ref: c5b90c26871eee25138cfbdb503a293ba47568f3
dir: /driver/posix/scc.c/
/* See LICENSE file for copyright and license details. */
static char sccsid[] = "@(#) ./driver/posix/scc.c";
#define _POSIX_SOURCE
#define _XOPEN_SOURCE 500
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
#include <errno.h>
#include <limits.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "../../inc/arg.h"
#include "../../inc/cc.h"
enum {
CC1,
TEEIR,
CC2,
TEEQBE,
QBE,
TEEAS,
AS,
LD,
STRIP,
LAST_TOOL,
};
static struct tool {
char cmd[PATH_MAX];
char bin[16];
char *outfile;
struct items args;
unsigned nparams;
int in, out, init;
pid_t pid;
} tools[] = {
[CC1] = { .bin = "cc1", .cmd = PREFIX "/libexec/scc/", },
[TEEIR] = { .bin = "tee", .cmd = "tee", },
[CC2] = { .bin = "cc2", .cmd = PREFIX "/libexec/scc/", },
[TEEQBE] = { .bin = "tee", .cmd = "tee", },
[QBE] = { .bin = "qbe", .cmd = "qbe", },
[TEEAS] = { .bin = "tee", .cmd = "tee", },
[AS] = { .bin = "as", .cmd = "as", },
[LD] = { .bin = "gcc", .cmd = "gcc", }, /* TODO use ld */
[STRIP] = { .bin = "strip", .cmd = "strip", },
};
char *argv0;
static char *arch, *objfile, *outfile;
static char *tmpdir;
static size_t tmpdirln;
static struct items objtmp, objout;
static int Eflag, Sflag, cflag, kflag, sflag;
extern int failure;
static void
terminate(void)
{
unsigned i;
if (!kflag) {
for (i = 0; i < objtmp.n; ++i)
unlink(objtmp.s[i]);
}
}
static void
addarg(int tool, char *arg)
{
struct tool *t = &tools[tool];
if (t->args.n < 1)
t->args.n = 1;
newitem(&t->args, arg);
}
static void
setargv0(int tool, char *arg)
{
struct tool *t = &tools[tool];
if (t->args.n > 0)
t->args.s[0] = arg;
else
newitem(&t->args, arg);
}
static int
inittool(int tool)
{
struct tool *t = &tools[tool];
size_t binln;
int n;
if (t->init)
return tool;
switch (tool) {
case CC1: /* FALLTHROUGH */
case CC2:
binln = strlen(t->bin);
if (!arch)
arch = ARCH;
n = snprintf(t->bin + binln,
sizeof(t->bin) - binln,
"-%s", arch);
if (n < 0 || n >= sizeof(t->bin))
die("scc: target tool bin too long");
binln = strlen(t->bin);
if (strlen(t->cmd) + binln + 1 > sizeof(t->cmd))
die("scc: target tool path too long");
strcat(t->cmd, t->bin);
break;
case LD:
addarg(tool, "-no-pie");
addarg(tool, "-o");
t->outfile = outfile ? outfile : xstrdup("a.out");
addarg(tool, t->outfile);
break;
case AS:
addarg(tool, "-o");
break;
default:
break;
}
setargv0(tool, t->bin);
t->nparams = t->args.n;
t->init = 1;
return tool;
}
static char *
outfname(char *path, char *type)
{
char *new, sep, *p;
size_t newsz, pathln;
int tmpfd, n;
if (path) {
sep = '.';
if (p = strrchr(path, '/'))
path = p + 1;
pathln = strlen(path);
if (p = strrchr(path, '.'))
pathln -= strlen(p);
} else {
sep = '/';
type = "scc-XXXXXX";
path = tmpdir;
pathln = tmpdirln;
}
newsz = pathln + 1 + strlen(type) + 1;
new = xmalloc(newsz);
n = snprintf(new, newsz, "%.*s%c%s", (int)pathln, path, sep, type);
if (n < 0 || n >= newsz)
die("scc: wrong output filename");
if (sep == '/') {
if ((tmpfd = mkstemp(new)) < 0)
die("scc: could not create output file '%s': %s",
new, strerror(errno));
close(tmpfd);
}
return new;
}
static int
settool(int tool, char *infile, int nexttool)
{
struct tool *t = &tools[tool];
unsigned i;
int fds[2];
static int fdin = -1;
switch (tool) {
case TEEIR:
t->outfile = outfname(infile, "ir");
addarg(tool, t->outfile);
break;
case TEEQBE:
t->outfile = outfname(infile, "qbe");
addarg(tool, t->outfile);
break;
case TEEAS:
t->outfile = outfname(infile, "as");
addarg(tool, t->outfile);
break;
case AS:
if (cflag && outfile) {
objfile = outfile;
} else {
objfile = (cflag || kflag) ? infile : NULL;
objfile = outfname(objfile, "o");
}
t->outfile = xstrdup(objfile);
addarg(tool, t->outfile);
break;
case STRIP:
if (cflag || kflag) {
for (i = 0; i < objout.n; ++i)
addarg(tool, xstrdup(objout.s[i]));
}
if (!cflag && tools[LD].outfile)
addarg(tool, tools[LD].outfile);
break;
default:
break;
}
if (fdin > -1) {
t->in = fdin;
fdin = -1;
} else {
t->in = -1;
if (infile)
addarg(tool, xstrdup(infile));
}
if (nexttool < LAST_TOOL) {
if (pipe(fds))
die("scc: pipe: %s", strerror(errno));
t->out = fds[1];
fdin = fds[0];
} else {
t->out = -1;
}
addarg(tool, NULL);
return tool;
}
static void
spawn(int tool)
{
struct tool *t = &tools[tool];
switch (t->pid = fork()) {
case -1:
die("scc: %s: %s", t->bin, strerror(errno));
case 0:
if (t->out > -1)
dup2(t->out, 1);
if (t->in > -1)
dup2(t->in, 0);
execvp(t->cmd, t->args.s);
fprintf(stderr, "scc: execvp %s: %s\n",
t->cmd, strerror(errno));
_exit(1);
default:
if (t->in > -1)
close(t->in);
if (t->out > -1)
close(t->out);
break;
}
}
static int
toolfor(char *file)
{
char *dot = strrchr(file, '.');
if (dot) {
if (!strcmp(dot, ".c"))
return CC1;
if (!strcmp(dot, ".ir"))
return CC2;
if (!strcmp(dot, ".qbe"))
return QBE;
if (!strcmp(dot, ".as"))
return AS;
if (!strcmp(dot, ".o"))
return LD;
}
die("scc: do not recognize filetype of %s", file);
}
static int
validatetools(void)
{
struct tool *t;
unsigned i;
int tool, st, failed = LAST_TOOL;
for (tool = 0; tool < LAST_TOOL; ++tool) {
t = &tools[tool];
if (t->pid) {
if (waitpid(t->pid, &st, 0) < 0 ||
!WIFEXITED(st) || WEXITSTATUS(st) != 0) {
failure = 1;
failed = tool;
}
if (tool >= failed && t->outfile)
unlink(t->outfile);
for (i = t->nparams; i < t->args.n; ++i)
free(t->args.s[i]);
t->args.n = t->nparams;
t->pid = 0;
}
}
if (failed < LAST_TOOL) {
unlink(objfile);
free(objfile);
objfile = NULL;
return 0;
}
return 1;
}
static int
buildfile(char *file, int tool)
{
int nexttool;
for (; tool < LAST_TOOL; tool = nexttool) {
switch (tool) {
case CC1:
if (Eflag)
nexttool = LAST_TOOL;
else
nexttool = kflag ? TEEIR : CC2;
break;
case TEEIR:
nexttool = CC2;
break;
case CC2:
if (!arch || strcmp(arch, "qbe"))
nexttool = (Sflag || kflag) ? TEEAS : AS;
else
nexttool = kflag ? TEEQBE : QBE;
break;
case TEEQBE:
nexttool = QBE;
break;
case QBE:
nexttool = (Sflag || kflag) ? TEEAS : AS;
break;
case TEEAS:
nexttool = Sflag ? LAST_TOOL : AS;
break;
case AS:
nexttool = LAST_TOOL;
break;
default:
nexttool = LAST_TOOL;
continue;
}
spawn(settool(inittool(tool), file, nexttool));
}
return validatetools();
}
static void
build(struct items *chain, int link)
{
int i, tool;
if (link)
inittool(LD);
for (i = 0; i < chain->n; ++i) {
if (!strcmp(chain->s[i], "-l")) {
if (link) {
addarg(LD, xstrdup(chain->s[i++]));
addarg(LD, xstrdup(chain->s[i]));
} else {
++i;
}
continue;
}
tool = toolfor(chain->s[i]);
if (tool == LD) {
if (link)
addarg(LD, xstrdup(chain->s[i]));
continue;
}
if (buildfile(chain->s[i], tool)) {
if (link)
addarg(LD, xstrdup(objfile));
newitem((!link || kflag) ? &objout : &objtmp, objfile);
}
}
}
static void
usage(void)
{
die("usage: scc [-D def[=val]]... [-U def]... [-I dir]... "
"[-L dir]... [-l dir]...\n"
" [-gksw] [-m arch] [-E|-S] [-o outfile] file...\n"
" scc [-D def[=val]]... [-U def]... [-I dir]... "
"[-L dir]... [-l dir]...\n"
" [-gksw] [-m arch] [-E|-S] -c file...\n"
" scc [-D def[=val]]... [-U def]... [-I dir]... "
"[-L dir]... [-l dir]...\n"
" [-gksw] [-m arch] -c -o outfile file");
}
int
main(int argc, char *argv[])
{
struct items linkchain = { .n = 0, };
int link;
atexit(terminate);
arch = getenv("ARCH");
ARGBEGIN {
case 'D':
addarg(CC1, "-D");
addarg(CC1, EARGF(usage()));
break;
case 'E':
Eflag = 1;
addarg(CC1, "-E");
break;
case 'I':
addarg(CC1, "-I");
addarg(CC1, EARGF(usage()));
break;
case 'L':
addarg(LD, "-L");
addarg(LD, EARGF(usage()));
break;
case 'S':
Sflag = 1;
break;
case 'U':
addarg(CC1, "-U");
addarg(CC1, EARGF(usage()));
break;
case 'c':
cflag = 1;
break;
case 'g':
addarg(AS, "-g");
addarg(LD, "-g");
break;
case 'k':
kflag = 1;
break;
case 'l':
newitem(&linkchain, "-l");
newitem(&linkchain, EARGF(usage()));
break;
case 'm':
arch = EARGF(usage());
break;
case 'o':
outfile = xstrdup(EARGF(usage()));
break;
case 's':
sflag = 1;
break;
case 'w':
addarg(CC1, "-w");
break;
case '-':
fprintf(stderr,
"scc: ignored parameter --%s\n", EARGF(usage()));
break;
default:
usage();
} ARGOPERAND {
operand:
newitem(&linkchain, ARGOP());
} ARGEND
for (; *argv; --argc, ++argv)
goto operand;
if (Eflag && (Sflag || kflag) || linkchain.n == 0 ||
linkchain.n > 1 && cflag && outfile)
usage();
if (!(tmpdir = getenv("TMPDIR")) || !tmpdir[0])
tmpdir = ".";
tmpdirln = strlen(tmpdir);
build(&linkchain, (link = !(Eflag || Sflag || cflag)));
if (!(link || cflag))
return failure;
if (link && !failure) {
spawn(settool(LD, NULL, LAST_TOOL));
validatetools();
}
if (sflag) {
spawn(settool(inittool(STRIP), NULL, LAST_TOOL));
validatetools();
}
return failure;
}