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annotate lib/CodeGen/AsmPrinter/OcamlGCPrinter.cpp @ 77:54457678186b LLVM3.6

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LLVM 3.6
author Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
date Mon, 08 Sep 2014 22:06:00 +0900
parents 95c75e76d11b
children 60c9769439b8
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1 //===-- OcamlGCPrinter.cpp - Ocaml frametable emitter ---------------------===//
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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 printing the assembly code for an Ocaml frametable.
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11 //
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12 //===----------------------------------------------------------------------===//
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13
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14 #include "llvm/CodeGen/GCs.h"
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15 #include "llvm/ADT/SmallString.h"
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16 #include "llvm/CodeGen/AsmPrinter.h"
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17 #include "llvm/CodeGen/GCMetadataPrinter.h"
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18 #include "llvm/IR/DataLayout.h"
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19 #include "llvm/IR/Mangler.h"
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20 #include "llvm/IR/Module.h"
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21 #include "llvm/MC/MCAsmInfo.h"
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22 #include "llvm/MC/MCContext.h"
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23 #include "llvm/MC/MCStreamer.h"
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24 #include "llvm/MC/MCSymbol.h"
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25 #include "llvm/Support/ErrorHandling.h"
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26 #include "llvm/Support/FormattedStream.h"
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27 #include "llvm/Target/TargetLoweringObjectFile.h"
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28 #include "llvm/Target/TargetMachine.h"
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29 #include "llvm/Target/TargetSubtargetInfo.h"
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30 #include <cctype>
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31 using namespace llvm;
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32
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33 namespace {
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34
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35 class OcamlGCMetadataPrinter : public GCMetadataPrinter {
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36 public:
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37 void beginAssembly(AsmPrinter &AP) override;
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38 void finishAssembly(AsmPrinter &AP) override;
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39 };
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40
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41 }
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42
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43 static GCMetadataPrinterRegistry::Add<OcamlGCMetadataPrinter>
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44 Y("ocaml", "ocaml 3.10-compatible collector");
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45
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46 void llvm::linkOcamlGCPrinter() { }
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47
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48 static void EmitCamlGlobal(const Module &M, AsmPrinter &AP, const char *Id) {
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49 const std::string &MId = M.getModuleIdentifier();
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50
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51 std::string SymName;
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52 SymName += "caml";
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53 size_t Letter = SymName.size();
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54 SymName.append(MId.begin(), std::find(MId.begin(), MId.end(), '.'));
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55 SymName += "__";
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56 SymName += Id;
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57
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58 // Capitalize the first letter of the module name.
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59 SymName[Letter] = toupper(SymName[Letter]);
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60
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61 SmallString<128> TmpStr;
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62 AP.Mang->getNameWithPrefix(TmpStr, SymName);
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63
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64 MCSymbol *Sym = AP.OutContext.GetOrCreateSymbol(TmpStr);
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65
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66 AP.OutStreamer.EmitSymbolAttribute(Sym, MCSA_Global);
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67 AP.OutStreamer.EmitLabel(Sym);
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68 }
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69
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70 void OcamlGCMetadataPrinter::beginAssembly(AsmPrinter &AP) {
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71 AP.OutStreamer.SwitchSection(AP.getObjFileLowering().getTextSection());
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72 EmitCamlGlobal(getModule(), AP, "code_begin");
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73
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74 AP.OutStreamer.SwitchSection(AP.getObjFileLowering().getDataSection());
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75 EmitCamlGlobal(getModule(), AP, "data_begin");
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76 }
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77
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78 /// emitAssembly - Print the frametable. The ocaml frametable format is thus:
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79 ///
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80 /// extern "C" struct align(sizeof(intptr_t)) {
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81 /// uint16_t NumDescriptors;
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82 /// struct align(sizeof(intptr_t)) {
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83 /// void *ReturnAddress;
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84 /// uint16_t FrameSize;
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85 /// uint16_t NumLiveOffsets;
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86 /// uint16_t LiveOffsets[NumLiveOffsets];
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87 /// } Descriptors[NumDescriptors];
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88 /// } caml${module}__frametable;
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89 ///
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90 /// Note that this precludes programs from stack frames larger than 64K
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91 /// (FrameSize and LiveOffsets would overflow). FrameTablePrinter will abort if
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92 /// either condition is detected in a function which uses the GC.
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93 ///
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94 void OcamlGCMetadataPrinter::finishAssembly(AsmPrinter &AP) {
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95 unsigned IntPtrSize =
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96 AP.TM.getSubtargetImpl()->getDataLayout()->getPointerSize();
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97
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98 AP.OutStreamer.SwitchSection(AP.getObjFileLowering().getTextSection());
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99 EmitCamlGlobal(getModule(), AP, "code_end");
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100
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101 AP.OutStreamer.SwitchSection(AP.getObjFileLowering().getDataSection());
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102 EmitCamlGlobal(getModule(), AP, "data_end");
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103
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104 // FIXME: Why does ocaml emit this??
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105 AP.OutStreamer.EmitIntValue(0, IntPtrSize);
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106
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107 AP.OutStreamer.SwitchSection(AP.getObjFileLowering().getDataSection());
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108 EmitCamlGlobal(getModule(), AP, "frametable");
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109
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110 int NumDescriptors = 0;
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111 for (iterator I = begin(), IE = end(); I != IE; ++I) {
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112 GCFunctionInfo &FI = **I;
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113 for (GCFunctionInfo::iterator J = FI.begin(), JE = FI.end(); J != JE; ++J) {
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114 NumDescriptors++;
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115 }
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116 }
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117
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118 if (NumDescriptors >= 1<<16) {
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119 // Very rude!
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120 report_fatal_error(" Too much descriptor for ocaml GC");
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121 }
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122 AP.EmitInt16(NumDescriptors);
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123 AP.EmitAlignment(IntPtrSize == 4 ? 2 : 3);
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124
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125 for (iterator I = begin(), IE = end(); I != IE; ++I) {
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126 GCFunctionInfo &FI = **I;
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127
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128 uint64_t FrameSize = FI.getFrameSize();
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
129 if (FrameSize >= 1<<16) {
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
130 // Very rude!
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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diff changeset
131 report_fatal_error("Function '" + FI.getFunction().getName() +
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
132 "' is too large for the ocaml GC! "
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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133 "Frame size " + Twine(FrameSize) + ">= 65536.\n"
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
134 "(" + Twine(uintptr_t(&FI)) + ")");
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
135 }
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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diff changeset
136
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
137 AP.OutStreamer.AddComment("live roots for " +
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
138 Twine(FI.getFunction().getName()));
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
139 AP.OutStreamer.AddBlankLine();
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
140
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
141 for (GCFunctionInfo::iterator J = FI.begin(), JE = FI.end(); J != JE; ++J) {
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
142 size_t LiveCount = FI.live_size(J);
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
143 if (LiveCount >= 1<<16) {
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
144 // Very rude!
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
145 report_fatal_error("Function '" + FI.getFunction().getName() +
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
146 "' is too large for the ocaml GC! "
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
147 "Live root count "+Twine(LiveCount)+" >= 65536.");
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
148 }
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
149
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
150 AP.OutStreamer.EmitSymbolValue(J->Label, IntPtrSize);
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
151 AP.EmitInt16(FrameSize);
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
152 AP.EmitInt16(LiveCount);
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
153
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
154 for (GCFunctionInfo::live_iterator K = FI.live_begin(J),
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
155 KE = FI.live_end(J); K != KE; ++K) {
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
156 if (K->StackOffset >= 1<<16) {
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
157 // Very rude!
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
158 report_fatal_error(
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
159 "GC root stack offset is outside of fixed stack frame and out "
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
160 "of range for ocaml GC!");
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
161 }
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
162 AP.EmitInt16(K->StackOffset);
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
163 }
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
164
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
165 AP.EmitAlignment(IntPtrSize == 4 ? 2 : 3);
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
166 }
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
167 }
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
168 }