Implement cfi_rel_offset
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@129306 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/MC/MCParser/AsmParser.cpp b/lib/MC/MCParser/AsmParser.cpp
index 5eb772e..8af4ac6 100644
--- a/lib/MC/MCParser/AsmParser.cpp
+++ b/lib/MC/MCParser/AsmParser.cpp
@@ -80,6 +80,10 @@
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 @@
LastOffset += Adjustment;
return LastOffset;
}
+ int64_t getLastOffset() {
+ return LastOffset;
+ }
void setLastOffset(int64_t Offset) {
LastOffset = Offset;
}
@@ -266,6 +273,8 @@
".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 @@
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 @@
}
/// 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 @@
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;