1 //===-- AMDGPUAsmPrinter.h - Print AMDGPU assembly code ---------*- C++ -*-===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 //
9 /// \file
10 /// AMDGPU Assembly printer class.
11 //
12 //===----------------------------------------------------------------------===//
13 
14 #ifndef LLVM_LIB_TARGET_AMDGPU_AMDGPUASMPRINTER_H
15 #define LLVM_LIB_TARGET_AMDGPU_AMDGPUASMPRINTER_H
16 
17 #include "AMDGPU.h"
18 #include "AMDKernelCodeT.h"
19 #include "AMDGPUHSAMetadataStreamer.h"
20 #include "SIProgramInfo.h"
21 #include "llvm/ADT/StringRef.h"
22 #include "llvm/CodeGen/AsmPrinter.h"
23 #include "llvm/Support/AMDHSAKernelDescriptor.h"
24 #include <cstddef>
25 #include <cstdint>
26 #include <limits>
27 #include <memory>
28 #include <string>
29 #include <vector>
30 
31 namespace llvm {
32 
33 class AMDGPUMachineFunction;
34 class AMDGPUTargetStreamer;
35 class MCOperand;
36 class GCNSubtarget;
37 
38 class AMDGPUAsmPrinter final : public AsmPrinter {
39 private:
40   // Track resource usage for callee functions.
41   struct SIFunctionResourceInfo {
42     // Track the number of explicitly used VGPRs. Special registers reserved at
43     // the end are tracked separately.
44     int32_t NumVGPR = 0;
45     int32_t NumExplicitSGPR = 0;
46     uint64_t PrivateSegmentSize = 0;
47     bool UsesVCC = false;
48     bool UsesFlatScratch = false;
49     bool HasDynamicallySizedStack = false;
50     bool HasRecursion = false;
51 
52     int32_t getTotalNumSGPRs(const GCNSubtarget &ST) const;
53   };
54 
55   SIProgramInfo CurrentProgramInfo;
56   DenseMap<const Function *, SIFunctionResourceInfo> CallGraphResourceInfo;
57 
58   std::unique_ptr<AMDGPU::HSAMD::MetadataStreamer> HSAMetadataStream;
59 
60   uint64_t getFunctionCodeSize(const MachineFunction &MF) const;
61   SIFunctionResourceInfo analyzeResourceUsage(const MachineFunction &MF) const;
62 
63   void getSIProgramInfo(SIProgramInfo &Out, const MachineFunction &MF);
64   void getAmdKernelCode(amd_kernel_code_t &Out, const SIProgramInfo &KernelInfo,
65                         const MachineFunction &MF) const;
66   void findNumUsedRegistersSI(const MachineFunction &MF,
67                               unsigned &NumSGPR,
68                               unsigned &NumVGPR) const;
69 
70   /// Emit register usage information so that the GPU driver
71   /// can correctly setup the GPU state.
72   void EmitProgramInfoSI(const MachineFunction &MF,
73                          const SIProgramInfo &KernelInfo);
74   void EmitPALMetadata(const MachineFunction &MF,
75                        const SIProgramInfo &KernelInfo);
76   void emitCommonFunctionComments(uint32_t NumVGPR,
77                                   uint32_t NumSGPR,
78                                   uint64_t ScratchSize,
79                                   uint64_t CodeSize,
80                                   const AMDGPUMachineFunction* MFI);
81 
82   uint16_t getAmdhsaKernelCodeProperties(
83       const MachineFunction &MF) const;
84 
85   amdhsa::kernel_descriptor_t getAmdhsaKernelDescriptor(
86       const MachineFunction &MF,
87       const SIProgramInfo &PI) const;
88 
89 public:
90   explicit AMDGPUAsmPrinter(TargetMachine &TM,
91                             std::unique_ptr<MCStreamer> Streamer);
92 
93   StringRef getPassName() const override;
94 
95   const MCSubtargetInfo* getGlobalSTI() const;
96 
97   AMDGPUTargetStreamer* getTargetStreamer() const;
98 
99   bool doFinalization(Module &M) override;
100   bool runOnMachineFunction(MachineFunction &MF) override;
101 
102   /// Wrapper for MCInstLowering.lowerOperand() for the tblgen'erated
103   /// pseudo lowering.
104   bool lowerOperand(const MachineOperand &MO, MCOperand &MCOp) const;
105 
106   /// Lower the specified LLVM Constant to an MCExpr.
107   /// The AsmPrinter::lowerConstantof does not know how to lower
108   /// addrspacecast, therefore they should be lowered by this function.
109   const MCExpr *lowerConstant(const Constant *CV) override;
110 
111   /// tblgen'erated driver function for lowering simple MI->MC pseudo
112   /// instructions.
113   bool emitPseudoExpansionLowering(MCStreamer &OutStreamer,
114                                    const MachineInstr *MI);
115 
116   /// Implemented in AMDGPUMCInstLower.cpp
117   void EmitInstruction(const MachineInstr *MI) override;
118 
119   void EmitFunctionBodyStart() override;
120 
121   void EmitFunctionBodyEnd() override;
122 
123   void EmitFunctionEntryLabel() override;
124 
125   void EmitBasicBlockStart(const MachineBasicBlock &MBB) const override;
126 
127   void EmitGlobalVariable(const GlobalVariable *GV) override;
128 
129   void EmitStartOfAsmFile(Module &M) override;
130 
131   void EmitEndOfAsmFile(Module &M) override;
132 
133   bool isBlockOnlyReachableByFallthrough(
134     const MachineBasicBlock *MBB) const override;
135 
136   bool PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
137                        unsigned AsmVariant, const char *ExtraCode,
138                        raw_ostream &O) override;
139 
140 protected:
141   mutable std::vector<std::string> DisasmLines, HexLines;
142   mutable size_t DisasmLineMaxLen;
143 };
144 
145 } // end namespace llvm
146 
147 #endif // LLVM_LIB_TARGET_AMDGPU_AMDGPUASMPRINTER_H
148