File fpreserve-function-arguments4.patch of Package gcc41

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File fpreserve-function-arguments4.patch of Package gcc41

Index: gcc/gimplify.c
===================================================================
*** gcc/gimplify.c.orig	2007-08-27 16:39:56.000000000 +0200
--- gcc/gimplify.c	2007-09-28 19:40:59.000000000 +0200
*************** gimplify_body (tree *body_p, tree fndecl
*** 4976,4981 ****
--- 4976,5031 ----
        BIND_EXPR_BODY (body) = parm_stmts;
      }
  
+   /* If we want to forcibly preserve function argument values, do so here.  */
+   if (flag_preserve_function_arguments)
+     {
+       char s[1024] = "# ";
+       tree asmt, parm, inputs = NULL_TREE, stmts = NULL_TREE;
+       bool mem_p = false;
+       int i = 0;
+ 
+       sprintf (s + strlen(s), "%s ", IDENTIFIER_POINTER (DECL_NAME (fndecl)));
+ 
+       for (parm = DECL_ARGUMENTS (fndecl); parm ; parm = TREE_CHAIN (parm))
+ 	{
+ 	  tree pt = parm;
+ 	  tree type = TREE_TYPE (parm);
+ 	  /* Maybe build a fancy memory operand here.  For now just use
+ 	     a pointer input and let the operand scanner deal with the rest.  */
+ 	  if (TYPE_MODE (type) == BLKmode)
+ 	    {
+ 	      pt = build_fold_addr_expr (parm);
+ 	      type = TREE_TYPE (pt);
+ 	    }
+ 	  if (POINTER_TYPE_P (type))
+ 	    mem_p = true;
+ 	  sprintf (s + strlen(s), "%%%i ", i++);
+ 	  inputs = tree_cons (tree_cons (NULL_TREE, build_string (1, "g"),
+ 					 NULL_TREE), pt, inputs);
+ 	}
+ 
+       if (i != 0)
+ 	{
+ 	  /* While on the tree level we can do w/o explicit "memory"
+ 	     clobbering because we tweak the operand scanner, on RTL level
+ 	     we need it.  */
+ 	  tree clobbers = NULL_TREE;
+ 	  if (mem_p)
+ 	    clobbers = tree_cons (NULL_TREE, build_string (6, "memory"),
+ 				  NULL_TREE);
+           asmt = build4 (ASM_EXPR, void_type_node,
+ 			 build_string (strlen (s), s),
+ 			 NULL_TREE,  /* no outputs */
+ 			 inputs, clobbers);
+           ASM_VOLATILE_P (asmt) = 1;
+           TREE_READONLY (asmt) = 1;
+           gimplify_and_add (asmt, &stmts);
+ 
+           append_to_statement_list_force (BIND_EXPR_BODY (body), &stmts);
+           BIND_EXPR_BODY (body) = stmts;
+ 	}
+     }
+ 
    /* Unshare again, in case gimplification was sloppy.  */
    unshare_all_trees (body);
  
Index: gcc/common.opt
===================================================================
*** gcc/common.opt.orig	2007-02-05 13:59:11.000000000 +0100
--- gcc/common.opt	2007-09-28 15:29:26.000000000 +0200
*************** fmudflapir
*** 590,595 ****
--- 590,599 ----
  Common RejectNegative Report Var(flag_mudflap_ignore_reads)
  Ignore read operations when inserting mudflap instrumentation
  
+ fpreserve-function-arguments
+ Common Report Var(flag_preserve_function_arguments)
+ Preserve function argument values for debugging
+ 
  freschedule-modulo-scheduled-loops
  Common Report Var(flag_resched_modulo_sched)
  Enable/Disable the traditional scheduling in loops that already passed modulo scheduling
Index: gcc/tree-ssa-operands.c
===================================================================
*** gcc/tree-ssa-operands.c.orig	2007-06-06 16:58:54.000000000 +0200
--- gcc/tree-ssa-operands.c	2007-09-28 16:02:12.000000000 +0200
*************** Boston, MA 02110-1301, USA.  */
*** 103,108 ****
--- 103,110 ----
     to distinguish "reset the world" events from explicit MODIFY_EXPRs.  */
  #define opf_non_specific  (1 << 3)
  
+ /* Hack to mark all SSA_NAME uses in asms as abnormal.  */
+ #define opf_mark_abnormal (1 << 4)
  
  /* Array for building all the def operands.  */
  static VEC(tree,heap) *build_defs;
*************** get_asm_expr_operands (tree stmt)
*** 1343,1349 ****
    int i;
    tree link;
    const char *constraint;
!   bool allows_mem, allows_reg, is_inout;
  
    for (i=0, link = ASM_OUTPUTS (stmt); link; ++i, link = TREE_CHAIN (link))
      {
--- 1345,1351 ----
    int i;
    tree link;
    const char *constraint;
!   bool allows_mem, allows_reg, is_inout, memory_p;
  
    for (i=0, link = ASM_OUTPUTS (stmt); link; ++i, link = TREE_CHAIN (link))
      {
*************** get_asm_expr_operands (tree stmt)
*** 1367,1392 ****
        get_expr_operands (stmt, &TREE_VALUE (link), opf_is_def);
      }
  
!   for (link = ASM_INPUTS (stmt); link; link = TREE_CHAIN (link))
!     {
!       constraint
! 	= TREE_STRING_POINTER (TREE_VALUE (TREE_PURPOSE (link)));
!       parse_input_constraint (&constraint, 0, 0, noutputs, 0,
! 	  oconstraints, &allows_mem, &allows_reg);
! 
!       /* Memory operands are addressable.  Note that STMT needs the
! 	 address of this operand.  */
!       if (!allows_reg && allows_mem)
! 	{
! 	  tree t = get_base_address (TREE_VALUE (link));
! 	  if (t && DECL_P (t) && s_ann)
! 	    add_to_addressable_set (t, &s_ann->addresses_taken);
! 	}
! 
!       get_expr_operands (stmt, &TREE_VALUE (link), 0);
!     }
! 
! 
    /* Clobber memory for asm ("" : : : "memory");  */
    for (link = ASM_CLOBBERS (stmt); link; link = TREE_CHAIN (link))
      if (strcmp (TREE_STRING_POINTER (TREE_VALUE (link)), "memory") == 0)
--- 1369,1375 ----
        get_expr_operands (stmt, &TREE_VALUE (link), opf_is_def);
      }
  
!   memory_p = false;
    /* Clobber memory for asm ("" : : : "memory");  */
    for (link = ASM_CLOBBERS (stmt); link; link = TREE_CHAIN (link))
      if (strcmp (TREE_STRING_POINTER (TREE_VALUE (link)), "memory") == 0)
*************** get_asm_expr_operands (tree stmt)
*** 1394,1399 ****
--- 1377,1388 ----
  	unsigned i;
  	bitmap_iterator bi;
  
+         if (TREE_READONLY (stmt))
+ 	  {
+ 	    memory_p = true;
+ 	    break;
+ 	  }
+ 
  	/* Clobber all call-clobbered variables (or .GLOBAL_VAR if we
  	   decided to group them).  */
  	if (global_var)
*************** get_asm_expr_operands (tree stmt)
*** 1425,1430 ****
--- 1414,1470 ----
  
  	break;
        }
+ 
+   for (link = ASM_INPUTS (stmt); link; link = TREE_CHAIN (link))
+     {
+       constraint
+ 	= TREE_STRING_POINTER (TREE_VALUE (TREE_PURPOSE (link)));
+       parse_input_constraint (&constraint, 0, 0, noutputs, 0,
+ 	  oconstraints, &allows_mem, &allows_reg);
+ 
+       /* Memory operands are addressable.  Note that STMT needs the
+ 	 address of this operand.  */
+       if (!allows_reg && allows_mem)
+ 	{
+ 	  tree t = get_base_address (TREE_VALUE (link));
+ 	  if (t && DECL_P (t) && s_ann)
+ 	    add_to_addressable_set (t, &s_ann->addresses_taken);
+ 	}
+ 
+       get_expr_operands (stmt, &TREE_VALUE (link), opf_mark_abnormal);
+ 
+       /* Read-only memory.  Copied from get_indirect_ref_operands.  */
+       if (memory_p
+ 	  && POINTER_TYPE_P (TREE_TYPE (TREE_VALUE (link)))
+ 	  && SSA_VAR_P (TREE_VALUE (link)))
+         {
+ 	  tree ptr = TREE_VALUE (link);
+ 	  int flags = 0;
+       struct ptr_info_def *pi = NULL;
+ 
+       /* If PTR has flow-sensitive points-to information, use it.  */
+       if (TREE_CODE (ptr) == SSA_NAME
+ 	  && (pi = SSA_NAME_PTR_INFO (ptr)) != NULL
+ 	  && pi->name_mem_tag)
+ 	{
+ 	  /* PTR has its own memory tag.  Use it.  */
+ 	  add_stmt_operand (&pi->name_mem_tag, s_ann, flags);
+ 	}
+       else
+ 	{
+ 	  /* If PTR is not an SSA_NAME or it doesn't have a name
+ 	     tag, use its type memory tag.  */
+ 	  var_ann_t v_ann;
+ 
+ 	  if (TREE_CODE (ptr) == SSA_NAME)
+ 	    ptr = SSA_NAME_VAR (ptr);
+ 	  v_ann = var_ann (ptr);
+ 	  if (v_ann->type_mem_tag)
+ 	    add_stmt_operand (&v_ann->type_mem_tag, s_ann, flags);
+ 	}
+         }
+     }
+ 
  }
  
  /* A subroutine of get_expr_operands to handle INDIRECT_REF,
*************** add_stmt_operand (tree *var_p, stmt_ann_
*** 1681,1686 ****
--- 1721,1730 ----
  	append_def (var_p);
        else
  	append_use (var_p);
+ 
+       if (flags & opf_mark_abnormal
+ 	  && TREE_CODE (*var_p) == SSA_NAME)
+ 	SSA_NAME_OCCURS_IN_ABNORMAL_PHI (*var_p) = true;
      }
    else
      {
Index: gcc/combine.c
===================================================================
*** gcc/combine.c.orig	2007-05-19 19:09:46.000000000 +0200
--- gcc/combine.c	2007-09-28 18:14:51.000000000 +0200
*************** can_combine_p (rtx insn, rtx i3, rtx pre
*** 1265,1271 ****
  	 and it is a pain to update that information.
  	 Exception: if source is a constant, moving it later can't hurt.
  	 Accept that special case, because it helps -fforce-addr a lot.  */
!       || (INSN_CUID (insn) < last_call_cuid && ! CONSTANT_P (src)))
      return 0;
  
    /* DEST must either be a REG or CC0.  */
--- 1265,1278 ----
  	 and it is a pain to update that information.
  	 Exception: if source is a constant, moving it later can't hurt.
  	 Accept that special case, because it helps -fforce-addr a lot.  */
!       || (INSN_CUID (insn) < last_call_cuid && ! CONSTANT_P (src))
!       || (flag_preserve_function_arguments
! 	  && REG_P (dest)
! 	  && REG_P (src)
! 	  && GET_CODE (PATTERN (i3)) == PARALLEL
! 	  && GET_CODE (XVECEXP (PATTERN (i3), 0, 0)) == ASM_OPERANDS
! 	  && REG_USERVAR_P (dest)
! 	  && REG_EXPR (dest) != REG_EXPR (src)))
      return 0;
  
    /* DEST must either be a REG or CC0.  */
Index: gcc/var-tracking.c
===================================================================
*** gcc/var-tracking.c.orig	2007-02-20 11:27:19.000000000 +0100
--- gcc/var-tracking.c	2007-09-28 19:27:29.000000000 +0200
*************** dump_variable (void **slot, void *data A
*** 1750,1757 ****
    int i;
    location_chain node;
  
!   fprintf (dump_file, "  name: %s\n",
! 	   IDENTIFIER_POINTER (DECL_NAME (var->decl)));
    for (i = 0; i < var->n_var_parts; i++)
      {
        fprintf (dump_file, "    offset %ld\n",
--- 1750,1758 ----
    int i;
    location_chain node;
  
!   fprintf (dump_file, "  name: %sD.%u\n",
! 	   IDENTIFIER_POINTER (DECL_NAME (var->decl)),
! 	   DECL_UID (var->decl));
    for (i = 0; i < var->n_var_parts; i++)
      {
        fprintf (dump_file, "    offset %ld\n",
Index: gcc/recog.c
===================================================================
*** gcc/recog.c.orig	2005-12-22 13:49:10.000000000 +0100
--- gcc/recog.c	2007-10-05 14:52:54.000000000 +0200
*************** num_changes_pending (void)
*** 336,341 ****
--- 336,369 ----
    return num_changes;
  }
  
+ /* If we want to preserve arguments to inlined functions we need
+    to preserve some asm operands.  We know we changed OLD into NEW
+    in an asm instruction.  Return 1 if this wasn't okay, 0 otherwise.  */
+ static int
+ invalid_asm_change (rtx old, rtx new)
+ {
+   tree e1, e2;
+   /* It is invalid to change a REG which had an associated decl expression,
+      with something which has a different expression.  It's okay, though,
+      to change a REG with no expression to some other.  */
+   if (GET_CODE (old) == SUBREG)
+     old = SUBREG_REG (old);
+   if (GET_CODE (new) == SUBREG)
+     new = SUBREG_REG (new);
+   /* If we replaced something else than a REG or MEM, it's okay.  */
+   if (!REG_P (old) && !MEM_P (old))
+     return 0;
+   /* If we replaced a REG or MEM with something else, we are going
+      to loose that information.  */
+   if (!REG_P (new) && !MEM_P (new))
+     return 1;
+   e1 = REG_P (old) ? REG_EXPR (old) : MEM_EXPR (old);
+   if (!e1)
+     return 0;
+   e2 = REG_P (new) ? REG_EXPR (new) : MEM_EXPR (new);
+   return e1 != e2;
+ }
+ 
  /* Tentatively apply the changes numbered NUM and up.
     Return 1 if all changes are valid, zero otherwise.  */
  
*************** verify_changes (int num)
*** 368,373 ****
--- 396,405 ----
  	  if (! memory_address_p (GET_MODE (object), XEXP (object, 0)))
  	    break;
  	}
+       else if (flag_preserve_function_arguments
+ 	       && asm_noperands (PATTERN (object)) >= 0
+ 	       && invalid_asm_change (changes[i].old, *changes[i].loc))
+ 	break;
        else if (insn_invalid_p (object))
  	{
  	  rtx pat = PATTERN (object);

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File fpreserve-function-arguments4.patch of Package gcc41

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