final.c (final_scan_insn): Flip in_cold_section_p when changing between the hot and cold sections.

	* final.c (final_scan_insn): Flip in_cold_section_p when changing
	between the hot and cold sections.  Use current_function_section
	to get the new section.
	* dwarf2out.c (output_line_info): Use in_cold_section_p to
	determine whether we are assembling hot or cold code.
	(secname_for_decl, dwarf2out_var_location): Likewise.
	(dwarf2out_init, dwarf2out_finish): Use switch_to_section.
	* varasm.c (last_text_section): Delete.
	(in_cold_section_p): New variable.
	(hot_function_section): New function.
	(current_function_section): Pass in_cold_section_p as the
	reloc argument to select_section.  Use it to decide between
	unlikely_function_section and hot_function_section.
	(assemble_start_function): Use switch_to_section.  Set
	in_cold_section_p instead of last_text_section.
	(assemble_end_function): Use switch_to_section.
	(switch_to_section): Don't set last_text_section.
	* config/darwin/darwin.c (machopic_select_section): Trust the reloc
	argument to make the right choice between hot and cold sections.

From-SVN: r108572

gcc/ChangeLog

+2005-12-15  Richard Sandiford  <richard@codesourcery.com>
+
+	* final.c (final_scan_insn): Flip in_cold_section_p when changing
+	between the hot and cold sections.  Use current_function_section
+	to get the new section.
+	* dwarf2out.c (output_line_info): Use in_cold_section_p to
+	determine whether we are assembling hot or cold code.
+	(secname_for_decl, dwarf2out_var_location): Likewise.
+	(dwarf2out_init, dwarf2out_finish): Use switch_to_section.
+	* varasm.c (last_text_section): Delete.
+	(in_cold_section_p): New variable.
+	(hot_function_section): New function.
+	(current_function_section): Pass in_cold_section_p as the
+	reloc argument to select_section.  Use it to decide between
+	unlikely_function_section and hot_function_section.
+	(assemble_start_function): Use switch_to_section.  Set
+	in_cold_section_p instead of last_text_section.
+	(assemble_end_function): Use switch_to_section.
+	(switch_to_section): Don't set last_text_section.
+	* config/darwin/darwin.c (machopic_select_section): Trust the reloc
+	argument to make the right choice between hot and cold sections.
+
 2005-12-15  Nathan Sidwell  <nathan@codesourcery.com>
 
 	Second part of MS1->MT renaming

gcc/config/darwin.c

@@ -1093,9 +1093,7 @@ machopic_select_section (tree exp, int reloc,
 
   if (TREE_CODE (exp) == FUNCTION_DECL)
     {
-      if (reloc == 1
-	  || unlikely_text_section_p (last_text_section)
-	  || last_text_section == text_unlikely_coal_section)
+      if (reloc == 1)
 	base_section = (weak_p
 			? text_unlikely_coal_section
 			: unlikely_text_section ());

gcc/dwarf2out.c

@@ -7837,7 +7837,7 @@ output_line_info (void)
   current_file = 1;
   current_line = 1;
 
-  if (cfun && unlikely_text_section_p (last_text_section))
+  if (cfun && in_cold_section_p)
     strcpy (prev_line_label, cfun->cold_section_label);
   else
     strcpy (prev_line_label, text_section_label);
@@ -10182,7 +10182,7 @@ secname_for_decl (tree decl)
       tree sectree = DECL_SECTION_NAME (current_function_decl);
       secname = TREE_STRING_POINTER (sectree);
     }
-  else if (cfun && unlikely_text_section_p (last_text_section))
+  else if (cfun && in_cold_section_p)
     secname = cfun->cold_section_label;
   else
     secname = text_section_label;
@@ -13552,7 +13552,7 @@ dwarf2out_var_location (rtx loc_note)
   newloc->var_loc_note = loc_note;
   newloc->next = NULL;
 
-  if (cfun && unlikely_text_section_p (last_text_section))
+  if (cfun && in_cold_section_p)
     newloc->section_label = cfun->cold_section_label;
   else
     newloc->section_label = text_section_label;
@@ -13841,7 +13841,7 @@ dwarf2out_init (const char *filename ATTRIBUTE_UNUSED)
   ASM_OUTPUT_LABEL (asm_out_file, text_section_label);
   if (flag_reorder_blocks_and_partition)
     {
-      unlikely_text_section ();
+      switch_to_section (unlikely_text_section ());
       ASM_OUTPUT_LABEL (asm_out_file, cold_text_section_label);
     }
 }
@@ -14177,7 +14177,7 @@ dwarf2out_finish (const char *filename)
   targetm.asm_out.internal_label (asm_out_file, TEXT_END_LABEL, 0);
   if (flag_reorder_blocks_and_partition)
     {
-      unlikely_text_section ();
+      switch_to_section (unlikely_text_section ());
       targetm.asm_out.internal_label (asm_out_file, COLD_END_LABEL, 0);
     }
 

gcc/final.c

@@ -1708,22 +1708,9 @@ final_scan_insn (rtx insn, FILE *file, int optimize ATTRIBUTE_UNUSED,
 	  break;
 
 	case NOTE_INSN_SWITCH_TEXT_SECTIONS:
-	  
-	  /* The presence of this note indicates that this basic block
-	     belongs in the "cold" section of the .o file.  If we are
-	     not already writing to the cold section we need to change
-	     to it.  */
-
-	  if (last_text_section == text_section)
-	    {
-	      (*debug_hooks->switch_text_section) ();
-	      switch_to_section (unlikely_text_section ());
-	    }
-	  else
-	    {
-	      (*debug_hooks->switch_text_section) ();
-	      switch_to_section (text_section);
-	    }
+	  in_cold_section_p = !in_cold_section_p;
+	  (*debug_hooks->switch_text_section) ();
+	  switch_to_section (current_function_section ());
 	  break;
 	  
 	case NOTE_INSN_BASIC_BLOCK:

gcc/output.h

@@ -499,7 +499,7 @@ extern GTY(()) section *exception_section;
 extern GTY(()) section *eh_frame_section;
 
 extern GTY(()) section *in_section;
-extern GTY(()) section *last_text_section;
+extern GTY(()) bool in_cold_section_p;
 
 extern section *get_unnamed_section (unsigned int, void (*) (const void *),
 				     const void *);

gcc/varasm.c

@@ -167,8 +167,9 @@ section *eh_frame_section;
    been selected or if we lose track of what the current section is.  */
 section *in_section;
 
-/* The last text section used by asm_out_file.  */
-section *last_text_section;
+/* True if code for the current function is currently being directed
+   at the cold section.  */
+bool in_cold_section_p;
 
 /* A linked list of all the unnamed sections.  */
 static GTY(()) section *unnamed_sections;
@@ -411,6 +412,22 @@ asm_output_aligned_bss (FILE *file, tree decl ATTRIBUTE_UNUSED,
 
 #endif /* BSS_SECTION_ASM_OP */
 
+#ifndef USE_SELECT_SECTION_FOR_FUNCTIONS
+/* Return the hot section for function DECL.  Return text_section for
+   null DECLs.  */
+
+static section *
+hot_function_section (tree decl)
+{
+  if (decl != NULL_TREE
+      && DECL_SECTION_NAME (decl) != NULL_TREE
+      && targetm.have_named_sections)
+    return get_named_section (decl, NULL, 0);
+  else
+    return text_section;
+}
+#endif
+
 /* Return the section for function DECL.
 
    If DECL is NULL_TREE, return the text section.  We can be passed
@@ -427,12 +444,7 @@ function_section (tree decl)
 #ifdef USE_SELECT_SECTION_FOR_FUNCTIONS
   return targetm.asm_out.select_section (decl, reloc, DECL_ALIGN (decl));
 #else
-  if (decl != NULL_TREE
-      && DECL_SECTION_NAME (decl) != NULL_TREE
-      && targetm.have_named_sections)
-    return get_named_section (decl, NULL, 0);
-  else
-    return text_section;
+  return hot_function_section (decl);
 #endif
 }
 
@@ -440,17 +452,13 @@ section *
 current_function_section (void)
 {
 #ifdef USE_SELECT_SECTION_FOR_FUNCTIONS
-  int reloc = 0; 
-
-  if (unlikely_text_section_p (last_text_section))
-    reloc = 1;
- 
-  return targetm.asm_out.select_section (current_function_decl, reloc,
+  return targetm.asm_out.select_section (current_function_decl,
+					 in_cold_section_p,
 					 DECL_ALIGN (current_function_decl));
 #else
-  if (last_text_section)
-    return last_text_section;
-  return function_section (current_function_decl);
+  return (in_cold_section_p
+	  ? unlikely_text_section ()
+	  : hot_function_section (current_function_decl));
 #endif
 }
 
@@ -1083,7 +1091,7 @@ assemble_start_function (tree decl, const char *fnname)
 
   if (flag_reorder_blocks_and_partition)
     {
-      unlikely_text_section ();
+      switch_to_section (unlikely_text_section ());
       assemble_align (FUNCTION_BOUNDARY);
       ASM_OUTPUT_LABEL (asm_out_file, cfun->cold_section_label);
 
@@ -1115,7 +1123,7 @@ assemble_start_function (tree decl, const char *fnname)
 	first_function_block_is_cold = true;
     }
 
-  last_text_section = NULL;
+  in_cold_section_p = first_function_block_is_cold;
 
   /* Switch to the correct text section for the start of the function.  */
 
@@ -1200,7 +1208,7 @@ assemble_end_function (tree decl, const char *fnname)
       section *save_text_section;
 
       save_text_section = in_section;
-      unlikely_text_section ();
+      switch_to_section (unlikely_text_section ());
       ASM_OUTPUT_LABEL (asm_out_file, cfun->cold_section_end_label);
       if (first_function_block_is_cold)
 	switch_to_section (text_section);
@@ -5586,11 +5594,7 @@ switch_to_section (section *new_section)
   if (new_section->common.flags & SECTION_FORGET)
     in_section = NULL;
   else
-    {
-      in_section = new_section;
-      if (new_section->common.flags & SECTION_CODE)
-	last_text_section = in_section;
-    }
+    in_section = new_section;
 
   if (new_section->common.flags & SECTION_NAMED)
     {