ref: f812d73e86aa308c373e06a170a1b3ba89ad5cb6
dir: /src/cmd/cc/posix/cc.c/
#define _POSIX_SOURCE 200809L
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "config.h"
#include <scc/arg.h>
#include <scc/scc.h>
#include <scc/syscrts.h>
#include <scc/sysincludes.h>
#include <scc/syslibs.h>
#include <scc/ldflags.h>
enum {
CC1,
TEEIR,
CC2,
TEEQBE,
QBE,
TEEAS,
AS,
LD,
STRIP,
LAST_TOOL,
};
static struct tool {
char cmd[PATH_MAX];
char bin[32];
char *outfile;
struct items args;
unsigned nparams;
int in, out, init;
pid_t pid;
} tools[] = {
[CC1] = { .cmd = "cc1" },
[TEEIR] = { .bin = "tee", .cmd = "tee", },
[CC2] = { .cmd = "cc2" },
[TEEQBE] = { .bin = "tee", .cmd = "tee", },
[QBE] = { .bin = "qbe", .cmd = "qbe", },
[TEEAS] = { .bin = "tee", .cmd = "tee", },
[AS] = { .bin = "as", .cmd = "as", },
[LD] = { .bin = "ld", .cmd = "ld", },
[STRIP] = { .bin = "strip", .cmd = "strip", },
};
char *argv0;
static char *arch, *sys, *abi, *format;
static char *prefix, *objfile, *outfile;
static char *tmpdir;
static size_t tmpdirln;
static struct items objtmp, objout;
static int Mflag, Eflag, Sflag, Wflag,
cflag, dflag, kflag, sflag, Qflag = 1; /* TODO: Remove Qflag */
static int devnullfd = -1;
extern int failure;
static void
terminate(void)
{
unsigned i;
if (!kflag) {
for (i = 0; i < objtmp.n; ++i)
unlink(objtmp.s[i]);
}
}
static char *
path(char *s)
{
char *arg, buff[FILENAME_MAX];
size_t len, cnt;
for (cnt = 0 ; *s && cnt < FILENAME_MAX; ++s) {
if (*s != '%') {
buff[cnt++] = *s;
continue;
}
switch (*++s) {
case 'a':
arg = arch;
break;
case 's':
arg = sys;
break;
case 'p':
arg = prefix;
break;
case 'b':
arg = abi;
break;
default:
buff[cnt++] = *s;
continue;
}
len = strlen(arg);
if (len + cnt >= FILENAME_MAX)
die("cc: pathname too long");
memcpy(buff+cnt, arg, len);
cnt += len;
}
if (cnt < FILENAME_MAX) {
buff[cnt] = '\0';
return xstrdup(buff);
}
}
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 char *
cc12fmt(int tool)
{
if (tool == CC1)
return "%s";
if (Qflag && !strcmp(arch, "amd64") && !strcmp(abi, "sysv"))
return "%s-qbe_%s-%s";
return "%s-%s-%s";
}
static int
inittool(int tool)
{
struct tool *t = &tools[tool];
char *crt, *fmt;
int n;
if (t->init)
return tool;
switch (tool) {
case CC1:
if (Wflag)
addarg(tool, "-w");
for (n = 0; sysincludes[n]; ++n) {
addarg(tool, "-I");
addarg(tool, path(sysincludes[n]));
}
case CC2:
fmt = cc12fmt(tool);
n = snprintf(t->bin, sizeof(t->bin), fmt, t->cmd, arch, abi);
if (n < 0 || n >= sizeof(t->bin))
die("cc: target tool name is too long");
n = snprintf(t->cmd, sizeof(t->cmd),
"%s/libexec/scc/%s", prefix, t->bin);
if (n < 0 || n >= sizeof(t->cmd))
die("cc: target tool path is too long");
break;
case LD:
for (n = 0; ldflags[n]; ++n)
addarg(tool, ldflags[n]);
addarg(tool, "-o");
t->outfile = outfile ? outfile : xstrdup("a.out");
addarg(tool, t->outfile);
for (n = 0; syslibs[n]; ++n) {
addarg(tool, "-L");
addarg(tool, path(syslibs[n]));
}
for (n = 0; syscrts[n]; ++n)
addarg(tool, path(syscrts[n]));
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("cc: wrong output filename");
if (sep == '/') {
if ((tmpfd = mkstemp(new)) < 0)
die("cc: 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, "s");
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("cc: 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)
{
char **ap;
struct tool *t = &tools[tool];
switch (t->pid = fork()) {
case -1:
die("cc: %s: %s", t->bin, strerror(errno));
case 0:
if (t->out > -1)
dup2(t->out, 1);
if (t->in > -1)
dup2(t->in, 0);
if (!dflag && tool != CC1 && tool != LD)
dup2(devnullfd, 2);
if (dflag) {
for (ap = t->args.s; *ap; ap++)
fprintf(stderr, " %s", *ap);
putc('\n', stderr);
}
execvp(t->cmd, t->args.s);
if (dflag) {
fprintf(stderr,
"cc: execvp %s: %s\n",
t->cmd,
strerror(errno));
}
abort();
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 (Eflag)
return CC1;
if (dot) {
if (!strcmp(dot, ".c"))
return CC1;
if (!strcmp(dot, ".ir"))
return CC2;
if (!strcmp(dot, ".qbe"))
return QBE;
if (!strcmp(dot, ".s"))
return AS;
if (!strcmp(dot, ".o"))
return LD;
if (!strcmp(dot, ".a"))
return LD;
} else if (!strcmp(file, "-")) {
return CC1;
}
die("cc: unrecognized filetype of %s", file);
}
static int
valid(int tool, struct tool *t)
{
int st;
if (waitpid(t->pid, &st, 0) == -1 || WIFSIGNALED(st))
goto internal;
if (WIFEXITED(st) && WEXITSTATUS(st) == 0)
return 1;
if (!failure && (tool == CC1 || tool == LD))
goto fail;
internal:
if (!failure)
fprintf(stderr, "cc:%s: internal error\n", t->bin);
fail:
failure = 1;
return 0;
}
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)
continue;
if (!valid(tool, t))
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 || Mflag)
nexttool = LAST_TOOL;
else
nexttool = kflag ? TEEIR : CC2;
break;
case TEEIR:
nexttool = CC2;
break;
case CC2:
if (Qflag)
nexttool = kflag ? TEEQBE : QBE;
else
nexttool = (Sflag || kflag) ? TEEAS : AS;
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)
{
fputs("usage: cc [options] file...\n", stderr);
exit(1);
}
int
main(int argc, char *argv[])
{
struct items linkchain = { .n = 0, };
int link;
atexit(terminate);
if (!(arch = getenv("ARCH")))
arch = ARCH;
if (!(sys = getenv("SYS")))
sys = SYS;
if (!(abi = getenv("ABI")))
abi = ABI;
if (!(format = getenv("FORMAT")))
format = FORMAT;
if (!(prefix = getenv("SCCPREFIX")))
prefix = PREFIX;
ARGBEGIN {
case 'D':
addarg(CC1, "-D");
addarg(CC1, EARGF(usage()));
break;
case 'M':
Mflag = 1;
addarg(CC1, "-M");
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 'O':
EARGF(usage());
break;
case 'S':
Sflag = 1;
break;
case 'U':
addarg(CC1, "-U");
addarg(CC1, EARGF(usage()));
break;
case 'c':
cflag = 1;
break;
case 'd':
dflag = 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 't':
sys = EARGF(usage());
break;
case 'w':
Wflag = 0;
break;
case 'W':
Wflag = 1;
break;
case 'q':
Qflag = 0;
break;
case 'Q':
Qflag = 1;
break;
case '-':
fprintf(stderr,
"cc: ignored parameter --%s\n", EARGF(usage()));
break;
default:
usage();
} ARGOPERAND {
operand:
newitem(&linkchain, ARGOP());
} ARGEND
for (; *argv; --argc, ++argv)
goto operand;
if (Eflag && linkchain.n == 0)
newitem(&linkchain, "-");
if (Eflag && Mflag ||
(Eflag || Mflag) && (Sflag || kflag) ||
linkchain.n == 0 ||
linkchain.n > 1 && cflag && outfile)
usage();
if (!dflag) {
if ((devnullfd = open("/dev/null", O_WRONLY)) < 0)
fputs("cc: could not open /dev/null\n", stderr);
}
if (!(tmpdir = getenv("TMPDIR")) || !tmpdir[0])
tmpdir = ".";
tmpdirln = strlen(tmpdir);
build(&linkchain, (link = !(Mflag || Eflag || Sflag || cflag)));
if (!(link || cflag))
return failure;
if (link && !failure) {
addarg(LD, xstrdup("-lc"));
addarg(LD, xstrdup("-lcrt"));
spawn(settool(LD, NULL, LAST_TOOL));
validatetools();
}
if (sflag) {
spawn(settool(inittool(STRIP), NULL, LAST_TOOL));
validatetools();
}
return failure;
}