install EH code

From-SVN: r12549

gcc/function.h

@@ -127,6 +127,14 @@ struct function
   int emit_lineno;
   struct goto_fixup *goto_fixup_chain;
 
+  /* For exception handling information.  */
+  struct eh_stack ehstack;
+  struct eh_queue ehqueue;
+  rtx catch_clauses;
+  struct label_node *false_label_stack;
+  struct label_node *caught_return_label_stack;
+  tree protect_list;
+
   /* For expr.c.  */
   int pending_stack_adjust;
   int inhibit_defer_pop;

gcc/integrate.c

@@ -33,6 +33,7 @@ Boston, MA 02111-1307, USA.  */
 #include "output.h"
 #include "integrate.h"
 #include "real.h"
+#include "except.h"
 #include "function.h"
 #include "bytecode.h"
 
@@ -170,6 +171,19 @@ function_cannot_inline_p (fndecl)
   if (current_function_has_nonlocal_goto)
     return "function with nonlocal goto cannot be inline";
 
+  /* This is a hack, until the inliner is taught about eh regions at
+     the start of the function.  */
+  for (insn = get_insns ();
+       insn &&
+         ! (GET_CODE (insn) == NOTE
+	    && NOTE_LINE_NUMBER (insn) == NOTE_INSN_FUNCTION_BEG);
+       insn = NEXT_INSN (insn))
+    {
+      if (insn && GET_CODE (insn) == NOTE
+	  && NOTE_LINE_NUMBER (insn) == NOTE_INSN_EH_REGION_BEG)
+	return "function with complex parameters cannot be inline";
+    }
+
   return 0;
 }
 
@@ -309,6 +323,7 @@ initialize_for_inline (fndecl, min_labelno, max_labelno, max_reg, copy)
      the size of the incoming stack area for parameters,
      the number of bytes popped on return,
      the stack slot list,
+     the labels that are forced to exist,
      some flags that are used to restore compiler globals,
      the value of current_function_outgoing_args_size,
      the original argument vector,
@@ -335,7 +350,7 @@ finish_inline (fndecl, head)
      tree fndecl;
      rtx head;
 {
-  NEXT_INSN (head) = get_first_nonparm_insn ();
+  FIRST_FUNCTION_INSN (head) = get_first_nonparm_insn ();
   FIRST_PARM_INSN (head) = get_insns ();
   DECL_SAVED_INSNS (fndecl) = head;
   DECL_FRAME_SIZE (fndecl) = get_frame_size ();
@@ -565,6 +580,15 @@ save_for_inline_copying (fndecl)
 	      NOTE_SOURCE_FILE (insn) = (char *) copy;
 	      NOTE_SOURCE_FILE (copy) = 0;
 	    }
+	  if (NOTE_LINE_NUMBER (copy) == NOTE_INSN_EH_REGION_BEG
+	      || NOTE_LINE_NUMBER (copy) == NOTE_INSN_EH_REGION_END)
+	    {
+	      /* We have to forward these both to match the new exception
+		 region.  */
+	      NOTE_BLOCK_NUMBER (copy)
+		= CODE_LABEL_NUMBER (label_map[NOTE_BLOCK_NUMBER (copy)]);
+	      
+	    }
 	  RTX_INTEGRATED_P (copy) = RTX_INTEGRATED_P (insn);
 	  break;
 
@@ -1872,7 +1896,18 @@ expand_inline_function (fndecl, parms, target, ignore, type,
 	  if (NOTE_LINE_NUMBER (insn) != NOTE_INSN_FUNCTION_END
 	      && NOTE_LINE_NUMBER (insn) != NOTE_INSN_FUNCTION_BEG
 	      && NOTE_LINE_NUMBER (insn) != NOTE_INSN_DELETED)
-	    copy = emit_note (NOTE_SOURCE_FILE (insn), NOTE_LINE_NUMBER (insn));
+	    {
+	      copy = emit_note (NOTE_SOURCE_FILE (insn), NOTE_LINE_NUMBER (insn));
+	      if (copy && (NOTE_LINE_NUMBER (copy) == NOTE_INSN_EH_REGION_BEG
+			   || NOTE_LINE_NUMBER (copy) == NOTE_INSN_EH_REGION_END))
+		{
+		  rtx label = map->label_map[NOTE_BLOCK_NUMBER (copy)];
+
+		  /* We have to forward these both to match the new exception
+		     region.  */
+		  NOTE_BLOCK_NUMBER (copy) = CODE_LABEL_NUMBER (label);
+		}
+	    }
 	  else
 	    copy = 0;
 	  break;

gcc/jump.c

@@ -60,6 +60,7 @@ Boston, MA 02111-1307, USA.  */
 #include "insn-flags.h"
 #include "expr.h"
 #include "real.h"
+#include "except.h"
 
 /* ??? Eventually must record somehow the labels used by jumps
    from nested functions.  */
@@ -234,6 +235,16 @@ jump_optimize (f, cross_jump, noop_moves, after_regscan)
   for (insn = forced_labels; insn; insn = XEXP (insn, 1))
     LABEL_NUSES (XEXP (insn, 0))++;
 
+  check_exception_handler_labels ();
+
+  /* Keep track of labels used for marking handlers for exception
+     regions; they cannot usually be deleted.  */
+
+  for (insn = exception_handler_labels; insn; insn = XEXP (insn, 1))
+    LABEL_NUSES (XEXP (insn, 0))++;
+
+  exception_optimize ();
+
   /* Delete all labels already not referenced.
      Also find the last insn.  */
 

gcc/libgcc2.c

@@ -2989,6 +2989,13 @@ int _exit_dummy_decl = 0;	/* prevent compiler & linker warnings */
 #endif /* L_exit */
 
 #ifdef L_eh
+
+#ifdef EH_TABLE_LOOKUP
+
+EH_TABLE_LOOKUP
+
+#else
+
 typedef struct {
   void *start;
   void *end;
@@ -3095,21 +3102,9 @@ void *pc;
 #endif
 
 #if 0
-  printf("find_first_eh_table_match(): else: returning NULL!\n");
-#endif
-  return (void*)0;
-}
-
-void *
-__throw_type_match (void *catch_type, void *throw_type, void* obj)
-{
-#if 0
- printf("__throw_type_match (): catch_type = %s, throw_type = %s\n",
-	catch_type, throw_type);
+  printf ("find_first_eh_table_match(): else: returning NULL!\n");
 #endif
- if (strcmp ((const char *)catch_type, (const char *)throw_type) == 0)
-   return obj;
- return 0;
+  return (void *) 0;
 }
 
 void
@@ -3140,6 +3135,19 @@ __register_exceptions (exception_table *table)
   node->next = exception_table_list;
   exception_table_list = node;
 }
+#endif
+
+void *
+__throw_type_match (void *catch_type, void *throw_type, void *obj)
+{
+#if 0
+ printf ("__throw_type_match (): catch_type = %s, throw_type = %s\n",
+	 catch_type, throw_type);
+#endif
+ if (strcmp ((const char *)catch_type, (const char *)throw_type) == 0)
+   return obj;
+ return 0;
+}
 
 void
 __empty ()

gcc/loop.c

@@ -47,6 +47,7 @@ Boston, MA 02111-1307, USA.  */
 #include "flags.h"
 #include "real.h"
 #include "loop.h"
+#include "except.h"
 
 /* Vector mapping INSN_UIDs to luids.
    The luids are like uids but increase monotonically always.
@@ -2290,6 +2291,19 @@ find_and_verify_loops (f)
 	loop_invalid[loop_num] = 1;
     }
 
+  /* Any loop containing a label used for an exception handler must be
+     invalidated, because it can be jumped into from anywhere.  */
+
+  for (label = exception_handler_labels; label; label = XEXP (label, 1))
+    {
+      int loop_num;
+
+      for (loop_num = uid_loop_num[INSN_UID (XEXP (label, 0))];
+	   loop_num != -1;
+	   loop_num = loop_outer_loop[loop_num])
+	loop_invalid[loop_num] = 1;
+    }
+
   /* Now scan all insn's in the function.  If any JUMP_INSN branches into a
      loop that it is not contained within, that loop is marked invalid.
      If any INSN or CALL_INSN uses a label's address, then the loop containing

gcc/optabs.c

@@ -118,6 +118,8 @@ rtx bcmp_libfunc;
 rtx memset_libfunc;
 rtx bzero_libfunc;
 
+rtx throw_libfunc;
+
 rtx eqhf2_libfunc;
 rtx nehf2_libfunc;
 rtx gthf2_libfunc;
@@ -4247,6 +4249,8 @@ init_optabs ()
   memset_libfunc = gen_rtx (SYMBOL_REF, Pmode, "memset");
   bzero_libfunc = gen_rtx (SYMBOL_REF, Pmode, "bzero");
 
+  throw_libfunc = gen_rtx (SYMBOL_REF, Pmode, "__throw");
+
   eqhf2_libfunc = gen_rtx (SYMBOL_REF, Pmode, "__eqhf2");
   nehf2_libfunc = gen_rtx (SYMBOL_REF, Pmode, "__nehf2");
   gthf2_libfunc = gen_rtx (SYMBOL_REF, Pmode, "__gthf2");

gcc/output.h

@@ -140,6 +140,9 @@ extern void named_section		PROTO((tree, char *));
 /* Tell assembler to switch to the section for function DECL.  */
 extern void function_section		PROTO((tree));
 
+/* Tell assembler to switch to the section for the exception table.  */
+extern void exception_section		PROTO((void));
+
 /* Create the rtl to represent a function, for a function definition.
    DECL is a FUNCTION_DECL node which describes which function.
    The rtl is stored into DECL.  */

gcc/print-rtl.c

@@ -108,6 +108,14 @@ print_rtx (in_rtx)
       {
       case 'S':
       case 's':
+	if (i == 3 && GET_CODE (in_rtx) == NOTE
+	    && (NOTE_LINE_NUMBER (in_rtx) == NOTE_INSN_EH_REGION_BEG
+		|| NOTE_LINE_NUMBER (in_rtx) == NOTE_INSN_EH_REGION_END))
+	  {
+	    fprintf (outfile, " %d", NOTE_BLOCK_NUMBER (in_rtx));
+	    sawclose = 1;
+	    break;
+	  }
 	if (XSTR (in_rtx, i) == 0)
 	  fprintf (outfile, " \"\"");
 	else

gcc/sched.c

@@ -111,9 +111,11 @@ Boston, MA 02111-1307, USA.  */
    reg_n_calls_crossed, and reg_live_length.  Also, basic_block_head,
    basic_block_end.
 
-   The information in the line number notes is carefully retained by this
-   pass.  All other NOTE insns are grouped in their same relative order at
-   the beginning of basic blocks that have been scheduled.  */
+   The information in the line number notes is carefully retained by
+   this pass.  Notes that refer to the starting and ending of
+   exception regions are also carefully retained by this pass.  All
+   other NOTE insns are grouped in their same relative order at the
+   beginning of basic blocks that have been scheduled.  */
 
 #include <stdio.h>
 #include "config.h"
@@ -2078,7 +2080,7 @@ sched_analyze_insn (x, insn, loop_notes)
 	  sched_analyze_2 (XEXP (link, 0), insn);
       }
 
-  /* If there is a LOOP_{BEG,END} note in the middle of a basic block, then
+  /* If there is a {LOOP,EHREGION}_{BEG,END} note in the middle of a basic block, then
      we must be sure that no instructions are scheduled across it.
      Otherwise, the reg_n_refs info (which depends on loop_depth) would
      become incorrect.  */
@@ -2240,8 +2242,13 @@ sched_analyze (head, tail)
 		}
 	      reg_pending_sets_all = 1;
 
-	      /* Add a fake REG_NOTE which we will later convert
-		 back into a NOTE_INSN_SETJMP note.  */
+	      /* Add a pair of fake REG_NOTEs which we will later
+		 convert back into a NOTE_INSN_SETJMP note.  See
+		 reemit_notes for why we use a pair of of NOTEs.  */
+
+	      REG_NOTES (insn) = gen_rtx (EXPR_LIST, REG_DEAD,
+					  GEN_INT (0),
+					  REG_NOTES (insn));
 	      REG_NOTES (insn) = gen_rtx (EXPR_LIST, REG_DEAD,
 					  GEN_INT (NOTE_INSN_SETJMP),
 					  REG_NOTES (insn));
@@ -2285,13 +2292,19 @@ sched_analyze (head, tail)
 	  last_function_call = insn;
 	  n_insns += 1;
 	}
+
+      /* See comments on reemit_notes as to why we do this.  */
       else if (GET_CODE (insn) == NOTE
 	       && (NOTE_LINE_NUMBER (insn) == NOTE_INSN_LOOP_BEG
 		   || NOTE_LINE_NUMBER (insn) == NOTE_INSN_LOOP_END
+		   || NOTE_LINE_NUMBER (insn) == NOTE_INSN_EH_REGION_BEG
+		   || NOTE_LINE_NUMBER (insn) == NOTE_INSN_EH_REGION_END
 		   || (NOTE_LINE_NUMBER (insn) == NOTE_INSN_SETJMP
 		       && GET_CODE (PREV_INSN (insn)) != CALL_INSN)))
 	{
 	  loop_notes = gen_rtx (EXPR_LIST, REG_DEAD,
+				GEN_INT (NOTE_BLOCK_NUMBER (insn)), loop_notes);
+	  loop_notes = gen_rtx (EXPR_LIST, REG_DEAD,
 				GEN_INT (NOTE_LINE_NUMBER (insn)), loop_notes);
 	  CONST_CALL_P (loop_notes) = CONST_CALL_P (insn);
 	}
@@ -3077,10 +3090,12 @@ unlink_notes (insn, tail)
       /* Don't save away NOTE_INSN_SETJMPs, because they must remain
 	 immediately after the call they follow.  We use a fake
 	 (REG_DEAD (const_int -1)) note to remember them.
-	 Likewise with NOTE_INSN_LOOP_BEG and NOTE_INSN_LOOP_END.  */
+	 Likewise with NOTE_INSN_{LOOP,EHREGION}_{BEG, END}.  */
       else if (NOTE_LINE_NUMBER (insn) != NOTE_INSN_SETJMP
 	       && NOTE_LINE_NUMBER (insn) != NOTE_INSN_LOOP_BEG
-	       && NOTE_LINE_NUMBER (insn) != NOTE_INSN_LOOP_END)
+	       && NOTE_LINE_NUMBER (insn) != NOTE_INSN_LOOP_END
+	       && NOTE_LINE_NUMBER (insn) != NOTE_INSN_EH_REGION_BEG
+	       && NOTE_LINE_NUMBER (insn) != NOTE_INSN_EH_REGION_END)
 	{
 	  /* Insert the note at the end of the notes list.  */
 	  PREV_INSN (insn) = note_list;
@@ -3143,10 +3158,12 @@ finish_sometimes_live (regs_sometimes_live, sometimes_max)
     }
 }
 
-/* Search INSN for fake REG_DEAD notes for NOTE_INSN_SETJMP,
-   NOTE_INSN_LOOP_BEG, and NOTE_INSN_LOOP_END; and convert them back
-   into NOTEs.  LAST is the last instruction output by the instruction
-   scheduler.  Return the new value of LAST.  */
+/* Search INSN for fake REG_DEAD note pairs for NOTE_INSN_SETJMP,
+   NOTE_INSN_{LOOP,EHREGION}_{BEG,END}; and convert them back into
+   NOTEs.  The REG_DEAD note following first one is contains the saved
+   value for NOTE_BLOCK_NUMBER which is useful for
+   NOTE_INSN_EH_REGION_{BEG,END} NOTEs.  LAST is the last instruction
+   output by the instruction scheduler.  Return the new value of LAST.  */
 
 static rtx
 reemit_notes (insn, last)
@@ -3161,10 +3178,19 @@ reemit_notes (insn, last)
 	  && GET_CODE (XEXP (note, 0)) == CONST_INT)
 	{
 	  if (INTVAL (XEXP (note, 0)) == NOTE_INSN_SETJMP)
-	    CONST_CALL_P (emit_note_after (INTVAL (XEXP (note, 0)), insn))
-	      = CONST_CALL_P (note);
+	    {
+	      CONST_CALL_P (emit_note_after (INTVAL (XEXP (note, 0)), insn))
+		= CONST_CALL_P (note);
+	      remove_note (insn, note);
+	      note = XEXP (note, 1);
+	    }
 	  else
-	    last = emit_note_before (INTVAL (XEXP (note, 0)), last);
+	    {
+	      last = emit_note_before (INTVAL (XEXP (note, 0)), last);
+	      remove_note (insn, note);
+	      note = XEXP (note, 1);
+	      NOTE_BLOCK_NUMBER (last) = INTVAL (XEXP (note, 0));
+	    }
 	  remove_note (insn, note);
 	}
     }
@@ -3961,8 +3987,8 @@ schedule_block (b, file)
 	    }
 	}
 
-      /* Put back NOTE_INSN_SETJMP, NOTE_INSN_LOOP_BEGIN, and
-	 NOTE_INSN_LOOP_END notes.  */
+      /* Put back NOTE_INSN_SETJMP,
+         NOTE_INSN_{LOOP,EHREGION}_{BEGIN,END} notes.  */
 
       /* To prime the loop.  We need to handle INSN and all the insns in the
          sched group.  */

gcc/stmt.c

@@ -41,6 +41,7 @@ Boston, MA 02111-1307, USA.  */
 #include "rtl.h"
 #include "tree.h"
 #include "flags.h"
+#include "except.h"
 #include "function.h"
 #include "insn-flags.h"
 #include "insn-config.h"
@@ -134,8 +135,6 @@ extern tree rtl_expr_chain;
    cleanup list whenever an empty list is required.  */
 static tree empty_cleanup_list;
 #endif
-
-extern void (*interim_eh_hook)	PROTO((tree));
 
 /* Functions and data structures for expanding case statements.  */
 
@@ -473,9 +472,7 @@ void
 init_stmt ()
 {
   gcc_obstack_init (&stmt_obstack);
-#if 0
-  empty_cleanup_list = build_tree_list (NULL_TREE, NULL_TREE);
-#endif
+  init_eh ();
 }
 
 void
@@ -498,6 +495,8 @@ init_stmt_for_function ()
   /* We are not processing a ({...}) grouping.  */
   expr_stmts_for_value = 0;
   last_expr_type = 0;
+
+  init_eh_for_function ();
 }
 
 void
@@ -518,6 +517,7 @@ save_stmt_status (p)
   p->emit_filename = emit_filename;
   p->emit_lineno = emit_lineno;
   p->goto_fixup_chain = goto_fixup_chain;
+  save_eh_status (p);
 }
 
 void
@@ -538,6 +538,7 @@ restore_stmt_status (p)
   emit_filename = p->emit_filename;
   emit_lineno = p->emit_lineno;
   goto_fixup_chain = p->goto_fixup_chain;
+  restore_eh_status (p);
 }
 
 /* Emit a no-op instruction.  */
@@ -3730,7 +3731,7 @@ expand_decl_cleanup (decl, cleanup)
 	= temp_tree_cons (decl, cleanup, thisblock->data.block.cleanups);
       /* If this block has a cleanup, it belongs in stack_block_stack.  */
       stack_block_stack = thisblock;
-      (*interim_eh_hook) (NULL_TREE);
+      expand_eh_region_start ();
     }
   return 1;
 }
@@ -3831,7 +3832,7 @@ expand_cleanups (list, dont_do, in_fixup, reachable)
 	else
 	  {
 	    if (! in_fixup)
-	      (*interim_eh_hook) (TREE_VALUE (tail));
+	      expand_eh_region_end (TREE_VALUE (tail));
 
 	    if (reachable)
 	      {

gcc/varasm.c

@@ -33,6 +33,7 @@ Boston, MA 02111-1307, USA.  */
 #include "rtl.h"
 #include "tree.h"
 #include "flags.h"
+#include "except.h"
 #include "function.h"
 #include "expr.h"
 #include "output.h"
@@ -414,6 +415,26 @@ variable_section (decl, reloc)
 #endif
     }
 }
+
+/* Tell assembler to switch to the section for the exception handling
+   table.  */
+
+void
+exception_section ()
+{
+#ifdef ASM_OUTPUT_SECTION_NAME
+  named_section (NULL_TREE, ".gcc_except_table");
+#else
+  if (flag_pic)
+    data_section ();
+  else
+#if defined (EXCEPTION_SECTION)
+    EXCEPTION_SECTION ();
+#else
+    readonly_data_section ();
+#endif
+#endif
+}
 
 /* Create the rtl to represent a function, for a function definition.
    DECL is a FUNCTION_DECL node which describes which function.