AMDGPUTargetStreamer.h

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//===-- AMDGPUTargetStreamer.h - AMDGPU Target Streamer --------*- C++ -*--===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
 
#ifndef LLVM_LIB_TARGET_AMDGPU_MCTARGETDESC_AMDGPUTARGETSTREAMER_H
#define LLVM_LIB_TARGET_AMDGPU_MCTARGETDESC_AMDGPUTARGETSTREAMER_H
 
#include "Utils/AMDGPUBaseInfo.h"
#include "Utils/AMDGPUPALMetadata.h"
#include "llvm/MC/MCStreamer.h"
 
struct amd_kernel_code_t;
 
namespace llvm {
 
class MCELFStreamer;
class MCSymbol;
class formatted_raw_ostream;
 
namespace AMDGPU {
 
struct MCKernelDescriptor;
namespace HSAMD {
struct Metadata;
}
} // namespace AMDGPU
 
class AMDGPUTargetStreamer : public MCTargetStreamer {
  AMDGPUPALMetadata PALMetadata;
 
protected:
  // TODO: Move HSAMetadataStream to AMDGPUTargetStreamer.
  std::optional<AMDGPU::IsaInfo::AMDGPUTargetID> TargetID;
  unsigned CodeObjectVersion;
 
  MCContext &getContext() const { return Streamer.getContext(); }
 
public:
  AMDGPUTargetStreamer(MCStreamer &S)
      : MCTargetStreamer(S),
        // Assume the default COV for now, EmitDirectiveAMDHSACodeObjectVersion
        // will update this if it is encountered.
        CodeObjectVersion(AMDGPU::getDefaultAMDHSACodeObjectVersion()) {}
 
  AMDGPUPALMetadata *getPALMetadata() { return &PALMetadata; }
 
  virtual void EmitDirectiveAMDGCNTarget(){};
 
  virtual void EmitDirectiveAMDHSACodeObjectVersion(unsigned COV) {
    CodeObjectVersion = COV;
  }
 
  virtual void EmitAMDKernelCodeT(const amd_kernel_code_t &Header){};
 
  virtual void EmitAMDGPUSymbolType(StringRef SymbolName, unsigned Type){};
 
  virtual void emitAMDGPULDS(MCSymbol *Symbol, unsigned Size, Align Alignment) {
  }
 
  /// \returns True on success, false on failure.
  virtual bool EmitISAVersion() { return true; }
 
  /// \returns True on success, false on failure.
  virtual bool EmitHSAMetadataV3(StringRef HSAMetadataString);
 
  /// Emit HSA Metadata
  ///
  /// When \p Strict is true, known metadata elements must already be
  /// well-typed. When \p Strict is false, known types are inferred and
  /// the \p HSAMetadata structure is updated with the correct types.
  ///
  /// \returns True on success, false on failure.
  virtual bool EmitHSAMetadata(msgpack::Document &HSAMetadata, bool Strict) {
    return true;
  }
 
  /// \returns True on success, false on failure.
  virtual bool EmitHSAMetadata(const AMDGPU::HSAMD::Metadata &HSAMetadata) {
    return true;
  }
 
  /// \returns True on success, false on failure.
  virtual bool EmitCodeEnd(const MCSubtargetInfo &STI) { return true; }
 
  /// \returns True on success, false on failure.
  virtual bool EmitKernargPreloadHeader(const MCSubtargetInfo &STI,
                                        bool TrapEnabled) {
    return true;
  }
 
  virtual void
  EmitAmdhsaKernelDescriptor(const MCSubtargetInfo &STI, StringRef KernelName,
                             const AMDGPU::MCKernelDescriptor &KernelDescriptor,
                             uint64_t NextVGPR, uint64_t NextSGPR,
                             bool ReserveVCC, bool ReserveFlatScr) {}
 
  static StringRef getArchNameFromElfMach(unsigned ElfMach);
  static unsigned getElfMach(StringRef GPU);
 
  const std::optional<AMDGPU::IsaInfo::AMDGPUTargetID> &getTargetID() const {
    return TargetID;
  }
  std::optional<AMDGPU::IsaInfo::AMDGPUTargetID> &getTargetID() {
    return TargetID;
  }
  void initializeTargetID(const MCSubtargetInfo &STI) {
    assert(TargetID == std::nullopt && "TargetID can only be initialized once");
    TargetID.emplace(STI);
  }
  void initializeTargetID(const MCSubtargetInfo &STI, StringRef FeatureString) {
    initializeTargetID(STI);
 
    assert(getTargetID() != std::nullopt && "TargetID is None");
    getTargetID()->setTargetIDFromFeaturesString(FeatureString);
  }
};
 
class AMDGPUTargetAsmStreamer final : public AMDGPUTargetStreamer {
  formatted_raw_ostream &OS;
public:
  AMDGPUTargetAsmStreamer(MCStreamer &S, formatted_raw_ostream &OS);
 
  void finish() override;
 
  void EmitDirectiveAMDGCNTarget() override;
 
  void EmitDirectiveAMDHSACodeObjectVersion(unsigned COV) override;
 
  void EmitAMDKernelCodeT(const amd_kernel_code_t &Header) override;
 
  void EmitAMDGPUSymbolType(StringRef SymbolName, unsigned Type) override;
 
  void emitAMDGPULDS(MCSymbol *Sym, unsigned Size, Align Alignment) override;
 
  /// \returns True on success, false on failure.
  bool EmitISAVersion() override;
 
  /// \returns True on success, false on failure.
  bool EmitHSAMetadata(msgpack::Document &HSAMetadata, bool Strict) override;
 
  /// \returns True on success, false on failure.
  bool EmitCodeEnd(const MCSubtargetInfo &STI) override;
 
  /// \returns True on success, false on failure.
  bool EmitKernargPreloadHeader(const MCSubtargetInfo &STI,
                                bool TrapEnabled) override;
 
  void
  EmitAmdhsaKernelDescriptor(const MCSubtargetInfo &STI, StringRef KernelName,
                             const AMDGPU::MCKernelDescriptor &KernelDescriptor,
                             uint64_t NextVGPR, uint64_t NextSGPR,
                             bool ReserveVCC, bool ReserveFlatScr) override;
};
 
class AMDGPUTargetELFStreamer final : public AMDGPUTargetStreamer {
  const MCSubtargetInfo &STI;
  MCStreamer &Streamer;
 
  void EmitNote(StringRef Name, const MCExpr *DescSize, unsigned NoteType,
                function_ref<void(MCELFStreamer &)> EmitDesc);
 
  unsigned getEFlags();
 
  unsigned getEFlagsR600();
  unsigned getEFlagsAMDGCN();
 
  unsigned getEFlagsUnknownOS();
  unsigned getEFlagsAMDHSA();
  unsigned getEFlagsAMDPAL();
  unsigned getEFlagsMesa3D();
 
  unsigned getEFlagsV3();
  unsigned getEFlagsV4();
  unsigned getEFlagsV6();
 
public:
  AMDGPUTargetELFStreamer(MCStreamer &S, const MCSubtargetInfo &STI);
 
  MCELFStreamer &getStreamer();
 
  void finish() override;
 
  void EmitDirectiveAMDGCNTarget() override;
 
  void EmitAMDKernelCodeT(const amd_kernel_code_t &Header) override;
 
  void EmitAMDGPUSymbolType(StringRef SymbolName, unsigned Type) override;
 
  void emitAMDGPULDS(MCSymbol *Sym, unsigned Size, Align Alignment) override;
 
  /// \returns True on success, false on failure.
  bool EmitISAVersion() override;
 
  /// \returns True on success, false on failure.
  bool EmitHSAMetadata(msgpack::Document &HSAMetadata, bool Strict) override;
 
  /// \returns True on success, false on failure.
  bool EmitCodeEnd(const MCSubtargetInfo &STI) override;
 
  /// \returns True on success, false on failure.
  bool EmitKernargPreloadHeader(const MCSubtargetInfo &STI,
                                bool TrapEnabled) override;
 
  void
  EmitAmdhsaKernelDescriptor(const MCSubtargetInfo &STI, StringRef KernelName,
                             const AMDGPU::MCKernelDescriptor &KernelDescriptor,
                             uint64_t NextVGPR, uint64_t NextSGPR,
                             bool ReserveVCC, bool ReserveFlatScr) override;
};
}
#endif