• Home
  • Line#
  • Scopes#
  • Navigate#
  • Raw
  • Download
1 //===-- InstrinsicInst.cpp - Intrinsic Instruction Wrappers -----*- C++ -*-===//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
10 // This file implements methods that make it really easy to deal with intrinsic
11 // functions.
12 //
13 // All intrinsic function calls are instances of the call instruction, so these
14 // are all subclasses of the CallInst class.  Note that none of these classes
15 // has state or virtual methods, which is an important part of this gross/neat
16 // hack working.
17 //
18 // In some cases, arguments to intrinsics need to be generic and are defined as
19 // type pointer to empty struct { }*.  To access the real item of interest the
20 // cast instruction needs to be stripped away.
21 //
22 //===----------------------------------------------------------------------===//
23 
24 #include "llvm/IntrinsicInst.h"
25 #include "llvm/Constants.h"
26 #include "llvm/GlobalVariable.h"
27 #include "llvm/Metadata.h"
28 using namespace llvm;
29 
30 //===----------------------------------------------------------------------===//
31 /// DbgInfoIntrinsic - This is the common base class for debug info intrinsics
32 ///
33 
CastOperand(Value * C)34 static Value *CastOperand(Value *C) {
35   if (ConstantExpr *CE = dyn_cast<ConstantExpr>(C))
36     if (CE->isCast())
37       return CE->getOperand(0);
38   return NULL;
39 }
40 
StripCast(Value * C)41 Value *DbgInfoIntrinsic::StripCast(Value *C) {
42   if (Value *CO = CastOperand(C)) {
43     C = StripCast(CO);
44   } else if (GlobalVariable *GV = dyn_cast<GlobalVariable>(C)) {
45     if (GV->hasInitializer())
46       if (Value *CO = CastOperand(GV->getInitializer()))
47         C = StripCast(CO);
48   }
49   return dyn_cast<GlobalVariable>(C);
50 }
51 
52 //===----------------------------------------------------------------------===//
53 /// DbgDeclareInst - This represents the llvm.dbg.declare instruction.
54 ///
55 
getAddress() const56 Value *DbgDeclareInst::getAddress() const {
57   if (MDNode* MD = cast_or_null<MDNode>(getArgOperand(0)))
58     return MD->getOperand(0);
59   else
60     return NULL;
61 }
62 
63 //===----------------------------------------------------------------------===//
64 /// DbgValueInst - This represents the llvm.dbg.value instruction.
65 ///
66 
getValue() const67 const Value *DbgValueInst::getValue() const {
68   return cast<MDNode>(getArgOperand(0))->getOperand(0);
69 }
70 
getValue()71 Value *DbgValueInst::getValue() {
72   return cast<MDNode>(getArgOperand(0))->getOperand(0);
73 }
74