| 1 | //===----------------------------------------------------------------------===// |
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| 2 | // |
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| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | // See https://llvm.org/LICENSE.txt for license information. |
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| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | // |
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| 7 | //===----------------------------------------------------------------------===// |
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| 8 | // |
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| 9 | // This provides an abstract class for C++ code generation. Concrete subclasses |
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| 10 | // of this implement code generation for specific C++ ABIs. |
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| 11 | // |
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| 12 | //===----------------------------------------------------------------------===// |
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| 13 | |
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| 14 | #include "CIRGenCXXABI.h" |
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| 15 | #include "CIRGenFunction.h" |
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| 16 | |
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| 17 | #include "clang/AST/Decl.h" |
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| 18 | #include "clang/AST/GlobalDecl.h" |
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| 19 | |
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| 20 | using namespace clang; |
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| 21 | using namespace clang::CIRGen; |
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| 22 | |
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| 23 | CIRGenCXXABI::~CIRGenCXXABI() {} |
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| 24 | |
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| 25 | void CIRGenCXXABI::buildThisParam(CIRGenFunction &cgf, |
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| 26 | FunctionArgList ¶ms) { |
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| 27 | const auto *md = cast<CXXMethodDecl>(Val: cgf.curGD.getDecl()); |
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| 28 | |
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| 29 | // FIXME: I'm not entirely sure I like using a fake decl just for code |
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| 30 | // generation. Maybe we can come up with a better way? |
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| 31 | auto *thisDecl = |
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| 32 | ImplicitParamDecl::Create(cgm.getASTContext(), nullptr, md->getLocation(), |
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| 33 | &cgm.getASTContext().Idents.get(Name: "this" ), |
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| 34 | md->getThisType(), ImplicitParamKind::CXXThis); |
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| 35 | params.push_back(Elt: thisDecl); |
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| 36 | cgf.cxxabiThisDecl = thisDecl; |
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| 37 | |
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| 38 | // Classic codegen computes the alignment of thisDecl and saves it in |
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| 39 | // CodeGenFunction::CXXABIThisAlignment, but it is only used in emitTypeCheck |
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| 40 | // in CodeGenFunction::StartFunction(). |
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| 41 | assert(!cir::MissingFeatures::cxxabiThisAlignment()); |
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| 42 | } |
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| 43 | |
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| 44 | mlir::Value CIRGenCXXABI::loadIncomingCXXThis(CIRGenFunction &cgf) { |
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| 45 | ImplicitParamDecl *vd = getThisDecl(cgf); |
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| 46 | Address addr = cgf.getAddrOfLocalVar(vd); |
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| 47 | return cgf.getBuilder().create<cir::LoadOp>( |
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| 48 | cgf.getLoc(vd->getLocation()), addr.getElementType(), addr.getPointer()); |
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| 49 | } |
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| 50 | |
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| 51 | void CIRGenCXXABI::setCXXABIThisValue(CIRGenFunction &cgf, |
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| 52 | mlir::Value thisPtr) { |
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| 53 | /// Initialize the 'this' slot. |
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| 54 | assert(getThisDecl(cgf) && "no 'this' variable for function" ); |
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| 55 | cgf.cxxabiThisValue = thisPtr; |
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| 56 | } |
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| 57 | |
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