Revert "Use -fdebug-compilation-dir to form absolute paths in coverage mappings"

This reverts commit f6777964bde28c349d3e289ea37ecf5f5eeedbc4.

Because the absolute path check relies on temporary path containing
"clang", "test" and "CoverageMapping" as a subsequence, which is not
necessarily true on all systems(breaks internal integrates). Wanted to
fix it by checking for a leading "/" instead, but then noticed that it
would break windows tests, so leaving it to the author instead.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@374324 91177308-0d34-0410-b5e6-96231b3b80d8

Author: kadircet

lib/CodeGen/CoverageMappingGen.cpp

@@ -1278,6 +1278,13 @@ std::string getCoverageSection(const CodeGenModule &CGM) {
       CGM.getContext().getTargetInfo().getTriple().getObjectFormat());
 }
 
+std::string normalizeFilename(StringRef Filename) {
+  llvm::SmallString<256> Path(Filename);
+  llvm::sys::fs::make_absolute(Path);
+  llvm::sys::path::remove_dots(Path, /*remove_dot_dot=*/true);
+  return Path.str().str();
+}
+
 } // end anonymous namespace
 
 static void dump(llvm::raw_ostream &OS, StringRef FunctionName,
@@ -1310,24 +1317,6 @@ static void dump(llvm::raw_ostream &OS, StringRef FunctionName,
   }
 }
 
-CoverageMappingModuleGen::CoverageMappingModuleGen(
-    CodeGenModule &CGM, CoverageSourceInfo &SourceInfo)
-    : CGM(CGM), SourceInfo(SourceInfo), FunctionRecordTy(nullptr) {
-  // Honor -fdebug-compilation-dir in paths in coverage data. Otherwise, use the
-  // regular working directory when normalizing paths.
-  if (!CGM.getCodeGenOpts().DebugCompilationDir.empty())
-    CWD = CGM.getCodeGenOpts().DebugCompilationDir;
-  else
-    llvm::sys::fs::current_path(CWD);
-}
-
-std::string CoverageMappingModuleGen::normalizeFilename(StringRef Filename) {
-  llvm::SmallString<256> Path(Filename);
-  llvm::sys::fs::make_absolute(CWD, Path);
-  llvm::sys::path::remove_dots(Path, /*remove_dot_dot=*/true);
-  return Path.str().str();
-}
-
 void CoverageMappingModuleGen::addFunctionMappingRecord(
     llvm::GlobalVariable *NamePtr, StringRef NameValue, uint64_t FuncHash,
     const std::string &CoverageMapping, bool IsUsed) {

lib/CodeGen/CoverageMappingGen.h

@@ -54,14 +54,10 @@ class CoverageMappingModuleGen {
   std::vector<llvm::Constant *> FunctionNames;
   llvm::StructType *FunctionRecordTy;
   std::vector<std::string> CoverageMappings;
-  SmallString<256> CWD;
-
-  /// Make the filename absolute, remove dots, and normalize slashes to local
-  /// path style.
-  std::string normalizeFilename(StringRef Filename);
 
 public:
-  CoverageMappingModuleGen(CodeGenModule &CGM, CoverageSourceInfo &SourceInfo);
+  CoverageMappingModuleGen(CodeGenModule &CGM, CoverageSourceInfo &SourceInfo)
+      : CGM(CGM), SourceInfo(SourceInfo), FunctionRecordTy(nullptr) {}
 
   CoverageSourceInfo &getSourceInfo() const {
     return SourceInfo;