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gh-127604: Replace dprintf() with _Py_write_noraise() #132854

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Merged
merged 2 commits into from
Apr 23, 2025
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gh-127604: Replace dprintf() with _Py_write_noraise() #132854

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gh-127604: Replace dprintf() with _Py_write_noraise()
vstinner Apr 23, 2025
83f4e99
Add dump_char() function
vstinner Apr 23, 2025
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58 changes: 44 additions & 14 deletions Python/traceback.c
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Original file line number Diff line number Diff line change
Expand Up @@ -842,11 +842,11 @@ _Py_DumpDecimal(int fd, size_t value)

/* Format an integer as hexadecimal with width digits into fd file descriptor.
The function is signal safe. */
void
_Py_DumpHexadecimal(int fd, uintptr_t value, Py_ssize_t width)
static void
dump_hexadecimal(int fd, uintptr_t value, Py_ssize_t width, int strip_zeros)
{
char buffer[sizeof(uintptr_t) * 2 + 1], *ptr, *end;
const Py_ssize_t size = Py_ARRAY_LENGTH(buffer) - 1;
Py_ssize_t size = Py_ARRAY_LENGTH(buffer) - 1;

if (width > size)
width = size;
Expand All @@ -862,7 +862,28 @@ _Py_DumpHexadecimal(int fd, uintptr_t value, Py_ssize_t width)
value >>= 4;
} while ((end - ptr) < width || value);

(void)_Py_write_noraise(fd, ptr, end - ptr);
size = end - ptr;
if (strip_zeros) {
while (*ptr == '0' && size >= 2) {
ptr++;
size--;
}
}

(void)_Py_write_noraise(fd, ptr, size);
}

void
_Py_DumpHexadecimal(int fd, uintptr_t value, Py_ssize_t width)
{
dump_hexadecimal(fd, value, width, 0);
}

static void
dump_pointer(int fd, void *ptr)
{
PUTS(fd, "0x");
dump_hexadecimal(fd, (uintptr_t)ptr, sizeof(void*), 1);
}

void
Expand Down Expand Up @@ -1227,7 +1248,9 @@ _Py_backtrace_symbols_fd(int fd, void *const *array, Py_ssize_t size)
|| info[i].dli_fname == NULL
|| info[i].dli_fname[0] == '\0'
) {
dprintf(fd, " Binary file '<unknown>' [%p]\n", array[i]);
PUTS(fd, " Binary file '<unknown>' [");
dump_pointer(fd, array[i]);
PUTS(fd, "]\n");
continue;
}

Expand All @@ -1237,11 +1260,12 @@ _Py_backtrace_symbols_fd(int fd, void *const *array, Py_ssize_t size)
info[i].dli_saddr = info[i].dli_fbase;
}

if (info[i].dli_sname == NULL
&& info[i].dli_saddr == 0) {
dprintf(fd, " Binary file \"%s\" [%p]\n",
info[i].dli_fname,
array[i]);
if (info[i].dli_sname == NULL && info[i].dli_saddr == 0) {
PUTS(fd, " Binary file \"");
PUTS(fd, info[i].dli_fname);
PUTS(fd, "\" [");
dump_pointer(fd, array[i]);
PUTS(fd, "]\n");
}
else {
char sign;
Expand All @@ -1255,10 +1279,16 @@ _Py_backtrace_symbols_fd(int fd, void *const *array, Py_ssize_t size)
offset = info[i].dli_saddr - array[i];
}
const char *symbol_name = info[i].dli_sname != NULL ? info[i].dli_sname : "";
dprintf(fd, " Binary file \"%s\", at %s%c%#tx [%p]\n",
info[i].dli_fname,
symbol_name,
sign, offset, array[i]);
PUTS(fd, " Binary file \"");
PUTS(fd, info[i].dli_fname);
PUTS(fd, "\", at ");
PUTS(fd, symbol_name);
(void)_Py_write_noraise(fd, &sign, 1);
PUTS(fd, "0x");
dump_hexadecimal(fd, offset, sizeof(offset), 1);
PUTS(fd, " [");
dump_pointer(fd, array[i]);
PUTS(fd, "]\n");
}
}
}
Expand Down
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