Allow conditional lit tests in Subzero, based on build flags.

src/llvm2ice.cpp

 //===- subzero/src/llvm2ice.cpp - Driver for testing ----------------------===//
 //
 //                        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.
 //
 //===----------------------------------------------------------------------===//
 
 #include <fstream>
 #include <iostream>
 
+#include "llvm/ADT/STLExtras.h"
 #include "llvm/IR/LLVMContext.h"
 #include "llvm/IRReader/IRReader.h"
 #include "llvm/Support/CommandLine.h"
 #include "llvm/Support/raw_os_ostream.h"
 #include "llvm/Support/SourceMgr.h"
 
 #include "IceCfg.h"
 #include "IceClFlags.h"
 #include "IceConverter.h"
 #include "PNaClTranslator.h"
@@ skipping 125 matching lines @@
                            cl::desc("Use integrated assembler (default yes)"),
                            cl::init(true));
 
 static cl::alias UseIas("ias", cl::desc("Alias for -integrated-as"),
                         cl::NotHidden, cl::aliasopt(UseIntegratedAssembler));
 
 static cl::opt<bool> AlwaysExitSuccess(
     "exit-success", cl::desc("Exit with success status, even if errors found"),
     cl::init(false));
 
+static cl::opt<bool> GenerateBuildAtts(
+    "build-atts", cl::desc("Generate list of build attributes associated with "
+                           "this executable."),
+    cl::init(false));
+
 static int GetReturnValue(int Val) {
   if (AlwaysExitSuccess)
     return 0;
   return Val;
 }
 
+static struct {
+  const char *FlagName;
+  int FlagValue;
+} ConditionalBuildAttributes[] = {
+  { "text_asm", ALLOW_TEXT_ASM },
+  { "dump", ALLOW_DUMP },
+  { "llvm_cl", ALLOW_LLVM_CL },
+  { "llvm_ir", ALLOW_LLVM_IR },
+  { "llvm_ir_as_input", ALLOW_LLVM_IR_AS_INPUT }
+};
+
+// Validates values of build attributes. Prints them to Stream if
+// Stream is non-null.
+static void ValidateAndGenerateBuildAttributes(raw_os_ostream *Stream) {
+
+  // TODO(kschimpf): Conditionalize this once we have multiple targets.

[Jim Stichnoth, 2014/10/21 21:58:41]

After the GlobalContext object is created, you could actually do something like

  *Stream << Ctx.getTarget()->getArchAttr() << "\n";

Either add this to the TODO, or implement it. :)

[Karl, 2014/10/22 17:03:36]

Done.

+  if (Stream)
+    *Stream << "x86-32\n";
+
+  for (size_t i = 0; i < 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;
+      raw_string_ostream StrBuf(Buffer);
+      StrBuf << "Flag " << ConditionalBuildAttributes[i].FlagName
+             << " must be defined as 0/1. Found: "
+             << ConditionalBuildAttributes[i].FlagValue;
+      report_fatal_error(StrBuf.str());
+    }
+    }
+  }
+}
+
 int main(int argc, char **argv) {
 
   cl::ParseCommandLineOptions(argc, argv);
 
   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();
+
+  ValidateAndGenerateBuildAttributes(GenerateBuildAtts ? Os : nullptr);
+  if (GenerateBuildAtts)
+    return GetReturnValue(0);
+
   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();
 
   Ice::ClFlags Flags;
   Flags.DisableInternal = DisableInternal;
   Flags.SubzeroTimingEnabled = SubzeroTimingEnabled;
@@ skipping 38 matching lines @@
   if (TimeEachFunction) {
     const bool DumpCumulative = false;
     Ctx.dumpTimers(Ice::GlobalContext::TSK_Funcs, DumpCumulative);
   }
   if (SubzeroTimingEnabled)
     Ctx.dumpTimers();
   const bool FinalStats = true;
   Ctx.dumpStats("_FINAL_", FinalStats);
   return GetReturnValue(ErrorStatus);
 }