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
19 #include "EHScopeStack.h"
20 #include "clang/AST/CanonicalType.h"
21 #include "clang/AST/Type.h"
22 #include "llvm/ADT/FoldingSet.h"
23 #include "llvm/IR/Value.h"
25 // FIXME: Restructure so we don't have to expose so much stuff.
43 typedef SmallVector<llvm::AttributeSet, 8> AttributeListType;
49 CallArg(RValue rv, QualType ty, bool needscopy)
50 : RV(rv), Ty(ty), NeedsCopy(needscopy)
54 /// CallArgList - Type for representing both the value and type of
55 /// arguments in a call.
57 public SmallVector<CallArg, 16> {
60 /// The original argument. Note that the argument l-value
61 /// is potentially null.
64 /// The temporary alloca.
65 llvm::Value *Temporary;
67 /// A value to "use" after the writeback, or null.
71 struct CallArgCleanup {
72 EHScopeStack::stable_iterator Cleanup;
74 /// The "is active" insertion point. This instruction is temporary and
75 /// will be removed after insertion.
76 llvm::Instruction *IsActiveIP;
79 void add(RValue rvalue, QualType type, bool needscopy = false) {
80 push_back(CallArg(rvalue, type, needscopy));
83 void addFrom(const CallArgList &other) {
84 insert(end(), other.begin(), other.end());
85 Writebacks.insert(Writebacks.end(),
86 other.Writebacks.begin(), other.Writebacks.end());
89 void addWriteback(LValue srcLV, llvm::Value *temporary,
92 writeback.Source = srcLV;
93 writeback.Temporary = temporary;
94 writeback.ToUse = toUse;
95 Writebacks.push_back(writeback);
98 bool hasWritebacks() const { return !Writebacks.empty(); }
100 typedef SmallVectorImpl<Writeback>::const_iterator writeback_iterator;
101 writeback_iterator writeback_begin() const { return Writebacks.begin(); }
102 writeback_iterator writeback_end() const { return Writebacks.end(); }
104 void addArgCleanupDeactivation(EHScopeStack::stable_iterator Cleanup,
105 llvm::Instruction *IsActiveIP) {
106 CallArgCleanup ArgCleanup;
107 ArgCleanup.Cleanup = Cleanup;
108 ArgCleanup.IsActiveIP = IsActiveIP;
109 CleanupsToDeactivate.push_back(ArgCleanup);
112 ArrayRef<CallArgCleanup> getCleanupsToDeactivate() const {
113 return CleanupsToDeactivate;
117 SmallVector<Writeback, 1> Writebacks;
119 /// Deactivate these cleanups immediately before making the call. This
120 /// is used to cleanup objects that are owned by the callee once the call
122 SmallVector<CallArgCleanup, 1> CleanupsToDeactivate;
125 /// FunctionArgList - Type for representing both the decl and type
126 /// of parameters to a function. The decl must be either a
127 /// ParmVarDecl or ImplicitParamDecl.
128 class FunctionArgList : public SmallVector<const VarDecl*, 16> {
131 /// ReturnValueSlot - Contains the address where the return value of a
132 /// function can be stored, and whether the address is volatile or not.
133 class ReturnValueSlot {
134 llvm::PointerIntPair<llvm::Value *, 1, bool> Value;
138 ReturnValueSlot(llvm::Value *Value, bool IsVolatile)
139 : Value(Value, IsVolatile) {}
141 bool isNull() const { return !getValue(); }
143 bool isVolatile() const { return Value.getInt(); }
144 llvm::Value *getValue() const { return Value.getPointer(); }
147 } // end namespace CodeGen
148 } // end namespace clang