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Support ".pyc" files: cached compilation results. 

(Similar to Emacs ".elc" files.)
This commit is contained in:
Guido van Rossum 1991-06-04 19:39:42 +00:00
parent 2cfd356f0a
commit c405b7b2fa
1 changed files with 72 additions and 5 deletions
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77
Python/import.c
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@ -33,6 +33,13 @@ OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
#include "errcode.h"
#include "sysmodule.h"
#include "pythonrun.h"
#include "marshal.h"
#include "compile.h"
#include "ceval.h"
#ifdef THINK_C
#define macintosh
#endif
/* Define pathname separator used in file names */
@ -130,11 +137,15 @@ get_module(m, name, m_ret)
char *name;
object **m_ret;
{
object *d;
FILE *fp;
codeobject *co = NULL;
object *v, *d;
FILE *fp, *fpc;
node *n;
int err;
char namebuf[256];
char namebuf[258];
int namelen;
long mtime;
extern long getmtime();
fp = open_module(name, ".py", namebuf);
if (fp == NULL) {
@ -144,7 +155,33 @@ get_module(m, name, m_ret)
err_setstr(RuntimeError, "no module source file");
return NULL;
}
err = parse_file(fp, namebuf, file_input, &n);
/* Get mtime -- always useful */
mtime = getmtime(namebuf);
/* Check ".pyc" file first */
namelen = strlen(namebuf);
namebuf[namelen] = 'c';
namebuf[namelen+1] = '\0';
fpc = fopen(namebuf, "rb");
if (fpc != NULL) {
long pyc_mtime;
(void) rd_long(fpc); /* Reserved for magic word */
pyc_mtime = rd_long(fpc);
if (pyc_mtime != 0 && pyc_mtime != -1 && pyc_mtime == mtime) {
v = rd_object(fpc);
if (v == NULL || err_occurred() || !is_codeobject(v)) {
err_clear();
XDECREF(v);
}
else
co = (codeobject *)v;
}
fclose(fpc);
}
namebuf[namelen] = '\0';
if (co == NULL)
err = parse_file(fp, namebuf, file_input, &n);
else
err = E_DONE;
fclose(fp);
if (err != E_DONE) {
err_input(err);
@ -159,7 +196,37 @@ get_module(m, name, m_ret)
*m_ret = m;
}
d = getmoduledict(m);
return run_node(n, namebuf, d, d);
if (co == NULL) {
co = compile(n, namebuf);
freetree(n);
if (co == NULL)
return NULL;
/* Now write the code object to the ".pyc" file */
namebuf[namelen] = 'c';
namebuf[namelen+1] = '\0';
fpc = fopen(namebuf, "wb");
if (fpc != NULL) {
wr_long(0L, fpc); /* Reserved for magic word */
/* First write a 0 for mtime */
wr_long(0L, fpc);
wr_object((object *)co, fpc);
if (ferror(fpc)) {
/* Don't keep partial file */
fclose(fpc);
(void) unlink(namebuf);
}
else {
/* Now write the true mtime */
fseek(fpc, 4L, 0);
wr_long(mtime, fpc);
fflush(fpc);
fclose(fpc);
}
}
}
v = eval_code(co, d, d, (object *)NULL);
DECREF(co);
return v;
}
static object *