Refactor parameter attribute handling:
- Add CGCall.h for dealing with ABI issues related to calls.
- Add CGFunctionInfo and CGCallInfo for capturing ABI relevant
information about functions and calls.
- Isolate LLVM parameter attribute handling inside CGCall.cpp
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@55963 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/CGCall.cpp b/lib/CodeGen/CGCall.cpp
new file mode 100644
index 0000000..d342ef0
--- /dev/null
+++ b/lib/CodeGen/CGCall.cpp
@@ -0,0 +1,117 @@
+//===----- CGCall.h - Encapsulate calling convention details ----*- C++ -*-===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// These classes wrap the information about a call or function
+// definition used to handle ABI compliancy.
+//
+//===----------------------------------------------------------------------===//
+
+#include "CGCall.h"
+#include "CodeGenFunction.h"
+#include "clang/AST/ASTContext.h"
+#include "clang/AST/Decl.h"
+#include "clang/AST/DeclObjC.h"
+#include "llvm/ParameterAttributes.h"
+using namespace clang;
+using namespace CodeGen;
+
+/***/
+
+static void
+constructParamAttrListInternal(const Decl *TargetDecl,
+ const llvm::SmallVector<QualType, 16> &ArgTypes,
+ ParamAttrListType &PAL) {
+ unsigned FuncAttrs = 0;
+
+ if (TargetDecl) {
+ if (TargetDecl->getAttr<NoThrowAttr>())
+ FuncAttrs |= llvm::ParamAttr::NoUnwind;
+ if (TargetDecl->getAttr<NoReturnAttr>())
+ FuncAttrs |= llvm::ParamAttr::NoReturn;
+ }
+
+ unsigned Index = 1;
+ if (CodeGenFunction::hasAggregateLLVMType(ArgTypes[0])) {
+ PAL.push_back(llvm::ParamAttrsWithIndex::get(Index,
+ llvm::ParamAttr::StructRet));
+ ++Index;
+ } else if (ArgTypes[0]->isPromotableIntegerType()) {
+ if (ArgTypes[0]->isSignedIntegerType()) {
+ FuncAttrs |= llvm::ParamAttr::SExt;
+ } else if (ArgTypes[0]->isUnsignedIntegerType()) {
+ FuncAttrs |= llvm::ParamAttr::ZExt;
+ }
+ }
+ if (FuncAttrs)
+ PAL.push_back(llvm::ParamAttrsWithIndex::get(0, FuncAttrs));
+ for (llvm::SmallVector<QualType, 8>::const_iterator i = ArgTypes.begin() + 1,
+ e = ArgTypes.end(); i != e; ++i, ++Index) {
+ QualType ParamType = *i;
+ unsigned ParamAttrs = 0;
+ if (ParamType->isRecordType())
+ ParamAttrs |= llvm::ParamAttr::ByVal;
+ if (ParamType->isPromotableIntegerType()) {
+ if (ParamType->isSignedIntegerType()) {
+ ParamAttrs |= llvm::ParamAttr::SExt;
+ } else if (ParamType->isUnsignedIntegerType()) {
+ ParamAttrs |= llvm::ParamAttr::ZExt;
+ }
+ }
+ if (ParamAttrs)
+ PAL.push_back(llvm::ParamAttrsWithIndex::get(Index, ParamAttrs));
+ }
+}
+
+/***/
+
+// FIXME: Use iterator and sidestep silly type array creation.
+
+CGFunctionInfo::CGFunctionInfo(const FunctionDecl *FD)
+ : TheDecl(FD)
+{
+ const FunctionType *FTy = FD->getType()->getAsFunctionType();
+ const FunctionTypeProto *FTP = dyn_cast<FunctionTypeProto>(FTy);
+
+ ArgTypes.push_back(FTy->getResultType());
+ if (FTP)
+ for (unsigned i = 0, e = FTP->getNumArgs(); i != e; ++i)
+ ArgTypes.push_back(FTP->getArgType(i));
+}
+
+CGFunctionInfo::CGFunctionInfo(const ObjCMethodDecl *MD,
+ const ASTContext &Context)
+ : TheDecl(MD)
+{
+ ArgTypes.push_back(MD->getResultType());
+ ArgTypes.push_back(MD->getSelfDecl()->getType());
+ ArgTypes.push_back(Context.getObjCSelType());
+ for (ObjCMethodDecl::param_const_iterator i = MD->param_begin(),
+ e = MD->param_end(); i != e; ++i)
+ ArgTypes.push_back((*i)->getType());
+}
+
+void CGFunctionInfo::constructParamAttrList(ParamAttrListType &PAL) const {
+ constructParamAttrListInternal(TheDecl, ArgTypes, PAL);
+}
+
+/***/
+
+CGCallInfo::CGCallInfo(QualType _ResultType,
+ const llvm::SmallVector<std::pair<llvm::Value*, QualType>, 16> &_Args)
+ : ResultType(_ResultType),
+ Args(_Args) {
+ ArgTypes.push_back(ResultType);
+ for (CallArgList::const_iterator i = Args.begin(), e = Args.end(); i!=e; ++i)
+ ArgTypes.push_back(i->second);
+}
+
+void CGCallInfo::constructParamAttrList(ParamAttrListType &PAL) const {
+ // FIXME: Provide TargetDecl so nounwind, noreturn, etc, etc get set.
+ constructParamAttrListInternal(0, ArgTypes, PAL);
+}