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AsmParser: Add support for the .purgem directive.

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Based on a patch by Team PaX.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@156709 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Benjamin Kramer 2012-05-12 11:21:46 +00:00
parent 5cdf0add9e
commit bc3b27ccd9
2 changed files with 35 additions and 0 deletions
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23
lib/MC/MCParser/AsmParser.cpp
View File

@ -336,6 +336,7 @@ public:
AddDirectiveHandler<&GenericAsmParser::ParseDirectiveMacro>(".macro");
AddDirectiveHandler<&GenericAsmParser::ParseDirectiveEndMacro>(".endm");
AddDirectiveHandler<&GenericAsmParser::ParseDirectiveEndMacro>(".endmacro");
AddDirectiveHandler<&GenericAsmParser::ParseDirectivePurgeMacro>(".purgem");
AddDirectiveHandler<&GenericAsmParser::ParseDirectiveLEB128>(".sleb128");
AddDirectiveHandler<&GenericAsmParser::ParseDirectiveLEB128>(".uleb128");
@ -367,6 +368,7 @@ public:
bool ParseDirectiveMacrosOnOff(StringRef, SMLoc DirectiveLoc);
bool ParseDirectiveMacro(StringRef, SMLoc DirectiveLoc);
bool ParseDirectiveEndMacro(StringRef, SMLoc DirectiveLoc);
bool ParseDirectivePurgeMacro(StringRef, SMLoc DirectiveLoc);
bool ParseDirectiveLEB128(StringRef, SMLoc);
};
@ -3083,6 +3085,27 @@ bool GenericAsmParser::ParseDirectiveEndMacro(StringRef Directive,
"no current macro definition");
}
/// ParseDirectivePurgeMacro
/// ::= .purgem
bool GenericAsmParser::ParseDirectivePurgeMacro(StringRef Directive,
SMLoc DirectiveLoc) {
StringRef Name;
if (getParser().ParseIdentifier(Name))
return TokError("expected identifier in '.purgem' directive");
if (getLexer().isNot(AsmToken::EndOfStatement))
return TokError("unexpected token in '.purgem' directive");
StringMap<Macro*>::iterator I = getParser().MacroMap.find(Name);
if (I == getParser().MacroMap.end())
return Error(DirectiveLoc, "macro '" + Name + "' is not defined");
// Undefine the macro.
delete I->getValue();
getParser().MacroMap.erase(I);
return false;
}
bool GenericAsmParser::ParseDirectiveLEB128(StringRef DirName, SMLoc) {
getParser().CheckForValidSection();

12
test/MC/AsmParser/purgem.s Normal file
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@ -0,0 +1,12 @@
# RUN: not llvm-mc -triple i386-unknown-unknown %s |& FileCheck %s
.macro foo
.err
.endm
.purgem bar
# CHECK: error: macro 'bar' is not defined
.purgem foo
foo
# CHECK: error: invalid instruction mnemonic 'foo'