95 lines
3 KiB
C++
95 lines
3 KiB
C++
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//===- MSP430.cpp ---------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "ABIInfoImpl.h"
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#include "TargetInfo.h"
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using namespace clang;
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using namespace clang::CodeGen;
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//===----------------------------------------------------------------------===//
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// MSP430 ABI Implementation
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//===----------------------------------------------------------------------===//
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namespace {
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class MSP430ABIInfo : public DefaultABIInfo {
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static ABIArgInfo complexArgInfo() {
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ABIArgInfo Info = ABIArgInfo::getDirect();
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Info.setCanBeFlattened(false);
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return Info;
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}
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public:
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MSP430ABIInfo(CodeGenTypes &CGT) : DefaultABIInfo(CGT) {}
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ABIArgInfo classifyReturnType(QualType RetTy) const {
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if (RetTy->isAnyComplexType())
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return complexArgInfo();
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return DefaultABIInfo::classifyReturnType(RetTy);
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}
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ABIArgInfo classifyArgumentType(QualType RetTy) const {
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if (RetTy->isAnyComplexType())
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return complexArgInfo();
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return DefaultABIInfo::classifyArgumentType(RetTy);
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}
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// Just copy the original implementations because
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// DefaultABIInfo::classify{Return,Argument}Type() are not virtual
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void computeInfo(CGFunctionInfo &FI) const override {
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if (!getCXXABI().classifyReturnType(FI))
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FI.getReturnInfo() = classifyReturnType(FI.getReturnType());
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for (auto &I : FI.arguments())
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I.info = classifyArgumentType(I.type);
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}
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Address EmitVAArg(CodeGenFunction &CGF, Address VAListAddr,
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QualType Ty) const override {
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return EmitVAArgInstr(CGF, VAListAddr, Ty, classifyArgumentType(Ty));
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}
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};
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class MSP430TargetCodeGenInfo : public TargetCodeGenInfo {
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public:
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MSP430TargetCodeGenInfo(CodeGenTypes &CGT)
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: TargetCodeGenInfo(std::make_unique<MSP430ABIInfo>(CGT)) {}
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void setTargetAttributes(const Decl *D, llvm::GlobalValue *GV,
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CodeGen::CodeGenModule &M) const override;
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};
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}
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void MSP430TargetCodeGenInfo::setTargetAttributes(
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const Decl *D, llvm::GlobalValue *GV, CodeGen::CodeGenModule &M) const {
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if (GV->isDeclaration())
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return;
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if (const FunctionDecl *FD = dyn_cast_or_null<FunctionDecl>(D)) {
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const auto *InterruptAttr = FD->getAttr<MSP430InterruptAttr>();
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if (!InterruptAttr)
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return;
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// Handle 'interrupt' attribute:
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llvm::Function *F = cast<llvm::Function>(GV);
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// Step 1: Set ISR calling convention.
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F->setCallingConv(llvm::CallingConv::MSP430_INTR);
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// Step 2: Add attributes goodness.
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F->addFnAttr(llvm::Attribute::NoInline);
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F->addFnAttr("interrupt", llvm::utostr(InterruptAttr->getNumber()));
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}
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}
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std::unique_ptr<TargetCodeGenInfo>
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CodeGen::createMSP430TargetCodeGenInfo(CodeGenModule &CGM) {
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return std::make_unique<MSP430TargetCodeGenInfo>(CGM.getTypes());
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}
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