Add minimal line tables at -g1.

    
2013-11-21  Cary Coutant  <ccoutant@google.com>

gcc/
	* dwarf2out.c (want_pubnames): Don't do pubnames for -g1.
	(add_linkage_name): Don't add linkage name for -g1.
	(decls_for_scope): Process subblocks for -g1.
	(dwarf2out_source_line): Output line tables for -g1.
	(dwarf2out_finish): Likewise.
	* tree-ssa-live.c (remove_unused_scope_block_p): Don't prune
	unused scopes for -g1.
	* opts.c (common_handle_option): Handle -g same as -g2.
	* doc/invoke.texi: Update description for -g1.

gcc/testsuite/
	* gcc.dg/debug/dwarf2/mlt1.c: New test.
	* gcc.dg/debug/dwarf2/mlt2.c: New test.

From-SVN: r205235

1 files changed, 23 insertions, 17 deletions

diff --git a/gcc/dwarf2out.c b/gcc/dwarf2out.c
index 23cd726..1c0effd 100644
--- a/gcc/dwarf2out.c
+++ b/gcc/dwarf2out.c
@@ -8849,6 +8849,8 @@ output_comp_unit (dw_die_ref die, int output_if_empty)
 static inline bool
 want_pubnames (void)
 {
+  if (debug_info_level <= DINFO_LEVEL_TERSE)
+    return false;
   if (debug_generate_pub_sections != -1)
     return debug_generate_pub_sections;
   return targetm.want_debug_pub_sections;
@@ -16563,11 +16565,12 @@ add_src_coords_attributes (dw_die_ref die, tree decl)
 static void
 add_linkage_name (dw_die_ref die, tree decl)
 {
-  if ((TREE_CODE (decl) == FUNCTION_DECL || TREE_CODE (decl) == VAR_DECL)
-       && TREE_PUBLIC (decl)
-       && !DECL_ABSTRACT (decl)
-       && !(TREE_CODE (decl) == VAR_DECL && DECL_REGISTER (decl))
-       && die->die_tag != DW_TAG_member)
+  if (debug_info_level > DINFO_LEVEL_TERSE
+      && (TREE_CODE (decl) == FUNCTION_DECL || TREE_CODE (decl) == VAR_DECL)
+      && TREE_PUBLIC (decl)
+      && !DECL_ABSTRACT (decl)
+      && !(TREE_CODE (decl) == VAR_DECL && DECL_REGISTER (decl))
+      && die->die_tag != DW_TAG_member)
     {
       /* Defer until we have an assembler name set.  */
       if (!DECL_ASSEMBLER_NAME_SET_P (decl))
@@ -19963,16 +19966,19 @@ decls_for_scope (tree stmt, dw_die_ref context_die, int depth)
   /* Output the DIEs to represent all of the data objects and typedefs
      declared directly within this block but not within any nested
      sub-blocks.  Also, nested function and tag DIEs have been
-     generated with a parent of NULL; fix that up now.  */
-  for (decl = BLOCK_VARS (stmt); decl != NULL; decl = DECL_CHAIN (decl))
-    process_scope_var (stmt, decl, NULL_TREE, context_die);
-  for (i = 0; i < BLOCK_NUM_NONLOCALIZED_VARS (stmt); i++)
-    process_scope_var (stmt, NULL, BLOCK_NONLOCALIZED_VAR (stmt, i),
-    		       context_die);
+     generated with a parent of NULL; fix that up now.  We don't
+     have to do this if we're at -g1.  */
+  if (debug_info_level > DINFO_LEVEL_TERSE)
+    {
+      for (decl = BLOCK_VARS (stmt); decl != NULL; decl = DECL_CHAIN (decl))
+	process_scope_var (stmt, decl, NULL_TREE, context_die);
+      for (i = 0; i < BLOCK_NUM_NONLOCALIZED_VARS (stmt); i++)
+	process_scope_var (stmt, NULL, BLOCK_NONLOCALIZED_VAR (stmt, i),
+			   context_die);
+    }
 
-  /* If we're at -g1, we're not interested in subblocks.  */
-  if (debug_info_level <= DINFO_LEVEL_TERSE)
-    return;
+  /* Even if we're at -g1, we need to process the subblocks in order to get
+     inlined call information.  */
 
   /* Output the DIEs to represent all sub-blocks (and the items declared
      therein) of this block.  */
@@ -21381,7 +21387,7 @@ dwarf2out_source_line (unsigned int line, const char *filename,
   unsigned int file_num;
   dw_line_info_table *table;
 
-  if (debug_info_level < DINFO_LEVEL_NORMAL || line == 0)
+  if (debug_info_level < DINFO_LEVEL_TERSE || line == 0)
     return;
 
   /* The discriminator column was added in dwarf4.  Simplify the below
@@ -24073,7 +24079,7 @@ dwarf2out_finish (const char *filename)
 	}
     }
 
-  if (debug_info_level >= DINFO_LEVEL_NORMAL)
+  if (debug_info_level >= DINFO_LEVEL_TERSE)
     add_AT_lineptr (main_comp_unit_die, DW_AT_stmt_list,
 		    debug_line_section_label);
 
@@ -24130,7 +24136,7 @@ dwarf2out_finish (const char *filename)
       /* Add a pointer to the line table for the main compilation unit
          so that the debugger can make sense of DW_AT_decl_file
          attributes.  */
-      if (debug_info_level >= DINFO_LEVEL_NORMAL)
+      if (debug_info_level >= DINFO_LEVEL_TERSE)
         add_AT_lineptr (ctnode->root_die, DW_AT_stmt_list,
                         (!dwarf_split_debug_info
                          ? debug_line_section_label