[PATCH] arc: Construct disassembler options dynamically
Shahab Vahedi
shahab.vahedi@gmail.com
Wed May 12 09:04:14 GMT 2021
From: Shahab Vahedi <shahab@synopsys.com>
The idea of this change is simple: Populate a data structure, namely
"disasm_option_and_arg_t" from "include/dis-asm.h", to encompass the
disassembly options and their possible arguments.
This will make it easier to manage or extend those options by adapting
entries in a data structure, "arc_options". There will be lesser need
to hard-code the options in the code itself. Moreover, ARC GDB will
use this population function, "disassembler_options_arc ()", to enable
the "set disassembler-option" for ARC targets. The gdb change will be
in a separate patch though.
The changes in this patch can be divided into:
1) Introduction of "disassembler_options_arc ()" that will return a
"disasm_option_and_arg_t" structure representing the disassembly
options and their likely arguments.
2) New data type "arc_options_arg_t" and new data "arc_options".
These are the internals for keeping track of options and arguments
entries that can easily be extended.
3) To print the options, the "print_arc_disassembler_options ()" has
been adjusted to use this dynamically built structure instead of having
them hard-coded inside.
To see this in effect, one can look into the output of:
$ ./binutils/objdump --help
...
The following ARC specific disassembler options are...
...
include/ChangeLog:
* dis-asm.h (disassembler_options_arc): New prototype.
opcodes/ChangeLog:
* arc-dis.c (arc_option_arg_t): New enumeration.
(arc_options): New variable.
(disassembler_options_arc): New function.
(print_arc_disassembler_options): Reimplement in terms of
"disassembler_options_arc".
---
include/dis-asm.h | 1 +
opcodes/arc-dis.c | 180 +++++++++++++++++++++++++++++++++++++++-------
2 files changed, 154 insertions(+), 27 deletions(-)
diff --git a/include/dis-asm.h b/include/dis-asm.h
index e8b42b05464..0b91ab47ff3 100644
--- a/include/dis-asm.h
+++ b/include/dis-asm.h
@@ -315,6 +315,7 @@ extern void disassemble_init_powerpc (struct disassemble_info *);
extern void disassemble_init_s390 (struct disassemble_info *);
extern void disassemble_init_wasm32 (struct disassemble_info *);
extern void disassemble_init_nds32 (struct disassemble_info *);
+extern const disasm_options_and_args_t *disassembler_options_arc (void);
extern const disasm_options_and_args_t *disassembler_options_arm (void);
extern const disasm_options_and_args_t *disassembler_options_mips (void);
extern const disasm_options_and_args_t *disassembler_options_powerpc (void);
diff --git a/opcodes/arc-dis.c b/opcodes/arc-dis.c
index 78e8e80eed9..4abb866304d 100644
--- a/opcodes/arc-dis.c
+++ b/opcodes/arc-dis.c
@@ -1412,41 +1412,167 @@ arc_get_disassembler (bfd *abfd)
return print_insn_arc;
}
+/* Indices into option argument vector for options that do require
+ an argument. Use ARC_OPTION_ARG_NONE for options that don't
+ expect an argument. */
+typedef enum
+{
+ ARC_OPTION_ARG_NONE = -1,
+ ARC_OPTION_ARG_ARCH,
+ ARC_OPTION_ARG_SIZE
+} arc_option_arg_t;
+
+/* Valid ARC disassembler options. */
+static struct
+{
+ const char *name;
+ const char *description;
+ arc_option_arg_t arg;
+} arc_options[] =
+{
+ { "cpu=", N_("Enforce the designated architecture while decoding."),
+ ARC_OPTION_ARG_ARCH },
+ { "dsp", N_("Recognize DSP instructions."),
+ ARC_OPTION_ARG_NONE },
+ { "spfp", N_("Recognize FPX SP instructions."),
+ ARC_OPTION_ARG_NONE },
+ { "dpfp", N_("Recognize FPX DP instructions."),
+ ARC_OPTION_ARG_NONE },
+ { "quarkse_em", N_("Recognize FPU QuarkSE-EM instructions."),
+ ARC_OPTION_ARG_NONE },
+ { "fpuda", N_("Recognize double assist FPU instructions."),
+ ARC_OPTION_ARG_NONE },
+ { "fpus", N_("Recognize single precision FPU instructions."),
+ ARC_OPTION_ARG_NONE },
+ { "fpud", N_("Recognize double precision FPU instructions."),
+ ARC_OPTION_ARG_NONE },
+ { "nps400", N_("Recognize NPS400 instructions."),
+ ARC_OPTION_ARG_NONE },
+ { "hex", N_("Use only hexadecimal number to print immediates."),
+ ARC_OPTION_ARG_NONE }
+};
+
+/* Populate the structure for representing ARC's disassembly options.
+ Such a dynamic initialization is desired, because it makes the maintenance
+ easier and also gdb uses this to enable the "disassembler-option". */
+
+const disasm_options_and_args_t *
+disassembler_options_arc (void)
+{
+ static disasm_options_and_args_t *opts_and_args;
+
+ if (opts_and_args == NULL)
+ {
+ disasm_option_arg_t *args;
+ disasm_options_t *opts;
+ size_t i;
+ const size_t nr_of_options = ARRAY_SIZE (arc_options);
+ /* There is a null element at the end of CPU_TYPES, therefore
+ NR_OF_CPUS is actually 1 more and that is desired here too. */
+ const size_t nr_of_cpus = ARRAY_SIZE (cpu_types);
+
+ opts_and_args = XNEW (disasm_options_and_args_t);
+ opts_and_args->args
+ = XNEWVEC (disasm_option_arg_t, ARC_OPTION_ARG_SIZE + 1);
+ opts_and_args->options.name
+ = XNEWVEC (const char *, nr_of_options + 1);
+ opts_and_args->options.description
+ = XNEWVEC (const char *, nr_of_options + 1);
+ opts_and_args->options.arg
+ = XNEWVEC (const disasm_option_arg_t *, nr_of_options + 1);
+
+ /* Populate the arguments for "cpu=" option. */
+ args = opts_and_args->args;
+ args[ARC_OPTION_ARG_ARCH].name = "ARCH";
+ args[ARC_OPTION_ARG_ARCH].values = XNEWVEC (const char *, nr_of_cpus);
+ for (i = 0; i < nr_of_cpus; ++i)
+ args[ARC_OPTION_ARG_ARCH].values[i] = cpu_types[i].name;
+ args[ARC_OPTION_ARG_SIZE].name = NULL;
+ args[ARC_OPTION_ARG_SIZE].values = NULL;
+
+ /* Populate the options. */
+ opts = &opts_and_args->options;
+ for (i = 0; i < nr_of_options; ++i)
+ {
+ opts->name[i] = arc_options[i].name;
+ opts->description[i] = arc_options[i].description;
+ if (arc_options[i].arg != ARC_OPTION_ARG_NONE)
+ opts->arg[i] = &args[arc_options[i].arg];
+ else
+ opts->arg[i] = NULL;
+ }
+ opts->name[nr_of_options] = NULL;
+ opts->description[nr_of_options] = NULL;
+ opts->arg[nr_of_options] = NULL;
+ }
+
+ return opts_and_args;
+}
+
+
void
print_arc_disassembler_options (FILE *stream)
{
- int i;
+ const disasm_options_and_args_t *opts_and_args;
+ const disasm_option_arg_t *args;
+ const disasm_options_t *opts;
+ size_t i, j;
+ size_t max_len = 0;
+
+ opts_and_args = disassembler_options_arc ();
+ opts = &opts_and_args->options;
+ args = opts_and_args->args;
+
+ fprintf (stream, _("\nThe following ARC specific disassembler options are"
+ " supported for use \nwith the -M switch (multiple"
+ " options should be separated by commas):\n"));
+
+ /* Find the maximum length for printing options (and their arg name). */
+ for (i = 0; opts->name[i] != NULL; ++i)
+ {
+ size_t len = strlen (opts->name[i]);
+ len += (opts->arg[i]) ? strlen (opts->arg[i]->name) : 0;
+ max_len = (len > max_len) ? len : max_len;
+ }
- fprintf (stream, _("\n\
-The following ARC specific disassembler options are supported for use \n\
-with -M switch (multiple options should be separated by commas):\n"));
+ /* Print the options, their arg and description, if any. */
+ for (i = 0, ++max_len; opts->name[i] != NULL; ++i)
+ {
+ fprintf (stream, " %s", opts->name[i]);
+ if (opts->arg[i] != NULL)
+ fprintf (stream, "%s", opts->arg[i]->name);
+ if (opts->description[i] != NULL)
+ {
+ size_t len = strlen (opts->name[i]);
+ len += (opts->arg[i]) ? strlen (opts->arg[i]->name) : 0;
+ fprintf (stream,
+ "%*c %s", (int) (max_len - len), ' ', opts->description[i]);
+ }
+ fprintf (stream, _("\n"));
+ }
- /* cpu=... options. */
- for (i = 0; cpu_types[i].name; ++i)
+ /* Print the possible values of an argument. */
+ for (i = 0; args[i].name != NULL; ++i)
{
- /* As of now all value CPU values are less than 16 characters. */
- fprintf (stream, " cpu=%-16s\tEnforce %s ISA.\n",
- cpu_types[i].name, cpu_types[i].isa);
+ size_t len = 3;
+ fprintf (stream, _("\n\
+ For the options above, the following values are supported for \"%s\":\n "),
+ args[i].name);
+ for (j = 0; args[i].values[j] != NULL; ++j)
+ {
+ fprintf (stream, " %s", args[i].values[j]);
+ len += strlen (args[i].values[j]) + 1;
+ /* reset line if printed too long. */
+ if (len >= 78)
+ {
+ fprintf (stream, _("\n "));
+ len = 3;
+ }
+ }
+ fprintf (stream, _("\n"));
}
- fprintf (stream, _("\
- dsp Recognize DSP instructions.\n"));
- fprintf (stream, _("\
- spfp Recognize FPX SP instructions.\n"));
- fprintf (stream, _("\
- dpfp Recognize FPX DP instructions.\n"));
- fprintf (stream, _("\
- quarkse_em Recognize FPU QuarkSE-EM instructions.\n"));
- fprintf (stream, _("\
- fpuda Recognize double assist FPU instructions.\n"));
- fprintf (stream, _("\
- fpus Recognize single precision FPU instructions.\n"));
- fprintf (stream, _("\
- fpud Recognize double precision FPU instructions.\n"));
- fprintf (stream, _("\
- nps400 Recognize NPS400 instructions.\n"));
- fprintf (stream, _("\
- hex Use only hexadecimal number to print immediates.\n"));
+ fprintf (stream, _("\n"));
}
void arc_insn_decode (bfd_vma addr,
--
2.31.1
More information about the Binutils
mailing list