tools lib traceevent: Add support for __print_hex()

Since the __print_hex() function is used in print fmt now, add
corresponding parser routines. This makes the output of perf script on
the kvm_emulate_insn event not to fail any more.

 before:
      kvm_emulate_insn:     [FAILED TO PARSE] rip=3238197797 ...

 after:
      kvm_emulate_insn:     0:c102fa25:89 10 (prot32)

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Steven Rostedt <rostedt@goodmis.org>
Link: http://lkml.kernel.org/r/1340757701-10711-4-git-send-email-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

2 files changed, 81 insertions, 1 deletions

diff --git a/tools/lib/traceevent/event-parse.c b/tools/lib/traceevent/event-parse.c
index 63d02be5480f..b1abd39923d6 100644
--- a/tools/lib/traceevent/event-parse.c
+++ b/tools/lib/traceevent/event-parse.c
@@ -697,6 +697,10 @@ static void free_arg(struct print_arg *arg)
                 free_arg(arg->symbol.field);
                 free_flag_sym(arg->symbol.symbols);
                 break;
+        case PRINT_HEX:
+                free_arg(arg->hex.field);
+                free_arg(arg->hex.size);
+                break;
         case PRINT_TYPE:
                 free(arg->typecast.type);
                 free_arg(arg->typecast.item);
@@ -2260,6 +2264,45 @@ process_symbols(struct event_format *event, struct print_arg *arg, char **tok)
 }
 
 static enum event_type
+process_hex(struct event_format *event, struct print_arg *arg, char **tok)
+{
+        struct print_arg *field;
+        enum event_type type;
+        char *token;
+
+        memset(arg, 0, sizeof(*arg));
+        arg->type = PRINT_HEX;
+
+        field = alloc_arg();
+        type = process_arg(event, field, &token);
+
+        if (test_type_token(type, token, EVENT_DELIM, ","))
+                goto out_free;
+
+        arg->hex.field = field;
+
+        free_token(token);
+
+        field = alloc_arg();
+        type = process_arg(event, field, &token);
+
+        if (test_type_token(type, token, EVENT_DELIM, ")"))
+                goto out_free;
+
+        arg->hex.size = field;
+
+        free_token(token);
+        type = read_token_item(tok);
+        return type;
+
+ out_free:
+        free_arg(field);
+        free_token(token);
+        *tok = NULL;
+        return EVENT_ERROR;
+}
+
+static enum event_type
 process_dynamic_array(struct event_format *event, struct print_arg *arg, char **tok)
 {
         struct format_field *field;
@@ -2488,6 +2531,10 @@ process_function(struct event_format *event, struct print_arg *arg,
                 is_symbolic_field = 1;
                 return process_symbols(event, arg, tok);
         }
+        if (strcmp(token, "__print_hex") == 0) {
+                free_token(token);
+                return process_hex(event, arg, tok);
+        }
         if (strcmp(token, "__get_str") == 0) {
                 free_token(token);
                 return process_str(event, arg, tok);
@@ -2995,6 +3042,7 @@ eval_num_arg(void *data, int size, struct event_format *event, struct print_arg
                 break;
         case PRINT_FLAGS:
         case PRINT_SYMBOL:
+        case PRINT_HEX:
                 break;
         case PRINT_TYPE:
                 val = eval_num_arg(data, size, event, arg->typecast.item);
@@ -3218,8 +3266,9 @@ static void print_str_arg(struct trace_seq *s, void *data, int size,
         unsigned long long val, fval;
         unsigned long addr;
         char *str;
+        unsigned char *hex;
         int print;
-        int len;
+        int i, len;
 
         switch (arg->type) {
         case PRINT_NULL:
@@ -3284,6 +3333,23 @@ static void print_str_arg(struct trace_seq *s, void *data, int size,
                         }
                 }
                 break;
+        case PRINT_HEX:
+                field = arg->hex.field->field.field;
+                if (!field) {
+                        str = arg->hex.field->field.name;
+                        field = pevent_find_any_field(event, str);
+                        if (!field)
+                                die("field %s not found", str);
+                        arg->hex.field->field.field = field;
+                }
+                hex = data + field->offset;
+                len = eval_num_arg(data, size, event, arg->hex.size);
+                for (i = 0; i < len; i++) {
+                        if (i)
+                                trace_seq_putc(s, ' ');
+                        trace_seq_printf(s, "%02x", hex[i]);
+                }
+                break;
 
         case PRINT_TYPE:
                 break;
@@ -4294,6 +4360,13 @@ static void print_args(struct print_arg *args)
                 trace_seq_destroy(&s);
                 printf(")");
                 break;
+        case PRINT_HEX:
+                printf("__print_hex(");
+                print_args(args->hex.field);
+                printf(", ");
+                print_args(args->hex.size);
+                printf(")");
+                break;
         case PRINT_STRING:
         case PRINT_BSTRING:
                 printf("__get_str(%s)", args->string.string);
diff --git a/tools/lib/traceevent/event-parse.h b/tools/lib/traceevent/event-parse.h
index ac997bc7b592..5772ad8cb386 100644
--- a/tools/lib/traceevent/event-parse.h
+++ b/tools/lib/traceevent/event-parse.h
@@ -226,6 +226,11 @@ struct print_arg_symbol {
         struct print_flag_sym   *symbols;
 };
 
+struct print_arg_hex {
+        struct print_arg        *field;
+        struct print_arg        *size;
+};
+
 struct print_arg_dynarray {
         struct format_field     *field;
         struct print_arg        *index;
@@ -253,6 +258,7 @@ enum print_arg_type {
         PRINT_FIELD,
         PRINT_FLAGS,
         PRINT_SYMBOL,
+        PRINT_HEX,
         PRINT_TYPE,
         PRINT_STRING,
         PRINT_BSTRING,
@@ -270,6 +276,7 @@ struct print_arg {
                 struct print_arg_typecast       typecast;
                 struct print_arg_flags          flags;
                 struct print_arg_symbol         symbol;
+                struct print_arg_hex            hex;
                 struct print_arg_func           func;
                 struct print_arg_string         string;
                 struct print_arg_op             op;