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, 3 insertions, 4 deletions

diff --git a/llvm/utils/TableGen/CodeGenInstruction.h b/llvm/utils/TableGen/CodeGenInstruction.h
index f601a8318f5..55d44399dff 100644
--- a/llvm/utils/TableGen/CodeGenInstruction.h
+++ b/llvm/utils/TableGen/CodeGenInstruction.h
@@ -152,7 +152,7 @@ namespace llvm {
 
     /// getOperandNamed - Return the index of the operand with the specified
     /// non-empty name.  If the instruction does not have an operand with the
-    /// specified name, throw an exception.
+    /// specified name, abort.
     unsigned getOperandNamed(StringRef Name) const;
 
     /// hasOperandNamed - Query whether the instruction has an operand of the
@@ -162,9 +162,8 @@ namespace llvm {
 
     /// ParseOperandName - Parse an operand name like "$foo" or "$foo.bar",
     /// where $foo is a whole operand and $foo.bar refers to a suboperand.
-    /// This throws an exception if the name is invalid.  If AllowWholeOp is
-    /// true, references to operands with suboperands are allowed, otherwise
-    /// not.
+    /// This aborts if the name is invalid.  If AllowWholeOp is true, references
+    /// to operands with suboperands are allowed, otherwise not.
     std::pair<unsigned,unsigned> ParseOperandName(const std::string &Op,
                                                   bool AllowWholeOp = true);