orca/ext/wasm3/platforms/app/main.c

724 lines
19 KiB
C

//
// Wasm3 - high performance WebAssembly interpreter written in C.
//
// Copyright © 2019 Steven Massey, Volodymyr Shymanskyy.
// All rights reserved.
//
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <ctype.h>
#include "wasm3.h"
#include "m3_api_libc.h"
#if defined(d_m3HasWASI) || defined(d_m3HasMetaWASI) || defined(d_m3HasUVWASI)
#include "m3_api_wasi.h"
#define LINK_WASI
#endif
#if defined(d_m3HasTracer)
#include "m3_api_tracer.h"
#endif
// TODO: remove
#include "m3_env.h"
/*
* NOTE: Gas metering/limit only applies to pre-instrumented modules.
* You can generate a metered version from any wasm file automatically, using
* https://github.com/ewasm/wasm-metering
*/
#define GAS_LIMIT 500000000
#define GAS_FACTOR 10000LL
#define MAX_MODULES 16
#define FATAL(msg, ...) { fprintf(stderr, "Error: [Fatal] " msg "\n", ##__VA_ARGS__); goto _onfatal; }
static IM3Environment env;
static IM3Runtime runtime;
static u8* wasm_bins[MAX_MODULES];
static int wasm_bins_qty = 0;
#if defined(GAS_LIMIT)
static int64_t initial_gas = GAS_FACTOR * GAS_LIMIT;
static int64_t current_gas = GAS_FACTOR * GAS_LIMIT;
static bool is_gas_metered = false;
m3ApiRawFunction(metering_usegas)
{
m3ApiGetArg (int32_t, gas)
current_gas -= gas;
if (M3_UNLIKELY(current_gas < 0)) {
m3ApiTrap("[trap] Out of gas");
}
m3ApiSuccess();
}
#endif // GAS_LIMIT
M3Result link_all (IM3Module module)
{
M3Result res;
res = m3_LinkSpecTest (module);
if (res) return res;
res = m3_LinkLibC (module);
if (res) return res;
#if defined(LINK_WASI)
res = m3_LinkWASI (module);
if (res) return res;
#endif
#if defined(d_m3HasTracer)
res = m3_LinkTracer (module);
if (res) return res;
#endif
#if defined(GAS_LIMIT)
res = m3_LinkRawFunction (module, "metering", "usegas", "v(i)", &metering_usegas);
if (!res) {
fprintf(stderr, "Warning: Gas is limited to %0.4f\n", (double)(current_gas) / GAS_FACTOR);
is_gas_metered = true;
}
if (res == m3Err_functionLookupFailed) { res = NULL; }
#endif
return res;
}
const char* modname_from_fn(const char* fn)
{
const char* sep = "/\\:*?";
char c;
while ((c = *sep++)) {
const char* off = strrchr(fn, c) + 1;
fn = (fn < off) ? off : fn;
}
return fn;
}
M3Result repl_load (const char* fn)
{
M3Result result = m3Err_none;
IM3Module module = NULL;
u8* wasm = NULL;
u32 fsize = 0;
FILE* f = fopen (fn, "rb");
if (!f) {
return "cannot open file";
}
fseek (f, 0, SEEK_END);
fsize = ftell(f);
fseek (f, 0, SEEK_SET);
if (fsize < 8) {
result = "file is too small";
goto on_error;
} else if (fsize > 64*1024*1024) {
result = "file is too big";
goto on_error;
}
wasm = (u8*) malloc(fsize);
if (!wasm) {
result = "cannot allocate memory for wasm binary";
goto on_error;
}
if (fread (wasm, 1, fsize, f) != fsize) {
result = "cannot read file";
goto on_error;
}
fclose (f);
f = NULL;
result = m3_ParseModule (env, &module, wasm, fsize);
if (result) goto on_error;
result = m3_LoadModule (runtime, module);
if (result) goto on_error;
m3_SetModuleName(module, modname_from_fn(fn));
result = link_all (module);
if (result) goto on_error;
if (wasm_bins_qty < MAX_MODULES) {
wasm_bins[wasm_bins_qty++] = wasm;
}
return result;
on_error:
m3_FreeModule(module);
if (wasm) free(wasm);
if (f) fclose(f);
return result;
}
M3Result repl_load_hex (u32 fsize)
{
M3Result result = m3Err_none;
if (fsize < 8) {
return "file is too small";
} else if (fsize > 10*1024*1024) {
return "file too big";
}
u8* wasm = (u8*) malloc(fsize);
if (!wasm) {
return "cannot allocate memory for wasm binary";
}
{ // Load hex data from stdin
u32 wasm_idx = 0;
char hex[3] = { 0, };
int hex_idx = 0;
while (wasm_idx < fsize) {
int c = fgetc(stdin);
if (!isxdigit(c)) continue; // Skip non-hex chars
hex[hex_idx++] = c;
if (hex_idx == 2) {
int val = strtol(hex, NULL, 16);
wasm[wasm_idx++] = val;
hex_idx = 0;
}
}
if (!fgets(hex, 3, stdin)) // Consume a newline
return "cannot read EOL";
}
IM3Module module;
result = m3_ParseModule (env, &module, wasm, fsize);
if (result) return result;
result = m3_LoadModule (runtime, module);
if (result) return result;
result = link_all (module);
return result;
}
void print_gas_used()
{
#if defined(GAS_LIMIT)
if (is_gas_metered) {
fprintf(stderr, "Gas used: %0.4f\n", (double)(initial_gas - current_gas) / GAS_FACTOR);
}
#endif
}
void print_backtrace()
{
IM3BacktraceInfo info = m3_GetBacktrace(runtime);
if (!info) {
return;
}
fprintf(stderr, "==== wasm backtrace:");
int frameCount = 0;
IM3BacktraceFrame curr = info->frames;
while (curr)
{
fprintf(stderr, "\n %d: 0x%06x - %s!%s",
frameCount, curr->moduleOffset,
m3_GetModuleName (m3_GetFunctionModule(curr->function)),
m3_GetFunctionName (curr->function)
);
curr = curr->next;
frameCount++;
}
if (info->lastFrame == M3_BACKTRACE_TRUNCATED) {
fprintf(stderr, "\n (truncated)");
}
fprintf(stderr, "\n");
}
M3Result repl_call (const char* name, int argc, const char* argv[])
{
IM3Function func;
M3Result result = m3_FindFunction (&func, runtime, name);
if (result) return result;
if (argc && (!strcmp(name, "main") || !strcmp(name, "_main"))) {
return "passing arguments to libc main() not implemented";
}
if (!strcmp(name, "_start")) {
#if defined(LINK_WASI)
// Strip wasm file path
if (argc > 0) {
argv[0] = modname_from_fn(argv[0]);
}
m3_wasi_context_t* wasi_ctx = m3_GetWasiContext();
wasi_ctx->argc = argc;
wasi_ctx->argv = argv;
result = m3_CallArgv(func, 0, NULL);
print_gas_used();
if (result == m3Err_trapExit) {
exit(wasi_ctx->exit_code);
}
return result;
#else
return "WASI not linked";
#endif
}
int arg_count = m3_GetArgCount(func);
int ret_count = m3_GetRetCount(func);
if (argc < arg_count) {
return "not enough arguments";
} else if (argc > arg_count) {
return "too many arguments";
}
result = m3_CallArgv (func, argc, argv);
print_gas_used();
if (result) return result;
static uint64_t valbuff[128];
static const void* valptrs[128];
memset(valbuff, 0, sizeof(valbuff));
for (int i = 0; i < ret_count; i++) {
valptrs[i] = &valbuff[i];
}
result = m3_GetResults (func, ret_count, valptrs);
if (result) return result;
if (ret_count <= 0) {
fprintf (stderr, "Result: <Empty Stack>\n");
}
for (int i = 0; i < ret_count; i++) {
switch (m3_GetRetType(func, i)) {
case c_m3Type_i32: fprintf (stderr, "Result: %" PRIi32 "\n", *(i32*)valptrs[i]); break;
case c_m3Type_i64: fprintf (stderr, "Result: %" PRIi64 "\n", *(i64*)valptrs[i]); break;
# if d_m3HasFloat
case c_m3Type_f32: fprintf (stderr, "Result: %" PRIf32 "\n", *(f32*)valptrs[i]); break;
case c_m3Type_f64: fprintf (stderr, "Result: %" PRIf64 "\n", *(f64*)valptrs[i]); break;
# endif
default: return "unknown return type";
}
}
return result;
}
// :invoke is used by spec tests, so it treats floats as raw data
M3Result repl_invoke (const char* name, int argc, const char* argv[])
{
IM3Function func;
M3Result result = m3_FindFunction (&func, runtime, name);
if (result) return result;
int arg_count = m3_GetArgCount(func);
int ret_count = m3_GetRetCount(func);
if (argc > 128) {
return "arguments limit reached";
} else if (argc < arg_count) {
return "not enough arguments";
} else if (argc > arg_count) {
return "too many arguments";
}
static uint64_t valbuff[128];
static const void* valptrs[128];
memset(valbuff, 0, sizeof(valbuff));
memset(valptrs, 0, sizeof(valptrs));
for (int i = 0; i < argc; i++) {
u64* s = &valbuff[i];
valptrs[i] = s;
switch (m3_GetArgType(func, i)) {
case c_m3Type_i32:
case c_m3Type_f32: *(u32*)(s) = strtoul(argv[i], NULL, 10); break;
case c_m3Type_i64:
case c_m3Type_f64: *(u64*)(s) = strtoull(argv[i], NULL, 10); break;
default: return "unknown argument type";
}
}
result = m3_Call (func, argc, valptrs);
if (result) return result;
// reuse valbuff for return values
memset(valbuff, 0, sizeof(valbuff));
for (int i = 0; i < ret_count; i++) {
valptrs[i] = &valbuff[i];
}
result = m3_GetResults (func, ret_count, valptrs);
if (result) return result;
fprintf (stderr, "Result: ");
if (ret_count <= 0) {
fprintf (stderr, "<Empty Stack>");
}
for (int i = 0; i < ret_count; i++) {
switch (m3_GetRetType(func, i)) {
case c_m3Type_i32: fprintf (stderr, "%" PRIu32 ":i32", *(u32*)valptrs[i]); break;
case c_m3Type_f32: fprintf (stderr, "%" PRIu32 ":f32", *(u32*)valptrs[i]); break;
case c_m3Type_i64: fprintf (stderr, "%" PRIu64 ":i64", *(u64*)valptrs[i]); break;
case c_m3Type_f64: fprintf (stderr, "%" PRIu64 ":f64", *(u64*)valptrs[i]); break;
default: return "unknown return type";
}
if (i != ret_count-1) {
fprintf (stderr, ", ");
}
}
fprintf (stderr, "\n");
return result;
}
M3Result repl_global_get (const char* name)
{
IM3Global g = m3_FindGlobal(runtime->modules, name);
M3TaggedValue tagged;
M3Result err = m3_GetGlobal (g, &tagged);
if (err) return err;
switch (tagged.type) {
case c_m3Type_i32: fprintf (stderr, "%" PRIu32 ":i32\n", tagged.value.i32); break;
case c_m3Type_i64: fprintf (stderr, "%" PRIu64 ":i64\n", tagged.value.i64); break;
case c_m3Type_f32: fprintf (stderr, "%" PRIf32 ":f32\n", tagged.value.f32); break;
case c_m3Type_f64: fprintf (stderr, "%" PRIf64 ":f64\n", tagged.value.f64); break;
default: return m3Err_invalidTypeId;
}
return m3Err_none;
}
M3Result repl_global_set (const char* name, const char* value)
{
IM3Global g = m3_FindGlobal(runtime->modules, name);
M3TaggedValue tagged = {
.type = m3_GetGlobalType(g)
};
switch (tagged.type) {
case c_m3Type_i32: tagged.value.i32 = strtoul(value, NULL, 10); break;
case c_m3Type_i64: tagged.value.i64 = strtoull(value, NULL, 10); break;
case c_m3Type_f32: tagged.value.f32 = strtod(value, NULL); break;
case c_m3Type_f64: tagged.value.f64 = strtod(value, NULL); break;
default: return m3Err_invalidTypeId;
}
return m3_SetGlobal (g, &tagged);
}
M3Result repl_compile ()
{
return m3_CompileModule(runtime->modules);
}
M3Result repl_dump ()
{
uint32_t len;
uint8_t* mem = m3_GetMemory(runtime, &len, 0);
if (mem) {
FILE* f = fopen ("wasm3_dump.bin", "wb");
if (!f) {
return "cannot open file";
}
if (fwrite (mem, 1, len, f) != len) {
return "cannot write file";
}
fclose (f);
}
return m3Err_none;
}
void repl_free ()
{
if (runtime) {
m3_FreeRuntime (runtime);
runtime = NULL;
}
for (int i = 0; i < wasm_bins_qty; i++) {
free (wasm_bins[i]);
wasm_bins[i] = NULL;
}
}
M3Result repl_init (unsigned stack)
{
repl_free();
runtime = m3_NewRuntime (env, stack, NULL);
if (runtime == NULL) {
return "m3_NewRuntime failed";
}
return m3Err_none;
}
static
void unescape(char* buff)
{
char* outp = buff;
while (*buff) {
if (*buff == '\\') {
switch (*(buff+1)) {
case '0': *outp++ = '\0'; break;
case 'b': *outp++ = '\b'; break;
case 'n': *outp++ = '\n'; break;
case 'r': *outp++ = '\r'; break;
case 't': *outp++ = '\t'; break;
case 'x': {
char hex[3] = { *(buff+2), *(buff+3), '\0' };
*outp = strtol(hex, NULL, 16);
buff += 2; outp += 1;
break;
}
// Otherwise just pass the letter
// Also handles '\\'
default: *outp++ = *(buff+1); break;
}
buff += 2;
} else {
*outp++ = *buff++;
}
}
*outp = '\0';
}
static
int split_argv(char *str, char** argv)
{
int result = 0;
char* curr = str;
int len = 0;
for (int i = 0; str[i] != '\0'; i++) {
if (strchr(" \n\r\t", str[i])) {
if (len) { // Found space after non-space
str[i] = '\0';
//unescape(curr); // TODO: breaks windows build?
argv[result++] = curr;
len = 0;
}
} else {
if (!len) { // Found non-space after space
curr = &str[i];
}
len++;
}
}
argv[result] = NULL;
return result;
}
void print_version() {
const char* wasm3_env = getenv("WASM3");
const char* wasm3_arch = getenv("WASM3_ARCH");
printf("Wasm3 v" M3_VERSION "%s on %s\n",
(wasm3_arch || wasm3_env) ? " self-hosting" : "",
wasm3_arch ? wasm3_arch : M3_ARCH);
printf("Build: " __DATE__ " " __TIME__ ", " M3_COMPILER_VER "\n");
}
void print_usage() {
puts("Usage:");
puts(" wasm3 [options] <file> [args...]");
puts(" wasm3 --repl [file]");
puts("Options:");
puts(" --func <function> function to run default: _start");
puts(" --stack-size <size> stack size in bytes default: 64KB");
puts(" --compile disable lazy compilation");
puts(" --dump-on-trap dump wasm memory");
puts(" --gas-limit set gas limit");
}
#define ARGV_SHIFT() { i_argc--; i_argv++; }
#define ARGV_SET(x) { if (i_argc > 0) { x = i_argv[0]; ARGV_SHIFT(); } }
int main (int i_argc, const char* i_argv[])
{
M3Result result = m3Err_none;
env = m3_NewEnvironment ();
runtime = NULL;
bool argRepl = false;
bool argDumpOnTrap = false;
bool argCompile = false;
const char* argFile = NULL;
const char* argFunc = "_start";
unsigned argStackSize = 64*1024;
// m3_PrintM3Info ();
ARGV_SHIFT(); // Skip executable name
while (i_argc > 0)
{
const char* arg = i_argv[0];
if (arg[0] != '-') break;
ARGV_SHIFT();
if (!strcmp("--help", arg) or !strcmp("-h", arg)) {
print_usage();
return 0;
} else if (!strcmp("--version", arg)) {
print_version();
return 0;
} else if (!strcmp("--repl", arg)) {
argRepl = true;
} else if (!strcmp("--dump-on-trap", arg)) {
argDumpOnTrap = true;
} else if (!strcmp("--compile", arg)) {
argCompile = true;
} else if (!strcmp("--stack-size", arg)) {
const char* tmp = "65536";
ARGV_SET(tmp);
argStackSize = atol(tmp);
} else if (!strcmp("--gas-limit", arg)) {
const char* tmp = "0";
ARGV_SET(tmp);
initial_gas = current_gas = GAS_FACTOR * atol(tmp);
} else if (!strcmp("--dir", arg)) {
const char* argDir;
ARGV_SET(argDir);
(void)argDir;
} else if (!strcmp("--func", arg) or !strcmp("-f", arg)) {
ARGV_SET(argFunc);
}
}
if ((argRepl and (i_argc > 1)) or // repl supports 0 or 1 args
(not argRepl and (i_argc < 1)) // normal expects at least 1
) {
print_usage();
return 1;
}
ARGV_SET(argFile);
result = repl_init(argStackSize);
if (result) FATAL("repl_init: %s", result);
if (argFile) {
result = repl_load(argFile);
if (result) FATAL("repl_load: %s", result);
if (argCompile) {
repl_compile();
}
if (argFunc and not argRepl) {
if (!strcmp(argFunc, "_start")) {
// When passing args to WASI, include wasm filename as argv[0]
result = repl_call(argFunc, i_argc+1, i_argv-1);
} else {
result = repl_call(argFunc, i_argc, i_argv);
}
if (result) {
if (argDumpOnTrap) {
repl_dump();
}
print_backtrace();
goto _onfatal;
}
}
}
while (argRepl)
{
char cmd_buff[2048] = { 0, };
char* argv[32] = { 0, };
fprintf(stdout, "wasm3> ");
fflush(stdout);
if (!fgets(cmd_buff, sizeof(cmd_buff), stdin)) {
return 0;
}
int argc = split_argv(cmd_buff, argv);
if (argc <= 0) {
continue;
}
result = m3Err_none;
if (!strcmp(":init", argv[0])) {
result = repl_init(argStackSize);
} else if (!strcmp(":version", argv[0])) {
print_version();
} else if (!strcmp(":exit", argv[0])) {
repl_free();
return 0;
} else if (!strcmp(":load", argv[0])) { // :load <filename>
result = repl_load(argv[1]);
} else if (!strcmp(":load-hex", argv[0])) { // :load-hex <size>\n <hex-encoded-binary>
result = repl_load_hex(atol(argv[1]));
} else if (!strcmp(":get-global", argv[0])) {
result = repl_global_get(argv[1]);
} else if (!strcmp(":set-global", argv[0])) {
result = repl_global_set(argv[1], argv[2]);
} else if (!strcmp(":dump", argv[0])) {
result = repl_dump();
} else if (!strcmp(":compile", argv[0])) {
result = repl_compile();
} else if (!strcmp(":invoke", argv[0])) {
unescape(argv[1]);
result = repl_invoke(argv[1], argc-2, (const char**)(argv+2));
} else if (argv[0][0] == ':') {
result = "no such command";
} else {
unescape(argv[0]);
result = repl_call(argv[0], argc-1, (const char**)(argv+1));
if (result) {
print_backtrace();
}
}
if (result == m3Err_trapExit) {
//TODO: fprintf(stderr, M3_ARCH "-wasi: exit(%d)\n", runtime->exit_code);
} else if (result) {
fprintf (stderr, "Error: %s", result);
M3ErrorInfo info;
m3_GetErrorInfo (runtime, &info);
fprintf (stderr, " (%s)\n", info.message);
}
}
_onfatal:
if (result) {
fprintf (stderr, "Error: %s", result);
if (runtime)
{
M3ErrorInfo info;
m3_GetErrorInfo (runtime, &info);
if (strlen(info.message)) {
fprintf (stderr, " (%s)", info.message);
}
}
fprintf (stderr, "\n");
}
m3_FreeRuntime (runtime);
m3_FreeEnvironment (env);
return result ? 1 : 0;
}