cpython/Parser/pgenmain.c

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/* Parser generator main program */
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/* This expects a filename containing the grammar as argv[1] (UNIX)
or asks the console for such a file name (THINK C).
It writes its output on two files in the current directory:
- "graminit.c" gets the grammar as a bunch of initialized data
- "graminit.h" gets the grammar's non-terminals as #defines.
Error messages and status info during the generation process are
written to stdout, or sometimes to stderr. */
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/* XXX TO DO:
- check for duplicate definitions of names (instead of fatal err)
*/
#define PGEN
#include "Python.h"
#include "pycore_mem.h"
#include "pycore_state.h"
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#include "pgenheaders.h"
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#include "grammar.h"
#include "node.h"
#include "parsetok.h"
#include "pgen.h"
int Py_DebugFlag = 0;
int Py_VerboseFlag = 0;
int Py_IgnoreEnvironmentFlag = 0;
bpo-32030: Split Py_Main() into subfunctions (#4399) * Don't use "Python runtime" anymore to parse command line options or to get environment variables: pymain_init() is now a strict separation. * Use an error message rather than "crashing" directly with Py_FatalError(). Limit the number of calls to Py_FatalError(). It prepares the code to handle errors more nicely later. * Warnings options (-W, PYTHONWARNINGS) and "XOptions" (-X) are now only added to the sys module once Python core is properly initialized. * _PyMain is now the well identified owner of some important strings like: warnings options, XOptions, and the "program name". The program name string is now properly freed at exit. pymain_free() is now responsible to free the "command" string. * Rename most methods in Modules/main.c to use a "pymain_" prefix to avoid conflits and ease debug. * Replace _Py_CommandLineDetails_INIT with memset(0) * Reorder a lot of code to fix the initialization ordering. For example, initializing standard streams now comes before parsing PYTHONWARNINGS. * Py_Main() now handles errors when adding warnings options and XOptions. * Add _PyMem_GetDefaultRawAllocator() private function. * Cleanup _PyMem_Initialize(): remove useless global constants: move them into _PyMem_Initialize(). * Call _PyRuntime_Initialize() as soon as possible: _PyRuntime_Initialize() now returns an error message on failure. * Add _PyInitError structure and following macros: * _Py_INIT_OK() * _Py_INIT_ERR(msg) * _Py_INIT_USER_ERR(msg): "user" error, don't abort() in that case * _Py_INIT_FAILED(err)
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_PyRuntimeState _PyRuntime = _PyRuntimeState_INIT;
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/* Forward */
grammar *getgrammar(const char *filename);
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void
Py_Exit(int sts)
{
exit(sts);
}
/* Needed by obmalloc.c */
int PyGILState_Check(void)
{ return 1; }
void _PyMem_DumpTraceback(int fd, const void *ptr)
{}
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int
main(int argc, char **argv)
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{
grammar *g;
FILE *fp;
char *filename, *graminit_h, *graminit_c;
if (argc != 4) {
fprintf(stderr,
"usage: %s grammar graminit.h graminit.c\n", argv[0]);
Py_Exit(2);
}
filename = argv[1];
graminit_h = argv[2];
graminit_c = argv[3];
g = getgrammar(filename);
fp = fopen(graminit_c, "w");
if (fp == NULL) {
perror(graminit_c);
Py_Exit(1);
}
if (Py_DebugFlag)
printf("Writing %s ...\n", graminit_c);
printgrammar(g, fp);
fclose(fp);
fp = fopen(graminit_h, "w");
if (fp == NULL) {
perror(graminit_h);
Py_Exit(1);
}
if (Py_DebugFlag)
printf("Writing %s ...\n", graminit_h);
printnonterminals(g, fp);
fclose(fp);
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freegrammar(g);
Py_Exit(0);
return 0; /* Make gcc -Wall happy */
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}
grammar *
getgrammar(const char *filename)
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{
FILE *fp;
node *n;
grammar *g0, *g;
perrdetail err;
fp = fopen(filename, "r");
if (fp == NULL) {
perror(filename);
Py_Exit(1);
}
g0 = meta_grammar();
n = PyParser_ParseFile(fp, filename, g0, g0->g_start,
(char *)NULL, (char *)NULL, &err);
fclose(fp);
if (n == NULL) {
fprintf(stderr, "Parsing error %d, line %d.\n",
err.error, err.lineno);
if (err.text != NULL) {
size_t len;
int i;
fprintf(stderr, "%s", err.text);
len = strlen(err.text);
if (len == 0 || err.text[len-1] != '\n')
fprintf(stderr, "\n");
for (i = 0; i < err.offset; i++) {
if (err.text[i] == '\t')
putc('\t', stderr);
else
putc(' ', stderr);
}
fprintf(stderr, "^\n");
PyObject_FREE(err.text);
}
Py_Exit(1);
}
g = pgen(n);
PyNode_Free(n);
if (g == NULL) {
printf("Bad grammar.\n");
Py_Exit(1);
}
return g;
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}
/* Can't happen in pgen */
PyObject*
PyErr_Occurred()
{
return 0;
}
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void
Py_FatalError(const char *msg)
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{
fprintf(stderr, "pgen: FATAL ERROR: %s\n", msg);
Py_Exit(1);
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}
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/* No-nonsense my_readline() for tokenizer.c */
char *
PyOS_Readline(FILE *sys_stdin, FILE *sys_stdout, const char *prompt)
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{
size_t n = 1000;
char *p = (char *)PyMem_MALLOC(n);
char *q;
if (p == NULL)
return NULL;
fprintf(stderr, "%s", prompt);
q = fgets(p, n, sys_stdin);
if (q == NULL) {
*p = '\0';
return p;
}
n = strlen(p);
if (n > 0 && p[n-1] != '\n')
p[n-1] = '\n';
return (char *)PyMem_REALLOC(p, n+1);
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}
/* No-nonsense fgets */
char *
Py_UniversalNewlineFgets(char *buf, int n, FILE *stream, PyObject *fobj)
{
return fgets(buf, n, stream);
}
#include <stdarg.h>
void
PySys_WriteStderr(const char *format, ...)
{
va_list va;
va_start(va, format);
vfprintf(stderr, format, va);
va_end(va);
}