Refactor llvm2ice so that Ice can be built while reading bitcode.

src/IceConverter.cpp

-//===- subzero/src/llvm2ice.cpp - Driver for testing ----------------------===//
+//===- subzero/src/IceConverter.cpp - Converts LLVM to Ice  ---------------===//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 //
-// This file defines a driver that uses LLVM capabilities to parse a
-// bitcode file and build the LLVM IR, and then convert the LLVM basic
-// blocks, instructions, and operands into their Subzero equivalents.
+// This file implements the LLVM to ICE converter.
 //
 //===----------------------------------------------------------------------===//
 
+#include "IceConverter.h"
+
 #include "IceCfg.h"
 #include "IceCfgNode.h"
 #include "IceDefs.h"
 #include "IceGlobalContext.h"
 #include "IceInst.h"
 #include "IceOperand.h"
 #include "IceTargetLowering.h"
 #include "IceTypes.h"
 
 #include "llvm/IR/Constant.h"
 #include "llvm/IR/Constants.h"
 #include "llvm/IR/DataLayout.h"
 #include "llvm/IR/Instruction.h"
 #include "llvm/IR/Instructions.h"
 #include "llvm/IR/LLVMContext.h"
 #include "llvm/IR/Module.h"
-#include "llvm/IRReader/IRReader.h"
-#include "llvm/Support/CommandLine.h"
-#include "llvm/Support/ErrorHandling.h"
-#include "llvm/Support/raw_os_ostream.h"
-#include "llvm/Support/SourceMgr.h"
 
-#include <fstream>
 #include <iostream>
 
 using namespace llvm;
 
+namespace {
+
 // Debugging helper
 template <typename T> static std::string LLVMObjectAsString(const T *O) {
   std::string Dump;
   raw_string_ostream Stream(Dump);
   O->print(Stream);
   return Stream.str();
 }
 
 // Converter from LLVM to ICE. The entry point is the convertFunction method.
 //
@@ skipping 560 matching lines @@
 private:
   // Data
   Ice::GlobalContext *Ctx;
   Ice::Cfg *Func;
   Ice::CfgNode *CurrentNode;
   Ice::Type SubzeroPointerType;
   std::map<const Value *, Ice::Variable *> VarMap;
   std::map<const BasicBlock *, Ice::CfgNode *> NodeMap;
 };
 
-static cl::list<Ice::VerboseItem> VerboseList(
-    "verbose", cl::CommaSeparated,
-    cl::desc("Verbose options (can be comma-separated):"),
-    cl::values(
-        clEnumValN(Ice::IceV_Instructions, "inst", "Print basic instructions"),
-        clEnumValN(Ice::IceV_Deleted, "del", "Include deleted instructions"),
-        clEnumValN(Ice::IceV_InstNumbers, "instnum",
-                   "Print instruction numbers"),
-        clEnumValN(Ice::IceV_Preds, "pred", "Show predecessors"),
-        clEnumValN(Ice::IceV_Succs, "succ", "Show successors"),
-        clEnumValN(Ice::IceV_Liveness, "live", "Liveness information"),
-        clEnumValN(Ice::IceV_RegManager, "rmgr", "Register manager status"),
-        clEnumValN(Ice::IceV_RegOrigins, "orig", "Physical register origins"),
-        clEnumValN(Ice::IceV_LinearScan, "regalloc", "Linear scan details"),
-        clEnumValN(Ice::IceV_Frame, "frame", "Stack frame layout details"),
-        clEnumValN(Ice::IceV_Timing, "time", "Pass timing details"),
-        clEnumValN(Ice::IceV_All, "all", "Use all verbose options"),
-        clEnumValN(Ice::IceV_None, "none", "No verbosity"), clEnumValEnd));
-static cl::opt<Ice::TargetArch> TargetArch(
-    "target", cl::desc("Target architecture:"), cl::init(Ice::Target_X8632),
-    cl::values(
-        clEnumValN(Ice::Target_X8632, "x8632", "x86-32"),
-        clEnumValN(Ice::Target_X8632, "x86-32", "x86-32 (same as x8632)"),
-        clEnumValN(Ice::Target_X8632, "x86_32", "x86-32 (same as x8632)"),
-        clEnumValN(Ice::Target_X8664, "x8664", "x86-64"),
-        clEnumValN(Ice::Target_X8664, "x86-64", "x86-64 (same as x8664)"),
-        clEnumValN(Ice::Target_X8664, "x86_64", "x86-64 (same as x8664)"),
-        clEnumValN(Ice::Target_ARM32, "arm", "arm32"),
-        clEnumValN(Ice::Target_ARM32, "arm32", "arm32 (same as arm)"),
-        clEnumValN(Ice::Target_ARM64, "arm64", "arm64"), clEnumValEnd));
-static cl::opt<Ice::OptLevel>
-OptLevel(cl::desc("Optimization level"), cl::init(Ice::Opt_m1),
-         cl::value_desc("level"),
-         cl::values(clEnumValN(Ice::Opt_m1, "Om1", "-1"),
-                    clEnumValN(Ice::Opt_m1, "O-1", "-1"),
-                    clEnumValN(Ice::Opt_0, "O0", "0"),
-                    clEnumValN(Ice::Opt_1, "O1", "1"),
-                    clEnumValN(Ice::Opt_2, "O2", "2"), clEnumValEnd));
-static cl::opt<std::string> IRFilename(cl::Positional, cl::desc("<IR file>"),
-                                       cl::init("-"));
-static cl::opt<std::string> OutputFilename("o",
-                                           cl::desc("Override output filename"),
-                                           cl::init("-"),
-                                           cl::value_desc("filename"));
-static cl::opt<std::string> LogFilename("log", cl::desc("Set log filename"),
-                                        cl::init("-"),
-                                        cl::value_desc("filename"));
-static cl::opt<std::string>
-TestPrefix("prefix", cl::desc("Prepend a prefix to symbol names for testing"),
-           cl::init(""), cl::value_desc("prefix"));
-static cl::opt<bool>
-DisableInternal("external",
-                cl::desc("Disable 'internal' linkage type for testing"));
-static cl::opt<bool>
-DisableTranslation("notranslate", cl::desc("Disable Subzero translation"));
+}
 
-static cl::opt<bool> SubzeroTimingEnabled(
-    "timing", cl::desc("Enable breakdown timing of Subzero translation"));
-
-static cl::opt<NaClFileFormat> InputFileFormat(
-    "bitcode-format", cl::desc("Define format of input file:"),
-    cl::values(clEnumValN(LLVMFormat, "llvm", "LLVM file (default)"),
-               clEnumValN(PNaClFormat, "pnacl", "PNaCl bitcode file"),
-               clEnumValEnd),
-    cl::init(LLVMFormat));
-
-int main(int argc, char **argv) {
+int Llvm2Ice::Converter::convertToIce(llvm::Module *Mod) {
   int ExitStatus = 0;
 
-  cl::ParseCommandLineOptions(argc, argv);
-
-  // Parse the input LLVM IR file into a module.
-  SMDiagnostic Err;
-  Module *Mod;
-
-  {
-    Ice::Timer T;
-    Mod = NaClParseIRFile(IRFilename, InputFileFormat, Err, getGlobalContext());
-
-    if (SubzeroTimingEnabled) {
-      std::cerr << "[Subzero timing] IR Parsing: " << T.getElapsedSec()
-                << " sec\n";
-    }
-  }
-
-  if (!Mod) {
-    Err.print(argv[0], errs());
-    return 1;
-  }
-
-  Ice::VerboseMask VMask = Ice::IceV_None;
-  for (unsigned i = 0; i != VerboseList.size(); ++i)
-    VMask |= VerboseList[i];
-
-  std::ofstream Ofs;
-  if (OutputFilename != "-") {
-    Ofs.open(OutputFilename.c_str(), std::ofstream::out);
-  }
-  raw_os_ostream *Os =
-      new raw_os_ostream(OutputFilename == "-" ? std::cout : Ofs);
-  Os->SetUnbuffered();
-  std::ofstream Lfs;
-  if (LogFilename != "-") {
-    Lfs.open(LogFilename.c_str(), std::ofstream::out);
-  }
-  raw_os_ostream *Ls = new raw_os_ostream(LogFilename == "-" ? std::cout : Lfs);
-  Ls->SetUnbuffered();
-
   // Ideally, Func would be declared inside the loop and its object
   // would be automatically deleted at the end of the loop iteration.
   // However, emitting the constant pool requires a valid Cfg object,
   // so we need to defer deleting the last non-empty Cfg object until
   // outside the loop and after emitting the constant pool.  TODO:
   // Since all constants are globally pooled in the Ice::GlobalContext
   // object, change all Ice::Constant related functions to use
   // GlobalContext instead of Cfg, and then clean up this loop.
   OwningPtr<Ice::Cfg> Func;
-  Ice::GlobalContext Ctx(Ls, Os, VMask, TargetArch, OptLevel, TestPrefix);
 
   for (Module::const_iterator I = Mod->begin(), E = Mod->end(); I != E; ++I) {
     if (I->empty())
       continue;
-    LLVM2ICEConverter FunctionConverter(&Ctx);
+    LLVM2ICEConverter FunctionConverter(Ctx);
 
     Ice::Timer TConvert;
     Func.reset(FunctionConverter.convertFunction(I));
     if (DisableInternal)
       Func->setInternal(false);
 
     if (SubzeroTimingEnabled) {
       std::cerr << "[Subzero timing] Convert function "
                 << Func->getFunctionName() << ": " << TConvert.getElapsedSec()
                 << " sec\n";
@@ skipping 22 matching lines @@
                   << " sec\n";
       }
     }
   }
 
   if (!DisableTranslation && Func)
     Func->getTarget()->emitConstants();
 
   return ExitStatus;
 }