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Code Issues 1 Releases Wiki Activity

WIP panic functionality.

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This commit is contained in:
Calvin Rose 2019-01-04 23:20:34 -05:00
parent 5afb00859a
commit cd6a7793e8
4 changed files with 169 additions and 151 deletions
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47
src/core/capi.c Normal file
View File

@ -0,0 +1,47 @@
/*
* Copyright (c) 2019 Calvin Rose
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to
* deal in the Software without restriction, including without limitation the
* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*/
#include <janet/janet.h>
#include "state.h"
#include "fiber.h"
void janet_panicv(Janet message) {
if (janet_vm_fiber != NULL) {
janet_fiber_push(janet_vm_fiber, message);
longjmp(janet_vm_fiber->buf, 1);
} else {
fputs((const char *)janet_formatc("janet top level panic - %v\n", message), stdout);
exit(1);
}
}
void janet_panic(const char *message) {
janet_panicv(janet_cstringv(message));
}
void janet_panics(const uint8_t *message) {
janet_panicv(janet_wrap_string(message));
}
void janet_panic_type(Janet x, int32_t n, int expected) {
janet_panicf("bad slot #%d, expected %T, got %t", n, expected, janet_type(x));
}

32
src/core/string.c
View File

@ -619,6 +619,30 @@ JanetBuffer *janet_pretty(JanetBuffer *buffer, int depth, Janet x) {
return S.buffer;
}
static const char *typestr(Janet x) {
JanetType t = janet_type(x);
return (t = JANET_ABSTRACT)
? janet_abstract_type(janet_unwrap_abstract(x))->name
: janet_type_names[t];
}
static void pushtypes(JanetBuffer *buffer, int types) {
int first = 1;
int i = 0;
while (types) {
if (1 & types) {
if (first) {
first = 0;
} else {
janet_buffer_push_u8(buffer, '|');
}
janet_buffer_push_cstring(buffer, janet_type_names[i]);
}
i++;
types >>= 1;
}
}
/* Helper function for formatting strings. Useful for generating error messages and the like.
* Similar to printf, but specialized for operating with janet. */
const uint8_t *janet_formatc(const char *format, ...) {
@ -679,7 +703,13 @@ const uint8_t *janet_formatc(const char *format, ...) {
}
case 't':
{
janet_buffer_push_cstring(bufp, janet_type_names[va_arg(args, JanetType)] + 1);
janet_buffer_push_cstring(bufp, typestr(va_arg(args, Janet)));
break;
}
case 'T':
{
int types = va_arg(args, int32_t);
pushtypes(bufp, types);
break;
}
case 'V':

228
src/core/vm.c
View File

@ -144,6 +144,11 @@ static void *op_lookup[255] = {
pc = janet_stack_frame(stack)->pc; \
func = janet_stack_frame(stack)->func; \
} while (0)
#define vm_return(sig, val) do { \
vm_commit(); \
janet_fiber_push(fiber, (val)); \
return (sig); \
} while (0)
/* Next instruction variations */
#define maybe_collect() do {\
@ -153,7 +158,7 @@ static void *op_lookup[255] = {
#define vm_checkgc_pcnext() maybe_collect(); vm_pcnext()
/* Handle certain errors in main vm loop */
#define vm_throw(e) do { retreg = janet_cstringv(e); goto vm_error; } while (0)
#define vm_throw(e) do { vm_commit(); janet_panic(e); } while (0)
#define vm_assert(cond, e) do {if (!(cond)) vm_throw((e)); } while (0)
#define vm_assert_type(X, T) do { \
if (!(janet_checktype((X), (T)))) { \
@ -216,6 +221,33 @@ static void *op_lookup[255] = {
#define vm_bitop(op) _vm_bitop(op, int32_t)
#define vm_bitopu(op) _vm_bitop(op, uint32_t)
/* Call a non function type */
static Janet call_nonfn(JanetFiber *fiber, Janet callee) {
int status;
int32_t argn = fiber->stacktop - fiber->stackstart;
Janet ds, key, ret;
if (!janet_checktypes(callee, JANET_TFLAG_FUNCLIKE)) {
janet_panicf("attempted to called %v, expected %t", callee,
JANET_TFLAG_CALLABLE);
}
if (argn != 1) janet_panicf("%v called with arity %d, expected 1", argn);
if (janet_checktypes(callee, JANET_TFLAG_INDEXED | JANET_TFLAG_DICTIONARY)) {
ds = callee;
key = fiber->data[fiber->stackstart];
} else {
ds = fiber->data[fiber->stackstart];
key = callee;
}
fiber->stacktop = fiber->stackstart;
status = janet_get(ds, key, &ret);
if (status == -2) {
janet_panic("expected integer key");
} else if (status == -1) {
janet_panic("expected table or struct");
}
return ret;
}
/* Interpreter main loop */
static JanetSignal run_vm(JanetFiber *fiber, Janet in) {
@ -231,9 +263,6 @@ static JanetSignal run_vm(JanetFiber *fiber, Janet in) {
/* Expected types on type error */
uint16_t expected_types;
/* Signal to return when done */
JanetSignal signal = JANET_SIGNAL_OK;
/* Only should be hit if the fiber is either waiting for a child, or
* waiting to be resumed. In those cases, use input and increment pc. We
@ -257,34 +286,28 @@ static JanetSignal run_vm(JanetFiber *fiber, Janet in) {
VM_START();
VM_DEFAULT();
signal = JANET_SIGNAL_DEBUG;
retreg = janet_wrap_nil();
goto vm_exit;
vm_return(JANET_SIGNAL_DEBUG, janet_wrap_nil());
VM_OP(JOP_NOOP)
vm_pcnext();
VM_OP(JOP_ERROR)
retreg = stack[A];
goto vm_error;
janet_panicv(stack[A]);
vm_next(); /* pacify compiler warnings */
VM_OP(JOP_TYPECHECK)
if (!janet_checktypes(stack[A], E)) {
JanetArgs tempargs;
tempargs.n = A + 1;
tempargs.v = stack;
janet_typemany_err(tempargs, A, E);
goto vm_error;
janet_panicf("expected %T, got %t", E, stack[A]);
}
vm_pcnext();
VM_OP(JOP_RETURN)
retreg = stack[D];
goto vm_return;
goto vm_handle_return;
VM_OP(JOP_RETURN_NIL)
retreg = janet_wrap_nil();
goto vm_return;
goto vm_handle_return;
VM_OP(JOP_ADD_IMMEDIATE)
vm_binop_immediate(+);
@ -543,15 +566,17 @@ static JanetSignal run_vm(JanetFiber *fiber, Janet in) {
VM_OP(JOP_CALL)
{
Janet callee = stack[E];
if (fiber->maxstack &&
fiber->stacktop > fiber->maxstack) {
if (fiber->stacktop > fiber->maxstack) {
vm_throw("stack overflow");
}
if (janet_checktype(callee, JANET_FUNCTION)) {
func = janet_unwrap_function(callee);
janet_stack_frame(stack)->pc = pc;
if (janet_fiber_funcframe(fiber, func))
goto vm_arity_error;
if (janet_fiber_funcframe(fiber, func)) {
int32_t n = fiber->stacktop - fiber->stackstart;
janet_panicf("%v called with %d argument%s, expected %d",
callee, n, n > 1 ? "s" : "", func->def->arity);
}
stack = fiber->data + fiber->frame;
pc = func->def->bytecode;
vm_checkgc_next();
@ -562,45 +587,16 @@ static JanetSignal run_vm(JanetFiber *fiber, Janet in) {
retreg = janet_wrap_nil();
args.v = fiber->data + fiber->frame;
args.ret = &retreg;
if (janet_unwrap_cfunction(callee)(args)) {
signal = JANET_SIGNAL_ERROR;
goto vm_exit;
}
vm_commit();
if (janet_unwrap_cfunction(callee)(args)) janet_panicv(retreg);
janet_fiber_popframe(fiber);
if (fiber->frame == 0) goto vm_exit;
if (fiber->frame == 0) vm_return(JANET_SIGNAL_OK, retreg);
stack = fiber->data + fiber->frame;
stack[A] = retreg;
vm_checkgc_pcnext();
} else {
int status;
int32_t argn = fiber->stacktop - fiber->stackstart;
Janet ds, key;
if (janet_checktypes(callee, JANET_TFLAG_INDEXED | JANET_TFLAG_DICTIONARY)) {
if (argn != 1) {
retreg = callee;
goto vm_arity_error_2;
}
ds = callee;
key = fiber->data[fiber->stackstart];
} else if (janet_checktypes(callee, JANET_TFLAG_SYMBOL | JANET_TFLAG_KEYWORD)) {
if (argn != 1) {
retreg = callee;
goto vm_arity_error_2;
}
ds = fiber->data[fiber->stackstart];
key = callee;
} else {
expected_types = JANET_TFLAG_CALLABLE;
retreg = callee;
goto vm_type_error;
}
fiber->stacktop = fiber->stackstart;
status = janet_get(ds, key, stack + A);
if (status == -2) {
vm_throw("expected integer key");
} else if (status == -1) {
vm_throw("expected table or struct");
}
vm_commit();
stack[A] = call_nonfn(fiber, callee);
vm_pcnext();
}
}
@ -610,8 +606,11 @@ static JanetSignal run_vm(JanetFiber *fiber, Janet in) {
Janet callee = stack[D];
if (janet_checktype(callee, JANET_FUNCTION)) {
func = janet_unwrap_function(callee);
if (janet_fiber_funcframe_tail(fiber, func))
goto vm_arity_error;
if (janet_fiber_funcframe_tail(fiber, func)) {
int32_t n = fiber->stacktop - fiber->stackstart;
janet_panicf("%v called with %d argument%s, expected %d",
callee, n, n > 1 ? "s" : "", func->def->arity);
}
stack = fiber->data + fiber->frame;
pc = func->def->bytecode;
vm_checkgc_next();
@ -622,48 +621,19 @@ static JanetSignal run_vm(JanetFiber *fiber, Janet in) {
retreg = janet_wrap_nil();
args.v = fiber->data + fiber->frame;
args.ret = &retreg;
if (janet_unwrap_cfunction(callee)(args)) {
signal = JANET_SIGNAL_ERROR;
goto vm_exit;
}
vm_commit();
if (janet_unwrap_cfunction(callee)(args))
vm_return(JANET_SIGNAL_ERROR, retreg);
janet_fiber_popframe(fiber);
janet_fiber_popframe(fiber);
if (fiber->frame == 0) goto vm_exit;
goto vm_reset;
} else {
int status;
int32_t argn = fiber->stacktop - fiber->stackstart;
Janet ds, key;
if (janet_checktypes(callee, JANET_TFLAG_INDEXED | JANET_TFLAG_DICTIONARY)) {
if (argn != 1) {
retreg = callee;
goto vm_arity_error_2;
}
ds = callee;
key = fiber->data[fiber->stackstart];
} else if (janet_checktypes(callee, JANET_TFLAG_SYMBOL | JANET_TFLAG_KEYWORD)) {
if (argn != 1) {
retreg = callee;
goto vm_arity_error_2;
}
ds = fiber->data[fiber->stackstart];
key = callee;
} else {
expected_types = JANET_TFLAG_CALLABLE;
retreg = callee;
goto vm_type_error;
}
fiber->stacktop = fiber->stackstart;
status = janet_get(ds, key, &retreg);
if (status == -2) {
vm_throw("expected integer key");
} else if (status == -1) {
vm_throw("expected table or struct");
}
janet_fiber_popframe(fiber);
if (fiber->frame == 0) goto vm_exit;
goto vm_reset;
vm_commit();
retreg = call_nonfn(fiber, callee);
}
/* Make it a tail call */
janet_fiber_popframe(fiber);
if (fiber->frame == 0)
vm_return(JANET_SIGNAL_OK, retreg);
goto vm_reset;
}
VM_OP(JOP_RESUME)
@ -672,10 +642,8 @@ static JanetSignal run_vm(JanetFiber *fiber, Janet in) {
JanetFiber *child = janet_unwrap_fiber(stack[B]);
fiber->child = child;
JanetSignal sig = janet_continue(child, stack[C], &retreg);
if (sig != JANET_SIGNAL_OK && !(child->flags & (1 << sig))) {
signal = sig;
goto vm_exit;
}
if (sig != JANET_SIGNAL_OK && !(child->flags & (1 << sig)))
vm_return(sig, retreg);
fiber->child = NULL;
stack[A] = retreg;
vm_checkgc_pcnext();
@ -686,9 +654,7 @@ static JanetSignal run_vm(JanetFiber *fiber, Janet in) {
int32_t s = C;
if (s > JANET_SIGNAL_USER9) s = JANET_SIGNAL_USER9;
if (s < 0) s = 0;
signal = s;
retreg = stack[B];
goto vm_exit;
vm_return(s, stack[B]);
}
VM_OP(JOP_PUT)
@ -838,68 +804,27 @@ static JanetSignal run_vm(JanetFiber *fiber, Janet in) {
}
/* Handle returning from stack frame. Expect return value in retreg */
vm_return:
vm_handle_return:
{
janet_fiber_popframe(fiber);
if (fiber->frame == 0) goto vm_exit;
if (fiber->frame == 0) vm_return(JANET_SIGNAL_OK, retreg);
goto vm_reset;
}
/* Handle function calls with bad arity */
vm_arity_error:
{
int32_t nargs = fiber->stacktop - fiber->stackstart;
retreg = janet_wrap_string(janet_formatc("%v called with %d argument%s, expected %d",
janet_wrap_function(func),
nargs,
nargs == 1 ? "" : "s",
func->def->arity));
signal = JANET_SIGNAL_ERROR;
goto vm_exit;
}
/* Handle calling a data structure, keyword, or symbol with bad arity */
vm_arity_error_2:
{
int32_t nargs = fiber->stacktop - fiber->stackstart;
retreg = janet_wrap_string(janet_formatc("%v called with %d argument%s, expected 1",
retreg,
nargs,
nargs == 1 ? "" : "s"));
signal = JANET_SIGNAL_ERROR;
goto vm_exit;
}
/* Handle type errors. The found type is the type of retreg,
* the expected types are in the expected_types field. */
vm_type_error:
{
JanetBuffer errbuf;
const uint8_t *message;
janet_buffer_init(&errbuf, 10);
janet_buffer_push_cstring(&errbuf, "expected ");
janet_buffer_push_types(&errbuf, expected_types);
janet_buffer_push_cstring(&errbuf, ", got ");
janet_buffer_push_cstring(&errbuf, janet_type_names[janet_type(retreg)]);
retreg = janet_stringv(errbuf.data, errbuf.count);
message = janet_string(errbuf.data, errbuf.count);
janet_buffer_deinit(&errbuf);
signal = JANET_SIGNAL_ERROR;
goto vm_exit;
}
/* Handle errors from c functions and vm opcodes */
vm_error:
{
signal = JANET_SIGNAL_ERROR;
goto vm_exit;
}
/* Exit from vm loop. If signal is not set explicitely, does
* a successful return (JANET_SIGNAL_OK). */
vm_exit:
{
janet_stack_frame(stack)->pc = pc;
janet_fiber_push(fiber, retreg);
return signal;
janet_panics(message);
}
/* Reset state of machine */
@ -951,7 +876,12 @@ JanetSignal janet_continue(JanetFiber *fiber, Janet in, Janet *out) {
janet_fiber_set_status(fiber, JANET_STATUS_ALIVE);
/* Run loop */
JanetSignal signal = run_vm(fiber, in);
JanetSignal signal;
if (setjmp(fiber->buf)) {
signal = JANET_SIGNAL_ERROR;
} else {
signal = run_vm(fiber, in);
}
/* Tear down */
janet_fiber_set_status(fiber, signal);

13
src/include/janet/janet.h
View File

@ -201,6 +201,7 @@ extern "C" {
#include <string.h>
#include <stdlib.h>
#include <stdarg.h>
#include <setjmp.h>
/* Names of all of the types */
extern const char *const janet_type_names[16];
@ -314,11 +315,13 @@ typedef enum JanetType {
/* Some abstractions */
#define JANET_TFLAG_BOOLEAN (JANET_TFLAG_TRUE | JANET_TFLAG_FALSE)
#define JANET_TFLAG_CALLABLE (JANET_TFLAG_FUNCTION | JANET_TFLAG_CFUNCTION)
#define JANET_TFLAG_BYTES (JANET_TFLAG_STRING | JANET_TFLAG_SYMBOL | JANET_TFLAG_BUFFER | JANET_TFLAG_KEYWORD)
#define JANET_TFLAG_INDEXED (JANET_TFLAG_ARRAY | JANET_TFLAG_TUPLE)
#define JANET_TFLAG_DICTIONARY (JANET_TFLAG_TABLE | JANET_TFLAG_STRUCT)
#define JANET_TFLAG_LENGTHABLE (JANET_TFLAG_BYTES | JANET_TFLAG_INDEXED | JANET_TFLAG_DICTIONARY)
#define JANET_TFLAG_CALLABLE (JANET_TFLAG_FUNCTION | JANET_TFLAG_CFUNCTION)
#define JANET_TFLAG_FUNCLIKE (JANET_TFLAG_CALLABLE | JANET_TFLAG_INDEXED | JANET_TFLAG_DICTIONARY | \
JANET_TFLAG_KEYWORD | JANET_TFLAG_SYMBOL)
/* We provide three possible implemenations of Janets. The preferred
* nanboxing approach, for 32 or 64 bits, and the standard C version. Code in the rest of the
@ -610,6 +613,7 @@ struct JanetFiber {
int32_t capacity;
int32_t maxstack; /* Arbitrary defined limit for stack overflow */
int32_t flags; /* Various flags */
jmp_buf buf; /* Handle errors */
};
/* Mark if a stack frame is a tail call for debugging */
@ -1124,6 +1128,13 @@ JANET_API int janet_type_err(JanetArgs args, int32_t n, JanetType expected);
JANET_API int janet_typemany_err(JanetArgs args, int32_t n, int expected);
JANET_API int janet_typeabstract_err(JanetArgs args, int32_t n, const JanetAbstractType *at);
/* New C API */
JANET_API void janet_panicv(Janet message);
JANET_API void janet_panic(const char *message);
JANET_API void janet_panics(const uint8_t *message);
#define janet_panicf(message, ...) janet_panics(janet_formatc(message, __VA_ARGS__))
JANET_API void janet_panic_type(Janet x, int32_t n, int expected);
/* Helpers for writing modules */
#define JANET_MODULE_ENTRY JANET_API int _janet_init