gdb: add target_ops::supports_displaced_step

[deliverable/binutils-gdb.git] / gas / as.c

diff --git a/gas/as.c b/gas/as.c
index cc84725a421fcdc60b7a6eac157d42feceb3da60..4c5881abd88c8fd493b8448fa7859810f1d8c197 100644 (file)
--- a/gas/as.c
+++ b/gas/as.c
@@ -1,5 +1,5 @@
 /* as.c - GAS main program.
-   Copyright (C) 1987-2019 Free Software Foundation, Inc.
+   Copyright (C) 1987-2020 Free Software Foundation, Inc.
 
    This file is part of GAS, the GNU Assembler.
 
@@ -95,10 +95,15 @@ int debug_memory = 0;
 /* Enable verbose mode.  */
 int verbose = 0;
 
-/* Which version of DWARF CIE to produce.  The default could be overridden
-   by a target during its initialisation, or by the --gdwarf-cie-version
-   command line flag.  */
-int flag_dwarf_cie_version = 1;
+/* Which version of DWARF CIE to produce.  This default value of -1
+   indicates that this value has not been set yet, a default value is
+   provided in dwarf2_init.  A different value can also be supplied by the
+   command line flag --gdwarf-cie-version, or by a target in
+   MD_AFTER_PARSE_ARGS.  */
+int flag_dwarf_cie_version = -1;
+
+/* The maximum level of DWARF DEBUG information we should manufacture.  */
+unsigned int dwarf_level = 0;
 
 #if defined OBJ_ELF || defined OBJ_MAYBE_ELF
 int flag_use_elf_stt_common = DEFAULT_GENERATE_ELF_STT_COMMON;
@@ -336,7 +341,7 @@ Options:\n\
   fprintf (stream, _("\
   --gstabs+               generate STABS debug info with GNU extensions\n"));
   fprintf (stream, _("\
-  --gdwarf-2              generate DWARF2 debugging information\n"));
+  --gdwarf-<N>            generate DWARF<N> debugging information. 2 <= <N> <= 5\n"));
   fprintf (stream, _("\
   --gdwarf-sections       generate per-function section names for DWARF line information\n"));
   fprintf (stream, _("\
@@ -482,7 +487,10 @@ parse_args (int * pargc, char *** pargv)
       OPTION_DEPFILE,
       OPTION_GSTABS,
       OPTION_GSTABS_PLUS,
-      OPTION_GDWARF2,
+      OPTION_GDWARF_2,
+      OPTION_GDWARF_3,
+      OPTION_GDWARF_4,
+      OPTION_GDWARF_5,
       OPTION_GDWARF_SECTIONS,
       OPTION_GDWARF_CIE_VERSION,
       OPTION_STRIP_LOCAL_ABSOLUTE,
@@ -535,10 +543,13 @@ parse_args (int * pargc, char *** pargv)
     ,{"generate-missing-build-notes", required_argument, NULL, OPTION_ELF_BUILD_NOTES}
 #endif
     ,{"fatal-warnings", no_argument, NULL, OPTION_WARN_FATAL}
-    ,{"gdwarf-2", no_argument, NULL, OPTION_GDWARF2}
-    /* GCC uses --gdwarf-2 but GAS uses to use --gdwarf2,
+    ,{"gdwarf-2", no_argument, NULL, OPTION_GDWARF_2}
+    ,{"gdwarf-3", no_argument, NULL, OPTION_GDWARF_3}
+    ,{"gdwarf-4", no_argument, NULL, OPTION_GDWARF_4}
+    ,{"gdwarf-5", no_argument, NULL, OPTION_GDWARF_5}
+    /* GCC uses --gdwarf-2 but GAS used to to use --gdwarf2,
        so we keep it here for backwards compatibility.  */
-    ,{"gdwarf2", no_argument, NULL, OPTION_GDWARF2}
+    ,{"gdwarf2", no_argument, NULL, OPTION_GDWARF_2}
     ,{"gdwarf-sections", no_argument, NULL, OPTION_GDWARF_SECTIONS}
     ,{"gdwarf-cie-version", required_argument, NULL, OPTION_GDWARF_CIE_VERSION}
     ,{"gen-debug", no_argument, NULL, 'g'}
@@ -682,7 +693,7 @@ parse_args (int * pargc, char *** pargv)
        case OPTION_VERSION:
          /* This output is intended to follow the GNU standards document.  */
          printf (_("GNU assembler %s\n"), BFD_VERSION_STRING);
-         printf (_("Copyright (C) 2019 Free Software Foundation, Inc.\n"));
+         printf (_("Copyright (C) 2020 Free Software Foundation, Inc.\n"));
          printf (_("\
 This program is free software; you may redistribute it under the terms of\n\
 the GNU General Public License version 3 or later.\n\
@@ -815,7 +826,10 @@ This program has absolutely no warranty.\n"));
          if (md_debug_format_selector)
            debug_type = md_debug_format_selector (& use_gnu_debug_info_extensions);
          else if (IS_ELF)
-           debug_type = DEBUG_DWARF2;
+           {
+             debug_type = DEBUG_DWARF2;
+             dwarf_level = 2;
+           }
          else
            debug_type = DEBUG_STABS;
          break;
@@ -827,8 +841,24 @@ This program has absolutely no warranty.\n"));
          debug_type = DEBUG_STABS;
          break;
 
-       case OPTION_GDWARF2:
+       case OPTION_GDWARF_2:
+         debug_type = DEBUG_DWARF2;
+         dwarf_level = 2;
+         break;
+
+       case OPTION_GDWARF_3:
+         debug_type = DEBUG_DWARF2;
+         dwarf_level = 3;
+         break;
+
+       case OPTION_GDWARF_4:
          debug_type = DEBUG_DWARF2;
+         dwarf_level = 4;
+         break;
+
+       case OPTION_GDWARF_5:
+         debug_type = DEBUG_DWARF2;
+         dwarf_level = 5;
          break;
 
        case OPTION_GDWARF_SECTIONS:
@@ -843,6 +873,21 @@ This program has absolutely no warranty.\n"));
               || flag_dwarf_cie_version == 2
               || flag_dwarf_cie_version > 4)
             as_fatal (_("Invalid --gdwarf-cie-version `%s'"), optarg);
+         switch (flag_dwarf_cie_version)
+           {
+           case 1:
+             if (dwarf_level < 2)
+               dwarf_level = 2;
+             break;
+           case 3:
+             if (dwarf_level < 3)
+               dwarf_level = 3;
+             break;
+           default:
+             if (dwarf_level < 4)
+               dwarf_level = 4;
+             break;
+           }
          break;
 
        case 'J':
@@ -1288,7 +1333,13 @@ main (int argc, char ** argv)
              /* Different files may have the same inode number if they
                 reside on different devices, so check the st_dev field as
                 well.  */
-             && sib.st_dev == sob.st_dev)
+             && sib.st_dev == sob.st_dev
+             /* PR 25572: Only check regular files.  Devices, sockets and so
+                on might actually work as both input and output.  Plus there
+                is a use case for using /dev/null as both input and output
+                when checking for command line option support in a script:
+                  as --foo /dev/null -o /dev/null; if $? then ...  */
+             && S_ISREG (sib.st_mode))
            {
              const char *saved_out_file_name = out_file_name;