Implement .cfi_undefined. Based on a patch from PaX team, updated by
Roman Divacky. I just added the testcase.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@168520 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/MC/MCParser/AsmParser.cpp b/lib/MC/MCParser/AsmParser.cpp
index 6f2e85e..34ebe3b 100644
--- a/lib/MC/MCParser/AsmParser.cpp
+++ b/lib/MC/MCParser/AsmParser.cpp
@@ -396,6 +396,8 @@
&GenericAsmParser::ParseDirectiveCFIEscape>(".cfi_escape");
AddDirectiveHandler<
&GenericAsmParser::ParseDirectiveCFISignalFrame>(".cfi_signal_frame");
+ AddDirectiveHandler<
+ &GenericAsmParser::ParseDirectiveCFIUndefined>(".cfi_undefined");
// Macro directives.
AddDirectiveHandler<&GenericAsmParser::ParseDirectiveMacrosOnOff>(
@@ -433,6 +435,7 @@
bool ParseDirectiveCFIRestore(StringRef, SMLoc DirectiveLoc);
bool ParseDirectiveCFIEscape(StringRef, SMLoc DirectiveLoc);
bool ParseDirectiveCFISignalFrame(StringRef, SMLoc DirectiveLoc);
+ bool ParseDirectiveCFIUndefined(StringRef, SMLoc DirectiveLoc);
bool ParseDirectiveMacrosOnOff(StringRef, SMLoc DirectiveLoc);
bool ParseDirectiveMacro(StringRef, SMLoc DirectiveLoc);
@@ -3246,6 +3249,20 @@
return false;
}
+/// ParseDirectiveCFIUndefined
+/// ::= .cfi_undefined register
+bool GenericAsmParser::ParseDirectiveCFIUndefined(StringRef Directive,
+ SMLoc DirectiveLoc) {
+ int64_t Register = 0;
+
+ if (ParseRegisterOrRegisterNumber(Register, DirectiveLoc))
+ return true;
+
+ getStreamer().EmitCFIUndefined(Register);
+
+ return false;
+}
+
/// ParseDirectiveMacrosOnOff
/// ::= .macros_on
/// ::= .macros_off