gcc version: 11.0.0 20210208 (experimental) (GCC)
Following build error on arm64:
.......
In function ‘printf’,
inlined from ‘regs_dump__printf’ at util/session.c:1141:3,
inlined from ‘regs__printf’ at util/session.c:1169:2:
/usr/include/aarch64-linux-gnu/bits/stdio2.h:107:10: \
error: ‘%-5s’ directive argument is null [-Werror=format-overflow=]
107 | return __printf_chk (__USE_FORTIFY_LEVEL - 1, __fmt, \
__va_arg_pack ());
......
In function ‘fprintf’,
inlined from ‘perf_sample__fprintf_regs.isra’ at \
builtin-script.c:622:14:
/usr/include/aarch64-linux-gnu/bits/stdio2.h:100:10: \
error: ‘%5s’ directive argument is null [-Werror=format-overflow=]
100 | return __fprintf_chk (__stream, __USE_FORTIFY_LEVEL - 1, __fmt,
101 | __va_arg_pack ());
cc1: all warnings being treated as errors
.......
This patch fixes Wformat-overflow warnings. Add ternary operator,
The statement evaluates to "Unknown" if reg_name==NULL is met.
Signed-off-by: Jianlin Lv <[email protected]>
---
v2: Add ternary operator to avoid similar errors in other arch.
v3: Declared reg_name in inner block.
---
tools/perf/builtin-script.c | 4 +++-
tools/perf/util/scripting-engines/trace-event-python.c | 3 ++-
tools/perf/util/session.c | 3 ++-
3 files changed, 7 insertions(+), 3 deletions(-)
diff --git a/tools/perf/builtin-script.c b/tools/perf/builtin-script.c
index 42dad4a0f8cf..0d52dc45b1c7 100644
--- a/tools/perf/builtin-script.c
+++ b/tools/perf/builtin-script.c
@@ -643,7 +643,9 @@ static int perf_sample__fprintf_regs(struct regs_dump *regs, uint64_t mask,
for_each_set_bit(r, (unsigned long *) &mask, sizeof(mask) * 8) {
u64 val = regs->regs[i++];
- printed += fprintf(fp, "%5s:0x%"PRIx64" ", perf_reg_name(r), val);
+ const char *reg_name = perf_reg_name(r);
+
+ printed += fprintf(fp, "%5s:0x%"PRIx64" ", reg_name ?: "unknown", val);
}
return printed;
diff --git a/tools/perf/util/scripting-engines/trace-event-python.c b/tools/perf/util/scripting-engines/trace-event-python.c
index c83c2c6564e0..768bdd4240f4 100644
--- a/tools/perf/util/scripting-engines/trace-event-python.c
+++ b/tools/perf/util/scripting-engines/trace-event-python.c
@@ -699,10 +699,11 @@ static int regs_map(struct regs_dump *regs, uint64_t mask, char *bf, int size)
for_each_set_bit(r, (unsigned long *) &mask, sizeof(mask) * 8) {
u64 val = regs->regs[i++];
+ const char *reg_name = perf_reg_name(r);
printed += scnprintf(bf + printed, size - printed,
"%5s:0x%" PRIx64 " ",
- perf_reg_name(r), val);
+ reg_name ?: "unknown", val);
}
return printed;
diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
index 25adbcce0281..2b40f1c431a3 100644
--- a/tools/perf/util/session.c
+++ b/tools/perf/util/session.c
@@ -1138,9 +1138,10 @@ static void regs_dump__printf(u64 mask, u64 *regs)
for_each_set_bit(rid, (unsigned long *) &mask, sizeof(mask) * 8) {
u64 val = regs[i++];
+ const char *reg_name = perf_reg_name(rid);
printf(".... %-5s 0x%016" PRIx64 "\n",
- perf_reg_name(rid), val);
+ reg_name ?: "unknown", val);
}
}
--
2.25.1
On Sat, Feb 13, 2021 at 01:05:16PM +0800, Jianlin Lv wrote:
> gcc version: 11.0.0 20210208 (experimental) (GCC)
>
> Following build error on arm64:
>
> .......
> In function ‘printf’,
> inlined from ‘regs_dump__printf’ at util/session.c:1141:3,
> inlined from ‘regs__printf’ at util/session.c:1169:2:
> /usr/include/aarch64-linux-gnu/bits/stdio2.h:107:10: \
> error: ‘%-5s’ directive argument is null [-Werror=format-overflow=]
>
> 107 | return __printf_chk (__USE_FORTIFY_LEVEL - 1, __fmt, \
> __va_arg_pack ());
>
> ......
> In function ‘fprintf’,
> inlined from ‘perf_sample__fprintf_regs.isra’ at \
> builtin-script.c:622:14:
> /usr/include/aarch64-linux-gnu/bits/stdio2.h:100:10: \
> error: ‘%5s’ directive argument is null [-Werror=format-overflow=]
> 100 | return __fprintf_chk (__stream, __USE_FORTIFY_LEVEL - 1, __fmt,
> 101 | __va_arg_pack ());
>
> cc1: all warnings being treated as errors
> .......
>
> This patch fixes Wformat-overflow warnings. Add ternary operator,
> The statement evaluates to "Unknown" if reg_name==NULL is met.
>
> Signed-off-by: Jianlin Lv <[email protected]>
Acked-by: Jiri Olsa <[email protected]>
thanks,
jirka
> ---
> v2: Add ternary operator to avoid similar errors in other arch.
> v3: Declared reg_name in inner block.
> ---
> tools/perf/builtin-script.c | 4 +++-
> tools/perf/util/scripting-engines/trace-event-python.c | 3 ++-
> tools/perf/util/session.c | 3 ++-
> 3 files changed, 7 insertions(+), 3 deletions(-)
>
> diff --git a/tools/perf/builtin-script.c b/tools/perf/builtin-script.c
> index 42dad4a0f8cf..0d52dc45b1c7 100644
> --- a/tools/perf/builtin-script.c
> +++ b/tools/perf/builtin-script.c
> @@ -643,7 +643,9 @@ static int perf_sample__fprintf_regs(struct regs_dump *regs, uint64_t mask,
>
> for_each_set_bit(r, (unsigned long *) &mask, sizeof(mask) * 8) {
> u64 val = regs->regs[i++];
> - printed += fprintf(fp, "%5s:0x%"PRIx64" ", perf_reg_name(r), val);
> + const char *reg_name = perf_reg_name(r);
> +
> + printed += fprintf(fp, "%5s:0x%"PRIx64" ", reg_name ?: "unknown", val);
> }
>
> return printed;
> diff --git a/tools/perf/util/scripting-engines/trace-event-python.c b/tools/perf/util/scripting-engines/trace-event-python.c
> index c83c2c6564e0..768bdd4240f4 100644
> --- a/tools/perf/util/scripting-engines/trace-event-python.c
> +++ b/tools/perf/util/scripting-engines/trace-event-python.c
> @@ -699,10 +699,11 @@ static int regs_map(struct regs_dump *regs, uint64_t mask, char *bf, int size)
>
> for_each_set_bit(r, (unsigned long *) &mask, sizeof(mask) * 8) {
> u64 val = regs->regs[i++];
> + const char *reg_name = perf_reg_name(r);
>
> printed += scnprintf(bf + printed, size - printed,
> "%5s:0x%" PRIx64 " ",
> - perf_reg_name(r), val);
> + reg_name ?: "unknown", val);
> }
>
> return printed;
> diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
> index 25adbcce0281..2b40f1c431a3 100644
> --- a/tools/perf/util/session.c
> +++ b/tools/perf/util/session.c
> @@ -1138,9 +1138,10 @@ static void regs_dump__printf(u64 mask, u64 *regs)
>
> for_each_set_bit(rid, (unsigned long *) &mask, sizeof(mask) * 8) {
> u64 val = regs[i++];
> + const char *reg_name = perf_reg_name(rid);
>
> printf(".... %-5s 0x%016" PRIx64 "\n",
> - perf_reg_name(rid), val);
> + reg_name ?: "unknown", val);
> }
> }
>
> --
> 2.25.1
>
>> ---
>> tools/perf/builtin-script.c | 4 +++-
>> tools/perf/util/scripting-engines/trace-event-python.c | 3 ++-
>> tools/perf/util/session.c | 3 ++-
>> 3 files changed, 7 insertions(+), 3 deletions(-)
>>
>> diff --git a/tools/perf/builtin-script.c b/tools/perf/builtin-script.c
>> index 42dad4a0f8cf..0d52dc45b1c7 100644
>> --- a/tools/perf/builtin-script.c
>> +++ b/tools/perf/builtin-script.c
>> @@ -643,7 +643,9 @@ static int perf_sample__fprintf_regs(struct regs_dump *regs, uint64_t mask,
>>
>> for_each_set_bit(r, (unsigned long *) &mask, sizeof(mask) * 8) {
>> u64 val = regs->regs[i++];
>> - printed += fprintf(fp, "%5s:0x%"PRIx64" ", perf_reg_name(r), val);
>> + const char *reg_name = perf_reg_name(r);
>> +
>> + printed += fprintf(fp, "%5s:0x%"PRIx64" ", reg_name ?: "unknown", val);
>> }
>>
>> return printed;
>> diff --git a/tools/perf/util/scripting-engines/trace-event-python.c b/tools/perf/util/scripting-engines/trace-event-python.c
>> index c83c2c6564e0..768bdd4240f4 100644
>> --- a/tools/perf/util/scripting-engines/trace-event-python.c
>> +++ b/tools/perf/util/scripting-engines/trace-event-python.c
>> @@ -699,10 +699,11 @@ static int regs_map(struct regs_dump *regs, uint64_t mask, char *bf, int size)
>>
>> for_each_set_bit(r, (unsigned long *) &mask, sizeof(mask) * 8) {
>> u64 val = regs->regs[i++];
>> + const char *reg_name = perf_reg_name(r);
>>
>> printed += scnprintf(bf + printed, size - printed,
>> "%5s:0x%" PRIx64 " ",
>> - perf_reg_name(r), val);
>> + reg_name ?: "unknown", val);
what I was trying to suggest previously was to add a small helper
function for this, like:
------- >8 --------
diff --git a/tools/perf/util/perf_regs.h b/tools/perf/util/perf_regs.h
index a45499126184..2663daf4122c 100644
--- a/tools/perf/util/perf_regs.h
+++ b/tools/perf/util/perf_regs.h
@@ -28,18 +28,25 @@ uint64_t arch__user_reg_mask(void);
extern const struct sample_reg sample_reg_masks[];
#include <perf_regs.h>
#define DWARF_MINIMAL_REGS ((1ULL << PERF_REG_IP) | (1ULL << PERF_REG_SP))
int perf_reg_value(u64 *valp, struct regs_dump *regs, int id);
+static inline const char *perf_reg_name_str(int id)
+{
+ const char *str = perf_reg_name(id);
+ if (!str)
+ return "unknown";
+ return str;
+}
+
#else
#define PERF_REGS_MASK 0
#define PERF_REGS_MAX 0
#define DWARF_MINIMAL_REGS PERF_REGS_MASK
-static inline const char *perf_reg_name(int id __maybe_unused)
+static inline const char *perf_reg_name_str(int id __maybe_unused)
{
return "unknown";
}
----8<----
So if someone were to make a change to use perf_reg_name() directly
later and do not compile with gcc-11, then they may break the build.
Hence the helper.
No big deal, though.
>> }
>>
>> return printed;
>> diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
>> index 25adbcce0281..2b40f1c431a3 100644
>> --- a/tools/perf/util/session.c
>> +++ b/tools/perf/util/session.c
>> @@ -1138,9 +1138,10 @@ static void regs_dump__printf(u64 mask, u64 *regs)
>>
>> for_each_set_bit(rid, (unsigned long *) &mask, sizeof(mask) * 8) {
>> u64 val = regs[i++];
>> + const char *reg_name = perf_reg_name(rid);
>>
>> printf(".... %-5s 0x%016" PRIx64 "\n",
>> - perf_reg_name(rid), val);
>> + reg_name ?: "unknown", val);
>> }
>> }
>>
>> --
>> 2.25.1
>>
>
> .
>