Refactor Subzero initialization and add a browser callback handler.

src/IceCompiler.cpp

Index: src/IceCompiler.cpp
diff --git a/src/IceCompiler.cpp b/src/IceCompiler.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..47f1ba407c2fa86adeec2209b551a0612f69223f
--- /dev/null
+++ b/src/IceCompiler.cpp
@@ -0,0 +1,164 @@
+//===- subzero/src/IceCompiler.cpp - Driver for bitcode translation -------===//
+//
+//                        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 for translating PNaCl bitcode into native code.
+// It can either directly parse the binary bitcode file, or use LLVM routines to
+// parse a textual bitcode file into LLVM IR and then convert LLVM IR into ICE.
+// In either case, the high-level ICE is then compiled down to native code, as
+// either an ELF object file or a textual asm file.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/ADT/STLExtras.h"
+#include "llvm/IR/LLVMContext.h"
+#include "llvm/IR/Module.h"
+#include "llvm/IRReader/IRReader.h"
+#include "llvm/Support/SourceMgr.h"
+#include "llvm/Support/StreamingMemoryObject.h"
+
+#include "IceCfg.h"
+#include "IceClFlags.h"
+#include "IceClFlagsExtra.h"
+#include "IceCompiler.h"
+#include "IceConverter.h"
+#include "IceELFObjectWriter.h"
+#include "PNaClTranslator.h"
+namespace Ice {
+
+namespace {
+
+struct {
+  const char *FlagName;
+  int FlagValue;
+} ConditionalBuildAttributes[] = {{"dump", ALLOW_DUMP},
+                                  {"disable_ir_gen", ALLOW_DISABLE_IR_GEN},
+                                  {"llvm_cl", ALLOW_LLVM_CL},
+                                  {"llvm_ir", ALLOW_LLVM_IR},
+                                  {"llvm_ir_as_input", ALLOW_LLVM_IR_AS_INPUT},
+                                  {"minimal_build", ALLOW_MINIMAL_BUILD},
+                                  {"browser_mode", PNACL_BROWSER_TRANSLATOR}};
+
+// Validates values of build attributes. Prints them to Stream if
+// Stream is non-null.
+void ValidateAndGenerateBuildAttributes(const ClFlags &Flags, Ostream *Stream) {
+  if (Stream)
+    *Stream << Flags.getTargetArch() << "\n";
+
+  for (size_t i = 0; i < llvm::array_lengthof(ConditionalBuildAttributes);
+       ++i) {
+    switch (ConditionalBuildAttributes[i].FlagValue) {
+    case 0:
+      if (Stream)
+        *Stream << "no_" << ConditionalBuildAttributes[i].FlagName << "\n";
+      break;
+    case 1:
+      if (Stream)
+        *Stream << "allow_" << ConditionalBuildAttributes[i].FlagName << "\n";
+      break;
+    default: {
+      std::string Buffer;
+      llvm::raw_string_ostream StrBuf(Buffer);
+      StrBuf << "Flag " << ConditionalBuildAttributes[i].FlagName
+             << " must be defined as 0/1. Found: "
+             << ConditionalBuildAttributes[i].FlagValue;
+      llvm::report_fatal_error(StrBuf.str());
+    }
+    }
+  }
+}
+
+} // end of anonymous namespace
+
+void Compiler::run(const Ice::ClFlagsExtra &ExtraFlags, GlobalContext &Ctx,
+                   std::unique_ptr<llvm::DataStreamer> &&InputStream) {
+  ValidateAndGenerateBuildAttributes(
+      Ctx.getFlags(),
+      ExtraFlags.getGenerateBuildAtts() ? &Ctx.getStrDump() : nullptr);
+  if (ExtraFlags.getGenerateBuildAtts())
+    return Ctx.getErrorStatus()->assign(EC_None);
+
+  if (!ALLOW_DISABLE_IR_GEN && Ctx.getFlags().getDisableIRGeneration()) {
+    Ctx.getStrDump() << "Error: Build doesn't allow --no-ir-gen when not "
+                     << "ALLOW_DISABLE_IR_GEN!\n";
+    return Ctx.getErrorStatus()->assign(EC_Args);
+  }
+
+  // Force -build-on-read=0 for .ll files.
+  const std::string LLSuffix = ".ll";
+  const IceString &IRFilename = ExtraFlags.getIRFilename();
+  bool BuildOnRead = ExtraFlags.getBuildOnRead();
+  if (ALLOW_LLVM_IR_AS_INPUT && IRFilename.length() >= LLSuffix.length() &&
+      IRFilename.compare(IRFilename.length() - LLSuffix.length(),
+                         LLSuffix.length(), LLSuffix) == 0)
+    BuildOnRead = false;
+
+  TimerMarker T(Ice::TimerStack::TT_szmain, &Ctx);
+
+  if (Ctx.getFlags().getOutFileType() == FT_Elf) {
+    TimerMarker T1(Ice::TimerStack::TT_emit, &Ctx);
+    Ctx.getObjectWriter()->writeInitialELFHeader();
+  }
+
+  Ctx.startWorkerThreads();
+
+  std::unique_ptr<Translator> Translator;
+  if (BuildOnRead) {
+    std::unique_ptr<PNaClTranslator> PTranslator(new PNaClTranslator(&Ctx));
+    std::unique_ptr<llvm::StreamingMemoryObject> MemObj(
+        new llvm::StreamingMemoryObjectImpl(InputStream.release()));
+    PTranslator->translate(IRFilename, std::move(MemObj));
+    Translator.reset(PTranslator.release());
+  } else if (ALLOW_LLVM_IR) {
+    if (PNACL_BROWSER_TRANSLATOR) {
+      Ctx.getStrDump()
+          << "non BuildOnRead is not supported w/ PNACL_BROWSER_TRANSLATOR\n";
+      return Ctx.getErrorStatus()->assign(EC_Args);
+    }
+    // Parse the input LLVM IR file into a module.
+    llvm::SMDiagnostic Err;
+    TimerMarker T1(Ice::TimerStack::TT_parse, &Ctx);
+    llvm::raw_ostream *Verbose =
+        ExtraFlags.getLLVMVerboseErrors() ? &llvm::errs() : nullptr;
+    std::unique_ptr<llvm::Module> Mod =
+        NaClParseIRFile(IRFilename, ExtraFlags.getInputFileFormat(), Err,
+                        Verbose, llvm::getGlobalContext());
+    if (!Mod) {
+      Err.print(ExtraFlags.getAppName().c_str(), llvm::errs());
+      return Ctx.getErrorStatus()->assign(EC_Bitcode);
+    }
+
+    std::unique_ptr<Converter> Converter(new class Converter(Mod.get(), &Ctx));
+    Converter->convertToIce();
+    Translator.reset(Converter.release());
+  } else {
+    Ctx.getStrDump() << "Error: Build doesn't allow LLVM IR, "
+                     << "--build-on-read=0 not allowed\n";
+    return Ctx.getErrorStatus()->assign(EC_Args);
+  }
+
+  Ctx.waitForWorkerThreads();
+  Translator->transferErrorCode();
+  Translator->emitConstants();
+
+  if (Ctx.getFlags().getOutFileType() == FT_Elf) {
+    TimerMarker T1(Ice::TimerStack::TT_emit, &Ctx);
+    Ctx.getObjectWriter()->setUndefinedSyms(Ctx.getConstantExternSyms());
+    Ctx.getObjectWriter()->writeNonUserSections();
+  }
+  if (Ctx.getFlags().getSubzeroTimingEnabled())
+    Ctx.dumpTimers();
+  if (Ctx.getFlags().getTimeEachFunction()) {
+    const bool DumpCumulative = false;
+    Ctx.dumpTimers(GlobalContext::TSK_Funcs, DumpCumulative);
+  }
+  const bool FinalStats = true;
+  Ctx.dumpStats("_FINAL_", FinalStats);
+}
+
+} // end of namespace Ice