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Make terminal ui binaries work well everywhere

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Here's some screenshots of an emulator tui program that was compiled on
Linux, then scp'd it to Windows, Mac, and FreeBSD.

https://justine.storage.googleapis.com/blinkenlights-cmdexe.png
https://justine.storage.googleapis.com/blinkenlights-imac.png
https://justine.storage.googleapis.com/blinkenlights-freebsd.png
https://justine.storage.googleapis.com/blinkenlights-lisp.png

How is this even possible that we have a nontrivial ui binary that just
works on Mac, Windows, Linux, and BSD? Surely a first ever achievement.

Fixed many bugs. Bootstrapped John McCarthy's metacircular evaluator on
bare metal in half the size of Altair BASIC (about 2.5kb) and ran it in
emulator for fun and profit.
This commit is contained in:
Justine Tunney
2020-10-10 21:18:53 -07:00
parent 680daf1210
commit 9e3e985ae5
276 changed files with 7026 additions and 3790 deletions
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36
libc/calls/now.c
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@@ -31,13 +31,7 @@ static struct Now {
bool once;
uint64_t k0;
long double r0, cpn;
} now_;
/**
* Returns timestamp without needing system calls.
* @note uses microsecond scale fallback on k8 or vm
*/
long double (*nowl)(void);
} g_now;
static long double GetTimeSample(void) {
uint64_t tick1, tick2;
@@ -48,7 +42,7 @@ static long double GetTimeSample(void) {
nanosleep(&(struct timespec){0, 100000}, NULL);
time2 = dtime(CLOCK_MONOTONIC);
tick2 = rdtsc();
return (time2 - time1) * 1e9 / (tick2 - tick1);
return (time2 - time1) * 1e9 / MAX(1, tick2 - tick1);
}
static long double MeasureNanosPerCycle(void) {
@@ -62,15 +56,15 @@ static long double MeasureNanosPerCycle(void) {
}
static void InitTime(void) {
now_.cpn = MeasureNanosPerCycle();
now_.r0 = dtime(CLOCK_REALTIME);
now_.k0 = rdtsc();
now_.once = true;
g_now.cpn = MeasureNanosPerCycle();
g_now.r0 = dtime(CLOCK_REALTIME);
g_now.k0 = rdtsc();
g_now.once = true;
}
long double converttickstonanos(uint64_t ticks) {
if (!now_.once) InitTime();
return ticks * now_.cpn; /* pico scale */
if (!g_now.once) InitTime();
return ticks * g_now.cpn; /* pico scale */
}
long double converttickstoseconds(uint64_t ticks) {
@@ -83,15 +77,7 @@ long double nowl$sys(void) {
long double nowl$art(void) {
uint64_t ticks;
if (!now_.once) InitTime();
ticks = unsignedsubtract(rdtsc(), now_.k0);
return now_.r0 + converttickstoseconds(ticks);
if (!g_now.once) InitTime();
ticks = unsignedsubtract(rdtsc(), g_now.k0);
return g_now.r0 + converttickstoseconds(ticks);
}
INITIALIZER(301, _init_nowl, {
if (X86_HAVE(INVTSC)) {
nowl = nowl$art;
} else {
nowl = nowl$sys;
}
})