+//===- InstrInfoEmitter.cpp - Generate a Instruction Set Desc. ------------===//
+//
+// This tablegen backend is responsible for emitting a description of the target
+// instruction set for the code generator.
+//
+//===----------------------------------------------------------------------===//
+
+#include "InstrSelectorEmitter.h"
+#include "Record.h"
+
+NodeType::ArgResultTypes NodeType::Translate(Record *R) {
+ const std::string &Name = R->getName();
+ if (Name == "DNRT_void") return Void;
+ if (Name == "DNRT_val" || Name == "DNAT_val") return Val;
+ if (Name == "DNRT_arg0" || Name == "DNAT_arg0") return Arg0;
+ if (Name == "DNAT_ptr") return Ptr;
+ throw "Unknown DagNodeResult Type '" + Name + "'!";
+}
+
+
+/// ProcessNodeTypes - Process all of the node types in the current
+/// RecordKeeper, turning them into the more accessible NodeTypes data
+/// structure.
+///
+void InstrSelectorEmitter::ProcessNodeTypes() {
+ std::vector<Record*> Nodes = Records.getAllDerivedDefinitions("DagNode");
+
+ for (unsigned i = 0, e = Nodes.size(); i != e; ++i) {
+ Record *Node = Nodes[i];
+
+ // Translate the return type...
+ NodeType::ArgResultTypes RetTy =
+ NodeType::Translate(Node->getValueAsDef("RetType"));
+
+ // Translate the arguments...
+ ListInit *Args = Node->getValueAsListInit("ArgTypes");
+ std::vector<NodeType::ArgResultTypes> ArgTypes;
+
+ for (unsigned a = 0, e = Args->getSize(); a != e; ++a)
+ if (DefInit *DI = dynamic_cast<DefInit*>(Args->getElement(a)))
+ ArgTypes.push_back(NodeType::Translate(DI->getDef()));
+ else
+ throw "In node " + Node->getName() + ", argument is not a Def!";
+
+ // Add the node type mapping now...
+ NodeTypes[Node] = NodeType(RetTy, ArgTypes);
+ }
+}
+
+void InstrSelectorEmitter::run(std::ostream &OS) {
+ // Type-check all of the node types to ensure we "understand" them.
+ ProcessNodeTypes();
+
+
+
+}