WebAssembly.cpp

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//===- WebAssembly.cpp ----------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
 
#include "ABIInfoImpl.h"
#include "TargetInfo.h"
 
using namespace clang;
using namespace clang::CodeGen;
 
//===----------------------------------------------------------------------===//
// WebAssembly ABI Implementation
//
// This is a very simple ABI that relies a lot on DefaultABIInfo.
//===----------------------------------------------------------------------===//
 
class WebAssemblyABIInfo final : public ABIInfo {
  DefaultABIInfo defaultInfo;
  WebAssemblyABIKind Kind;
 
public:
  explicit WebAssemblyABIInfo(CodeGen::CodeGenTypes &CGT,
                              WebAssemblyABIKind Kind)
      : ABIInfo(CGT), defaultInfo(CGT), Kind(Kind) {}
 
private:
  ABIArgInfo classifyReturnType(QualType RetTy) const;
  ABIArgInfo classifyArgumentType(QualType Ty) const;
 
  // DefaultABIInfo's classifyReturnType and classifyArgumentType are
  // non-virtual, but computeInfo and EmitVAArg are virtual, so we
  // overload them.
  void computeInfo(CGFunctionInfo &FI) const override {
    if (!getCXXABI().classifyReturnType(FI))
      FI.getReturnInfo() = classifyReturnType(FI.getReturnType());
    for (auto &Arg : FI.arguments())
      Arg.info = classifyArgumentType(Arg.type);
  }
 
  RValue EmitVAArg(CodeGenFunction &CGF, Address VAListAddr, QualType Ty,
                   AggValueSlot Slot) const override;
};
 
class WebAssemblyTargetCodeGenInfo final : public TargetCodeGenInfo {
public:
  explicit