1 //===-- IR/Statepoint.cpp -- gc.statepoint utilities ---  -----------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 //
9 // This file contains some utility functions to help recognize gc.statepoint
10 // intrinsics.
11 //
12 //===----------------------------------------------------------------------===//
13 
14 #include "llvm/IR/Statepoint.h"
15 
16 #include "llvm/IR/Function.h"
17 
18 using namespace llvm;
19 
20 bool llvm::isStatepoint(const CallBase *Call) {
21   if (auto *F = Call->getCalledFunction())
22     return F->getIntrinsicID() == Intrinsic::experimental_gc_statepoint;
23   return false;
24 }
25 
26 bool llvm::isStatepoint(const Value *V) {
27   if (auto *Call = dyn_cast<CallBase>(V))
28     return isStatepoint(Call);
29   return false;
30 }
31 
32 bool llvm::isStatepoint(const Value &V) {
33   return isStatepoint(&V);
34 }
35 
36 bool llvm::isGCRelocate(const CallBase *Call) {
37   return isa<GCRelocateInst>(Call);
38 }
39 
40 bool llvm::isGCRelocate(const Value *V) {
41   if (auto *Call = dyn_cast<CallBase>(V))
42     return isGCRelocate(Call);
43   return false;
44 }
45 
46 bool llvm::isGCResult(const CallBase *Call) { return isa<GCResultInst>(Call); }
47 
48 bool llvm::isGCResult(const Value *V) {
49   if (auto *Call = dyn_cast<CallBase>(V))
50     return isGCResult(Call);
51   return false;
52 }
53 
54 bool llvm::isStatepointDirectiveAttr(Attribute Attr) {
55   return Attr.hasAttribute("statepoint-id") ||
56          Attr.hasAttribute("statepoint-num-patch-bytes");
57 }
58 
59 StatepointDirectives
60 llvm::parseStatepointDirectivesFromAttrs(AttributeList AS) {
61   StatepointDirectives Result;
62 
63   Attribute AttrID =
64       AS.getAttribute(AttributeList::FunctionIndex, "statepoint-id");
65   uint64_t StatepointID;
66   if (AttrID.isStringAttribute())
67     if (!AttrID.getValueAsString().getAsInteger(10, StatepointID))
68       Result.StatepointID = StatepointID;
69 
70   uint32_t NumPatchBytes;
71   Attribute AttrNumPatchBytes = AS.getAttribute(AttributeList::FunctionIndex,
72                                                 "statepoint-num-patch-bytes");
73   if (AttrNumPatchBytes.isStringAttribute())
74     if (!AttrNumPatchBytes.getValueAsString().getAsInteger(10, NumPatchBytes))
75       Result.NumPatchBytes = NumPatchBytes;
76 
77   return Result;
78 }
79