Add DWARF2_LINENO_DEBUGGING_INFO, and use it for nvptx

	gcc/
	* config/nvptx/nvptx.c (nvptx_option_override): Don't override
	debug options.
	* config/nvptx/nvptx.h (DWARF2_LINENO_DEBUGGING_INFO): Define.
	(DWARF2_DEBUGGING_INFO): Don't define.
	* debug.h (dwarf2_lineno_debug_hooks): Declare.
	* toplev.c (process_options): Add a case for it.
	* dwarf2out.c (dwarf2_lineno_debug_hooks): New variable.
	(dwarf2out_init): Skip most initializations if
	DWARF2_LINENO_DEBUGGING_INFO, but set cur_line_info_table in that
	case.
	* defaults.h (PREFERRED_DEBUGGING_TYPE): Also use DWARF2_DEBUG if
	DWARF2_LINENO_DEBUGGING_INFO.
	* opts.c (set_debug_level): Likewise.

Co-Authored-By: Bernd Schmidt <bernds@codesourcery.com>

From-SVN: r226890

1 files changed, 43 insertions, 0 deletions

diff --git a/gcc/dwarf2out.c b/gcc/dwarf2out.c
index 2c7dc71..92903f8 100644
--- a/gcc/dwarf2out.c
+++ b/gcc/dwarf2out.c
@@ -2489,6 +2489,43 @@ const struct gcc_debug_hooks dwarf2_debug_hooks =
   1,                            /* start_end_main_source_file */
   TYPE_SYMTAB_IS_DIE            /* tree_type_symtab_field */
 };
+
+const struct gcc_debug_hooks dwarf2_lineno_debug_hooks =
+{
+  dwarf2out_init,
+  debug_nothing_charstar,
+  debug_nothing_void,
+  debug_nothing_void,
+  debug_nothing_int_charstar,
+  debug_nothing_int_charstar,
+  debug_nothing_int_charstar,
+  debug_nothing_int,
+  debug_nothing_int_int,	         /* begin_block */
+  debug_nothing_int_int,	         /* end_block */
+  debug_true_const_tree,	         /* ignore_block */
+  dwarf2out_source_line,	 /* source_line */
+  debug_nothing_int_charstar,	         /* begin_prologue */
+  debug_nothing_int_charstar,	         /* end_prologue */
+  debug_nothing_int_charstar,	         /* begin_epilogue */
+  debug_nothing_int_charstar,	         /* end_epilogue */
+  debug_nothing_tree,		         /* begin_function */
+  debug_nothing_int,		         /* end_function */
+  debug_nothing_tree,			 /* register_main_translation_unit */
+  debug_nothing_tree,		         /* function_decl */
+  debug_nothing_tree,		         /* early_global_decl */
+  debug_nothing_tree,		         /* late_global_decl */
+  debug_nothing_tree_int,		 /* type_decl */
+  debug_nothing_tree_tree_tree_bool,	 /* imported_module_or_decl */
+  debug_nothing_tree,		         /* deferred_inline_function */
+  debug_nothing_tree,		         /* outlining_inline_function */
+  debug_nothing_rtx_code_label,	         /* label */
+  debug_nothing_int,		         /* handle_pch */
+  debug_nothing_rtx_insn,	         /* var_location */
+  debug_nothing_void,                    /* switch_text_section */
+  debug_nothing_tree_tree,		 /* set_name */
+  0,                                     /* start_end_main_source_file */
+  TYPE_SYMTAB_IS_ADDRESS                 /* tree_type_symtab_field */
+};
 
 /* NOTE: In the comments in this file, many references are made to
    "Debugging Information Entries".  This term is abbreviated as `DIE'
@@ -23183,6 +23220,7 @@ dwarf2out_init (const char *filename ATTRIBUTE_UNUSED)
   /* Allocate the file_table.  */
   file_table = hash_table<dwarf_file_hasher>::create_ggc (50);
 
+#ifndef DWARF2_LINENO_DEBUGGING_INFO
   /* Allocate the decl_die_table.  */
   decl_die_table = hash_table<decl_die_hasher>::create_ggc (10);
 
@@ -23298,11 +23336,16 @@ dwarf2out_init (const char *filename ATTRIBUTE_UNUSED)
 
   switch_to_section (text_section);
   ASM_OUTPUT_LABEL (asm_out_file, text_section_label);
+#endif
 
   /* Make sure the line number table for .text always exists.  */
   text_section_line_info = new_line_info_table ();
   text_section_line_info->end_label = text_end_label;
 
+#ifdef DWARF2_LINENO_DEBUGGING_INFO
+  cur_line_info_table = text_section_line_info;
+#endif
+
   /* If front-ends already registered a main translation unit but we were not
      ready to perform the association, do this now.  */
   if (main_translation_unit != NULL_TREE)