Add chibicc

This program popped up on Hacker News recently. It's the only modern
compiler I've ever seen that doesn't have dependencies and is easily
modified. So I added all of the missing GNU extensions I like to use
which means it might be possible soon to build on non-Linux and have
third party not vendor gcc binaries.
This commit is contained in:
Justine Tunney 2020-12-05 12:20:41 -08:00
parent e44a0cf6f8
commit 8da931a7f6
298 changed files with 19493 additions and 11950 deletions

132
third_party/chibicc/test/asm_test.c vendored Normal file
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/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi
Copyright 2020 Justine Alexandra Roberts Tunney
Permission to use, copy, modify, and/or distribute this software for
any purpose with or without fee is hereby granted, provided that the
above copyright notice and this permission notice appear in all copies.
THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL
WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE
AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
PERFORMANCE OF THIS SOFTWARE.
*/
#include "third_party/chibicc/test/test.h"
char *asm_fn1(void) {
asm("mov\t$50,%rax\n\t"
"mov\t%rbp,%rsp\n\t"
"leave\n\t"
"ret");
}
char *asm_fn2(void) {
asm inline volatile("mov\t$55,%rax\n\t"
"mov\t%rbp,%rsp\n\t"
"leave\n\t"
"ret");
}
void *repmovsb(void *dst, void *src, unsigned long n) {
asm("rep movsb"
: "=D"(dst), "=S"(src), "=c"(n), "=m"(*(char(*)[n])dst)
: "0"(dst), "1"(src), "2"(n), "m"(*(const char(*)[n])src));
return dst;
}
void *repmovsbeax(void *dst, void *src, unsigned long n) {
void *res;
asm("rep movsb\n\t"
"xchg\t%0,%1"
: "=a"(res), "=D"(dst), "=S"(src), "=c"(n), "=m"(*(char(*)[n])dst)
: "1"(dst), "2"(src), "3"(n), "m"(*(const char(*)[n])src)
: "rbx", "rbp", "r12", "r13", "r14", "r15", "cc");
return res;
}
void testSmashStackFrame_clobberIsRestored(void) {
asm volatile("xor\t%%ebp,%%ebp"
: /* no outputs */
: /* no inputs */
: "rbp", "cc");
}
void testFlagOutputs(void) {
bool zf, cf, sf;
asm("xor\t%%eax,%%eax\n\t"
"inc\t%%eax"
: "=@ccz"(zf), "=@ccs"(cf)
: /* no inputs */
: "rax");
ASSERT(false, zf);
ASSERT(false, sf);
asm("xor\t%%eax,%%eax\n\t"
"dec\t%%eax"
: "=@ccz"(zf), "=@ccs"(cf)
: /* no inputs */
: "rax");
ASSERT(false, zf);
ASSERT(true, sf);
asm("xor\t%%eax,%%eax\n\t"
"cmc"
: "=@ccz"(zf), "=@ccc"(cf), "=@ccs"(sf)
: /* no inputs */
: "rax");
ASSERT(true, zf);
ASSERT(true, cf);
ASSERT(false, sf);
}
int main() {
ASSERT(50, asm_fn1());
ASSERT(55, asm_fn2());
{
char buf[] = "HELLO";
char *s = "hello";
char *p = repmovsb(buf, s, 4);
ASSERT(4, p - buf);
ASSERT('h', buf[0]);
ASSERT('e', buf[1]);
ASSERT('l', buf[2]);
ASSERT('l', buf[3]);
ASSERT('O', buf[4]);
}
{
char buf[] = "HELLO";
char *s = "hello";
char *p = repmovsbeax(buf, s, 4);
ASSERT(4, p - buf);
ASSERT('h', buf[0]);
ASSERT('e', buf[1]);
ASSERT('l', buf[2]);
ASSERT('l', buf[3]);
ASSERT('O', buf[4]);
}
testSmashStackFrame_clobberIsRestored();
short v1[8] = {0, 1, 2, 3, 4, 5, 6, 7};
short v2[8] = {1, 1, 1, 1, 1, 1, 1, 1};
short v3[8] = {2, 2, 2, 2, 2, 2, 2, 2};
asm("paddsw\t%1,%0\n\t"
"paddsw\t%2,%0"
: "+x"(v1)
: "xm"(v2), "xm"(v3));
ASSERT(3, v1[0]);
ASSERT(4, v1[1]);
ASSERT(5, v1[2]);
ASSERT(6, v1[3]);
ASSERT(7, v1[4]);
ASSERT(8, v1[5]);
ASSERT(9, v1[6]);
ASSERT(10, v1[7]);
return 0;
}