Add LLVMGetAttrKindID in the C API in order to facilitate migration away from LLVMAttribute

Summary:
LLVMAttribute has outlived its utility and is becoming a problem for C API users that what to use all the LLVM attributes. In order to help moving away from LLVMAttribute in a smooth manner, this diff introduce LLVMGetAttrKindIDInContext, which can be used instead of the enum values.

See D18749 for reference.

Reviewers: Wallbraker, whitequark, joker.eph, echristo, rafael

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D19081

llvm-svn: 266842

1 files changed, 23 insertions, 0 deletions

diff --git a/llvm/utils/TableGen/Attributes.cpp b/llvm/utils/TableGen/Attributes.cpp
index 7b001bf..58dbe57 100644
--- a/llvm/utils/TableGen/Attributes.cpp
+++ b/llvm/utils/TableGen/Attributes.cpp
@@ -27,6 +27,7 @@ public:
 
 private:
   void emitTargetIndependentEnums(raw_ostream &OS);
+  void emitConversionFn(raw_ostream &OS);
   void emitFnAttrCompatCheck(raw_ostream &OS, bool IsStringAttr);
 
   void printEnumAttrClasses(raw_ostream &OS,
@@ -52,6 +53,27 @@ void Attributes::emitTargetIndependentEnums(raw_ostream &OS) {
   OS << "#endif\n";
 }
 
+void Attributes::emitConversionFn(raw_ostream &OS) {
+  OS << "#ifdef GET_ATTR_KIND_FROM_NAME\n";
+  OS << "#undef GET_ATTR_KIND_FROM_NAME\n";
+
+  std::vector<Record*> Attrs =
+      Records.getAllDerivedDefinitions("EnumAttr");
+
+  OS << "static Attribute::AttrKind getAttrKindFromName(StringRef AttrName) {\n";
+  OS << "  return StringSwitch<Attribute::AttrKind>(AttrName)\n";
+
+  for (auto A : Attrs) {
+    OS << "    .Case(\"" << A->getValueAsString("AttrString");
+    OS << "\", Attribute::" << A->getName() << ")\n";
+  }
+
+  OS << "    .Default(Attribute::None);\n";
+  OS << "}\n\n";
+
+  OS << "#endif\n";
+}
+
 void Attributes::emitFnAttrCompatCheck(raw_ostream &OS, bool IsStringAttr) {
   OS << "#ifdef GET_ATTR_COMPAT_FUNC\n";
   OS << "#undef GET_ATTR_COMPAT_FUNC\n";
@@ -144,6 +166,7 @@ void Attributes::printStrBoolAttrClasses(raw_ostream &OS,
 
 void Attributes::emit(raw_ostream &OS) {
   emitTargetIndependentEnums(OS);
+  emitConversionFn(OS);
   emitFnAttrCompatCheck(OS, false);
 }