1 //===- TypeMetadataUtils.h - Utilities related to type metadata --*- 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 contains functions that make it easier to manipulate type metadata
11 // for devirtualization.
12 //
13 //===----------------------------------------------------------------------===//
14 
15 #ifndef LLVM_ANALYSIS_TYPEMETADATAUTILS_H
16 #define LLVM_ANALYSIS_TYPEMETADATAUTILS_H
17 
18 #include "llvm/ADT/SmallVector.h"
19 #include "llvm/IR/CallSite.h"
20 
21 namespace llvm {
22 
23 /// The type of CFI jumptable needed for a function.
24 enum CfiFunctionLinkage {
25   CFL_Definition = 0,
26   CFL_Declaration = 1,
27   CFL_WeakDeclaration = 2
28 };
29 
30 /// A call site that could be devirtualized.
31 struct DevirtCallSite {
32   /// The offset from the address point to the virtual function.
33   uint64_t Offset;
34   /// The call site itself.
35   CallSite CS;
36 };
37 
38 /// Given a call to the intrinsic \@llvm.type.test, find all devirtualizable
39 /// call sites based on the call and return them in DevirtCalls.
40 void findDevirtualizableCallsForTypeTest(
41     SmallVectorImpl<DevirtCallSite> &DevirtCalls,
42     SmallVectorImpl<CallInst *> &Assumes, const CallInst *CI);
43 
44 /// Given a call to the intrinsic \@llvm.type.checked.load, find all
45 /// devirtualizable call sites based on the call and return them in DevirtCalls.
46 void findDevirtualizableCallsForTypeCheckedLoad(
47     SmallVectorImpl<DevirtCallSite> &DevirtCalls,
48     SmallVectorImpl<Instruction *> &LoadedPtrs,
49     SmallVectorImpl<Instruction *> &Preds, bool &HasNonCallUses,
50     const CallInst *CI);
51 }
52 
53 #endif
54