| 1 | #include "TargetInfo.h" |
|---|---|
| 2 | #include "ABIInfo.h" |
| 3 | |
| 4 | using namespace clang; |
| 5 | using namespace clang::CIRGen; |
| 6 | |
| 7 | bool clang::CIRGen::isEmptyRecordForLayout(const ASTContext &context, |
| 8 | QualType t) { |
| 9 | const RecordType *rt = t->getAs<RecordType>(); |
| 10 | if (!rt) |
| 11 | return false; |
| 12 | |
| 13 | const RecordDecl *rd = rt->getDecl(); |
| 14 | |
| 15 | // If this is a C++ record, check the bases first. |
| 16 | if (const CXXRecordDecl *cxxrd = dyn_cast<CXXRecordDecl>(Val: rd)) { |
| 17 | if (cxxrd->isDynamicClass()) |
| 18 | return false; |
| 19 | |
| 20 | for (const auto &I : cxxrd->bases()) |
| 21 | if (!isEmptyRecordForLayout(context, t: I.getType())) |
| 22 | return false; |
| 23 | } |
| 24 | |
| 25 | for (const auto *I : rd->fields()) |
| 26 | if (!isEmptyFieldForLayout(context, fd: I)) |
| 27 | return false; |
| 28 | |
| 29 | return true; |
| 30 | } |
| 31 | |
| 32 | bool clang::CIRGen::isEmptyFieldForLayout(const ASTContext &context, |
| 33 | const FieldDecl *fd) { |
| 34 | if (fd->isZeroLengthBitField()) |
| 35 | return true; |
| 36 | |
| 37 | if (fd->isUnnamedBitField()) |
| 38 | return false; |
| 39 | |
| 40 | return isEmptyRecordForLayout(context, t: fd->getType()); |
| 41 | } |
| 42 | |
| 43 | namespace { |
| 44 | |
| 45 | class X8664ABIInfo : public ABIInfo { |
| 46 | public: |
| 47 | X8664ABIInfo(CIRGenTypes &cgt) : ABIInfo(cgt) {} |
| 48 | }; |
| 49 | |
| 50 | class X8664TargetCIRGenInfo : public TargetCIRGenInfo { |
| 51 | public: |
| 52 | X8664TargetCIRGenInfo(CIRGenTypes &cgt) |
| 53 | : TargetCIRGenInfo(std::make_unique<X8664ABIInfo>(args&: cgt)) {} |
| 54 | }; |
| 55 | |
| 56 | } // namespace |
| 57 | |
| 58 | std::unique_ptr<TargetCIRGenInfo> |
| 59 | clang::CIRGen::createX8664TargetCIRGenInfo(CIRGenTypes &cgt) { |
| 60 | return std::make_unique<X8664TargetCIRGenInfo>(args&: cgt); |
| 61 | } |
| 62 | |
| 63 | ABIInfo::~ABIInfo() noexcept = default; |
| 64 | |
| 65 | bool TargetCIRGenInfo::isNoProtoCallVariadic( |
| 66 | const FunctionNoProtoType *fnType) const { |
| 67 | // The following conventions are known to require this to be false: |
| 68 | // x86_stdcall |
| 69 | // MIPS |
| 70 | // For everything else, we just prefer false unless we opt out. |
| 71 | return false; |
| 72 | } |
| 73 |