of stabs (s,n,d) and different
+   kinds of stab sections. */
+
+static void 
+s_stab_generic (what, stab_secname, stabstr_secname)
+     int what;
+     char *stab_secname;
+     char *stabstr_secname;
+{
+  long longint;
+  char *string;
+  int type;
+  int other;
+  int desc;
+
+  /* The general format is:
+     .stabs "STRING",TYPE,OTHER,DESC,VALUE
+     .stabn TYPE,OTHER,DESC,VALUE
+     .stabd TYPE,OTHER,DESC
+     At this point input_line_pointer points after the pseudo-op and
+     any trailing whitespace.  The argument what is one of 's', 'n' or
+     'd' indicating which type of .stab this is.  */
+
+  if (what != 's')
+    string = "";
+  else
+    {
+      int length;
+
+      string = demand_copy_C_string (&length);
+      SKIP_WHITESPACE ();
+      if (*input_line_pointer == ',')
+	input_line_pointer++;
+      else
+	{
+	  as_warn (_(".stabs: Missing comma"));
+	  ignore_rest_of_line ();
+	  return;
+	}
+    }
+
+  if (get_absolute_expression_and_terminator (&longint) != ',')
+    {
+      as_warn (_(".stab%c: Missing comma"), what);
+      ignore_rest_of_line ();
+      return;
+    }
+  type = longint;
+
+  if (get_absolute_expression_and_terminator (&longint) != ',')
+    {
+      as_warn (_(".stab%c: Missing comma"), what);
+      ignore_rest_of_line ();
+      return;
+    }
+  other = longint;
+
+  desc = get_absolute_expression ();
+  if (what == 's' || what == 'n')
+    {
+      if (*input_line_pointer != ',')
+	{
+	  as_warn (_(".stab%c: Missing comma"), what);
+	  ignore_rest_of_line ();
+	  return;
+	}
+      input_line_pointer++;
+      SKIP_WHITESPACE ();
+    }
+
+#ifdef TC_PPC
+#ifdef OBJ_ELF
+  /* Solaris on PowerPC has decided that .stabd can take 4 arguments, so if we were
+     given 4 arguments, make it a .stabn */
+  else if (what == 'd')
+    {
+      char *save_location = input_line_pointer;
+
+      SKIP_WHITESPACE ();
+      if (*input_line_pointer == ',')
+	{
+	  input_line_pointer++;
+	  what = 'n';
+	}
+      else
+	input_line_pointer = save_location;
+    }
+#endif /* OBJ_ELF */
+#endif /* TC_PPC */
+
+#ifndef NO_LISTING
+  if (listing)
+    {
+      switch (type)
+	{
+	case N_SLINE:
+	  listing_source_line ((unsigned int) desc);
+	  break;
+	case N_SO:
+	case N_SOL:
+	  listing_source_file (string);
+	  break;
+	}
+    }
+#endif /* ! NO_LISTING */
+
+  /* We have now gathered the type, other, and desc information.  For
+     .stabs or .stabn, input_line_pointer is now pointing at the
+     value.  */
+
+  if (SEPARATE_STAB_SECTIONS)
+    /* Output the stab information in a separate section.  This is used
+       at least for COFF and ELF.  */
+    {
+      segT saved_seg = now_seg;
+      subsegT saved_subseg = now_subseg;
+      fragS *saved_frag = frag_now;
+      valueT dot;
+      segT seg;
+      unsigned int stroff;
+      char *p;
+
+      static segT cached_sec;
+      static char *cached_secname;
+
+      dot = frag_now_fix ();
+
+#ifdef md_flush_pending_output
+      md_flush_pending_output ();
+#endif
+
+      if (cached_secname && !strcmp (cached_secname, stab_secname))
+	{
+	  seg = cached_sec;
+	  subseg_set (seg, 0);
+	}
+      else
+	{
+	  seg = subseg_new (stab_secname, 0);
+	  if (cached_secname)
+	    free (cached_secname);
+	  cached_secname = xstrdup (stab_secname);
+	  cached_sec = seg;
+	}
+
+      if (! seg_info (seg)->hadone)
+	{
+#ifdef BFD_ASSEMBLER
+	  bfd_set_section_flags (stdoutput, seg,
+				 SEC_READONLY | SEC_RELOC | SEC_DEBUGGING);
+#endif
+#ifdef INIT_STAB_SECTION
+	  INIT_STAB_SECTION (seg);
+#endif
+	  seg_info (seg)->hadone = 1;
+	}
+
+      stroff = get_stab_string_offset (string, stabstr_secname);
+      if (what == 's')
+	{
+	  /* release the string */
+	  obstack_free (&notes, string);
+	}
+
+      /* At least for now, stabs in a special stab section are always
+	 output as 12 byte blocks of information.  */
+      p = frag_more (8);
+      md_number_to_chars (p, (valueT) stroff, 4);
+      md_number_to_chars (p + 4, (valueT) type, 1);
+      md_number_to_chars (p + 5, (valueT) other, 1);
+      md_number_to_chars (p + 6, (valueT) desc, 2);
+
+      if (what == 's' || what == 'n')
+	{
+	  /* Pick up the value from the input line.  */
+	  cons (4);
+	  input_line_pointer--;
+	}
+      else
+	{
+	  const char *fake;
+	  symbolS *symbol;
+	  expressionS exp;
+
+	  /* Arrange for a value representing the current location.  */
+	  fake = FAKE_LABEL_NAME;
+	  symbol = symbol_new (fake, saved_seg, dot, saved_frag);
+
+	  exp.X_op = O_symbol;
+	  exp.X_add_symbol = symbol;
+	  exp.X_add_number = 0;
+
+	  emit_expr (&exp, 4);
+	}
+
+#ifdef OBJ_PROCESS_STAB
+      OBJ_PROCESS_STAB (seg, what, string, type, other, desc);
+#endif
+
+      subseg_set (saved_seg, saved_subseg);
+    }
+  else
+    {
+#ifdef OBJ_PROCESS_STAB
+      OBJ_PROCESS_STAB (0, what, string, type, other, desc);
+#else
+      abort ();
+#endif
+    }
+
+  demand_empty_rest_of_line ();
+}
+
+/* Regular stab directive. */
+
+void
+s_stab (what)
+     int what;
+{
+  s_stab_generic (what, STAB_SECTION_NAME, STAB_STRING_SECTION_NAME);
+}
+
+/* "Extended stabs", used in Solaris only now. */
+
+void
+s_xstab (what)
+     int what;
+{
+  int length;
+  char *stab_secname, *stabstr_secname;
+  static char *saved_secname, *saved_strsecname;
+
+  /* @@ MEMORY LEAK: This allocates a copy of the string, but in most
+     cases it will be the same string, so we could release the storage
+     back to the obstack it came from.  */
+  stab_secname = demand_copy_C_string (&length);
+  SKIP_WHITESPACE ();
+  if (*input_line_pointer == ',')
+    input_line_pointer++;
+  else
+    {
+      as_bad (_("comma missing in .xstabs"));
+      ignore_rest_of_line ();
+      return;
+    }
+
+  /* To get the name of the stab string section, simply add "str" to
+     the stab section name.  */
+  if (saved_secname == 0 || strcmp (saved_secname, stab_secname))
+    {
+      stabstr_secname = (char *) xmalloc (strlen (stab_secname) + 4);
+      strcpy (stabstr_secname, stab_secname);
+      strcat (stabstr_secname, "str");
+      if (saved_secname)
+	{
+	  free (saved_secname);
+	  free (saved_strsecname);
+	}
+      saved_secname = stab_secname;
+      saved_strsecname = stabstr_secname;
+    }
+  s_stab_generic (what, saved_secname, saved_strsecname);
+}
+
+#ifdef S_SET_DESC
+
+/* Frob invented at RMS' request. Set the n_desc of a symbol.  */
+
+void 
+s_desc (ignore)
+     int ignore;
+{
+  char *name;
+  char c;
+  char *p;
+  symbolS *symbolP;
+  int temp;
+
+  name = input_line_pointer;
+  c = get_symbol_end ();
+  p = input_line_pointer;
+  *p = c;
+  SKIP_WHITESPACE ();
+  if (*input_line_pointer != ',')
+    {
+      *p = 0;
+      as_bad (_("Expected comma after name \"%s\""), name);
+      *p = c;
+      ignore_rest_of_line ();
+    }
+  else
+    {
+      input_line_pointer++;
+      temp = get_absolute_expression ();
+      *p = 0;
+      symbolP = symbol_find_or_make (name);
+      *p = c;
+      S_SET_DESC (symbolP, temp);
+    }
+  demand_empty_rest_of_line ();
+}				/* s_desc() */
+
+#endif /* defined (S_SET_DESC) */
+
+/* Generate stabs debugging information to denote the main source file.  */
+
+void
+stabs_generate_asm_file ()
+{
+  char *file;
+  unsigned int lineno;
+
+  as_where (&file, &lineno);
+  generate_asm_file (N_SO, file);
+}
+
+/* Generate stabs debugging information to denote the source file.
+   TYPE is one of N_SO, N_SOL.  */
+
+static void
+generate_asm_file (type, file)
+     int type;
+     char *file;
+{
+  static char *last_file;
+  static int label_count;
+  char *hold;
+  char buf[100];
+  char sym[30];
+
+  /* Rather than try to do this in some efficient fashion, we just
+     generate a string and then parse it again.  That lets us use the
+     existing stabs hook, which expect to see a string, rather than
+     inventing new ones.  */
+
+  hold = input_line_pointer;
+
+  if (last_file == NULL
+      || strcmp (last_file, file) != 0)
+    {
+      sprintf (sym, "%sF%d", FAKE_LABEL_NAME, label_count);
+      ++label_count;
+
+      sprintf (buf, "\"%s\",%d,0,0,%s\n", file, type, sym);
+      input_line_pointer = buf;
+      s_stab ('s');
+      colon (sym);
+
+      if (last_file != NULL)
+	free (last_file);
+      last_file = xstrdup (file);
+    }
+
+  input_line_pointer = hold;
+}
+
+/* Generate stabs debugging information for the current line.  This is
+   used to produce debugging information for an assembler file.  */
+
+void
+stabs_generate_asm_lineno ()
+{
+  static int label_count;
+  char *hold;
+  char *file;
+  unsigned int lineno;
+  char *buf;
+  char sym[30];
+
+  /* Rather than try to do this in some efficient fashion, we just
+     generate a string and then parse it again.  That lets us use the
+     existing stabs hook, which expect to see a string, rather than
+     inventing new ones.  */
+
+  hold = input_line_pointer;
+
+  as_where (&file, &lineno);
+
+  generate_asm_file (N_SOL, file);
+
+  sprintf (sym, "%sL%d", FAKE_LABEL_NAME, label_count);
+  ++label_count;
+
+  if (in_dot_func_p)
+    {
+      buf = (char *) alloca (100 + strlen (current_function_label));
+      sprintf (buf, "%d,0,%d,%s-%s\n", N_SLINE, lineno,
+	       sym, current_function_label);
+    }
+  else
+    {
+      buf = (char *) alloca (100);
+      sprintf (buf, "%d,0,%d,%s\n", N_SLINE, lineno, sym);
+    }
+  input_line_pointer = buf;
+  s_stab ('n');
+  colon (sym);
+
+  input_line_pointer = hold;
+}
+
+/* Emit a function stab.
+   All assembler functions are assumed to have return type `void'.  */
+
+void
+stabs_generate_asm_func (funcname, startlabname)
+     const char *funcname;
+     const char *startlabname;
+{
+  static int void_emitted_p;
+  char *hold = input_line_pointer;
+  char *buf;
+  char *file;
+  unsigned int lineno;
+
+  if (! void_emitted_p)
+    {
+      input_line_pointer = "\"void:t1=1\",128,0,0,0";
+      s_stab ('s');
+      void_emitted_p = 1;
+    }
+
+  as_where (&file, &lineno);
+  asprintf (&buf, "\"%s:F1\",%d,0,%d,%s",
+	    funcname, N_FUN, lineno + 1, startlabname);
+  input_line_pointer = buf;
+  s_stab ('s');
+  free (buf);
+
+  input_line_pointer = hold;
+  current_function_label = xstrdup (startlabname);
+  in_dot_func_p = 1;
+}
+
+/* Emit a stab to record the end of a function.  */
+
+void
+stabs_generate_asm_endfunc (funcname, startlabname)
+     const char *funcname;
+     const char *startlabname;
+{
+  static int label_count;
+  char *hold = input_line_pointer;
+  char *buf;
+  char sym[30];
+
+  sprintf (sym, "%sendfunc%d", FAKE_LABEL_NAME, label_count);
+  ++label_count;
+  colon (sym);
+
+  asprintf (&buf, "\"\",%d,0,0,%s-%s", N_FUN, sym, startlabname);
+  input_line_pointer = buf;
+  s_stab ('s');
+  free (buf);
+
+  input_line_pointer = hold;
+  in_dot_func_p = 0;
+  current_function_label = NULL;
+}