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Code Issues 1 Releases Wiki Activity

Working fiber marshaling.

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This commit is contained in:
Calvin Rose
2018-08-24 11:35:08 -04:00
parent b8a6cd84c0
commit ecdef8de8b
3 changed files with 41 additions and 21 deletions
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59
src/core/marsh.c
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@@ -103,6 +103,9 @@ static void pushbytes(MarshalState *st, const uint8_t *bytes, int32_t len) {
/* Forward declaration to enable mutual recursion. */
static void marshal_one(MarshalState *st, Dst x, int flags);
static void marshal_one_fiber(MarshalState *st, DstFiber *fiber, int flags);
static void marshal_one_def(MarshalState *st, DstFuncDef *def, int flags);
static void marshal_one_env(MarshalState *st, DstFuncEnv *env, int flags);
/* Marshal a function env */
static void marshal_one_env(MarshalState *st, DstFuncEnv *env, int flags) {
@@ -120,11 +123,11 @@ static void marshal_one_env(MarshalState *st, DstFuncEnv *env, int flags) {
pushint(st, env->length);
if (env->offset) {
/* On stack variant */
marshal_one(st, dst_wrap_fiber(env->as.fiber), flags);
marshal_one_fiber(st, env->as.fiber, flags + 1);
} else {
/* Off stack variant */
for (int32_t i = 0; i < env->length; i++)
marshal_one(st, env->as.values[i], flags);
marshal_one(st, env->as.values[i], flags + 1);
}
}
@@ -485,12 +488,27 @@ static int32_t readint(UnmarshalState *st, const uint8_t **atdata) {
return ret;
}
/* Forward declaration */
/* Forward declarations for mutual recursion */
static const uint8_t *unmarshal_one(
UnmarshalState *st,
const uint8_t *data,
Dst *out,
int flags);
static const uint8_t *unmarshal_one_env(
UnmarshalState *st,
const uint8_t *data,
DstFuncEnv **out,
int flags);
static const uint8_t *unmarshal_one_def(
UnmarshalState *st,
const uint8_t *data,
DstFuncDef **out,
int flags);
static const uint8_t *unmarshal_one_fiber(
UnmarshalState *st,
const uint8_t *data,
DstFiber **out,
int flags);
/* Unmarshal a funcenv */
static const uint8_t *unmarshal_one_env(
@@ -515,10 +533,7 @@ static const uint8_t *unmarshal_one_env(
int32_t length = readint(st, &data);
if (offset) {
/* On stack variant */
Dst fiberv;
data = unmarshal_one(st, data, &fiberv, flags);
if (!dst_checktype(fiberv, DST_FIBER)) longjmp(st->err, UMR_EXPECTED_FIBER);
env->as.fiber = dst_unwrap_fiber(fiberv);
data = unmarshal_one_fiber(st, data, &(env->as.fiber), flags);
/* Unmarshaling fiber may set values */
if (env->offset != 0 && env->offset != offset) longjmp(st->err, UMR_UNKNOWN);
if (env->length != 0 && env->length != length) longjmp(st->err, UMR_UNKNOWN);
@@ -528,7 +543,7 @@ static const uint8_t *unmarshal_one_env(
if (!env->as.values) {
DST_OUT_OF_MEMORY;
}
for (int32_t i = 0; i < env->length; i++)
for (int32_t i = 0; i < length; i++)
data = unmarshal_one(st, data, env->as.values + i, flags);
}
env->offset = offset;
@@ -707,17 +722,20 @@ static const uint8_t *unmarshal_one_fiber(
fiber->maxstack = readint(st, &data);
/* Check for bad flags and ints */
if (frame + DST_FRAME_SIZE > fiber->stackstart ||
if ((int32_t)(frame + DST_FRAME_SIZE) > fiber->stackstart ||
fiber->stackstart > fiber->stacktop ||
fiber->stacktop > fiber->capacity ||
fiber->stacktop > fiber->maxstack) {
printf("bad flags and ints.\n");
goto error;
}
/* Get root fuction */
Dst funcv;
data = dst_unmarshal_one(st, data, &funcv, flags + 1);
if (!dst_checktype(funcv, DST_FUNCTION)) goto error;
data = unmarshal_one(st, data, &funcv, flags + 1);
if (!dst_checktype(funcv, DST_FUNCTION)) {
printf("bad root func.\n");
goto error;
}
fiber->root = dst_unwrap_function(funcv);
/* Allocate stack memory */
@@ -745,8 +763,10 @@ static const uint8_t *unmarshal_one_fiber(
/* Get function */
Dst funcv;
data = unmarshal_one(st, data, &funcv, flags + 1);
if (!dst_checktype(framefunc, DST_FUNCTION))
if (!dst_checktype(funcv, DST_FUNCTION)) {
printf("bad root func.\n");
goto error;
}
func = dst_unwrap_function(funcv);
def = func->def;
@@ -763,15 +783,14 @@ static const uint8_t *unmarshal_one_fiber(
}
/* Error checking */
int32_t expected_framesize = def->arity + !!(def->flags & DST_FUNCDEF_FLAG_VARARG);
int32_t expected_framesize = def->slotcount;
if (expected_framesize != stacktop - stack) goto error;
if (pcdiff < 0 || pcdiff >= def->bytecode_length) goto error;
if (prevframe + DST_FRAME_SIZE > stack) goto error;
if ((int32_t)(prevframe + DST_FRAME_SIZE) > stack) goto error;
/* Get stack items */
for (int32_t i = stack; i < stacktop; i++) {
data = dst_unmarshal_one(st, data, fiber->data + i, flags + 1);
}
for (int32_t i = stack; i < stacktop; i++)
data = unmarshal_one(st, data, fiber->data + i, flags + 1);
/* Set frame */
framep->env = env;
@@ -787,14 +806,14 @@ static const uint8_t *unmarshal_one_fiber(
if (stack < 0) goto error;
/* Check for child fiber */
if (fiber->flags & DST_FIBER_HAS_CHILD) {
if (fiber->flags & DST_FIBER_FLAG_HASCHILD) {
fiber->flags &= ~DST_FIBER_FLAG_HASCHILD;
data = unmarshal_one_fiber(st, data, &(fiber->child), flags + 1);
}
/* Return data */
fiber->frame = frame;
*out = dst_wrap_fiber(fiber);
*out = fiber;
return data;
error: