http://llvm.org/bugs/show_bug.cgi?id=18248
Bug ID: 18248
Summary: [-cxx-abi microsoft] Mange string literals properly
Product: clang
Version: unspecified
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P
Component: LLVM Codegen
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
consider:
inline char const *g() {
static char *b = "\00\00\00";
static wchar_t const *c = L"\00";
return c ? 0 : b;
}
const char *h() { return g(); }
MSVC mangles the literal for 'b' as ??_C@_03NOLLCAOD@?$AA?$AA?$AA?$AA@
and the literal for 'c' as ??_C@_13NOLLCAOD@?$AA?$AA?$AA?$AA@
subtracting 'P' from 'NOLLCAOD' for each character and converting to hex yields
0xdebb20e3.
This appears to be a crc:
>>> hex(crcmod.mkCrcFun(0x104C11DB7, initCrc=0xffffffff, rev=True,
>>> xorOut=0)("\00\00\00\00"))
'0xdebb20e3L'
Here is my best bet for it's mangling:
<char-type> ::= 0 # char
::= 1 # wchar_t
::= ??? # char16_t/char32_t will need a mangling too...
<literal-length> ::= <non-negative integer> # the length of the literal
<encoded-crc> ::= <hex digit>+ @ # crc of the literal including null-terminator
<encoded-string> ::= <simple character> # uninteresting character
::= <hex digit> <hex digit> # these two nibbles encode the
byte for the character
<literal> ::= ?? _C @ _ <char-type> <literal-length> <encoded-crc>
<encoded-string>
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