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annotate lib/CodeGen/AsmPrinter/ErlangGCPrinter.cpp @ 0:95c75e76d11b LLVM3.4

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LLVM 3.4
author Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
date Thu, 12 Dec 2013 13:56:28 +0900
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children 54457678186b
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1 //===-- ErlangGCPrinter.cpp - Erlang/OTP frametable emitter -----*- C++ -*-===//
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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 implements the compiler plugin that is used in order to emit
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11 // garbage collection information in a convenient layout for parsing and
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12 // loading in the Erlang/OTP runtime.
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13 //
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14 //===----------------------------------------------------------------------===//
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15
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16 #include "llvm/CodeGen/AsmPrinter.h"
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17 #include "llvm/CodeGen/GCs.h"
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18 #include "llvm/CodeGen/GCMetadataPrinter.h"
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19 #include "llvm/IR/DataLayout.h"
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20 #include "llvm/IR/Function.h"
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21 #include "llvm/IR/Instruction.h"
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22 #include "llvm/IR/IntrinsicInst.h"
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23 #include "llvm/IR/Metadata.h"
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24 #include "llvm/MC/MCAsmInfo.h"
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25 #include "llvm/MC/MCContext.h"
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26 #include "llvm/MC/MCSectionELF.h"
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27 #include "llvm/MC/MCStreamer.h"
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28 #include "llvm/MC/MCSymbol.h"
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29 #include "llvm/Target/TargetLoweringObjectFile.h"
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30 #include "llvm/Target/TargetMachine.h"
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31
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32 using namespace llvm;
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33
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34 namespace {
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35
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36 class ErlangGCPrinter : public GCMetadataPrinter {
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37 public:
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38 void beginAssembly(AsmPrinter &AP);
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39 void finishAssembly(AsmPrinter &AP);
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40 };
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41
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42 }
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43
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44 static GCMetadataPrinterRegistry::Add<ErlangGCPrinter>
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45 X("erlang", "erlang-compatible garbage collector");
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46
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47 void llvm::linkErlangGCPrinter() { }
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48
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49 void ErlangGCPrinter::beginAssembly(AsmPrinter &AP) { }
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50
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51 void ErlangGCPrinter::finishAssembly(AsmPrinter &AP) {
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52 MCStreamer &OS = AP.OutStreamer;
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53 unsigned IntPtrSize = AP.TM.getDataLayout()->getPointerSize();
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54
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55 // Put this in a custom .note section.
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56 AP.OutStreamer.SwitchSection(AP.getObjFileLowering().getContext()
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57 .getELFSection(".note.gc", ELF::SHT_PROGBITS, 0,
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58 SectionKind::getDataRel()));
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59
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60 // For each function...
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61 for (iterator FI = begin(), FE = end(); FI != FE; ++FI) {
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62 GCFunctionInfo &MD = **FI;
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63
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64 /** A compact GC layout. Emit this data structure:
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65 *
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66 * struct {
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67 * int16_t PointCount;
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68 * void *SafePointAddress[PointCount];
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69 * int16_t StackFrameSize; (in words)
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70 * int16_t StackArity;
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71 * int16_t LiveCount;
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72 * int16_t LiveOffsets[LiveCount];
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73 * } __gcmap_<FUNCTIONNAME>;
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74 **/
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75
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76 // Align to address width.
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77 AP.EmitAlignment(IntPtrSize == 4 ? 2 : 3);
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78
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79 // Emit PointCount.
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80 OS.AddComment("safe point count");
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81 AP.EmitInt16(MD.size());
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82
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83 // And each safe point...
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84 for (GCFunctionInfo::iterator PI = MD.begin(), PE = MD.end(); PI != PE;
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85 ++PI) {
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86 // Emit the address of the safe point.
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87 OS.AddComment("safe point address");
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88 MCSymbol *Label = PI->Label;
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89 AP.EmitLabelPlusOffset(Label/*Hi*/, 0/*Offset*/, 4/*Size*/);
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90 }
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91
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92 // Stack information never change in safe points! Only print info from the
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93 // first call-site.
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94 GCFunctionInfo::iterator PI = MD.begin();
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95
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96 // Emit the stack frame size.
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97 OS.AddComment("stack frame size (in words)");
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98 AP.EmitInt16(MD.getFrameSize() / IntPtrSize);
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99
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100 // Emit stack arity, i.e. the number of stacked arguments.
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101 unsigned RegisteredArgs = IntPtrSize == 4 ? 5 : 6;
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102 unsigned StackArity = MD.getFunction().arg_size() > RegisteredArgs ?
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103 MD.getFunction().arg_size() - RegisteredArgs : 0;
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104 OS.AddComment("stack arity");
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105 AP.EmitInt16(StackArity);
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106
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107 // Emit the number of live roots in the function.
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108 OS.AddComment("live root count");
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109 AP.EmitInt16(MD.live_size(PI));
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110
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111 // And for each live root...
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112 for (GCFunctionInfo::live_iterator LI = MD.live_begin(PI),
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113 LE = MD.live_end(PI);
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114 LI != LE; ++LI) {
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115 // Emit live root's offset within the stack frame.
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116 OS.AddComment("stack index (offset / wordsize)");
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117 AP.EmitInt16(LI->StackOffset / IntPtrSize);
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118 }
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119 }
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120 }