Initial commit of the 'landingpad' instruction.

This implements the 'landingpad' instruction. It's used to indicate that a basic
block is a landing pad. There are several restrictions on its use (see
LangRef.html for more detail). These restrictions allow the exception handling
code to gather the information it needs in a much more sane way.

This patch has the definition, implementation, C interface, parsing, and bitcode
support in it.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@137501 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 42 insertions, 0 deletions

diff --git a/lib/AsmParser/LLParser.cpp b/lib/AsmParser/LLParser.cpp
index 8b30eef3d5..6a4c2a8fb9 100644
--- a/lib/AsmParser/LLParser.cpp
+++ b/lib/AsmParser/LLParser.cpp
@@ -2945,6 +2945,7 @@ int LLParser::ParseInstruction(Instruction *&Inst, BasicBlock *BB,
   case lltok::kw_insertelement:  return ParseInsertElement(Inst, PFS);
   case lltok::kw_shufflevector:  return ParseShuffleVector(Inst, PFS);
   case lltok::kw_phi:            return ParsePHI(Inst, PFS);
+  case lltok::kw_landingpad:     return ParseLandingPad(Inst, PFS);
   case lltok::kw_call:           return ParseCall(Inst, PFS, false);
   case lltok::kw_tail:           return ParseCall(Inst, PFS, true);
   // Memory.
@@ -3519,6 +3520,47 @@ int LLParser::ParsePHI(Instruction *&Inst, PerFunctionState &PFS) {
   return AteExtraComma ? InstExtraComma : InstNormal;
 }
 
+/// ParseLandingPad
+///   ::= 'landingpad' Type 'personality' TypeAndValue 'cleanup'? Clause+
+/// Clause
+///   ::= 'catch' TypeAndValue
+///   ::= 'filter'
+///   ::= 'filter' TypeAndValue ( ',' TypeAndValue )*
+bool LLParser::ParseLandingPad(Instruction *&Inst, PerFunctionState &PFS) {
+  Type *Ty = 0; LocTy TyLoc;
+  Value *PersFn; LocTy PersFnLoc;
+  LocTy LPLoc = Lex.getLoc();
+
+  if (ParseType(Ty, TyLoc) ||
+      ParseToken(lltok::kw_personality, "expected 'personality'") ||
+      ParseTypeAndValue(PersFn, PersFnLoc, PFS))
+    return true;
+
+  LandingPadInst *LP = LandingPadInst::Create(Ty, PersFn, 0);
+  LP->setCleanup(EatIfPresent(lltok::kw_cleanup));
+
+  while (Lex.getKind() == lltok::kw_catch || Lex.getKind() == lltok::kw_filter){
+    LandingPadInst::ClauseType CT;
+    if (EatIfPresent(lltok::kw_catch))
+      CT = LandingPadInst::Catch;
+    else if (EatIfPresent(lltok::kw_filter))
+      CT = LandingPadInst::Filter;
+    else
+      return TokError("expected 'catch' or 'filter' clause type");
+
+    Value *V; LocTy VLoc;
+    if (ParseTypeAndValue(V, VLoc, PFS)) {
+      delete LP;
+      return true;
+    }
+
+    LP->addClause(V);
+  }
+
+  Inst = LP;
+  return false;
+}
+
 /// ParseCall
 ///   ::= 'tail'? 'call' OptionalCallingConv OptionalAttrs Type Value
 ///       ParameterList OptionalAttrs