1 //===----- CGCall.h - Encapsulate calling convention details ----*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // These classes wrap the information about a call or function
11 // definition used to handle ABI compliancy.
13 //===----------------------------------------------------------------------===//
15 #ifndef CLANG_CODEGEN_CGCALL_H
16 #define CLANG_CODEGEN_CGCALL_H
18 #include "llvm/ADT/FoldingSet.h"
19 #include "llvm/Value.h"
20 #include "clang/AST/Type.h"
21 #include "clang/AST/CanonicalType.h"
25 // FIXME: Restructure so we don't have to expose so much stuff.
29 struct AttributeWithIndex;
34 template<typename T, unsigned> class SmallVector;
45 typedef llvm::SmallVector<llvm::AttributeWithIndex, 8> AttributeListType;
51 CallArg(RValue rv, QualType ty, bool needscopy)
52 : RV(rv), Ty(ty), NeedsCopy(needscopy)
56 /// CallArgList - Type for representing both the value and type of
57 /// arguments in a call.
59 public llvm::SmallVector<CallArg, 16> {
61 void add(RValue rvalue, QualType type, bool needscopy = false) {
62 push_back(CallArg(rvalue, type, needscopy));
66 /// FunctionArgList - Type for representing both the decl and type
67 /// of parameters to a function. The decl must be either a
68 /// ParmVarDecl or ImplicitParamDecl.
69 class FunctionArgList : public llvm::SmallVector<const VarDecl*, 16> {
72 /// CGFunctionInfo - Class to encapsulate the information about a
73 /// function definition.
74 class CGFunctionInfo : public llvm::FoldingSetNode {
80 /// The LLVM::CallingConv to use for this function (as specified by the
82 unsigned CallingConvention;
84 /// The LLVM::CallingConv to actually use for this function, which may
85 /// depend on the ABI.
86 unsigned EffectiveCallingConvention;
88 /// Whether this function is noreturn.
94 /// How many arguments to pass inreg.
99 typedef const ArgInfo *const_arg_iterator;
100 typedef ArgInfo *arg_iterator;
102 CGFunctionInfo(unsigned CallingConvention, bool NoReturn,
103 bool HasRegParm, unsigned RegParm, CanQualType ResTy,
104 const CanQualType *ArgTys, unsigned NumArgTys);
105 ~CGFunctionInfo() { delete[] Args; }
107 const_arg_iterator arg_begin() const { return Args + 1; }
108 const_arg_iterator arg_end() const { return Args + 1 + NumArgs; }
109 arg_iterator arg_begin() { return Args + 1; }
110 arg_iterator arg_end() { return Args + 1 + NumArgs; }
112 unsigned arg_size() const { return NumArgs; }
114 bool isNoReturn() const { return NoReturn; }
116 /// getCallingConvention - Return the user specified calling
118 unsigned getCallingConvention() const { return CallingConvention; }
120 /// getEffectiveCallingConvention - Return the actual calling convention to
121 /// use, which may depend on the ABI.
122 unsigned getEffectiveCallingConvention() const {
123 return EffectiveCallingConvention;
125 void setEffectiveCallingConvention(unsigned Value) {
126 EffectiveCallingConvention = Value;
129 bool getHasRegParm() const { return HasRegParm; }
130 unsigned getRegParm() const { return RegParm; }
132 CanQualType getReturnType() const { return Args[0].type; }
134 ABIArgInfo &getReturnInfo() { return Args[0].info; }
135 const ABIArgInfo &getReturnInfo() const { return Args[0].info; }
137 void Profile(llvm::FoldingSetNodeID &ID) {
138 ID.AddInteger(getCallingConvention());
139 ID.AddBoolean(NoReturn);
140 ID.AddBoolean(HasRegParm);
141 ID.AddInteger(RegParm);
142 getReturnType().Profile(ID);
143 for (arg_iterator it = arg_begin(), ie = arg_end(); it != ie; ++it)
144 it->type.Profile(ID);
146 template<class Iterator>
147 static void Profile(llvm::FoldingSetNodeID &ID,
148 const FunctionType::ExtInfo &Info,
152 ID.AddInteger(Info.getCC());
153 ID.AddBoolean(Info.getNoReturn());
154 ID.AddBoolean(Info.getHasRegParm());
155 ID.AddInteger(Info.getRegParm());
157 for (; begin != end; ++begin) {
158 CanQualType T = *begin; // force iterator to be over canonical types
164 /// ReturnValueSlot - Contains the address where the return value of a
165 /// function can be stored, and whether the address is volatile or not.
166 class ReturnValueSlot {
167 llvm::PointerIntPair<llvm::Value *, 1, bool> Value;
171 ReturnValueSlot(llvm::Value *Value, bool IsVolatile)
172 : Value(Value, IsVolatile) {}
174 bool isNull() const { return !getValue(); }
176 bool isVolatile() const { return Value.getInt(); }
177 llvm::Value *getValue() const { return Value.getPointer(); }
180 } // end namespace CodeGen
181 } // end namespace clang