ref: da15338f25bea8abab12d0eb8ac9ccf1881ae288
dir: /driver/posix/scc.c/
/* See LICENSE file for copyright and license details. */
#define _POSIX_SOURCE
#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"
#define NARGS 64
enum {
CC1,
CC2,
QBE,
AS,
TEE,
NR_TOOLS,
};
static struct tool {
char cmd[PATH_MAX];
char *args[NARGS];
char bin[16];
int nargs, in, out;
pid_t pid;
} tools[NR_TOOLS] = {
[CC1] = { .bin = "cc1", .cmd = PREFIX "/libexec/scc/", },
[CC2] = { .bin = "cc2", .cmd = PREFIX "/libexec/scc/", },
[QBE] = { .bin = "qbe", .cmd = "qbe", },
[AS] = { .bin = "as", .cmd = "as", },
[TEE] = { .bin = "tee", .cmd = "tee", },
};
char *argv0;
static char *arch;
static char *outfiles[NR_TOOLS + 1];
static int failedtool = NR_TOOLS;
static int Eflag, Sflag, kflag;
static void
cleanup(void)
{
int i;
for (i = 0; i < NR_TOOLS + 1; ++i) {
if (outfiles[i]) {
if (i > failedtool)
unlink(outfiles[i]);
free(outfiles[i]);
outfiles[i] = NULL;
}
}
}
static void
terminate(void)
{
int i;
for (i = 0; i < NR_TOOLS; ++i) {
if (tools[i].pid)
kill(tools[i].pid, SIGTERM);
}
cleanup();
}
static int
inittool(int tool)
{
struct tool *t = &tools[tool];
size_t binln;
int n;
if (!t->args[0]) {
switch (tool) {
case CC1:
case CC2:
binln = strlen(t->bin);
if (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 AS:
t->nargs = 2;
t->args[1] = "-o";
break;
default:
break;
}
t->args[0] = t->bin;
}
return tool;
}
static char *
newfileext(char *name, char *ext)
{
char *new, *dot;
size_t newsz, nameln = strlen(name);
int n;
if (!(dot = strrchr(name, '.')))
dot = &name[nameln];
nameln = nameln - strlen(dot);
newsz = nameln + strlen(ext) + 1 + 1;
new = xmalloc(newsz);
n = snprintf(new, newsz, "%.*s.%s", nameln, name, ext);
if (n < 0 || n >= newsz)
die("scc: wrong output filename");
return new;
}
static int
settool(int tool, char *input, int output)
{
struct tool *t = &tools[tool];
int fds[2];
char *ext;
static int fdin;
switch (tool) {
case AS:
outfiles[output] = newfileext(input, "o");
t->args[t->nargs] = outfiles[output];
t->args[3] = NULL;
break;
case TEE:
switch (output) {
case CC2:
ext = "ir"; break;
case QBE:
ext = "qbe"; break;
case NR_TOOLS:
if (!Sflag)
break;
case AS:
ext = "as"; break;
}
outfiles[output] = newfileext(input, ext);
t->args[1] = outfiles[output];
break;
default:
break;
}
if (fdin) {
t->in = fdin;
fdin = 0;
} else {
t->args[t->nargs + 1] = input;
}
if (output < NR_TOOLS) {
if (pipe(fds))
die("scc: pipe: %s", strerror(errno));
t->out = fds[1];
fdin = fds[0];
}
return tool;
}
static void
spawn(int t)
{
struct tool *tool = &tools[t];
switch (tool->pid = fork()) {
case -1:
die("scc: %s: %s", tool->bin, strerror(errno));
case 0:
if (tool->out)
dup2(tool->out, 1);
if (tool->in)
dup2(tool->in, 0);
execvp(tool->cmd, tool->args);
fprintf(stderr, "scc: execp %s: %s\n",
tool->cmd, strerror(errno));
_exit(1);
default:
if (tool->in)
close(tool->in);
if (tool->out)
close(tool->out);
break;
}
}
static int
toolfor(char *file)
{
char *dot = strrchr(file, '.');
if (dot) {
if (!strcmp(dot, ".c"))
return CC1;
if (!strcmp(dot, ".qbe"))
return QBE;
if (!strcmp(dot, ".as"))
return AS;
}
die("scc: do not recognize filetype of %s", file);
}
static void
build(char *file)
{
pid_t pid;
int i, st, tool, out, keepfile;
static int preout;
for (tool = toolfor(file); tool < NR_TOOLS; tool = out) {
keepfile = 0;
switch (tool) {
case CC1:
out = Eflag ? NR_TOOLS : CC2;
if (!Eflag)
keepfile = kflag;
break;
case CC2:
if (!arch || strcmp(arch, "qbe")) {
out = Sflag ? NR_TOOLS : AS;
keepfile = (Sflag || kflag);
} else {
out = QBE;
keepfile = kflag;
}
break;
case QBE:
out = Sflag ? NR_TOOLS : AS;
keepfile = (Sflag || kflag);
break;
case AS:
out = NR_TOOLS;
break;
case TEE:
out = preout;
break;
default:
break;
}
if (keepfile) {
preout = out;
out = TEE;
}
spawn(settool(inittool(tool), file, out));
}
for (i = 0; i < NR_TOOLS; ++i) {
if ((pid = tools[i].pid) == 0)
continue;
if (waitpid(pid, &st, 0) < 0) {
failedtool = i;
exit(-1);
}
tools[i].pid = 0;
if (!WIFEXITED(st) || WEXITSTATUS(st) != 0) {
failedtool = i;
exit(-1);
}
}
cleanup();
}
static void
addarg(int tool, char *arg) {
struct tool *t = &tools[tool];
if (t->nargs >= NARGS - 3) /* 3: argv0, filename, NULL terminator */
die("scc: too many parameters given");
t->args[++t->nargs] = arg;
}
static void
usage(void)
{
die("usage: %s [-E|-kS] [-m arch] [-D macro[=val]]... "
"[-I dir]... file ...", argv0);
}
int
main(int argc, char *argv[])
{
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 'S':
Sflag = 1;
break;
case 'k':
kflag = 1;
break;
case 'm':
arch = EARGF(usage());
break;
case '-':
fprintf(stderr,
"scc: ignored parameter --%s\n", EARGF(usage()));
break;
default:
usage();
} ARGEND
if (Eflag && (Sflag || kflag))
usage();
if (!argc)
die("scc: fatal error: no input file");
for (; *argv; ++argv)
build(*argv);
return 0;
}