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annotate lib/IR/IntrinsicInst.cpp @ 117:facf19d07cd9

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check EHStack on EmitCall (CbC goto)
author Shinji KONO <kono@ie.u-ryukyu.ac.jp>
date Wed, 24 Aug 2016 20:10:41 +0900
parents 60c9769439b8
children 1172e4bd9c6f
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1 //===-- InstrinsicInst.cpp - Intrinsic Instruction Wrappers ---------------===//
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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 methods that make it really easy to deal with intrinsic
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11 // functions.
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12 //
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13 // All intrinsic function calls are instances of the call instruction, so these
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14 // are all subclasses of the CallInst class. Note that none of these classes
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15 // has state or virtual methods, which is an important part of this gross/neat
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16 // hack working.
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17 //
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18 // In some cases, arguments to intrinsics need to be generic and are defined as
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19 // type pointer to empty struct { }*. To access the real item of interest the
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20 // cast instruction needs to be stripped away.
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21 //
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22 //===----------------------------------------------------------------------===//
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23
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24 #include "llvm/IR/IntrinsicInst.h"
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25 #include "llvm/IR/Constants.h"
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26 #include "llvm/IR/GlobalVariable.h"
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27 #include "llvm/IR/Metadata.h"
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28 using namespace llvm;
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29
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30 //===----------------------------------------------------------------------===//
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31 /// DbgInfoIntrinsic - This is the common base class for debug info intrinsics
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32 ///
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33
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34 static Value *CastOperand(Value *C) {
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35 if (ConstantExpr *CE = dyn_cast<ConstantExpr>(C))
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36 if (CE->isCast())
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37 return CE->getOperand(0);
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38 return nullptr;
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39 }
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40
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41 Value *DbgInfoIntrinsic::StripCast(Value *C) {
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42 if (Value *CO = CastOperand(C)) {
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43 C = StripCast(CO);
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44 } else if (GlobalVariable *GV = dyn_cast<GlobalVariable>(C)) {
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45 if (GV->hasInitializer())
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46 if (Value *CO = CastOperand(GV->getInitializer()))
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47 C = StripCast(CO);
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48 }
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49 return dyn_cast<GlobalVariable>(C);
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50 }
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51
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52 static Value *getValueImpl(Value *Op) {
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53 auto *MD = cast<MetadataAsValue>(Op)->getMetadata();
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54 if (auto *V = dyn_cast<ValueAsMetadata>(MD))
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55 return V->getValue();
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56
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57 // When the value goes to null, it gets replaced by an empty MDNode.
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58 assert(!cast<MDNode>(MD)->getNumOperands() && "Expected an empty MDNode");
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59 return nullptr;
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60 }
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61
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62 //===----------------------------------------------------------------------===//
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63 /// DbgDeclareInst - This represents the llvm.dbg.declare instruction.
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64 ///
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65
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66 Value *DbgDeclareInst::getAddress() const {
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67 if (!getArgOperand(0))
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68 return nullptr;
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69
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70 return getValueImpl(getArgOperand(0));
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71 }
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72
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73 //===----------------------------------------------------------------------===//
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74 /// DbgValueInst - This represents the llvm.dbg.value instruction.
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75 ///
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76
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77 const Value *DbgValueInst::getValue() const {
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78 return const_cast<DbgValueInst *>(this)->getValue();
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79 }
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80
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81 Value *DbgValueInst::getValue() { return getValueImpl(getArgOperand(0)); }