OSDN Git Service

2011-01-13 Tobias Burnus <burnus@net-b.de>
[pf3gnuchains/gcc-fork.git] / gcc / fortran / trans-stmt.c
index 0a2ad53..8781d0e 100644 (file)
@@ -25,10 +25,6 @@ along with GCC; see the file COPYING3.  If not see
 #include "system.h"
 #include "coretypes.h"
 #include "tree.h"
-#include "gimple.h"
-#include "ggc.h"
-#include "toplev.h"
-#include "real.h"
 #include "gfortran.h"
 #include "flags.h"
 #include "trans.h"
@@ -38,6 +34,7 @@ along with GCC; see the file COPYING3.  If not see
 #include "trans-const.h"
 #include "arith.h"
 #include "dependency.h"
+#include "ggc.h"
 
 typedef struct iter_info
 {
@@ -152,8 +149,8 @@ gfc_trans_goto (gfc_code * code)
   gfc_start_block (&se.pre);
   gfc_conv_label_variable (&se, code->expr1);
   tmp = GFC_DECL_STRING_LEN (se.expr);
-  tmp = fold_build2 (NE_EXPR, boolean_type_node, tmp,
-                    build_int_cst (TREE_TYPE (tmp), -1));
+  tmp = fold_build2_loc (input_location, NE_EXPR, boolean_type_node, tmp,
+                        build_int_cst (TREE_TYPE (tmp), -1));
   gfc_trans_runtime_check (true, false, tmp, &se.pre, &loc,
                           "Assigned label is not a target label");
 
@@ -165,7 +162,8 @@ gfc_trans_goto (gfc_code * code)
      that's a very fragile business and may break with optimization.  So
      just ignore it.  */
 
-  target = fold_build1 (GOTO_EXPR, void_type_node, assigned_goto);
+  target = fold_build1_loc (input_location, GOTO_EXPR, void_type_node,
+                           assigned_goto);
   gfc_add_expr_to_block (&se.pre, target);
   return gfc_finish_block (&se.pre);
 }
@@ -242,6 +240,7 @@ gfc_conv_elemental_dependencies (gfc_se * se, gfc_se * loopse,
          /* Make a local loopinfo for the temporary creation, so that
             none of the other ss->info's have to be renormalized.  */
          gfc_init_loopinfo (&tmp_loop);
+         tmp_loop.dimen = info->dimen;
          for (n = 0; n < info->dimen; n++)
            {
              tmp_loop.to[n] = loopse->loop->to[n];
@@ -324,10 +323,11 @@ gfc_conv_elemental_dependencies (gfc_se * se, gfc_se * loopse,
            {
              tmp = gfc_conv_descriptor_stride_get (info->descriptor,
                                                    gfc_rank_cst[n]);
-             tmp = fold_build2 (MULT_EXPR, gfc_array_index_type,
-                                loopse->loop->from[n], tmp);
-             offset = fold_build2 (MINUS_EXPR, gfc_array_index_type,
-                                   offset, tmp);
+             tmp = fold_build2_loc (input_location, MULT_EXPR,
+                                    gfc_array_index_type,
+                                    loopse->loop->from[n], tmp);
+             offset = fold_build2_loc (input_location, MINUS_EXPR,
+                                       gfc_array_index_type, offset, tmp);
            }
          info->offset = gfc_create_var (gfc_array_index_type, NULL);     
          gfc_add_modify (&se->pre, info->offset, offset);
@@ -377,7 +377,7 @@ gfc_trans_call (gfc_code * code, bool dependency_check,
       /* Translate the call.  */
       has_alternate_specifier
        = gfc_conv_procedure_call (&se, code->resolved_sym, code->ext.actual,
-                                 code->expr1, NULL_TREE);
+                                 code->expr1, NULL);
 
       /* A subroutine without side-effect, by definition, does nothing!  */
       TREE_SIDE_EFFECTS (se.expr) = 1;
@@ -455,22 +455,22 @@ gfc_trans_call (gfc_code * code, bool dependency_check,
          index = count1;
          maskexpr = gfc_build_array_ref (mask, index, NULL);
          if (invert)
-           maskexpr = fold_build1 (TRUTH_NOT_EXPR, TREE_TYPE (maskexpr),
-                                   maskexpr);
+           maskexpr = fold_build1_loc (input_location, TRUTH_NOT_EXPR,
+                                       TREE_TYPE (maskexpr), maskexpr);
        }
 
       /* Add the subroutine call to the block.  */
       gfc_conv_procedure_call (&loopse, code->resolved_sym,
-                              code->ext.actual, code->expr1,
-                              NULL_TREE);
+                              code->ext.actual, code->expr1, NULL);
 
       if (mask && count1)
        {
          tmp = build3_v (COND_EXPR, maskexpr, loopse.expr,
                          build_empty_stmt (input_location));
          gfc_add_expr_to_block (&loopse.pre, tmp);
-         tmp = fold_build2 (PLUS_EXPR, gfc_array_index_type,
-                            count1, gfc_index_one_node);
+         tmp = fold_build2_loc (input_location, PLUS_EXPR,
+                                gfc_array_index_type,
+                                count1, gfc_index_one_node);
          gfc_add_modify (&loopse.pre, count1, tmp);
        }
       else
@@ -495,7 +495,7 @@ gfc_trans_call (gfc_code * code, bool dependency_check,
 /* Translate the RETURN statement.  */
 
 tree
-gfc_trans_return (gfc_code * code ATTRIBUTE_UNUSED)
+gfc_trans_return (gfc_code * code)
 {
   if (code->expr1)
     {
@@ -504,16 +504,16 @@ gfc_trans_return (gfc_code * code ATTRIBUTE_UNUSED)
       tree result;
 
       /* If code->expr is not NULL, this return statement must appear
-         in a subroutine and current_fake_result_decl has already
+        in a subroutine and current_fake_result_decl has already
         been generated.  */
 
       result = gfc_get_fake_result_decl (NULL, 0);
       if (!result)
-        {
-          gfc_warning ("An alternate return at %L without a * dummy argument",
-                        &code->expr1->where);
-          return build1_v (GOTO_EXPR, gfc_get_return_label ());
-        }
+       {
+         gfc_warning ("An alternate return at %L without a * dummy argument",
+                       &code->expr1->where);
+         return gfc_generate_return ();
+       }
 
       /* Start a new block for this statement.  */
       gfc_init_se (&se, NULL);
@@ -521,17 +521,21 @@ gfc_trans_return (gfc_code * code ATTRIBUTE_UNUSED)
 
       gfc_conv_expr (&se, code->expr1);
 
-      tmp = fold_build2 (MODIFY_EXPR, TREE_TYPE (result), result,
-                        fold_convert (TREE_TYPE (result), se.expr));
+      /* Note that the actually returned expression is a simple value and
+        does not depend on any pointers or such; thus we can clean-up with
+        se.post before returning.  */
+      tmp = fold_build2_loc (input_location, MODIFY_EXPR, TREE_TYPE (result),
+                            result, fold_convert (TREE_TYPE (result),
+                            se.expr));
       gfc_add_expr_to_block (&se.pre, tmp);
+      gfc_add_block_to_block (&se.pre, &se.post);
 
-      tmp = build1_v (GOTO_EXPR, gfc_get_return_label ());
+      tmp = gfc_generate_return ();
       gfc_add_expr_to_block (&se.pre, tmp);
-      gfc_add_block_to_block (&se.pre, &se.post);
       return gfc_finish_block (&se.pre);
     }
-  else
-    return build1_v (GOTO_EXPR, gfc_get_return_label ());
+
+  return gfc_generate_return ();
 }
 
 
@@ -552,9 +556,17 @@ gfc_trans_pause (gfc_code * code)
 
   if (code->expr1 == NULL)
     {
-      tmp = build_int_cst (gfc_int4_type_node, code->ext.stop_code);
+      tmp = build_int_cst (gfc_int4_type_node, 0);
+      tmp = build_call_expr_loc (input_location,
+                                gfor_fndecl_pause_string, 2,
+                                build_int_cst (pchar_type_node, 0), tmp);
+    }
+  else if (code->expr1->ts.type == BT_INTEGER)
+    {
+      gfc_conv_expr (&se, code->expr1);
       tmp = build_call_expr_loc (input_location,
-                            gfor_fndecl_pause_numeric, 1, tmp);
+                                gfor_fndecl_pause_numeric, 1,
+                                fold_convert (gfc_int4_type_node, se.expr));
     }
   else
     {
@@ -588,17 +600,27 @@ gfc_trans_stop (gfc_code *code, bool error_stop)
 
   if (code->expr1 == NULL)
     {
-      tmp = build_int_cst (gfc_int4_type_node, code->ext.stop_code);
+      tmp = build_int_cst (gfc_int4_type_node, 0);
       tmp = build_call_expr_loc (input_location,
-                            gfor_fndecl_stop_numeric, 1, tmp);
+                                error_stop ? gfor_fndecl_error_stop_string
+                                : gfor_fndecl_stop_string,
+                                2, build_int_cst (pchar_type_node, 0), tmp);
+    }
+  else if (code->expr1->ts.type == BT_INTEGER)
+    {
+      gfc_conv_expr (&se, code->expr1);
+      tmp = build_call_expr_loc (input_location,
+                                error_stop ? gfor_fndecl_error_stop_numeric
+                                : gfor_fndecl_stop_numeric_f08, 1, 
+                                fold_convert (gfc_int4_type_node, se.expr));
     }
   else
     {
       gfc_conv_expr_reference (&se, code->expr1);
       tmp = build_call_expr_loc (input_location,
-                            error_stop ? gfor_fndecl_error_stop_string
-                                     : gfor_fndecl_stop_string,
-                            2, se.expr, se.string_length);
+                                error_stop ? gfor_fndecl_error_stop_string
+                                : gfor_fndecl_stop_string,
+                                2, se.expr, se.string_length);
     }
 
   gfc_add_expr_to_block (&se.pre, tmp);
@@ -627,8 +649,8 @@ gfc_trans_sync (gfc_code *code, gfc_exec_op type __attribute__ ((unused)))
     {
       tree cond;
       gfc_conv_expr (&se, code->expr1);
-      cond = fold_build2 (NE_EXPR, boolean_type_node, se.expr,
-                         build_int_cst (TREE_TYPE (se.expr), 1));
+      cond = fold_build2_loc (input_location, NE_EXPR, boolean_type_node,
+                             se.expr, build_int_cst (TREE_TYPE (se.expr), 1));
       gfc_trans_runtime_check (true, false, cond, &se.pre,
                               &code->expr1->where, "Invalid image number "
                               "%d in SYNC IMAGES",
@@ -695,6 +717,7 @@ gfc_trans_if_1 (gfc_code * code)
 {
   gfc_se if_se;
   tree stmt, elsestmt;
+  location_t loc;
 
   /* Check for an unconditional ELSE clause.  */
   if (!code->expr1)
@@ -717,7 +740,9 @@ gfc_trans_if_1 (gfc_code * code)
     elsestmt = build_empty_stmt (input_location);
 
   /* Build the condition expression and add it to the condition block.  */
-  stmt = fold_build3 (COND_EXPR, void_type_node, if_se.expr, stmt, elsestmt);
+  loc = code->expr1->where.lb ? code->expr1->where.lb->location : input_location;
+  stmt = fold_build3_loc (loc, COND_EXPR, void_type_node, if_se.expr, stmt,
+                         elsestmt);
   
   gfc_add_expr_to_block (&if_se.pre, stmt);
 
@@ -728,10 +753,21 @@ gfc_trans_if_1 (gfc_code * code)
 tree
 gfc_trans_if (gfc_code * code)
 {
-  /* Ignore the top EXEC_IF, it only announces an IF construct. The
-     actual code we must translate is in code->block.  */
+  stmtblock_t body;
+  tree exit_label;
+
+  /* Create exit label so it is available for trans'ing the body code.  */
+  exit_label = gfc_build_label_decl (NULL_TREE);
+  code->exit_label = exit_label;
 
-  return gfc_trans_if_1 (code->block);
+  /* Translate the actual code in code->block.  */
+  gfc_init_block (&body);
+  gfc_add_expr_to_block (&body, gfc_trans_if_1 (code->block));
+
+  /* Add exit label.  */
+  gfc_add_expr_to_block (&body, build1_v (LABEL_EXPR, exit_label));
+
+  return gfc_finish_block (&body);
 }
 
 
@@ -786,11 +822,14 @@ gfc_trans_arithmetic_if (gfc_code * code)
       branch2 = build1_v (GOTO_EXPR, gfc_get_label_decl (code->label2));
 
       if (code->label1->value != code->label3->value)
-        tmp = fold_build2 (LT_EXPR, boolean_type_node, se.expr, zero);
+        tmp = fold_build2_loc (input_location, LT_EXPR, boolean_type_node,
+                              se.expr, zero);
       else
-        tmp = fold_build2 (NE_EXPR, boolean_type_node, se.expr, zero);
+        tmp = fold_build2_loc (input_location, NE_EXPR, boolean_type_node,
+                              se.expr, zero);
 
-      branch1 = fold_build3 (COND_EXPR, void_type_node, tmp, branch1, branch2);
+      branch1 = fold_build3_loc (input_location, COND_EXPR, void_type_node,
+                                tmp, branch1, branch2);
     }
   else
     branch1 = build1_v (GOTO_EXPR, gfc_get_label_decl (code->label1));
@@ -800,8 +839,10 @@ gfc_trans_arithmetic_if (gfc_code * code)
     {
       /* if (cond <= 0) take branch1 else take branch2.  */
       branch2 = build1_v (GOTO_EXPR, gfc_get_label_decl (code->label3));
-      tmp = fold_build2 (LE_EXPR, boolean_type_node, se.expr, zero);
-      branch1 = fold_build3 (COND_EXPR, void_type_node, tmp, branch1, branch2);
+      tmp = fold_build2_loc (input_location, LE_EXPR, boolean_type_node,
+                            se.expr, zero);
+      branch1 = fold_build3_loc (input_location, COND_EXPR, void_type_node,
+                                tmp, branch1, branch2);
     }
 
   /* Append the COND_EXPR to the evaluation of COND, and return.  */
@@ -825,6 +866,91 @@ gfc_trans_critical (gfc_code *code)
 }
 
 
+/* Do proper initialization for ASSOCIATE names.  */
+
+static void
+trans_associate_var (gfc_symbol *sym, gfc_wrapped_block *block)
+{
+  gfc_expr *e;
+  tree tmp;
+
+  gcc_assert (sym->assoc);
+  e = sym->assoc->target;
+
+  /* Do a `pointer assignment' with updated descriptor (or assign descriptor
+     to array temporary) for arrays with either unknown shape or if associating
+     to a variable.  */
+  if (sym->attr.dimension
+      && (sym->as->type == AS_DEFERRED || sym->assoc->variable))
+    {
+      gfc_se se;
+      gfc_ss *ss;
+      tree desc;
+
+      desc = sym->backend_decl;
+
+      /* If association is to an expression, evaluate it and create temporary.
+        Otherwise, get descriptor of target for pointer assignment.  */
+      gfc_init_se (&se, NULL);
+      ss = gfc_walk_expr (e);
+      if (sym->assoc->variable)
+       {
+         se.direct_byref = 1;
+         se.expr = desc;
+       }
+      gfc_conv_expr_descriptor (&se, e, ss);
+
+      /* If we didn't already do the pointer assignment, set associate-name
+        descriptor to the one generated for the temporary.  */
+      if (!sym->assoc->variable)
+       {
+         int dim;
+
+         gfc_add_modify (&se.pre, desc, se.expr);
+
+         /* The generated descriptor has lower bound zero (as array
+            temporary), shift bounds so we get lower bounds of 1.  */
+         for (dim = 0; dim < e->rank; ++dim)
+           gfc_conv_shift_descriptor_lbound (&se.pre, desc,
+                                             dim, gfc_index_one_node);
+       }
+
+      /* Done, register stuff as init / cleanup code.  */
+      gfc_add_init_cleanup (block, gfc_finish_block (&se.pre),
+                           gfc_finish_block (&se.post));
+    }
+
+  /* Do a scalar pointer assignment; this is for scalar variable targets.  */
+  else if (gfc_is_associate_pointer (sym))
+    {
+      gfc_se se;
+
+      gcc_assert (!sym->attr.dimension);
+
+      gfc_init_se (&se, NULL);
+      gfc_conv_expr (&se, e);
+
+      tmp = TREE_TYPE (sym->backend_decl);
+      tmp = gfc_build_addr_expr (tmp, se.expr);
+      gfc_add_modify (&se.pre, sym->backend_decl, tmp);
+      
+      gfc_add_init_cleanup (block, gfc_finish_block( &se.pre),
+                           gfc_finish_block (&se.post));
+    }
+
+  /* Do a simple assignment.  This is for scalar expressions, where we
+     can simply use expression assignment.  */
+  else
+    {
+      gfc_expr *lhs;
+
+      lhs = gfc_lval_expr_from_sym (sym);
+      tmp = gfc_trans_assignment (lhs, e, false, true);
+      gfc_add_init_cleanup (block, tmp, NULL_TREE);
+    }
+}
+
+
 /* Translate a BLOCK construct.  This is basically what we would do for a
    procedure body.  */
 
@@ -833,25 +959,35 @@ gfc_trans_block_construct (gfc_code* code)
 {
   gfc_namespace* ns;
   gfc_symbol* sym;
+  gfc_wrapped_block block;
+  tree exit_label;
   stmtblock_t body;
-  tree tmp;
+  gfc_association_list *ass;
 
-  ns = code->ext.ns;
+  ns = code->ext.block.ns;
   gcc_assert (ns);
   sym = ns->proc_name;
   gcc_assert (sym);
 
+  /* Process local variables.  */
   gcc_assert (!sym->tlink);
   sym->tlink = sym;
-
-  gfc_start_block (&body);
   gfc_process_block_locals (ns);
 
-  tmp = gfc_trans_code (ns->code);
-  tmp = gfc_trans_deferred_vars (sym, tmp);
-
-  gfc_add_expr_to_block (&body, tmp);
-  return gfc_finish_block (&body);
+  /* Generate code including exit-label.  */
+  gfc_init_block (&body);
+  exit_label = gfc_build_label_decl (NULL_TREE);
+  code->exit_label = exit_label;
+  gfc_add_expr_to_block (&body, gfc_trans_code (ns->code));
+  gfc_add_expr_to_block (&body, build1_v (LABEL_EXPR, exit_label));
+
+  /* Finish everything.  */
+  gfc_start_wrapped_block (&block, gfc_finish_block (&body));
+  gfc_trans_deferred_vars (sym, &block);
+  for (ass = code->ext.block.assoc; ass; ass = ass->next)
+    trans_associate_var (ass->st->n.sym, &block);
+    
+  return gfc_finish_wrapped_block (&block);
 }
 
 
@@ -896,17 +1032,20 @@ gfc_trans_simple_do (gfc_code * code, stmtblock_t *pblock, tree dovar,
   tree saved_dovar = NULL;
   tree cycle_label;
   tree exit_label;
+  location_t loc;
   
   type = TREE_TYPE (dovar);
 
+  loc = code->ext.iterator->start->where.lb->location;
+
   /* Initialize the DO variable: dovar = from.  */
-  gfc_add_modify (pblock, dovar, from);
+  gfc_add_modify_loc (loc, pblock, dovar, from);
   
   /* Save value for do-tinkering checking. */
   if (gfc_option.rtcheck & GFC_RTCHECK_DO)
     {
       saved_dovar = gfc_create_var (type, ".saved_dovar");
-      gfc_add_modify (pblock, saved_dovar, dovar);
+      gfc_add_modify_loc (loc, pblock, saved_dovar, dovar);
     }
 
   /* Cycle and exit statements are implemented with gotos.  */
@@ -914,7 +1053,8 @@ gfc_trans_simple_do (gfc_code * code, stmtblock_t *pblock, tree dovar,
   exit_label = gfc_build_label_decl (NULL_TREE);
 
   /* Put the labels where they can be found later. See gfc_trans_do().  */
-  code->block->backend_decl = tree_cons (cycle_label, exit_label, NULL);
+  code->cycle_label = cycle_label;
+  code->exit_label = exit_label;
 
   /* Loop body.  */
   gfc_start_block (&body);
@@ -933,7 +1073,8 @@ gfc_trans_simple_do (gfc_code * code, stmtblock_t *pblock, tree dovar,
   /* Check whether someone has modified the loop variable. */
   if (gfc_option.rtcheck & GFC_RTCHECK_DO)
     {
-      tmp = fold_build2 (NE_EXPR, boolean_type_node, dovar, saved_dovar);
+      tmp = fold_build2_loc (loc, NE_EXPR, boolean_type_node,
+                            dovar, saved_dovar);
       gfc_trans_runtime_check (true, false, tmp, &body, &code->loc,
                               "Loop variable has been modified");
     }
@@ -942,40 +1083,44 @@ gfc_trans_simple_do (gfc_code * code, stmtblock_t *pblock, tree dovar,
   if (exit_cond)
     {
       tmp = build1_v (GOTO_EXPR, exit_label);
-      tmp = fold_build3 (COND_EXPR, void_type_node, exit_cond, tmp,
-                        build_empty_stmt (input_location));
+      tmp = fold_build3_loc (loc, COND_EXPR, void_type_node,
+                            exit_cond, tmp,
+                            build_empty_stmt (loc));
       gfc_add_expr_to_block (&body, tmp);
     }
 
   /* Evaluate the loop condition.  */
-  cond = fold_build2 (EQ_EXPR, boolean_type_node, dovar, to);
-  cond = gfc_evaluate_now (cond, &body);
+  cond = fold_build2_loc (loc, EQ_EXPR, boolean_type_node, dovar,
+                         to);
+  cond = gfc_evaluate_now_loc (loc, cond, &body);
 
   /* Increment the loop variable.  */
-  tmp = fold_build2 (PLUS_EXPR, type, dovar, step);
-  gfc_add_modify (&body, dovar, tmp);
+  tmp = fold_build2_loc (loc, PLUS_EXPR, type, dovar, step);
+  gfc_add_modify_loc (loc, &body, dovar, tmp);
 
   if (gfc_option.rtcheck & GFC_RTCHECK_DO)
-    gfc_add_modify (&body, saved_dovar, dovar);
+    gfc_add_modify_loc (loc, &body, saved_dovar, dovar);
 
   /* The loop exit.  */
-  tmp = build1_v (GOTO_EXPR, exit_label);
+  tmp = fold_build1_loc (loc, GOTO_EXPR, void_type_node, exit_label);
   TREE_USED (exit_label) = 1;
-  tmp = fold_build3 (COND_EXPR, void_type_node,
-                    cond, tmp, build_empty_stmt (input_location));
+  tmp = fold_build3_loc (loc, COND_EXPR, void_type_node,
+                        cond, tmp, build_empty_stmt (loc));
   gfc_add_expr_to_block (&body, tmp);
 
   /* Finish the loop body.  */
   tmp = gfc_finish_block (&body);
-  tmp = build1_v (LOOP_EXPR, tmp);
+  tmp = fold_build1_loc (loc, LOOP_EXPR, void_type_node, tmp);
 
   /* Only execute the loop if the number of iterations is positive.  */
   if (tree_int_cst_sgn (step) > 0)
-    cond = fold_build2 (LE_EXPR, boolean_type_node, dovar, to);
+    cond = fold_build2_loc (loc, LE_EXPR, boolean_type_node, dovar,
+                           to);
   else
-    cond = fold_build2 (GE_EXPR, boolean_type_node, dovar, to);
-  tmp = fold_build3 (COND_EXPR, void_type_node,
-                    cond, tmp, build_empty_stmt (input_location));
+    cond = fold_build2_loc (loc, GE_EXPR, boolean_type_node, dovar,
+                           to);
+  tmp = fold_build3_loc (loc, COND_EXPR, void_type_node, cond, tmp,
+                        build_empty_stmt (loc));
   gfc_add_expr_to_block (pblock, tmp);
 
   /* Add the exit label.  */
@@ -1038,9 +1183,12 @@ gfc_trans_do (gfc_code * code, tree exit_cond)
   tree pos_step;
   stmtblock_t block;
   stmtblock_t body;
+  location_t loc;
 
   gfc_start_block (&block);
 
+  loc = code->ext.iterator->start->where.lb->location;
+
   /* Evaluate all the expressions in the iterator.  */
   gfc_init_se (&se, NULL);
   gfc_conv_expr_lhs (&se, code->ext.iterator->var);
@@ -1065,8 +1213,8 @@ gfc_trans_do (gfc_code * code, tree exit_cond)
 
   if (gfc_option.rtcheck & GFC_RTCHECK_DO)
     {
-      tmp = fold_build2 (EQ_EXPR, boolean_type_node, step,
-                        fold_convert (type, integer_zero_node));
+      tmp = fold_build2_loc (input_location, EQ_EXPR, boolean_type_node, step,
+                            build_zero_cst (type));
       gfc_trans_runtime_check (true, false, tmp, &block, &code->loc,
                               "DO step value is zero");
     }
@@ -1077,8 +1225,8 @@ gfc_trans_do (gfc_code * code, tree exit_cond)
        || tree_int_cst_equal (step, integer_minus_one_node)))
     return gfc_trans_simple_do (code, &block, dovar, from, to, step, exit_cond);
 
-  pos_step = fold_build2 (GT_EXPR, boolean_type_node, step,
-                         fold_convert (type, integer_zero_node));
+  pos_step = fold_build2_loc (loc, GT_EXPR, boolean_type_node, step,
+                             build_zero_cst (type));
 
   if (TREE_CODE (type) == INTEGER_TYPE)
     utype = unsigned_type_for (type);
@@ -1091,6 +1239,10 @@ gfc_trans_do (gfc_code * code, tree exit_cond)
   exit_label = gfc_build_label_decl (NULL_TREE);
   TREE_USED (exit_label) = 1;
 
+  /* Put these labels where they can be found later.  */
+  code->cycle_label = cycle_label;
+  code->exit_label = exit_label;
+
   /* Initialize the DO variable: dovar = from.  */
   gfc_add_modify (&block, dovar, from);
 
@@ -1098,7 +1250,7 @@ gfc_trans_do (gfc_code * code, tree exit_cond)
   if (gfc_option.rtcheck & GFC_RTCHECK_DO)
     {
       saved_dovar = gfc_create_var (type, ".saved_dovar");
-      gfc_add_modify (&block, saved_dovar, dovar);
+      gfc_add_modify_loc (loc, &block, saved_dovar, dovar);
     }
 
   /* Initialize loop count and jump to exit label if the loop is empty.
@@ -1124,36 +1276,40 @@ gfc_trans_do (gfc_code * code, tree exit_cond)
 
       /* Calculate SIGN (1,step), as (step < 0 ? -1 : 1)  */
 
-      tmp = fold_build2 (LT_EXPR, boolean_type_node, step, 
-                        build_int_cst (TREE_TYPE (step), 0));
-      step_sign = fold_build3 (COND_EXPR, type, tmp, 
-                              build_int_cst (type, -1), 
-                              build_int_cst (type, 1));
-
-      tmp = fold_build2 (LT_EXPR, boolean_type_node, to, from);
-      pos = fold_build3 (COND_EXPR, void_type_node, tmp,
-                        build1_v (GOTO_EXPR, exit_label),
-                        build_empty_stmt (input_location));
-
-      tmp = fold_build2 (GT_EXPR, boolean_type_node, to, from);
-      neg = fold_build3 (COND_EXPR, void_type_node, tmp,
-                        build1_v (GOTO_EXPR, exit_label),
-                        build_empty_stmt (input_location));
-      tmp = fold_build3 (COND_EXPR, void_type_node, pos_step, pos, neg);
+      tmp = fold_build2_loc (loc, LT_EXPR, boolean_type_node, step,
+                            build_int_cst (TREE_TYPE (step), 0));
+      step_sign = fold_build3_loc (loc, COND_EXPR, type, tmp, 
+                                  build_int_cst (type, -1), 
+                                  build_int_cst (type, 1));
+
+      tmp = fold_build2_loc (loc, LT_EXPR, boolean_type_node, to, from);
+      pos = fold_build3_loc (loc, COND_EXPR, void_type_node, tmp,
+                            fold_build1_loc (loc, GOTO_EXPR, void_type_node,
+                                             exit_label),
+                            build_empty_stmt (loc));
+
+      tmp = fold_build2_loc (loc, GT_EXPR, boolean_type_node, to,
+                            from);
+      neg = fold_build3_loc (loc, COND_EXPR, void_type_node, tmp,
+                            fold_build1_loc (loc, GOTO_EXPR, void_type_node,
+                                             exit_label),
+                            build_empty_stmt (loc));
+      tmp = fold_build3_loc (loc, COND_EXPR, void_type_node,
+                            pos_step, pos, neg);
 
       gfc_add_expr_to_block (&block, tmp);
 
       /* Calculate the loop count.  to-from can overflow, so
         we cast to unsigned.  */
 
-      to2 = fold_build2 (MULT_EXPR, type, step_sign, to);
-      from2 = fold_build2 (MULT_EXPR, type, step_sign, from);
-      step2 = fold_build2 (MULT_EXPR, type, step_sign, step);
+      to2 = fold_build2_loc (loc, MULT_EXPR, type, step_sign, to);
+      from2 = fold_build2_loc (loc, MULT_EXPR, type, step_sign, from);
+      step2 = fold_build2_loc (loc, MULT_EXPR, type, step_sign, step);
       step2 = fold_convert (utype, step2);
-      tmp = fold_build2 (MINUS_EXPR, type, to2, from2);
+      tmp = fold_build2_loc (loc, MINUS_EXPR, type, to2, from2);
       tmp = fold_convert (utype, tmp);
-      tmp = fold_build2 (TRUNC_DIV_EXPR, utype, tmp, step2);
-      tmp = fold_build2 (MODIFY_EXPR, void_type_node, countm1, tmp);
+      tmp = fold_build2_loc (loc, TRUNC_DIV_EXPR, utype, tmp, step2);
+      tmp = fold_build2_loc (loc, MODIFY_EXPR, void_type_node, countm1, tmp);
       gfc_add_expr_to_block (&block, tmp);
     }
   else
@@ -1162,18 +1318,20 @@ gfc_trans_do (gfc_code * code, tree exit_cond)
         This would probably cause more problems that it solves
         when we implement "long double" types.  */
 
-      tmp = fold_build2 (MINUS_EXPR, type, to, from);
-      tmp = fold_build2 (RDIV_EXPR, type, tmp, step);
-      tmp = fold_build1 (FIX_TRUNC_EXPR, utype, tmp);
+      tmp = fold_build2_loc (loc, MINUS_EXPR, type, to, from);
+      tmp = fold_build2_loc (loc, RDIV_EXPR, type, tmp, step);
+      tmp = fold_build1_loc (loc, FIX_TRUNC_EXPR, utype, tmp);
       gfc_add_modify (&block, countm1, tmp);
 
       /* We need a special check for empty loops:
         empty = (step > 0 ? to < from : to > from);  */
-      tmp = fold_build3 (COND_EXPR, boolean_type_node, pos_step,
-                        fold_build2 (LT_EXPR, boolean_type_node, to, from),
-                        fold_build2 (GT_EXPR, boolean_type_node, to, from));
+      tmp = fold_build3_loc (loc, COND_EXPR, boolean_type_node, pos_step,
+                            fold_build2_loc (loc, LT_EXPR,
+                                             boolean_type_node, to, from),
+                            fold_build2_loc (loc, GT_EXPR,
+                                             boolean_type_node, to, from));
       /* If the loop is empty, go directly to the exit label.  */
-      tmp = fold_build3 (COND_EXPR, void_type_node, tmp,
+      tmp = fold_build3_loc (loc, COND_EXPR, void_type_node, tmp,
                         build1_v (GOTO_EXPR, exit_label),
                         build_empty_stmt (input_location));
       gfc_add_expr_to_block (&block, tmp);
@@ -1182,13 +1340,6 @@ gfc_trans_do (gfc_code * code, tree exit_cond)
   /* Loop body.  */
   gfc_start_block (&body);
 
-  /* Put these labels where they can be found later. We put the
-     labels in a TREE_LIST node (because TREE_CHAIN is already
-     used). cycle_label goes in TREE_PURPOSE (backend_decl), exit
-     label in TREE_VALUE (backend_decl).  */
-
-  code->block->backend_decl = tree_cons (cycle_label, exit_label, NULL);
-
   /* Main loop body.  */
   tmp = gfc_trans_code_cond (code->block->next, exit_cond);
   gfc_add_expr_to_block (&body, tmp);
@@ -1203,7 +1354,8 @@ gfc_trans_do (gfc_code * code, tree exit_cond)
   /* Check whether someone has modified the loop variable. */
   if (gfc_option.rtcheck & GFC_RTCHECK_DO)
     {
-      tmp = fold_build2 (NE_EXPR, boolean_type_node, dovar, saved_dovar);
+      tmp = fold_build2_loc (loc, NE_EXPR, boolean_type_node, dovar,
+                            saved_dovar);
       gfc_trans_runtime_check (true, false, tmp, &body, &code->loc,
                               "Loop variable has been modified");
     }
@@ -1212,35 +1364,37 @@ gfc_trans_do (gfc_code * code, tree exit_cond)
   if (exit_cond)
     {
       tmp = build1_v (GOTO_EXPR, exit_label);
-      tmp = fold_build3 (COND_EXPR, void_type_node, exit_cond, tmp,
-                        build_empty_stmt (input_location));
+      tmp = fold_build3_loc (loc, COND_EXPR, void_type_node,
+                            exit_cond, tmp,
+                            build_empty_stmt (input_location));
       gfc_add_expr_to_block (&body, tmp);
     }
 
   /* Increment the loop variable.  */
-  tmp = fold_build2 (PLUS_EXPR, type, dovar, step);
-  gfc_add_modify (&body, dovar, tmp);
+  tmp = fold_build2_loc (loc, PLUS_EXPR, type, dovar, step);
+  gfc_add_modify_loc (loc, &body, dovar, tmp);
 
   if (gfc_option.rtcheck & GFC_RTCHECK_DO)
-    gfc_add_modify (&body, saved_dovar, dovar);
+    gfc_add_modify_loc (loc, &body, saved_dovar, dovar);
 
   /* End with the loop condition.  Loop until countm1 == 0.  */
-  cond = fold_build2 (EQ_EXPR, boolean_type_node, countm1,
-                     build_int_cst (utype, 0));
-  tmp = build1_v (GOTO_EXPR, exit_label);
-  tmp = fold_build3 (COND_EXPR, void_type_node,
-                    cond, tmp, build_empty_stmt (input_location));
+  cond = fold_build2_loc (loc, EQ_EXPR, boolean_type_node, countm1,
+                         build_int_cst (utype, 0));
+  tmp = fold_build1_loc (loc, GOTO_EXPR, void_type_node, exit_label);
+  tmp = fold_build3_loc (loc, COND_EXPR, void_type_node,
+                        cond, tmp, build_empty_stmt (loc));
   gfc_add_expr_to_block (&body, tmp);
 
   /* Decrement the loop count.  */
-  tmp = fold_build2 (MINUS_EXPR, utype, countm1, build_int_cst (utype, 1));
-  gfc_add_modify (&body, countm1, tmp);
+  tmp = fold_build2_loc (loc, MINUS_EXPR, utype, countm1,
+                        build_int_cst (utype, 1));
+  gfc_add_modify_loc (loc, &body, countm1, tmp);
 
   /* End of loop body.  */
   tmp = gfc_finish_block (&body);
 
   /* The for loop itself.  */
-  tmp = build1_v (LOOP_EXPR, tmp);
+  tmp = fold_build1_loc (loc, LOOP_EXPR, void_type_node, tmp);
   gfc_add_expr_to_block (&block, tmp);
 
   /* Add the exit label.  */
@@ -1291,19 +1445,22 @@ gfc_trans_do_while (gfc_code * code)
   exit_label = gfc_build_label_decl (NULL_TREE);
 
   /* Put the labels where they can be found later. See gfc_trans_do().  */
-  code->block->backend_decl = tree_cons (cycle_label, exit_label, NULL);
+  code->cycle_label = cycle_label;
+  code->exit_label = exit_label;
 
   /* Create a GIMPLE version of the exit condition.  */
   gfc_init_se (&cond, NULL);
   gfc_conv_expr_val (&cond, code->expr1);
   gfc_add_block_to_block (&block, &cond.pre);
-  cond.expr = fold_build1 (TRUTH_NOT_EXPR, boolean_type_node, cond.expr);
+  cond.expr = fold_build1_loc (code->expr1->where.lb->location,
+                              TRUTH_NOT_EXPR, boolean_type_node, cond.expr);
 
   /* Build "IF (! cond) GOTO exit_label".  */
   tmp = build1_v (GOTO_EXPR, exit_label);
   TREE_USED (exit_label) = 1;
-  tmp = fold_build3 (COND_EXPR, void_type_node,
-                    cond.expr, tmp, build_empty_stmt (input_location));
+  tmp = fold_build3_loc (code->expr1->where.lb->location, COND_EXPR,
+                        void_type_node, cond.expr, tmp,
+                        build_empty_stmt (code->expr1->where.lb->location));
   gfc_add_expr_to_block (&block, tmp);
 
   /* The main body of the loop.  */
@@ -1322,7 +1479,8 @@ gfc_trans_do_while (gfc_code * code)
 
   gfc_init_block (&block);
   /* Build the loop.  */
-  tmp = build1_v (LOOP_EXPR, tmp);
+  tmp = fold_build1_loc (code->expr1->where.lb->location, LOOP_EXPR,
+                        void_type_node, tmp);
   gfc_add_expr_to_block (&block, tmp);
 
   /* Add the exit label.  */
@@ -1402,7 +1560,7 @@ gfc_trans_integer_select (gfc_code * code)
 
   for (c = code->block; c; c = c->block)
     {
-      for (cp = c->ext.case_list; cp; cp = cp->next)
+      for (cp = c->ext.block.case_list; cp; cp = cp->next)
        {
          tree low, high;
           tree label;
@@ -1456,8 +1614,8 @@ gfc_trans_integer_select (gfc_code * code)
 
          /* Add this case label.
              Add parameter 'label', make it match GCC backend.  */
-         tmp = fold_build3 (CASE_LABEL_EXPR, void_type_node,
-                            low, high, label);
+         tmp = fold_build3_loc (input_location, CASE_LABEL_EXPR,
+                                void_type_node, low, high, label);
          gfc_add_expr_to_block (&body, tmp);
        }
 
@@ -1514,7 +1672,7 @@ gfc_trans_logical_select (gfc_code * code)
      always executed, and we don't generate code a COND_EXPR.  */
   for (c = code->block; c; c = c->block)
     {
-      for (cp = c->ext.case_list; cp; cp = cp->next)
+      for (cp = c->ext.block.case_list; cp; cp = cp->next)
        {
          if (cp->low)
            {
@@ -1572,8 +1730,8 @@ gfc_trans_logical_select (gfc_code * code)
       if (f != NULL)
        false_tree = gfc_trans_code (f->next);
 
-      stmt = fold_build3 (COND_EXPR, void_type_node, se.expr,
-                         true_tree, false_tree);
+      stmt = fold_build3_loc (input_location, COND_EXPR, void_type_node,
+                             se.expr, true_tree, false_tree);
       gfc_add_expr_to_block (&block, stmt);
     }
 
@@ -1581,6 +1739,10 @@ gfc_trans_logical_select (gfc_code * code)
 }
 
 
+/* The jump table types are stored in static variables to avoid
+   constructing them from scratch every single time.  */
+static GTY(()) tree select_struct[2];
+
 /* Translate the SELECT CASE construct for CHARACTER case expressions.
    Instead of generating compares and jumps, it is far simpler to
    generate a data structure describing the cases in order and call a
@@ -1593,21 +1755,175 @@ gfc_trans_logical_select (gfc_code * code)
 static tree
 gfc_trans_character_select (gfc_code *code)
 {
-  tree init, node, end_label, tmp, type, case_num, label, fndecl;
+  tree init, end_label, tmp, type, case_num, label, fndecl;
   stmtblock_t block, body;
   gfc_case *cp, *d;
   gfc_code *c;
-  gfc_se se;
+  gfc_se se, expr1se;
   int n, k;
+  VEC(constructor_elt,gc) *inits = NULL;
+
+  tree pchartype = gfc_get_pchar_type (code->expr1->ts.kind);
 
   /* The jump table types are stored in static variables to avoid
      constructing them from scratch every single time.  */
-  static tree select_struct[2];
   static tree ss_string1[2], ss_string1_len[2];
   static tree ss_string2[2], ss_string2_len[2];
   static tree ss_target[2];
 
-  tree pchartype = gfc_get_pchar_type (code->expr1->ts.kind);
+  cp = code->block->ext.block.case_list;
+  while (cp->left != NULL)
+    cp = cp->left;
+
+  /* Generate the body */
+  gfc_start_block (&block);
+  gfc_init_se (&expr1se, NULL);
+  gfc_conv_expr_reference (&expr1se, code->expr1);
+
+  gfc_add_block_to_block (&block, &expr1se.pre);
+
+  end_label = gfc_build_label_decl (NULL_TREE);
+
+  gfc_init_block (&body);
+
+  /* Attempt to optimize length 1 selects.  */
+  if (integer_onep (expr1se.string_length))
+    {
+      for (d = cp; d; d = d->right)
+       {
+         int i;
+         if (d->low)
+           {
+             gcc_assert (d->low->expr_type == EXPR_CONSTANT
+                         && d->low->ts.type == BT_CHARACTER);
+             if (d->low->value.character.length > 1)
+               {
+                 for (i = 1; i < d->low->value.character.length; i++)
+                   if (d->low->value.character.string[i] != ' ')
+                     break;
+                 if (i != d->low->value.character.length)
+                   {
+                     if (optimize && d->high && i == 1)
+                       {
+                         gcc_assert (d->high->expr_type == EXPR_CONSTANT
+                                     && d->high->ts.type == BT_CHARACTER);
+                         if (d->high->value.character.length > 1
+                             && (d->low->value.character.string[0]
+                                 == d->high->value.character.string[0])
+                             && d->high->value.character.string[1] != ' '
+                             && ((d->low->value.character.string[1] < ' ')
+                                 == (d->high->value.character.string[1]
+                                     < ' ')))
+                           continue;
+                       }
+                     break;
+                   }
+               }
+           }
+         if (d->high)
+           {
+             gcc_assert (d->high->expr_type == EXPR_CONSTANT
+                         && d->high->ts.type == BT_CHARACTER);
+             if (d->high->value.character.length > 1)
+               {
+                 for (i = 1; i < d->high->value.character.length; i++)
+                   if (d->high->value.character.string[i] != ' ')
+                     break;
+                 if (i != d->high->value.character.length)
+                   break;
+               }
+           }
+       }
+      if (d == NULL)
+       {
+         tree ctype = gfc_get_char_type (code->expr1->ts.kind);
+
+         for (c = code->block; c; c = c->block)
+           {
+             for (cp = c->ext.block.case_list; cp; cp = cp->next)
+               {
+                 tree low, high;
+                 tree label;
+                 gfc_char_t r;
+
+                 /* Assume it's the default case.  */
+                 low = high = NULL_TREE;
+
+                 if (cp->low)
+                   {
+                     /* CASE ('ab') or CASE ('ab':'az') will never match
+                        any length 1 character.  */
+                     if (cp->low->value.character.length > 1
+                         && cp->low->value.character.string[1] != ' ')
+                       continue;
+
+                     if (cp->low->value.character.length > 0)
+                       r = cp->low->value.character.string[0];
+                     else
+                       r = ' ';
+                     low = build_int_cst (ctype, r);
+
+                     /* If there's only a lower bound, set the high bound
+                        to the maximum value of the case expression.  */
+                     if (!cp->high)
+                       high = TYPE_MAX_VALUE (ctype);
+                   }
+
+                 if (cp->high)
+                   {
+                     if (!cp->low
+                         || (cp->low->value.character.string[0]
+                             != cp->high->value.character.string[0]))
+                       {
+                         if (cp->high->value.character.length > 0)
+                           r = cp->high->value.character.string[0];
+                         else
+                           r = ' ';
+                         high = build_int_cst (ctype, r);
+                       }
+
+                     /* Unbounded case.  */
+                     if (!cp->low)
+                       low = TYPE_MIN_VALUE (ctype);
+                   }
+
+                 /* Build a label.  */
+                 label = gfc_build_label_decl (NULL_TREE);
+
+                 /* Add this case label.
+                    Add parameter 'label', make it match GCC backend.  */
+                 tmp = fold_build3_loc (input_location, CASE_LABEL_EXPR,
+                                        void_type_node, low, high, label);
+                 gfc_add_expr_to_block (&body, tmp);
+               }
+
+             /* Add the statements for this case.  */
+             tmp = gfc_trans_code (c->next);
+             gfc_add_expr_to_block (&body, tmp);
+
+             /* Break to the end of the construct.  */
+             tmp = build1_v (GOTO_EXPR, end_label);
+             gfc_add_expr_to_block (&body, tmp);
+           }
+
+         tmp = gfc_string_to_single_character (expr1se.string_length,
+                                               expr1se.expr,
+                                               code->expr1->ts.kind);
+         case_num = gfc_create_var (ctype, "case_num");
+         gfc_add_modify (&block, case_num, tmp);
+
+         gfc_add_block_to_block (&block, &expr1se.post);
+
+         tmp = gfc_finish_block (&body);
+         tmp = build3_v (SWITCH_EXPR, case_num, tmp, NULL_TREE);
+         gfc_add_expr_to_block (&block, tmp);
+
+         tmp = build1_v (LABEL_EXPR, end_label);
+         gfc_add_expr_to_block (&block, tmp);
+
+         return gfc_finish_block (&block);
+       }
+    }
 
   if (code->expr1->ts.kind == 1)
     k = 0;
@@ -1618,6 +1934,7 @@ gfc_trans_character_select (gfc_code *code)
 
   if (select_struct[k] == NULL)
     {
+      tree *chain = NULL;
       select_struct[k] = make_node (RECORD_TYPE);
 
       if (code->expr1->ts.kind == 1)
@@ -1628,10 +1945,11 @@ gfc_trans_character_select (gfc_code *code)
        gcc_unreachable ();
 
 #undef ADD_FIELD
-#define ADD_FIELD(NAME, TYPE)                                  \
-  ss_##NAME[k] = gfc_add_field_to_struct                               \
-     (&(TYPE_FIELDS (select_struct[k])), select_struct[k],     \
-      get_identifier (stringize(NAME)), TYPE)
+#define ADD_FIELD(NAME, TYPE)                                              \
+  ss_##NAME[k] = gfc_add_field_to_struct (select_struct[k],                \
+                                         get_identifier (stringize(NAME)), \
+                                         TYPE,                             \
+                                         &chain)
 
       ADD_FIELD (string1, pchartype);
       ADD_FIELD (string1_len, gfc_charlen_type_node);
@@ -1645,28 +1963,20 @@ gfc_trans_character_select (gfc_code *code)
       gfc_finish_type (select_struct[k]);
     }
 
-  cp = code->block->ext.case_list;
-  while (cp->left != NULL)
-    cp = cp->left;
-
   n = 0;
   for (d = cp; d; d = d->right)
     d->n = n++;
 
-  end_label = gfc_build_label_decl (NULL_TREE);
-
-  /* Generate the body */
-  gfc_start_block (&block);
-  gfc_init_block (&body);
-
   for (c = code->block; c; c = c->block)
     {
-      for (d = c->ext.case_list; d; d = d->next)
+      for (d = c->ext.block.case_list; d; d = d->next)
         {
          label = gfc_build_label_decl (NULL_TREE);
-         tmp = fold_build3 (CASE_LABEL_EXPR, void_type_node,
-                            build_int_cst (NULL_TREE, d->n),
-                            build_int_cst (NULL_TREE, d->n), label);
+         tmp = fold_build3_loc (input_location, CASE_LABEL_EXPR,
+                                void_type_node,
+                                (d->low == NULL && d->high == NULL)
+                                ? NULL : build_int_cst (NULL_TREE, d->n),
+                                NULL, label);
           gfc_add_expr_to_block (&body, tmp);
         }
 
@@ -1678,52 +1988,50 @@ gfc_trans_character_select (gfc_code *code)
     }
 
   /* Generate the structure describing the branches */
-  init = NULL_TREE;
-
-  for(d = cp; d; d = d->right)
+  for (d = cp; d; d = d->right)
     {
-      node = NULL_TREE;
+      VEC(constructor_elt,gc) *node = NULL;
 
       gfc_init_se (&se, NULL);
 
       if (d->low == NULL)
         {
-          node = tree_cons (ss_string1[k], null_pointer_node, node);
-          node = tree_cons (ss_string1_len[k], integer_zero_node, node);
+          CONSTRUCTOR_APPEND_ELT (node, ss_string1[k], null_pointer_node);
+          CONSTRUCTOR_APPEND_ELT (node, ss_string1_len[k], integer_zero_node);
         }
       else
         {
           gfc_conv_expr_reference (&se, d->low);
 
-          node = tree_cons (ss_string1[k], se.expr, node);
-          node = tree_cons (ss_string1_len[k], se.string_length, node);
+          CONSTRUCTOR_APPEND_ELT (node, ss_string1[k], se.expr);
+          CONSTRUCTOR_APPEND_ELT (node, ss_string1_len[k], se.string_length);
         }
 
       if (d->high == NULL)
         {
-          node = tree_cons (ss_string2[k], null_pointer_node, node);
-          node = tree_cons (ss_string2_len[k], integer_zero_node, node);
+          CONSTRUCTOR_APPEND_ELT (node, ss_string2[k], null_pointer_node);
+          CONSTRUCTOR_APPEND_ELT (node, ss_string2_len[k], integer_zero_node);
         }
       else
         {
           gfc_init_se (&se, NULL);
           gfc_conv_expr_reference (&se, d->high);
 
-          node = tree_cons (ss_string2[k], se.expr, node);
-          node = tree_cons (ss_string2_len[k], se.string_length, node);
+          CONSTRUCTOR_APPEND_ELT (node, ss_string2[k], se.expr);
+          CONSTRUCTOR_APPEND_ELT (node, ss_string2_len[k], se.string_length);
         }
 
-      node = tree_cons (ss_target[k], build_int_cst (integer_type_node, d->n),
-                       node);
+      CONSTRUCTOR_APPEND_ELT (node, ss_target[k],
+                              build_int_cst (integer_type_node, d->n));
 
-      tmp = build_constructor_from_list (select_struct[k], nreverse (node));
-      init = tree_cons (NULL_TREE, tmp, init);
+      tmp = build_constructor (select_struct[k], node);
+      CONSTRUCTOR_APPEND_ELT (inits, NULL_TREE, tmp);
     }
 
   type = build_array_type (select_struct[k],
                           build_index_type (build_int_cst (NULL_TREE, n-1)));
 
-  init = build_constructor_from_list (type, nreverse(init));
+  init = build_constructor (type, inits);
   TREE_CONSTANT (init) = 1;
   TREE_STATIC (init) = 1;
   /* Create a static variable to hold the jump table.  */
@@ -1737,11 +2045,6 @@ gfc_trans_character_select (gfc_code *code)
   /* Build the library call */
   init = gfc_build_addr_expr (pvoid_type_node, init);
 
-  gfc_init_se (&se, NULL);
-  gfc_conv_expr_reference (&se, code->expr1);
-
-  gfc_add_block_to_block (&block, &se.pre);
-
   if (code->expr1->ts.kind == 1)
     fndecl = gfor_fndecl_select_string;
   else if (code->expr1->ts.kind == 4)
@@ -1751,11 +2054,11 @@ gfc_trans_character_select (gfc_code *code)
 
   tmp = build_call_expr_loc (input_location,
                         fndecl, 4, init, build_int_cst (NULL_TREE, n),
-                        se.expr, se.string_length);
+                        expr1se.expr, expr1se.string_length);
   case_num = gfc_create_var (integer_type_node, "case_num");
   gfc_add_modify (&block, case_num, tmp);
 
-  gfc_add_block_to_block (&block, &se.post);
+  gfc_add_block_to_block (&block, &expr1se.post);
 
   tmp = gfc_finish_block (&body);
   tmp = build3_v (SWITCH_EXPR, case_num, tmp, NULL_TREE);
@@ -1785,22 +2088,47 @@ gfc_trans_character_select (gfc_code *code)
 tree
 gfc_trans_select (gfc_code * code)
 {
+  stmtblock_t block;
+  tree body;
+  tree exit_label;
+
   gcc_assert (code && code->expr1);
+  gfc_init_block (&block);
+
+  /* Build the exit label and hang it in.  */
+  exit_label = gfc_build_label_decl (NULL_TREE);
+  code->exit_label = exit_label;
 
   /* Empty SELECT constructs are legal.  */
   if (code->block == NULL)
-    return build_empty_stmt (input_location);
+    body = build_empty_stmt (input_location);
 
   /* Select the correct translation function.  */
-  switch (code->expr1->ts.type)
-    {
-    case BT_LOGICAL:   return gfc_trans_logical_select (code);
-    case BT_INTEGER:   return gfc_trans_integer_select (code);
-    case BT_CHARACTER: return gfc_trans_character_select (code);
-    default:
-      gfc_internal_error ("gfc_trans_select(): Bad type for case expr.");
-      /* Not reached */
-    }
+  else
+    switch (code->expr1->ts.type)
+      {
+      case BT_LOGICAL:
+       body = gfc_trans_logical_select (code);
+       break;
+
+      case BT_INTEGER:
+       body = gfc_trans_integer_select (code);
+       break;
+
+      case BT_CHARACTER:
+       body = gfc_trans_character_select (code);
+       break;
+
+      default:
+       gfc_internal_error ("gfc_trans_select(): Bad type for case expr.");
+       /* Not reached */
+      }
+
+  /* Build everything together.  */
+  gfc_add_expr_to_block (&block, body);
+  gfc_add_expr_to_block (&block, build1_v (LABEL_EXPR, exit_label));
+
+  return gfc_finish_block (&block);
 }
 
 
@@ -2060,18 +2388,19 @@ gfc_trans_forall_loop (forall_info *forall_tmp, tree body,
       gfc_init_block (&block);
 
       /* The exit condition.  */
-      cond = fold_build2 (LE_EXPR, boolean_type_node,
-                         count, build_int_cst (TREE_TYPE (count), 0));
+      cond = fold_build2_loc (input_location, LE_EXPR, boolean_type_node,
+                             count, build_int_cst (TREE_TYPE (count), 0));
       tmp = build1_v (GOTO_EXPR, exit_label);
-      tmp = fold_build3 (COND_EXPR, void_type_node,
-                        cond, tmp, build_empty_stmt (input_location));
+      tmp = fold_build3_loc (input_location, COND_EXPR, void_type_node,
+                            cond, tmp, build_empty_stmt (input_location));
       gfc_add_expr_to_block (&block, tmp);
 
       /* The main loop body.  */
       gfc_add_expr_to_block (&block, body);
 
       /* Increment the loop variable.  */
-      tmp = fold_build2 (PLUS_EXPR, TREE_TYPE (var), var, step);
+      tmp = fold_build2_loc (input_location, PLUS_EXPR, TREE_TYPE (var), var,
+                            step);
       gfc_add_modify (&block, var, tmp);
 
       /* Advance to the next mask element.  Only do this for the
@@ -2079,14 +2408,14 @@ gfc_trans_forall_loop (forall_info *forall_tmp, tree body,
       if (n == 0 && mask_flag && forall_tmp->mask)
        {
          tree maskindex = forall_tmp->maskindex;
-         tmp = fold_build2 (PLUS_EXPR, gfc_array_index_type,
-                            maskindex, gfc_index_one_node);
+         tmp = fold_build2_loc (input_location, PLUS_EXPR, gfc_array_index_type,
+                                maskindex, gfc_index_one_node);
          gfc_add_modify (&block, maskindex, tmp);
        }
 
       /* Decrement the loop counter.  */
-      tmp = fold_build2 (MINUS_EXPR, TREE_TYPE (var), count,
-                        build_int_cst (TREE_TYPE (var), 1));
+      tmp = fold_build2_loc (input_location, MINUS_EXPR, TREE_TYPE (var), count,
+                            build_int_cst (TREE_TYPE (var), 1));
       gfc_add_modify (&block, count, tmp);
 
       body = gfc_finish_block (&block);
@@ -2097,9 +2426,12 @@ gfc_trans_forall_loop (forall_info *forall_tmp, tree body,
 
 
       /* Initialize the loop counter.  */
-      tmp = fold_build2 (MINUS_EXPR, TREE_TYPE (var), step, start);
-      tmp = fold_build2 (PLUS_EXPR, TREE_TYPE (var), end, tmp);
-      tmp = fold_build2 (TRUNC_DIV_EXPR, TREE_TYPE (var), tmp, step);
+      tmp = fold_build2_loc (input_location, MINUS_EXPR, TREE_TYPE (var), step,
+                            start);
+      tmp = fold_build2_loc (input_location, PLUS_EXPR, TREE_TYPE (var), end,
+                            tmp);
+      tmp = fold_build2_loc (input_location, TRUNC_DIV_EXPR, TREE_TYPE (var),
+                            tmp, step);
       gfc_add_modify (&block, count, tmp);
 
       /* The loop expression.  */
@@ -2172,10 +2504,8 @@ gfc_do_allocate (tree bytesize, tree size, tree * pdata, stmtblock_t * pblock,
   tree tmp;
 
   if (INTEGER_CST_P (size))
-    {
-      tmp = fold_build2 (MINUS_EXPR, gfc_array_index_type, size,
-                        gfc_index_one_node);
-    }
+    tmp = fold_build2_loc (input_location, MINUS_EXPR, gfc_array_index_type,
+                          size, gfc_index_one_node);
   else
     tmp = NULL_TREE;
 
@@ -2233,8 +2563,8 @@ generate_loop_for_temp_to_lhs (gfc_expr *expr, tree tmp1, tree count3,
       gfc_add_block_to_block (&block, &lse.post);
 
       /* Increment the count1.  */
-      tmp = fold_build2 (PLUS_EXPR, TREE_TYPE (count1), count1,
-                        gfc_index_one_node);
+      tmp = fold_build2_loc (input_location, PLUS_EXPR, TREE_TYPE (count1),
+                            count1, gfc_index_one_node);
       gfc_add_modify (&block, count1, tmp);
 
       tmp = gfc_finish_block (&block);
@@ -2279,26 +2609,27 @@ generate_loop_for_temp_to_lhs (gfc_expr *expr, tree tmp1, tree count3,
        {
          wheremaskexpr = gfc_build_array_ref (wheremask, count3, NULL);
          if (invert)
-           wheremaskexpr = fold_build1 (TRUTH_NOT_EXPR,
-                                        TREE_TYPE (wheremaskexpr),
-                                        wheremaskexpr);
-         tmp = fold_build3 (COND_EXPR, void_type_node,
-                            wheremaskexpr, tmp,
-                            build_empty_stmt (input_location));
+           wheremaskexpr = fold_build1_loc (input_location, TRUTH_NOT_EXPR,
+                                            TREE_TYPE (wheremaskexpr),
+                                            wheremaskexpr);
+         tmp = fold_build3_loc (input_location, COND_EXPR, void_type_node,
+                                wheremaskexpr, tmp,
+                                build_empty_stmt (input_location));
        }
 
       gfc_add_expr_to_block (&body, tmp);
 
       /* Increment count1.  */
-      tmp = fold_build2 (PLUS_EXPR, gfc_array_index_type,
-                        count1, gfc_index_one_node);
+      tmp = fold_build2_loc (input_location, PLUS_EXPR, gfc_array_index_type,
+                            count1, gfc_index_one_node);
       gfc_add_modify (&body, count1, tmp);
 
       /* Increment count3.  */
       if (count3)
        {
-         tmp = fold_build2 (PLUS_EXPR, gfc_array_index_type,
-                            count3, gfc_index_one_node);
+         tmp = fold_build2_loc (input_location, PLUS_EXPR,
+                                gfc_array_index_type, count3,
+                                gfc_index_one_node);
          gfc_add_modify (&body, count3, tmp);
        }
 
@@ -2377,11 +2708,12 @@ generate_loop_for_rhs_to_temp (gfc_expr *expr2, tree tmp1, tree count3,
     {
       wheremaskexpr = gfc_build_array_ref (wheremask, count3, NULL);
       if (invert)
-       wheremaskexpr = fold_build1 (TRUTH_NOT_EXPR,
-                                    TREE_TYPE (wheremaskexpr),
-                                    wheremaskexpr);
-      tmp = fold_build3 (COND_EXPR, void_type_node,
-                        wheremaskexpr, tmp, build_empty_stmt (input_location));
+       wheremaskexpr = fold_build1_loc (input_location, TRUTH_NOT_EXPR,
+                                        TREE_TYPE (wheremaskexpr),
+                                        wheremaskexpr);
+      tmp = fold_build3_loc (input_location, COND_EXPR, void_type_node,
+                            wheremaskexpr, tmp,
+                            build_empty_stmt (input_location));
     }
 
   gfc_add_expr_to_block (&body1, tmp);
@@ -2391,22 +2723,23 @@ generate_loop_for_rhs_to_temp (gfc_expr *expr2, tree tmp1, tree count3,
       gfc_add_block_to_block (&block, &body1);
 
       /* Increment count1.  */
-      tmp = fold_build2 (PLUS_EXPR, TREE_TYPE (count1), count1,
-                        gfc_index_one_node);
+      tmp = fold_build2_loc (input_location, PLUS_EXPR, TREE_TYPE (count1),
+                            count1, gfc_index_one_node);
       gfc_add_modify (&block, count1, tmp);
     }
   else
     {
       /* Increment count1.  */
-      tmp = fold_build2 (PLUS_EXPR, gfc_array_index_type,
-                        count1, gfc_index_one_node);
+      tmp = fold_build2_loc (input_location, PLUS_EXPR, gfc_array_index_type,
+                            count1, gfc_index_one_node);
       gfc_add_modify (&body1, count1, tmp);
 
       /* Increment count3.  */
       if (count3)
        {
-         tmp = fold_build2 (PLUS_EXPR, gfc_array_index_type,
-                            count3, gfc_index_one_node);
+         tmp = fold_build2_loc (input_location, PLUS_EXPR,
+                                gfc_array_index_type,
+                                count3, gfc_index_one_node);
          gfc_add_modify (&body1, count3, tmp);
        }
 
@@ -2479,11 +2812,13 @@ compute_inner_temp_size (gfc_expr *expr1, gfc_expr *expr2,
       /* Figure out how many elements we need.  */
       for (i = 0; i < loop.dimen; i++)
         {
-         tmp = fold_build2 (MINUS_EXPR, gfc_array_index_type,
-                            gfc_index_one_node, loop.from[i]);
-          tmp = fold_build2 (PLUS_EXPR, gfc_array_index_type,
-                            tmp, loop.to[i]);
-          size = fold_build2 (MULT_EXPR, gfc_array_index_type, size, tmp);
+         tmp = fold_build2_loc (input_location, MINUS_EXPR,
+                                gfc_array_index_type,
+                                gfc_index_one_node, loop.from[i]);
+          tmp = fold_build2_loc (input_location, PLUS_EXPR,
+                                gfc_array_index_type, tmp, loop.to[i]);
+          size = fold_build2_loc (input_location, MULT_EXPR,
+                                 gfc_array_index_type, size, tmp);
         }
       gfc_add_block_to_block (pblock, &loop.pre);
       size = gfc_evaluate_now (size, pblock);
@@ -2521,8 +2856,9 @@ compute_overall_iter_number (forall_info *nested_forall_info, tree inner_size,
             && !forall_tmp->mask 
             && INTEGER_CST_P (forall_tmp->size))
        {
-         inner_size = fold_build2 (MULT_EXPR, gfc_array_index_type,
-                                   inner_size, forall_tmp->size);
+         inner_size = fold_build2_loc (input_location, MULT_EXPR,
+                                       gfc_array_index_type,
+                                       inner_size, forall_tmp->size);
          forall_tmp = forall_tmp->prev_nest;
        }
 
@@ -2539,8 +2875,8 @@ compute_overall_iter_number (forall_info *nested_forall_info, tree inner_size,
   if (inner_size_body)
     gfc_add_block_to_block (&body, inner_size_body);
   if (forall_tmp)
-    tmp = fold_build2 (PLUS_EXPR, gfc_array_index_type,
-                      number, inner_size);
+    tmp = fold_build2_loc (input_location, PLUS_EXPR,
+                          gfc_array_index_type, number, inner_size);
   else
     tmp = inner_size;
   gfc_add_modify (&body, number, tmp);
@@ -2569,7 +2905,8 @@ allocate_temp_for_forall_nest_1 (tree type, tree size, stmtblock_t * block,
 
   unit = fold_convert (gfc_array_index_type, TYPE_SIZE_UNIT (type));
   if (!integer_onep (unit))
-    bytesize = fold_build2 (MULT_EXPR, gfc_array_index_type, size, unit);
+    bytesize = fold_build2_loc (input_location, MULT_EXPR,
+                               gfc_array_index_type, size, unit);
   else
     bytesize = size;
 
@@ -2771,8 +3108,8 @@ gfc_trans_pointer_assign_need_temp (gfc_expr * expr1, gfc_expr * expr2,
       gfc_add_block_to_block (&body, &rse.post);
 
       /* Increment count.  */
-      tmp = fold_build2 (PLUS_EXPR, gfc_array_index_type,
-                        count, gfc_index_one_node);
+      tmp = fold_build2_loc (input_location, PLUS_EXPR, gfc_array_index_type,
+                            count, gfc_index_one_node);
       gfc_add_modify (&body, count, tmp);
 
       tmp = gfc_finish_block (&body);
@@ -2795,8 +3132,8 @@ gfc_trans_pointer_assign_need_temp (gfc_expr * expr1, gfc_expr * expr2,
       gfc_add_modify (&body, lse.expr, rse.expr);
       gfc_add_block_to_block (&body, &lse.post);
       /* Increment count.  */
-      tmp = fold_build2 (PLUS_EXPR, gfc_array_index_type,
-                        count, gfc_index_one_node);
+      tmp = fold_build2_loc (input_location, PLUS_EXPR, gfc_array_index_type,
+                            count, gfc_index_one_node);
       gfc_add_modify (&body, count, tmp);
       tmp = gfc_finish_block (&body);
 
@@ -2840,8 +3177,8 @@ gfc_trans_pointer_assign_need_temp (gfc_expr * expr1, gfc_expr * expr2,
       gfc_add_block_to_block (&body, &lse.post);
 
       /* Increment count.  */
-      tmp = fold_build2 (PLUS_EXPR, gfc_array_index_type,
-                        count, gfc_index_one_node);
+      tmp = fold_build2_loc (input_location, PLUS_EXPR, gfc_array_index_type,
+                            count, gfc_index_one_node);
       gfc_add_modify (&body, count, tmp);
 
       tmp = gfc_finish_block (&body);
@@ -2864,8 +3201,8 @@ gfc_trans_pointer_assign_need_temp (gfc_expr * expr1, gfc_expr * expr2,
       gfc_add_block_to_block (&body, &lse.post);
 
       /* Increment count.  */
-      tmp = fold_build2 (PLUS_EXPR, gfc_array_index_type,
-                        count, gfc_index_one_node);
+      tmp = fold_build2_loc (input_location, PLUS_EXPR, gfc_array_index_type,
+                            count, gfc_index_one_node);
       gfc_add_modify (&body, count, tmp);
 
       tmp = gfc_finish_block (&body);
@@ -3041,14 +3378,16 @@ gfc_trans_forall_1 (gfc_code * code, forall_info * nested_forall_info)
   for (n = 0; n < nvar; n++)
     {
       /* size = (end + step - start) / step.  */
-      tmp = fold_build2 (MINUS_EXPR, TREE_TYPE (start[n]), 
-                        step[n], start[n]);
-      tmp = fold_build2 (PLUS_EXPR, TREE_TYPE (end[n]), end[n], tmp);
-
-      tmp = fold_build2 (FLOOR_DIV_EXPR, TREE_TYPE (tmp), tmp, step[n]);
+      tmp = fold_build2_loc (input_location, MINUS_EXPR, TREE_TYPE (start[n]), 
+                            step[n], start[n]);
+      tmp = fold_build2_loc (input_location, PLUS_EXPR, TREE_TYPE (end[n]),
+                            end[n], tmp);
+      tmp = fold_build2_loc (input_location, FLOOR_DIV_EXPR, TREE_TYPE (tmp),
+                            tmp, step[n]);
       tmp = convert (gfc_array_index_type, tmp);
 
-      size = fold_build2 (MULT_EXPR, gfc_array_index_type, size, tmp);
+      size = fold_build2_loc (input_location, MULT_EXPR, gfc_array_index_type,
+                             size, tmp);
     }
 
   /* Record the nvar and size of current forall level.  */
@@ -3115,8 +3454,8 @@ gfc_trans_forall_1 (gfc_code * code, forall_info * nested_forall_info)
       gfc_add_modify (&body, tmp, se.expr);
 
       /* Advance to the next mask element.  */
-      tmp = fold_build2 (PLUS_EXPR, gfc_array_index_type,
-                        maskindex, gfc_index_one_node);
+      tmp = fold_build2_loc (input_location, PLUS_EXPR, gfc_array_index_type,
+                            maskindex, gfc_index_one_node);
       gfc_add_modify (&body, maskindex, tmp);
 
       /* Generate the loops.  */
@@ -3217,6 +3556,13 @@ gfc_trans_forall_1 (gfc_code * code, forall_info * nested_forall_info)
   gfc_free (varexpr);
   gfc_free (saved_vars);
 
+  for (this_forall = info->this_loop; this_forall;)
+    {
+      iter_info *next = this_forall->next;
+      gfc_free (this_forall);
+      this_forall = next;
+    }
+
   /* Free the space for this forall_info.  */
   gfc_free (info);
 
@@ -3323,7 +3669,7 @@ gfc_evaluate_where_mask (gfc_expr * me, forall_info * nested_forall_info,
     {
       tmp = gfc_build_array_ref (mask, count, NULL);
       if (invert)
-       tmp = fold_build1 (TRUTH_NOT_EXPR, mask_type, tmp);
+       tmp = fold_build1_loc (input_location, TRUTH_NOT_EXPR, mask_type, tmp);
       gfc_add_modify (&body1, mtmp, tmp);
     }
 
@@ -3332,16 +3678,18 @@ gfc_evaluate_where_mask (gfc_expr * me, forall_info * nested_forall_info,
       tmp1 = gfc_build_array_ref (cmask, count, NULL);
       tmp = cond;
       if (mask)
-       tmp = fold_build2 (TRUTH_AND_EXPR, mask_type, mtmp, tmp);
+       tmp = fold_build2_loc (input_location, TRUTH_AND_EXPR, mask_type,
+                              mtmp, tmp);
       gfc_add_modify (&body1, tmp1, tmp);
     }
 
   if (pmask)
     {
       tmp1 = gfc_build_array_ref (pmask, count, NULL);
-      tmp = fold_build1 (TRUTH_NOT_EXPR, mask_type, cond);
+      tmp = fold_build1_loc (input_location, TRUTH_NOT_EXPR, mask_type, cond);
       if (mask)
-       tmp = fold_build2 (TRUTH_AND_EXPR, mask_type, mtmp, tmp);
+       tmp = fold_build2_loc (input_location, TRUTH_AND_EXPR, mask_type, mtmp,
+                              tmp);
       gfc_add_modify (&body1, tmp1, tmp);
     }
 
@@ -3355,8 +3703,8 @@ gfc_evaluate_where_mask (gfc_expr * me, forall_info * nested_forall_info,
   else
     {
       /* Increment count.  */
-      tmp1 = fold_build2 (PLUS_EXPR, gfc_array_index_type, count,
-                          gfc_index_one_node);
+      tmp1 = fold_build2_loc (input_location, PLUS_EXPR, gfc_array_index_type,
+                             count, gfc_index_one_node);
       gfc_add_modify (&body1, count, tmp1);
 
       /* Generate the copying loops.  */
@@ -3493,10 +3841,7 @@ gfc_trans_where_assign (gfc_expr *expr1, gfc_expr *expr2,
   /* Translate the expression.  */
   gfc_conv_expr (&rse, expr2);
   if (lss != gfc_ss_terminator && loop.temp_ss != NULL)
-    {
-      gfc_conv_tmp_array_ref (&lse);
-      gfc_advance_se_ss_chain (&lse);
-    }
+    gfc_conv_tmp_array_ref (&lse);
   else
     gfc_conv_expr (&lse, expr1);
 
@@ -3504,7 +3849,8 @@ gfc_trans_where_assign (gfc_expr *expr1, gfc_expr *expr2,
   index = count1;
   maskexpr = gfc_build_array_ref (mask, index, NULL);
   if (invert)
-    maskexpr = fold_build1 (TRUTH_NOT_EXPR, TREE_TYPE (maskexpr), maskexpr);
+    maskexpr = fold_build1_loc (input_location, TRUTH_NOT_EXPR,
+                               TREE_TYPE (maskexpr), maskexpr);
 
   /* Use the scalar assignment as is.  */
   tmp = gfc_trans_scalar_assign (&lse, &rse, expr1->ts,
@@ -3517,8 +3863,8 @@ gfc_trans_where_assign (gfc_expr *expr1, gfc_expr *expr2,
   if (lss == gfc_ss_terminator)
     {
       /* Increment count1.  */
-      tmp = fold_build2 (PLUS_EXPR, gfc_array_index_type,
-                        count1, gfc_index_one_node);
+      tmp = fold_build2_loc (input_location, PLUS_EXPR, gfc_array_index_type,
+                            count1, gfc_index_one_node);
       gfc_add_modify (&body, count1, tmp);
 
       /* Use the scalar assignment as is.  */
@@ -3533,8 +3879,8 @@ gfc_trans_where_assign (gfc_expr *expr1, gfc_expr *expr2,
         {
           /* Increment count1 before finish the main body of a scalarized
              expression.  */
-          tmp = fold_build2 (PLUS_EXPR, gfc_array_index_type,
-                            count1, gfc_index_one_node);
+          tmp = fold_build2_loc (input_location, PLUS_EXPR,
+                                gfc_array_index_type, count1, gfc_index_one_node);
           gfc_add_modify (&body, count1, tmp);
           gfc_trans_scalarized_loop_boundary (&loop, &body);
 
@@ -3548,7 +3894,6 @@ gfc_trans_where_assign (gfc_expr *expr1, gfc_expr *expr2,
           lse.ss = lss;
 
           gfc_conv_tmp_array_ref (&rse);
-          gfc_advance_se_ss_chain (&rse);
           gfc_conv_expr (&lse, expr1);
 
           gcc_assert (lse.ss == gfc_ss_terminator
@@ -3558,8 +3903,8 @@ gfc_trans_where_assign (gfc_expr *expr1, gfc_expr *expr2,
           index = count2;
           maskexpr = gfc_build_array_ref (mask, index, NULL);
          if (invert)
-           maskexpr = fold_build1 (TRUTH_NOT_EXPR, TREE_TYPE (maskexpr),
-                                   maskexpr);
+           maskexpr = fold_build1_loc (input_location, TRUTH_NOT_EXPR,
+                                       TREE_TYPE (maskexpr), maskexpr);
 
           /* Use the scalar assignment as is.  */
           tmp = gfc_trans_scalar_assign (&lse, &rse, expr1->ts, false, false,
@@ -3569,15 +3914,17 @@ gfc_trans_where_assign (gfc_expr *expr1, gfc_expr *expr2,
           gfc_add_expr_to_block (&body, tmp);
 
           /* Increment count2.  */
-          tmp = fold_build2 (PLUS_EXPR, gfc_array_index_type,
-                            count2, gfc_index_one_node);
+          tmp = fold_build2_loc (input_location, PLUS_EXPR,
+                                gfc_array_index_type, count2,
+                                gfc_index_one_node);
           gfc_add_modify (&body, count2, tmp);
         }
       else
         {
           /* Increment count1.  */
-          tmp = fold_build2 (PLUS_EXPR, gfc_array_index_type,
-                            count1, gfc_index_one_node);
+          tmp = fold_build2_loc (input_location, PLUS_EXPR,
+                                gfc_array_index_type, count1,
+                                gfc_index_one_node);
           gfc_add_modify (&body, count1, tmp);
         }
 
@@ -3674,15 +4021,18 @@ gfc_trans_where_2 (gfc_code * code, tree mask, bool invert,
       inner_size = compute_inner_temp_size (cblock->expr1, cblock->expr1,
                                            &inner_size_body, &lss, &rss);
 
+      gfc_free_ss_chain (lss);
+      gfc_free_ss_chain (rss);
+
       /* Calculate the total size of temporary needed.  */
       size = compute_overall_iter_number (nested_forall_info, inner_size,
                                          &inner_size_body, block);
 
       /* Check whether the size is negative.  */
-      cond = fold_build2 (LE_EXPR, boolean_type_node, size,
-                         gfc_index_zero_node);
-      size = fold_build3 (COND_EXPR, gfc_array_index_type, cond,
-                         gfc_index_zero_node, size);
+      cond = fold_build2_loc (input_location, LE_EXPR, boolean_type_node, size,
+                             gfc_index_zero_node);
+      size = fold_build3_loc (input_location, COND_EXPR, gfc_array_index_type,
+                             cond, gfc_index_zero_node, size);
       size = gfc_evaluate_now (size, block);
 
       /* Allocate temporary for WHERE mask if needed.  */
@@ -3951,10 +4301,7 @@ gfc_trans_where_3 (gfc_code * cblock, gfc_code * eblock)
 
   gfc_conv_expr (&tsse, tsrc);
   if (tdss != gfc_ss_terminator && loop.temp_ss != NULL)
-    {
-      gfc_conv_tmp_array_ref (&tdse);
-      gfc_advance_se_ss_chain (&tdse);
-    }
+    gfc_conv_tmp_array_ref (&tdse);
   else
     gfc_conv_expr (&tdse, tdst);
 
@@ -3962,12 +4309,9 @@ gfc_trans_where_3 (gfc_code * cblock, gfc_code * eblock)
     {
       gfc_conv_expr (&esse, esrc);
       if (edss != gfc_ss_terminator && loop.temp_ss != NULL)
-        {
-          gfc_conv_tmp_array_ref (&edse);
-          gfc_advance_se_ss_chain (&edse);
-        }
+       gfc_conv_tmp_array_ref (&edse);
       else
-        gfc_conv_expr (&edse, edst);
+       gfc_conv_expr (&edse, edst);
     }
 
   tstmt = gfc_trans_scalar_assign (&tdse, &tsse, tdst->ts, false, false, true);
@@ -4067,7 +4411,9 @@ gfc_trans_cycle (gfc_code * code)
 {
   tree cycle_label;
 
-  cycle_label = TREE_PURPOSE (code->ext.whichloop->backend_decl);
+  cycle_label = code->ext.which_construct->cycle_label;
+  gcc_assert (cycle_label);
+
   TREE_USED (cycle_label) = 1;
   return build1_v (GOTO_EXPR, cycle_label);
 }
@@ -4082,7 +4428,9 @@ gfc_trans_exit (gfc_code * code)
 {
   tree exit_label;
 
-  exit_label = TREE_VALUE (code->ext.whichloop->backend_decl);
+  exit_label = code->ext.which_construct->exit_label;
+  gcc_assert (exit_label);
+
   TREE_USED (exit_label) = 1;
   return build1_v (GOTO_EXPR, exit_label);
 }
@@ -4128,7 +4476,7 @@ gfc_trans_allocate (gfc_code * code)
       expr = gfc_copy_expr (al->expr);
 
       if (expr->ts.type == BT_CLASS)
-       gfc_add_component_ref (expr, "$data");
+       gfc_add_data_component (expr);
 
       gfc_init_se (&se, NULL);
       gfc_start_block (&se.pre);
@@ -4142,20 +4490,23 @@ gfc_trans_allocate (gfc_code * code)
          /* A scalar or derived type.  */
 
          /* Determine allocate size.  */
-         if (code->expr3 && code->expr3->ts.type == BT_CLASS)
+         if (al->expr->ts.type == BT_CLASS && code->expr3)
            {
-             gfc_expr *sz;
-             gfc_se se_sz;
-             sz = gfc_copy_expr (code->expr3);
-             gfc_add_component_ref (sz, "$vptr");
-             gfc_add_component_ref (sz, "$size");
-             gfc_init_se (&se_sz, NULL);
-             gfc_conv_expr (&se_sz, sz);
-             gfc_free_expr (sz);
-             memsz = se_sz.expr;
+             if (code->expr3->ts.type == BT_CLASS)
+               {
+                 gfc_expr *sz;
+                 gfc_se se_sz;
+                 sz = gfc_copy_expr (code->expr3);
+                 gfc_add_vptr_component (sz);
+                 gfc_add_size_component (sz);
+                 gfc_init_se (&se_sz, NULL);
+                 gfc_conv_expr (&se_sz, sz);
+                 gfc_free_expr (sz);
+                 memsz = se_sz.expr;
+               }
+             else
+               memsz = TYPE_SIZE_UNIT (gfc_typenode_for_spec (&code->expr3->ts));
            }
-         else if (code->expr3 && code->expr3->ts.type != BT_CLASS)
-           memsz = TYPE_SIZE_UNIT (gfc_typenode_for_spec (&code->expr3->ts));
          else if (code->ext.alloc.ts.type != BT_UNKNOWN)
            memsz = TYPE_SIZE_UNIT (gfc_typenode_for_spec (&code->ext.alloc.ts));
          else
@@ -4190,17 +4541,20 @@ gfc_trans_allocate (gfc_code * code)
              tmp = gfc_allocate_with_status (&se.pre, memsz, pstat);
          }
 
-         tmp = fold_build2 (MODIFY_EXPR, void_type_node, se.expr,
-                            fold_convert (TREE_TYPE (se.expr), tmp));
+         tmp = fold_build2_loc (input_location, MODIFY_EXPR, void_type_node,
+                                se.expr,
+                                fold_convert (TREE_TYPE (se.expr), tmp));
          gfc_add_expr_to_block (&se.pre, tmp);
 
          if (code->expr1 || code->expr2)
            {
              tmp = build1_v (GOTO_EXPR, error_label);
-             parm = fold_build2 (NE_EXPR, boolean_type_node,
-                                 stat, build_int_cst (TREE_TYPE (stat), 0));
-             tmp = fold_build3 (COND_EXPR, void_type_node,
-                                parm, tmp, build_empty_stmt (input_location));
+             parm = fold_build2_loc (input_location, NE_EXPR,
+                                     boolean_type_node, stat,
+                                     build_int_cst (TREE_TYPE (stat), 0));
+             tmp = fold_build3_loc (input_location, COND_EXPR, void_type_node,
+                                    parm, tmp,
+                                    build_empty_stmt (input_location));
              gfc_add_expr_to_block (&se.pre, tmp);
            }
 
@@ -4216,21 +4570,38 @@ gfc_trans_allocate (gfc_code * code)
       tmp = gfc_finish_block (&se.pre);
       gfc_add_expr_to_block (&block, tmp);
 
-      /* Initialization via SOURCE block.  */
-      if (code->expr3)
+      if (code->expr3 && !code->expr3->mold)
        {
+         /* Initialization via SOURCE block
+            (or static default initializer).  */
          gfc_expr *rhs = gfc_copy_expr (code->expr3);
          if (al->expr->ts.type == BT_CLASS)
            {
-             gfc_se dst,src;
+             gfc_se call;
+             gfc_actual_arglist *actual;
+             gfc_expr *ppc;
+             gfc_init_se (&call, NULL);
+             /* Do a polymorphic deep copy.  */
+             actual = gfc_get_actual_arglist ();
+             actual->expr = gfc_copy_expr (rhs);
              if (rhs->ts.type == BT_CLASS)
-               gfc_add_component_ref (rhs, "$data");
-             gfc_init_se (&dst, NULL);
-             gfc_init_se (&src, NULL);
-             gfc_conv_expr (&dst, expr);
-             gfc_conv_expr (&src, rhs);
-             gfc_add_block_to_block (&block, &src.pre);
-             tmp = gfc_build_memcpy_call (dst.expr, src.expr, memsz);
+               gfc_add_data_component (actual->expr);
+             actual->next = gfc_get_actual_arglist ();
+             actual->next->expr = gfc_copy_expr (al->expr);
+             gfc_add_data_component (actual->next->expr);
+             if (rhs->ts.type == BT_CLASS)
+               {
+                 ppc = gfc_copy_expr (rhs);
+                 gfc_add_vptr_component (ppc);
+               }
+             else
+               ppc = gfc_lval_expr_from_sym (gfc_find_derived_vtab (rhs->ts.u.derived));
+             gfc_add_component_ref (ppc, "_copy");
+             gfc_conv_procedure_call (&call, ppc->symtree->n.sym, actual,
+                                       ppc, NULL);
+             gfc_add_expr_to_block (&call.pre, call.expr);
+             gfc_add_block_to_block (&call.pre, &call.post);
+             tmp = gfc_finish_block (&call.pre);
            }
          else
            tmp = gfc_trans_assignment (gfc_expr_to_initialize (expr),
@@ -4238,6 +4609,23 @@ gfc_trans_allocate (gfc_code * code)
          gfc_free_expr (rhs);
          gfc_add_expr_to_block (&block, tmp);
        }
+      else if (code->expr3 && code->expr3->mold
+           && code->expr3->ts.type == BT_CLASS)
+       {
+         /* Default-initialization via MOLD (polymorphic).  */
+         gfc_expr *rhs = gfc_copy_expr (code->expr3);
+         gfc_se dst,src;
+         gfc_add_vptr_component (rhs);
+         gfc_add_def_init_component (rhs);
+         gfc_init_se (&dst, NULL);
+         gfc_init_se (&src, NULL);
+         gfc_conv_expr (&dst, expr);
+         gfc_conv_expr (&src, rhs);
+         gfc_add_block_to_block (&block, &src.pre);
+         tmp = gfc_build_memcpy_call (dst.expr, src.expr, memsz);
+         gfc_add_expr_to_block (&block, tmp);
+         gfc_free_expr (rhs);
+       }
 
       /* Allocation of CLASS entities.  */
       gfc_free_expr (expr);
@@ -4249,13 +4637,13 @@ gfc_trans_allocate (gfc_code * code)
 
          /* Initialize VPTR for CLASS objects.  */
          lhs = gfc_expr_to_initialize (expr);
-         gfc_add_component_ref (lhs, "$vptr");
+         gfc_add_vptr_component (lhs);
          rhs = NULL;
          if (code->expr3 && code->expr3->ts.type == BT_CLASS)
            {
-             /* VPTR must be determined at run time.  */
+             /* Polymorphic SOURCE: VPTR must be determined at run time.  */
              rhs = gfc_copy_expr (code->expr3);
-             gfc_add_component_ref (rhs, "$vptr");
+             gfc_add_vptr_component (rhs);
              tmp = gfc_trans_pointer_assignment (lhs, rhs);
              gfc_add_expr_to_block (&block, tmp);
              gfc_free_expr (rhs);
@@ -4272,15 +4660,14 @@ gfc_trans_allocate (gfc_code * code)
              else if (code->ext.alloc.ts.type == BT_DERIVED)
                ts = &code->ext.alloc.ts;
              else if (expr->ts.type == BT_CLASS)
-               ts = &expr->ts.u.derived->components->ts;
+               ts = &CLASS_DATA (expr)->ts;
              else
                ts = &expr->ts;
 
              if (ts->type == BT_DERIVED)
                {
-                 vtab = gfc_find_derived_vtab (ts->u.derived, true);
+                 vtab = gfc_find_derived_vtab (ts->u.derived);
                  gcc_assert (vtab);
-                 gfc_trans_assign_vtab_procs (&block, ts->u.derived, vtab);
                  gfc_init_se (&lse, NULL);
                  lse.want_pointer = 1;
                  gfc_conv_expr (&lse, lhs);
@@ -4290,6 +4677,7 @@ gfc_trans_allocate (gfc_code * code)
                        fold_convert (TREE_TYPE (lse.expr), tmp));
                }
            }
+         gfc_free_expr (lhs);
        }
 
     }
@@ -4324,14 +4712,15 @@ gfc_trans_allocate (gfc_code * code)
 
       slen = build_int_cst (gfc_charlen_type_node, ((int) strlen (msg)));
       dlen = gfc_get_expr_charlen (code->expr2);
-      slen = fold_build2 (MIN_EXPR, TREE_TYPE (slen), dlen, slen);
+      slen = fold_build2_loc (input_location, MIN_EXPR, TREE_TYPE (slen), dlen,
+                             slen);
 
       dlen = build_call_expr_loc (input_location,
                              built_in_decls[BUILT_IN_MEMCPY], 3,
                gfc_build_addr_expr (pvoid_type_node, se.expr), errmsg, slen);
 
-      tmp = fold_build2 (NE_EXPR, boolean_type_node, stat,
-                        build_int_cst (TREE_TYPE (stat), 0));
+      tmp = fold_build2_loc (input_location, NE_EXPR, boolean_type_node, stat,
+                            build_int_cst (TREE_TYPE (stat), 0));
 
       tmp = build3_v (COND_EXPR, tmp, dlen, build_empty_stmt (input_location));
 
@@ -4349,7 +4738,6 @@ gfc_trans_deallocate (gfc_code *code)
 {
   gfc_se se;
   gfc_alloc *al;
-  gfc_expr *expr;
   tree apstat, astat, pstat, stat, tmp;
   stmtblock_t block;
 
@@ -4377,9 +4765,12 @@ gfc_trans_deallocate (gfc_code *code)
 
   for (al = code->ext.alloc.list; al != NULL; al = al->next)
     {
-      expr = al->expr;
+      gfc_expr *expr = gfc_copy_expr (al->expr);
       gcc_assert (expr->expr_type == EXPR_VARIABLE);
 
+      if (expr->ts.type == BT_CLASS)
+       gfc_add_data_component (expr);
+
       gfc_init_se (&se, NULL);
       gfc_start_block (&se.pre);
 
@@ -4387,49 +4778,67 @@ gfc_trans_deallocate (gfc_code *code)
       se.descriptor_only = 1;
       gfc_conv_expr (&se, expr);
 
-      if (expr->ts.type == BT_DERIVED && expr->ts.u.derived->attr.alloc_comp)
-        {
-         gfc_ref *ref;
-         gfc_ref *last = NULL;
-         for (ref = expr->ref; ref; ref = ref->next)
-           if (ref->type == REF_COMPONENT)
-             last = ref;
-
-         /* Do not deallocate the components of a derived type
-            ultimate pointer component.  */
-         if (!(last && last->u.c.component->attr.pointer)
-               && !(!last && expr->symtree->n.sym->attr.pointer))
+      if (expr->rank)
+       {
+         if (expr->ts.type == BT_DERIVED && expr->ts.u.derived->attr.alloc_comp)
            {
-             tmp = gfc_deallocate_alloc_comp (expr->ts.u.derived, se.expr,
-                                              expr->rank);
-             gfc_add_expr_to_block (&se.pre, tmp);
+             gfc_ref *ref;
+             gfc_ref *last = NULL;
+             for (ref = expr->ref; ref; ref = ref->next)
+               if (ref->type == REF_COMPONENT)
+                 last = ref;
+
+             /* Do not deallocate the components of a derived type
+               ultimate pointer component.  */
+             if (!(last && last->u.c.component->attr.pointer)
+                   && !(!last && expr->symtree->n.sym->attr.pointer))
+               {
+                 tmp = gfc_deallocate_alloc_comp (expr->ts.u.derived, se.expr,
+                                                 expr->rank);
+                 gfc_add_expr_to_block (&se.pre, tmp);
+               }
            }
+         tmp = gfc_array_deallocate (se.expr, pstat, expr);
+         gfc_add_expr_to_block (&se.pre, tmp);
        }
-
-      if (expr->rank)
-       tmp = gfc_array_deallocate (se.expr, pstat, expr);
       else
        {
-         tmp = gfc_deallocate_with_status (se.expr, pstat, false, expr);
+         tmp = gfc_deallocate_scalar_with_status (se.expr, pstat, false,
+                                                  expr, expr->ts);
          gfc_add_expr_to_block (&se.pre, tmp);
 
-         tmp = fold_build2 (MODIFY_EXPR, void_type_node,
-                            se.expr, build_int_cst (TREE_TYPE (se.expr), 0));
+         /* Set to zero after deallocation.  */
+         tmp = fold_build2_loc (input_location, MODIFY_EXPR, void_type_node,
+                                se.expr,
+                                build_int_cst (TREE_TYPE (se.expr), 0));
+         gfc_add_expr_to_block (&se.pre, tmp);
+         
+         if (al->expr->ts.type == BT_CLASS)
+           {
+             /* Reset _vptr component to declared type.  */
+             gfc_expr *rhs, *lhs = gfc_copy_expr (al->expr);
+             gfc_symbol *vtab = gfc_find_derived_vtab (al->expr->ts.u.derived);
+             gfc_add_vptr_component (lhs);
+             rhs = gfc_lval_expr_from_sym (vtab);
+             tmp = gfc_trans_pointer_assignment (lhs, rhs);
+             gfc_add_expr_to_block (&se.pre, tmp);
+             gfc_free_expr (lhs);
+             gfc_free_expr (rhs);
+           }
        }
 
-      gfc_add_expr_to_block (&se.pre, tmp);
-
       /* Keep track of the number of failed deallocations by adding stat
         of the last deallocation to the running total.  */
       if (code->expr1 || code->expr2)
        {
-         apstat = fold_build2 (PLUS_EXPR, TREE_TYPE (stat), astat, stat);
+         apstat = fold_build2_loc (input_location, PLUS_EXPR,
+                                   TREE_TYPE (stat), astat, stat);
          gfc_add_modify (&se.pre, astat, apstat);
        }
 
       tmp = gfc_finish_block (&se.pre);
       gfc_add_expr_to_block (&block, tmp);
-
+      gfc_free_expr (expr);
     }
 
   /* Set STAT.  */
@@ -4459,14 +4868,15 @@ gfc_trans_deallocate (gfc_code *code)
 
       slen = build_int_cst (gfc_charlen_type_node, ((int) strlen (msg)));
       dlen = gfc_get_expr_charlen (code->expr2);
-      slen = fold_build2 (MIN_EXPR, TREE_TYPE (slen), dlen, slen);
+      slen = fold_build2_loc (input_location, MIN_EXPR, TREE_TYPE (slen), dlen,
+                             slen);
 
       dlen = build_call_expr_loc (input_location,
                              built_in_decls[BUILT_IN_MEMCPY], 3,
                gfc_build_addr_expr (pvoid_type_node, se.expr), errmsg, slen);
 
-      tmp = fold_build2 (NE_EXPR, boolean_type_node, astat,
-                        build_int_cst (TREE_TYPE (astat), 0));
+      tmp = fold_build2_loc (input_location, NE_EXPR, boolean_type_node, astat,
+                            build_int_cst (TREE_TYPE (astat), 0));
 
       tmp = build3_v (COND_EXPR, tmp, dlen, build_empty_stmt (input_location));
 
@@ -4476,3 +4886,4 @@ gfc_trans_deallocate (gfc_code *code)
   return gfc_finish_block (&block);
 }
 
+#include "gt-fortran-trans-stmt.h"