Mercurial > projects > ldc
annotate ir/irlandingpad.cpp @ 1558:3adcb70700cb
Added back option to disable metadata generation and users. Set USE_METADATA to OFF in ccmake.
author | Tomas Lindquist Olsen <tomas.l.olsen gmail com> |
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date | Fri, 31 Jul 2009 11:28:31 +0200 |
parents | d6e8d5db259f |
children | 8d086d552909 |
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1 #include "gen/llvm.h" |
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2 #include "gen/tollvm.h" |
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3 #include "gen/irstate.h" |
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4 #include "gen/runtime.h" |
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5 #include "gen/logger.h" |
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6 #include "gen/classes.h" |
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7 #include "gen/llvmhelpers.h" |
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8 #include "ir/irlandingpad.h" |
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9 |
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10 IRLandingPadInfo::IRLandingPadInfo(Catch* catchstmt, llvm::BasicBlock* end) |
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11 : finallyBody(NULL) |
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12 { |
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13 target = llvm::BasicBlock::Create("catch", gIR->topfunc(), end); |
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14 gIR->scope() = IRScope(target,end); |
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15 |
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16 // assign storage to catch var |
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17 if(catchstmt->var) { |
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18 // use the same storage for all exceptions that are not accessed in |
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19 // nested functions |
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20 #if DMDV2 |
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21 if(!catchstmt->var->nestedrefs.dim) { |
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22 #else |
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23 if(!catchstmt->var->nestedref) { |
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24 #endif |
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25 assert(!catchstmt->var->ir.irLocal); |
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26 catchstmt->var->ir.irLocal = new IrLocal(catchstmt->var); |
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27 LLValue* catch_var = gIR->func()->gen->landingPadInfo.getExceptionStorage(); |
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28 catchstmt->var->ir.irLocal->value = gIR->ir->CreateBitCast(catch_var, getPtrToType(DtoType(catchstmt->var->type))); |
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29 } |
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30 |
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31 // this will alloca if we haven't already and take care of nested refs |
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32 DtoDeclarationExp(catchstmt->var); |
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33 |
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34 // the exception will only be stored in catch_var. copy it over if necessary |
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35 if(catchstmt->var->ir.irLocal->value != gIR->func()->gen->landingPadInfo.getExceptionStorage()) { |
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36 LLValue* exc = gIR->ir->CreateBitCast(DtoLoad(gIR->func()->gen->landingPadInfo.getExceptionStorage()), DtoType(catchstmt->var->type)); |
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37 DtoStore(exc, catchstmt->var->ir.irLocal->value); |
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38 } |
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39 } |
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40 |
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41 // emit handler, if there is one |
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42 // handler is zero for instance for 'catch { debug foo(); }' |
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43 if(catchstmt->handler) |
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44 catchstmt->handler->toIR(gIR); |
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45 |
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46 if (!gIR->scopereturned()) |
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47 gIR->ir->CreateBr(end); |
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48 |
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49 assert(catchstmt->type); |
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50 catchType = catchstmt->type->toBasetype()->isClassHandle(); |
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51 assert(catchType); |
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52 catchType->codegen(Type::sir); |
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53 } |
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54 |
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55 IRLandingPadInfo::IRLandingPadInfo(Statement* finallystmt) |
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56 : target(NULL), finallyBody(finallystmt), catchType(NULL) |
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57 { |
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58 |
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59 } |
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60 |
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61 |
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62 void IRLandingPad::addCatch(Catch* catchstmt, llvm::BasicBlock* end) |
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63 { |
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64 unpushed_infos.push_front(IRLandingPadInfo(catchstmt, end)); |
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65 } |
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66 |
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67 void IRLandingPad::addFinally(Statement* finallystmt) |
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68 { |
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69 unpushed_infos.push_front(IRLandingPadInfo(finallystmt)); |
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70 } |
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71 |
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72 void IRLandingPad::push(llvm::BasicBlock* inBB) |
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73 { |
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74 // store infos such that matches are right to left |
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75 nInfos.push(infos.size()); |
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76 infos.insert(infos.end(), unpushed_infos.begin(), unpushed_infos.end()); |
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77 unpushed_infos.clear(); |
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78 |
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79 constructLandingPad(inBB); |
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80 |
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81 // store as invoke target |
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82 padBBs.push(inBB); |
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83 } |
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84 |
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85 void IRLandingPad::pop() |
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86 { |
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87 padBBs.pop(); |
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88 |
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89 size_t n = nInfos.top(); |
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90 infos.resize(n); |
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91 nInfos.pop(); |
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92 } |
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93 |
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94 llvm::BasicBlock* IRLandingPad::get() |
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95 { |
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96 if(padBBs.size() == 0) |
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97 return NULL; |
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98 else |
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99 return padBBs.top(); |
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100 } |
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101 |
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102 void IRLandingPad::constructLandingPad(llvm::BasicBlock* inBB) |
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103 { |
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104 // save and rewrite scope |
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105 IRScope savedscope = gIR->scope(); |
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106 gIR->scope() = IRScope(inBB,savedscope.end); |
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107 |
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108 // eh_ptr = llvm.eh.exception(); |
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109 llvm::Function* eh_exception_fn = GET_INTRINSIC_DECL(eh_exception); |
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110 LLValue* eh_ptr = gIR->ir->CreateCall(eh_exception_fn); |
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111 |
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112 // build selector arguments |
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113 LLSmallVector<LLValue*, 6> selectorargs; |
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114 |
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115 // put in classinfos in the right order |
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116 bool hasFinally = false; |
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117 std::deque<IRLandingPadInfo>::iterator it = infos.begin(), end = infos.end(); |
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118 for(; it != end; ++it) |
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119 { |
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120 if(it->finallyBody) |
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121 hasFinally = true; |
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122 else |
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123 { |
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124 if(catchToInt.find(it->catchType) == catchToInt.end()) |
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125 { |
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126 int newval = 1 + catchToInt.size(); |
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127 catchToInt[it->catchType] = newval; |
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128 } |
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129 assert(it->catchType); |
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130 assert(it->catchType->ir.irStruct); |
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131 selectorargs.insert(selectorargs.begin(), it->catchType->ir.irStruct->getClassInfoSymbol()); |
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132 } |
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133 } |
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134 // if there's a finally, the eh table has to have a 0 action |
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135 if(hasFinally) |
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136 selectorargs.push_back(LLConstantInt::get(LLType::Int32Ty, 0)); |
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137 |
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138 // personality fn |
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139 llvm::Function* personality_fn = LLVM_D_GetRuntimeFunction(gIR->module, "_d_eh_personality"); |
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140 LLValue* personality_fn_arg = gIR->ir->CreateBitCast(personality_fn, getPtrToType(LLType::Int8Ty)); |
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141 selectorargs.insert(selectorargs.begin(), personality_fn_arg); |
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142 |
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143 // eh storage target |
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144 selectorargs.insert(selectorargs.begin(), eh_ptr); |
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145 |
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146 // if there is a catch and some catch allocated storage, store exception object |
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147 if(catchToInt.size() && catch_var) |
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148 { |
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149 const LLType* objectTy = DtoType(ClassDeclaration::object->type); |
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150 gIR->ir->CreateStore(gIR->ir->CreateBitCast(eh_ptr, objectTy), catch_var); |
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151 } |
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152 |
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153 // eh_sel = llvm.eh.selector(eh_ptr, cast(byte*)&_d_eh_personality, <selectorargs>); |
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154 llvm::Function* eh_selector_fn; |
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155 if (global.params.is64bit) |
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156 eh_selector_fn = GET_INTRINSIC_DECL(eh_selector_i64); |
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157 else |
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158 eh_selector_fn = GET_INTRINSIC_DECL(eh_selector_i32); |
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159 LLValue* eh_sel = gIR->ir->CreateCall(eh_selector_fn, selectorargs.begin(), selectorargs.end()); |
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160 |
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161 // emit finallys and switches that branch to catches until there are no more catches |
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162 // then simply branch to the finally chain |
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163 llvm::SwitchInst* switchinst = NULL; |
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164 std::deque<IRLandingPadInfo>::reverse_iterator rit, rend = infos.rend(); |
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165 for(rit = infos.rbegin(); rit != rend; ++rit) |
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166 { |
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167 // if it's a finally, emit its code |
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168 if(rit->finallyBody) |
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169 { |
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170 if(switchinst) |
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171 switchinst = NULL; |
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172 |
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173 // since this may be emitted multiple times |
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174 // give the labels a new scope |
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175 gIR->func()->gen->pushUniqueLabelScope("finally"); |
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176 rit->finallyBody->toIR(gIR); |
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177 gIR->func()->gen->popLabelScope(); |
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178 } |
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179 // otherwise it's a catch and we'll add a switch case |
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180 else |
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181 { |
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182 if(!switchinst) |
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183 { |
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184 switchinst = gIR->ir->CreateSwitch(eh_sel, llvm::BasicBlock::Create("switchdefault", gIR->topfunc(), gIR->scopeend()), infos.size()); |
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185 gIR->scope() = IRScope(switchinst->getDefaultDest(), gIR->scopeend()); |
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186 } |
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187 // dubious comment |
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188 // catches matched first get the largest switchval, so do size - unique int |
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189 llvm::ConstantInt* switchval = LLConstantInt::get(DtoSize_t(), catchToInt[rit->catchType]); |
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190 // and make sure we don't add the same switchval twice, may happen with nested trys |
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191 if(!switchinst->findCaseValue(switchval)) |
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192 switchinst->addCase(switchval, rit->target); |
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193 } |
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194 } |
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195 |
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196 // no catch matched and all finallys executed - resume unwind |
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197 llvm::Function* unwind_resume_fn = LLVM_D_GetRuntimeFunction(gIR->module, "_d_eh_resume_unwind"); |
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198 gIR->ir->CreateCall(unwind_resume_fn, eh_ptr); |
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199 gIR->ir->CreateUnreachable(); |
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200 |
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201 gIR->scope() = savedscope; |
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202 } |
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203 |
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204 LLValue* IRLandingPad::getExceptionStorage() |
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205 { |
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206 if(!catch_var) |
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207 { |
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208 Logger::println("Making new catch var"); |
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209 catch_var = DtoAlloca(ClassDeclaration::object->type, "catchvar"); |
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210 } |
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211 return catch_var; |
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212 } |