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Add support for expressions in .sleb/.uleb directives.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@118023 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Rafael Espindola
2010-11-02 17:22:24 +00:00
parent 8bc9ef77b7
commit 3ff57094a7
12 changed files with 236 additions and 95 deletions
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40
lib/MC/MCParser/AsmParser.cpp
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@ -261,8 +261,6 @@ public:
bool ParseDirectiveMacro(StringRef, SMLoc DirectiveLoc);
bool ParseDirectiveEndMacro(StringRef, SMLoc DirectiveLoc);
void ParseUleb128(uint64_t Value);
void ParseSleb128(int64_t Value);
bool ParseDirectiveLEB128(StringRef, SMLoc);
};
@ -2178,44 +2176,22 @@ bool GenericAsmParser::ParseDirectiveEndMacro(StringRef Directive,
"no current macro definition");
}
void GenericAsmParser::ParseUleb128(uint64_t Value) {
const uint64_t Mask = (1 << 7) - 1;
do {
unsigned Byte = Value & Mask;
Value >>= 7;
if (Value) // Not the last one
Byte |= (1 << 7);
getStreamer().EmitIntValue(Byte, 1, DEFAULT_ADDRSPACE);
} while (Value);
}
void GenericAsmParser::ParseSleb128(int64_t Value) {
const int64_t Mask = (1 << 7) - 1;
for(;;) {
unsigned Byte = Value & Mask;
Value >>= 7;
bool Done = ((Value == 0 && (Byte & 0x40) == 0) ||
(Value == -1 && (Byte & 0x40) != 0));
if (!Done)
Byte |= (1 << 7);
getStreamer().EmitIntValue(Byte, 1, DEFAULT_ADDRSPACE);
if (Done)
break;
}
}
bool GenericAsmParser::ParseDirectiveLEB128(StringRef DirName, SMLoc) {
int64_t Value;
if (getParser().ParseAbsoluteExpression(Value))
getParser().CheckForValidSection();
const MCExpr *Value;
if (getParser().ParseExpression(Value))
return true;
if (getLexer().isNot(AsmToken::EndOfStatement))
return TokError("unexpected token in directive");
if (DirName[1] == 's')
ParseSleb128(Value);
getStreamer().EmitSLEB128Value(Value);
else
ParseUleb128(Value);
getStreamer().EmitULEB128Value(Value);
return false;
}