lib/IR/Statepoint.cpp

   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::isGCRelocate(const Value *V) {
  48   if (auto CS = ImmutableCallSite(V))
  49     return isGCRelocate(CS);
  50   return false;
  51 }
  52
  53 bool llvm::isGCResult(ImmutableCallSite CS) {
  54   return CS.getInstruction() && isa<GCResultInst>(CS.getInstruction());
  55 }
  56
  57 bool llvm::isGCResult(const Value *V) {
  58   if (auto CS = ImmutableCallSite(V))
  59     return isGCResult(CS);
  60   return false;
  61 }
  62
  63 bool llvm::isStatepointDirectiveAttr(Attribute Attr) {
  64   return Attr.hasAttribute("statepoint-id") ||
  65          Attr.hasAttribute("statepoint-num-patch-bytes");
  66 }
  67
  68 StatepointDirectives
  69 llvm::parseStatepointDirectivesFromAttrs(AttributeList AS) {
  70   StatepointDirectives Result;
  71
  72   Attribute AttrID =
  73       AS.getAttribute(AttributeList::FunctionIndex, "statepoint-id");
  74   uint64_t StatepointID;
  75   if (AttrID.isStringAttribute())
  76     if (!AttrID.getValueAsString().getAsInteger(10, StatepointID))
  77       Result.StatepointID = StatepointID;
  78
  79   uint32_t NumPatchBytes;
  80   Attribute AttrNumPatchBytes = AS.getAttribute(AttributeList::FunctionIndex,
  81                                                 "statepoint-num-patch-bytes");
  82   if (AttrNumPatchBytes.isStringAttribute())
  83     if (!AttrNumPatchBytes.getValueAsString().getAsInteger(10, NumPatchBytes))
  84       Result.NumPatchBytes = NumPatchBytes;
  85
  86   return Result;
  87 }