/*
* mono_unwind_ops_encode:
*
* Encode the unwind ops in UNWIND_OPS into the compact DWARF encoding.
* Return a pointer to malloc'ed memory.
*/
guint8*
mono_unwind_ops_encode (GSList *unwind_ops, guint32 *out_len)
{
GSList *l;
MonoUnwindOp *op;
int loc;
guint8 *buf, *p, *res;
p = buf = g_malloc0 (4096);
loc = 0;
l = unwind_ops;
for (; l; l = l->next) {
int reg;
op = l->data;
/* Convert the register from the hw encoding to the dwarf encoding */
reg = mono_hw_reg_to_dwarf_reg (op->reg);
/* Emit an advance_loc if neccesary */
while (op->when > loc) {
if (op->when - loc < 32) {
*p ++ = DW_CFA_advance_loc | (op->when - loc);
loc = op->when;
} else {
*p ++ = DW_CFA_advance_loc | (30);
loc += 30;
}
}
switch (op->op) {
case DW_CFA_def_cfa:
*p ++ = op->op;
encode_uleb128 (reg, p, &p);
encode_uleb128 (op->val, p, &p);
break;
case DW_CFA_def_cfa_offset:
*p ++ = op->op;
encode_uleb128 (op->val, p, &p);
break;
case DW_CFA_def_cfa_register:
*p ++ = op->op;
encode_uleb128 (reg, p, &p);
break;
case DW_CFA_offset:
if (reg > 63) {
*p ++ = DW_CFA_offset_extended_sf;
encode_uleb128 (reg, p, &p);
encode_sleb128 (op->val / DWARF_DATA_ALIGN, p, &p);
} else {
*p ++ = DW_CFA_offset | reg;
encode_uleb128 (op->val / DWARF_DATA_ALIGN, p, &p);
}
break;
default:
g_assert_not_reached ();
break;
}
}
g_assert (p - buf < 4096);
*out_len = p - buf;
res = g_malloc (p - buf);
memcpy (res, buf, p - buf);
g_free (buf);
return res;
}
/*
* mono_unwind_ops_encode:
*
* Encode the unwind ops in UNWIND_OPS into the compact DWARF encoding.
* Return a pointer to malloc'ed memory.
*/
guint8*
mono_unwind_ops_encode (GSList *unwind_ops, guint32 *out_len)
{
GSList *l;
MonoUnwindOp *op;
int loc;
guint8 buf [4096];
guint8 *p, *res;
p = buf;
loc = 0;
l = unwind_ops;
for (; l; l = l->next) {
int reg;
op = l->data;
/* Convert the register from the hw encoding to the dwarf encoding */
reg = mono_hw_reg_to_dwarf_reg (op->reg);
if (op->op == DW_CFA_mono_advance_loc) {
/* This advances loc to its location */
loc = op->when;
}
/* Emit an advance_loc if neccesary */
while (op->when > loc) {
if (op->when - loc > 65536) {
*p ++ = DW_CFA_advance_loc4;
*(guint32*)p = (guint32)(op->when - loc);
g_assert (read32 (p) == (guint32)(op->when - loc));
p += 4;
loc = op->when;
} else if (op->when - loc > 256) {
*p ++ = DW_CFA_advance_loc2;
*(guint16*)p = (guint16)(op->when - loc);
g_assert (read16 (p) == (guint32)(op->when - loc));
p += 2;
loc = op->when;
} else if (op->when - loc >= 32) {
*p ++ = DW_CFA_advance_loc1;
*(guint8*)p = (guint8)(op->when - loc);
p += 1;
loc = op->when;
} else if (op->when - loc < 32) {
*p ++ = DW_CFA_advance_loc | (op->when - loc);
loc = op->when;
} else {
*p ++ = DW_CFA_advance_loc | (30);
loc += 30;
}
}
switch (op->op) {
case DW_CFA_def_cfa:
*p ++ = op->op;
encode_uleb128 (reg, p, &p);
encode_uleb128 (op->val, p, &p);
break;
case DW_CFA_def_cfa_offset:
*p ++ = op->op;
encode_uleb128 (op->val, p, &p);
break;
case DW_CFA_def_cfa_register:
*p ++ = op->op;
encode_uleb128 (reg, p, &p);
break;
case DW_CFA_same_value:
*p ++ = op->op;
encode_uleb128 (reg, p, &p);
break;
case DW_CFA_offset:
if (reg > 63) {
*p ++ = DW_CFA_offset_extended_sf;
encode_uleb128 (reg, p, &p);
encode_sleb128 (op->val / DWARF_DATA_ALIGN, p, &p);
} else {
*p ++ = DW_CFA_offset | reg;
encode_uleb128 (op->val / DWARF_DATA_ALIGN, p, &p);
}
break;
case DW_CFA_remember_state:
case DW_CFA_restore_state:
*p ++ = op->op;
break;
case DW_CFA_mono_advance_loc:
/* Only one location is supported */
g_assert (op->val == 0);
*p ++ = op->op;
break;
default:
g_assert_not_reached ();
break;
}
}
g_assert (p - buf < 4096);
*out_len = p - buf;
res = g_malloc (p - buf);
memcpy (res, buf, p - buf);
return res;
}
