1 //===-- IR/Statepoint.cpp -- gc.statepoint utilities ---  -----------------===//
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 some utility functions to help recognize gc.statepoint
11 // intrinsics.
12 //
13 //===----------------------------------------------------------------------===//
14 
15 #include "llvm/IR/Statepoint.h"
16 
17 #include "llvm/IR/Function.h"
18 
19 using namespace llvm;
20 
21 static const Function *getCalledFunction(ImmutableCallSite CS) {
22   if (!CS.getInstruction())
23     return nullptr;
24   return CS.getCalledFunction();
25 }
26 
27 bool llvm::isStatepoint(ImmutableCallSite CS) {
28   if (auto *F = getCalledFunction(CS))
29     return F->getIntrinsicID() == Intrinsic::experimental_gc_statepoint;
30   return false;
31 }
32 
33 bool llvm::isStatepoint(const Value *V) {
34   if (auto CS = ImmutableCallSite(V))
35     return isStatepoint(CS);
36   return false;
37 }
38 
39 bool llvm::isStatepoint(const Value &V) {
40   return isStatepoint(&V);
41 }
42 
43 bool llvm::isGCRelocate(ImmutableCallSite CS) {
44   return CS.getInstruction() && isa<GCRelocateInst>(CS.getInstruction());
45 }
46 
47 bool llvm::isGCResult(ImmutableCallSite CS) {
48   return CS.getInstruction() && isa<GCResultInst>(CS.getInstruction());
49 }
50 
51 bool llvm::isStatepointDirectiveAttr(Attribute Attr) {
52   return Attr.hasAttribute("statepoint-id") ||
53          Attr.hasAttribute("statepoint-num-patch-bytes");
54 }
55 
56 StatepointDirectives
57 llvm::parseStatepointDirectivesFromAttrs(AttributeList AS) {
58   StatepointDirectives Result;
59 
60   Attribute AttrID =
61       AS.getAttribute(AttributeList::FunctionIndex, "statepoint-id");
62   uint64_t StatepointID;
63   if (AttrID.isStringAttribute())
64     if (!AttrID.getValueAsString().getAsInteger(10, StatepointID))
65       Result.StatepointID = StatepointID;
66 
67   uint32_t NumPatchBytes;
68   Attribute AttrNumPatchBytes = AS.getAttribute(AttributeList::FunctionIndex,
69                                                 "statepoint-num-patch-bytes");
70   if (AttrNumPatchBytes.isStringAttribute())
71     if (!AttrNumPatchBytes.getValueAsString().getAsInteger(10, NumPatchBytes))
72       Result.NumPatchBytes = NumPatchBytes;
73 
74   return Result;
75 }
76