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c297159d2f
We still don't really have an equivalent of "AssertXExt" in DAG, so we don't exploit the guarantees on the receiving side yet, but this should produce conservatively correct code on iOS ABIs. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@282069 91177308-0d34-0410-b5e6-96231b3b80d8
103 lines
3.9 KiB
C++
103 lines
3.9 KiB
C++
//===-- lib/CodeGen/GlobalISel/CallLowering.cpp - Call lowering -----------===//
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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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///
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/// \file
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/// This file implements some simple delegations needed for call lowering.
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///
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//===----------------------------------------------------------------------===//
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#include "llvm/CodeGen/GlobalISel/CallLowering.h"
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#include "llvm/CodeGen/MachineOperand.h"
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#include "llvm/IR/Instructions.h"
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#include "llvm/IR/DataLayout.h"
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#include "llvm/IR/Module.h"
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#include "llvm/Target/TargetLowering.h"
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using namespace llvm;
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bool CallLowering::lowerCall(
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MachineIRBuilder &MIRBuilder, const CallInst &CI, unsigned ResReg,
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ArrayRef<unsigned> ArgRegs, std::function<unsigned()> GetCalleeReg) const {
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auto &DL = CI.getParent()->getParent()->getParent()->getDataLayout();
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// First step is to marshall all the function's parameters into the correct
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// physregs and memory locations. Gather the sequence of argument types that
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// we'll pass to the assigner function.
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SmallVector<ArgInfo, 8> OrigArgs;
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unsigned i = 0;
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for (auto &Arg : CI.arg_operands()) {
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ArgInfo OrigArg{ArgRegs[i], Arg->getType(), ISD::ArgFlagsTy{}};
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setArgFlags(OrigArg, i + 1, DL, CI);
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OrigArgs.push_back(OrigArg);
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++i;
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}
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MachineOperand Callee = MachineOperand::CreateImm(0);
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if (Function *F = CI.getCalledFunction())
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Callee = MachineOperand::CreateGA(F, 0);
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else
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Callee = MachineOperand::CreateReg(GetCalleeReg(), false);
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ArgInfo OrigRet{ResReg, CI.getType(), ISD::ArgFlagsTy{}};
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if (!OrigRet.Ty->isVoidTy())
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setArgFlags(OrigRet, AttributeSet::ReturnIndex, DL, CI);
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return lowerCall(MIRBuilder, Callee, OrigRet, OrigArgs);
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}
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template <typename FuncInfoTy>
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void CallLowering::setArgFlags(CallLowering::ArgInfo &Arg, unsigned OpIdx,
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const DataLayout &DL,
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const FuncInfoTy &FuncInfo) const {
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const AttributeSet &Attrs = FuncInfo.getAttributes();
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if (Attrs.hasAttribute(OpIdx, Attribute::ZExt))
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Arg.Flags.setZExt();
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if (Attrs.hasAttribute(OpIdx, Attribute::SExt))
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Arg.Flags.setSExt();
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if (Attrs.hasAttribute(OpIdx, Attribute::InReg))
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Arg.Flags.setInReg();
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if (Attrs.hasAttribute(OpIdx, Attribute::StructRet))
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Arg.Flags.setSRet();
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if (Attrs.hasAttribute(OpIdx, Attribute::SwiftSelf))
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Arg.Flags.setSwiftSelf();
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if (Attrs.hasAttribute(OpIdx, Attribute::SwiftError))
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Arg.Flags.setSwiftError();
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if (Attrs.hasAttribute(OpIdx, Attribute::ByVal))
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Arg.Flags.setByVal();
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if (Attrs.hasAttribute(OpIdx, Attribute::InAlloca))
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Arg.Flags.setInAlloca();
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if (Arg.Flags.isByVal() || Arg.Flags.isInAlloca()) {
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Type *ElementTy = cast<PointerType>(Arg.Ty)->getElementType();
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Arg.Flags.setByValSize(DL.getTypeAllocSize(ElementTy));
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// For ByVal, alignment should be passed from FE. BE will guess if
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// this info is not there but there are cases it cannot get right.
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unsigned FrameAlign;
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if (FuncInfo.getParamAlignment(OpIdx))
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FrameAlign = FuncInfo.getParamAlignment(OpIdx);
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else
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FrameAlign = getTLI()->getByValTypeAlignment(ElementTy, DL);
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Arg.Flags.setByValAlign(FrameAlign);
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}
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if (Attrs.hasAttribute(OpIdx, Attribute::Nest))
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Arg.Flags.setNest();
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Arg.Flags.setOrigAlign(DL.getABITypeAlignment(Arg.Ty));
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}
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template void
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CallLowering::setArgFlags<Function>(CallLowering::ArgInfo &Arg, unsigned OpIdx,
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const DataLayout &DL,
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const Function &FuncInfo) const;
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template void
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CallLowering::setArgFlags<CallInst>(CallLowering::ArgInfo &Arg, unsigned OpIdx,
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const DataLayout &DL,
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const CallInst &FuncInfo) const;
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