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annotate anagram/support/agstack.cpp @ 21:1c9dac05d040

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Add lint-style FALLTHROUGH annotations to fallthrough cases. (in the parse engine and thus the output code) Document this, because the old output causes warnings with gcc10.
author David A. Holland
date Mon, 13 Jun 2022 00:04:38 -0400
parents 13d2b8934445
children
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1 /**********************************************************
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2
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3 The AnaGram Class Library
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4
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5 The AgStackStorage Class
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6 Copyright 1997 Parsifal Software. All Rights Reserved.
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7 See the file COPYING for license and usage terms.
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8
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9 ***********************************************************/
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10
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11 #include "agstack.h"
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12 #include "assert.h"
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13
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14 // Caution - enabling this causes AG to core before anything is logged
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15 //#define INCLUDE_LOGGING
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16 #include "log.h"
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17
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18
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19 static int bytesAllocated = 0;
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20 //int constructorCalls = 0;
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21 //int copyConstructorCalls = 0;
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22 //int destructorCalls = 0;
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23
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24 AgStackStorage::AgStackStorage(const unsigned quantum_,
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25 const unsigned logSize_,
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26 const unsigned bsLogSize_)
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27 : buffer(malloc((unsigned)(quantum_ * (1<< logSize_))))
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28 , bufferStack(0)
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29 , count(0)
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30 , usage(1)
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31 , quantum((unsigned short) quantum_)
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32 , bufferSize((unsigned short) (1 << logSize_))
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33 , mask((unsigned short) (bufferSize - 1))
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34 , index(0)
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35 , logSize((unsigned char) logSize_)
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36 , bsLogSize((unsigned char) bsLogSize_)
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37 {
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38 LOGSECTION("AgStackStorage::AgStackStorage");
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39 bytesAllocated += quantum * bufferSize;
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40 //LOGV(bytesAllocated) LCV(quantum * bufferSize);
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41 }
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42
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43 void *AgStackStorage::push() {
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44 if (index >= bufferSize) {
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45 if (bufferStack == 0) {
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46 bufferStack = new AgStack<void *>(bsLogSize);
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47 }
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48 bufferStack->push(buffer);
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49 //buffer = ::operator new(quantum*bufferSize);
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50 buffer = malloc(quantum*bufferSize);
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51 LOGS("AgStackStorage::push");
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52 bytesAllocated += quantum*bufferSize;
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53 //LOGV(bytesAllocated) LCV(quantum*bufferSize);
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54 index = 0;
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55 }
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56 count++;
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57 return (char *)buffer+quantum*index++;
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58 }
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59
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60 void *AgStackStorage::pop() {
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61 assert(count > 0);
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62 if (index == 0) {
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63 //delete buffer;
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64 free(buffer);
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65 LOGS("AgStackStorage::pop");
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66 bytesAllocated -= quantum*bufferSize;
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67 //LOGV(bytesAllocated) LCV(quantum * bufferSize);
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68 buffer = bufferStack->pop();
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69 if (bufferStack->size() == 0) {
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70 delete bufferStack;
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71 bufferStack = 0;
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72 }
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73 index = bufferSize;
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74 }
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75 count--;
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76 return (char *)buffer+quantum*(--index);
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77 }
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78
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79 AgStackStorage &AgStackStorage::discardData(unsigned n) {
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80 assert(count >= n);
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81 unsigned k = (unsigned) index < n ? index : n;
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82
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83 LOGSECTION("AgStackStorage::discardData");
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84 LOGV(n) LCV(count) LCV(index) LCV(k) LCV((int) buffer) LCV(logSize);
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85
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86 count -= k;
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87 index -= (unsigned short) k;
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88 if (count == 0) {
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89 return *this;
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90 }
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91 n -= k;
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92 if (index == 0 && bufferStack != 0) {
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93 //delete buffer;
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94 free(buffer);
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95 k = (n-1) >> logSize;
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96 LOGV(k);
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97 //if (k > 1) {
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98 //k--;
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99 if (k) {
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100 bufferStack->discardData(k);
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101 k <<= logSize;
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102 n -= k;
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103 count -= k;
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104 }
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105 LOGV(k) LCV(n) LCV(count);
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106 buffer = bufferStack->pop();
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107 if (bufferStack->size() == 0) {
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108 delete bufferStack;
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109 bufferStack = 0;
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110 }
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111 index = bufferSize;
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112 }
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113 count -= n;
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114 index -= (unsigned short) n;
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115 LOGV(n);
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116 LOGV(count);
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117 LOGV(index);
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118 LOGV(k);
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119 return *this;
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120 }
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121
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122 void *AgStackStorage::locate(const unsigned n) const {
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123 #ifdef INCLUDE_LOGGING
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124 if (n >= count) {
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125 LOGSECTION("AgStackStorage::locate");
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126 LOGV(n);
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127 LOGV(count);
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128 }
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129 #endif
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130 assert(n < count);
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131 if (bufferStack == 0) {
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132 return (char *) buffer + quantum*n;
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133 }
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134 unsigned q = n >> logSize;
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135 //void *buf = (q >= bufferStack->size()) ? buffer : (*bufferStack)[q];
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136 //return (char *)buf + quantum * (n&mask);
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137 if (q < bufferStack->size()) {
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138 return (char *)(*bufferStack)[q] + quantum * (n&mask);
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139 }
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140 return (char *) buffer + quantum * (n&mask);
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141
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142 }
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143
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144 AgStackStorage::~AgStackStorage() {
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145 LOGSECTION("AgStackStorage::~AgStackStorage");
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146 //delete buffer;
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147 free(buffer);
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148 bytesAllocated -= quantum*bufferSize;
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149 //LOGV(bytesAllocated) LCV(quantum*bufferSize);
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150 if (bufferStack) {
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151 int n = bufferStack->size();
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152 LOGV(n);
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153 while (n--) {
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154 // XXX. I believe this should be free(), not delete.
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155 delete (char *)bufferStack->pop();
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156 }
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157 delete bufferStack;
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158 }
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159 }
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160
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161 AgStackStorage &AgStackStorage::discardData() {
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162 discardData(count);
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163 return *this;
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164 }