ref: 6f62daf42e5a640e1250ae7322d920a9d6ae81fa
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,
TEEIR,
CC2,
TEEQBE,
QBE,
TEEAS,
AS,
LD,
LAST_TOOL,
};
static struct tool {
char cmd[PATH_MAX];
char *args[NARGS];
char bin[16];
char *outfile;
int nargs, in, out, error;
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 replace with ld */
};
char *argv0;
static char *arch;
static char *tmpobjs[NARGS - 2];
static int nobjs;
static int Eflag, Sflag, kflag;
static void
terminate(void)
{
struct tool *t;
int tool, failed;
for (tool = 0; tool < LAST_TOOL; ++tool) {
t = &tools[tool];
if (t->pid) {
kill(t->pid, SIGTERM);
if (t->error)
failed = tool;
if (tool >= failed && t->outfile)
unlink(t->outfile);
}
}
}
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;
case LD:
t->nargs = 2;
t->args[1] = "-o";
break;
default:
break;
}
t->args[0] = t->bin;
}
return tool;
}
static char *
outfilename(char *path, char *ext)
{
char *new, *name, *dot;
size_t newsz, nameln;
int n;
if (!(name = strrchr(path, '/')))
name = path;
else
++name;
nameln = strlen(name);
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 void
addarg(int tool, char *arg) {
struct tool *t = &tools[tool];
if (!(t->nargs < NARGS - 2)) /* 2: argv0, NULL terminator */
die("scc: too many parameters given");
t->args[++t->nargs] = arg;
}
static int
settool(int tool, char *infile, int nexttool)
{
struct tool *t = &tools[tool];
int fds[2];
static int fdin;
switch (tool) {
case TEEIR:
t->outfile = outfilename(infile, "ir");
t->args[1] = t->outfile;
break;
case TEEQBE:
t->outfile = outfilename(infile, "qbe");
t->args[1] = t->outfile;
break;
case TEEAS:
t->outfile = outfilename(infile, "as");
t->args[1] = t->outfile;
break;
case AS:
t->outfile = outfilename(infile, "o");
t->args[2] = t->outfile;
break;
case LD:
if (!t->outfile)
t->outfile = xstrdup("a.out");
t->args[2] = t->outfile;
break;
default:
break;
}
if (fdin) {
t->in = fdin;
fdin = 0;
} else {
t->args[t->nargs + 1] = infile;
}
if (nexttool < LAST_TOOL && tool != AS) {
if (pipe(fds))
die("scc: pipe: %s", strerror(errno));
t->out = fds[1];
fdin = fds[0];
}
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)
dup2(t->out, 1);
if (t->in)
dup2(t->in, 0);
execvp(t->cmd, t->args);
fprintf(stderr, "scc: execvp %s: %s\n",
t->cmd, strerror(errno));
_exit(1);
default:
if (t->in)
close(t->in);
if (t->out)
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 void
validatetools(void)
{
struct tool *t;
int tool, st;
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) {
t->error = 1;
exit(-1);
}
free(t->outfile);
t->outfile = NULL;
t->pid = 0;
t->error = 0;
}
}
}
static void
linkobjs(void)
{
int i;
settool(inittool(LD), NULL, LAST_TOOL);
for (i = 0; tmpobjs[i] && i < nobjs; ++i)
addarg(LD, tmpobjs[i]);
spawn(LD);
validatetools();
if (kflag)
return;
for (i = 0; i < nobjs; ++i)
unlink(tmpobjs[i]);
}
static void
build(char *file)
{
int tool = toolfor(file), nexttool, argfile = (tool == LD) ? 1 : 0;
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 = LD;
break;
case LD: /* FALLTHROUGH */
if (argfile)
addarg(LD, file);
else
tmpobjs[nobjs++] = xstrdup(tools[AS].outfile);
default:
nexttool = LAST_TOOL;
continue;
}
spawn(settool(inittool(tool), file, nexttool));
}
validatetools();
}
static void
usage(void)
{
die("usage: %s [-E|-kS] [-w] [-m arch] [-o binout]\n"
" [-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 'o':
tools[LD].outfile = EARGF(usage());
break;
case 'w':
addarg(CC1, "-w");
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);
if (!(Eflag || Sflag))
linkobjs();
return 0;
}