Initial checkin of useful wrappers around the Target classes, for now, only ValueType and

Target are wrapped

llvm-svn: 7665

1 files changed, 66 insertions, 0 deletions

diff --git a/llvm/support/tools/TableGen/CodeGenWrappers.cpp b/llvm/support/tools/TableGen/CodeGenWrappers.cpp
new file mode 100644
index 00000000000..4987aeb76c1
--- /dev/null
+++ b/llvm/support/tools/TableGen/CodeGenWrappers.cpp
@@ -0,0 +1,66 @@
+//===- CodeGenWrappers.cpp - Code Generation Class Wrappers -----*- C++ -*-===//
+//
+// These classes wrap target description classes used by the various code
+// generation TableGen backends.  This makes it easier to access the data and
+// provides a single place that needs to check it for validity.  All of these
+// classes throw exceptions on error conditions.
+//
+//===----------------------------------------------------------------------===//
+
+#include "CodeGenWrappers.h"
+#include "Record.h"
+
+/// getValueType - Return the MCV::ValueType that the specified TableGen record
+/// corresponds to.
+MVT::ValueType getValueType(Record *Rec) {
+  return (MVT::ValueType)Rec->getValueAsInt("Value");
+}
+
+std::ostream &operator<<(std::ostream &OS, MVT::ValueType T) {
+  switch (T) {
+  case MVT::Other: return OS << "UNKNOWN";
+  case MVT::i1:    return OS << "i1";
+  case MVT::i8:    return OS << "i8";
+  case MVT::i16:   return OS << "i16";
+  case MVT::i32:   return OS << "i32";
+  case MVT::i64:   return OS << "i64";
+  case MVT::i128:  return OS << "i128";
+  case MVT::f32:   return OS << "f32";
+  case MVT::f64:   return OS << "f64";
+  case MVT::f80:   return OS << "f80";
+  case MVT::f128:  return OS << "f128";
+  case MVT::isVoid:return OS << "void";
+  }
+  return OS;
+}
+
+
+
+/// getTarget - Return the current instance of the Target class.
+///
+CodeGenTarget::CodeGenTarget() {
+  std::vector<Record*> Targets = Records.getAllDerivedDefinitions("Target");
+  if (Targets.size() != 1)
+    throw std::string("ERROR: Multiple subclasses of Target defined!");
+  TargetRec = Targets[0];
+
+  // Read in all of the CalleeSavedRegisters...
+  ListInit *LI = TargetRec->getValueAsListInit("CalleeSavedRegisters");
+  for (unsigned i = 0, e = LI->getSize(); i != e; ++i)
+    if (DefInit *DI = dynamic_cast<DefInit*>(LI->getElement(i)))
+      CalleeSavedRegisters.push_back(DI->getDef());
+    else
+      throw "Target: " + TargetRec->getName() +
+            " expected register definition in CalleeSavedRegisters list!";
+
+  PointerType = getValueType(TargetRec->getValueAsDef("PointerType"));
+}
+
+
+const std::string &CodeGenTarget::getName() const {
+  return TargetRec->getName();
+}
+
+Record *CodeGenTarget::getInstructionSet() const {
+  return TargetRec->getValueAsDef("InstructionSet");
+}