Initial Commit of llvm2cpp

This is a safekeeping commit. The program is not finished. It currently
handles modules, types, global variables and function declarations. Blocks
and instructions remain to be done.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28528 91177308-0d34-0410-b5e6-96231b3b80d8

tools/llvm2cpp/CppWriter.h

@@ -0,0 +1,18 @@
+//===--- CppWriter.h - Generate C++ IR to C++ Source Interface ------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file was developed by Reid Spencer and is distributed under the
+// University of Illinois Open Source License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file declares a function, WriteModuleToCppFile that will convert a 
+// Module into the corresponding C++ code to construct the same module.
+//
+//===------------------------------------------------------------------------===
+#include <ostream>
+namespace llvm {
+class Module;
+void WriteModuleToCppFile(Module* mod, std::ostream& out);
+}

tools/llvm2cpp/Makefile

@@ -0,0 +1,23 @@
+##===- tools/llvm-as/Makefile ------------------------------*- Makefile -*-===##
+# 
+#                     The LLVM Compiler Infrastructure
+#
+# This file was developed by the LLVM research group and is distributed under
+# the University of Illinois Open Source License. See LICENSE.TXT for details.
+# 
+##===----------------------------------------------------------------------===##
+LEVEL = ../..
+TOOLNAME = llvm2cpp
+USEDLIBS = LLVMAsmParser LLVMBCWriter LLVMCore \
+           LLVMSupport.a LLVMbzip2 LLVMSystem.a
+
+include $(LEVEL)/Makefile.common
+
+tryit: all-local recurty.cpp globalvars.cpp
+
+%.cpp : %.ll
+	llvm2cpp $*.ll -f -o $*.cpp
+	gcc -I$(LLVM_SRC_ROOT)/include -I$(LLVM_OBJ_ROOT)/include -g \
+	-D__STDC_LIMIT_MACROS -L$(LibDir) $(LibDir)/LLVMCore.o -lLLVMSupport \
+	$(LibDir)/LLVMbzip2.o -lLLVMSystem -lstdc++ \
+	$*.cpp -o $*

tools/llvm2cpp/llvm2cpp.cpp

@@ -0,0 +1,138 @@
+//===--- llvm-as.cpp - The low-level LLVM assembler -----------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file was developed by the LLVM research group and is distributed under
+// the University of Illinois Open Source License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+//  This utility may be invoked in the following manner:
+//   llvm-as --help         - Output information about command line switches
+//   llvm-as [options]      - Read LLVM asm from stdin, write bytecode to stdout
+//   llvm-as [options] x.ll - Read LLVM asm from the x.ll file, write bytecode
+//                            to the x.bc file.
+//
+//===------------------------------------------------------------------------===
+
+#include "llvm/Module.h"
+#include "llvm/Assembly/Parser.h"
+#include "llvm/Bytecode/Writer.h"
+#include "llvm/Analysis/Verifier.h"
+#include "llvm/Support/CommandLine.h"
+#include "llvm/Support/SystemUtils.h"
+#include "llvm/System/Signals.h"
+#include "CppWriter.h"
+#include <fstream>
+#include <iostream>
+#include <memory>
+
+using namespace llvm;
+
+static cl::opt<std::string>
+InputFilename(cl::Positional, cl::desc("<input LLVM assembly file>"), 
+  cl::init("-"));
+
+static cl::opt<std::string>
+OutputFilename("o", cl::desc("Override output filename"),
+               cl::value_desc("filename"));
+
+static cl::opt<bool>
+Force("f", cl::desc("Overwrite output files"));
+
+static cl::opt<bool>
+DisableVerify("disable-verify", cl::Hidden,
+              cl::desc("Do not run verifier on input LLVM (dangerous!)"));
+
+int main(int argc, char **argv) {
+  cl::ParseCommandLineOptions(argc, argv, " llvm .ll -> .cpp assembler\n");
+  sys::PrintStackTraceOnErrorSignal();
+
+  int exitCode = 0;
+  std::ostream *Out = 0;
+  try {
+    // Parse the file now...
+    std::auto_ptr<Module> M(ParseAssemblyFile(InputFilename));
+    if (M.get() == 0) {
+      std::cerr << argv[0] << ": assembly didn't read correctly.\n";
+      return 1;
+    }
+
+    try {
+      if (!DisableVerify)
+        verifyModule(*M.get(), ThrowExceptionAction);
+    } catch (const std::string &Err) {
+      std::cerr << argv[0]
+                << ": assembly parsed, but does not verify as correct!\n";
+      std::cerr << Err;
+      return 1;
+    }
+
+    if (OutputFilename != "") {   // Specified an output filename?
+      if (OutputFilename != "-") {  // Not stdout?
+        if (!Force && std::ifstream(OutputFilename.c_str())) {
+          // If force is not specified, make sure not to overwrite a file!
+          std::cerr << argv[0] << ": error opening '" << OutputFilename
+                    << "': file exists!\n"
+                    << "Use -f command line argument to force output\n";
+          return 1;
+        }
+        Out = new std::ofstream(OutputFilename.c_str(), std::ios::out |
+                                std::ios::trunc | std::ios::binary);
+      } else {                      // Specified stdout
+        // FIXME: cout is not binary!
+        Out = &std::cout;
+      }
+    } else {
+      if (InputFilename == "-") {
+        OutputFilename = "-";
+        Out = &std::cout;
+      } else {
+        std::string IFN = InputFilename;
+        int Len = IFN.length();
+        if (IFN[Len-3] == '.' && IFN[Len-2] == 'l' && IFN[Len-1] == 'l') {
+          // Source ends in .ll
+          OutputFilename = std::string(IFN.begin(), IFN.end()-3);
+        } else {
+          OutputFilename = IFN;   // Append a .cpp to it
+        }
+        OutputFilename += ".cpp";
+
+        if (!Force && std::ifstream(OutputFilename.c_str())) {
+          // If force is not specified, make sure not to overwrite a file!
+          std::cerr << argv[0] << ": error opening '" << OutputFilename
+                    << "': file exists!\n"
+                    << "Use -f command line argument to force output\n";
+          return 1;
+        }
+
+        Out = new std::ofstream(OutputFilename.c_str(), std::ios::out |
+                                std::ios::trunc | std::ios::binary);
+        // Make sure that the Out file gets unlinked from the disk if we get a
+        // SIGINT
+        sys::RemoveFileOnSignal(sys::Path(OutputFilename));
+      }
+    }
+
+    if (!Out->good()) {
+      std::cerr << argv[0] << ": error opening " << OutputFilename << "!\n";
+      return 1;
+    }
+
+    WriteModuleToCppFile(M.get(), *Out);
+
+  } catch (const ParseException &E) {
+    std::cerr << argv[0] << ": " << E.getMessage() << "\n";
+    exitCode = 1;
+  } catch (const std::string& msg) {
+    std::cerr << argv[0] << ": " << msg << "\n";
+    exitCode = 1;
+  } catch (...) {
+    std::cerr << argv[0] << ": Unexpected unknown exception occurred.\n";
+    exitCode = 1;
+  }
+
+  if (Out != &std::cout) delete Out;
+  return exitCode;
+}
+