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 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 SmallVector<CallArg, 16> {
62 /// The original argument.
65 /// The pointee type of the original argument.
68 /// The temporary alloca.
69 llvm::Value *Temporary;
72 void add(RValue rvalue, QualType type, bool needscopy = false) {
73 push_back(CallArg(rvalue, type, needscopy));
76 void addFrom(const CallArgList &other) {
77 insert(end(), other.begin(), other.end());
78 Writebacks.insert(Writebacks.end(),
79 other.Writebacks.begin(), other.Writebacks.end());
82 void addWriteback(llvm::Value *address, QualType addressType,
83 llvm::Value *temporary) {
85 writeback.Address = address;
86 writeback.AddressType = addressType;
87 writeback.Temporary = temporary;
88 Writebacks.push_back(writeback);
91 bool hasWritebacks() const { return !Writebacks.empty(); }
93 typedef SmallVectorImpl<Writeback>::const_iterator writeback_iterator;
94 writeback_iterator writeback_begin() const { return Writebacks.begin(); }
95 writeback_iterator writeback_end() const { return Writebacks.end(); }
98 SmallVector<Writeback, 1> Writebacks;
101 /// FunctionArgList - Type for representing both the decl and type
102 /// of parameters to a function. The decl must be either a
103 /// ParmVarDecl or ImplicitParamDecl.
104 class FunctionArgList : public SmallVector<const VarDecl*, 16> {
107 /// CGFunctionInfo - Class to encapsulate the information about a
108 /// function definition.
109 class CGFunctionInfo : public llvm::FoldingSetNode {
115 /// The LLVM::CallingConv to use for this function (as specified by the
117 unsigned CallingConvention;
119 /// The LLVM::CallingConv to actually use for this function, which may
120 /// depend on the ABI.
121 unsigned EffectiveCallingConvention;
123 /// Whether this function is noreturn.
126 /// Whether this function is returns-retained.
127 bool ReturnsRetained;
132 /// How many arguments to pass inreg.
137 typedef const ArgInfo *const_arg_iterator;
138 typedef ArgInfo *arg_iterator;
140 CGFunctionInfo(unsigned CallingConvention, bool NoReturn,
141 bool ReturnsRetained, bool HasRegParm, unsigned RegParm,
143 const CanQualType *ArgTys, unsigned NumArgTys);
144 ~CGFunctionInfo() { delete[] Args; }
146 const_arg_iterator arg_begin() const { return Args + 1; }
147 const_arg_iterator arg_end() const { return Args + 1 + NumArgs; }
148 arg_iterator arg_begin() { return Args + 1; }
149 arg_iterator arg_end() { return Args + 1 + NumArgs; }
151 unsigned arg_size() const { return NumArgs; }
153 bool isNoReturn() const { return NoReturn; }
155 /// In ARR, whether this function retains its return value. This
156 /// is not always reliable for call sites.
157 bool isReturnsRetained() const { return ReturnsRetained; }
159 /// getCallingConvention - Return the user specified calling
161 unsigned getCallingConvention() const { return CallingConvention; }
163 /// getEffectiveCallingConvention - Return the actual calling convention to
164 /// use, which may depend on the ABI.
165 unsigned getEffectiveCallingConvention() const {
166 return EffectiveCallingConvention;
168 void setEffectiveCallingConvention(unsigned Value) {
169 EffectiveCallingConvention = Value;
172 bool getHasRegParm() const { return HasRegParm; }
173 unsigned getRegParm() const { return RegParm; }
175 CanQualType getReturnType() const { return Args[0].type; }
177 ABIArgInfo &getReturnInfo() { return Args[0].info; }
178 const ABIArgInfo &getReturnInfo() const { return Args[0].info; }
180 void Profile(llvm::FoldingSetNodeID &ID) {
181 ID.AddInteger(getCallingConvention());
182 ID.AddBoolean(NoReturn);
183 ID.AddBoolean(ReturnsRetained);
184 ID.AddBoolean(HasRegParm);
185 ID.AddInteger(RegParm);
186 getReturnType().Profile(ID);
187 for (arg_iterator it = arg_begin(), ie = arg_end(); it != ie; ++it)
188 it->type.Profile(ID);
190 template<class Iterator>
191 static void Profile(llvm::FoldingSetNodeID &ID,
192 const FunctionType::ExtInfo &Info,
196 ID.AddInteger(Info.getCC());
197 ID.AddBoolean(Info.getNoReturn());
198 ID.AddBoolean(Info.getProducesResult());
199 ID.AddBoolean(Info.getHasRegParm());
200 ID.AddInteger(Info.getRegParm());
202 for (; begin != end; ++begin) {
203 CanQualType T = *begin; // force iterator to be over canonical types
209 /// ReturnValueSlot - Contains the address where the return value of a
210 /// function can be stored, and whether the address is volatile or not.
211 class ReturnValueSlot {
212 llvm::PointerIntPair<llvm::Value *, 1, bool> Value;
216 ReturnValueSlot(llvm::Value *Value, bool IsVolatile)
217 : Value(Value, IsVolatile) {}
219 bool isNull() const { return !getValue(); }
221 bool isVolatile() const { return Value.getInt(); }
222 llvm::Value *getValue() const { return Value.getPointer(); }
225 } // end namespace CodeGen
226 } // end namespace clang