diff options
Diffstat (limited to 'llvm/lib/MC/MCParser/AsmParser.cpp')
| -rw-r--r-- | llvm/lib/MC/MCParser/AsmParser.cpp | 27 |
1 files changed, 25 insertions, 2 deletions
diff --git a/llvm/lib/MC/MCParser/AsmParser.cpp b/llvm/lib/MC/MCParser/AsmParser.cpp index aac55351555..cf11ca9c5a8 100644 --- a/llvm/lib/MC/MCParser/AsmParser.cpp +++ b/llvm/lib/MC/MCParser/AsmParser.cpp @@ -2206,6 +2206,29 @@ bool GenericAsmParser::ParseDirectiveCFIOffset(StringRef, SMLoc DirectiveLoc) { return getStreamer().EmitCFIOffset(Register, Offset); } +static bool isValidEncoding(int64_t Encoding) { + if (Encoding & ~0xff) + return false; + + if (Encoding == dwarf::DW_EH_PE_omit) + return true; + + const unsigned Format = Encoding & 0xf; + if (Format != dwarf::DW_EH_PE_absptr && Format != dwarf::DW_EH_PE_udata2 && + Format != dwarf::DW_EH_PE_udata4 && Format != dwarf::DW_EH_PE_udata8 && + Format != dwarf::DW_EH_PE_sdata2 && Format != dwarf::DW_EH_PE_sdata4 && + Format != dwarf::DW_EH_PE_sdata8 && Format != dwarf::DW_EH_PE_signed) + return false; + + const unsigned Application = Encoding & 0xf0; + if (Application != dwarf::DW_EH_PE_absptr && + Application != dwarf::DW_EH_PE_pcrel && + Application != dwarf::DW_EH_PE_indirect) + return false; + + return true; +} + /// ParseDirectiveCFIPersonalityOrLsda /// ::= .cfi_personality encoding, [symbol_name] /// ::= .cfi_lsda encoding, [symbol_name] @@ -2214,10 +2237,10 @@ bool GenericAsmParser::ParseDirectiveCFIPersonalityOrLsda(StringRef IDVal, int64_t Encoding = 0; if (getParser().ParseAbsoluteExpression(Encoding)) return true; - if (Encoding == 255) + if (Encoding == dwarf::DW_EH_PE_omit) return false; - if (Encoding != 0) + if (!isValidEncoding(Encoding)) return TokError("unsupported encoding."); if (getLexer().isNot(AsmToken::Comma)) |
