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annotate lib/Support/StreamableMemoryObject.cpp @ 21:fc4a6333556f

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change error message when tail call elimination is failed.
author Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
date Mon, 14 Oct 2013 19:09:00 +0900
parents 9ad51c7bc036
children
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1 //===- StreamableMemoryObject.cpp - Streamable data interface -------------===//
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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 #include "llvm/Support/StreamableMemoryObject.h"
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11 #include "llvm/Support/Compiler.h"
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12 #include <cassert>
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13 #include <cstring>
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15
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16 using namespace llvm;
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17
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18 namespace {
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19
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20 class RawMemoryObject : public StreamableMemoryObject {
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21 public:
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22 RawMemoryObject(const unsigned char *Start, const unsigned char *End) :
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23 FirstChar(Start), LastChar(End) {
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24 assert(LastChar >= FirstChar && "Invalid start/end range");
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25 }
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26
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27 virtual uint64_t getBase() const LLVM_OVERRIDE { return 0; }
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28 virtual uint64_t getExtent() const LLVM_OVERRIDE {
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29 return LastChar - FirstChar;
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30 }
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31 virtual int readByte(uint64_t address, uint8_t* ptr) const LLVM_OVERRIDE;
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32 virtual int readBytes(uint64_t address,
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33 uint64_t size,
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34 uint8_t* buf,
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35 uint64_t* copied) const LLVM_OVERRIDE;
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36 virtual const uint8_t *getPointer(uint64_t address,
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37 uint64_t size) const LLVM_OVERRIDE;
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38 virtual bool isValidAddress(uint64_t address) const LLVM_OVERRIDE {
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39 return validAddress(address);
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40 }
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41 virtual bool isObjectEnd(uint64_t address) const LLVM_OVERRIDE {
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42 return objectEnd(address);
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43 }
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44
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45 private:
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46 const uint8_t* const FirstChar;
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47 const uint8_t* const LastChar;
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48
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49 // These are implemented as inline functions here to avoid multiple virtual
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50 // calls per public function
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51 bool validAddress(uint64_t address) const {
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52 return static_cast<ptrdiff_t>(address) < LastChar - FirstChar;
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53 }
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54 bool objectEnd(uint64_t address) const {
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55 return static_cast<ptrdiff_t>(address) == LastChar - FirstChar;
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56 }
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57
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58 RawMemoryObject(const RawMemoryObject&) LLVM_DELETED_FUNCTION;
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59 void operator=(const RawMemoryObject&) LLVM_DELETED_FUNCTION;
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60 };
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61
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62 int RawMemoryObject::readByte(uint64_t address, uint8_t* ptr) const {
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63 if (!validAddress(address)) return -1;
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64 *ptr = *((uint8_t *)(uintptr_t)(address + FirstChar));
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65 return 0;
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66 }
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67
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68 int RawMemoryObject::readBytes(uint64_t address,
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69 uint64_t size,
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70 uint8_t* buf,
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71 uint64_t* copied) const {
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72 if (!validAddress(address) || !validAddress(address + size - 1)) return -1;
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73 memcpy(buf, (uint8_t *)(uintptr_t)(address + FirstChar), size);
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74 if (copied) *copied = size;
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75 return size;
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76 }
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77
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78 const uint8_t *RawMemoryObject::getPointer(uint64_t address,
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79 uint64_t size) const {
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80 return FirstChar + address;
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81 }
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82 } // anonymous namespace
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83
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84 namespace llvm {
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85 // If the bitcode has a header, then its size is known, and we don't have to
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86 // block until we actually want to read it.
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87 bool StreamingMemoryObject::isValidAddress(uint64_t address) const {
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88 if (ObjectSize && address < ObjectSize) return true;
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89 return fetchToPos(address);
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90 }
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91
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92 bool StreamingMemoryObject::isObjectEnd(uint64_t address) const {
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93 if (ObjectSize) return address == ObjectSize;
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94 fetchToPos(address);
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95 return address == ObjectSize && address != 0;
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96 }
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97
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98 uint64_t StreamingMemoryObject::getExtent() const {
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99 if (ObjectSize) return ObjectSize;
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100 size_t pos = BytesRead + kChunkSize;
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101 // keep fetching until we run out of bytes
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102 while (fetchToPos(pos)) pos += kChunkSize;
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103 return ObjectSize;
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104 }
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105
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106 int StreamingMemoryObject::readByte(uint64_t address, uint8_t* ptr) const {
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107 if (!fetchToPos(address)) return -1;
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108 *ptr = Bytes[address + BytesSkipped];
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109 return 0;
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110 }
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111
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112 int StreamingMemoryObject::readBytes(uint64_t address,
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113 uint64_t size,
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114 uint8_t* buf,
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115 uint64_t* copied) const {
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116 if (!fetchToPos(address + size - 1)) return -1;
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117 memcpy(buf, &Bytes[address + BytesSkipped], size);
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118 if (copied) *copied = size;
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119 return 0;
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120 }
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121
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122 bool StreamingMemoryObject::dropLeadingBytes(size_t s) {
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123 if (BytesRead < s) return true;
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124 BytesSkipped = s;
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125 BytesRead -= s;
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126 return false;
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127 }
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128
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129 void StreamingMemoryObject::setKnownObjectSize(size_t size) {
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130 ObjectSize = size;
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131 Bytes.reserve(size);
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132 }
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133
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134 StreamableMemoryObject *getNonStreamedMemoryObject(
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135 const unsigned char *Start, const unsigned char *End) {
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136 return new RawMemoryObject(Start, End);
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137 }
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138
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139 StreamableMemoryObject::~StreamableMemoryObject() { }
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140
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141 StreamingMemoryObject::StreamingMemoryObject(DataStreamer *streamer) :
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142 Bytes(kChunkSize), Streamer(streamer), BytesRead(0), BytesSkipped(0),
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143 ObjectSize(0), EOFReached(false) {
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144 BytesRead = streamer->GetBytes(&Bytes[0], kChunkSize);
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145 }
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146 }