Remove exception handling usage from tblgen.

Most places can use PrintFatalError as the unwinding mechanism was not
used for anything other than printing the error. The single exception
was CodeGenDAGPatterns.cpp, where intermediate errors during type
resolution were ignored to simplify incremental platform development.
This use is replaced by an error flag in TreePattern and bailout earlier
in various places if it is set. 

llvm-svn: 166712

1 files changed, 39 insertions, 49 deletions

diff --git a/llvm/lib/TableGen/Main.cpp b/llvm/lib/TableGen/Main.cpp
index d87d1755023..d0ca756016f 100644
--- a/llvm/lib/TableGen/Main.cpp
+++ b/llvm/lib/TableGen/Main.cpp
@@ -80,56 +80,46 @@ namespace llvm {
 int TableGenMain(char *argv0, TableGenMainFn *MainFn) {
   RecordKeeper Records;
 
-  try {
-    // Parse the input file.
-    OwningPtr<MemoryBuffer> File;
-    if (error_code ec =
-          MemoryBuffer::getFileOrSTDIN(InputFilename.c_str(), File)) {
-      errs() << "Could not open input file '" << InputFilename << "': "
-             << ec.message() <<"\n";
-      return 1;
-    }
-    MemoryBuffer *F = File.take();
-
-    // Tell SrcMgr about this buffer, which is what TGParser will pick up.
-    SrcMgr.AddNewSourceBuffer(F, SMLoc());
-
-    // Record the location of the include directory so that the lexer can find
-    // it later.
-    SrcMgr.setIncludeDirs(IncludeDirs);
-
-    TGParser Parser(SrcMgr, Records);
-
-    if (Parser.ParseFile())
-      return 1;
-
-    std::string Error;
-    tool_output_file Out(OutputFilename.c_str(), Error);
-    if (!Error.empty()) {
-      errs() << argv0 << ": error opening " << OutputFilename
-        << ":" << Error << "\n";
-      return 1;
-    }
-    if (!DependFilename.empty())
-      if (int Ret = createDependencyFile(Parser, argv0))
-        return Ret;
-
-    if (MainFn(Out.os(), Records))
-      return 1;
-
-    // Declare success.
-    Out.keep();
-    return 0;
-
-  } catch (const TGError &Error) {
-    PrintError(Error);
-  } catch (const std::string &Error) {
-    PrintError(Error);
-  } catch (const char *Error) {
-    PrintError(Error);
-  } catch (...) {
-    errs() << argv0 << ": Unknown unexpected exception occurred.\n";
+  // Parse the input file.
+  OwningPtr<MemoryBuffer> File;
+  if (error_code ec =
+        MemoryBuffer::getFileOrSTDIN(InputFilename.c_str(), File)) {
+    errs() << "Could not open input file '" << InputFilename << "': "
+           << ec.message() <<"\n";
+    return 1;
   }
+  MemoryBuffer *F = File.take();
+
+  // Tell SrcMgr about this buffer, which is what TGParser will pick up.
+  SrcMgr.AddNewSourceBuffer(F, SMLoc());
+
+  // Record the location of the include directory so that the lexer can find
+  // it later.
+  SrcMgr.setIncludeDirs(IncludeDirs);
+
+  TGParser Parser(SrcMgr, Records);
+
+  if (Parser.ParseFile())
+    return 1;
+
+  std::string Error;
+  tool_output_file Out(OutputFilename.c_str(), Error);
+  if (!Error.empty()) {
+    errs() << argv0 << ": error opening " << OutputFilename
+      << ":" << Error << "\n";
+    return 1;
+  }
+  if (!DependFilename.empty()) {
+    if (int Ret = createDependencyFile(Parser, argv0))
+      return Ret;
+  }
+
+  if (MainFn(Out.os(), Records))
+    return 1;
+
+  // Declare success.
+  Out.keep();
+  return 0;
 
   return 1;
 }