forked from OSchip/llvm-project
309 lines
9.8 KiB
C++
309 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 LLVM_CLANG_LIB_CODEGEN_CGCALL_H
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#define LLVM_CLANG_LIB_CODEGEN_CGCALL_H
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#include "CGValue.h"
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#include "EHScopeStack.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/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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class AttributeList;
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class Function;
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class Type;
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class Value;
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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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/// Abstract information about a function or function prototype.
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class CGCalleeInfo {
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/// \brief The function prototype of the callee.
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const FunctionProtoType *CalleeProtoTy;
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/// \brief The function declaration of the callee.
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const Decl *CalleeDecl;
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public:
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explicit CGCalleeInfo() : CalleeProtoTy(nullptr), CalleeDecl(nullptr) {}
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CGCalleeInfo(const FunctionProtoType *calleeProtoTy, const Decl *calleeDecl)
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: CalleeProtoTy(calleeProtoTy), CalleeDecl(calleeDecl) {}
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CGCalleeInfo(const FunctionProtoType *calleeProtoTy)
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: CalleeProtoTy(calleeProtoTy), CalleeDecl(nullptr) {}
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CGCalleeInfo(const Decl *calleeDecl)
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: CalleeProtoTy(nullptr), CalleeDecl(calleeDecl) {}
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const FunctionProtoType *getCalleeFunctionProtoType() const {
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return CalleeProtoTy;
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}
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const Decl *getCalleeDecl() const { return CalleeDecl; }
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};
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/// All available information about a concrete callee.
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class CGCallee {
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enum class SpecialKind : uintptr_t {
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Invalid,
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Builtin,
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PseudoDestructor,
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Last = PseudoDestructor
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};
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struct BuiltinInfoStorage {
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const FunctionDecl *Decl;
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unsigned ID;
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};
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struct PseudoDestructorInfoStorage {
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const CXXPseudoDestructorExpr *Expr;
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};
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SpecialKind KindOrFunctionPointer;
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union {
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CGCalleeInfo AbstractInfo;
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BuiltinInfoStorage BuiltinInfo;
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PseudoDestructorInfoStorage PseudoDestructorInfo;
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};
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explicit CGCallee(SpecialKind kind) : KindOrFunctionPointer(kind) {}
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CGCallee(const FunctionDecl *builtinDecl, unsigned builtinID)
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: KindOrFunctionPointer(SpecialKind::Builtin) {
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BuiltinInfo.Decl = builtinDecl;
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BuiltinInfo.ID = builtinID;
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}
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public:
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CGCallee() : KindOrFunctionPointer(SpecialKind::Invalid) {}
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/// Construct a callee. Call this constructor directly when this
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/// isn't a direct call.
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CGCallee(const CGCalleeInfo &abstractInfo, llvm::Value *functionPtr)
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: KindOrFunctionPointer(SpecialKind(uintptr_t(functionPtr))) {
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AbstractInfo = abstractInfo;
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assert(functionPtr && "configuring callee without function pointer");
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assert(functionPtr->getType()->isPointerTy());
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assert(functionPtr->getType()->getPointerElementType()->isFunctionTy());
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}
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static CGCallee forBuiltin(unsigned builtinID,
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const FunctionDecl *builtinDecl) {
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CGCallee result(SpecialKind::Builtin);
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result.BuiltinInfo.Decl = builtinDecl;
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result.BuiltinInfo.ID = builtinID;
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return result;
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}
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static CGCallee forPseudoDestructor(const CXXPseudoDestructorExpr *E) {
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CGCallee result(SpecialKind::PseudoDestructor);
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result.PseudoDestructorInfo.Expr = E;
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return result;
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}
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static CGCallee forDirect(llvm::Constant *functionPtr,
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const CGCalleeInfo &abstractInfo = CGCalleeInfo()) {
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return CGCallee(abstractInfo, functionPtr);
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}
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bool isBuiltin() const {
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return KindOrFunctionPointer == SpecialKind::Builtin;
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}
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const FunctionDecl *getBuiltinDecl() const {
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assert(isBuiltin());
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return BuiltinInfo.Decl;
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}
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unsigned getBuiltinID() const {
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assert(isBuiltin());
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return BuiltinInfo.ID;
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}
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bool isPseudoDestructor() const {
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return KindOrFunctionPointer == SpecialKind::PseudoDestructor;
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}
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const CXXPseudoDestructorExpr *getPseudoDestructorExpr() const {
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assert(isPseudoDestructor());
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return PseudoDestructorInfo.Expr;
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}
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bool isOrdinary() const {
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return uintptr_t(KindOrFunctionPointer) > uintptr_t(SpecialKind::Last);
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}
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const CGCalleeInfo &getAbstractInfo() const {
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assert(isOrdinary());
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return AbstractInfo;
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}
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llvm::Value *getFunctionPointer() const {
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assert(isOrdinary());
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return reinterpret_cast<llvm::Value*>(uintptr_t(KindOrFunctionPointer));
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}
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llvm::FunctionType *getFunctionType() const {
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return cast<llvm::FunctionType>(
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getFunctionPointer()->getType()->getPointerElementType());
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}
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void setFunctionPointer(llvm::Value *functionPtr) {
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assert(isOrdinary());
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KindOrFunctionPointer = SpecialKind(uintptr_t(functionPtr));
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}
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};
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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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CallArgList() : StackBase(nullptr) {}
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struct Writeback {
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/// The original argument. Note that the argument l-value
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/// is potentially null.
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LValue Source;
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/// The temporary alloca.
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Address Temporary;
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/// A value to "use" after the writeback, or null.
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llvm::Value *ToUse;
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};
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struct CallArgCleanup {
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EHScopeStack::stable_iterator Cleanup;
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/// The "is active" insertion point. This instruction is temporary and
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/// will be removed after insertion.
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llvm::Instruction *IsActiveIP;
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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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/// Add all the arguments from another CallArgList to this one. After doing
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/// this, the old CallArgList retains its list of arguments, but must not
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/// be used to emit a call.
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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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CleanupsToDeactivate.insert(CleanupsToDeactivate.end(),
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other.CleanupsToDeactivate.begin(),
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other.CleanupsToDeactivate.end());
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assert(!(StackBase && other.StackBase) && "can't merge stackbases");
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if (!StackBase)
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StackBase = other.StackBase;
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}
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void addWriteback(LValue srcLV, Address temporary,
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llvm::Value *toUse) {
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Writeback writeback = { srcLV, temporary, toUse };
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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 llvm::iterator_range<SmallVectorImpl<Writeback>::const_iterator>
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writeback_const_range;
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writeback_const_range writebacks() const {
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return writeback_const_range(Writebacks.begin(), Writebacks.end());
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}
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void addArgCleanupDeactivation(EHScopeStack::stable_iterator Cleanup,
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llvm::Instruction *IsActiveIP) {
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CallArgCleanup ArgCleanup;
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ArgCleanup.Cleanup = Cleanup;
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ArgCleanup.IsActiveIP = IsActiveIP;
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CleanupsToDeactivate.push_back(ArgCleanup);
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}
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ArrayRef<CallArgCleanup> getCleanupsToDeactivate() const {
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return CleanupsToDeactivate;
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}
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void allocateArgumentMemory(CodeGenFunction &CGF);
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llvm::Instruction *getStackBase() const { return StackBase; }
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void freeArgumentMemory(CodeGenFunction &CGF) const;
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/// \brief Returns if we're using an inalloca struct to pass arguments in
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/// memory.
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bool isUsingInAlloca() const { return StackBase; }
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private:
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SmallVector<Writeback, 1> Writebacks;
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/// Deactivate these cleanups immediately before making the call. This
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/// is used to cleanup objects that are owned by the callee once the call
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/// occurs.
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SmallVector<CallArgCleanup, 1> CleanupsToDeactivate;
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/// The stacksave call. It dominates all of the argument evaluation.
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llvm::CallInst *StackBase;
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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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/// 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 *, 2, unsigned int> Value;
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CharUnits Alignment;
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// Return value slot flags
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enum Flags {
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IS_VOLATILE = 0x1,
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IS_UNUSED = 0x2,
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};
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public:
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ReturnValueSlot() {}
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ReturnValueSlot(Address Addr, bool IsVolatile, bool IsUnused = false)
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: Value(Addr.isValid() ? Addr.getPointer() : nullptr,
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(IsVolatile ? IS_VOLATILE : 0) | (IsUnused ? IS_UNUSED : 0)),
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Alignment(Addr.isValid() ? Addr.getAlignment() : CharUnits::Zero()) {}
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bool isNull() const { return !getValue().isValid(); }
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bool isVolatile() const { return Value.getInt() & IS_VOLATILE; }
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Address getValue() const { return Address(Value.getPointer(), Alignment); }
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bool isUnused() const { return Value.getInt() & IS_UNUSED; }
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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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