[codeview] Add .cv_string directive for testing purposes

The main use case for this directive is to allow assembly writers to
write their own FPO data strings without going through the .cv_fpo*
directive family.

I'm experimenting with different RPN programs to fix PR38857, and I
figured I should go ahead and make this directive permanent.

llvm-svn: 341712

1 files changed, 20 insertions, 1 deletions

diff --git a/llvm/lib/MC/MCParser/AsmParser.cpp b/llvm/lib/MC/MCParser/AsmParser.cpp
index 38b6171ede9..fd226eac4cd 100644
--- a/llvm/lib/MC/MCParser/AsmParser.cpp
+++ b/llvm/lib/MC/MCParser/AsmParser.cpp
@@ -467,6 +467,7 @@ private:
     DK_CV_INLINE_LINETABLE,
     DK_CV_DEF_RANGE,
     DK_CV_STRINGTABLE,
+    DK_CV_STRING,
     DK_CV_FILECHECKSUMS,
     DK_CV_FILECHECKSUM_OFFSET,
     DK_CV_FPO_DATA,
@@ -538,7 +539,7 @@ private:
   bool parseDirectiveStabs();
 
   // ".cv_file", ".cv_func_id", ".cv_inline_site_id", ".cv_loc", ".cv_linetable",
-  // ".cv_inline_linetable", ".cv_def_range"
+  // ".cv_inline_linetable", ".cv_def_range", ".cv_string"
   bool parseDirectiveCVFile();
   bool parseDirectiveCVFuncId();
   bool parseDirectiveCVInlineSiteId();
@@ -546,6 +547,7 @@ private:
   bool parseDirectiveCVLinetable();
   bool parseDirectiveCVInlineLinetable();
   bool parseDirectiveCVDefRange();
+  bool parseDirectiveCVString();
   bool parseDirectiveCVStringTable();
   bool parseDirectiveCVFileChecksums();
   bool parseDirectiveCVFileChecksumOffset();
@@ -2029,6 +2031,8 @@ bool AsmParser::parseStatement(ParseStatementInfo &Info,
       return parseDirectiveCVInlineLinetable();
     case DK_CV_DEF_RANGE:
       return parseDirectiveCVDefRange();
+    case DK_CV_STRING:
+      return parseDirectiveCVString();
     case DK_CV_STRINGTABLE:
       return parseDirectiveCVStringTable();
     case DK_CV_FILECHECKSUMS:
@@ -3813,6 +3817,20 @@ bool AsmParser::parseDirectiveCVDefRange() {
   return false;
 }
 
+/// parseDirectiveCVString
+/// ::= .cv_stringtable "string"
+bool AsmParser::parseDirectiveCVString() {
+  std::string Data;
+  if (checkForValidSection() || parseEscapedString(Data))
+    return addErrorSuffix(" in '.cv_string' directive");
+
+  // Put the string in the table and emit the offset.
+  std::pair<StringRef, unsigned> Insertion =
+      getCVContext().addToStringTable(Data);
+  getStreamer().EmitIntValue(Insertion.second, 4);
+  return false;
+}
+
 /// parseDirectiveCVStringTable
 /// ::= .cv_stringtable
 bool AsmParser::parseDirectiveCVStringTable() {
@@ -5238,6 +5256,7 @@ void AsmParser::initializeDirectiveKindMap() {
   DirectiveKindMap[".cv_inline_linetable"] = DK_CV_INLINE_LINETABLE;
   DirectiveKindMap[".cv_inline_site_id"] = DK_CV_INLINE_SITE_ID;
   DirectiveKindMap[".cv_def_range"] = DK_CV_DEF_RANGE;
+  DirectiveKindMap[".cv_string"] = DK_CV_STRING;
   DirectiveKindMap[".cv_stringtable"] = DK_CV_STRINGTABLE;
   DirectiveKindMap[".cv_filechecksums"] = DK_CV_FILECHECKSUMS;
   DirectiveKindMap[".cv_filechecksumoffset"] = DK_CV_FILECHECKSUM_OFFSET;