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Implement cfi_rel_offset

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@129306 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Rafael Espindola
2011-04-11 21:49:50 +00:00
parent 3f5bedf5cb
commit a61842bf6e
2 changed files with 82 additions and 1 deletions
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34
lib/MC/MCParser/AsmParser.cpp
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@ -80,6 +80,10 @@ private:
SourceMgr &SrcMgr;
MCAsmParserExtension *GenericParser;
MCAsmParserExtension *PlatformParser;
// FIXME: This is not the best place to store this. To handle a (for example)
// .cfi_rel_offset before a .cfi_def_cfa_offset we need to know the initial
// frame state.
int64_t LastOffset;
/// This is the current buffer index we're lexing from as managed by the
@ -145,6 +149,9 @@ public:
LastOffset += Adjustment;
return LastOffset;
}
int64_t getLastOffset() {
return LastOffset;
}
void setLastOffset(int64_t Offset) {
LastOffset = Offset;
}
@ -266,6 +273,8 @@ public:
".cfi_def_cfa_register");
AddDirectiveHandler<&GenericAsmParser::ParseDirectiveCFIOffset>(
".cfi_offset");
AddDirectiveHandler<&GenericAsmParser::ParseDirectiveCFIRelOffset>(
".cfi_rel_offset");
AddDirectiveHandler<
&GenericAsmParser::ParseDirectiveCFIPersonalityOrLsda>(".cfi_personality");
AddDirectiveHandler<
@ -301,6 +310,7 @@ public:
bool ParseDirectiveCFIAdjustCfaOffset(StringRef, SMLoc DirectiveLoc);
bool ParseDirectiveCFIDefCfaRegister(StringRef, SMLoc DirectiveLoc);
bool ParseDirectiveCFIOffset(StringRef, SMLoc DirectiveLoc);
bool ParseDirectiveCFIRelOffset(StringRef, SMLoc DirectiveLoc);
bool ParseDirectiveCFIPersonalityOrLsda(StringRef, SMLoc DirectiveLoc);
bool ParseDirectiveCFIRememberState(StringRef, SMLoc DirectiveLoc);
bool ParseDirectiveCFIRestoreState(StringRef, SMLoc DirectiveLoc);
@ -2351,7 +2361,7 @@ bool GenericAsmParser::ParseDirectiveCFIDefCfaRegister(StringRef,
}
/// ParseDirectiveCFIOffset
/// ::= .cfi_off register, offset
/// ::= .cfi_offset register, offset
bool GenericAsmParser::ParseDirectiveCFIOffset(StringRef, SMLoc DirectiveLoc) {
int64_t Register = 0;
int64_t Offset = 0;
@ -2369,6 +2379,28 @@ bool GenericAsmParser::ParseDirectiveCFIOffset(StringRef, SMLoc DirectiveLoc) {
return getStreamer().EmitCFIOffset(Register, Offset);
}
/// ParseDirectiveCFIRelOffset
/// ::= .cfi_rel_offset register, offset
bool GenericAsmParser::ParseDirectiveCFIRelOffset(StringRef,
SMLoc DirectiveLoc) {
int64_t Register = 0;
if (ParseRegisterOrRegisterNumber(Register, DirectiveLoc))
return true;
if (getLexer().isNot(AsmToken::Comma))
return TokError("unexpected token in directive");
Lex();
int64_t Offset = 0;
if (getParser().ParseAbsoluteExpression(Offset))
return true;
Offset -= getParser().getLastOffset();
return getStreamer().EmitCFIOffset(Register, Offset);
}
static bool isValidEncoding(int64_t Encoding) {
if (Encoding & ~0xff)
return false;