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+//===----- 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.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef CLANG_CODEGEN_CGCALL_H
+#define CLANG_CODEGEN_CGCALL_H
+
+#include "llvm/ADT/FoldingSet.h"
+#include "llvm/Value.h"
+#include "clang/AST/Type.h"
+#include "clang/AST/CanonicalType.h"
+
+#include "CGValue.h"
+
+// FIXME: Restructure so we don't have to expose so much stuff.
+#include "ABIInfo.h"
+
+namespace llvm {
+ struct AttributeWithIndex;
+ class Function;
+ class Type;
+ class Value;
+
+ template<typename T, unsigned> class SmallVector;
+}
+
+namespace clang {
+ class ASTContext;
+ class Decl;
+ class FunctionDecl;
+ class ObjCMethodDecl;
+ class VarDecl;
+
+namespace CodeGen {
+ typedef SmallVector<llvm::AttributeWithIndex, 8> AttributeListType;
+
+ struct CallArg {
+ RValue RV;
+ QualType Ty;
+ bool NeedsCopy;
+ CallArg(RValue rv, QualType ty, bool needscopy)
+ : RV(rv), Ty(ty), NeedsCopy(needscopy)
+ { }
+ };
+
+ /// CallArgList - Type for representing both the value and type of
+ /// arguments in a call.
+ class CallArgList :
+ public SmallVector<CallArg, 16> {
+ public:
+ struct Writeback {
+ /// The original argument.
+ llvm::Value *Address;
+
+ /// The pointee type of the original argument.
+ QualType AddressType;
+
+ /// The temporary alloca.
+ llvm::Value *Temporary;
+ };
+
+ void add(RValue rvalue, QualType type, bool needscopy = false) {
+ push_back(CallArg(rvalue, type, needscopy));
+ }
+
+ void addFrom(const CallArgList &other) {
+ insert(end(), other.begin(), other.end());
+ Writebacks.insert(Writebacks.end(),
+ other.Writebacks.begin(), other.Writebacks.end());
+ }
+
+ void addWriteback(llvm::Value *address, QualType addressType,
+ llvm::Value *temporary) {
+ Writeback writeback;
+ writeback.Address = address;
+ writeback.AddressType = addressType;
+ writeback.Temporary = temporary;
+ Writebacks.push_back(writeback);
+ }
+
+ bool hasWritebacks() const { return !Writebacks.empty(); }
+
+ typedef SmallVectorImpl<Writeback>::const_iterator writeback_iterator;
+ writeback_iterator writeback_begin() const { return Writebacks.begin(); }
+ writeback_iterator writeback_end() const { return Writebacks.end(); }
+
+ private:
+ SmallVector<Writeback, 1> Writebacks;
+ };
+
+ /// FunctionArgList - Type for representing both the decl and type
+ /// of parameters to a function. The decl must be either a
+ /// ParmVarDecl or ImplicitParamDecl.
+ class FunctionArgList : public SmallVector<const VarDecl*, 16> {
+ };
+
+ /// CGFunctionInfo - Class to encapsulate the information about a
+ /// function definition.
+ class CGFunctionInfo : public llvm::FoldingSetNode {
+ struct ArgInfo {
+ CanQualType type;
+ ABIArgInfo info;
+ };
+
+ /// The LLVM::CallingConv to use for this function (as specified by the
+ /// user).
+ unsigned CallingConvention;
+
+ /// The LLVM::CallingConv to actually use for this function, which may
+ /// depend on the ABI.
+ unsigned EffectiveCallingConvention;
+
+ /// Whether this function is noreturn.
+ bool NoReturn;
+
+ /// Whether this function is returns-retained.
+ bool ReturnsRetained;
+
+ unsigned NumArgs;
+ ArgInfo *Args;
+
+ /// How many arguments to pass inreg.
+ bool HasRegParm;
+ unsigned RegParm;
+
+ public:
+ typedef const ArgInfo *const_arg_iterator;
+ typedef ArgInfo *arg_iterator;
+
+ CGFunctionInfo(unsigned CallingConvention, bool NoReturn,
+ bool ReturnsRetained, bool HasRegParm, unsigned RegParm,
+ CanQualType ResTy,
+ const CanQualType *ArgTys, unsigned NumArgTys);
+ ~CGFunctionInfo() { delete[] Args; }
+
+ const_arg_iterator arg_begin() const { return Args + 1; }
+ const_arg_iterator arg_end() const { return Args + 1 + NumArgs; }
+ arg_iterator arg_begin() { return Args + 1; }
+ arg_iterator arg_end() { return Args + 1 + NumArgs; }
+
+ unsigned arg_size() const { return NumArgs; }
+
+ bool isNoReturn() const { return NoReturn; }
+
+ /// In ARR, whether this function retains its return value. This
+ /// is not always reliable for call sites.
+ bool isReturnsRetained() const { return ReturnsRetained; }
+
+ /// getCallingConvention - Return the user specified calling
+ /// convention.
+ unsigned getCallingConvention() const { return CallingConvention; }
+
+ /// getEffectiveCallingConvention - Return the actual calling convention to
+ /// use, which may depend on the ABI.
+ unsigned getEffectiveCallingConvention() const {
+ return EffectiveCallingConvention;
+ }
+ void setEffectiveCallingConvention(unsigned Value) {
+ EffectiveCallingConvention = Value;
+ }
+
+ bool getHasRegParm() const { return HasRegParm; }
+ unsigned getRegParm() const { return RegParm; }
+
+ CanQualType getReturnType() const { return Args[0].type; }
+
+ ABIArgInfo &getReturnInfo() { return Args[0].info; }
+ const ABIArgInfo &getReturnInfo() const { return Args[0].info; }
+
+ void Profile(llvm::FoldingSetNodeID &ID) {
+ ID.AddInteger(getCallingConvention());
+ ID.AddBoolean(NoReturn);
+ ID.AddBoolean(ReturnsRetained);
+ ID.AddBoolean(HasRegParm);
+ ID.AddInteger(RegParm);
+ getReturnType().Profile(ID);
+ for (arg_iterator it = arg_begin(), ie = arg_end(); it != ie; ++it)
+ it->type.Profile(ID);
+ }
+ template<class Iterator>
+ static void Profile(llvm::FoldingSetNodeID &ID,
+ const FunctionType::ExtInfo &Info,
+ CanQualType ResTy,
+ Iterator begin,
+ Iterator end) {
+ ID.AddInteger(Info.getCC());
+ ID.AddBoolean(Info.getNoReturn());
+ ID.AddBoolean(Info.getProducesResult());
+ ID.AddBoolean(Info.getHasRegParm());
+ ID.AddInteger(Info.getRegParm());
+ ResTy.Profile(ID);
+ for (; begin != end; ++begin) {
+ CanQualType T = *begin; // force iterator to be over canonical types
+ T.Profile(ID);
+ }
+ }
+ };
+
+ /// ReturnValueSlot - Contains the address where the return value of a
+ /// function can be stored, and whether the address is volatile or not.
+ class ReturnValueSlot {
+ llvm::PointerIntPair<llvm::Value *, 1, bool> Value;
+
+ public:
+ ReturnValueSlot() {}
+ ReturnValueSlot(llvm::Value *Value, bool IsVolatile)
+ : Value(Value, IsVolatile) {}
+
+ bool isNull() const { return !getValue(); }
+
+ bool isVolatile() const { return Value.getInt(); }
+ llvm::Value *getValue() const { return Value.getPointer(); }
+ };
+
+} // end namespace CodeGen
+} // end namespace clang
+
+#endif
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