151 lines
4.4 KiB
C++
151 lines
4.4 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 "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/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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class AttributeSet;
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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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typedef SmallVector<llvm::AttributeSet, 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. 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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llvm::Value *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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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(LValue srcLV, llvm::Value *temporary,
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llvm::Value *toUse) {
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Writeback writeback;
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writeback.Source = srcLV;
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writeback.Temporary = temporary;
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writeback.ToUse = 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 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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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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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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};
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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 *, 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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