1 //===- MSP430.cpp ---------------------------------------------------------===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 9 #include "ABIInfoImpl.h" 10 #include "TargetInfo.h" 11 12 using namespace clang; 13 using namespace clang::CodeGen; 14 15 //===----------------------------------------------------------------------===// 16 // MSP430 ABI Implementation 17 //===----------------------------------------------------------------------===// 18 19 namespace { 20 21 class MSP430ABIInfo : public DefaultABIInfo { 22 static ABIArgInfo complexArgInfo() { 23 ABIArgInfo Info = ABIArgInfo::getDirect(); 24 Info.setCanBeFlattened(false); 25 return Info; 26 } 27 28 public: 29 MSP430ABIInfo(CodeGenTypes &CGT) : DefaultABIInfo(CGT) {} 30 31 ABIArgInfo classifyReturnType(QualType RetTy) const { 32 if (RetTy->isAnyComplexType()) 33 return complexArgInfo(); 34 35 return DefaultABIInfo::classifyReturnType(RetTy); 36 } 37 38 ABIArgInfo classifyArgumentType(QualType RetTy) const { 39 if (RetTy->isAnyComplexType()) 40 return complexArgInfo(); 41 42 return DefaultABIInfo::classifyArgumentType(RetTy); 43 } 44 45 // Just copy the original implementations because 46 // DefaultABIInfo::classify{Return,Argument}Type() are not virtual 47 void computeInfo(CGFunctionInfo &FI) const override { 48 if (!getCXXABI().classifyReturnType(FI)) 49 FI.getReturnInfo() = classifyReturnType(FI.getReturnType()); 50 for (auto &I : FI.arguments()) 51 I.info = classifyArgumentType(I.type); 52 } 53 54 Address EmitVAArg(CodeGenFunction &CGF, Address VAListAddr, 55 QualType Ty) const override { 56 return EmitVAArgInstr(CGF, VAListAddr, Ty, classifyArgumentType(Ty)); 57 } 58 }; 59 60 class MSP430TargetCodeGenInfo : public TargetCodeGenInfo { 61 public: 62 MSP430TargetCodeGenInfo(CodeGenTypes &CGT) 63 : TargetCodeGenInfo(std::make_unique<MSP430ABIInfo>(CGT)) {} 64 void setTargetAttributes(const Decl *D, llvm::GlobalValue *GV, 65 CodeGen::CodeGenModule &M) const override; 66 }; 67 68 } 69 70 void MSP430TargetCodeGenInfo::setTargetAttributes( 71 const Decl *D, llvm::GlobalValue *GV, CodeGen::CodeGenModule &M) const { 72 if (GV->isDeclaration()) 73 return; 74 if (const FunctionDecl *FD = dyn_cast_or_null<FunctionDecl>(D)) { 75 const auto *InterruptAttr = FD->getAttr<MSP430InterruptAttr>(); 76 if (!InterruptAttr) 77 return; 78 79 // Handle 'interrupt' attribute: 80 llvm::Function *F = cast<llvm::Function>(GV); 81 82 // Step 1: Set ISR calling convention. 83 F->setCallingConv(llvm::CallingConv::MSP430_INTR); 84 85 // Step 2: Add attributes goodness. 86 F->addFnAttr(llvm::Attribute::NoInline); 87 F->addFnAttr("interrupt", llvm::utostr(InterruptAttr->getNumber())); 88 } 89 } 90 91 std::unique_ptr<TargetCodeGenInfo> 92 CodeGen::createMSP430TargetCodeGenInfo(CodeGenModule &CGM) { 93 return std::make_unique<MSP430TargetCodeGenInfo>(CGM.getTypes()); 94 } 95