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cosmopolitan/third_party/duktape/duk_debugger.c

2910 lines
84 KiB
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/*
* Duktape debugger
*/
#include "third_party/duktape/duk_internal.h"
#if defined(DUK_USE_DEBUGGER_SUPPORT)
/*
* Assert helpers
*/
#if defined(DUK_USE_ASSERTIONS)
#define DUK__DBG_TPORT_ENTER() do { \
DUK_ASSERT(heap->dbg_calling_transport == 0); \
heap->dbg_calling_transport = 1; \
} while (0)
#define DUK__DBG_TPORT_EXIT() do { \
DUK_ASSERT(heap->dbg_calling_transport == 1); \
heap->dbg_calling_transport = 0; \
} while (0)
#else
#define DUK__DBG_TPORT_ENTER() do {} while (0)
#define DUK__DBG_TPORT_EXIT() do {} while (0)
#endif
/*
* Helper structs
*/
typedef union {
void *p;
duk_uint_t b[1];
/* Use b[] to access the size of the union, which is strictly not
* correct. Can't use fixed size unless there's feature detection
* for pointer byte size.
*/
} duk__ptr_union;
/*
* Detach handling
*/
#define DUK__SET_CONN_BROKEN(thr,reason) do { \
/* For now shared handler is fine. */ \
duk__debug_do_detach1((thr)->heap, (reason)); \
} while (0)
DUK_LOCAL void duk__debug_do_detach1(duk_heap *heap, duk_int_t reason) {
/* Can be called multiple times with no harm. Mark the transport
* bad (dbg_read_cb == NULL) and clear state except for the detached
* callback and the udata field. The detached callback is delayed
* to the message loop so that it can be called between messages;
* this avoids corner cases related to immediate debugger reattach
* inside the detached callback.
*/
if (heap->dbg_detaching) {
DUK_D(DUK_DPRINT("debugger already detaching, ignore detach1"));
return;
}
DUK_D(DUK_DPRINT("debugger transport detaching, marking transport broken"));
heap->dbg_detaching = 1; /* prevent multiple in-progress detaches */
if (heap->dbg_write_cb != NULL) {
duk_hthread *thr;
thr = heap->heap_thread;
DUK_ASSERT(thr != NULL);
duk_debug_write_notify(thr, DUK_DBG_CMD_DETACHING);
duk_debug_write_int(thr, reason);
duk_debug_write_eom(thr);
}
heap->dbg_read_cb = NULL;
heap->dbg_write_cb = NULL;
heap->dbg_peek_cb = NULL;
heap->dbg_read_flush_cb = NULL;
heap->dbg_write_flush_cb = NULL;
heap->dbg_request_cb = NULL;
/* heap->dbg_detached_cb: keep */
/* heap->dbg_udata: keep */
/* heap->dbg_processing: keep on purpose to avoid debugger re-entry in detaching state */
heap->dbg_state_dirty = 0;
heap->dbg_force_restart = 0;
heap->dbg_pause_flags = 0;
heap->dbg_pause_act = NULL;
heap->dbg_pause_startline = 0;
heap->dbg_have_next_byte = 0;
duk_debug_clear_paused(heap); /* XXX: some overlap with field inits above */
heap->dbg_state_dirty = 0; /* XXX: clear_paused sets dirty; rework? */
/* Ensure there are no stale active breakpoint pointers.
* Breakpoint list is currently kept - we could empty it
* here but we'd need to handle refcounts correctly, and
* we'd need a 'thr' reference for that.
*
* XXX: clear breakpoint on either attach or detach?
*/
heap->dbg_breakpoints_active[0] = (duk_breakpoint *) NULL;
}
DUK_LOCAL void duk__debug_do_detach2(duk_heap *heap) {
duk_debug_detached_function detached_cb;
void *detached_udata;
duk_hthread *thr;
thr = heap->heap_thread;
if (thr == NULL) {
DUK_ASSERT(heap->dbg_detached_cb == NULL);
return;
}
/* Safe to call multiple times. */
detached_cb = heap->dbg_detached_cb;
detached_udata = heap->dbg_udata;
heap->dbg_detached_cb = NULL;
heap->dbg_udata = NULL;
if (detached_cb) {
/* Careful here: state must be wiped before the call
* so that we can cleanly handle a re-attach from
* inside the callback.
*/
DUK_D(DUK_DPRINT("detached during message loop, delayed call to detached_cb"));
detached_cb(thr, detached_udata);
}
heap->dbg_detaching = 0;
}
DUK_INTERNAL void duk_debug_do_detach(duk_heap *heap) {
duk__debug_do_detach1(heap, 0);
duk__debug_do_detach2(heap);
}
/* Called on a read/write error: NULL all callbacks except the detached
* callback so that we never accidentally call them after a read/write
* error has been indicated. This is especially important for the transport
* I/O callbacks to fulfill guaranteed callback semantics.
*/
DUK_LOCAL void duk__debug_null_most_callbacks(duk_hthread *thr) {
duk_heap *heap;
DUK_ASSERT(thr != NULL);
heap = thr->heap;
DUK_D(DUK_DPRINT("transport read/write error, NULL all callbacks expected detached"));
heap->dbg_read_cb = NULL;
heap->dbg_write_cb = NULL; /* this is especially critical to avoid another write call in detach1() */
heap->dbg_peek_cb = NULL;
heap->dbg_read_flush_cb = NULL;
heap->dbg_write_flush_cb = NULL;
heap->dbg_request_cb = NULL;
/* keep heap->dbg_detached_cb */
}
/*
* Pause handling
*/
DUK_LOCAL void duk__debug_set_pause_state(duk_hthread *thr, duk_heap *heap, duk_small_uint_t pause_flags) {
duk_uint_fast32_t line;
line = duk_debug_curr_line(thr);
if (line == 0) {
/* No line info for current function. */
duk_small_uint_t updated_flags;
updated_flags = pause_flags & ~(DUK_PAUSE_FLAG_LINE_CHANGE);
DUK_D(DUK_DPRINT("no line info for current activation, disable line-based pause flags: 0x%08lx -> 0x%08lx",
(long) pause_flags, (long) updated_flags));
pause_flags = updated_flags;
}
heap->dbg_pause_flags = pause_flags;
heap->dbg_pause_act = thr->callstack_curr;
heap->dbg_pause_startline = (duk_uint32_t) line;
heap->dbg_state_dirty = 1;
DUK_D(DUK_DPRINT("set state for automatic pause triggers, flags=0x%08lx, act=%p, startline=%ld",
(long) heap->dbg_pause_flags, (void *) heap->dbg_pause_act,
(long) heap->dbg_pause_startline));
}
/*
* Debug connection peek and flush primitives
*/
DUK_INTERNAL duk_bool_t duk_debug_read_peek(duk_hthread *thr) {
duk_heap *heap;
duk_bool_t ret;
DUK_ASSERT(thr != NULL);
heap = thr->heap;
DUK_ASSERT(heap != NULL);
if (heap->dbg_read_cb == NULL) {
DUK_D(DUK_DPRINT("attempt to peek in detached state, return zero (= no data)"));
return 0;
}
if (heap->dbg_peek_cb == NULL) {
DUK_DD(DUK_DDPRINT("no peek callback, return zero (= no data)"));
return 0;
}
DUK__DBG_TPORT_ENTER();
ret = (duk_bool_t) (heap->dbg_peek_cb(heap->dbg_udata) > 0);
DUK__DBG_TPORT_EXIT();
return ret;
}
DUK_INTERNAL void duk_debug_read_flush(duk_hthread *thr) {
duk_heap *heap;
DUK_ASSERT(thr != NULL);
heap = thr->heap;
DUK_ASSERT(heap != NULL);
if (heap->dbg_read_cb == NULL) {
DUK_D(DUK_DPRINT("attempt to read flush in detached state, ignore"));
return;
}
if (heap->dbg_read_flush_cb == NULL) {
DUK_DD(DUK_DDPRINT("no read flush callback, ignore"));
return;
}
DUK__DBG_TPORT_ENTER();
heap->dbg_read_flush_cb(heap->dbg_udata);
DUK__DBG_TPORT_EXIT();
}
DUK_INTERNAL void duk_debug_write_flush(duk_hthread *thr) {
duk_heap *heap;
DUK_ASSERT(thr != NULL);
heap = thr->heap;
DUK_ASSERT(heap != NULL);
if (heap->dbg_read_cb == NULL) {
DUK_D(DUK_DPRINT("attempt to write flush in detached state, ignore"));
return;
}
if (heap->dbg_write_flush_cb == NULL) {
DUK_DD(DUK_DDPRINT("no write flush callback, ignore"));
return;
}
DUK__DBG_TPORT_ENTER();
heap->dbg_write_flush_cb(heap->dbg_udata);
DUK__DBG_TPORT_EXIT();
}
/*
* Debug connection skip primitives
*/
/* Skip fully. */
DUK_INTERNAL void duk_debug_skip_bytes(duk_hthread *thr, duk_size_t length) {
duk_uint8_t dummy[64];
duk_size_t now;
DUK_ASSERT(thr != NULL);
while (length > 0) {
now = (length > sizeof(dummy) ? sizeof(dummy) : length);
duk_debug_read_bytes(thr, dummy, now);
length -= now;
}
}
DUK_INTERNAL void duk_debug_skip_byte(duk_hthread *thr) {
DUK_ASSERT(thr != NULL);
(void) duk_debug_read_byte(thr);
}
/*
* Debug connection read primitives
*/
/* Peek ahead in the stream one byte. */
DUK_INTERNAL uint8_t duk_debug_peek_byte(duk_hthread *thr) {
/* It is important not to call this if the last byte read was an EOM.
* Reading ahead in this scenario would cause unnecessary blocking if
* another message is not available.
*/
duk_uint8_t x;
x = duk_debug_read_byte(thr);
thr->heap->dbg_have_next_byte = 1;
thr->heap->dbg_next_byte = x;
return x;
}
/* Read fully. */
DUK_INTERNAL void duk_debug_read_bytes(duk_hthread *thr, duk_uint8_t *data, duk_size_t length) {
duk_heap *heap;
duk_uint8_t *p;
duk_size_t left;
duk_size_t got;
DUK_ASSERT(thr != NULL);
heap = thr->heap;
DUK_ASSERT(heap != NULL);
DUK_ASSERT(data != NULL);
if (heap->dbg_read_cb == NULL) {
DUK_D(DUK_DPRINT("attempt to read %ld bytes in detached state, return zero data", (long) length));
goto fail;
}
/* NOTE: length may be zero */
p = data;
if (length >= 1 && heap->dbg_have_next_byte) {
heap->dbg_have_next_byte = 0;
*p++ = heap->dbg_next_byte;
}
for (;;) {
left = (duk_size_t) ((data + length) - p);
if (left == 0) {
break;
}
DUK_ASSERT(heap->dbg_read_cb != NULL);
DUK_ASSERT(left >= 1);
#if defined(DUK_USE_DEBUGGER_TRANSPORT_TORTURE)
left = 1;
#endif
DUK__DBG_TPORT_ENTER();
got = heap->dbg_read_cb(heap->dbg_udata, (char *) p, left);
DUK__DBG_TPORT_EXIT();
if (got == 0 || got > left) {
DUK_D(DUK_DPRINT("connection error during read, return zero data"));
duk__debug_null_most_callbacks(thr); /* avoid calling write callback in detach1() */
DUK__SET_CONN_BROKEN(thr, 1);
goto fail;
}
p += got;
}
return;
fail:
duk_memzero((void *) data, (size_t) length);
}
DUK_INTERNAL duk_uint8_t duk_debug_read_byte(duk_hthread *thr) {
duk_uint8_t x;
x = 0; /* just in case callback is broken and won't write 'x' */
duk_debug_read_bytes(thr, &x, 1);
return x;
}
DUK_LOCAL duk_uint32_t duk__debug_read_uint32_raw(duk_hthread *thr) {
duk_uint8_t buf[4];
DUK_ASSERT(thr != NULL);
duk_debug_read_bytes(thr, buf, 4);
return ((duk_uint32_t) buf[0] << 24) |
((duk_uint32_t) buf[1] << 16) |
((duk_uint32_t) buf[2] << 8) |
(duk_uint32_t) buf[3];
}
DUK_LOCAL duk_int32_t duk__debug_read_int32_raw(duk_hthread *thr) {
return (duk_int32_t) duk__debug_read_uint32_raw(thr);
}
DUK_LOCAL duk_uint16_t duk__debug_read_uint16_raw(duk_hthread *thr) {
duk_uint8_t buf[2];
DUK_ASSERT(thr != NULL);
duk_debug_read_bytes(thr, buf, 2);
return ((duk_uint16_t) buf[0] << 8) |
(duk_uint16_t) buf[1];
}
DUK_INTERNAL duk_int32_t duk_debug_read_int(duk_hthread *thr) {
duk_small_uint_t x;
duk_small_uint_t t;
DUK_ASSERT(thr != NULL);
x = duk_debug_read_byte(thr);
if (x >= 0xc0) {
t = duk_debug_read_byte(thr);
return (duk_int32_t) (((x - 0xc0) << 8) + t);
} else if (x >= 0x80) {
return (duk_int32_t) (x - 0x80);
} else if (x == DUK_DBG_IB_INT4) {
return (duk_int32_t) duk__debug_read_uint32_raw(thr);
}
DUK_D(DUK_DPRINT("debug connection error: failed to decode int"));
DUK__SET_CONN_BROKEN(thr, 1);
return 0;
}
DUK_LOCAL duk_hstring *duk__debug_read_hstring_raw(duk_hthread *thr, duk_uint32_t len) {
duk_uint8_t buf[31];
duk_uint8_t *p;
if (len <= sizeof(buf)) {
duk_debug_read_bytes(thr, buf, (duk_size_t) len);
duk_push_lstring(thr, (const char *) buf, (duk_size_t) len);
} else {
p = (duk_uint8_t *) duk_push_fixed_buffer(thr, (duk_size_t) len); /* zero for paranoia */
DUK_ASSERT(p != NULL);
duk_debug_read_bytes(thr, p, (duk_size_t) len);
(void) duk_buffer_to_string(thr, -1); /* Safety relies on debug client, which is OK. */
}
return duk_require_hstring(thr, -1);
}
DUK_INTERNAL duk_hstring *duk_debug_read_hstring(duk_hthread *thr) {
duk_small_uint_t x;
duk_uint32_t len;
DUK_ASSERT(thr != NULL);
x = duk_debug_read_byte(thr);
if (x >= 0x60 && x <= 0x7f) {
/* For short strings, use a fixed temp buffer. */
len = (duk_uint32_t) (x - 0x60);
} else if (x == DUK_DBG_IB_STR2) {
len = (duk_uint32_t) duk__debug_read_uint16_raw(thr);
} else if (x == DUK_DBG_IB_STR4) {
len = (duk_uint32_t) duk__debug_read_uint32_raw(thr);
} else {
goto fail;
}
return duk__debug_read_hstring_raw(thr, len);
fail:
DUK_D(DUK_DPRINT("debug connection error: failed to decode int"));
DUK__SET_CONN_BROKEN(thr, 1);
duk_push_hstring_empty(thr); /* always push some string */
return duk_require_hstring(thr, -1);
}
DUK_LOCAL duk_hbuffer *duk__debug_read_hbuffer_raw(duk_hthread *thr, duk_uint32_t len) {
duk_uint8_t *p;
p = (duk_uint8_t *) duk_push_fixed_buffer(thr, (duk_size_t) len); /* zero for paranoia */
DUK_ASSERT(p != NULL);
duk_debug_read_bytes(thr, p, (duk_size_t) len);
return duk_require_hbuffer(thr, -1);
}
DUK_LOCAL void *duk__debug_read_pointer_raw(duk_hthread *thr) {
duk_small_uint_t x;
duk__ptr_union pu;
DUK_ASSERT(thr != NULL);
x = duk_debug_read_byte(thr);
if (x != sizeof(pu)) {
goto fail;
}
duk_debug_read_bytes(thr, (duk_uint8_t *) &pu.p, sizeof(pu));
#if defined(DUK_USE_INTEGER_LE)
duk_byteswap_bytes((duk_uint8_t *) pu.b, sizeof(pu));
#endif
return (void *) pu.p;
fail:
DUK_D(DUK_DPRINT("debug connection error: failed to decode pointer"));
DUK__SET_CONN_BROKEN(thr, 1);
return (void *) NULL;
}
DUK_LOCAL duk_double_t duk__debug_read_double_raw(duk_hthread *thr) {
duk_double_union du;
DUK_ASSERT(sizeof(du.uc) == 8);
duk_debug_read_bytes(thr, (duk_uint8_t *) du.uc, sizeof(du.uc));
DUK_DBLUNION_DOUBLE_NTOH(&du);
return du.d;
}
#if 0
DUK_INTERNAL duk_heaphdr *duk_debug_read_heapptr(duk_hthread *thr) {
duk_small_uint_t x;
DUK_ASSERT(thr != NULL);
x = duk_debug_read_byte(thr);
if (x != DUK_DBG_IB_HEAPPTR) {
goto fail;
}
return (duk_heaphdr *) duk__debug_read_pointer_raw(thr);
fail:
DUK_D(DUK_DPRINT("debug connection error: failed to decode heapptr"));
DUK__SET_CONN_BROKEN(thr, 1);
return NULL;
}
#endif
DUK_INTERNAL duk_heaphdr *duk_debug_read_any_ptr(duk_hthread *thr) {
duk_small_uint_t x;
DUK_ASSERT(thr != NULL);
x = duk_debug_read_byte(thr);
switch (x) {
case DUK_DBG_IB_OBJECT:
case DUK_DBG_IB_POINTER:
case DUK_DBG_IB_HEAPPTR:
/* Accept any pointer-like value; for 'object' dvalue, read
* and ignore the class number.
*/
if (x == DUK_DBG_IB_OBJECT) {
duk_debug_skip_byte(thr);
}
break;
default:
goto fail;
}
return (duk_heaphdr *) duk__debug_read_pointer_raw(thr);
fail:
DUK_D(DUK_DPRINT("debug connection error: failed to decode any pointer (object, pointer, heapptr)"));
DUK__SET_CONN_BROKEN(thr, 1);
return NULL;
}
DUK_INTERNAL duk_tval *duk_debug_read_tval(duk_hthread *thr) {
duk_uint8_t x;
duk_uint_t t;
duk_uint32_t len;
DUK_ASSERT(thr != NULL);
x = duk_debug_read_byte(thr);
if (x >= 0xc0) {
t = (duk_uint_t) (x - 0xc0);
t = (t << 8) + duk_debug_read_byte(thr);
duk_push_uint(thr, (duk_uint_t) t);
goto return_ptr;
}
if (x >= 0x80) {
duk_push_uint(thr, (duk_uint_t) (x - 0x80));
goto return_ptr;
}
if (x >= 0x60) {
len = (duk_uint32_t) (x - 0x60);
duk__debug_read_hstring_raw(thr, len);
goto return_ptr;
}
switch (x) {
case DUK_DBG_IB_INT4: {
duk_int32_t i = duk__debug_read_int32_raw(thr);
duk_push_i32(thr, i);
break;
}
case DUK_DBG_IB_STR4: {
len = duk__debug_read_uint32_raw(thr);
duk__debug_read_hstring_raw(thr, len);
break;
}
case DUK_DBG_IB_STR2: {
len = duk__debug_read_uint16_raw(thr);
duk__debug_read_hstring_raw(thr, len);
break;
}
case DUK_DBG_IB_BUF4: {
len = duk__debug_read_uint32_raw(thr);
duk__debug_read_hbuffer_raw(thr, len);
break;
}
case DUK_DBG_IB_BUF2: {
len = duk__debug_read_uint16_raw(thr);
duk__debug_read_hbuffer_raw(thr, len);
break;
}
case DUK_DBG_IB_UNDEFINED: {
duk_push_undefined(thr);
break;
}
case DUK_DBG_IB_NULL: {
duk_push_null(thr);
break;
}
case DUK_DBG_IB_TRUE: {
duk_push_true(thr);
break;
}
case DUK_DBG_IB_FALSE: {
duk_push_false(thr);
break;
}
case DUK_DBG_IB_NUMBER: {
duk_double_t d;
d = duk__debug_read_double_raw(thr);
duk_push_number(thr, d);
break;
}
case DUK_DBG_IB_OBJECT: {
duk_heaphdr *h;
duk_debug_skip_byte(thr);
h = (duk_heaphdr *) duk__debug_read_pointer_raw(thr);
duk_push_heapptr(thr, (void *) h);
break;
}
case DUK_DBG_IB_POINTER: {
void *ptr;
ptr = duk__debug_read_pointer_raw(thr);
duk_push_pointer(thr, ptr);
break;
}
case DUK_DBG_IB_LIGHTFUNC: {
/* XXX: Not needed for now, so not implemented. Note that
* function pointers may have different size/layout than
* a void pointer.
*/
DUK_D(DUK_DPRINT("reading lightfunc values unimplemented"));
goto fail;
}
case DUK_DBG_IB_HEAPPTR: {
duk_heaphdr *h;
h = (duk_heaphdr *) duk__debug_read_pointer_raw(thr);
duk_push_heapptr(thr, (void *) h);
break;
}
case DUK_DBG_IB_UNUSED: /* unused: not accepted in inbound messages */
default:
goto fail;
}
return_ptr:
return DUK_GET_TVAL_NEGIDX(thr, -1);
fail:
DUK_D(DUK_DPRINT("debug connection error: failed to decode tval"));
DUK__SET_CONN_BROKEN(thr, 1);
return NULL;
}
/*
* Debug connection write primitives
*/
/* Write fully. */
DUK_INTERNAL void duk_debug_write_bytes(duk_hthread *thr, const duk_uint8_t *data, duk_size_t length) {
duk_heap *heap;
const duk_uint8_t *p;
duk_size_t left;
duk_size_t got;
DUK_ASSERT(thr != NULL);
DUK_ASSERT(length == 0 || data != NULL);
heap = thr->heap;
DUK_ASSERT(heap != NULL);
if (heap->dbg_write_cb == NULL) {
DUK_D(DUK_DPRINT("attempt to write %ld bytes in detached state, ignore", (long) length));
return;
}
if (length == 0) {
/* Avoid doing an actual write callback with length == 0,
* because that's reserved for a write flush.
*/
return;
}
DUK_ASSERT(data != NULL);
p = data;
for (;;) {
left = (duk_size_t) ((data + length) - p);
if (left == 0) {
break;
}
DUK_ASSERT(heap->dbg_write_cb != NULL);
DUK_ASSERT(left >= 1);
#if defined(DUK_USE_DEBUGGER_TRANSPORT_TORTURE)
left = 1;
#endif
DUK__DBG_TPORT_ENTER();
got = heap->dbg_write_cb(heap->dbg_udata, (const char *) p, left);
DUK__DBG_TPORT_EXIT();
if (got == 0 || got > left) {
duk__debug_null_most_callbacks(thr); /* avoid calling write callback in detach1() */
DUK_D(DUK_DPRINT("connection error during write"));
DUK__SET_CONN_BROKEN(thr, 1);
return;
}
p += got;
}
}
DUK_INTERNAL void duk_debug_write_byte(duk_hthread *thr, duk_uint8_t x) {
duk_debug_write_bytes(thr, (const duk_uint8_t *) &x, 1);
}
DUK_INTERNAL void duk_debug_write_unused(duk_hthread *thr) {
duk_debug_write_byte(thr, DUK_DBG_IB_UNUSED);
}
DUK_INTERNAL void duk_debug_write_undefined(duk_hthread *thr) {
duk_debug_write_byte(thr, DUK_DBG_IB_UNDEFINED);
}
#if defined(DUK_USE_DEBUGGER_INSPECT)
DUK_INTERNAL void duk_debug_write_null(duk_hthread *thr) {
duk_debug_write_byte(thr, DUK_DBG_IB_NULL);
}
#endif
DUK_INTERNAL void duk_debug_write_boolean(duk_hthread *thr, duk_uint_t val) {
duk_debug_write_byte(thr, val ? DUK_DBG_IB_TRUE : DUK_DBG_IB_FALSE);
}
/* Write signed 32-bit integer. */
DUK_INTERNAL void duk_debug_write_int(duk_hthread *thr, duk_int32_t x) {
duk_uint8_t buf[5];
duk_size_t len;
DUK_ASSERT(thr != NULL);
if (x >= 0 && x <= 0x3fL) {
buf[0] = (duk_uint8_t) (0x80 + x);
len = 1;
} else if (x >= 0 && x <= 0x3fffL) {
buf[0] = (duk_uint8_t) (0xc0 + (x >> 8));
buf[1] = (duk_uint8_t) (x & 0xff);
len = 2;
} else {
/* Signed integers always map to 4 bytes now. */
buf[0] = (duk_uint8_t) DUK_DBG_IB_INT4;
buf[1] = (duk_uint8_t) ((x >> 24) & 0xff);
buf[2] = (duk_uint8_t) ((x >> 16) & 0xff);
buf[3] = (duk_uint8_t) ((x >> 8) & 0xff);
buf[4] = (duk_uint8_t) (x & 0xff);
len = 5;
}
duk_debug_write_bytes(thr, buf, len);
}
/* Write unsigned 32-bit integer. */
DUK_INTERNAL void duk_debug_write_uint(duk_hthread *thr, duk_uint32_t x) {
/* The debugger protocol doesn't support a plain integer encoding for
* the full 32-bit unsigned range (only 32-bit signed). For now,
* unsigned 32-bit values simply written as signed ones. This is not
* a concrete issue except for 32-bit heaphdr fields. Proper solutions
* would be to (a) write such integers as IEEE doubles or (b) add an
* unsigned 32-bit dvalue.
*/
if (x >= 0x80000000UL) {
DUK_D(DUK_DPRINT("writing unsigned integer 0x%08lx as signed integer",
(long) x));
}
duk_debug_write_int(thr, (duk_int32_t) x);
}
DUK_INTERNAL void duk_debug_write_strbuf(duk_hthread *thr, const char *data, duk_size_t length, duk_uint8_t marker_base) {
duk_uint8_t buf[5];
duk_size_t buflen;
DUK_ASSERT(thr != NULL);
DUK_ASSERT(length == 0 || data != NULL);
if (length <= 0x1fUL && marker_base == DUK_DBG_IB_STR4) {
/* For strings, special form for short lengths. */
buf[0] = (duk_uint8_t) (0x60 + length);
buflen = 1;
} else if (length <= 0xffffUL) {
buf[0] = (duk_uint8_t) (marker_base + 1);
buf[1] = (duk_uint8_t) (length >> 8);
buf[2] = (duk_uint8_t) (length & 0xff);
buflen = 3;
} else {
buf[0] = (duk_uint8_t) marker_base;
buf[1] = (duk_uint8_t) (length >> 24);
buf[2] = (duk_uint8_t) ((length >> 16) & 0xff);
buf[3] = (duk_uint8_t) ((length >> 8) & 0xff);
buf[4] = (duk_uint8_t) (length & 0xff);
buflen = 5;
}
duk_debug_write_bytes(thr, (const duk_uint8_t *) buf, buflen);
duk_debug_write_bytes(thr, (const duk_uint8_t *) data, length);
}
DUK_INTERNAL void duk_debug_write_string(duk_hthread *thr, const char *data, duk_size_t length) {
duk_debug_write_strbuf(thr, data, length, DUK_DBG_IB_STR4);
}
DUK_INTERNAL void duk_debug_write_cstring(duk_hthread *thr, const char *data) {
DUK_ASSERT(thr != NULL);
duk_debug_write_string(thr,
data,
data ? DUK_STRLEN(data) : 0);
}
DUK_INTERNAL void duk_debug_write_hstring(duk_hthread *thr, duk_hstring *h) {
DUK_ASSERT(thr != NULL);
/* XXX: differentiate null pointer from empty string? */
duk_debug_write_string(thr,
(h != NULL ? (const char *) DUK_HSTRING_GET_DATA(h) : NULL),
(h != NULL ? (duk_size_t) DUK_HSTRING_GET_BYTELEN(h) : 0));
}
DUK_LOCAL void duk__debug_write_hstring_safe_top(duk_hthread *thr) {
duk_debug_write_hstring(thr, duk_safe_to_hstring(thr, -1));
}
DUK_INTERNAL void duk_debug_write_buffer(duk_hthread *thr, const char *data, duk_size_t length) {
duk_debug_write_strbuf(thr, data, length, DUK_DBG_IB_BUF4);
}
DUK_INTERNAL void duk_debug_write_hbuffer(duk_hthread *thr, duk_hbuffer *h) {
DUK_ASSERT(thr != NULL);
duk_debug_write_buffer(thr,
(h != NULL ? (const char *) DUK_HBUFFER_GET_DATA_PTR(thr->heap, h) : NULL),
(h != NULL ? (duk_size_t) DUK_HBUFFER_GET_SIZE(h) : 0));
}
DUK_LOCAL void duk__debug_write_pointer_raw(duk_hthread *thr, void *ptr, duk_uint8_t ibyte) {
duk_uint8_t buf[2];
duk__ptr_union pu;
DUK_ASSERT(thr != NULL);
DUK_ASSERT(sizeof(ptr) >= 1 && sizeof(ptr) <= 16);
/* ptr may be NULL */
buf[0] = ibyte;
buf[1] = sizeof(pu);
duk_debug_write_bytes(thr, buf, 2);
pu.p = (void *) ptr;
#if defined(DUK_USE_INTEGER_LE)
duk_byteswap_bytes((duk_uint8_t *) pu.b, sizeof(pu));
#endif
duk_debug_write_bytes(thr, (const duk_uint8_t *) &pu.p, (duk_size_t) sizeof(pu));
}
DUK_INTERNAL void duk_debug_write_pointer(duk_hthread *thr, void *ptr) {
duk__debug_write_pointer_raw(thr, ptr, DUK_DBG_IB_POINTER);
}
#if defined(DUK_USE_DEBUGGER_DUMPHEAP) || defined(DUK_USE_DEBUGGER_INSPECT)
DUK_INTERNAL void duk_debug_write_heapptr(duk_hthread *thr, duk_heaphdr *h) {
duk__debug_write_pointer_raw(thr, (void *) h, DUK_DBG_IB_HEAPPTR);
}
#endif /* DUK_USE_DEBUGGER_DUMPHEAP || DUK_USE_DEBUGGER_INSPECT */
DUK_INTERNAL void duk_debug_write_hobject(duk_hthread *thr, duk_hobject *obj) {
duk_uint8_t buf[3];
duk__ptr_union pu;
DUK_ASSERT(thr != NULL);
DUK_ASSERT(sizeof(obj) >= 1 && sizeof(obj) <= 16);
DUK_ASSERT(obj != NULL);
buf[0] = DUK_DBG_IB_OBJECT;
buf[1] = (duk_uint8_t) DUK_HOBJECT_GET_CLASS_NUMBER(obj);
buf[2] = sizeof(pu);
duk_debug_write_bytes(thr, buf, 3);
pu.p = (void *) obj;
#if defined(DUK_USE_INTEGER_LE)
duk_byteswap_bytes((duk_uint8_t *) pu.b, sizeof(pu));
#endif
duk_debug_write_bytes(thr, (const duk_uint8_t *) &pu.p, (duk_size_t) sizeof(pu));
}
DUK_INTERNAL void duk_debug_write_tval(duk_hthread *thr, duk_tval *tv) {
duk_c_function lf_func;
duk_small_uint_t lf_flags;
duk_uint8_t buf[4];
duk_double_union du1;
duk_double_union du2;
duk_int32_t i32;
DUK_ASSERT(thr != NULL);
DUK_ASSERT(tv != NULL);
switch (DUK_TVAL_GET_TAG(tv)) {
case DUK_TAG_UNDEFINED:
duk_debug_write_byte(thr, DUK_DBG_IB_UNDEFINED);
break;
case DUK_TAG_UNUSED:
duk_debug_write_byte(thr, DUK_DBG_IB_UNUSED);
break;
case DUK_TAG_NULL:
duk_debug_write_byte(thr, DUK_DBG_IB_NULL);
break;
case DUK_TAG_BOOLEAN:
DUK_ASSERT(DUK_TVAL_GET_BOOLEAN(tv) == 0 ||
DUK_TVAL_GET_BOOLEAN(tv) == 1);
duk_debug_write_boolean(thr, DUK_TVAL_GET_BOOLEAN(tv));
break;
case DUK_TAG_POINTER:
duk_debug_write_pointer(thr, (void *) DUK_TVAL_GET_POINTER(tv));
break;
case DUK_TAG_LIGHTFUNC:
DUK_TVAL_GET_LIGHTFUNC(tv, lf_func, lf_flags);
buf[0] = DUK_DBG_IB_LIGHTFUNC;
buf[1] = (duk_uint8_t) (lf_flags >> 8);
buf[2] = (duk_uint8_t) (lf_flags & 0xff);
buf[3] = sizeof(lf_func);
duk_debug_write_bytes(thr, buf, 4);
duk_debug_write_bytes(thr, (const duk_uint8_t *) &lf_func, sizeof(lf_func));
break;
case DUK_TAG_STRING:
duk_debug_write_hstring(thr, DUK_TVAL_GET_STRING(tv));
break;
case DUK_TAG_OBJECT:
duk_debug_write_hobject(thr, DUK_TVAL_GET_OBJECT(tv));
break;
case DUK_TAG_BUFFER:
duk_debug_write_hbuffer(thr, DUK_TVAL_GET_BUFFER(tv));
break;
#if defined(DUK_USE_FASTINT)
case DUK_TAG_FASTINT:
#endif
default:
/* Numbers are normalized to big (network) endian. We can
* (but are not required) to use integer dvalues when there's
* no loss of precision.
*
* XXX: share check with other code; this check is slow but
* reliable and doesn't require careful exponent/mantissa
* mask tricks as in the fastint downgrade code.
*/
DUK_ASSERT(!DUK_TVAL_IS_UNUSED(tv));
DUK_ASSERT(DUK_TVAL_IS_NUMBER(tv));
du1.d = DUK_TVAL_GET_NUMBER(tv);
i32 = (duk_int32_t) du1.d;
du2.d = (duk_double_t) i32;
DUK_DD(DUK_DDPRINT("i32=%ld du1=%02x%02x%02x%02x%02x%02x%02x%02x "
"du2=%02x%02x%02x%02x%02x%02x%02x%02x",
(long) i32,
(unsigned int) du1.uc[0], (unsigned int) du1.uc[1],
(unsigned int) du1.uc[2], (unsigned int) du1.uc[3],
(unsigned int) du1.uc[4], (unsigned int) du1.uc[5],
(unsigned int) du1.uc[6], (unsigned int) du1.uc[7],
(unsigned int) du2.uc[0], (unsigned int) du2.uc[1],
(unsigned int) du2.uc[2], (unsigned int) du2.uc[3],
(unsigned int) du2.uc[4], (unsigned int) du2.uc[5],
(unsigned int) du2.uc[6], (unsigned int) du2.uc[7]));
if (duk_memcmp((const void *) du1.uc, (const void *) du2.uc, sizeof(du1.uc)) == 0) {
duk_debug_write_int(thr, i32);
} else {
DUK_DBLUNION_DOUBLE_HTON(&du1);
duk_debug_write_byte(thr, DUK_DBG_IB_NUMBER);
duk_debug_write_bytes(thr, (const duk_uint8_t *) du1.uc, sizeof(du1.uc));
}
}
}
#if defined(DUK_USE_DEBUGGER_DUMPHEAP)
/* Variant for writing duk_tvals so that any heap allocated values are
* written out as tagged heap pointers.
*/
DUK_LOCAL void duk__debug_write_tval_heapptr(duk_hthread *thr, duk_tval *tv) {
if (DUK_TVAL_IS_HEAP_ALLOCATED(tv)) {
duk_heaphdr *h = DUK_TVAL_GET_HEAPHDR(tv);
duk_debug_write_heapptr(thr, h);
} else {
duk_debug_write_tval(thr, tv);
}
}
#endif /* DUK_USE_DEBUGGER_DUMPHEAP */
/*
* Debug connection message write helpers
*/
#if 0 /* unused */
DUK_INTERNAL void duk_debug_write_request(duk_hthread *thr, duk_small_uint_t command) {
duk_debug_write_byte(thr, DUK_DBG_IB_REQUEST);
duk_debug_write_int(thr, command);
}
#endif
DUK_INTERNAL void duk_debug_write_reply(duk_hthread *thr) {
duk_debug_write_byte(thr, DUK_DBG_IB_REPLY);
}
DUK_INTERNAL void duk_debug_write_error_eom(duk_hthread *thr, duk_small_uint_t err_code, const char *msg) {
/* Allow NULL 'msg' */
duk_debug_write_byte(thr, DUK_DBG_IB_ERROR);
duk_debug_write_int(thr, (duk_int32_t) err_code);
duk_debug_write_cstring(thr, msg);
duk_debug_write_eom(thr);
}
DUK_INTERNAL void duk_debug_write_notify(duk_hthread *thr, duk_small_uint_t command) {
duk_debug_write_byte(thr, DUK_DBG_IB_NOTIFY);
duk_debug_write_int(thr, (duk_int32_t) command);
}
DUK_INTERNAL void duk_debug_write_eom(duk_hthread *thr) {
duk_debug_write_byte(thr, DUK_DBG_IB_EOM);
/* As an initial implementation, write flush after every EOM (and the
* version identifier). A better implementation would flush only when
* Duktape is finished processing messages so that a flush only happens
* after all outbound messages are finished on that occasion.
*/
duk_debug_write_flush(thr);
}
/*
* Status message and helpers
*/
DUK_INTERNAL duk_uint_fast32_t duk_debug_curr_line(duk_hthread *thr) {
duk_activation *act;
duk_uint_fast32_t line;
duk_uint_fast32_t pc;
act = thr->callstack_curr;
if (act == NULL) {
return 0;
}
/* We're conceptually between two opcodes; act->pc indicates the next
* instruction to be executed. This is usually the correct pc/line to
* indicate in Status. (For the 'debugger' statement this now reports
* the pc/line after the debugger statement because the debugger opcode
* has already been executed.)
*/
pc = duk_hthread_get_act_curr_pc(thr, act);
/* XXX: this should be optimized to be a raw query and avoid valstack
* operations if possible.
*/
duk_push_tval(thr, &act->tv_func);
line = duk_hobject_pc2line_query(thr, -1, pc);
duk_pop(thr);
return line;
}
DUK_INTERNAL void duk_debug_send_status(duk_hthread *thr) {
duk_activation *act;
duk_debug_write_notify(thr, DUK_DBG_CMD_STATUS);
duk_debug_write_int(thr, (DUK_HEAP_HAS_DEBUGGER_PAUSED(thr->heap) ? 1 : 0));
act = thr->callstack_curr;
if (act == NULL) {
duk_debug_write_undefined(thr);
duk_debug_write_undefined(thr);
duk_debug_write_int(thr, 0);
duk_debug_write_int(thr, 0);
} else {
duk_push_tval(thr, &act->tv_func);
duk_get_prop_literal(thr, -1, "fileName");
duk__debug_write_hstring_safe_top(thr);
duk_get_prop_literal(thr, -2, "name");
duk__debug_write_hstring_safe_top(thr);
duk_pop_3(thr);
/* Report next pc/line to be executed. */
duk_debug_write_uint(thr, (duk_uint32_t) duk_debug_curr_line(thr));
duk_debug_write_uint(thr, (duk_uint32_t) duk_hthread_get_act_curr_pc(thr, act));
}
duk_debug_write_eom(thr);
}
#if defined(DUK_USE_DEBUGGER_THROW_NOTIFY)
DUK_INTERNAL void duk_debug_send_throw(duk_hthread *thr, duk_bool_t fatal) {
/*
* NFY <int: 5> <int: fatal> <str: msg> <str: filename> <int: linenumber> EOM
*/
duk_activation *act;
duk_uint32_t pc;
DUK_ASSERT(thr->valstack_top > thr->valstack); /* At least: ... [err] */
duk_debug_write_notify(thr, DUK_DBG_CMD_THROW);
duk_debug_write_int(thr, (duk_int32_t) fatal);
/* Report thrown value to client coerced to string */
duk_dup_top(thr);
duk__debug_write_hstring_safe_top(thr);
duk_pop(thr);
if (duk_is_error(thr, -1)) {
/* Error instance, use augmented error data directly */
duk_get_prop_stridx_short(thr, -1, DUK_STRIDX_FILE_NAME);
duk__debug_write_hstring_safe_top(thr);
duk_get_prop_stridx_short(thr, -2, DUK_STRIDX_LINE_NUMBER);
duk_debug_write_uint(thr, duk_get_uint(thr, -1));
duk_pop_2(thr);
} else {
/* For anything other than an Error instance, we calculate the
* error location directly from the current activation if one
* exists.
*/
act = thr->callstack_curr;
if (act != NULL) {
duk_push_tval(thr, &act->tv_func);
duk_get_prop_literal(thr, -1, "fileName");
duk__debug_write_hstring_safe_top(thr);
pc = (duk_uint32_t) duk_hthread_get_act_prev_pc(thr, act);
duk_debug_write_uint(thr, (duk_uint32_t) duk_hobject_pc2line_query(thr, -2, pc));
duk_pop_2(thr);
} else {
/* Can happen if duk_throw() is called on an empty
* callstack.
*/
duk_debug_write_cstring(thr, "");
duk_debug_write_uint(thr, 0);
}
}
duk_debug_write_eom(thr);
}
#endif /* DUK_USE_DEBUGGER_THROW_NOTIFY */
/*
* Debug message processing
*/
/* Skip dvalue. */
DUK_LOCAL duk_bool_t duk__debug_skip_dvalue(duk_hthread *thr) {
duk_uint8_t x;
duk_uint32_t len;
x = duk_debug_read_byte(thr);
if (x >= 0xc0) {
duk_debug_skip_byte(thr);
return 0;
}
if (x >= 0x80) {
return 0;
}
if (x >= 0x60) {
duk_debug_skip_bytes(thr, (duk_size_t) (x - 0x60));
return 0;
}
switch(x) {
case DUK_DBG_IB_EOM:
return 1; /* Return 1: got EOM */
case DUK_DBG_IB_REQUEST:
case DUK_DBG_IB_REPLY:
case DUK_DBG_IB_ERROR:
case DUK_DBG_IB_NOTIFY:
break;
case DUK_DBG_IB_INT4:
(void) duk__debug_read_uint32_raw(thr);
break;
case DUK_DBG_IB_STR4:
case DUK_DBG_IB_BUF4:
len = duk__debug_read_uint32_raw(thr);
duk_debug_skip_bytes(thr, len);
break;
case DUK_DBG_IB_STR2:
case DUK_DBG_IB_BUF2:
len = duk__debug_read_uint16_raw(thr);
duk_debug_skip_bytes(thr, len);
break;
case DUK_DBG_IB_UNUSED:
case DUK_DBG_IB_UNDEFINED:
case DUK_DBG_IB_NULL:
case DUK_DBG_IB_TRUE:
case DUK_DBG_IB_FALSE:
break;
case DUK_DBG_IB_NUMBER:
duk_debug_skip_bytes(thr, 8);
break;
case DUK_DBG_IB_OBJECT:
duk_debug_skip_byte(thr);
len = duk_debug_read_byte(thr);
duk_debug_skip_bytes(thr, len);
break;
case DUK_DBG_IB_POINTER:
case DUK_DBG_IB_HEAPPTR:
len = duk_debug_read_byte(thr);
duk_debug_skip_bytes(thr, len);
break;
case DUK_DBG_IB_LIGHTFUNC:
duk_debug_skip_bytes(thr, 2);
len = duk_debug_read_byte(thr);
duk_debug_skip_bytes(thr, len);
break;
default:
goto fail;
}
return 0;
fail:
DUK__SET_CONN_BROKEN(thr, 1);
return 1; /* Pretend like we got EOM */
}
/* Skip dvalues to EOM. */
DUK_LOCAL void duk__debug_skip_to_eom(duk_hthread *thr) {
for (;;) {
if (duk__debug_skip_dvalue(thr)) {
break;
}
}
}
/* Read and validate a call stack index. If index is invalid, write out an
* error message and return zero.
*/
DUK_LOCAL duk_int32_t duk__debug_read_validate_csindex(duk_hthread *thr) {
duk_int32_t level;
level = duk_debug_read_int(thr);
if (level >= 0 || -level > (duk_int32_t) thr->callstack_top) {
duk_debug_write_error_eom(thr, DUK_DBG_ERR_NOTFOUND, "invalid callstack index");
return 0; /* zero indicates failure */
}
return level;
}
/* Read a call stack index and lookup the corresponding duk_activation.
* If index is invalid, write out an error message and return NULL.
*/
DUK_LOCAL duk_activation *duk__debug_read_level_get_activation(duk_hthread *thr) {
duk_activation *act;
duk_int32_t level;
level = duk_debug_read_int(thr);
act = duk_hthread_get_activation_for_level(thr, level);
if (act == NULL) {
duk_debug_write_error_eom(thr, DUK_DBG_ERR_NOTFOUND, "invalid callstack index");
}
return act;
}
/*
* Simple commands
*/
DUK_LOCAL void duk__debug_handle_basic_info(duk_hthread *thr, duk_heap *heap) {
DUK_UNREF(heap);
DUK_D(DUK_DPRINT("debug command Version"));
duk_debug_write_reply(thr);
duk_debug_write_int(thr, DUK_VERSION);
duk_debug_write_cstring(thr, DUK_GIT_DESCRIBE);
duk_debug_write_cstring(thr, DUK_USE_TARGET_INFO);
#if defined(DUK_USE_DOUBLE_LE)
duk_debug_write_int(thr, 1);
#elif defined(DUK_USE_DOUBLE_ME)
duk_debug_write_int(thr, 2);
#elif defined(DUK_USE_DOUBLE_BE)
duk_debug_write_int(thr, 3);
#else
duk_debug_write_int(thr, 0);
#endif
duk_debug_write_int(thr, (duk_int_t) sizeof(void *));
duk_debug_write_eom(thr);
}
DUK_LOCAL void duk__debug_handle_trigger_status(duk_hthread *thr, duk_heap *heap) {
DUK_UNREF(heap);
DUK_D(DUK_DPRINT("debug command TriggerStatus"));
duk_debug_write_reply(thr);
duk_debug_write_eom(thr);
heap->dbg_state_dirty = 1;
}
DUK_LOCAL void duk__debug_handle_pause(duk_hthread *thr, duk_heap *heap) {
DUK_D(DUK_DPRINT("debug command Pause"));
duk_debug_set_paused(heap);
duk_debug_write_reply(thr);
duk_debug_write_eom(thr);
}
DUK_LOCAL void duk__debug_handle_resume(duk_hthread *thr, duk_heap *heap) {
duk_small_uint_t pause_flags;
DUK_D(DUK_DPRINT("debug command Resume"));
duk_debug_clear_paused(heap);
pause_flags = 0;
#if 0 /* manual testing */
pause_flags |= DUK_PAUSE_FLAG_ONE_OPCODE;
pause_flags |= DUK_PAUSE_FLAG_CAUGHT_ERROR;
pause_flags |= DUK_PAUSE_FLAG_UNCAUGHT_ERROR;
#endif
#if defined(DUK_USE_DEBUGGER_PAUSE_UNCAUGHT)
pause_flags |= DUK_PAUSE_FLAG_UNCAUGHT_ERROR;
#endif
duk__debug_set_pause_state(thr, heap, pause_flags);
duk_debug_write_reply(thr);
duk_debug_write_eom(thr);
}
DUK_LOCAL void duk__debug_handle_step(duk_hthread *thr, duk_heap *heap, duk_int32_t cmd) {
duk_small_uint_t pause_flags;
DUK_D(DUK_DPRINT("debug command StepInto/StepOver/StepOut: %d", (int) cmd));
if (cmd == DUK_DBG_CMD_STEPINTO) {
pause_flags = DUK_PAUSE_FLAG_LINE_CHANGE |
DUK_PAUSE_FLAG_FUNC_ENTRY |
DUK_PAUSE_FLAG_FUNC_EXIT;
} else if (cmd == DUK_DBG_CMD_STEPOVER) {
pause_flags = DUK_PAUSE_FLAG_LINE_CHANGE |
DUK_PAUSE_FLAG_FUNC_EXIT;
} else {
DUK_ASSERT(cmd == DUK_DBG_CMD_STEPOUT);
pause_flags = DUK_PAUSE_FLAG_FUNC_EXIT;
}
#if defined(DUK_USE_DEBUGGER_PAUSE_UNCAUGHT)
pause_flags |= DUK_PAUSE_FLAG_UNCAUGHT_ERROR;
#endif
/* If current activation doesn't have line information, line-based
* pause flags are automatically disabled. As a result, e.g.
* StepInto will then pause on (native) function entry or exit.
*/
duk_debug_clear_paused(heap);
duk__debug_set_pause_state(thr, heap, pause_flags);
duk_debug_write_reply(thr);
duk_debug_write_eom(thr);
}
DUK_LOCAL void duk__debug_handle_list_break(duk_hthread *thr, duk_heap *heap) {
duk_small_int_t i;
DUK_D(DUK_DPRINT("debug command ListBreak"));
duk_debug_write_reply(thr);
for (i = 0; i < (duk_small_int_t) heap->dbg_breakpoint_count; i++) {
duk_debug_write_hstring(thr, heap->dbg_breakpoints[i].filename);
duk_debug_write_uint(thr, (duk_uint32_t) heap->dbg_breakpoints[i].line);
}
duk_debug_write_eom(thr);
}
DUK_LOCAL void duk__debug_handle_add_break(duk_hthread *thr, duk_heap *heap) {
duk_hstring *filename;
duk_uint32_t linenumber;
duk_small_int_t idx;
DUK_UNREF(heap);
filename = duk_debug_read_hstring(thr);
linenumber = (duk_uint32_t) duk_debug_read_int(thr);
DUK_D(DUK_DPRINT("debug command AddBreak: %!O:%ld", (duk_hobject *) filename, (long) linenumber));
idx = duk_debug_add_breakpoint(thr, filename, linenumber);
if (idx >= 0) {
duk_debug_write_reply(thr);
duk_debug_write_int(thr, (duk_int32_t) idx);
duk_debug_write_eom(thr);
} else {
duk_debug_write_error_eom(thr, DUK_DBG_ERR_TOOMANY, "no space for breakpoint");
}
}
DUK_LOCAL void duk__debug_handle_del_break(duk_hthread *thr, duk_heap *heap) {
duk_small_uint_t idx;
DUK_UNREF(heap);
DUK_D(DUK_DPRINT("debug command DelBreak"));
idx = (duk_small_uint_t) duk_debug_read_int(thr);
if (duk_debug_remove_breakpoint(thr, idx)) {
duk_debug_write_reply(thr);
duk_debug_write_eom(thr);
} else {
duk_debug_write_error_eom(thr, DUK_DBG_ERR_NOTFOUND, "invalid breakpoint index");
}
}
DUK_LOCAL void duk__debug_handle_get_var(duk_hthread *thr, duk_heap *heap) {
duk_activation *act;
duk_hstring *str;
duk_bool_t rc;
DUK_UNREF(heap);
DUK_D(DUK_DPRINT("debug command GetVar"));
act = duk__debug_read_level_get_activation(thr);
if (act == NULL) {
return;
}
str = duk_debug_read_hstring(thr); /* push to stack */
DUK_ASSERT(str != NULL);
rc = duk_js_getvar_activation(thr, act, str, 0);
duk_debug_write_reply(thr);
if (rc) {
duk_debug_write_int(thr, 1);
DUK_ASSERT(duk_get_tval(thr, -2) != NULL);
duk_debug_write_tval(thr, duk_get_tval(thr, -2));
} else {
duk_debug_write_int(thr, 0);
duk_debug_write_unused(thr);
}
duk_debug_write_eom(thr);
}
DUK_LOCAL void duk__debug_handle_put_var(duk_hthread *thr, duk_heap *heap) {
duk_activation *act;
duk_hstring *str;
duk_tval *tv;
DUK_UNREF(heap);
DUK_D(DUK_DPRINT("debug command PutVar"));
act = duk__debug_read_level_get_activation(thr);
if (act == NULL) {
return;
}
str = duk_debug_read_hstring(thr); /* push to stack */
DUK_ASSERT(str != NULL);
tv = duk_debug_read_tval(thr);
if (tv == NULL) {
/* detached */
return;
}
duk_js_putvar_activation(thr, act, str, tv, 0);
/* XXX: Current putvar implementation doesn't have a success flag,
* add one and send to debug client?
*/
duk_debug_write_reply(thr);
duk_debug_write_eom(thr);
}
DUK_LOCAL void duk__debug_handle_get_call_stack(duk_hthread *thr, duk_heap *heap) {
duk_hthread *curr_thr = thr;
duk_activation *curr_act;
duk_uint_fast32_t pc;
duk_uint_fast32_t line;
DUK_ASSERT(thr != NULL);
DUK_UNREF(heap);
duk_debug_write_reply(thr);
while (curr_thr != NULL) {
for (curr_act = curr_thr->callstack_curr; curr_act != NULL; curr_act = curr_act->parent) {
/* PC/line semantics here are:
* - For callstack top we're conceptually between two
* opcodes and current PC indicates next line to
* execute, so report that (matches Status).
* - For other activations we're conceptually still
* executing the instruction at PC-1, so report that
* (matches error stacktrace behavior).
* - See: https://github.com/svaarala/duktape/issues/281
*/
/* XXX: optimize to use direct reads, i.e. avoid
* value stack operations.
*/
duk_push_tval(thr, &curr_act->tv_func);
duk_get_prop_stridx_short(thr, -1, DUK_STRIDX_FILE_NAME);
duk__debug_write_hstring_safe_top(thr);
duk_get_prop_stridx_short(thr, -2, DUK_STRIDX_NAME);
duk__debug_write_hstring_safe_top(thr);
pc = duk_hthread_get_act_curr_pc(thr, curr_act);
if (curr_act != curr_thr->callstack_curr && pc > 0) {
pc--;
}
line = duk_hobject_pc2line_query(thr, -3, pc);
duk_debug_write_uint(thr, (duk_uint32_t) line);
duk_debug_write_uint(thr, (duk_uint32_t) pc);
duk_pop_3(thr);
}
curr_thr = curr_thr->resumer;
}
/* SCANBUILD: warning about 'thr' potentially being NULL here,
* warning is incorrect because thr != NULL always here.
*/
duk_debug_write_eom(thr);
}
DUK_LOCAL void duk__debug_handle_get_locals(duk_hthread *thr, duk_heap *heap) {
duk_activation *act;
duk_hstring *varname;
DUK_UNREF(heap);
act = duk__debug_read_level_get_activation(thr);
if (act == NULL) {
return;
}
duk_debug_write_reply(thr);
/* XXX: several nice-to-have improvements here:
* - Use direct reads avoiding value stack operations
* - Avoid triggering getters, indicate getter values to debug client
* - If side effects are possible, add error catching
*/
if (DUK_TVAL_IS_OBJECT(&act->tv_func)) {
duk_hobject *h_func = DUK_TVAL_GET_OBJECT(&act->tv_func);
duk_hobject *h_varmap;
h_varmap = duk_hobject_get_varmap(thr, h_func);
if (h_varmap != NULL) {
duk_push_hobject(thr, h_varmap);
duk_enum(thr, -1, 0 /*enum_flags*/);
while (duk_next(thr, -1 /*enum_index*/, 0 /*get_value*/)) {
varname = duk_known_hstring(thr, -1);
duk_js_getvar_activation(thr, act, varname, 0 /*throw_flag*/);
/* [ ... func varmap enum key value this ] */
duk_debug_write_hstring(thr, duk_get_hstring(thr, -3));
duk_debug_write_tval(thr, duk_get_tval(thr, -2));
duk_pop_3(thr); /* -> [ ... func varmap enum ] */
}
} else {
DUK_D(DUK_DPRINT("varmap missing in GetLocals, ignore"));
}
} else {
DUK_D(DUK_DPRINT("varmap is not an object in GetLocals, ignore"));
}
duk_debug_write_eom(thr);
}
DUK_LOCAL void duk__debug_handle_eval(duk_hthread *thr, duk_heap *heap) {
duk_small_uint_t call_flags;
duk_int_t call_ret;
duk_small_int_t eval_err;
duk_bool_t direct_eval;
duk_int32_t level;
duk_idx_t idx_func;
DUK_UNREF(heap);
DUK_D(DUK_DPRINT("debug command Eval"));
/* The eval code is executed within the lexical environment of a specified
* activation. For now, use global object eval() function, with the eval
* considered a 'direct call to eval'.
*
* Callstack index for debug commands only affects scope -- the callstack
* as seen by, e.g. Duktape.act() will be the same regardless.
*/
/* nargs == 2 so we can pass a callstack index to eval(). */
idx_func = duk_get_top(thr);
duk_push_c_function(thr, duk_bi_global_object_eval, 2 /*nargs*/);
duk_push_undefined(thr); /* 'this' binding shouldn't matter here */
/* Read callstack index, if non-null. */
if (duk_debug_peek_byte(thr) == DUK_DBG_IB_NULL) {
direct_eval = 0;
level = -1; /* Not needed, but silences warning. */
(void) duk_debug_read_byte(thr);
} else {
direct_eval = 1;
level = duk__debug_read_validate_csindex(thr);
if (level == 0) {
return;
}
}
DUK_ASSERT(!direct_eval ||
(level < 0 && -level <= (duk_int32_t) thr->callstack_top));
(void) duk_debug_read_hstring(thr);
if (direct_eval) {
duk_push_int(thr, level - 1); /* compensate for eval() call */
}
/* [ ... eval "eval" eval_input level? ] */
call_flags = 0;
if (direct_eval) {
duk_activation *act;
duk_hobject *fun;
act = duk_hthread_get_activation_for_level(thr, level);
if (act != NULL) {
fun = DUK_ACT_GET_FUNC(act);
if (fun != NULL && DUK_HOBJECT_IS_COMPFUNC(fun)) {
/* Direct eval requires that there's a current
* activation and it is an ECMAScript function.
* When Eval is executed from e.g. cooperate API
* call we'll need to do an indirect eval instead.
*/
call_flags |= DUK_CALL_FLAG_DIRECT_EVAL;
}
}
}
call_ret = duk_pcall_method_flags(thr, duk_get_top(thr) - (idx_func + 2), call_flags);
if (call_ret == DUK_EXEC_SUCCESS) {
eval_err = 0;
/* Use result value as is. */
} else {
/* For errors a string coerced result is most informative
* right now, as the debug client doesn't have the capability
* to traverse the error object.
*/
eval_err = 1;
duk_safe_to_string(thr, -1);
}
/* [ ... result ] */
duk_debug_write_reply(thr);
duk_debug_write_int(thr, (duk_int32_t) eval_err);
DUK_ASSERT(duk_get_tval(thr, -1) != NULL);
duk_debug_write_tval(thr, duk_get_tval(thr, -1));
duk_debug_write_eom(thr);
}
DUK_LOCAL void duk__debug_handle_detach(duk_hthread *thr, duk_heap *heap) {
DUK_UNREF(heap);
DUK_D(DUK_DPRINT("debug command Detach"));
duk_debug_write_reply(thr);
duk_debug_write_eom(thr);
DUK_D(DUK_DPRINT("debug connection detached, mark broken"));
DUK__SET_CONN_BROKEN(thr, 0); /* not an error */
}
DUK_LOCAL void duk__debug_handle_apprequest(duk_hthread *thr, duk_heap *heap) {
duk_idx_t old_top;
DUK_D(DUK_DPRINT("debug command AppRequest"));
old_top = duk_get_top(thr); /* save stack top */
if (heap->dbg_request_cb != NULL) {
duk_idx_t nrets;
duk_idx_t nvalues = 0;
duk_idx_t top, idx;
/* Read tvals from the message and push them onto the valstack,
* then call the request callback to process the request.
*/
while (duk_debug_peek_byte(thr) != DUK_DBG_IB_EOM) {
duk_tval *tv;
if (!duk_check_stack(thr, 1)) {
DUK_D(DUK_DPRINT("failed to allocate space for request dvalue(s)"));
goto fail;
}
tv = duk_debug_read_tval(thr); /* push to stack */
if (tv == NULL) {
/* detached */
return;
}
nvalues++;
}
DUK_ASSERT(duk_get_top(thr) == old_top + nvalues);
/* Request callback should push values for reply to client onto valstack */
DUK_D(DUK_DPRINT("calling into AppRequest request_cb with nvalues=%ld, old_top=%ld, top=%ld",
(long) nvalues, (long) old_top, (long) duk_get_top(thr)));
nrets = heap->dbg_request_cb(thr, heap->dbg_udata, nvalues);
DUK_D(DUK_DPRINT("returned from AppRequest request_cb; nvalues=%ld -> nrets=%ld, old_top=%ld, top=%ld",
(long) nvalues, (long) nrets, (long) old_top, (long) duk_get_top(thr)));
if (nrets >= 0) {
DUK_ASSERT(duk_get_top(thr) >= old_top + nrets);
if (duk_get_top(thr) < old_top + nrets) {
DUK_D(DUK_DPRINT("AppRequest callback doesn't match value stack configuration, "
"top=%ld < old_top=%ld + nrets=%ld; "
"this might mean it's unsafe to continue!",
(long) duk_get_top(thr), (long) old_top, (long) nrets));
goto fail;
}
/* Reply with tvals pushed by request callback */
duk_debug_write_byte(thr, DUK_DBG_IB_REPLY);
top = duk_get_top(thr);
for (idx = top - nrets; idx < top; idx++) {
duk_debug_write_tval(thr, DUK_GET_TVAL_POSIDX(thr, idx));
}
duk_debug_write_eom(thr);
} else {
DUK_ASSERT(duk_get_top(thr) >= old_top + 1);
if (duk_get_top(thr) < old_top + 1) {
DUK_D(DUK_DPRINT("request callback return value doesn't match value stack configuration"));
goto fail;
}
duk_debug_write_error_eom(thr, DUK_DBG_ERR_APPLICATION, duk_get_string(thr, -1));
}
duk_set_top(thr, old_top); /* restore stack top */
} else {
DUK_D(DUK_DPRINT("no request callback, treat AppRequest as unsupported"));
duk_debug_write_error_eom(thr, DUK_DBG_ERR_UNSUPPORTED, "AppRequest unsupported by target");
}
return;
fail:
duk_set_top(thr, old_top); /* restore stack top */
DUK__SET_CONN_BROKEN(thr, 1);
}
/*
* DumpHeap command
*/
#if defined(DUK_USE_DEBUGGER_DUMPHEAP)
/* XXX: this has some overlap with object inspection; remove this and make
* DumpHeap return lists of heapptrs instead?
*/
DUK_LOCAL void duk__debug_dump_heaphdr(duk_hthread *thr, duk_heap *heap, duk_heaphdr *hdr) {
DUK_UNREF(heap);
duk_debug_write_heapptr(thr, hdr);
duk_debug_write_uint(thr, (duk_uint32_t) DUK_HEAPHDR_GET_TYPE(hdr));
duk_debug_write_uint(thr, (duk_uint32_t) DUK_HEAPHDR_GET_FLAGS_RAW(hdr));
#if defined(DUK_USE_REFERENCE_COUNTING)
duk_debug_write_uint(thr, (duk_uint32_t) DUK_HEAPHDR_GET_REFCOUNT(hdr));
#else
duk_debug_write_int(thr, (duk_int32_t) -1);
#endif
switch (DUK_HEAPHDR_GET_TYPE(hdr)) {
case DUK_HTYPE_STRING: {
duk_hstring *h = (duk_hstring *) hdr;
duk_debug_write_uint(thr, (duk_uint32_t) DUK_HSTRING_GET_BYTELEN(h));
duk_debug_write_uint(thr, (duk_uint32_t) DUK_HSTRING_GET_CHARLEN(h));
duk_debug_write_uint(thr, (duk_uint32_t) DUK_HSTRING_GET_HASH(h));
duk_debug_write_hstring(thr, h);
break;
}
case DUK_HTYPE_OBJECT: {
duk_hobject *h = (duk_hobject *) hdr;
duk_hstring *k;
duk_uint_fast32_t i;
duk_debug_write_uint(thr, (duk_uint32_t) DUK_HOBJECT_GET_CLASS_NUMBER(h));
duk_debug_write_heapptr(thr, (duk_heaphdr *) DUK_HOBJECT_GET_PROTOTYPE(heap, h));
duk_debug_write_uint(thr, (duk_uint32_t) DUK_HOBJECT_GET_ESIZE(h));
duk_debug_write_uint(thr, (duk_uint32_t) DUK_HOBJECT_GET_ENEXT(h));
duk_debug_write_uint(thr, (duk_uint32_t) DUK_HOBJECT_GET_ASIZE(h));
duk_debug_write_uint(thr, (duk_uint32_t) DUK_HOBJECT_GET_HSIZE(h));
for (i = 0; i < (duk_uint_fast32_t) DUK_HOBJECT_GET_ENEXT(h); i++) {
duk_debug_write_uint(thr, (duk_uint32_t) DUK_HOBJECT_E_GET_FLAGS(heap, h, i));
k = DUK_HOBJECT_E_GET_KEY(heap, h, i);
duk_debug_write_heapptr(thr, (duk_heaphdr *) k);
if (k == NULL) {
duk_debug_write_int(thr, 0); /* isAccessor */
duk_debug_write_unused(thr);
continue;
}
if (DUK_HOBJECT_E_SLOT_IS_ACCESSOR(heap, h, i)) {
duk_debug_write_int(thr, 1); /* isAccessor */
duk_debug_write_heapptr(thr, (duk_heaphdr *) DUK_HOBJECT_E_GET_VALUE_PTR(heap, h, i)->a.get);
duk_debug_write_heapptr(thr, (duk_heaphdr *) DUK_HOBJECT_E_GET_VALUE_PTR(heap, h, i)->a.set);
} else {
duk_debug_write_int(thr, 0); /* isAccessor */
duk__debug_write_tval_heapptr(thr, &DUK_HOBJECT_E_GET_VALUE_PTR(heap, h, i)->v);
}
}
for (i = 0; i < (duk_uint_fast32_t) DUK_HOBJECT_GET_ASIZE(h); i++) {
/* Note: array dump will include elements beyond
* 'length'.
*/
duk__debug_write_tval_heapptr(thr, DUK_HOBJECT_A_GET_VALUE_PTR(heap, h, i));
}
break;
}
case DUK_HTYPE_BUFFER: {
duk_hbuffer *h = (duk_hbuffer *) hdr;
duk_debug_write_uint(thr, (duk_uint32_t) DUK_HBUFFER_GET_SIZE(h));
duk_debug_write_buffer(thr, (const char *) DUK_HBUFFER_GET_DATA_PTR(heap, h), (duk_size_t) DUK_HBUFFER_GET_SIZE(h));
break;
}
default: {
DUK_D(DUK_DPRINT("invalid htype: %d", (int) DUK_HEAPHDR_GET_TYPE(hdr)));
}
}
}
DUK_LOCAL void duk__debug_dump_heap_allocated(duk_hthread *thr, duk_heap *heap) {
duk_heaphdr *hdr;
hdr = heap->heap_allocated;
while (hdr != NULL) {
duk__debug_dump_heaphdr(thr, heap, hdr);
hdr = DUK_HEAPHDR_GET_NEXT(heap, hdr);
}
}
DUK_LOCAL void duk__debug_dump_strtab(duk_hthread *thr, duk_heap *heap) {
duk_uint32_t i;
duk_hstring *h;
for (i = 0; i < heap->st_size; i++) {
#if defined(DUK_USE_STRTAB_PTRCOMP)
h = DUK_USE_HEAPPTR_DEC16((heap)->heap_udata, heap->strtable16[i]);
#else
h = heap->strtable[i];
#endif
while (h != NULL) {
duk__debug_dump_heaphdr(thr, heap, (duk_heaphdr *) h);
h = h->hdr.h_next;
}
}
}
DUK_LOCAL void duk__debug_handle_dump_heap(duk_hthread *thr, duk_heap *heap) {
DUK_D(DUK_DPRINT("debug command DumpHeap"));
duk_debug_write_reply(thr);
duk__debug_dump_heap_allocated(thr, heap);
duk__debug_dump_strtab(thr, heap);
duk_debug_write_eom(thr);
}
#endif /* DUK_USE_DEBUGGER_DUMPHEAP */
DUK_LOCAL void duk__debug_handle_get_bytecode(duk_hthread *thr, duk_heap *heap) {
duk_activation *act;
duk_hcompfunc *fun = NULL;
duk_size_t i, n;
duk_tval *tv;
duk_hobject **fn;
duk_int32_t level = -1;
duk_uint8_t ibyte;
DUK_UNREF(heap);
DUK_D(DUK_DPRINT("debug command GetBytecode"));
ibyte = duk_debug_peek_byte(thr);
if (ibyte != DUK_DBG_IB_EOM) {
tv = duk_debug_read_tval(thr);
if (tv == NULL) {
/* detached */
return;
}
if (DUK_TVAL_IS_OBJECT(tv)) {
/* tentative, checked later */
fun = (duk_hcompfunc *) DUK_TVAL_GET_OBJECT(tv);
DUK_ASSERT(fun != NULL);
} else if (DUK_TVAL_IS_NUMBER(tv)) {
level = (duk_int32_t) DUK_TVAL_GET_NUMBER(tv);
} else {
DUK_D(DUK_DPRINT("invalid argument to GetBytecode: %!T", tv));
goto fail_args;
}
}
if (fun == NULL) {
act = duk_hthread_get_activation_for_level(thr, level);
if (act == NULL) {
goto fail_index;
}
fun = (duk_hcompfunc *) DUK_ACT_GET_FUNC(act);
}
if (fun == NULL || !DUK_HOBJECT_IS_COMPFUNC((duk_hobject *) fun)) {
DUK_D(DUK_DPRINT("invalid argument to GetBytecode: %!O", fun));
goto fail_args;
}
DUK_ASSERT(fun != NULL && DUK_HOBJECT_IS_COMPFUNC((duk_hobject *) fun));
duk_debug_write_reply(thr);
n = DUK_HCOMPFUNC_GET_CONSTS_COUNT(heap, fun);
duk_debug_write_int(thr, (duk_int32_t) n);
tv = DUK_HCOMPFUNC_GET_CONSTS_BASE(heap, fun);
for (i = 0; i < n; i++) {
duk_debug_write_tval(thr, tv);
tv++;
}
n = DUK_HCOMPFUNC_GET_FUNCS_COUNT(heap, fun);
duk_debug_write_int(thr, (duk_int32_t) n);
fn = DUK_HCOMPFUNC_GET_FUNCS_BASE(heap, fun);
for (i = 0; i < n; i++) {
duk_debug_write_hobject(thr, *fn);
fn++;
}
duk_debug_write_string(thr,
(const char *) DUK_HCOMPFUNC_GET_CODE_BASE(heap, fun),
(duk_size_t) DUK_HCOMPFUNC_GET_CODE_SIZE(heap, fun));
duk_debug_write_eom(thr);
return;
fail_args:
duk_debug_write_error_eom(thr, DUK_DBG_ERR_UNKNOWN, "invalid argument");
return;
fail_index:
duk_debug_write_error_eom(thr, DUK_DBG_ERR_NOTFOUND, "invalid callstack index");
return;
}
/*
* Object inspection commands: GetHeapObjInfo, GetObjPropDesc,
* GetObjPropDescRange
*/
#if defined(DUK_USE_DEBUGGER_INSPECT)
#if 0 /* pruned */
DUK_LOCAL const char * const duk__debug_getinfo_heaphdr_keys[] = {
"reachable",
"temproot",
"finalizable",
"finalized",
"readonly"
/* NULL not needed here */
};
DUK_LOCAL duk_uint_t duk__debug_getinfo_heaphdr_masks[] = {
DUK_HEAPHDR_FLAG_REACHABLE,
DUK_HEAPHDR_FLAG_TEMPROOT,
DUK_HEAPHDR_FLAG_FINALIZABLE,
DUK_HEAPHDR_FLAG_FINALIZED,
DUK_HEAPHDR_FLAG_READONLY,
0 /* terminator */
};
#endif
DUK_LOCAL const char * const duk__debug_getinfo_hstring_keys[] = {
#if 0
"arridx",
"symbol",
"hidden",
"reserved_word",
"strict_reserved_word",
"eval_or_arguments",
#endif
"extdata"
/* NULL not needed here */
};
DUK_LOCAL duk_uint_t duk__debug_getinfo_hstring_masks[] = {
#if 0
DUK_HSTRING_FLAG_ARRIDX,
DUK_HSTRING_FLAG_SYMBOL,
DUK_HSTRING_FLAG_HIDDEN,
DUK_HSTRING_FLAG_RESERVED_WORD,
DUK_HSTRING_FLAG_STRICT_RESERVED_WORD,
DUK_HSTRING_FLAG_EVAL_OR_ARGUMENTS,
#endif
DUK_HSTRING_FLAG_EXTDATA,
0 /* terminator */
};
DUK_LOCAL const char * const duk__debug_getinfo_hobject_keys[] = {
"extensible",
"constructable",
"callable",
"boundfunc",
"compfunc",
"natfunc",
"bufobj",
"fastrefs",
"array_part",
"strict",
"notail",
"newenv",
"namebinding",
"createargs",
"have_finalizer",
"exotic_array",
"exotic_stringobj",
"exotic_arguments",
"exotic_proxyobj",
"special_call"
/* NULL not needed here */
};
DUK_LOCAL duk_uint_t duk__debug_getinfo_hobject_masks[] = {
DUK_HOBJECT_FLAG_EXTENSIBLE,
DUK_HOBJECT_FLAG_CONSTRUCTABLE,
DUK_HOBJECT_FLAG_CALLABLE,
DUK_HOBJECT_FLAG_BOUNDFUNC,
DUK_HOBJECT_FLAG_COMPFUNC,
DUK_HOBJECT_FLAG_NATFUNC,
DUK_HOBJECT_FLAG_BUFOBJ,
DUK_HOBJECT_FLAG_FASTREFS,
DUK_HOBJECT_FLAG_ARRAY_PART,
DUK_HOBJECT_FLAG_STRICT,
DUK_HOBJECT_FLAG_NOTAIL,
DUK_HOBJECT_FLAG_NEWENV,
DUK_HOBJECT_FLAG_NAMEBINDING,
DUK_HOBJECT_FLAG_CREATEARGS,
DUK_HOBJECT_FLAG_HAVE_FINALIZER,
DUK_HOBJECT_FLAG_EXOTIC_ARRAY,
DUK_HOBJECT_FLAG_EXOTIC_STRINGOBJ,
DUK_HOBJECT_FLAG_EXOTIC_ARGUMENTS,
DUK_HOBJECT_FLAG_EXOTIC_PROXYOBJ,
DUK_HOBJECT_FLAG_SPECIAL_CALL,
0 /* terminator */
};
DUK_LOCAL const char * const duk__debug_getinfo_hbuffer_keys[] = {
"dynamic",
"external"
/* NULL not needed here */
};
DUK_LOCAL duk_uint_t duk__debug_getinfo_hbuffer_masks[] = {
DUK_HBUFFER_FLAG_DYNAMIC,
DUK_HBUFFER_FLAG_EXTERNAL,
0 /* terminator */
};
DUK_LOCAL void duk__debug_getinfo_flags_key(duk_hthread *thr, const char *key) {
duk_debug_write_uint(thr, 0);
duk_debug_write_cstring(thr, key);
}
DUK_LOCAL void duk__debug_getinfo_prop_uint(duk_hthread *thr, const char *key, duk_uint_t val) {
duk_debug_write_uint(thr, 0);
duk_debug_write_cstring(thr, key);
duk_debug_write_uint(thr, val);
}
DUK_LOCAL void duk__debug_getinfo_prop_int(duk_hthread *thr, const char *key, duk_int_t val) {
duk_debug_write_uint(thr, 0);
duk_debug_write_cstring(thr, key);
duk_debug_write_int(thr, val);
}
DUK_LOCAL void duk__debug_getinfo_prop_bool(duk_hthread *thr, const char *key, duk_bool_t val) {
duk_debug_write_uint(thr, 0);
duk_debug_write_cstring(thr, key);
duk_debug_write_boolean(thr, val);
}
DUK_LOCAL void duk__debug_getinfo_bitmask(duk_hthread *thr, const char * const * keys, duk_uint_t *masks, duk_uint_t flags) {
const char *key;
duk_uint_t mask;
for (;;) {
mask = *masks++;
if (mask == 0) {
break;
}
key = *keys++;
DUK_ASSERT(key != NULL);
DUK_DD(DUK_DDPRINT("inspect bitmask: key=%s, mask=0x%08lx, flags=0x%08lx", key, (unsigned long) mask, (unsigned long) flags));
duk__debug_getinfo_prop_bool(thr, key, flags & mask);
}
}
/* Inspect a property using a virtual index into a conceptual property list
* consisting of (1) all array part items from [0,a_size[ (even when above
* .length) and (2) all entry part items from [0,e_next[. Unused slots are
* indicated using dvalue 'unused'.
*/
DUK_LOCAL duk_bool_t duk__debug_getprop_index(duk_hthread *thr, duk_heap *heap, duk_hobject *h_obj, duk_uint_t idx) {
duk_uint_t a_size;
duk_tval *tv;
duk_hstring *h_key;
duk_hobject *h_getset;
duk_uint_t flags;
DUK_UNREF(heap);
a_size = DUK_HOBJECT_GET_ASIZE(h_obj);
if (idx < a_size) {
duk_debug_write_uint(thr, DUK_PROPDESC_FLAGS_WEC);
duk_debug_write_uint(thr, idx);
tv = DUK_HOBJECT_A_GET_VALUE_PTR(heap, h_obj, idx);
duk_debug_write_tval(thr, tv);
return 1;
}
idx -= a_size;
if (idx >= DUK_HOBJECT_GET_ENEXT(h_obj)) {
return 0;
}
h_key = DUK_HOBJECT_E_GET_KEY(heap, h_obj, idx);
if (h_key == NULL) {
duk_debug_write_uint(thr, 0);
duk_debug_write_null(thr);
duk_debug_write_unused(thr);
return 1;
}
flags = DUK_HOBJECT_E_GET_FLAGS(heap, h_obj, idx);
if (DUK_HSTRING_HAS_SYMBOL(h_key)) {
flags |= DUK_DBG_PROPFLAG_SYMBOL;
}
if (DUK_HSTRING_HAS_HIDDEN(h_key)) {
flags |= DUK_DBG_PROPFLAG_HIDDEN;
}
duk_debug_write_uint(thr, flags);
duk_debug_write_hstring(thr, h_key);
if (flags & DUK_PROPDESC_FLAG_ACCESSOR) {
h_getset = DUK_HOBJECT_E_GET_VALUE_GETTER(heap, h_obj, idx);
if (h_getset) {
duk_debug_write_hobject(thr, h_getset);
} else {
duk_debug_write_null(thr);
}
h_getset = DUK_HOBJECT_E_GET_VALUE_SETTER(heap, h_obj, idx);
if (h_getset) {
duk_debug_write_hobject(thr, h_getset);
} else {
duk_debug_write_null(thr);
}
} else {
tv = DUK_HOBJECT_E_GET_VALUE_TVAL_PTR(heap, h_obj, idx);
duk_debug_write_tval(thr, tv);
}
return 1;
}
DUK_LOCAL void duk__debug_handle_get_heap_obj_info(duk_hthread *thr, duk_heap *heap) {
duk_heaphdr *h;
DUK_D(DUK_DPRINT("debug command GetHeapObjInfo"));
DUK_UNREF(heap);
DUK_ASSERT(sizeof(duk__debug_getinfo_hstring_keys) / sizeof(const char *) == sizeof(duk__debug_getinfo_hstring_masks) / sizeof(duk_uint_t) - 1);
DUK_ASSERT(sizeof(duk__debug_getinfo_hobject_keys) / sizeof(const char *) == sizeof(duk__debug_getinfo_hobject_masks) / sizeof(duk_uint_t) - 1);
DUK_ASSERT(sizeof(duk__debug_getinfo_hbuffer_keys) / sizeof(const char *) == sizeof(duk__debug_getinfo_hbuffer_masks) / sizeof(duk_uint_t) - 1);
h = duk_debug_read_any_ptr(thr);
if (!h) {
duk_debug_write_error_eom(thr, DUK_DBG_ERR_UNKNOWN, "invalid target");
return;
}
duk_debug_write_reply(thr);
/* As with all inspection code, we rely on the debug client providing
* a valid, non-stale pointer: there's no portable way to safely
* validate the pointer here.
*/
duk__debug_getinfo_flags_key(thr, "heapptr");
duk_debug_write_heapptr(thr, h);
/* XXX: comes out as signed now */
duk__debug_getinfo_prop_uint(thr, "heaphdr_flags", (duk_uint_t) DUK_HEAPHDR_GET_FLAGS(h));
duk__debug_getinfo_prop_uint(thr, "heaphdr_type", (duk_uint_t) DUK_HEAPHDR_GET_TYPE(h));
#if defined(DUK_USE_REFERENCE_COUNTING)
duk__debug_getinfo_prop_uint(thr, "refcount", (duk_uint_t) DUK_HEAPHDR_GET_REFCOUNT(h));
#endif
#if 0 /* pruned */
duk__debug_getinfo_bitmask(thr,
duk__debug_getinfo_heaphdr_keys,
duk__debug_getinfo_heaphdr_masks,
DUK_HEAPHDR_GET_FLAGS_RAW(h));
#endif
switch (DUK_HEAPHDR_GET_TYPE(h)) {
case DUK_HTYPE_STRING: {
duk_hstring *h_str;
h_str = (duk_hstring *) h;
duk__debug_getinfo_bitmask(thr,
duk__debug_getinfo_hstring_keys,
duk__debug_getinfo_hstring_masks,
DUK_HEAPHDR_GET_FLAGS_RAW(h));
duk__debug_getinfo_prop_uint(thr, "bytelen", (duk_uint_t) DUK_HSTRING_GET_BYTELEN(h_str));
duk__debug_getinfo_prop_uint(thr, "charlen", (duk_uint_t) DUK_HSTRING_GET_CHARLEN(h_str));
duk__debug_getinfo_prop_uint(thr, "hash", (duk_uint_t) DUK_HSTRING_GET_HASH(h_str));
duk__debug_getinfo_flags_key(thr, "data");
duk_debug_write_hstring(thr, h_str);
break;
}
case DUK_HTYPE_OBJECT: {
duk_hobject *h_obj;
duk_hobject *h_proto;
h_obj = (duk_hobject *) h;
h_proto = DUK_HOBJECT_GET_PROTOTYPE(heap, h_obj);
/* duk_hobject specific fields. */
duk__debug_getinfo_bitmask(thr,
duk__debug_getinfo_hobject_keys,
duk__debug_getinfo_hobject_masks,
DUK_HEAPHDR_GET_FLAGS_RAW(h));
duk__debug_getinfo_prop_uint(thr, "class_number", DUK_HOBJECT_GET_CLASS_NUMBER(h_obj));
duk__debug_getinfo_flags_key(thr, "class_name");
duk_debug_write_hstring(thr, DUK_HOBJECT_GET_CLASS_STRING(heap, h_obj));
duk__debug_getinfo_flags_key(thr, "prototype");
if (h_proto != NULL) {
duk_debug_write_hobject(thr, h_proto);
} else {
duk_debug_write_null(thr);
}
duk__debug_getinfo_flags_key(thr, "props");
duk_debug_write_pointer(thr, (void *) DUK_HOBJECT_GET_PROPS(heap, h_obj));
duk__debug_getinfo_prop_uint(thr, "e_size", (duk_uint_t) DUK_HOBJECT_GET_ESIZE(h_obj));
duk__debug_getinfo_prop_uint(thr, "e_next", (duk_uint_t) DUK_HOBJECT_GET_ENEXT(h_obj));
duk__debug_getinfo_prop_uint(thr, "a_size", (duk_uint_t) DUK_HOBJECT_GET_ASIZE(h_obj));
duk__debug_getinfo_prop_uint(thr, "h_size", (duk_uint_t) DUK_HOBJECT_GET_HSIZE(h_obj));
if (DUK_HOBJECT_IS_ARRAY(h_obj)) {
duk_harray *h_arr;
h_arr = (duk_harray *) h_obj;
duk__debug_getinfo_prop_uint(thr, "length", (duk_uint_t) h_arr->length);
duk__debug_getinfo_prop_bool(thr, "length_nonwritable", h_arr->length_nonwritable);
}
if (DUK_HOBJECT_IS_NATFUNC(h_obj)) {
duk_hnatfunc *h_fun;
h_fun = (duk_hnatfunc *) h_obj;
duk__debug_getinfo_prop_int(thr, "nargs", h_fun->nargs);
duk__debug_getinfo_prop_int(thr, "magic", h_fun->magic);
duk__debug_getinfo_prop_bool(thr, "varargs", h_fun->magic == DUK_HNATFUNC_NARGS_VARARGS);
/* Native function pointer may be different from a void pointer,
* and we serialize it from memory directly now (no byte swapping etc).
*/
duk__debug_getinfo_flags_key(thr, "funcptr");
duk_debug_write_buffer(thr, (const char *) &h_fun->func, sizeof(h_fun->func));
}
if (DUK_HOBJECT_IS_COMPFUNC(h_obj)) {
duk_hcompfunc *h_fun;
duk_hbuffer *h_buf;
duk_hobject *h_lexenv;
duk_hobject *h_varenv;
h_fun = (duk_hcompfunc *) h_obj;
duk__debug_getinfo_prop_int(thr, "nregs", h_fun->nregs);
duk__debug_getinfo_prop_int(thr, "nargs", h_fun->nargs);
duk__debug_getinfo_flags_key(thr, "lex_env");
h_lexenv = DUK_HCOMPFUNC_GET_LEXENV(thr->heap, h_fun);
if (h_lexenv != NULL) {
duk_debug_write_hobject(thr, h_lexenv);
} else {
duk_debug_write_null(thr);
}
duk__debug_getinfo_flags_key(thr, "var_env");
h_varenv = DUK_HCOMPFUNC_GET_VARENV(thr->heap, h_fun);
if (h_varenv != NULL) {
duk_debug_write_hobject(thr, h_varenv);
} else {
duk_debug_write_null(thr);
}
duk__debug_getinfo_prop_uint(thr, "start_line", h_fun->start_line);
duk__debug_getinfo_prop_uint(thr, "end_line", h_fun->end_line);
h_buf = (duk_hbuffer *) DUK_HCOMPFUNC_GET_DATA(thr->heap, h_fun);
if (h_buf != NULL) {
duk__debug_getinfo_flags_key(thr, "data");
duk_debug_write_heapptr(thr, (duk_heaphdr *) h_buf);
}
}
if (DUK_HOBJECT_IS_BOUNDFUNC(h_obj)) {
duk_hboundfunc *h_bfun;
h_bfun = (duk_hboundfunc *) (void *) h_obj;
duk__debug_getinfo_flags_key(thr, "target");
duk_debug_write_tval(thr, &h_bfun->target);
duk__debug_getinfo_flags_key(thr, "this_binding");
duk_debug_write_tval(thr, &h_bfun->this_binding);
duk__debug_getinfo_flags_key(thr, "nargs");
duk_debug_write_int(thr, h_bfun->nargs);
/* h_bfun->args not exposed now */
}
if (DUK_HOBJECT_IS_THREAD(h_obj)) {
/* XXX: Currently no inspection of threads, e.g. value stack, call
* stack, catch stack, etc.
*/
duk_hthread *h_thr;
h_thr = (duk_hthread *) h_obj;
DUK_UNREF(h_thr);
}
if (DUK_HOBJECT_IS_DECENV(h_obj)) {
duk_hdecenv *h_env;
h_env = (duk_hdecenv *) h_obj;
duk__debug_getinfo_flags_key(thr, "thread");
duk_debug_write_heapptr(thr, (duk_heaphdr *) (h_env->thread));
duk__debug_getinfo_flags_key(thr, "varmap");
duk_debug_write_heapptr(thr, (duk_heaphdr *) (h_env->varmap));
duk__debug_getinfo_prop_uint(thr, "regbase", (duk_uint_t) h_env->regbase_byteoff);
}
if (DUK_HOBJECT_IS_OBJENV(h_obj)) {
duk_hobjenv *h_env;
h_env = (duk_hobjenv *) h_obj;
duk__debug_getinfo_flags_key(thr, "target");
duk_debug_write_heapptr(thr, (duk_heaphdr *) (h_env->target));
duk__debug_getinfo_prop_bool(thr, "has_this", h_env->has_this);
}
#if defined(DUK_USE_BUFFEROBJECT_SUPPORT)
if (DUK_HOBJECT_IS_BUFOBJ(h_obj)) {
duk_hbufobj *h_bufobj;
h_bufobj = (duk_hbufobj *) h_obj;
duk__debug_getinfo_prop_uint(thr, "slice_offset", h_bufobj->offset);
duk__debug_getinfo_prop_uint(thr, "slice_length", h_bufobj->length);
duk__debug_getinfo_prop_uint(thr, "elem_shift", (duk_uint_t) h_bufobj->shift);
duk__debug_getinfo_prop_uint(thr, "elem_type", (duk_uint_t) h_bufobj->elem_type);
duk__debug_getinfo_prop_bool(thr, "is_typedarray", (duk_uint_t) h_bufobj->is_typedarray);
if (h_bufobj->buf != NULL) {
duk__debug_getinfo_flags_key(thr, "buffer");
duk_debug_write_heapptr(thr, (duk_heaphdr *) h_bufobj->buf);
}
}
#endif /* DUK_USE_BUFFEROBJECT_SUPPORT */
break;
}
case DUK_HTYPE_BUFFER: {
duk_hbuffer *h_buf;
h_buf = (duk_hbuffer *) h;
duk__debug_getinfo_bitmask(thr,
duk__debug_getinfo_hbuffer_keys,
duk__debug_getinfo_hbuffer_masks,
DUK_HEAPHDR_GET_FLAGS_RAW(h));
duk__debug_getinfo_prop_uint(thr, "size", (duk_uint_t) DUK_HBUFFER_GET_SIZE(h_buf));
duk__debug_getinfo_flags_key(thr, "dataptr");
duk_debug_write_pointer(thr, (void *) DUK_HBUFFER_GET_DATA_PTR(thr->heap, h_buf));
duk__debug_getinfo_flags_key(thr, "data");
duk_debug_write_hbuffer(thr, h_buf); /* tolerates NULL h_buf */
break;
}
default: {
/* Since we already started writing the reply, just emit nothing. */
DUK_D(DUK_DPRINT("inspect target pointer has invalid heaphdr type"));
}
}
duk_debug_write_eom(thr);
}
DUK_LOCAL void duk__debug_handle_get_obj_prop_desc(duk_hthread *thr, duk_heap *heap) {
duk_heaphdr *h;
duk_hobject *h_obj;
duk_hstring *h_key;
duk_propdesc desc;
DUK_D(DUK_DPRINT("debug command GetObjPropDesc"));
DUK_UNREF(heap);
h = duk_debug_read_any_ptr(thr);
if (!h) {
duk_debug_write_error_eom(thr, DUK_DBG_ERR_UNKNOWN, "invalid target");
return;
}
h_key = duk_debug_read_hstring(thr);
if (h == NULL || DUK_HEAPHDR_GET_TYPE(h) != DUK_HTYPE_OBJECT || h_key == NULL) {
goto fail_args;
}
h_obj = (duk_hobject *) h;
if (duk_hobject_get_own_propdesc(thr, h_obj, h_key, &desc, 0 /*flags*/)) {
duk_int_t virtual_idx;
duk_bool_t rc;
/* To use the shared helper need the virtual index. */
DUK_ASSERT(desc.e_idx >= 0 || desc.a_idx >= 0);
virtual_idx = (desc.a_idx >= 0 ? desc.a_idx :
(duk_int_t) DUK_HOBJECT_GET_ASIZE(h_obj) + desc.e_idx);
duk_debug_write_reply(thr);
rc = duk__debug_getprop_index(thr, heap, h_obj, (duk_uint_t) virtual_idx);
DUK_ASSERT(rc == 1);
DUK_UNREF(rc);
duk_debug_write_eom(thr);
} else {
duk_debug_write_error_eom(thr, DUK_DBG_ERR_NOTFOUND, "not found");
}
return;
fail_args:
duk_debug_write_error_eom(thr, DUK_DBG_ERR_UNKNOWN, "invalid args");
}
DUK_LOCAL void duk__debug_handle_get_obj_prop_desc_range(duk_hthread *thr, duk_heap *heap) {
duk_heaphdr *h;
duk_hobject *h_obj;
duk_uint_t idx, idx_start, idx_end;
DUK_D(DUK_DPRINT("debug command GetObjPropDescRange"));
DUK_UNREF(heap);
h = duk_debug_read_any_ptr(thr);
idx_start = (duk_uint_t) duk_debug_read_int(thr);
idx_end = (duk_uint_t) duk_debug_read_int(thr);
if (h == NULL || DUK_HEAPHDR_GET_TYPE(h) != DUK_HTYPE_OBJECT) {
goto fail_args;
}
h_obj = (duk_hobject *) h;
/* The index range space is conceptually the array part followed by the
* entry part. Unlike normal enumeration all slots are exposed here as
* is and return 'unused' if the slots are not in active use. In particular
* the array part is included for the full a_size regardless of what the
* array .length is.
*/
duk_debug_write_reply(thr);
for (idx = idx_start; idx < idx_end; idx++) {
if (!duk__debug_getprop_index(thr, heap, h_obj, idx)) {
break;
}
}
duk_debug_write_eom(thr);
return;
fail_args:
duk_debug_write_error_eom(thr, DUK_DBG_ERR_UNKNOWN, "invalid args");
}
#endif /* DUK_USE_DEBUGGER_INSPECT */
/*
* Process incoming debug requests
*
* Individual request handlers can push temporaries on the value stack and
* rely on duk__debug_process_message() to restore the value stack top
* automatically.
*/
/* Process one debug message. Automatically restore value stack top to its
* entry value, so that individual message handlers don't need exact value
* stack handling which is convenient.
*/
DUK_LOCAL void duk__debug_process_message(duk_hthread *thr) {
duk_heap *heap;
duk_uint8_t x;
duk_int32_t cmd;
duk_idx_t entry_top;
DUK_ASSERT(thr != NULL);
heap = thr->heap;
DUK_ASSERT(heap != NULL);
entry_top = duk_get_top(thr);
x = duk_debug_read_byte(thr);
switch (x) {
case DUK_DBG_IB_REQUEST: {
cmd = duk_debug_read_int(thr);
switch (cmd) {
case DUK_DBG_CMD_BASICINFO: {
duk__debug_handle_basic_info(thr, heap);
break;
}
case DUK_DBG_CMD_TRIGGERSTATUS: {
duk__debug_handle_trigger_status(thr, heap);
break;
}
case DUK_DBG_CMD_PAUSE: {
duk__debug_handle_pause(thr, heap);
break;
}
case DUK_DBG_CMD_RESUME: {
duk__debug_handle_resume(thr, heap);
break;
}
case DUK_DBG_CMD_STEPINTO:
case DUK_DBG_CMD_STEPOVER:
case DUK_DBG_CMD_STEPOUT: {
duk__debug_handle_step(thr, heap, cmd);
break;
}
case DUK_DBG_CMD_LISTBREAK: {
duk__debug_handle_list_break(thr, heap);
break;
}
case DUK_DBG_CMD_ADDBREAK: {
duk__debug_handle_add_break(thr, heap);
break;
}
case DUK_DBG_CMD_DELBREAK: {
duk__debug_handle_del_break(thr, heap);
break;
}
case DUK_DBG_CMD_GETVAR: {
duk__debug_handle_get_var(thr, heap);
break;
}
case DUK_DBG_CMD_PUTVAR: {
duk__debug_handle_put_var(thr, heap);
break;
}
case DUK_DBG_CMD_GETCALLSTACK: {
duk__debug_handle_get_call_stack(thr, heap);
break;
}
case DUK_DBG_CMD_GETLOCALS: {
duk__debug_handle_get_locals(thr, heap);
break;
}
case DUK_DBG_CMD_EVAL: {
duk__debug_handle_eval(thr, heap);
break;
}
case DUK_DBG_CMD_DETACH: {
/* The actual detached_cb call is postponed to message loop so
* we don't need any special precautions here (just skip to EOM
* on the already closed connection).
*/
duk__debug_handle_detach(thr, heap);
break;
}
#if defined(DUK_USE_DEBUGGER_DUMPHEAP)
case DUK_DBG_CMD_DUMPHEAP: {
duk__debug_handle_dump_heap(thr, heap);
break;
}
#endif /* DUK_USE_DEBUGGER_DUMPHEAP */
case DUK_DBG_CMD_GETBYTECODE: {
duk__debug_handle_get_bytecode(thr, heap);
break;
}
case DUK_DBG_CMD_APPREQUEST: {
duk__debug_handle_apprequest(thr, heap);
break;
}
#if defined(DUK_USE_DEBUGGER_INSPECT)
case DUK_DBG_CMD_GETHEAPOBJINFO: {
duk__debug_handle_get_heap_obj_info(thr, heap);
break;
}
case DUK_DBG_CMD_GETOBJPROPDESC: {
duk__debug_handle_get_obj_prop_desc(thr, heap);
break;
}
case DUK_DBG_CMD_GETOBJPROPDESCRANGE: {
duk__debug_handle_get_obj_prop_desc_range(thr, heap);
break;
}
#endif /* DUK_USE_DEBUGGER_INSPECT */
default: {
DUK_D(DUK_DPRINT("debug command unsupported: %d", (int) cmd));
duk_debug_write_error_eom(thr, DUK_DBG_ERR_UNSUPPORTED, "unsupported command");
}
} /* switch cmd */
break;
}
case DUK_DBG_IB_REPLY: {
DUK_D(DUK_DPRINT("debug reply, skipping"));
break;
}
case DUK_DBG_IB_ERROR: {
DUK_D(DUK_DPRINT("debug error, skipping"));
break;
}
case DUK_DBG_IB_NOTIFY: {
DUK_D(DUK_DPRINT("debug notify, skipping"));
break;
}
default: {
DUK_D(DUK_DPRINT("invalid initial byte, drop connection: %d", (int) x));
goto fail;
}
} /* switch initial byte */
DUK_ASSERT(duk_get_top(thr) >= entry_top);
duk_set_top(thr, entry_top);
duk__debug_skip_to_eom(thr);
return;
fail:
DUK_ASSERT(duk_get_top(thr) >= entry_top);
duk_set_top(thr, entry_top);
DUK__SET_CONN_BROKEN(thr, 1);
return;
}
DUK_LOCAL void duk__check_resend_status(duk_hthread *thr) {
if (thr->heap->dbg_read_cb != NULL && thr->heap->dbg_state_dirty) {
duk_debug_send_status(thr);
thr->heap->dbg_state_dirty = 0;
}
}
DUK_INTERNAL duk_bool_t duk_debug_process_messages(duk_hthread *thr, duk_bool_t no_block) {
#if defined(DUK_USE_ASSERTIONS)
duk_idx_t entry_top;
#endif
duk_bool_t retval = 0;
DUK_ASSERT(thr != NULL);
DUK_ASSERT(thr->heap != NULL);
#if defined(DUK_USE_ASSERTIONS)
entry_top = duk_get_top(thr);
#endif
DUK_D(DUK_DPRINT("process debug messages: read_cb=%s, no_block=%ld, detaching=%ld, processing=%ld",
thr->heap->dbg_read_cb ? "not NULL" : "NULL", (long) no_block,
(long) thr->heap->dbg_detaching, (long) thr->heap->dbg_processing));
DUK_DD(DUK_DDPRINT("top at entry: %ld", (long) duk_get_top(thr)));
/* thr->heap->dbg_detaching may be != 0 if a debugger write outside
* the message loop caused a transport error and detach1() to run.
*/
DUK_ASSERT(thr->heap->dbg_detaching == 0 || thr->heap->dbg_detaching == 1);
DUK_ASSERT(thr->heap->dbg_processing == 0);
thr->heap->dbg_processing = 1;
/* Ensure dirty state causes a Status even if never process any
* messages. This is expected by the bytecode executor when in
* the running state.
*/
duk__check_resend_status(thr);
for (;;) {
/* Process messages until we're no longer paused or we peek
* and see there's nothing to read right now.
*/
DUK_DD(DUK_DDPRINT("top at loop top: %ld", (long) duk_get_top(thr)));
DUK_ASSERT(thr->heap->dbg_processing == 1);
while (thr->heap->dbg_read_cb == NULL && thr->heap->dbg_detaching) {
/* Detach is pending; can be triggered from outside the
* debugger loop (e.g. Status notify write error) or by
* previous message handling. Call detached callback
* here, in a controlled state, to ensure a possible
* reattach inside the detached_cb is handled correctly.
*
* Recheck for detach in a while loop: an immediate
* reattach involves a call to duk_debugger_attach()
* which writes a debugger handshake line immediately
* inside the API call. If the transport write fails
* for that handshake, we can immediately end up in a
* "transport broken, detaching" case several times here.
* Loop back until we're either cleanly attached or
* fully detached.
*
* NOTE: Reset dbg_processing = 1 forcibly, in case we
* re-attached; duk_debugger_attach() sets dbg_processing
* to 0 at the moment.
*/
DUK_D(DUK_DPRINT("detach pending (dbg_read_cb == NULL, dbg_detaching != 0), call detach2"));
duk__debug_do_detach2(thr->heap);
thr->heap->dbg_processing = 1; /* may be set to 0 by duk_debugger_attach() inside callback */
DUK_D(DUK_DPRINT("after detach2 (and possible reattach): dbg_read_cb=%s, dbg_detaching=%ld",
thr->heap->dbg_read_cb ? "not NULL" : "NULL", (long) thr->heap->dbg_detaching));
}
DUK_ASSERT(thr->heap->dbg_detaching == 0); /* true even with reattach */
DUK_ASSERT(thr->heap->dbg_processing == 1); /* even after a detach and possible reattach */
if (thr->heap->dbg_read_cb == NULL) {
DUK_D(DUK_DPRINT("debug connection broken (and not detaching), stop processing messages"));
break;
}
if (!DUK_HEAP_HAS_DEBUGGER_PAUSED(thr->heap) || no_block) {
if (!duk_debug_read_peek(thr)) {
/* Note: peek cannot currently trigger a detach
* so the dbg_detaching == 0 assert outside the
* loop is correct.
*/
DUK_D(DUK_DPRINT("processing debug message, peek indicated no data, stop processing messages"));
break;
}
DUK_D(DUK_DPRINT("processing debug message, peek indicated there is data, handle it"));
} else {
DUK_D(DUK_DPRINT("paused, process debug message, blocking if necessary"));
}
duk__check_resend_status(thr);
duk__debug_process_message(thr);
duk__check_resend_status(thr);
retval = 1; /* processed one or more messages */
}
DUK_ASSERT(thr->heap->dbg_detaching == 0);
DUK_ASSERT(thr->heap->dbg_processing == 1);
thr->heap->dbg_processing = 0;
/* As an initial implementation, read flush after exiting the message
* loop. If transport is broken, this is a no-op (with debug logs).
*/
duk_debug_read_flush(thr); /* this cannot initiate a detach */
DUK_ASSERT(thr->heap->dbg_detaching == 0);
DUK_DD(DUK_DDPRINT("top at exit: %ld", (long) duk_get_top(thr)));
#if defined(DUK_USE_ASSERTIONS)
/* Easy to get wrong, so assert for it. */
DUK_ASSERT(entry_top == duk_get_top(thr));
#endif
return retval;
}
/*
* Halt execution helper
*/
/* Halt execution and enter a debugger message loop until execution is resumed
* by the client. PC for the current activation may be temporarily decremented
* so that the "current" instruction will be shown by the client. This helper
* is callable from anywhere, also outside bytecode executor.
*/
DUK_INTERNAL void duk_debug_halt_execution(duk_hthread *thr, duk_bool_t use_prev_pc) {
duk_activation *act;
duk_hcompfunc *fun;
duk_instr_t *old_pc = NULL;
DUK_ASSERT(thr != NULL);
DUK_ASSERT(thr->heap != NULL);
DUK_ASSERT(duk_debug_is_attached(thr->heap));
DUK_ASSERT(thr->heap->dbg_processing == 0);
DUK_ASSERT(!duk_debug_is_paused(thr->heap));
duk_debug_set_paused(thr->heap);
act = thr->callstack_curr;
/* NOTE: act may be NULL if an error is thrown outside of any activation,
* which may happen in the case of, e.g. syntax errors.
*/
/* Decrement PC if that was requested, this requires a PC sync. */
if (act != NULL) {
duk_hthread_sync_currpc(thr);
old_pc = act->curr_pc;
fun = (duk_hcompfunc *) DUK_ACT_GET_FUNC(act);
/* Short circuit if is safe: if act->curr_pc != NULL, 'fun' is
* guaranteed to be a non-NULL ECMAScript function.
*/
DUK_ASSERT(act->curr_pc == NULL ||
(fun != NULL && DUK_HOBJECT_IS_COMPFUNC((duk_hobject *) fun)));
if (use_prev_pc &&
act->curr_pc != NULL &&
act->curr_pc > DUK_HCOMPFUNC_GET_CODE_BASE(thr->heap, fun)) {
act->curr_pc--;
}
}
/* Process debug messages until we are no longer paused. */
/* NOTE: This is a bit fragile. It's important to ensure that
* duk_debug_process_messages() never throws an error or
* act->curr_pc will never be reset.
*/
thr->heap->dbg_state_dirty = 1;
while (DUK_HEAP_HAS_DEBUGGER_PAUSED(thr->heap)) {
DUK_ASSERT(duk_debug_is_attached(thr->heap));
DUK_ASSERT(thr->heap->dbg_processing == 0);
duk_debug_process_messages(thr, 0 /*no_block*/);
}
/* XXX: Decrementing and restoring act->curr_pc works now, but if the
* debugger message loop gains the ability to adjust the current PC
* (e.g. a forced jump) restoring the PC here will break. Another
* approach would be to use a state flag for the "decrement 1 from
* topmost activation's PC" and take it into account whenever dealing
* with PC values.
*/
if (act != NULL) {
act->curr_pc = old_pc; /* restore PC */
}
}
/*
* Breakpoint management
*/
DUK_INTERNAL duk_small_int_t duk_debug_add_breakpoint(duk_hthread *thr, duk_hstring *filename, duk_uint32_t line) {
duk_heap *heap;
duk_breakpoint *b;
/* Caller must trigger recomputation of active breakpoint list. To
* ensure stale values are not used if that doesn't happen, clear the
* active breakpoint list here.
*/
DUK_ASSERT(thr != NULL);
DUK_ASSERT(filename != NULL);
heap = thr->heap;
DUK_ASSERT(heap != NULL);
if (heap->dbg_breakpoint_count >= DUK_HEAP_MAX_BREAKPOINTS) {
DUK_D(DUK_DPRINT("failed to add breakpoint for %O:%ld, all breakpoint slots used",
(duk_heaphdr *) filename, (long) line));
return -1;
}
heap->dbg_breakpoints_active[0] = (duk_breakpoint *) NULL;
b = heap->dbg_breakpoints + (heap->dbg_breakpoint_count++);
b->filename = filename;
b->line = line;
DUK_HSTRING_INCREF(thr, filename);
return (duk_small_int_t) (heap->dbg_breakpoint_count - 1); /* index */
}
DUK_INTERNAL duk_bool_t duk_debug_remove_breakpoint(duk_hthread *thr, duk_small_uint_t breakpoint_index) {
duk_heap *heap;
duk_hstring *h;
duk_breakpoint *b;
duk_size_t move_size;
/* Caller must trigger recomputation of active breakpoint list. To
* ensure stale values are not used if that doesn't happen, clear the
* active breakpoint list here.
*/
DUK_ASSERT(thr != NULL);
heap = thr->heap;
DUK_ASSERT(heap != NULL);
DUK_ASSERT(duk_debug_is_attached(thr->heap));
DUK_ASSERT_DISABLE(breakpoint_index >= 0); /* unsigned */
if (breakpoint_index >= heap->dbg_breakpoint_count) {
DUK_D(DUK_DPRINT("invalid breakpoint index: %ld", (long) breakpoint_index));
return 0;
}
b = heap->dbg_breakpoints + breakpoint_index;
h = b->filename;
DUK_ASSERT(h != NULL);
move_size = sizeof(duk_breakpoint) * (heap->dbg_breakpoint_count - breakpoint_index - 1);
duk_memmove((void *) b,
(const void *) (b + 1),
(size_t) move_size);
heap->dbg_breakpoint_count--;
heap->dbg_breakpoints_active[0] = (duk_breakpoint *) NULL;
DUK_HSTRING_DECREF(thr, h); /* side effects */
DUK_UNREF(h); /* w/o refcounting */
/* Breakpoint entries above the used area are left as garbage. */
return 1;
}
/*
* Misc state management
*/
DUK_INTERNAL duk_bool_t duk_debug_is_attached(duk_heap *heap) {
return (heap->dbg_read_cb != NULL);
}
DUK_INTERNAL duk_bool_t duk_debug_is_paused(duk_heap *heap) {
return (DUK_HEAP_HAS_DEBUGGER_PAUSED(heap) != 0);
}
DUK_INTERNAL void duk_debug_set_paused(duk_heap *heap) {
if (duk_debug_is_paused(heap)) {
DUK_D(DUK_DPRINT("trying to set paused state when already paused, ignoring"));
} else {
DUK_HEAP_SET_DEBUGGER_PAUSED(heap);
heap->dbg_state_dirty = 1;
duk_debug_clear_pause_state(heap);
DUK_ASSERT(heap->ms_running == 0); /* debugger can't be triggered within mark-and-sweep */
heap->ms_running = 2; /* prevent mark-and-sweep, prevent refzero queueing */
heap->ms_prevent_count++;
DUK_ASSERT(heap->ms_prevent_count != 0); /* Wrap. */
DUK_ASSERT(heap->heap_thread != NULL);
}
}
DUK_INTERNAL void duk_debug_clear_paused(duk_heap *heap) {
if (duk_debug_is_paused(heap)) {
DUK_HEAP_CLEAR_DEBUGGER_PAUSED(heap);
heap->dbg_state_dirty = 1;
duk_debug_clear_pause_state(heap);
DUK_ASSERT(heap->ms_running == 2);
DUK_ASSERT(heap->ms_prevent_count > 0);
heap->ms_prevent_count--;
heap->ms_running = 0;
DUK_ASSERT(heap->heap_thread != NULL);
} else {
DUK_D(DUK_DPRINT("trying to clear paused state when not paused, ignoring"));
}
}
DUK_INTERNAL void duk_debug_clear_pause_state(duk_heap *heap) {
heap->dbg_pause_flags = 0;
heap->dbg_pause_act = NULL;
heap->dbg_pause_startline = 0;
}
#else /* DUK_USE_DEBUGGER_SUPPORT */
/* No debugger support. */
#endif /* DUK_USE_DEBUGGER_SUPPORT */
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