Initial checkin of Instruction emitter, which just produces enum values so far

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7515 91177308-0d34-0410-b5e6-96231b3b80d8

2 files changed, 91 insertions, 0 deletions

diff --git a/support/tools/TableGen/InstrInfoEmitter.cpp b/support/tools/TableGen/InstrInfoEmitter.cpp
new file mode 100644
index 0000000000..cc2d74fa8d
--- /dev/null
+++ b/support/tools/TableGen/InstrInfoEmitter.cpp
@@ -0,0 +1,65 @@
+//===- 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 "InstrInfoEmitter.h"
+#include "Record.h"
+
+static void EmitSourceHeader(const std::string &Desc, std::ostream &o) {
+  o << "//===- TableGen'erated file -------------------------------------*-"
+       " C++ -*-===//\n//\n// " << Desc << "\n//\n// Automatically generate"
+       "d file, do not edit!\n//\n//===------------------------------------"
+       "----------------------------------===//\n\n";
+}
+
+static std::string getQualifiedName(Record *R) {
+  std::string Namespace = R->getValueAsString("Namespace");
+  if (Namespace.empty()) return R->getName();
+  return Namespace + "::" + R->getName();
+}
+
+static Record *getTarget(RecordKeeper &RC) {
+  std::vector<Record*> Targets = RC.getAllDerivedDefinitions("Target");
+
+  if (Targets.size() != 1)
+    throw std::string("ERROR: Multiple subclasses of Target defined!");
+  return Targets[0];
+}
+
+// runEnums - Print out enum values for all of the instructions.
+void InstrInfoEmitter::runEnums(std::ostream &OS) {
+  std::vector<Record*> Insts = Records.getAllDerivedDefinitions("Instruction");
+
+  if (Insts.size() == 0)
+    throw std::string("No 'Instruction' subclasses defined!");
+
+  std::string Namespace = Insts[0]->getValueAsString("Namespace");
+
+  EmitSourceHeader("Target Instruction Enum Values", OS);
+
+  if (!Namespace.empty())
+    OS << "namespace " << Namespace << " {\n";
+  OS << "  enum {\n";
+
+  // We must emit the PHI and NOOP opcodes first...
+  Record *Target = getTarget(Records);
+  Record *InstrInfo = Target->getValueAsDef("InstructionSet");
+
+  Record *PHI = InstrInfo->getValueAsDef("PHIInst");
+  Record *NOOP = InstrInfo->getValueAsDef("NOOPInst");
+
+  OS << "    " << PHI->getName() << ", \t// 0 (fixed for all targets)\n"
+     << "    " << NOOP->getName() << ", \t// 1 (fixed for all targets)\n";
+  
+  // Print out the rest of the instructions now...
+  for (unsigned i = 0, e = Insts.size(); i != e; ++i)
+    if (Insts[i] != PHI && Insts[i] != NOOP)
+      OS << "    " << Insts[i]->getName() << ", \t// " << i+2 << "\n";
+  
+  OS << "  };\n";
+  if (!Namespace.empty())
+    OS << "}\n";
+}
diff --git a/support/tools/TableGen/InstrInfoEmitter.h b/support/tools/TableGen/InstrInfoEmitter.h
new file mode 100644
index 0000000000..bf7e6758a5
--- /dev/null
+++ b/support/tools/TableGen/InstrInfoEmitter.h
@@ -0,0 +1,26 @@
+//===- InstrInfoEmitter.h - Generate a Instruction Set Desc. ----*- C++ -*-===//
+//
+// This tablegen backend is responsible for emitting a description of the target
+// instruction set for the code generator.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef INSTRINFO_EMITTER_H
+#define INSTRINFO_EMITTER_H
+
+#include <iosfwd>
+class RecordKeeper;
+
+class InstrInfoEmitter {
+  RecordKeeper &Records;
+public:
+  InstrInfoEmitter(RecordKeeper &R) : Records(R) {}
+  
+  // run - Output the instruction set description, returning true on failure.
+  void run(std::ostream &o);
+
+  // runEnums - Print out enum values for all of the instructions.
+  void runEnums(std::ostream &o);
+};
+
+#endif