New TableGen backends for subtarget information. Only command line stuff

active now.  Scheduling itinerary next.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23869 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 111 insertions, 0 deletions

diff --git a/utils/TableGen/SubtargetEmitter.cpp b/utils/TableGen/SubtargetEmitter.cpp
new file mode 100644
index 0000000000..8af7166a3d
--- /dev/null
+++ b/utils/TableGen/SubtargetEmitter.cpp
@@ -0,0 +1,111 @@
+//===- SubtargetEmitter.cpp - Generate subtarget enumerations -------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file was developed by James M. Laskey and is distributed under
+// the University of Illinois Open Source License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This tablegen backend emits subtarget enumerations.
+//
+//===----------------------------------------------------------------------===//
+
+#include "SubtargetEmitter.h"
+#include "CodeGenTarget.h"
+#include "Record.h"
+#include "llvm/ADT/StringExtras.h"
+#include "llvm/Support/Debug.h"
+#include <algorithm>
+#include <set>
+using namespace llvm;
+
+// Convenience types
+typedef std::vector<Record*> RecordList;
+typedef std::vector<Record*>::iterator RecordListIter;
+
+
+// SubtargetEmitter::run - Main subtarget enumeration emitter.
+//
+void SubtargetEmitter::run(std::ostream &OS) {
+  EmitSourceFileHeader("Subtarget Enumeration Source Fragment", OS);
+  RecordList Features = Records.getAllDerivedDefinitions("SubtargetFeature");
+  RecordList Processors = Records.getAllDerivedDefinitions("Processor");
+
+  OS << "namespace llvm {\n\n";
+  
+  { // Feature enumeration
+    int i = 0;
+    
+    OS << "enum {\n";
+    
+    for (RecordListIter RI = Features.begin(), E = Features.end(); RI != E;){
+      Record *R = *RI++;
+      std::string Instance = R->getName();
+      OS << "  "
+         << Instance
+         << " = "
+         << " 1 << " << i++
+         << ((RI != E) ? ",\n" : "\n");
+    }
+    
+    OS << "};\n";
+  }
+  
+  { // Feature key values
+    OS << "\n\n"
+       << "/// Sorted (by key) array of values for CPU features.\n"
+       << "static SubtargetFeatureKV FeatureKV[] = {\n";
+    for (RecordListIter RI = Features.begin(), E = Features.end(); RI != E;) {
+      Record *R = *RI++;
+      std::string Instance = R->getName();
+      std::string Name = R->getValueAsString("Name");
+      std::string Desc = R->getValueAsString("Desc");
+      OS << "  { "
+         << "\"" << Name << "\", "
+         << "\"" << Desc << "\", "
+         << Instance
+         << ((RI != E) ? " },\n" : " }\n");
+    }
+    OS << "};\n";
+  }
+  
+  { // Feature key values
+    OS << "\n\n"
+       << "/// Sorted (by key) array of values for CPU subtype.\n"
+       << "static const SubtargetFeatureKV SubTypeKV[] = {\n";
+    for (RecordListIter RI = Processors.begin(), E = Processors.end();
+         RI != E;) {
+      Record *R = *RI++;
+      std::string Name = R->getValueAsString("Name");
+      Record *ProcItin = R->getValueAsDef("ProcItin");
+      ListInit *Features = R->getValueAsListInit("Features");
+      unsigned N = Features->getSize();
+      OS << "  { "
+         << "\"" << Name << "\", "
+         << "\"Select the " << Name << " processor\", ";
+         
+      
+      if (N == 0) {
+        OS << "0";
+      } else {
+        for (unsigned i = 0; i < N; ) {
+          if (DefInit *DI = dynamic_cast<DefInit*>(Features->getElement(i++))) {
+            Record *Feature = DI->getDef();
+            std::string Name = Feature->getName();
+            OS << Name;
+            if (i != N) OS << " | ";
+          } else {
+            throw "Feature: " + Name +
+                  " expected feature in processor feature list!";
+          }
+        }
+      }
+      
+      OS << ((RI != E) ? " },\n" : " }\n");
+    }
+    OS << "};\n";
+  }
+
+  OS << "\n} // End llvm namespace \n";
+}