From: Bill Wendling Date: Fri, 17 Dec 2010 23:09:14 +0000 (+0000) Subject: During local stack slot allocation, the materializeFrameBaseRegister function X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=976ef86689ed065361a748f81c44ca3510af2202;p=oota-llvm.git During local stack slot allocation, the materializeFrameBaseRegister function may be called. If the entry block is empty, the insertion point iterator will be the "end()" value. Calling ->getParent() on it (among others) causes problems. Modify materializeFrameBaseRegister to take the machine basic block and insert the frame base register at the beginning of that block. (It's very similar to what the code does all ready. The only difference is that it will always insert at the beginning of the entry block instead of after a previous materialization of the frame base register. I doubt that that matters here.) git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122104 91177308-0d34-0410-b5e6-96231b3b80d8 --- diff --git a/include/llvm/Target/TargetRegisterInfo.h b/include/llvm/Target/TargetRegisterInfo.h index ceb61300ae1..05ccf04ec76 100644 --- a/include/llvm/Target/TargetRegisterInfo.h +++ b/include/llvm/Target/TargetRegisterInfo.h @@ -644,7 +644,7 @@ public: /// materializeFrameBaseRegister - Insert defining instruction(s) for /// BaseReg to be a pointer to FrameIdx before insertion point I. - virtual void materializeFrameBaseRegister(MachineBasicBlock::iterator I, + virtual void materializeFrameBaseRegister(MachineBasicBlock *MBB, unsigned BaseReg, int FrameIdx, int64_t Offset) const { assert(0 && "materializeFrameBaseRegister does not exist on this target"); diff --git a/lib/CodeGen/LocalStackSlotAllocation.cpp b/lib/CodeGen/LocalStackSlotAllocation.cpp index 7e366f0ceec..38a69825534 100644 --- a/lib/CodeGen/LocalStackSlotAllocation.cpp +++ b/lib/CodeGen/LocalStackSlotAllocation.cpp @@ -230,24 +230,25 @@ bool LocalStackSlotPass::insertFrameReferenceRegisters(MachineFunction &Fn) { const TargetFrameInfo &TFI = *Fn.getTarget().getFrameInfo(); bool StackGrowsDown = TFI.getStackGrowthDirection() == TargetFrameInfo::StackGrowsDown; - MachineBasicBlock::iterator InsertionPt = Fn.begin()->begin(); // Collect all of the instructions in the block that reference // a frame index. Also store the frame index referenced to ease later // lookup. (For any insn that has more than one FI reference, we arbitrarily // choose the first one). SmallVector FrameReferenceInsns; - // A base register definition is a register+offset pair. - SmallVector, 8> BaseRegisters; + // A base register definition is a register + offset pair. + SmallVector, 8> BaseRegisters; for (MachineFunction::iterator BB = Fn.begin(), E = Fn.end(); BB != E; ++BB) { for (MachineBasicBlock::iterator I = BB->begin(); I != BB->end(); ++I) { MachineInstr *MI = I; + // Debug value instructions can't be out of range, so they don't need // any updates. if (MI->isDebugValue()) continue; + // For now, allocate the base register(s) within the basic block // where they're used, and don't try to keep them around outside // of that. It may be beneficial to try sharing them more broadly @@ -268,11 +269,13 @@ bool LocalStackSlotPass::insertFrameReferenceRegisters(MachineFunction &Fn) { } } } + // Sort the frame references by local offset array_pod_sort(FrameReferenceInsns.begin(), FrameReferenceInsns.end()); + MachineBasicBlock *Entry = Fn.begin(); - // Loop throught the frame references and allocate for them as necessary + // Loop through the frame references and allocate for them as necessary. for (int ref = 0, e = FrameReferenceInsns.size(); ref < e ; ++ref) { MachineBasicBlock::iterator I = FrameReferenceInsns[ref].getMachineInstr(); @@ -321,10 +324,12 @@ bool LocalStackSlotPass::insertFrameReferenceRegisters(MachineFunction &Fn) { DEBUG(dbgs() << " Materializing base register " << BaseReg << " at frame local offset " << LocalOffsets[FrameIdx] + InstrOffset << "\n"); + // Tell the target to insert the instruction to initialize // the base register. - TRI->materializeFrameBaseRegister(InsertionPt, BaseReg, - FrameIdx, InstrOffset); + // MachineBasicBlock::iterator InsertionPt = Entry->begin(); + TRI->materializeFrameBaseRegister(Entry, BaseReg, FrameIdx, + InstrOffset); // The base register already includes any offset specified // by the instruction, so account for that so it doesn't get diff --git a/lib/Target/ARM/ARMBaseRegisterInfo.cpp b/lib/Target/ARM/ARMBaseRegisterInfo.cpp index bdecaca37d0..9928105d214 100644 --- a/lib/Target/ARM/ARMBaseRegisterInfo.cpp +++ b/lib/Target/ARM/ARMBaseRegisterInfo.cpp @@ -1029,19 +1029,25 @@ needsFrameBaseReg(MachineInstr *MI, int64_t Offset) const { return true; } -/// materializeFrameBaseRegister - Insert defining instruction(s) for -/// BaseReg to be a pointer to FrameIdx before insertion point I. +/// materializeFrameBaseRegister - Insert defining instruction(s) for BaseReg to +/// be a pointer to FrameIdx at the beginning of the basic block. void ARMBaseRegisterInfo:: -materializeFrameBaseRegister(MachineBasicBlock::iterator I, unsigned BaseReg, - int FrameIdx, int64_t Offset) const { - ARMFunctionInfo *AFI = - I->getParent()->getParent()->getInfo(); +materializeFrameBaseRegister(MachineBasicBlock *MBB, + unsigned BaseReg, int FrameIdx, + int64_t Offset) const { + ARMFunctionInfo *AFI = MBB->getParent()->getInfo(); unsigned ADDriOpc = !AFI->isThumbFunction() ? ARM::ADDri : (AFI->isThumb1OnlyFunction() ? ARM::tADDrSPi : ARM::t2ADDri); + MachineBasicBlock::iterator Ins = MBB->begin(); + DebugLoc DL; // Defaults to "unknown" + if (Ins != MBB->end()) + DL = Ins->getDebugLoc(); + MachineInstrBuilder MIB = - BuildMI(*I->getParent(), I, I->getDebugLoc(), TII.get(ADDriOpc), BaseReg) + BuildMI(*MBB, Ins, DL, TII.get(ADDriOpc), BaseReg) .addFrameIndex(FrameIdx).addImm(Offset); + if (!AFI->isThumb1OnlyFunction()) AddDefaultCC(AddDefaultPred(MIB)); } diff --git a/lib/Target/ARM/ARMBaseRegisterInfo.h b/lib/Target/ARM/ARMBaseRegisterInfo.h index 23a466fad95..ba6bd2b3208 100644 --- a/lib/Target/ARM/ARMBaseRegisterInfo.h +++ b/lib/Target/ARM/ARMBaseRegisterInfo.h @@ -145,7 +145,7 @@ public: bool needsStackRealignment(const MachineFunction &MF) const; int64_t getFrameIndexInstrOffset(const MachineInstr *MI, int Idx) const; bool needsFrameBaseReg(MachineInstr *MI, int64_t Offset) const; - void materializeFrameBaseRegister(MachineBasicBlock::iterator I, + void materializeFrameBaseRegister(MachineBasicBlock *MBB, unsigned BaseReg, int FrameIdx, int64_t Offset) const; void resolveFrameIndex(MachineBasicBlock::iterator I, diff --git a/test/CodeGen/ARM/2010-12-17-LocalStackSlotCrash.ll b/test/CodeGen/ARM/2010-12-17-LocalStackSlotCrash.ll new file mode 100644 index 00000000000..a2f50b587b2 --- /dev/null +++ b/test/CodeGen/ARM/2010-12-17-LocalStackSlotCrash.ll @@ -0,0 +1,15 @@ +; RUN: llc < %s -mtriple=armv6-apple-darwin10 +; +target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:32:64-v128:32:128-a0:0:64-n32" +target triple = "armv6-apple-darwin10" + +define void @func() nounwind optsize { +entry: + %buf = alloca [8096 x i8], align 1 + br label %bb + +bb: + %p.2 = getelementptr [8096 x i8]* %buf, i32 0, i32 0 + store i8 undef, i8* %p.2, align 1 + ret void +}