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annotate lib/Target/NVPTX/NVPTXPrologEpilogPass.cpp @ 131:f476a9ba4795

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http://llvm.org/svn/llvm-project/compiler-rt/trunk compiler-rt
author mir3636
date Fri, 16 Feb 2018 21:02:11 +0900
parents 1172e4bd9c6f
children 3a76565eade5
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1 //===-- NVPTXPrologEpilogPass.cpp - NVPTX prolog/epilog inserter ----------===//
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2 //
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3 // The LLVM Compiler Infrastructure
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4 //
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5 // This file is distributed under the University of Illinois Open Source
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6 // License. See LICENSE.TXT for details.
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7 //
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8 //===----------------------------------------------------------------------===//
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9 //
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10 // This file is a copy of the generic LLVM PrologEpilogInserter pass, modified
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11 // to remove unneeded functionality and to handle virtual registers. Most code
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12 // here is a copy of PrologEpilogInserter.cpp.
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13 //
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14 //===----------------------------------------------------------------------===//
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15
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16 #include "NVPTX.h"
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17 #include "llvm/CodeGen/MachineFrameInfo.h"
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18 #include "llvm/CodeGen/MachineFunction.h"
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19 #include "llvm/CodeGen/MachineFunctionPass.h"
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20 #include "llvm/Pass.h"
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21 #include "llvm/Support/Debug.h"
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22 #include "llvm/Support/raw_ostream.h"
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23 #include "llvm/Target/TargetFrameLowering.h"
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24 #include "llvm/Target/TargetRegisterInfo.h"
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25 #include "llvm/Target/TargetSubtargetInfo.h"
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26
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27 using namespace llvm;
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28
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29 #define DEBUG_TYPE "nvptx-prolog-epilog"
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30
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31 namespace {
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32 class NVPTXPrologEpilogPass : public MachineFunctionPass {
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33 public:
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34 static char ID;
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35 NVPTXPrologEpilogPass() : MachineFunctionPass(ID) {}
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36
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37 bool runOnMachineFunction(MachineFunction &MF) override;
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38
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39 private:
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40 void calculateFrameObjectOffsets(MachineFunction &Fn);
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41 };
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42 }
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43
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44 MachineFunctionPass *llvm::createNVPTXPrologEpilogPass() {
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45 return new NVPTXPrologEpilogPass();
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46 }
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47
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48 char NVPTXPrologEpilogPass::ID = 0;
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49
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50 bool NVPTXPrologEpilogPass::runOnMachineFunction(MachineFunction &MF) {
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51 const TargetSubtargetInfo &STI = MF.getSubtarget();
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52 const TargetFrameLowering &TFI = *STI.getFrameLowering();
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53 const TargetRegisterInfo &TRI = *STI.getRegisterInfo();
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54 bool Modified = false;
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55
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56 calculateFrameObjectOffsets(MF);
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57
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58 for (MachineBasicBlock &MBB : MF) {
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59 for (MachineInstr &MI : MBB) {
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60 for (unsigned i = 0, e = MI.getNumOperands(); i != e; ++i) {
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61 if (!MI.getOperand(i).isFI())
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62 continue;
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63 TRI.eliminateFrameIndex(MI, 0, i, nullptr);
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64 Modified = true;
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65 }
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66 }
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67 }
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68
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69 // Add function prolog/epilog
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70 TFI.emitPrologue(MF, MF.front());
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71
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72 for (MachineFunction::iterator I = MF.begin(), E = MF.end(); I != E; ++I) {
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73 // If last instruction is a return instruction, add an epilogue
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74 if (I->isReturnBlock())
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75 TFI.emitEpilogue(MF, *I);
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76 }
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77
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78 return Modified;
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79 }
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80
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81 /// AdjustStackOffset - Helper function used to adjust the stack frame offset.
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82 static inline void
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83 AdjustStackOffset(MachineFrameInfo &MFI, int FrameIdx,
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84 bool StackGrowsDown, int64_t &Offset,
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85 unsigned &MaxAlign) {
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86 // If the stack grows down, add the object size to find the lowest address.
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87 if (StackGrowsDown)
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88 Offset += MFI.getObjectSize(FrameIdx);
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89
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90 unsigned Align = MFI.getObjectAlignment(FrameIdx);
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91
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92 // If the alignment of this object is greater than that of the stack, then
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93 // increase the stack alignment to match.
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94 MaxAlign = std::max(MaxAlign, Align);
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95
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96 // Adjust to alignment boundary.
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97 Offset = (Offset + Align - 1) / Align * Align;
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98
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99 if (StackGrowsDown) {
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100 DEBUG(dbgs() << "alloc FI(" << FrameIdx << ") at SP[" << -Offset << "]\n");
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101 MFI.setObjectOffset(FrameIdx, -Offset); // Set the computed offset
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102 } else {
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103 DEBUG(dbgs() << "alloc FI(" << FrameIdx << ") at SP[" << Offset << "]\n");
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104 MFI.setObjectOffset(FrameIdx, Offset);
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105 Offset += MFI.getObjectSize(FrameIdx);
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106 }
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107 }
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108
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109 void
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110 NVPTXPrologEpilogPass::calculateFrameObjectOffsets(MachineFunction &Fn) {
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111 const TargetFrameLowering &TFI = *Fn.getSubtarget().getFrameLowering();
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112 const TargetRegisterInfo *RegInfo = Fn.getSubtarget().getRegisterInfo();
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113
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114 bool StackGrowsDown =
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115 TFI.getStackGrowthDirection() == TargetFrameLowering::StackGrowsDown;
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116
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117 // Loop over all of the stack objects, assigning sequential addresses...
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118 MachineFrameInfo &MFI = Fn.getFrameInfo();
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119
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120 // Start at the beginning of the local area.
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121 // The Offset is the distance from the stack top in the direction
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122 // of stack growth -- so it's always nonnegative.
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123 int LocalAreaOffset = TFI.getOffsetOfLocalArea();
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124 if (StackGrowsDown)
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125 LocalAreaOffset = -LocalAreaOffset;
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126 assert(LocalAreaOffset >= 0
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127 && "Local area offset should be in direction of stack growth");
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128 int64_t Offset = LocalAreaOffset;
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129
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130 // If there are fixed sized objects that are preallocated in the local area,
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131 // non-fixed objects can't be allocated right at the start of local area.
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132 // We currently don't support filling in holes in between fixed sized
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133 // objects, so we adjust 'Offset' to point to the end of last fixed sized
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134 // preallocated object.
120
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135 for (int i = MFI.getObjectIndexBegin(); i != 0; ++i) {
0
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136 int64_t FixedOff;
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137 if (StackGrowsDown) {
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138 // The maximum distance from the stack pointer is at lower address of
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139 // the object -- which is given by offset. For down growing stack
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140 // the offset is negative, so we negate the offset to get the distance.
120
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141 FixedOff = -MFI.getObjectOffset(i);
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142 } else {
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143 // The maximum distance from the start pointer is at the upper
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144 // address of the object.
120
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145 FixedOff = MFI.getObjectOffset(i) + MFI.getObjectSize(i);
0
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146 }
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147 if (FixedOff > Offset) Offset = FixedOff;
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148 }
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149
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150 // NOTE: We do not have a call stack
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151
120
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152 unsigned MaxAlign = MFI.getMaxAlignment();
0
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153
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154 // No scavenger
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155
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156 // FIXME: Once this is working, then enable flag will change to a target
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157 // check for whether the frame is large enough to want to use virtual
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158 // frame index registers. Functions which don't want/need this optimization
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159 // will continue to use the existing code path.
120
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160 if (MFI.getUseLocalStackAllocationBlock()) {
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161 unsigned Align = MFI.getLocalFrameMaxAlign();
0
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162
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163 // Adjust to alignment boundary.
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164 Offset = (Offset + Align - 1) / Align * Align;
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165
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166 DEBUG(dbgs() << "Local frame base offset: " << Offset << "\n");
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167
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168 // Resolve offsets for objects in the local block.
120
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169 for (unsigned i = 0, e = MFI.getLocalFrameObjectCount(); i != e; ++i) {
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170 std::pair<int, int64_t> Entry = MFI.getLocalFrameObjectMap(i);
0
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171 int64_t FIOffset = (StackGrowsDown ? -Offset : Offset) + Entry.second;
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172 DEBUG(dbgs() << "alloc FI(" << Entry.first << ") at SP[" <<
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173 FIOffset << "]\n");
120
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174 MFI.setObjectOffset(Entry.first, FIOffset);
0
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175 }
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176 // Allocate the local block
120
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177 Offset += MFI.getLocalFrameSize();
0
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178
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179 MaxAlign = std::max(Align, MaxAlign);
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180 }
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181
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182 // No stack protector
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183
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184 // Then assign frame offsets to stack objects that are not used to spill
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185 // callee saved registers.
120
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186 for (unsigned i = 0, e = MFI.getObjectIndexEnd(); i != e; ++i) {
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187 if (MFI.isObjectPreAllocated(i) &&
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188 MFI.getUseLocalStackAllocationBlock())
0
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189 continue;
120
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190 if (MFI.isDeadObjectIndex(i))
0
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191 continue;
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192
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193 AdjustStackOffset(MFI, i, StackGrowsDown, Offset, MaxAlign);
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194 }
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195
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196 // No scavenger
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197
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198 if (!TFI.targetHandlesStackFrameRounding()) {
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199 // If we have reserved argument space for call sites in the function
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200 // immediately on entry to the current function, count it as part of the
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201 // overall stack size.
120
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202 if (MFI.adjustsStack() && TFI.hasReservedCallFrame(Fn))
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203 Offset += MFI.getMaxCallFrameSize();
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204
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205 // Round up the size to a multiple of the alignment. If the function has
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206 // any calls or alloca's, align to the target's StackAlignment value to
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207 // ensure that the callee's frame or the alloca data is suitably aligned;
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208 // otherwise, for leaf functions, align to the TransientStackAlignment
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209 // value.
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210 unsigned StackAlign;
120
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211 if (MFI.adjustsStack() || MFI.hasVarSizedObjects() ||
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212 (RegInfo->needsStackRealignment(Fn) && MFI.getObjectIndexEnd() != 0))
0
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213 StackAlign = TFI.getStackAlignment();
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214 else
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215 StackAlign = TFI.getTransientStackAlignment();
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216
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217 // If the frame pointer is eliminated, all frame offsets will be relative to
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218 // SP not FP. Align to MaxAlign so this works.
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219 StackAlign = std::max(StackAlign, MaxAlign);
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220 unsigned AlignMask = StackAlign - 1;
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221 Offset = (Offset + AlignMask) & ~uint64_t(AlignMask);
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222 }
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223
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224 // Update frame info to pretend that this is part of the stack...
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225 int64_t StackSize = Offset - LocalAreaOffset;
120
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226 MFI.setStackSize(StackSize);
0
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227 }