InlineFunction.cpp revision 824b958e6fb1236e92e4d07f3acf18fca107cdc0
1ca398dc3989d35e8516489fd163e012133bd41cbChris Lattner//===- InlineFunction.cpp - Code to perform function inlining -------------===// 2fd93908ae8b9684fe71c239e3c6cfe13ff6a2663Misha Brukman// 3b576c94c15af9a440f69d9d03c2afead7971118cJohn Criswell// The LLVM Compiler Infrastructure 4b576c94c15af9a440f69d9d03c2afead7971118cJohn Criswell// 54ee451de366474b9c228b4e5fa573795a715216dChris Lattner// This file is distributed under the University of Illinois Open Source 64ee451de366474b9c228b4e5fa573795a715216dChris Lattner// License. See LICENSE.TXT for details. 7fd93908ae8b9684fe71c239e3c6cfe13ff6a2663Misha Brukman// 8b576c94c15af9a440f69d9d03c2afead7971118cJohn Criswell//===----------------------------------------------------------------------===// 9ca398dc3989d35e8516489fd163e012133bd41cbChris Lattner// 10ca398dc3989d35e8516489fd163e012133bd41cbChris Lattner// This file implements inlining of a function into a call site, resolving 11ca398dc3989d35e8516489fd163e012133bd41cbChris Lattner// parameters and the return value as appropriate. 12ca398dc3989d35e8516489fd163e012133bd41cbChris Lattner// 13ca398dc3989d35e8516489fd163e012133bd41cbChris Lattner//===----------------------------------------------------------------------===// 14ca398dc3989d35e8516489fd163e012133bd41cbChris Lattner 15ca398dc3989d35e8516489fd163e012133bd41cbChris Lattner#include "llvm/Transforms/Utils/Cloning.h" 163787e765facfad5ea62753922d940bcdd52afd57Chris Lattner#include "llvm/Constants.h" 177152c237b46a920b29d5605af934766b8f9a07a1Chris Lattner#include "llvm/DerivedTypes.h" 18ca398dc3989d35e8516489fd163e012133bd41cbChris Lattner#include "llvm/Module.h" 1980a38d245359cb0a3be8f78f5d7d911232886b9aChris Lattner#include "llvm/Instructions.h" 2080a38d245359cb0a3be8f78f5d7d911232886b9aChris Lattner#include "llvm/Intrinsics.h" 21eaf42abab6d465c38891345d999255871cf03943Devang Patel#include "llvm/Attributes.h" 22468fb1df7db466e5682ee44341c3990b599e8d6aChris Lattner#include "llvm/Analysis/CallGraph.h" 23c93adca35856d0eaae088e52ba30cfefbd7ad910Chris Lattner#include "llvm/Target/TargetData.h" 2493e985f1b17aef62d58e3198a4604f9f6cfe8d19Chris Lattner#include "llvm/ADT/SmallVector.h" 25641ca93cff0f957fc5fb9dfb05d2a4a340aa8af7Devang Patel#include "llvm/ADT/StringExtras.h" 2680a38d245359cb0a3be8f78f5d7d911232886b9aChris Lattner#include "llvm/Support/CallSite.h" 27f7703df4968084c18c248c1feea9961c19a32e6aChris Lattnerusing namespace llvm; 28ca398dc3989d35e8516489fd163e012133bd41cbChris Lattner 291dfdf8255e803d6376f5fe94a113f892e796ae6cChris Lattnerbool llvm::InlineFunction(CallInst *CI, CallGraph *CG, const TargetData *TD) { 301dfdf8255e803d6376f5fe94a113f892e796ae6cChris Lattner return InlineFunction(CallSite(CI), CG, TD); 31468fb1df7db466e5682ee44341c3990b599e8d6aChris Lattner} 321dfdf8255e803d6376f5fe94a113f892e796ae6cChris Lattnerbool llvm::InlineFunction(InvokeInst *II, CallGraph *CG, const TargetData *TD) { 331dfdf8255e803d6376f5fe94a113f892e796ae6cChris Lattner return InlineFunction(CallSite(II), CG, TD); 34468fb1df7db466e5682ee44341c3990b599e8d6aChris Lattner} 3580a38d245359cb0a3be8f78f5d7d911232886b9aChris Lattner 36cd4d339ec187182c9abc22b80560349f8ba5010fChris Lattner/// HandleInlinedInvoke - If we inlined an invoke site, we need to convert calls 37cd4d339ec187182c9abc22b80560349f8ba5010fChris Lattner/// in the body of the inlined function into invokes and turn unwind 38cd4d339ec187182c9abc22b80560349f8ba5010fChris Lattner/// instructions into branches to the invoke unwind dest. 39cd4d339ec187182c9abc22b80560349f8ba5010fChris Lattner/// 40cd4d339ec187182c9abc22b80560349f8ba5010fChris Lattner/// II is the invoke instruction begin inlined. FirstNewBlock is the first 41cd4d339ec187182c9abc22b80560349f8ba5010fChris Lattner/// block of the inlined code (the last block is the end of the function), 42cd4d339ec187182c9abc22b80560349f8ba5010fChris Lattner/// and InlineCodeInfo is information about the code that got inlined. 43cd4d339ec187182c9abc22b80560349f8ba5010fChris Lattnerstatic void HandleInlinedInvoke(InvokeInst *II, BasicBlock *FirstNewBlock, 44cd4d339ec187182c9abc22b80560349f8ba5010fChris Lattner ClonedCodeInfo &InlinedCodeInfo) { 45cd4d339ec187182c9abc22b80560349f8ba5010fChris Lattner BasicBlock *InvokeDest = II->getUnwindDest(); 46cd4d339ec187182c9abc22b80560349f8ba5010fChris Lattner std::vector<Value*> InvokeDestPHIValues; 47cd4d339ec187182c9abc22b80560349f8ba5010fChris Lattner 48cd4d339ec187182c9abc22b80560349f8ba5010fChris Lattner // If there are PHI nodes in the unwind destination block, we need to 49cd4d339ec187182c9abc22b80560349f8ba5010fChris Lattner // keep track of which values came into them from this invoke, then remove 50cd4d339ec187182c9abc22b80560349f8ba5010fChris Lattner // the entry for this block. 51cd4d339ec187182c9abc22b80560349f8ba5010fChris Lattner BasicBlock *InvokeBlock = II->getParent(); 52cd4d339ec187182c9abc22b80560349f8ba5010fChris Lattner for (BasicBlock::iterator I = InvokeDest->begin(); isa<PHINode>(I); ++I) { 53cd4d339ec187182c9abc22b80560349f8ba5010fChris Lattner PHINode *PN = cast<PHINode>(I); 54cd4d339ec187182c9abc22b80560349f8ba5010fChris Lattner // Save the value to use for this edge. 55cd4d339ec187182c9abc22b80560349f8ba5010fChris Lattner InvokeDestPHIValues.push_back(PN->getIncomingValueForBlock(InvokeBlock)); 56cd4d339ec187182c9abc22b80560349f8ba5010fChris Lattner } 57cd4d339ec187182c9abc22b80560349f8ba5010fChris Lattner 58cd4d339ec187182c9abc22b80560349f8ba5010fChris Lattner Function *Caller = FirstNewBlock->getParent(); 59a7212e58260f6d1ead0c4eec7af400cf6c0d289eDuncan Sands 60cd4d339ec187182c9abc22b80560349f8ba5010fChris Lattner // The inlined code is currently at the end of the function, scan from the 61cd4d339ec187182c9abc22b80560349f8ba5010fChris Lattner // start of the inlined code to its end, checking for stuff we need to 62cd4d339ec187182c9abc22b80560349f8ba5010fChris Lattner // rewrite. 63727d1dd58793447e83ade712f0e58172f156edcfChris Lattner if (InlinedCodeInfo.ContainsCalls || InlinedCodeInfo.ContainsUnwinds) { 64727d1dd58793447e83ade712f0e58172f156edcfChris Lattner for (Function::iterator BB = FirstNewBlock, E = Caller->end(); 65727d1dd58793447e83ade712f0e58172f156edcfChris Lattner BB != E; ++BB) { 66727d1dd58793447e83ade712f0e58172f156edcfChris Lattner if (InlinedCodeInfo.ContainsCalls) { 67727d1dd58793447e83ade712f0e58172f156edcfChris Lattner for (BasicBlock::iterator BBI = BB->begin(), E = BB->end(); BBI != E; ){ 68727d1dd58793447e83ade712f0e58172f156edcfChris Lattner Instruction *I = BBI++; 69a7212e58260f6d1ead0c4eec7af400cf6c0d289eDuncan Sands 70727d1dd58793447e83ade712f0e58172f156edcfChris Lattner // We only need to check for function calls: inlined invoke 71727d1dd58793447e83ade712f0e58172f156edcfChris Lattner // instructions require no special handling. 72727d1dd58793447e83ade712f0e58172f156edcfChris Lattner if (!isa<CallInst>(I)) continue; 73727d1dd58793447e83ade712f0e58172f156edcfChris Lattner CallInst *CI = cast<CallInst>(I); 74cd4d339ec187182c9abc22b80560349f8ba5010fChris Lattner 75fd7b326bea39c077eea8d378156bcf09051cc4ecDuncan Sands // If this call cannot unwind, don't convert it to an invoke. 762b0e8990ab33ec2dad21286d3ce01dbb4bbe63c1Duncan Sands if (CI->doesNotThrow()) 77727d1dd58793447e83ade712f0e58172f156edcfChris Lattner continue; 78a3355ffb3d30d19d226bbb75707991c60f236e37Duncan Sands 79727d1dd58793447e83ade712f0e58172f156edcfChris Lattner // Convert this function call into an invoke instruction. 80727d1dd58793447e83ade712f0e58172f156edcfChris Lattner // First, split the basic block. 81727d1dd58793447e83ade712f0e58172f156edcfChris Lattner BasicBlock *Split = BB->splitBasicBlock(CI, CI->getName()+".noexc"); 82a7212e58260f6d1ead0c4eec7af400cf6c0d289eDuncan Sands 83727d1dd58793447e83ade712f0e58172f156edcfChris Lattner // Next, create the new invoke instruction, inserting it at the end 84727d1dd58793447e83ade712f0e58172f156edcfChris Lattner // of the old basic block. 8593e985f1b17aef62d58e3198a4604f9f6cfe8d19Chris Lattner SmallVector<Value*, 8> InvokeArgs(CI->op_begin()+1, CI->op_end()); 86727d1dd58793447e83ade712f0e58172f156edcfChris Lattner InvokeInst *II = 87051a950000e21935165db56695e35bade668193bGabor Greif InvokeInst::Create(CI->getCalledValue(), Split, InvokeDest, 88051a950000e21935165db56695e35bade668193bGabor Greif InvokeArgs.begin(), InvokeArgs.end(), 89051a950000e21935165db56695e35bade668193bGabor Greif CI->getName(), BB->getTerminator()); 90727d1dd58793447e83ade712f0e58172f156edcfChris Lattner II->setCallingConv(CI->getCallingConv()); 910598866c052147c31b808391f58434ce3dbfb838Devang Patel II->setAttributes(CI->getAttributes()); 92a7212e58260f6d1ead0c4eec7af400cf6c0d289eDuncan Sands 93727d1dd58793447e83ade712f0e58172f156edcfChris Lattner // Make sure that anything using the call now uses the invoke! 94727d1dd58793447e83ade712f0e58172f156edcfChris Lattner CI->replaceAllUsesWith(II); 95a7212e58260f6d1ead0c4eec7af400cf6c0d289eDuncan Sands 96727d1dd58793447e83ade712f0e58172f156edcfChris Lattner // Delete the unconditional branch inserted by splitBasicBlock 97727d1dd58793447e83ade712f0e58172f156edcfChris Lattner BB->getInstList().pop_back(); 98727d1dd58793447e83ade712f0e58172f156edcfChris Lattner Split->getInstList().pop_front(); // Delete the original call 99a7212e58260f6d1ead0c4eec7af400cf6c0d289eDuncan Sands 100727d1dd58793447e83ade712f0e58172f156edcfChris Lattner // Update any PHI nodes in the exceptional block to indicate that 101727d1dd58793447e83ade712f0e58172f156edcfChris Lattner // there is now a new entry in them. 102727d1dd58793447e83ade712f0e58172f156edcfChris Lattner unsigned i = 0; 103727d1dd58793447e83ade712f0e58172f156edcfChris Lattner for (BasicBlock::iterator I = InvokeDest->begin(); 104727d1dd58793447e83ade712f0e58172f156edcfChris Lattner isa<PHINode>(I); ++I, ++i) { 105727d1dd58793447e83ade712f0e58172f156edcfChris Lattner PHINode *PN = cast<PHINode>(I); 106727d1dd58793447e83ade712f0e58172f156edcfChris Lattner PN->addIncoming(InvokeDestPHIValues[i], BB); 107727d1dd58793447e83ade712f0e58172f156edcfChris Lattner } 108a7212e58260f6d1ead0c4eec7af400cf6c0d289eDuncan Sands 109727d1dd58793447e83ade712f0e58172f156edcfChris Lattner // This basic block is now complete, start scanning the next one. 110727d1dd58793447e83ade712f0e58172f156edcfChris Lattner break; 111727d1dd58793447e83ade712f0e58172f156edcfChris Lattner } 112cd4d339ec187182c9abc22b80560349f8ba5010fChris Lattner } 113a7212e58260f6d1ead0c4eec7af400cf6c0d289eDuncan Sands 114727d1dd58793447e83ade712f0e58172f156edcfChris Lattner if (UnwindInst *UI = dyn_cast<UnwindInst>(BB->getTerminator())) { 115727d1dd58793447e83ade712f0e58172f156edcfChris Lattner // An UnwindInst requires special handling when it gets inlined into an 116727d1dd58793447e83ade712f0e58172f156edcfChris Lattner // invoke site. Once this happens, we know that the unwind would cause 117727d1dd58793447e83ade712f0e58172f156edcfChris Lattner // a control transfer to the invoke exception destination, so we can 118727d1dd58793447e83ade712f0e58172f156edcfChris Lattner // transform it into a direct branch to the exception destination. 119051a950000e21935165db56695e35bade668193bGabor Greif BranchInst::Create(InvokeDest, UI); 120a7212e58260f6d1ead0c4eec7af400cf6c0d289eDuncan Sands 121727d1dd58793447e83ade712f0e58172f156edcfChris Lattner // Delete the unwind instruction! 1221adec83ae84031bfa9f0bf209c5ee6c64906a1ffDan Gohman UI->eraseFromParent(); 123a7212e58260f6d1ead0c4eec7af400cf6c0d289eDuncan Sands 124727d1dd58793447e83ade712f0e58172f156edcfChris Lattner // Update any PHI nodes in the exceptional block to indicate that 125727d1dd58793447e83ade712f0e58172f156edcfChris Lattner // there is now a new entry in them. 126727d1dd58793447e83ade712f0e58172f156edcfChris Lattner unsigned i = 0; 127727d1dd58793447e83ade712f0e58172f156edcfChris Lattner for (BasicBlock::iterator I = InvokeDest->begin(); 128727d1dd58793447e83ade712f0e58172f156edcfChris Lattner isa<PHINode>(I); ++I, ++i) { 129727d1dd58793447e83ade712f0e58172f156edcfChris Lattner PHINode *PN = cast<PHINode>(I); 130727d1dd58793447e83ade712f0e58172f156edcfChris Lattner PN->addIncoming(InvokeDestPHIValues[i], BB); 131727d1dd58793447e83ade712f0e58172f156edcfChris Lattner } 132cd4d339ec187182c9abc22b80560349f8ba5010fChris Lattner } 133cd4d339ec187182c9abc22b80560349f8ba5010fChris Lattner } 134cd4d339ec187182c9abc22b80560349f8ba5010fChris Lattner } 135cd4d339ec187182c9abc22b80560349f8ba5010fChris Lattner 136cd4d339ec187182c9abc22b80560349f8ba5010fChris Lattner // Now that everything is happy, we have one final detail. The PHI nodes in 137cd4d339ec187182c9abc22b80560349f8ba5010fChris Lattner // the exception destination block still have entries due to the original 138cd4d339ec187182c9abc22b80560349f8ba5010fChris Lattner // invoke instruction. Eliminate these entries (which might even delete the 139cd4d339ec187182c9abc22b80560349f8ba5010fChris Lattner // PHI node) now. 140cd4d339ec187182c9abc22b80560349f8ba5010fChris Lattner InvokeDest->removePredecessor(II->getParent()); 141cd4d339ec187182c9abc22b80560349f8ba5010fChris Lattner} 142cd4d339ec187182c9abc22b80560349f8ba5010fChris Lattner 143d85340f4ec587e22b0239617f3b747a6df113894Chris Lattner/// UpdateCallGraphAfterInlining - Once we have cloned code over from a callee 144d85340f4ec587e22b0239617f3b747a6df113894Chris Lattner/// into the caller, update the specified callgraph to reflect the changes we 145d85340f4ec587e22b0239617f3b747a6df113894Chris Lattner/// made. Note that it's possible that not all code was copied over, so only 146d7b9851c4e634ed3599b1a4c70b1c76c90a11686Duncan Sands/// some edges of the callgraph may remain. 147d7b9851c4e634ed3599b1a4c70b1c76c90a11686Duncan Sandsstatic void UpdateCallGraphAfterInlining(CallSite CS, 148d85340f4ec587e22b0239617f3b747a6df113894Chris Lattner Function::iterator FirstNewBlock, 1495e665f559419c7f58a4fd9360cd488f065505c44Chris Lattner DenseMap<const Value*, Value*> &ValueMap, 150468fb1df7db466e5682ee44341c3990b599e8d6aChris Lattner CallGraph &CG) { 151d7b9851c4e634ed3599b1a4c70b1c76c90a11686Duncan Sands const Function *Caller = CS.getInstruction()->getParent()->getParent(); 152d7b9851c4e634ed3599b1a4c70b1c76c90a11686Duncan Sands const Function *Callee = CS.getCalledFunction(); 153d7b9851c4e634ed3599b1a4c70b1c76c90a11686Duncan Sands 154468fb1df7db466e5682ee44341c3990b599e8d6aChris Lattner // Update the call graph by deleting the edge from Callee to Caller 155468fb1df7db466e5682ee44341c3990b599e8d6aChris Lattner CallGraphNode *CalleeNode = CG[Callee]; 156468fb1df7db466e5682ee44341c3990b599e8d6aChris Lattner CallGraphNode *CallerNode = CG[Caller]; 157d7b9851c4e634ed3599b1a4c70b1c76c90a11686Duncan Sands CallerNode->removeCallEdgeFor(CS); 158a7212e58260f6d1ead0c4eec7af400cf6c0d289eDuncan Sands 159d85340f4ec587e22b0239617f3b747a6df113894Chris Lattner // Since we inlined some uninlined call sites in the callee into the caller, 160468fb1df7db466e5682ee44341c3990b599e8d6aChris Lattner // add edges from the caller to all of the callees of the callee. 161468fb1df7db466e5682ee44341c3990b599e8d6aChris Lattner for (CallGraphNode::iterator I = CalleeNode->begin(), 162d85340f4ec587e22b0239617f3b747a6df113894Chris Lattner E = CalleeNode->end(); I != E; ++I) { 163d85340f4ec587e22b0239617f3b747a6df113894Chris Lattner const Instruction *OrigCall = I->first.getInstruction(); 164a7212e58260f6d1ead0c4eec7af400cf6c0d289eDuncan Sands 1655e665f559419c7f58a4fd9360cd488f065505c44Chris Lattner DenseMap<const Value*, Value*>::iterator VMI = ValueMap.find(OrigCall); 166981418bf1562d0b5b470ddc7d0034c9f3297b893Chris Lattner // Only copy the edge if the call was inlined! 167981418bf1562d0b5b470ddc7d0034c9f3297b893Chris Lattner if (VMI != ValueMap.end() && VMI->second) { 1681bb3a402574557cb228f8a96030776c229e282e5Chris Lattner // If the call was inlined, but then constant folded, there is no edge to 1691bb3a402574557cb228f8a96030776c229e282e5Chris Lattner // add. Check for this case. 1701bb3a402574557cb228f8a96030776c229e282e5Chris Lattner if (Instruction *NewCall = dyn_cast<Instruction>(VMI->second)) 1711bb3a402574557cb228f8a96030776c229e282e5Chris Lattner CallerNode->addCalledFunction(CallSite::get(NewCall), I->second); 172d85340f4ec587e22b0239617f3b747a6df113894Chris Lattner } 173d85340f4ec587e22b0239617f3b747a6df113894Chris Lattner } 174468fb1df7db466e5682ee44341c3990b599e8d6aChris Lattner} 175468fb1df7db466e5682ee44341c3990b599e8d6aChris Lattner 176cd4d339ec187182c9abc22b80560349f8ba5010fChris Lattner 177ca398dc3989d35e8516489fd163e012133bd41cbChris Lattner// InlineFunction - This function inlines the called function into the basic 178ca398dc3989d35e8516489fd163e012133bd41cbChris Lattner// block of the caller. This returns false if it is not possible to inline this 179ca398dc3989d35e8516489fd163e012133bd41cbChris Lattner// call. The program is still in a well defined state if this occurs though. 180ca398dc3989d35e8516489fd163e012133bd41cbChris Lattner// 181fd93908ae8b9684fe71c239e3c6cfe13ff6a2663Misha Brukman// Note that this only does one level of inlining. For example, if the 182fd93908ae8b9684fe71c239e3c6cfe13ff6a2663Misha Brukman// instruction 'call B' is inlined, and 'B' calls 'C', then the call to 'C' now 183ca398dc3989d35e8516489fd163e012133bd41cbChris Lattner// exists in the instruction stream. Similiarly this will inline a recursive 184ca398dc3989d35e8516489fd163e012133bd41cbChris Lattner// function by one level. 185ca398dc3989d35e8516489fd163e012133bd41cbChris Lattner// 1861dfdf8255e803d6376f5fe94a113f892e796ae6cChris Lattnerbool llvm::InlineFunction(CallSite CS, CallGraph *CG, const TargetData *TD) { 18780a38d245359cb0a3be8f78f5d7d911232886b9aChris Lattner Instruction *TheCall = CS.getInstruction(); 18880a38d245359cb0a3be8f78f5d7d911232886b9aChris Lattner assert(TheCall->getParent() && TheCall->getParent()->getParent() && 18980a38d245359cb0a3be8f78f5d7d911232886b9aChris Lattner "Instruction not in function!"); 190ca398dc3989d35e8516489fd163e012133bd41cbChris Lattner 19180a38d245359cb0a3be8f78f5d7d911232886b9aChris Lattner const Function *CalledFunc = CS.getCalledFunction(); 192ca398dc3989d35e8516489fd163e012133bd41cbChris Lattner if (CalledFunc == 0 || // Can't inline external function or indirect 1935cbf985dcbc89fba3208e7baf8b6f488b06d3ec9Reid Spencer CalledFunc->isDeclaration() || // call, or call to a vararg function! 194ca398dc3989d35e8516489fd163e012133bd41cbChris Lattner CalledFunc->getFunctionType()->isVarArg()) return false; 195ca398dc3989d35e8516489fd163e012133bd41cbChris Lattner 1961b49141821e98e4321bfe6234c7001c836b2a289Chris Lattner 1971b49141821e98e4321bfe6234c7001c836b2a289Chris Lattner // If the call to the callee is a non-tail call, we must clear the 'tail' 1981b49141821e98e4321bfe6234c7001c836b2a289Chris Lattner // flags on any calls that we inline. 1991b49141821e98e4321bfe6234c7001c836b2a289Chris Lattner bool MustClearTailCallFlags = 2003799ed83b4cb80695a81294da6a7d18cf0884f5eChris Lattner isa<CallInst>(TheCall) && !cast<CallInst>(TheCall)->isTailCall(); 2011b49141821e98e4321bfe6234c7001c836b2a289Chris Lattner 202f0c3354d998507515ab39e26b5292ea0ceb06aefDuncan Sands // If the call to the callee cannot throw, set the 'nounwind' flag on any 203f0c3354d998507515ab39e26b5292ea0ceb06aefDuncan Sands // calls that we inline. 204f0c3354d998507515ab39e26b5292ea0ceb06aefDuncan Sands bool MarkNoUnwind = CS.doesNotThrow(); 205f0c3354d998507515ab39e26b5292ea0ceb06aefDuncan Sands 20680a38d245359cb0a3be8f78f5d7d911232886b9aChris Lattner BasicBlock *OrigBB = TheCall->getParent(); 207ca398dc3989d35e8516489fd163e012133bd41cbChris Lattner Function *Caller = OrigBB->getParent(); 208ca398dc3989d35e8516489fd163e012133bd41cbChris Lattner 2090e13821c96937830ec817f08095c3cef1fdcac8dGordon Henriksen // GC poses two hazards to inlining, which only occur when the callee has GC: 2100e13821c96937830ec817f08095c3cef1fdcac8dGordon Henriksen // 1. If the caller has no GC, then the callee's GC must be propagated to the 2110e13821c96937830ec817f08095c3cef1fdcac8dGordon Henriksen // caller. 2120e13821c96937830ec817f08095c3cef1fdcac8dGordon Henriksen // 2. If the caller has a differing GC, it is invalid to inline. 2135eca075b74d62c621b160aa216b4cd50829a2cc7Gordon Henriksen if (CalledFunc->hasGC()) { 2145eca075b74d62c621b160aa216b4cd50829a2cc7Gordon Henriksen if (!Caller->hasGC()) 2155eca075b74d62c621b160aa216b4cd50829a2cc7Gordon Henriksen Caller->setGC(CalledFunc->getGC()); 2165eca075b74d62c621b160aa216b4cd50829a2cc7Gordon Henriksen else if (CalledFunc->getGC() != Caller->getGC()) 2170e13821c96937830ec817f08095c3cef1fdcac8dGordon Henriksen return false; 2180e13821c96937830ec817f08095c3cef1fdcac8dGordon Henriksen } 219a7212e58260f6d1ead0c4eec7af400cf6c0d289eDuncan Sands 2205052c911ec1be51ecb36e7f025c26412e9f1bfacChris Lattner // Get an iterator to the last basic block in the function, which will have 2215052c911ec1be51ecb36e7f025c26412e9f1bfacChris Lattner // the new function inlined after it. 2225052c911ec1be51ecb36e7f025c26412e9f1bfacChris Lattner // 2235052c911ec1be51ecb36e7f025c26412e9f1bfacChris Lattner Function::iterator LastBlock = &Caller->back(); 2245052c911ec1be51ecb36e7f025c26412e9f1bfacChris Lattner 2255e923dee6024248f58fa83a7c7299437f44f0d1aChris Lattner // Make sure to capture all of the return instructions from the cloned 2265e923dee6024248f58fa83a7c7299437f44f0d1aChris Lattner // function. 2275052c911ec1be51ecb36e7f025c26412e9f1bfacChris Lattner std::vector<ReturnInst*> Returns; 228cd4d339ec187182c9abc22b80560349f8ba5010fChris Lattner ClonedCodeInfo InlinedFunctionInfo; 229d85340f4ec587e22b0239617f3b747a6df113894Chris Lattner Function::iterator FirstNewBlock; 230f0c3354d998507515ab39e26b5292ea0ceb06aefDuncan Sands 2315e923dee6024248f58fa83a7c7299437f44f0d1aChris Lattner { // Scope to destroy ValueMap after cloning. 2325e665f559419c7f58a4fd9360cd488f065505c44Chris Lattner DenseMap<const Value*, Value*> ValueMap; 2335b5bc3032f97cfa7bfa3e22282d3a9c1ed05eec6Chris Lattner 2349614fcc640eb628cc5dfddb277ebae9f6cb61014Dan Gohman assert(CalledFunc->arg_size() == CS.arg_size() && 2355e923dee6024248f58fa83a7c7299437f44f0d1aChris Lattner "No varargs calls can be inlined!"); 236a7212e58260f6d1ead0c4eec7af400cf6c0d289eDuncan Sands 237c93adca35856d0eaae088e52ba30cfefbd7ad910Chris Lattner // Calculate the vector of arguments to pass into the function cloner, which 238c93adca35856d0eaae088e52ba30cfefbd7ad910Chris Lattner // matches up the formal to the actual argument values. 2395e923dee6024248f58fa83a7c7299437f44f0d1aChris Lattner CallSite::arg_iterator AI = CS.arg_begin(); 240c93adca35856d0eaae088e52ba30cfefbd7ad910Chris Lattner unsigned ArgNo = 0; 241e4d5c441e04bdc00ccf1804744af670655123b07Chris Lattner for (Function::const_arg_iterator I = CalledFunc->arg_begin(), 242c93adca35856d0eaae088e52ba30cfefbd7ad910Chris Lattner E = CalledFunc->arg_end(); I != E; ++I, ++AI, ++ArgNo) { 243c93adca35856d0eaae088e52ba30cfefbd7ad910Chris Lattner Value *ActualArg = *AI; 244a7212e58260f6d1ead0c4eec7af400cf6c0d289eDuncan Sands 245d82375c1c43db7f823dd4660d3495e76566699e3Duncan Sands // When byval arguments actually inlined, we need to make the copy implied 246d82375c1c43db7f823dd4660d3495e76566699e3Duncan Sands // by them explicit. However, we don't do this if the callee is readonly 247d82375c1c43db7f823dd4660d3495e76566699e3Duncan Sands // or readnone, because the copy would be unneeded: the callee doesn't 248d82375c1c43db7f823dd4660d3495e76566699e3Duncan Sands // modify the struct. 2490598866c052147c31b808391f58434ce3dbfb838Devang Patel if (CalledFunc->paramHasAttr(ArgNo+1, Attribute::ByVal) && 250d82375c1c43db7f823dd4660d3495e76566699e3Duncan Sands !CalledFunc->onlyReadsMemory()) { 251c93adca35856d0eaae088e52ba30cfefbd7ad910Chris Lattner const Type *AggTy = cast<PointerType>(I->getType())->getElementType(); 252c93adca35856d0eaae088e52ba30cfefbd7ad910Chris Lattner const Type *VoidPtrTy = PointerType::getUnqual(Type::Int8Ty); 253a7212e58260f6d1ead0c4eec7af400cf6c0d289eDuncan Sands 254c93adca35856d0eaae088e52ba30cfefbd7ad910Chris Lattner // Create the alloca. If we have TargetData, use nice alignment. 255c93adca35856d0eaae088e52ba30cfefbd7ad910Chris Lattner unsigned Align = 1; 256c93adca35856d0eaae088e52ba30cfefbd7ad910Chris Lattner if (TD) Align = TD->getPrefTypeAlignment(AggTy); 257a7212e58260f6d1ead0c4eec7af400cf6c0d289eDuncan Sands Value *NewAlloca = new AllocaInst(AggTy, 0, Align, I->getName(), 258c93adca35856d0eaae088e52ba30cfefbd7ad910Chris Lattner Caller->begin()->begin()); 259c93adca35856d0eaae088e52ba30cfefbd7ad910Chris Lattner // Emit a memcpy. 260824b958e6fb1236e92e4d07f3acf18fca107cdc0Chris Lattner const Type *Tys[] = { Type::Int64Ty }; 261c93adca35856d0eaae088e52ba30cfefbd7ad910Chris Lattner Function *MemCpyFn = Intrinsic::getDeclaration(Caller->getParent(), 262824b958e6fb1236e92e4d07f3acf18fca107cdc0Chris Lattner Intrinsic::memcpy, 263824b958e6fb1236e92e4d07f3acf18fca107cdc0Chris Lattner Tys, 1); 264c93adca35856d0eaae088e52ba30cfefbd7ad910Chris Lattner Value *DestCast = new BitCastInst(NewAlloca, VoidPtrTy, "tmp", TheCall); 265c93adca35856d0eaae088e52ba30cfefbd7ad910Chris Lattner Value *SrcCast = new BitCastInst(*AI, VoidPtrTy, "tmp", TheCall); 266a7212e58260f6d1ead0c4eec7af400cf6c0d289eDuncan Sands 267c93adca35856d0eaae088e52ba30cfefbd7ad910Chris Lattner Value *Size; 268c93adca35856d0eaae088e52ba30cfefbd7ad910Chris Lattner if (TD == 0) 269c93adca35856d0eaae088e52ba30cfefbd7ad910Chris Lattner Size = ConstantExpr::getSizeOf(AggTy); 270c93adca35856d0eaae088e52ba30cfefbd7ad910Chris Lattner else 271c93adca35856d0eaae088e52ba30cfefbd7ad910Chris Lattner Size = ConstantInt::get(Type::Int64Ty, TD->getTypeStoreSize(AggTy)); 272a7212e58260f6d1ead0c4eec7af400cf6c0d289eDuncan Sands 273c93adca35856d0eaae088e52ba30cfefbd7ad910Chris Lattner // Always generate a memcpy of alignment 1 here because we don't know 274c93adca35856d0eaae088e52ba30cfefbd7ad910Chris Lattner // the alignment of the src pointer. Other optimizations can infer 275c93adca35856d0eaae088e52ba30cfefbd7ad910Chris Lattner // better alignment. 276c93adca35856d0eaae088e52ba30cfefbd7ad910Chris Lattner Value *CallArgs[] = { 277c93adca35856d0eaae088e52ba30cfefbd7ad910Chris Lattner DestCast, SrcCast, Size, ConstantInt::get(Type::Int32Ty, 1) 278c93adca35856d0eaae088e52ba30cfefbd7ad910Chris Lattner }; 279c93adca35856d0eaae088e52ba30cfefbd7ad910Chris Lattner CallInst *TheMemCpy = 280051a950000e21935165db56695e35bade668193bGabor Greif CallInst::Create(MemCpyFn, CallArgs, CallArgs+4, "", TheCall); 281a7212e58260f6d1ead0c4eec7af400cf6c0d289eDuncan Sands 282c93adca35856d0eaae088e52ba30cfefbd7ad910Chris Lattner // If we have a call graph, update it. 283c93adca35856d0eaae088e52ba30cfefbd7ad910Chris Lattner if (CG) { 284c93adca35856d0eaae088e52ba30cfefbd7ad910Chris Lattner CallGraphNode *MemCpyCGN = CG->getOrInsertFunction(MemCpyFn); 285c93adca35856d0eaae088e52ba30cfefbd7ad910Chris Lattner CallGraphNode *CallerNode = (*CG)[Caller]; 286c93adca35856d0eaae088e52ba30cfefbd7ad910Chris Lattner CallerNode->addCalledFunction(TheMemCpy, MemCpyCGN); 287c93adca35856d0eaae088e52ba30cfefbd7ad910Chris Lattner } 288a7212e58260f6d1ead0c4eec7af400cf6c0d289eDuncan Sands 289c93adca35856d0eaae088e52ba30cfefbd7ad910Chris Lattner // Uses of the argument in the function should use our new alloca 290c93adca35856d0eaae088e52ba30cfefbd7ad910Chris Lattner // instead. 291c93adca35856d0eaae088e52ba30cfefbd7ad910Chris Lattner ActualArg = NewAlloca; 292c93adca35856d0eaae088e52ba30cfefbd7ad910Chris Lattner } 293a7212e58260f6d1ead0c4eec7af400cf6c0d289eDuncan Sands 294c93adca35856d0eaae088e52ba30cfefbd7ad910Chris Lattner ValueMap[I] = ActualArg; 295c93adca35856d0eaae088e52ba30cfefbd7ad910Chris Lattner } 296fd93908ae8b9684fe71c239e3c6cfe13ff6a2663Misha Brukman 2975b5bc3032f97cfa7bfa3e22282d3a9c1ed05eec6Chris Lattner // We want the inliner to prune the code as it copies. We would LOVE to 2985b5bc3032f97cfa7bfa3e22282d3a9c1ed05eec6Chris Lattner // have no dead or constant instructions leftover after inlining occurs 2995b5bc3032f97cfa7bfa3e22282d3a9c1ed05eec6Chris Lattner // (which can happen, e.g., because an argument was constant), but we'll be 3005b5bc3032f97cfa7bfa3e22282d3a9c1ed05eec6Chris Lattner // happy with whatever the cloner can do. 3015b5bc3032f97cfa7bfa3e22282d3a9c1ed05eec6Chris Lattner CloneAndPruneFunctionInto(Caller, CalledFunc, ValueMap, Returns, ".i", 3021dfdf8255e803d6376f5fe94a113f892e796ae6cChris Lattner &InlinedFunctionInfo, TD); 303a7212e58260f6d1ead0c4eec7af400cf6c0d289eDuncan Sands 304d85340f4ec587e22b0239617f3b747a6df113894Chris Lattner // Remember the first block that is newly cloned over. 305d85340f4ec587e22b0239617f3b747a6df113894Chris Lattner FirstNewBlock = LastBlock; ++FirstNewBlock; 306a7212e58260f6d1ead0c4eec7af400cf6c0d289eDuncan Sands 307d85340f4ec587e22b0239617f3b747a6df113894Chris Lattner // Update the callgraph if requested. 308d85340f4ec587e22b0239617f3b747a6df113894Chris Lattner if (CG) 309d7b9851c4e634ed3599b1a4c70b1c76c90a11686Duncan Sands UpdateCallGraphAfterInlining(CS, FirstNewBlock, ValueMap, *CG); 310fd93908ae8b9684fe71c239e3c6cfe13ff6a2663Misha Brukman } 311a7212e58260f6d1ead0c4eec7af400cf6c0d289eDuncan Sands 312ca398dc3989d35e8516489fd163e012133bd41cbChris Lattner // If there are any alloca instructions in the block that used to be the entry 313ca398dc3989d35e8516489fd163e012133bd41cbChris Lattner // block for the callee, move them to the entry block of the caller. First 314ca398dc3989d35e8516489fd163e012133bd41cbChris Lattner // calculate which instruction they should be inserted before. We insert the 315ca398dc3989d35e8516489fd163e012133bd41cbChris Lattner // instructions at the end of the current alloca list. 316ca398dc3989d35e8516489fd163e012133bd41cbChris Lattner // 31721f20558d629f7ff8f64c20746d890d29328a544Chris Lattner { 31880a38d245359cb0a3be8f78f5d7d911232886b9aChris Lattner BasicBlock::iterator InsertPoint = Caller->begin()->begin(); 3195e923dee6024248f58fa83a7c7299437f44f0d1aChris Lattner for (BasicBlock::iterator I = FirstNewBlock->begin(), 3205e923dee6024248f58fa83a7c7299437f44f0d1aChris Lattner E = FirstNewBlock->end(); I != E; ) 32133bb3c8be355d179ece8e751f6e0f0978d0dd038Chris Lattner if (AllocaInst *AI = dyn_cast<AllocaInst>(I++)) { 32233bb3c8be355d179ece8e751f6e0f0978d0dd038Chris Lattner // If the alloca is now dead, remove it. This often occurs due to code 32333bb3c8be355d179ece8e751f6e0f0978d0dd038Chris Lattner // specialization. 32433bb3c8be355d179ece8e751f6e0f0978d0dd038Chris Lattner if (AI->use_empty()) { 32533bb3c8be355d179ece8e751f6e0f0978d0dd038Chris Lattner AI->eraseFromParent(); 32633bb3c8be355d179ece8e751f6e0f0978d0dd038Chris Lattner continue; 32733bb3c8be355d179ece8e751f6e0f0978d0dd038Chris Lattner } 328a7212e58260f6d1ead0c4eec7af400cf6c0d289eDuncan Sands 329f775f95369ba7d88a5cb8b6f1900241699d79351Chris Lattner if (isa<Constant>(AI->getArraySize())) { 33021f20558d629f7ff8f64c20746d890d29328a544Chris Lattner // Scan for the block of allocas that we can move over, and move them 33121f20558d629f7ff8f64c20746d890d29328a544Chris Lattner // all at once. 332c1df7e1799a7a97602bdedec818f7ab1dc514b4eChris Lattner while (isa<AllocaInst>(I) && 333c1df7e1799a7a97602bdedec818f7ab1dc514b4eChris Lattner isa<Constant>(cast<AllocaInst>(I)->getArraySize())) 334c1df7e1799a7a97602bdedec818f7ab1dc514b4eChris Lattner ++I; 335c1df7e1799a7a97602bdedec818f7ab1dc514b4eChris Lattner 336c1df7e1799a7a97602bdedec818f7ab1dc514b4eChris Lattner // Transfer all of the allocas over in a block. Using splice means 337e26bff22dbcfec2074a7502dd56683fc7f55912aDan Gohman // that the instructions aren't removed from the symbol table, then 338c1df7e1799a7a97602bdedec818f7ab1dc514b4eChris Lattner // reinserted. 339ecb7a77885b174cf4d001a9b48533b3979e7810dDan Gohman Caller->getEntryBlock().getInstList().splice( 340ecb7a77885b174cf4d001a9b48533b3979e7810dDan Gohman InsertPoint, 341ecb7a77885b174cf4d001a9b48533b3979e7810dDan Gohman FirstNewBlock->getInstList(), 342ecb7a77885b174cf4d001a9b48533b3979e7810dDan Gohman AI, I); 343f775f95369ba7d88a5cb8b6f1900241699d79351Chris Lattner } 34433bb3c8be355d179ece8e751f6e0f0978d0dd038Chris Lattner } 34580a38d245359cb0a3be8f78f5d7d911232886b9aChris Lattner } 34680a38d245359cb0a3be8f78f5d7d911232886b9aChris Lattner 347bf229f488a7541abd979cc3fbe9c3ce1c100e5c0Chris Lattner // If the inlined code contained dynamic alloca instructions, wrap the inlined 348bf229f488a7541abd979cc3fbe9c3ce1c100e5c0Chris Lattner // code with llvm.stacksave/llvm.stackrestore intrinsics. 349bf229f488a7541abd979cc3fbe9c3ce1c100e5c0Chris Lattner if (InlinedFunctionInfo.ContainsDynamicAllocas) { 350bf229f488a7541abd979cc3fbe9c3ce1c100e5c0Chris Lattner Module *M = Caller->getParent(); 351bf229f488a7541abd979cc3fbe9c3ce1c100e5c0Chris Lattner // Get the two intrinsics we care about. 352a121fddf3c34938d866ac4bb67247a479dedcd1bChris Lattner Constant *StackSave, *StackRestore; 3533d292aca0306fbb65da4622c80df01432ab6559bDuncan Sands StackSave = Intrinsic::getDeclaration(M, Intrinsic::stacksave); 3543d292aca0306fbb65da4622c80df01432ab6559bDuncan Sands StackRestore = Intrinsic::getDeclaration(M, Intrinsic::stackrestore); 355d85340f4ec587e22b0239617f3b747a6df113894Chris Lattner 356d85340f4ec587e22b0239617f3b747a6df113894Chris Lattner // If we are preserving the callgraph, add edges to the stacksave/restore 357d85340f4ec587e22b0239617f3b747a6df113894Chris Lattner // functions for the calls we insert. 35821ba23d0d88cff57dcdf104cd6914dabcbc68131Chris Lattner CallGraphNode *StackSaveCGN = 0, *StackRestoreCGN = 0, *CallerNode = 0; 359d85340f4ec587e22b0239617f3b747a6df113894Chris Lattner if (CG) { 360a121fddf3c34938d866ac4bb67247a479dedcd1bChris Lattner // We know that StackSave/StackRestore are Function*'s, because they are 361a121fddf3c34938d866ac4bb67247a479dedcd1bChris Lattner // intrinsics which must have the right types. 362a121fddf3c34938d866ac4bb67247a479dedcd1bChris Lattner StackSaveCGN = CG->getOrInsertFunction(cast<Function>(StackSave)); 363a121fddf3c34938d866ac4bb67247a479dedcd1bChris Lattner StackRestoreCGN = CG->getOrInsertFunction(cast<Function>(StackRestore)); 364d85340f4ec587e22b0239617f3b747a6df113894Chris Lattner CallerNode = (*CG)[Caller]; 365d85340f4ec587e22b0239617f3b747a6df113894Chris Lattner } 366a7212e58260f6d1ead0c4eec7af400cf6c0d289eDuncan Sands 367bf229f488a7541abd979cc3fbe9c3ce1c100e5c0Chris Lattner // Insert the llvm.stacksave. 368a7212e58260f6d1ead0c4eec7af400cf6c0d289eDuncan Sands CallInst *SavedPtr = CallInst::Create(StackSave, "savedstack", 369051a950000e21935165db56695e35bade668193bGabor Greif FirstNewBlock->begin()); 370d85340f4ec587e22b0239617f3b747a6df113894Chris Lattner if (CG) CallerNode->addCalledFunction(SavedPtr, StackSaveCGN); 371a7212e58260f6d1ead0c4eec7af400cf6c0d289eDuncan Sands 372bf229f488a7541abd979cc3fbe9c3ce1c100e5c0Chris Lattner // Insert a call to llvm.stackrestore before any return instructions in the 373bf229f488a7541abd979cc3fbe9c3ce1c100e5c0Chris Lattner // inlined function. 374d85340f4ec587e22b0239617f3b747a6df113894Chris Lattner for (unsigned i = 0, e = Returns.size(); i != e; ++i) { 375051a950000e21935165db56695e35bade668193bGabor Greif CallInst *CI = CallInst::Create(StackRestore, SavedPtr, "", Returns[i]); 376d85340f4ec587e22b0239617f3b747a6df113894Chris Lattner if (CG) CallerNode->addCalledFunction(CI, StackRestoreCGN); 377d85340f4ec587e22b0239617f3b747a6df113894Chris Lattner } 378468fb1df7db466e5682ee44341c3990b599e8d6aChris Lattner 379468fb1df7db466e5682ee44341c3990b599e8d6aChris Lattner // Count the number of StackRestore calls we insert. 380468fb1df7db466e5682ee44341c3990b599e8d6aChris Lattner unsigned NumStackRestores = Returns.size(); 381a7212e58260f6d1ead0c4eec7af400cf6c0d289eDuncan Sands 382bf229f488a7541abd979cc3fbe9c3ce1c100e5c0Chris Lattner // If we are inlining an invoke instruction, insert restores before each 383bf229f488a7541abd979cc3fbe9c3ce1c100e5c0Chris Lattner // unwind. These unwinds will be rewritten into branches later. 384bf229f488a7541abd979cc3fbe9c3ce1c100e5c0Chris Lattner if (InlinedFunctionInfo.ContainsUnwinds && isa<InvokeInst>(TheCall)) { 385bf229f488a7541abd979cc3fbe9c3ce1c100e5c0Chris Lattner for (Function::iterator BB = FirstNewBlock, E = Caller->end(); 386bf229f488a7541abd979cc3fbe9c3ce1c100e5c0Chris Lattner BB != E; ++BB) 387468fb1df7db466e5682ee44341c3990b599e8d6aChris Lattner if (UnwindInst *UI = dyn_cast<UnwindInst>(BB->getTerminator())) { 3883d292aca0306fbb65da4622c80df01432ab6559bDuncan Sands CallInst::Create(StackRestore, SavedPtr, "", UI); 389468fb1df7db466e5682ee44341c3990b599e8d6aChris Lattner ++NumStackRestores; 390468fb1df7db466e5682ee44341c3990b599e8d6aChris Lattner } 391468fb1df7db466e5682ee44341c3990b599e8d6aChris Lattner } 392bf229f488a7541abd979cc3fbe9c3ce1c100e5c0Chris Lattner } 393bf229f488a7541abd979cc3fbe9c3ce1c100e5c0Chris Lattner 394a7212e58260f6d1ead0c4eec7af400cf6c0d289eDuncan Sands // If we are inlining tail call instruction through a call site that isn't 3951fdf4a859f03ce5aa4ce9acba29ce321c847388eChris Lattner // marked 'tail', we must remove the tail marker for any calls in the inlined 396f0c3354d998507515ab39e26b5292ea0ceb06aefDuncan Sands // code. Also, calls inlined through a 'nounwind' call site should be marked 397f0c3354d998507515ab39e26b5292ea0ceb06aefDuncan Sands // 'nounwind'. 398f0c3354d998507515ab39e26b5292ea0ceb06aefDuncan Sands if (InlinedFunctionInfo.ContainsCalls && 399f0c3354d998507515ab39e26b5292ea0ceb06aefDuncan Sands (MustClearTailCallFlags || MarkNoUnwind)) { 4001b49141821e98e4321bfe6234c7001c836b2a289Chris Lattner for (Function::iterator BB = FirstNewBlock, E = Caller->end(); 4011b49141821e98e4321bfe6234c7001c836b2a289Chris Lattner BB != E; ++BB) 4021b49141821e98e4321bfe6234c7001c836b2a289Chris Lattner for (BasicBlock::iterator I = BB->begin(), E = BB->end(); I != E; ++I) 403f0c3354d998507515ab39e26b5292ea0ceb06aefDuncan Sands if (CallInst *CI = dyn_cast<CallInst>(I)) { 404f0c3354d998507515ab39e26b5292ea0ceb06aefDuncan Sands if (MustClearTailCallFlags) 405f0c3354d998507515ab39e26b5292ea0ceb06aefDuncan Sands CI->setTailCall(false); 406f0c3354d998507515ab39e26b5292ea0ceb06aefDuncan Sands if (MarkNoUnwind) 407f0c3354d998507515ab39e26b5292ea0ceb06aefDuncan Sands CI->setDoesNotThrow(); 408f0c3354d998507515ab39e26b5292ea0ceb06aefDuncan Sands } 4091b49141821e98e4321bfe6234c7001c836b2a289Chris Lattner } 4101b49141821e98e4321bfe6234c7001c836b2a289Chris Lattner 411f0c3354d998507515ab39e26b5292ea0ceb06aefDuncan Sands // If we are inlining through a 'nounwind' call site then any inlined 'unwind' 412f0c3354d998507515ab39e26b5292ea0ceb06aefDuncan Sands // instructions are unreachable. 413f0c3354d998507515ab39e26b5292ea0ceb06aefDuncan Sands if (InlinedFunctionInfo.ContainsUnwinds && MarkNoUnwind) 414f0c3354d998507515ab39e26b5292ea0ceb06aefDuncan Sands for (Function::iterator BB = FirstNewBlock, E = Caller->end(); 415f0c3354d998507515ab39e26b5292ea0ceb06aefDuncan Sands BB != E; ++BB) { 416f0c3354d998507515ab39e26b5292ea0ceb06aefDuncan Sands TerminatorInst *Term = BB->getTerminator(); 417f0c3354d998507515ab39e26b5292ea0ceb06aefDuncan Sands if (isa<UnwindInst>(Term)) { 418f0c3354d998507515ab39e26b5292ea0ceb06aefDuncan Sands new UnreachableInst(Term); 419f0c3354d998507515ab39e26b5292ea0ceb06aefDuncan Sands BB->getInstList().erase(Term); 420f0c3354d998507515ab39e26b5292ea0ceb06aefDuncan Sands } 421f0c3354d998507515ab39e26b5292ea0ceb06aefDuncan Sands } 422f0c3354d998507515ab39e26b5292ea0ceb06aefDuncan Sands 4235e923dee6024248f58fa83a7c7299437f44f0d1aChris Lattner // If we are inlining for an invoke instruction, we must make sure to rewrite 4245e923dee6024248f58fa83a7c7299437f44f0d1aChris Lattner // any inlined 'unwind' instructions into branches to the invoke exception 4255e923dee6024248f58fa83a7c7299437f44f0d1aChris Lattner // destination, and call instructions into invoke instructions. 426cd4d339ec187182c9abc22b80560349f8ba5010fChris Lattner if (InvokeInst *II = dyn_cast<InvokeInst>(TheCall)) 427cd4d339ec187182c9abc22b80560349f8ba5010fChris Lattner HandleInlinedInvoke(II, FirstNewBlock, InlinedFunctionInfo); 4285e923dee6024248f58fa83a7c7299437f44f0d1aChris Lattner 42944a6807f4f785ecdd96b3aa67dad056677131b98Chris Lattner // If we cloned in _exactly one_ basic block, and if that block ends in a 43044a6807f4f785ecdd96b3aa67dad056677131b98Chris Lattner // return instruction, we splice the body of the inlined callee directly into 43144a6807f4f785ecdd96b3aa67dad056677131b98Chris Lattner // the calling basic block. 43244a6807f4f785ecdd96b3aa67dad056677131b98Chris Lattner if (Returns.size() == 1 && std::distance(FirstNewBlock, Caller->end()) == 1) { 43344a6807f4f785ecdd96b3aa67dad056677131b98Chris Lattner // Move all of the instructions right before the call. 43444a6807f4f785ecdd96b3aa67dad056677131b98Chris Lattner OrigBB->getInstList().splice(TheCall, FirstNewBlock->getInstList(), 43544a6807f4f785ecdd96b3aa67dad056677131b98Chris Lattner FirstNewBlock->begin(), FirstNewBlock->end()); 43644a6807f4f785ecdd96b3aa67dad056677131b98Chris Lattner // Remove the cloned basic block. 43744a6807f4f785ecdd96b3aa67dad056677131b98Chris Lattner Caller->getBasicBlockList().pop_back(); 438fd93908ae8b9684fe71c239e3c6cfe13ff6a2663Misha Brukman 43944a6807f4f785ecdd96b3aa67dad056677131b98Chris Lattner // If the call site was an invoke instruction, add a branch to the normal 44044a6807f4f785ecdd96b3aa67dad056677131b98Chris Lattner // destination. 44144a6807f4f785ecdd96b3aa67dad056677131b98Chris Lattner if (InvokeInst *II = dyn_cast<InvokeInst>(TheCall)) 442051a950000e21935165db56695e35bade668193bGabor Greif BranchInst::Create(II->getNormalDest(), TheCall); 44344a6807f4f785ecdd96b3aa67dad056677131b98Chris Lattner 44444a6807f4f785ecdd96b3aa67dad056677131b98Chris Lattner // If the return instruction returned a value, replace uses of the call with 44544a6807f4f785ecdd96b3aa67dad056677131b98Chris Lattner // uses of the returned value. 446dc00d42bb18a6748f43c365d9bd30c1ed0e800acDevang Patel if (!TheCall->use_empty()) { 447dc00d42bb18a6748f43c365d9bd30c1ed0e800acDevang Patel ReturnInst *R = Returns[0]; 448fc74abfba5128544a750fce22fdf13eb0403e3ceDan Gohman TheCall->replaceAllUsesWith(R->getReturnValue()); 449dc00d42bb18a6748f43c365d9bd30c1ed0e800acDevang Patel } 45044a6807f4f785ecdd96b3aa67dad056677131b98Chris Lattner // Since we are now done with the Call/Invoke, we can delete it. 4511adec83ae84031bfa9f0bf209c5ee6c64906a1ffDan Gohman TheCall->eraseFromParent(); 45244a6807f4f785ecdd96b3aa67dad056677131b98Chris Lattner 45344a6807f4f785ecdd96b3aa67dad056677131b98Chris Lattner // Since we are now done with the return instruction, delete it also. 4541adec83ae84031bfa9f0bf209c5ee6c64906a1ffDan Gohman Returns[0]->eraseFromParent(); 45544a6807f4f785ecdd96b3aa67dad056677131b98Chris Lattner 45644a6807f4f785ecdd96b3aa67dad056677131b98Chris Lattner // We are now done with the inlining. 45744a6807f4f785ecdd96b3aa67dad056677131b98Chris Lattner return true; 45844a6807f4f785ecdd96b3aa67dad056677131b98Chris Lattner } 45944a6807f4f785ecdd96b3aa67dad056677131b98Chris Lattner 46044a6807f4f785ecdd96b3aa67dad056677131b98Chris Lattner // Otherwise, we have the normal case, of more than one block to inline or 46144a6807f4f785ecdd96b3aa67dad056677131b98Chris Lattner // multiple return sites. 46244a6807f4f785ecdd96b3aa67dad056677131b98Chris Lattner 4635e923dee6024248f58fa83a7c7299437f44f0d1aChris Lattner // We want to clone the entire callee function into the hole between the 4645e923dee6024248f58fa83a7c7299437f44f0d1aChris Lattner // "starter" and "ender" blocks. How we accomplish this depends on whether 4655e923dee6024248f58fa83a7c7299437f44f0d1aChris Lattner // this is an invoke instruction or a call instruction. 4665e923dee6024248f58fa83a7c7299437f44f0d1aChris Lattner BasicBlock *AfterCallBB; 4675e923dee6024248f58fa83a7c7299437f44f0d1aChris Lattner if (InvokeInst *II = dyn_cast<InvokeInst>(TheCall)) { 468fd93908ae8b9684fe71c239e3c6cfe13ff6a2663Misha Brukman 4695e923dee6024248f58fa83a7c7299437f44f0d1aChris Lattner // Add an unconditional branch to make this look like the CallInst case... 470051a950000e21935165db56695e35bade668193bGabor Greif BranchInst *NewBr = BranchInst::Create(II->getNormalDest(), TheCall); 471fd93908ae8b9684fe71c239e3c6cfe13ff6a2663Misha Brukman 4725e923dee6024248f58fa83a7c7299437f44f0d1aChris Lattner // Split the basic block. This guarantees that no PHI nodes will have to be 4735e923dee6024248f58fa83a7c7299437f44f0d1aChris Lattner // updated due to new incoming edges, and make the invoke case more 4745e923dee6024248f58fa83a7c7299437f44f0d1aChris Lattner // symmetric to the call case. 4755e923dee6024248f58fa83a7c7299437f44f0d1aChris Lattner AfterCallBB = OrigBB->splitBasicBlock(NewBr, 476284d1b88273eb1967c8faef407f1167791c760e0Chris Lattner CalledFunc->getName()+".exit"); 477fd93908ae8b9684fe71c239e3c6cfe13ff6a2663Misha Brukman 4785e923dee6024248f58fa83a7c7299437f44f0d1aChris Lattner } else { // It's a call 47944a6807f4f785ecdd96b3aa67dad056677131b98Chris Lattner // If this is a call instruction, we need to split the basic block that 48044a6807f4f785ecdd96b3aa67dad056677131b98Chris Lattner // the call lives in. 4815e923dee6024248f58fa83a7c7299437f44f0d1aChris Lattner // 4825e923dee6024248f58fa83a7c7299437f44f0d1aChris Lattner AfterCallBB = OrigBB->splitBasicBlock(TheCall, 483284d1b88273eb1967c8faef407f1167791c760e0Chris Lattner CalledFunc->getName()+".exit"); 4845e923dee6024248f58fa83a7c7299437f44f0d1aChris Lattner } 4855e923dee6024248f58fa83a7c7299437f44f0d1aChris Lattner 48644a6807f4f785ecdd96b3aa67dad056677131b98Chris Lattner // Change the branch that used to go to AfterCallBB to branch to the first 48744a6807f4f785ecdd96b3aa67dad056677131b98Chris Lattner // basic block of the inlined function. 48844a6807f4f785ecdd96b3aa67dad056677131b98Chris Lattner // 48944a6807f4f785ecdd96b3aa67dad056677131b98Chris Lattner TerminatorInst *Br = OrigBB->getTerminator(); 490fd93908ae8b9684fe71c239e3c6cfe13ff6a2663Misha Brukman assert(Br && Br->getOpcode() == Instruction::Br && 49144a6807f4f785ecdd96b3aa67dad056677131b98Chris Lattner "splitBasicBlock broken!"); 49244a6807f4f785ecdd96b3aa67dad056677131b98Chris Lattner Br->setOperand(0, FirstNewBlock); 49344a6807f4f785ecdd96b3aa67dad056677131b98Chris Lattner 49444a6807f4f785ecdd96b3aa67dad056677131b98Chris Lattner 49544a6807f4f785ecdd96b3aa67dad056677131b98Chris Lattner // Now that the function is correct, make it a little bit nicer. In 49644a6807f4f785ecdd96b3aa67dad056677131b98Chris Lattner // particular, move the basic blocks inserted from the end of the function 49744a6807f4f785ecdd96b3aa67dad056677131b98Chris Lattner // into the space made by splitting the source basic block. 49844a6807f4f785ecdd96b3aa67dad056677131b98Chris Lattner Caller->getBasicBlockList().splice(AfterCallBB, Caller->getBasicBlockList(), 49944a6807f4f785ecdd96b3aa67dad056677131b98Chris Lattner FirstNewBlock, Caller->end()); 50044a6807f4f785ecdd96b3aa67dad056677131b98Chris Lattner 5015e923dee6024248f58fa83a7c7299437f44f0d1aChris Lattner // Handle all of the return instructions that we just cloned in, and eliminate 5025e923dee6024248f58fa83a7c7299437f44f0d1aChris Lattner // any users of the original call/invoke instruction. 503b8f198af1b62f2ed48dcb914973a9d211dcba38bDevang Patel const Type *RTy = CalledFunc->getReturnType(); 5042c31750cd0ebdc83a890ace97dbb6249b3abe44eDan Gohman 505fc74abfba5128544a750fce22fdf13eb0403e3ceDan Gohman if (Returns.size() > 1) { 5065e923dee6024248f58fa83a7c7299437f44f0d1aChris Lattner // The PHI node should go at the front of the new basic block to merge all 5075e923dee6024248f58fa83a7c7299437f44f0d1aChris Lattner // possible incoming values. 508fc74abfba5128544a750fce22fdf13eb0403e3ceDan Gohman PHINode *PHI = 0; 5095e923dee6024248f58fa83a7c7299437f44f0d1aChris Lattner if (!TheCall->use_empty()) { 510fc74abfba5128544a750fce22fdf13eb0403e3ceDan Gohman PHI = PHINode::Create(RTy, TheCall->getName(), 511fc74abfba5128544a750fce22fdf13eb0403e3ceDan Gohman AfterCallBB->begin()); 512fc74abfba5128544a750fce22fdf13eb0403e3ceDan Gohman // Anything that used the result of the function call should now use the 513fc74abfba5128544a750fce22fdf13eb0403e3ceDan Gohman // PHI node as their operand. 514a7212e58260f6d1ead0c4eec7af400cf6c0d289eDuncan Sands TheCall->replaceAllUsesWith(PHI); 5155e923dee6024248f58fa83a7c7299437f44f0d1aChris Lattner } 516fd93908ae8b9684fe71c239e3c6cfe13ff6a2663Misha Brukman 51712a466b9d0e27be453cfa05cff18acc9d7c1cfbaDevang Patel // Loop over all of the return instructions adding entries to the PHI node as 5185e923dee6024248f58fa83a7c7299437f44f0d1aChris Lattner // appropriate. 519fc74abfba5128544a750fce22fdf13eb0403e3ceDan Gohman if (PHI) { 520fc74abfba5128544a750fce22fdf13eb0403e3ceDan Gohman for (unsigned i = 0, e = Returns.size(); i != e; ++i) { 521fc74abfba5128544a750fce22fdf13eb0403e3ceDan Gohman ReturnInst *RI = Returns[i]; 522fc74abfba5128544a750fce22fdf13eb0403e3ceDan Gohman assert(RI->getReturnValue()->getType() == PHI->getType() && 523fc74abfba5128544a750fce22fdf13eb0403e3ceDan Gohman "Ret value not consistent in function!"); 524fc74abfba5128544a750fce22fdf13eb0403e3ceDan Gohman PHI->addIncoming(RI->getReturnValue(), RI->getParent()); 5255e923dee6024248f58fa83a7c7299437f44f0d1aChris Lattner } 52612a466b9d0e27be453cfa05cff18acc9d7c1cfbaDevang Patel } 527fd93908ae8b9684fe71c239e3c6cfe13ff6a2663Misha Brukman 52812a466b9d0e27be453cfa05cff18acc9d7c1cfbaDevang Patel // Add a branch to the merge points and remove retrun instructions. 52912a466b9d0e27be453cfa05cff18acc9d7c1cfbaDevang Patel for (unsigned i = 0, e = Returns.size(); i != e; ++i) { 53012a466b9d0e27be453cfa05cff18acc9d7c1cfbaDevang Patel ReturnInst *RI = Returns[i]; 531051a950000e21935165db56695e35bade668193bGabor Greif BranchInst::Create(AfterCallBB, RI); 532b8f198af1b62f2ed48dcb914973a9d211dcba38bDevang Patel RI->eraseFromParent(); 5335e923dee6024248f58fa83a7c7299437f44f0d1aChris Lattner } 534b8f198af1b62f2ed48dcb914973a9d211dcba38bDevang Patel } else if (!Returns.empty()) { 535b8f198af1b62f2ed48dcb914973a9d211dcba38bDevang Patel // Otherwise, if there is exactly one return value, just replace anything 536b8f198af1b62f2ed48dcb914973a9d211dcba38bDevang Patel // using the return value of the call with the computed value. 537b8f198af1b62f2ed48dcb914973a9d211dcba38bDevang Patel if (!TheCall->use_empty()) 538b8f198af1b62f2ed48dcb914973a9d211dcba38bDevang Patel TheCall->replaceAllUsesWith(Returns[0]->getReturnValue()); 539a7212e58260f6d1ead0c4eec7af400cf6c0d289eDuncan Sands 540b8f198af1b62f2ed48dcb914973a9d211dcba38bDevang Patel // Splice the code from the return block into the block that it will return 541b8f198af1b62f2ed48dcb914973a9d211dcba38bDevang Patel // to, which contains the code that was after the call. 542b8f198af1b62f2ed48dcb914973a9d211dcba38bDevang Patel BasicBlock *ReturnBB = Returns[0]->getParent(); 543b8f198af1b62f2ed48dcb914973a9d211dcba38bDevang Patel AfterCallBB->getInstList().splice(AfterCallBB->begin(), 544b8f198af1b62f2ed48dcb914973a9d211dcba38bDevang Patel ReturnBB->getInstList()); 545a7212e58260f6d1ead0c4eec7af400cf6c0d289eDuncan Sands 546b8f198af1b62f2ed48dcb914973a9d211dcba38bDevang Patel // Update PHI nodes that use the ReturnBB to use the AfterCallBB. 547b8f198af1b62f2ed48dcb914973a9d211dcba38bDevang Patel ReturnBB->replaceAllUsesWith(AfterCallBB); 548a7212e58260f6d1ead0c4eec7af400cf6c0d289eDuncan Sands 549b8f198af1b62f2ed48dcb914973a9d211dcba38bDevang Patel // Delete the return instruction now and empty ReturnBB now. 550b8f198af1b62f2ed48dcb914973a9d211dcba38bDevang Patel Returns[0]->eraseFromParent(); 551b8f198af1b62f2ed48dcb914973a9d211dcba38bDevang Patel ReturnBB->eraseFromParent(); 5523787e765facfad5ea62753922d940bcdd52afd57Chris Lattner } else if (!TheCall->use_empty()) { 5533787e765facfad5ea62753922d940bcdd52afd57Chris Lattner // No returns, but something is using the return value of the call. Just 5543787e765facfad5ea62753922d940bcdd52afd57Chris Lattner // nuke the result. 5553787e765facfad5ea62753922d940bcdd52afd57Chris Lattner TheCall->replaceAllUsesWith(UndefValue::get(TheCall->getType())); 5565e923dee6024248f58fa83a7c7299437f44f0d1aChris Lattner } 557fd93908ae8b9684fe71c239e3c6cfe13ff6a2663Misha Brukman 5585e923dee6024248f58fa83a7c7299437f44f0d1aChris Lattner // Since we are now done with the Call/Invoke, we can delete it. 5593787e765facfad5ea62753922d940bcdd52afd57Chris Lattner TheCall->eraseFromParent(); 560ca398dc3989d35e8516489fd163e012133bd41cbChris Lattner 5617152c237b46a920b29d5605af934766b8f9a07a1Chris Lattner // We should always be able to fold the entry block of the function into the 5627152c237b46a920b29d5605af934766b8f9a07a1Chris Lattner // single predecessor of the block... 563cd01ae5c7071fb99a665b2bbea7428d769792ab8Chris Lattner assert(cast<BranchInst>(Br)->isUnconditional() && "splitBasicBlock broken!"); 5647152c237b46a920b29d5605af934766b8f9a07a1Chris Lattner BasicBlock *CalleeEntry = cast<BranchInst>(Br)->getSuccessor(0); 56544a6807f4f785ecdd96b3aa67dad056677131b98Chris Lattner 566cd01ae5c7071fb99a665b2bbea7428d769792ab8Chris Lattner // Splice the code entry block into calling block, right before the 567cd01ae5c7071fb99a665b2bbea7428d769792ab8Chris Lattner // unconditional branch. 568cd01ae5c7071fb99a665b2bbea7428d769792ab8Chris Lattner OrigBB->getInstList().splice(Br, CalleeEntry->getInstList()); 569cd01ae5c7071fb99a665b2bbea7428d769792ab8Chris Lattner CalleeEntry->replaceAllUsesWith(OrigBB); // Update PHI nodes 570cd01ae5c7071fb99a665b2bbea7428d769792ab8Chris Lattner 571cd01ae5c7071fb99a665b2bbea7428d769792ab8Chris Lattner // Remove the unconditional branch. 572cd01ae5c7071fb99a665b2bbea7428d769792ab8Chris Lattner OrigBB->getInstList().erase(Br); 573cd01ae5c7071fb99a665b2bbea7428d769792ab8Chris Lattner 574cd01ae5c7071fb99a665b2bbea7428d769792ab8Chris Lattner // Now we can remove the CalleeEntry block, which is now empty. 575cd01ae5c7071fb99a665b2bbea7428d769792ab8Chris Lattner Caller->getBasicBlockList().erase(CalleeEntry); 576a7212e58260f6d1ead0c4eec7af400cf6c0d289eDuncan Sands 577ca398dc3989d35e8516489fd163e012133bd41cbChris Lattner return true; 578ca398dc3989d35e8516489fd163e012133bd41cbChris Lattner} 579