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183 lines (172 loc) · 5.03 KB
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#include "Python.h"
#include "source.h"
void
_PyTok_SourceInit(_PyTok_SourceText *source)
{
*source = (_PyTok_SourceText){0};
}
void
_PyTok_SourceClear(_PyTok_SourceText *source)
{
PyMem_Free(source->bytes);
PyMem_Free(source->implicit_lines);
_PyTok_SourceInit(source);
}
void
_PyTok_SourceDiscard(_PyTok_SourceText *source)
{
assert(source->base_offset <= PY_SSIZE_T_MAX - source->len);
source->base_offset += source->len;
source->len = 0;
if (source->bytes != NULL) {
source->bytes[0] = '\0';
}
if (source->implicit_lines != NULL) {
Py_ssize_t used = source->nlines / 8 + (source->nlines % 8 != 0);
memset(source->implicit_lines, 0, Py_MIN(used, source->implicit_cap));
}
source->nlines = 0;
}
static int
reserve_bytes(_PyTok_SourceText *source, Py_ssize_t needed)
{
if (needed <= source->cap) {
return 0;
}
Py_ssize_t cap = source->cap > 0 ? source->cap : BUFSIZ;
while (cap < needed) {
if (cap > PY_SSIZE_T_MAX / 2) {
cap = needed;
break;
}
cap *= 2;
}
char *bytes;
#ifdef Py_DEBUG
/* Moving on growth makes stale interior pointers fail in debug builds. */
bytes = PyMem_Malloc(cap);
if (bytes != NULL && source->len > 0) {
memcpy(bytes, source->bytes, source->len);
}
#else
bytes = PyMem_Realloc(source->bytes, cap);
#endif
if (bytes == NULL) {
PyErr_NoMemory();
return -1;
}
#ifdef Py_DEBUG
if (source->bytes != NULL) {
memset(source->bytes, 0xDD, source->cap);
PyMem_Free(source->bytes);
}
#endif
source->bytes = bytes;
source->cap = cap;
return 0;
}
static int
reserve_implicit_lines(_PyTok_SourceText *source, int nlines)
{
Py_ssize_t needed = nlines / 8 + (nlines % 8 != 0);
if (needed <= source->implicit_cap) {
return 0;
}
Py_ssize_t cap = source->implicit_cap > 0 ? source->implicit_cap : 16;
while (cap < needed) {
if (cap > PY_SSIZE_T_MAX / 2) {
cap = needed;
break;
}
cap *= 2;
}
unsigned char *lines = PyMem_Realloc(source->implicit_lines, cap);
if (lines == NULL) {
PyErr_NoMemory();
return -1;
}
memset(lines + source->implicit_cap, 0, cap - source->implicit_cap);
source->implicit_lines = lines;
source->implicit_cap = cap;
return 0;
}
static int
validate_line(const _PyTok_SourceText *source, const char *bytes,
Py_ssize_t len, int implicit_newline)
{
if (len <= 0 || bytes == NULL ||
(source->nlines > 0 &&
(source->len == 0 || source->bytes[source->len - 1] != '\n'))) {
PyErr_SetString(PyExc_SystemError, "invalid tokenizer source line");
return -1;
}
const char *newline = memchr(bytes, '\n', len);
if ((newline != NULL && newline != bytes + len - 1) ||
(implicit_newline && newline == NULL)) {
PyErr_SetString(PyExc_SystemError, "invalid tokenizer source line");
return -1;
}
if (source->nlines == INT_MAX ||
(source->nlines == INT_MAX - 1 && newline != NULL)) {
PyErr_SetString(PyExc_OverflowError, "too many tokenizer source lines");
return -1;
}
return 0;
}
_PyTok_Off
_PyTok_SourceAppendLine(_PyTok_SourceText *source, const char *bytes,
Py_ssize_t len, int implicit_newline)
{
if (validate_line(source, bytes, len, implicit_newline) < 0) {
return -1;
}
if (source->len > PY_SSIZE_T_MAX - len - 1 ||
source->base_offset > PY_SSIZE_T_MAX - source->len - len) {
PyErr_NoMemory();
return -1;
}
int nlines = source->nlines + 1;
if ((implicit_newline && reserve_implicit_lines(source, nlines) < 0) ||
reserve_bytes(source, source->len + len + 1) < 0) {
return -1;
}
_PyTok_Off start = source->len;
memcpy(source->bytes + start, bytes, len);
source->len += len;
source->bytes[source->len] = '\0';
if (implicit_newline) {
source->implicit_lines[(nlines - 1) / 8] |=
(unsigned char)(1U << ((nlines - 1) & 7));
}
source->nlines = nlines;
return source->base_offset + start;
}
const char *
_PyTok_SourceLineView(const _PyTok_SourceText *source, Py_ssize_t lineno,
Py_ssize_t *len)
{
assert(len != NULL);
const char *line = _PyTok_SourceData(source);
const char *end = line + source->len;
while (lineno > 1) {
const char *newline = memchr(line, '\n', end - line);
if (newline == NULL) {
break;
}
line = newline + 1;
lineno--;
}
const char *newline = memchr(line, '\n', end - line);
*len = (newline != NULL ? newline : end) - line;
return line;
}
int
_PyTok_SourceLineIsImplicit(const _PyTok_SourceText *source, int lineno)
{
if (lineno < 1 || lineno > source->nlines ||
(lineno - 1) / 8 >= source->implicit_cap) {
return 0;
}
return (source->implicit_lines[(lineno - 1) / 8] >>
((lineno - 1) & 7)) & 1;
}