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Make terminal ui binaries work well everywhere

Browse source 
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
Download patch file Download diff file Expand all files Collapse all files

47
libc/runtime/ftrace.greg.c
View file

@ -24,6 +24,7 @@
#include "libc/calls/internal.h"
#include "libc/calls/struct/sigset.h"
#include "libc/dce.h"
#include "libc/intrin/repmovsb.h"
#include "libc/macros.h"
#include "libc/nexgen32e/stackframe.h"
#include "libc/nt/files.h"
@ -50,7 +51,7 @@ static char g_buf[512];
static const char *g_lastsymbol;
static struct SymbolTable *g_symbols;
forceinline int getnestinglevel(struct StackFrame *frame) {
forceinline int GetNestingLevel(struct StackFrame *frame) {
int nesting = -2;
while (frame) {
++nesting;
@ -81,7 +82,7 @@ privileged interruptfn void ftrace_hook(void) {
frame->addr - g_symbols->addr_base)]
.name_rva];
if (symbol != g_lastsymbol &&
(nesting = getnestinglevel(frame)) * 2 < ARRAYLEN(g_buf) - 3) {
(nesting = GetNestingLevel(frame)) * 2 < ARRAYLEN(g_buf) - 4) {
i = 2;
j = 0;
while (nesting--) {
@ -91,6 +92,7 @@ privileged interruptfn void ftrace_hook(void) {
while (i < ARRAYLEN(g_buf) - 2 && symbol[j]) {
g_buf[i++] = symbol[j++];
}
g_buf[i++] = '\r';
g_buf[i++] = '\n';
__print(g_buf, i);
}
@ -100,13 +102,42 @@ privileged interruptfn void ftrace_hook(void) {
}
/**
* Installs plaintext function tracer. Do not call.
* Enables plaintext function tracing if --ftrace flag passed.
*
* The --ftrace CLI arg is removed before main() is called. This
* code is intended for diagnostic purposes and assumes binaries
* are trustworthy and stack isn't corrupted. Logging plain text
* allows program structure to easily be visualized and hotspots
* identified w/ sed | sort | uniq -c | sort. A compressed trace
* can be made by appending --ftrace 2>&1 | gzip -4 >trace.gz to
* the CLI arguments. Have fun.
*
* @see libc/runtime/_init.S for documentation
*/
textstartup void ftrace_init(void) {
g_buf[0] = '+';
g_buf[1] = ' ';
if ((g_symbols = opensymboltable(finddebugbinary()))) {
__hook(ftrace_hook, g_symbols);
textstartup int ftrace_init(int argc, char *argv[]) {
int i;
bool foundflag;
foundflag = false;
for (i = 1; i <= argc; ++i) {
if (!foundflag) {
if (argv[i]) {
if (strcmp(argv[i], "--ftrace") == 0) {
foundflag = true;
} else if (strcmp(argv[i], "----ftrace") == 0) {
strcpy(argv[i], "--ftrace");
}
}
} else {
argv[i - 1] = argv[i];
}
}
if (foundflag) {
--argc;
g_buf[0] = '+';
g_buf[1] = ' ';
if ((g_symbols = OpenSymbolTable(FindDebugBinary()))) {
__hook(ftrace_hook, g_symbols);
}
}
return argc;
}