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//===-- AMDGPUTargetStreamer.cpp - Mips Target Streamer Methods -----------===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file provides AMDGPU specific target streamer methods.
//
//===----------------------------------------------------------------------===//

#include "AMDGPUTargetStreamer.h"
#include "AMDGPU.h"
#include "SIDefines.h"
#include "Utils/AMDGPUBaseInfo.h"
#include "Utils/AMDKernelCodeTUtils.h"
#include "llvm/ADT/Twine.h"
#include "llvm/BinaryFormat/ELF.h"
#include "llvm/IR/Constants.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/Metadata.h"
#include "llvm/IR/Module.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCELFStreamer.h"
#include "llvm/MC/MCObjectFileInfo.h"
#include "llvm/MC/MCSectionELF.h"
#include "llvm/Support/FormattedStream.h"

namespace llvm {
#include "AMDGPUPTNote.h"
}

using namespace llvm;
using namespace llvm::AMDGPU;

//===----------------------------------------------------------------------===//
// AMDGPUTargetStreamer
//===----------------------------------------------------------------------===//

AMDGPUTargetStreamer::AMDGPUTargetStreamer(MCStreamer &S)
    : MCTargetStreamer(S) {}

void AMDGPUTargetStreamer::EmitStartOfCodeObjectMetadata(const Module &Mod) {
  CodeObjectMetadataStreamer.begin(Mod);
}

void AMDGPUTargetStreamer::EmitKernelCodeObjectMetadata(
    const Function &Func, const amd_kernel_code_t &KernelCode) {
  CodeObjectMetadataStreamer.emitKernel(Func, KernelCode);
}

void AMDGPUTargetStreamer::EmitEndOfCodeObjectMetadata() {
  CodeObjectMetadataStreamer.end();
  EmitCodeObjectMetadata(CodeObjectMetadataStreamer.toYamlString().get());
}

//===----------------------------------------------------------------------===//
// AMDGPUTargetAsmStreamer
//===----------------------------------------------------------------------===//

AMDGPUTargetAsmStreamer::AMDGPUTargetAsmStreamer(MCStreamer &S,
                                                 formatted_raw_ostream &OS)
    : AMDGPUTargetStreamer(S), OS(OS) { }

void
AMDGPUTargetAsmStreamer::EmitDirectiveHSACodeObjectVersion(uint32_t Major,
                                                           uint32_t Minor) {
  OS << "\t.hsa_code_object_version " <<
        Twine(Major) << "," << Twine(Minor) << '\n';
}

void
AMDGPUTargetAsmStreamer::EmitDirectiveHSACodeObjectISA(uint32_t Major,
                                                       uint32_t Minor,
                                                       uint32_t Stepping,
                                                       StringRef VendorName,
                                                       StringRef ArchName) {
  OS << "\t.hsa_code_object_isa " <<
        Twine(Major) << "," << Twine(Minor) << "," << Twine(Stepping) <<
        ",\"" << VendorName << "\",\"" << ArchName << "\"\n";

}

void
AMDGPUTargetAsmStreamer::EmitAMDKernelCodeT(const amd_kernel_code_t &Header) {
  OS << "\t.amd_kernel_code_t\n";
  dumpAmdKernelCode(&Header, OS, "\t\t");
  OS << "\t.end_amd_kernel_code_t\n";
}

void AMDGPUTargetAsmStreamer::EmitAMDGPUSymbolType(StringRef SymbolName,
                                                   unsigned Type) {
  switch (Type) {
    default: llvm_unreachable("Invalid AMDGPU symbol type");
    case ELF::STT_AMDGPU_HSA_KERNEL:
      OS << "\t.amdgpu_hsa_kernel " << SymbolName << '\n' ;
      break;
  }
}

bool AMDGPUTargetAsmStreamer::EmitCodeObjectMetadata(StringRef YamlString) {
  auto VerifiedYamlString = CodeObjectMetadataStreamer.toYamlString(YamlString);
  if (!VerifiedYamlString)
    return false;

  OS << '\t' << AMDGPU::CodeObject::MetadataAssemblerDirectiveBegin << '\n';
  OS << VerifiedYamlString.get();
  OS << '\t' << AMDGPU::CodeObject::MetadataAssemblerDirectiveEnd << '\n';

  return true;
}

//===----------------------------------------------------------------------===//
// AMDGPUTargetELFStreamer
//===----------------------------------------------------------------------===//

AMDGPUTargetELFStreamer::AMDGPUTargetELFStreamer(MCStreamer &S)
    : AMDGPUTargetStreamer(S), Streamer(S) {}

MCELFStreamer &AMDGPUTargetELFStreamer::getStreamer() {
  return static_cast<MCELFStreamer &>(Streamer);
}

void AMDGPUTargetELFStreamer::EmitAMDGPUNote(
    const MCExpr *DescSZ, ElfNote::NoteType Type,
    function_ref<void(MCELFStreamer &)> EmitDesc) {
  auto &S = getStreamer();
  auto &Context = S.getContext();

  auto NameSZ = sizeof(ElfNote::NoteName);

  S.PushSection();
  S.SwitchSection(Context.getELFSection(
    ElfNote::SectionName, ELF::SHT_NOTE, ELF::SHF_ALLOC));
  S.EmitIntValue(NameSZ, 4);                                  // namesz
  S.EmitValue(DescSZ, 4);                                     // descz
  S.EmitIntValue(Type, 4);                                    // type
  S.EmitBytes(StringRef(ElfNote::NoteName, NameSZ));          // name
  S.EmitValueToAlignment(4, 0, 1, 0);                         // padding 0
  EmitDesc(S);                                                // desc
  S.EmitValueToAlignment(4, 0, 1, 0);                         // padding 0
  S.PopSection();
}

void
AMDGPUTargetELFStreamer::EmitDirectiveHSACodeObjectVersion(uint32_t Major,
                                                           uint32_t Minor) {

  EmitAMDGPUNote(
    MCConstantExpr::create(8, getContext()),
    ElfNote::NT_AMDGPU_HSA_CODE_OBJECT_VERSION,
    [&](MCELFStreamer &OS){
      OS.EmitIntValue(Major, 4);
      OS.EmitIntValue(Minor, 4);
    }
  );
}

void
AMDGPUTargetELFStreamer::EmitDirectiveHSACodeObjectISA(uint32_t Major,
                                                       uint32_t Minor,
                                                       uint32_t Stepping,
                                                       StringRef VendorName,
                                                       StringRef ArchName) {
  uint16_t VendorNameSize = VendorName.size() + 1;
  uint16_t ArchNameSize = ArchName.size() + 1;

  unsigned DescSZ = sizeof(VendorNameSize) + sizeof(ArchNameSize) +
    sizeof(Major) + sizeof(Minor) + sizeof(Stepping) +
    VendorNameSize + ArchNameSize;

  EmitAMDGPUNote(
    MCConstantExpr::create(DescSZ, getContext()),
    ElfNote::NT_AMDGPU_HSA_ISA,
    [&](MCELFStreamer &OS) {
      OS.EmitIntValue(VendorNameSize, 2);
      OS.EmitIntValue(ArchNameSize, 2);
      OS.EmitIntValue(Major, 4);
      OS.EmitIntValue(Minor, 4);
      OS.EmitIntValue(Stepping, 4);
      OS.EmitBytes(VendorName);
      OS.EmitIntValue(0, 1); // NULL terminate VendorName
      OS.EmitBytes(ArchName);
      OS.EmitIntValue(0, 1); // NULL terminte ArchName
    }
  );
}

void
AMDGPUTargetELFStreamer::EmitAMDKernelCodeT(const amd_kernel_code_t &Header) {

  MCStreamer &OS = getStreamer();
  OS.PushSection();
  OS.EmitBytes(StringRef((const char*)&Header, sizeof(Header)));
  OS.PopSection();
}

void AMDGPUTargetELFStreamer::EmitAMDGPUSymbolType(StringRef SymbolName,
                                                   unsigned Type) {
  MCSymbolELF *Symbol = cast<MCSymbolELF>(
      getStreamer().getContext().getOrCreateSymbol(SymbolName));
  Symbol->setType(ELF::STT_AMDGPU_HSA_KERNEL);
}

bool AMDGPUTargetELFStreamer::EmitCodeObjectMetadata(StringRef YamlString) {
  auto VerifiedYamlString = CodeObjectMetadataStreamer.toYamlString(YamlString);
  if (!VerifiedYamlString)
    return false;

  // Create two labels to mark the beginning and end of the desc field
  // and a MCExpr to calculate the size of the desc field.
  auto &Context = getContext();
  auto *DescBegin = Context.createTempSymbol();
  auto *DescEnd = Context.createTempSymbol();
  auto *DescSZ = MCBinaryExpr::createSub(
    MCSymbolRefExpr::create(DescEnd, Context),
    MCSymbolRefExpr::create(DescBegin, Context), Context);

  EmitAMDGPUNote(
    DescSZ,
    ElfNote::NT_AMDGPU_HSA_CODE_OBJECT_METADATA,
    [&](MCELFStreamer &OS) {
      OS.EmitLabel(DescBegin);
      OS.EmitBytes(VerifiedYamlString.get());
      OS.EmitLabel(DescEnd);
    }
  );

  return true;
}