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This adds a safe interface to the machine independent InputArg struct for accessing the index of the original (IR-level) argument. When a non-native return type is lowered, we generate the hidden machine-level sret argument on-the-fly. Before this fix, we were representing this argument as OrigArgIndex == 0, which is an outright lie. In particular this crashed in the AArch64 backend where we actually try to access the type of the original argument. Now we use a sentinel value for machine arguments that have no original argument index. AArch64, ARM, Mips, and PPC now check for this case before accessing the original argument. Fixes <rdar://19792160> Null pointer assertion in AArch64TargetLowering git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@229413 91177308-0d34-0410-b5e6-96231b3b80d8
143 lines
5.4 KiB
C++
143 lines
5.4 KiB
C++
//===---- MipsCCState.cpp - CCState with Mips specific extensions ---------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#include "MipsCCState.h"
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#include "MipsSubtarget.h"
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#include "llvm/IR/Module.h"
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using namespace llvm;
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/// This function returns true if CallSym is a long double emulation routine.
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static bool isF128SoftLibCall(const char *CallSym) {
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const char *const LibCalls[] = {
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"__addtf3", "__divtf3", "__eqtf2", "__extenddftf2",
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"__extendsftf2", "__fixtfdi", "__fixtfsi", "__fixtfti",
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"__fixunstfdi", "__fixunstfsi", "__fixunstfti", "__floatditf",
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"__floatsitf", "__floattitf", "__floatunditf", "__floatunsitf",
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"__floatuntitf", "__getf2", "__gttf2", "__letf2",
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"__lttf2", "__multf3", "__netf2", "__powitf2",
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"__subtf3", "__trunctfdf2", "__trunctfsf2", "__unordtf2",
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"ceill", "copysignl", "cosl", "exp2l",
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"expl", "floorl", "fmal", "fmodl",
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"log10l", "log2l", "logl", "nearbyintl",
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"powl", "rintl", "sinl", "sqrtl",
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"truncl"};
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const char *const *End = LibCalls + array_lengthof(LibCalls);
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// Check that LibCalls is sorted alphabetically.
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MipsTargetLowering::LTStr Comp;
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#ifndef NDEBUG
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for (const char *const *I = LibCalls; I < End - 1; ++I)
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assert(Comp(*I, *(I + 1)));
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#endif
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return std::binary_search(LibCalls, End, CallSym, Comp);
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}
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/// This function returns true if Ty is fp128, {f128} or i128 which was
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/// originally a fp128.
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static bool originalTypeIsF128(const Type *Ty, const SDNode *CallNode) {
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if (Ty->isFP128Ty())
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return true;
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if (Ty->isStructTy() && Ty->getStructNumElements() == 1 &&
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Ty->getStructElementType(0)->isFP128Ty())
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return true;
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const ExternalSymbolSDNode *ES =
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dyn_cast_or_null<const ExternalSymbolSDNode>(CallNode);
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// If the Ty is i128 and the function being called is a long double emulation
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// routine, then the original type is f128.
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return (ES && Ty->isIntegerTy(128) && isF128SoftLibCall(ES->getSymbol()));
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}
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MipsCCState::SpecialCallingConvType
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MipsCCState::getSpecialCallingConvForCallee(const SDNode *Callee,
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const MipsSubtarget &Subtarget) {
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MipsCCState::SpecialCallingConvType SpecialCallingConv = NoSpecialCallingConv;
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if (Subtarget.inMips16HardFloat()) {
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if (const GlobalAddressSDNode *G =
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dyn_cast<const GlobalAddressSDNode>(Callee)) {
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llvm::StringRef Sym = G->getGlobal()->getName();
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Function *F = G->getGlobal()->getParent()->getFunction(Sym);
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if (F && F->hasFnAttribute("__Mips16RetHelper")) {
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SpecialCallingConv = Mips16RetHelperConv;
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}
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}
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}
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return SpecialCallingConv;
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}
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void MipsCCState::PreAnalyzeCallResultForF128(
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const SmallVectorImpl<ISD::InputArg> &Ins,
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const TargetLowering::CallLoweringInfo &CLI) {
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for (unsigned i = 0; i < Ins.size(); ++i) {
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OriginalArgWasF128.push_back(
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originalTypeIsF128(CLI.RetTy, CLI.Callee.getNode()));
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OriginalArgWasFloat.push_back(CLI.RetTy->isFloatingPointTy());
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}
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}
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/// Identify lowered values that originated from f128 arguments and record
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/// this for use by RetCC_MipsN.
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void MipsCCState::PreAnalyzeReturnForF128(
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const SmallVectorImpl<ISD::OutputArg> &Outs) {
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const MachineFunction &MF = getMachineFunction();
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for (unsigned i = 0; i < Outs.size(); ++i) {
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OriginalArgWasF128.push_back(
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originalTypeIsF128(MF.getFunction()->getReturnType(), nullptr));
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OriginalArgWasFloat.push_back(
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MF.getFunction()->getReturnType()->isFloatingPointTy());
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}
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}
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/// Identify lowered values that originated from f128 arguments and record
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/// this.
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void MipsCCState::PreAnalyzeCallOperands(
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const SmallVectorImpl<ISD::OutputArg> &Outs,
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std::vector<TargetLowering::ArgListEntry> &FuncArgs,
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const SDNode *CallNode) {
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for (unsigned i = 0; i < Outs.size(); ++i) {
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OriginalArgWasF128.push_back(
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originalTypeIsF128(FuncArgs[Outs[i].OrigArgIndex].Ty, CallNode));
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OriginalArgWasFloat.push_back(
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FuncArgs[Outs[i].OrigArgIndex].Ty->isFloatingPointTy());
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CallOperandIsFixed.push_back(Outs[i].IsFixed);
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}
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}
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/// Identify lowered values that originated from f128 arguments and record
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/// this.
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void MipsCCState::PreAnalyzeFormalArgumentsForF128(
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const SmallVectorImpl<ISD::InputArg> &Ins) {
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const MachineFunction &MF = getMachineFunction();
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for (unsigned i = 0; i < Ins.size(); ++i) {
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Function::const_arg_iterator FuncArg = MF.getFunction()->arg_begin();
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// SRet arguments cannot originate from f128 or {f128} returns so we just
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// push false. We have to handle this specially since SRet arguments
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// aren't mapped to an original argument.
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if (Ins[i].Flags.isSRet()) {
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OriginalArgWasF128.push_back(false);
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OriginalArgWasFloat.push_back(false);
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continue;
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}
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assert(Ins[i].getOrigArgIndex() < MF.getFunction()->arg_size());
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std::advance(FuncArg, Ins[i].getOrigArgIndex());
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OriginalArgWasF128.push_back(
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originalTypeIsF128(FuncArg->getType(), nullptr));
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OriginalArgWasFloat.push_back(FuncArg->getType()->isFloatingPointTy());
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}
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}
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