It's not necessary to do rounding for alloca operations when the requested

alignment is equal to the stack alignment.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@40004 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 304 insertions, 0 deletions

diff --git a/tools/llc/llc.cpp b/tools/llc/llc.cpp
new file mode 100644
index 0000000..b53f59b
--- /dev/null
+++ b/tools/llc/llc.cpp
@@ -0,0 +1,304 @@
+//===-- llc.cpp - Implement the LLVM Native Code Generator ----------------===//
+//
+//                     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 is the llc code generator driver. It provides a convenient
+// command-line interface for generating native assembly-language code
+// or C code, given LLVM bitcode.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Bitcode/ReaderWriter.h"
+#include "llvm/CodeGen/FileWriters.h"
+#include "llvm/CodeGen/LinkAllCodegenComponents.h"
+#include "llvm/Target/SubtargetFeature.h"
+#include "llvm/Target/TargetData.h"
+#include "llvm/Target/TargetMachine.h"
+#include "llvm/Target/TargetMachineRegistry.h"
+#include "llvm/Transforms/Scalar.h"
+#include "llvm/Module.h"
+#include "llvm/ModuleProvider.h"
+#include "llvm/PassManager.h"
+#include "llvm/Pass.h"
+#include "llvm/Support/CommandLine.h"
+#include "llvm/Support/ManagedStatic.h"
+#include "llvm/Support/MemoryBuffer.h"
+#include "llvm/Support/PluginLoader.h"
+#include "llvm/Support/FileUtilities.h"
+#include "llvm/Analysis/Verifier.h"
+#include "llvm/System/Signals.h"
+#include "llvm/Config/config.h"
+#include "llvm/LinkAllVMCore.h"
+#include <fstream>
+#include <iostream>
+#include <memory>
+using namespace llvm;
+
+// General options for llc.  Other pass-specific options are specified
+// within the corresponding llc passes, and target-specific options
+// and back-end code generation options are specified with the target machine.
+//
+static cl::opt<std::string>
+InputFilename(cl::Positional, cl::desc("<input bitcode>"), cl::init("-"));
+
+static cl::opt<std::string>
+OutputFilename("o", cl::desc("Output filename"), cl::value_desc("filename"));
+
+static cl::opt<bool> Force("f", cl::desc("Overwrite output files"));
+
+static cl::opt<bool> Fast("fast", 
+      cl::desc("Generate code quickly, potentially sacrificing code quality"));
+
+static cl::opt<std::string>
+TargetTriple("mtriple", cl::desc("Override target triple for module"));
+
+static cl::opt<const TargetMachineRegistry::Entry*, false, TargetNameParser>
+MArch("march", cl::desc("Architecture to generate code for:"));
+
+static cl::opt<std::string>
+MCPU("mcpu", 
+  cl::desc("Target a specific cpu type (-mcpu=help for details)"),
+  cl::value_desc("cpu-name"),
+  cl::init(""));
+
+static cl::list<std::string>
+MAttrs("mattr", 
+  cl::CommaSeparated,
+  cl::desc("Target specific attributes (-mattr=help for details)"),
+  cl::value_desc("a1,+a2,-a3,..."));
+
+cl::opt<TargetMachine::CodeGenFileType>
+FileType("filetype", cl::init(TargetMachine::AssemblyFile),
+  cl::desc("Choose a file type (not all types are supported by all targets):"),
+  cl::values(
+       clEnumValN(TargetMachine::AssemblyFile,    "asm",
+                  "  Emit an assembly ('.s') file"),
+       clEnumValN(TargetMachine::ObjectFile,    "obj",
+                  "  Emit a native object ('.o') file [experimental]"),
+       clEnumValN(TargetMachine::DynamicLibrary, "dynlib",
+                  "  Emit a native dynamic library ('.so') file"
+                  " [experimental]"),
+       clEnumValEnd));
+
+cl::opt<bool> NoVerify("disable-verify", cl::Hidden,
+                       cl::desc("Do not verify input module"));
+
+
+// GetFileNameRoot - Helper function to get the basename of a filename.
+static inline std::string
+GetFileNameRoot(const std::string &InputFilename) {
+  std::string IFN = InputFilename;
+  std::string outputFilename;
+  int Len = IFN.length();
+  if ((Len > 2) &&
+      IFN[Len-3] == '.' && IFN[Len-2] == 'b' && IFN[Len-1] == 'c') {
+    outputFilename = std::string(IFN.begin(), IFN.end()-3); // s/.bc/.s/
+  } else {
+    outputFilename = IFN;
+  }
+  return outputFilename;
+}
+
+static std::ostream *GetOutputStream(const char *ProgName) {
+  if (OutputFilename != "") {
+    if (OutputFilename == "-")
+      return &std::cout;
+
+    // Specified an output filename?
+    if (!Force && std::ifstream(OutputFilename.c_str())) {
+      // If force is not specified, make sure not to overwrite a file!
+      std::cerr << ProgName << ": error opening '" << OutputFilename
+                << "': file exists!\n"
+                << "Use -f command line argument to force output\n";
+      return 0;
+    }
+    // Make sure that the Out file gets unlinked from the disk if we get a
+    // SIGINT
+    sys::RemoveFileOnSignal(sys::Path(OutputFilename));
+
+    return new std::ofstream(OutputFilename.c_str());
+  }
+  
+  if (InputFilename == "-") {
+    OutputFilename = "-";
+    return &std::cout;
+  }
+
+  OutputFilename = GetFileNameRoot(InputFilename);
+    
+  switch (FileType) {
+  case TargetMachine::AssemblyFile:
+    if (MArch->Name[0] != 'c' || MArch->Name[1] != 0)  // not CBE
+      OutputFilename += ".s";
+    else
+      OutputFilename += ".cbe.c";
+    break;
+  case TargetMachine::ObjectFile:
+    OutputFilename += ".o";
+    break;
+  case TargetMachine::DynamicLibrary:
+    OutputFilename += LTDL_SHLIB_EXT;
+    break;
+  }
+  
+  if (!Force && std::ifstream(OutputFilename.c_str())) {
+    // If force is not specified, make sure not to overwrite a file!
+    std::cerr << ProgName << ": error opening '" << OutputFilename
+                          << "': file exists!\n"
+                          << "Use -f command line argument to force output\n";
+    return 0;
+  }
+  
+  // Make sure that the Out file gets unlinked from the disk if we get a
+  // SIGINT
+  sys::RemoveFileOnSignal(sys::Path(OutputFilename));
+  
+  std::ostream *Out = new std::ofstream(OutputFilename.c_str());
+  if (!Out->good()) {
+    std::cerr << ProgName << ": error opening " << OutputFilename << "!\n";
+    delete Out;
+    return 0;
+  }
+  
+  return Out;
+}
+
+// main - Entry point for the llc compiler.
+//
+int main(int argc, char **argv) {
+  llvm_shutdown_obj X;  // Call llvm_shutdown() on exit.
+  cl::ParseCommandLineOptions(argc, argv, " llvm system compiler\n");
+  sys::PrintStackTraceOnErrorSignal();
+
+  // Load the module to be compiled...
+  std::string ErrorMessage;
+  std::auto_ptr<Module> M;
+  
+  std::auto_ptr<MemoryBuffer> Buffer(
+                   MemoryBuffer::getFileOrSTDIN(InputFilename, &ErrorMessage));
+  if (Buffer.get())
+    M.reset(ParseBitcodeFile(Buffer.get(), &ErrorMessage));
+  if (M.get() == 0) {
+    std::cerr << argv[0] << ": bitcode didn't read correctly.\n";
+    std::cerr << "Reason: " << ErrorMessage << "\n";
+    return 1;
+  }
+  Module &mod = *M.get();
+  
+  // If we are supposed to override the target triple, do so now.
+  if (!TargetTriple.empty())
+    mod.setTargetTriple(TargetTriple);
+  
+  // Allocate target machine.  First, check whether the user has
+  // explicitly specified an architecture to compile for.
+  if (MArch == 0) {
+    std::string Err;
+    MArch = TargetMachineRegistry::getClosestStaticTargetForModule(mod, Err);
+    if (MArch == 0) {
+      std::cerr << argv[0] << ": error auto-selecting target for module '"
+                << Err << "'.  Please use the -march option to explicitly "
+                << "pick a target.\n";
+      return 1;
+    }
+  }
+
+  // Package up features to be passed to target/subtarget
+  std::string FeaturesStr;
+  if (MCPU.size() || MAttrs.size()) {
+    SubtargetFeatures Features;
+    Features.setCPU(MCPU);
+    for (unsigned i = 0; i != MAttrs.size(); ++i)
+      Features.AddFeature(MAttrs[i]);
+    FeaturesStr = Features.getString();
+  }
+  
+  std::auto_ptr<TargetMachine> target(MArch->CtorFn(mod, FeaturesStr));
+  assert(target.get() && "Could not allocate target machine!");
+  TargetMachine &Target = *target.get();
+
+  // Figure out where we are going to send the output...
+  std::ostream *Out = GetOutputStream(argv[0]);
+  if (Out == 0) return 1;
+  
+  // If this target requires addPassesToEmitWholeFile, do it now.  This is
+  // used by strange things like the C backend.
+  if (Target.WantsWholeFile()) {
+    PassManager PM;
+    PM.add(new TargetData(*Target.getTargetData()));
+    if (!NoVerify)
+      PM.add(createVerifierPass());
+    
+    // Ask the target to add backend passes as necessary.
+    if (Target.addPassesToEmitWholeFile(PM, *Out, FileType, Fast)) {
+      std::cerr << argv[0] << ": target does not support generation of this"
+                << " file type!\n";
+      if (Out != &std::cout) delete Out;
+      // And the Out file is empty and useless, so remove it now.
+      sys::Path(OutputFilename).eraseFromDisk();
+      return 1;
+    }
+    PM.run(mod);
+  } else {
+    // Build up all of the passes that we want to do to the module.
+    FunctionPassManager Passes(new ExistingModuleProvider(M.get()));
+    Passes.add(new TargetData(*Target.getTargetData()));
+    
+#ifndef NDEBUG
+    if (!NoVerify)
+      Passes.add(createVerifierPass());
+#endif
+  
+    // Ask the target to add backend passes as necessary.
+    MachineCodeEmitter *MCE = 0;
+
+    switch (Target.addPassesToEmitFile(Passes, *Out, FileType, Fast)) {
+    default:
+      assert(0 && "Invalid file model!");
+      return 1;
+    case FileModel::Error:
+      std::cerr << argv[0] << ": target does not support generation of this"
+                << " file type!\n";
+      if (Out != &std::cout) delete Out;
+      // And the Out file is empty and useless, so remove it now.
+      sys::Path(OutputFilename).eraseFromDisk();
+      return 1;
+    case FileModel::AsmFile:
+      break;
+    case FileModel::MachOFile:
+      MCE = AddMachOWriter(Passes, *Out, Target);
+      break;
+    case FileModel::ElfFile:
+      MCE = AddELFWriter(Passes, *Out, Target);
+      break;
+    }
+
+    if (Target.addPassesToEmitFileFinish(Passes, MCE, Fast)) {
+      std::cerr << argv[0] << ": target does not support generation of this"
+                << " file type!\n";
+      if (Out != &std::cout) delete Out;
+      // And the Out file is empty and useless, so remove it now.
+      sys::Path(OutputFilename).eraseFromDisk();
+      return 1;
+    }
+  
+    Passes.doInitialization();
+  
+    // Run our queue of passes all at once now, efficiently.
+    // TODO: this could lazily stream functions out of the module.
+    for (Module::iterator I = mod.begin(), E = mod.end(); I != E; ++I)
+      if (!I->isDeclaration())
+        Passes.run(*I);
+    
+    Passes.doFinalization();
+  }
+    
+  // Delete the ostream if it's not a stdout stream
+  if (Out != &std::cout) delete Out;
+
+  return 0;
+}