bd36f7331a
This change adds support for bitfields CIR records can now contain bit fields. I’ve updated the `CIRGenBitFieldInfo` comment, which originally came from the incubator and was identical to the one in OGCodeGen, to better reflect the current implementation. Support for bitfields in unions big-endian architectures and `get` and `set` operations remains unimplemented and will be addressed in a future patch.
73 lines
1.8 KiB
C++
73 lines
1.8 KiB
C++
#include "TargetInfo.h"
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#include "ABIInfo.h"
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using namespace clang;
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using namespace clang::CIRGen;
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bool clang::CIRGen::isEmptyRecordForLayout(const ASTContext &context,
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QualType t) {
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const RecordType *rt = t->getAs<RecordType>();
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if (!rt)
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return false;
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const RecordDecl *rd = rt->getDecl();
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// If this is a C++ record, check the bases first.
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if (const CXXRecordDecl *cxxrd = dyn_cast<CXXRecordDecl>(rd)) {
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if (cxxrd->isDynamicClass())
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return false;
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for (const auto &I : cxxrd->bases())
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if (!isEmptyRecordForLayout(context, I.getType()))
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return false;
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}
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for (const auto *I : rd->fields())
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if (!isEmptyFieldForLayout(context, I))
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return false;
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return true;
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}
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bool clang::CIRGen::isEmptyFieldForLayout(const ASTContext &context,
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const FieldDecl *fd) {
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if (fd->isZeroLengthBitField())
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return true;
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if (fd->isUnnamedBitField())
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return false;
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return isEmptyRecordForLayout(context, fd->getType());
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}
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namespace {
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class X8664ABIInfo : public ABIInfo {
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public:
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X8664ABIInfo(CIRGenTypes &cgt) : ABIInfo(cgt) {}
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};
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class X8664TargetCIRGenInfo : public TargetCIRGenInfo {
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public:
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X8664TargetCIRGenInfo(CIRGenTypes &cgt)
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: TargetCIRGenInfo(std::make_unique<X8664ABIInfo>(cgt)) {}
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};
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} // namespace
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std::unique_ptr<TargetCIRGenInfo>
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clang::CIRGen::createX8664TargetCIRGenInfo(CIRGenTypes &cgt) {
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return std::make_unique<X8664TargetCIRGenInfo>(cgt);
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}
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ABIInfo::~ABIInfo() noexcept = default;
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bool TargetCIRGenInfo::isNoProtoCallVariadic(
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const FunctionNoProtoType *fnType) const {
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// The following conventions are known to require this to be false:
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// x86_stdcall
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// MIPS
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// For everything else, we just prefer false unless we opt out.
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return false;
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}
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