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Make libcxxrt's parsing of DWARF exception handling tables work on

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architectures with strict alignment, by using memcpy() instead of
directly reading fields.

Reported by:	Daisuke Aoyama <aoyama@peach.ne.jp>
Reviewed by:	imp, bapt
Tested by:	bapt
MFC after:	3 days
Differential Revision: https://reviews.freebsd.org/D1967
This commit is contained in:
dim 2015-02-26 07:20:05 +00:00
parent 4d42a57ca7
commit ea2f309a40
1 changed files with 8 additions and 10 deletions
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18
contrib/libcxxrt/dwarf_eh.h
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@ -218,15 +218,17 @@ static int64_t read_sleb128(dw_eh_ptr_t *data)
static uint64_t read_value(char encoding, dw_eh_ptr_t *data)
{
enum dwarf_data_encoding type = get_encoding(encoding);
uint64_t v;
switch (type)
{
// Read fixed-length types
#define READ(dwarf, type) \
case dwarf:\
v = static_cast<uint64_t>(*reinterpret_cast<type*>(*data));\
*data += sizeof(type);\
break;
{\
type t;\
memcpy(&t, *data, sizeof t);\
*data += sizeof t;\
return static_cast<uint64_t>(t);\
}
READ(DW_EH_PE_udata2, uint16_t)
READ(DW_EH_PE_udata4, uint32_t)
READ(DW_EH_PE_udata8, uint64_t)
@ -237,15 +239,11 @@ static uint64_t read_value(char encoding, dw_eh_ptr_t *data)
#undef READ
// Read variable-length types
case DW_EH_PE_sleb128:
v = read_sleb128(data);
break;
return read_sleb128(data);
case DW_EH_PE_uleb128:
v = read_uleb128(data);
break;
return read_uleb128(data);
default: abort();
}
return v;
}
/**