forked from OSchip/llvm-project
306 lines
9.8 KiB
C++
306 lines
9.8 KiB
C++
//===----- CGCall.h - Encapsulate calling convention details ----*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// These classes wrap the information about a call or function
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// definition used to handle ABI compliancy.
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//
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//===----------------------------------------------------------------------===//
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#ifndef CLANG_CODEGEN_CGCALL_H
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#define CLANG_CODEGEN_CGCALL_H
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#include "CGValue.h"
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#include "clang/AST/CanonicalType.h"
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#include "clang/AST/Type.h"
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#include "llvm/ADT/FoldingSet.h"
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#include "llvm/IR/Value.h"
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// FIXME: Restructure so we don't have to expose so much stuff.
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#include "ABIInfo.h"
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namespace llvm {
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struct AttributeWithIndex;
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class Function;
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class Type;
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class Value;
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template<typename T, unsigned> class SmallVector;
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}
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namespace clang {
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class ASTContext;
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class Decl;
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class FunctionDecl;
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class ObjCMethodDecl;
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class VarDecl;
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namespace CodeGen {
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typedef SmallVector<llvm::AttributeWithIndex, 8> AttributeListType;
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struct CallArg {
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RValue RV;
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QualType Ty;
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bool NeedsCopy;
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CallArg(RValue rv, QualType ty, bool needscopy)
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: RV(rv), Ty(ty), NeedsCopy(needscopy)
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{ }
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};
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/// CallArgList - Type for representing both the value and type of
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/// arguments in a call.
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class CallArgList :
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public SmallVector<CallArg, 16> {
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public:
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struct Writeback {
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/// The original argument.
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llvm::Value *Address;
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/// The pointee type of the original argument.
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QualType AddressType;
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/// The temporary alloca.
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llvm::Value *Temporary;
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};
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void add(RValue rvalue, QualType type, bool needscopy = false) {
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push_back(CallArg(rvalue, type, needscopy));
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}
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void addFrom(const CallArgList &other) {
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insert(end(), other.begin(), other.end());
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Writebacks.insert(Writebacks.end(),
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other.Writebacks.begin(), other.Writebacks.end());
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}
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void addWriteback(llvm::Value *address, QualType addressType,
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llvm::Value *temporary) {
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Writeback writeback;
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writeback.Address = address;
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writeback.AddressType = addressType;
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writeback.Temporary = temporary;
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Writebacks.push_back(writeback);
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}
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bool hasWritebacks() const { return !Writebacks.empty(); }
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typedef SmallVectorImpl<Writeback>::const_iterator writeback_iterator;
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writeback_iterator writeback_begin() const { return Writebacks.begin(); }
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writeback_iterator writeback_end() const { return Writebacks.end(); }
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private:
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SmallVector<Writeback, 1> Writebacks;
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};
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/// A class for recording the number of arguments that a function
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/// signature requires.
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class RequiredArgs {
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/// The number of required arguments, or ~0 if the signature does
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/// not permit optional arguments.
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unsigned NumRequired;
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public:
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enum All_t { All };
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RequiredArgs(All_t _) : NumRequired(~0U) {}
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explicit RequiredArgs(unsigned n) : NumRequired(n) {
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assert(n != ~0U);
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}
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/// Compute the arguments required by the given formal prototype,
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/// given that there may be some additional, non-formal arguments
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/// in play.
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static RequiredArgs forPrototypePlus(const FunctionProtoType *prototype,
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unsigned additional) {
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if (!prototype->isVariadic()) return All;
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return RequiredArgs(prototype->getNumArgs() + additional);
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}
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static RequiredArgs forPrototype(const FunctionProtoType *prototype) {
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return forPrototypePlus(prototype, 0);
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}
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static RequiredArgs forPrototype(CanQual<FunctionProtoType> prototype) {
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return forPrototype(prototype.getTypePtr());
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}
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static RequiredArgs forPrototypePlus(CanQual<FunctionProtoType> prototype,
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unsigned additional) {
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return forPrototypePlus(prototype.getTypePtr(), additional);
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}
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bool allowsOptionalArgs() const { return NumRequired != ~0U; }
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unsigned getNumRequiredArgs() const {
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assert(allowsOptionalArgs());
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return NumRequired;
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}
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unsigned getOpaqueData() const { return NumRequired; }
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static RequiredArgs getFromOpaqueData(unsigned value) {
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if (value == ~0U) return All;
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return RequiredArgs(value);
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}
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};
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/// FunctionArgList - Type for representing both the decl and type
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/// of parameters to a function. The decl must be either a
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/// ParmVarDecl or ImplicitParamDecl.
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class FunctionArgList : public SmallVector<const VarDecl*, 16> {
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};
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/// CGFunctionInfo - Class to encapsulate the information about a
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/// function definition.
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class CGFunctionInfo : public llvm::FoldingSetNode {
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struct ArgInfo {
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CanQualType type;
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ABIArgInfo info;
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};
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/// The LLVM::CallingConv to use for this function (as specified by the
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/// user).
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unsigned CallingConvention : 8;
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/// The LLVM::CallingConv to actually use for this function, which may
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/// depend on the ABI.
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unsigned EffectiveCallingConvention : 8;
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/// The clang::CallingConv that this was originally created with.
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unsigned ASTCallingConvention : 8;
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/// Whether this function is noreturn.
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unsigned NoReturn : 1;
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/// Whether this function is returns-retained.
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unsigned ReturnsRetained : 1;
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/// How many arguments to pass inreg.
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unsigned HasRegParm : 1;
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unsigned RegParm : 4;
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RequiredArgs Required;
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unsigned NumArgs;
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ArgInfo *getArgsBuffer() {
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return reinterpret_cast<ArgInfo*>(this+1);
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}
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const ArgInfo *getArgsBuffer() const {
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return reinterpret_cast<const ArgInfo*>(this + 1);
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}
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CGFunctionInfo() : Required(RequiredArgs::All) {}
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public:
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static CGFunctionInfo *create(unsigned llvmCC,
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const FunctionType::ExtInfo &extInfo,
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CanQualType resultType,
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ArrayRef<CanQualType> argTypes,
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RequiredArgs required);
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typedef const ArgInfo *const_arg_iterator;
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typedef ArgInfo *arg_iterator;
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const_arg_iterator arg_begin() const { return getArgsBuffer() + 1; }
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const_arg_iterator arg_end() const { return getArgsBuffer() + 1 + NumArgs; }
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arg_iterator arg_begin() { return getArgsBuffer() + 1; }
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arg_iterator arg_end() { return getArgsBuffer() + 1 + NumArgs; }
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unsigned arg_size() const { return NumArgs; }
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bool isVariadic() const { return Required.allowsOptionalArgs(); }
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RequiredArgs getRequiredArgs() const { return Required; }
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bool isNoReturn() const { return NoReturn; }
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/// In ARC, whether this function retains its return value. This
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/// is not always reliable for call sites.
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bool isReturnsRetained() const { return ReturnsRetained; }
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/// getASTCallingConvention() - Return the AST-specified calling
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/// convention.
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CallingConv getASTCallingConvention() const {
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return CallingConv(ASTCallingConvention);
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}
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/// getCallingConvention - Return the user specified calling
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/// convention, which has been translated into an LLVM CC.
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unsigned getCallingConvention() const { return CallingConvention; }
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/// getEffectiveCallingConvention - Return the actual calling convention to
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/// use, which may depend on the ABI.
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unsigned getEffectiveCallingConvention() const {
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return EffectiveCallingConvention;
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}
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void setEffectiveCallingConvention(unsigned Value) {
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EffectiveCallingConvention = Value;
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}
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bool getHasRegParm() const { return HasRegParm; }
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unsigned getRegParm() const { return RegParm; }
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FunctionType::ExtInfo getExtInfo() const {
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return FunctionType::ExtInfo(isNoReturn(),
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getHasRegParm(), getRegParm(),
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getASTCallingConvention(),
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isReturnsRetained());
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}
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CanQualType getReturnType() const { return getArgsBuffer()[0].type; }
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ABIArgInfo &getReturnInfo() { return getArgsBuffer()[0].info; }
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const ABIArgInfo &getReturnInfo() const { return getArgsBuffer()[0].info; }
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void Profile(llvm::FoldingSetNodeID &ID) {
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ID.AddInteger(getASTCallingConvention());
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ID.AddBoolean(NoReturn);
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ID.AddBoolean(ReturnsRetained);
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ID.AddBoolean(HasRegParm);
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ID.AddInteger(RegParm);
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ID.AddInteger(Required.getOpaqueData());
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getReturnType().Profile(ID);
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for (arg_iterator it = arg_begin(), ie = arg_end(); it != ie; ++it)
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it->type.Profile(ID);
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}
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static void Profile(llvm::FoldingSetNodeID &ID,
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const FunctionType::ExtInfo &info,
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RequiredArgs required,
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CanQualType resultType,
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ArrayRef<CanQualType> argTypes) {
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ID.AddInteger(info.getCC());
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ID.AddBoolean(info.getNoReturn());
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ID.AddBoolean(info.getProducesResult());
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ID.AddBoolean(info.getHasRegParm());
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ID.AddInteger(info.getRegParm());
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ID.AddInteger(required.getOpaqueData());
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resultType.Profile(ID);
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for (ArrayRef<CanQualType>::iterator
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i = argTypes.begin(), e = argTypes.end(); i != e; ++i) {
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i->Profile(ID);
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}
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}
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};
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/// ReturnValueSlot - Contains the address where the return value of a
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/// function can be stored, and whether the address is volatile or not.
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class ReturnValueSlot {
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llvm::PointerIntPair<llvm::Value *, 1, bool> Value;
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public:
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ReturnValueSlot() {}
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ReturnValueSlot(llvm::Value *Value, bool IsVolatile)
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: Value(Value, IsVolatile) {}
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bool isNull() const { return !getValue(); }
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bool isVolatile() const { return Value.getInt(); }
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llvm::Value *getValue() const { return Value.getPointer(); }
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};
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} // end namespace CodeGen
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} // end namespace clang
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#endif
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