//
//===----------------------------------------------------------------------===//
-#ifndef CLANG_CODEGEN_CGCALL_H
-#define CLANG_CODEGEN_CGCALL_H
+#ifndef LLVM_CLANG_LIB_CODEGEN_CGCALL_H
+#define LLVM_CLANG_LIB_CODEGEN_CGCALL_H
#include "CGValue.h"
+#include "EHScopeStack.h"
#include "clang/AST/CanonicalType.h"
#include "clang/AST/Type.h"
#include "llvm/ADT/FoldingSet.h"
#include "ABIInfo.h"
namespace llvm {
- struct AttributeWithIndex;
+ class AttributeSet;
class Function;
class Type;
class Value;
-
- template<typename T, unsigned> class SmallVector;
}
namespace clang {
class VarDecl;
namespace CodeGen {
- typedef SmallVector<llvm::AttributeWithIndex, 8> AttributeListType;
+ typedef SmallVector<llvm::AttributeSet, 8> AttributeListType;
struct CallArg {
RValue RV;
class CallArgList :
public SmallVector<CallArg, 16> {
public:
- struct Writeback {
- /// The original argument.
- llvm::Value *Address;
+ CallArgList() : StackBase(nullptr), StackBaseMem(nullptr) {}
- /// The pointee type of the original argument.
- QualType AddressType;
+ struct Writeback {
+ /// The original argument. Note that the argument l-value
+ /// is potentially null.
+ LValue Source;
/// The temporary alloca.
llvm::Value *Temporary;
+
+ /// A value to "use" after the writeback, or null.
+ llvm::Value *ToUse;
+ };
+
+ struct CallArgCleanup {
+ EHScopeStack::stable_iterator Cleanup;
+
+ /// The "is active" insertion point. This instruction is temporary and
+ /// will be removed after insertion.
+ llvm::Instruction *IsActiveIP;
};
void add(RValue rvalue, QualType type, bool needscopy = false) {
other.Writebacks.begin(), other.Writebacks.end());
}
- void addWriteback(llvm::Value *address, QualType addressType,
- llvm::Value *temporary) {
+ void addWriteback(LValue srcLV, llvm::Value *temporary,
+ llvm::Value *toUse) {
Writeback writeback;
- writeback.Address = address;
- writeback.AddressType = addressType;
+ writeback.Source = srcLV;
writeback.Temporary = temporary;
+ writeback.ToUse = toUse;
Writebacks.push_back(writeback);
}
bool hasWritebacks() const { return !Writebacks.empty(); }
- typedef SmallVectorImpl<Writeback>::const_iterator writeback_iterator;
- writeback_iterator writeback_begin() const { return Writebacks.begin(); }
- writeback_iterator writeback_end() const { return Writebacks.end(); }
+ typedef llvm::iterator_range<SmallVectorImpl<Writeback>::const_iterator>
+ writeback_const_range;
- private:
- SmallVector<Writeback, 1> Writebacks;
- };
-
- /// A class for recording the number of arguments that a function
- /// signature requires.
- class RequiredArgs {
- /// The number of required arguments, or ~0 if the signature does
- /// not permit optional arguments.
- unsigned NumRequired;
- public:
- enum All_t { All };
-
- RequiredArgs(All_t _) : NumRequired(~0U) {}
- explicit RequiredArgs(unsigned n) : NumRequired(n) {
- assert(n != ~0U);
+ writeback_const_range writebacks() const {
+ return writeback_const_range(Writebacks.begin(), Writebacks.end());
}
- /// Compute the arguments required by the given formal prototype,
- /// given that there may be some additional, non-formal arguments
- /// in play.
- static RequiredArgs forPrototypePlus(const FunctionProtoType *prototype,
- unsigned additional) {
- if (!prototype->isVariadic()) return All;
- return RequiredArgs(prototype->getNumArgs() + additional);
+ void addArgCleanupDeactivation(EHScopeStack::stable_iterator Cleanup,
+ llvm::Instruction *IsActiveIP) {
+ CallArgCleanup ArgCleanup;
+ ArgCleanup.Cleanup = Cleanup;
+ ArgCleanup.IsActiveIP = IsActiveIP;
+ CleanupsToDeactivate.push_back(ArgCleanup);
}
- static RequiredArgs forPrototype(const FunctionProtoType *prototype) {
- return forPrototypePlus(prototype, 0);
+ ArrayRef<CallArgCleanup> getCleanupsToDeactivate() const {
+ return CleanupsToDeactivate;
}
- static RequiredArgs forPrototype(CanQual<FunctionProtoType> prototype) {
- return forPrototype(prototype.getTypePtr());
- }
+ void allocateArgumentMemory(CodeGenFunction &CGF);
+ llvm::Instruction *getStackBase() const { return StackBase; }
+ void freeArgumentMemory(CodeGenFunction &CGF) const;
- static RequiredArgs forPrototypePlus(CanQual<FunctionProtoType> prototype,
- unsigned additional) {
- return forPrototypePlus(prototype.getTypePtr(), additional);
- }
+ /// \brief Returns if we're using an inalloca struct to pass arguments in
+ /// memory.
+ bool isUsingInAlloca() const { return StackBase; }
- bool allowsOptionalArgs() const { return NumRequired != ~0U; }
- unsigned getNumRequiredArgs() const {
- assert(allowsOptionalArgs());
- return NumRequired;
- }
+ private:
+ SmallVector<Writeback, 1> Writebacks;
- unsigned getOpaqueData() const { return NumRequired; }
- static RequiredArgs getFromOpaqueData(unsigned value) {
- if (value == ~0U) return All;
- return RequiredArgs(value);
- }
+ /// Deactivate these cleanups immediately before making the call. This
+ /// is used to cleanup objects that are owned by the callee once the call
+ /// occurs.
+ SmallVector<CallArgCleanup, 1> CleanupsToDeactivate;
+
+ /// The stacksave call. It dominates all of the argument evaluation.
+ llvm::CallInst *StackBase;
+
+ /// The alloca holding the stackbase. We need it to maintain SSA form.
+ llvm::AllocaInst *StackBaseMem;
+
+ /// The iterator pointing to the stack restore cleanup. We manually run and
+ /// deactivate this cleanup after the call in the unexceptional case because
+ /// it doesn't run in the normal order.
+ EHScopeStack::stable_iterator StackCleanup;
};
/// FunctionArgList - Type for representing both the decl and type
class FunctionArgList : public SmallVector<const VarDecl*, 16> {
};
- /// CGFunctionInfo - Class to encapsulate the information about a
- /// function definition.
- class CGFunctionInfo : public llvm::FoldingSetNode {
- struct ArgInfo {
- CanQualType type;
- ABIArgInfo info;
- };
-
- /// The LLVM::CallingConv to use for this function (as specified by the
- /// user).
- unsigned CallingConvention : 8;
-
- /// The LLVM::CallingConv to actually use for this function, which may
- /// depend on the ABI.
- unsigned EffectiveCallingConvention : 8;
-
- /// The clang::CallingConv that this was originally created with.
- unsigned ASTCallingConvention : 8;
-
- /// Whether this function is noreturn.
- unsigned NoReturn : 1;
-
- /// Whether this function is returns-retained.
- unsigned ReturnsRetained : 1;
-
- /// How many arguments to pass inreg.
- unsigned HasRegParm : 1;
- unsigned RegParm : 4;
-
- RequiredArgs Required;
-
- unsigned NumArgs;
- ArgInfo *getArgsBuffer() {
- return reinterpret_cast<ArgInfo*>(this+1);
- }
- const ArgInfo *getArgsBuffer() const {
- return reinterpret_cast<const ArgInfo*>(this + 1);
- }
-
- CGFunctionInfo() : Required(RequiredArgs::All) {}
-
- public:
- static CGFunctionInfo *create(unsigned llvmCC,
- const FunctionType::ExtInfo &extInfo,
- CanQualType resultType,
- ArrayRef<CanQualType> argTypes,
- RequiredArgs required);
-
- typedef const ArgInfo *const_arg_iterator;
- typedef ArgInfo *arg_iterator;
-
- const_arg_iterator arg_begin() const { return getArgsBuffer() + 1; }
- const_arg_iterator arg_end() const { return getArgsBuffer() + 1 + NumArgs; }
- arg_iterator arg_begin() { return getArgsBuffer() + 1; }
- arg_iterator arg_end() { return getArgsBuffer() + 1 + NumArgs; }
-
- unsigned arg_size() const { return NumArgs; }
-
- bool isVariadic() const { return Required.allowsOptionalArgs(); }
- RequiredArgs getRequiredArgs() const { return Required; }
-
- bool isNoReturn() const { return NoReturn; }
-
- /// In ARC, whether this function retains its return value. This
- /// is not always reliable for call sites.
- bool isReturnsRetained() const { return ReturnsRetained; }
-
- /// getASTCallingConvention() - Return the AST-specified calling
- /// convention.
- CallingConv getASTCallingConvention() const {
- return CallingConv(ASTCallingConvention);
- }
-
- /// getCallingConvention - Return the user specified calling
- /// convention, which has been translated into an LLVM CC.
- unsigned getCallingConvention() const { return CallingConvention; }
-
- /// getEffectiveCallingConvention - Return the actual calling convention to
- /// use, which may depend on the ABI.
- unsigned getEffectiveCallingConvention() const {
- return EffectiveCallingConvention;
- }
- void setEffectiveCallingConvention(unsigned Value) {
- EffectiveCallingConvention = Value;
- }
-
- bool getHasRegParm() const { return HasRegParm; }
- unsigned getRegParm() const { return RegParm; }
-
- FunctionType::ExtInfo getExtInfo() const {
- return FunctionType::ExtInfo(isNoReturn(),
- getHasRegParm(), getRegParm(),
- getASTCallingConvention(),
- isReturnsRetained());
- }
-
- CanQualType getReturnType() const { return getArgsBuffer()[0].type; }
-
- ABIArgInfo &getReturnInfo() { return getArgsBuffer()[0].info; }
- const ABIArgInfo &getReturnInfo() const { return getArgsBuffer()[0].info; }
-
- void Profile(llvm::FoldingSetNodeID &ID) {
- ID.AddInteger(getASTCallingConvention());
- ID.AddBoolean(NoReturn);
- ID.AddBoolean(ReturnsRetained);
- ID.AddBoolean(HasRegParm);
- ID.AddInteger(RegParm);
- ID.AddInteger(Required.getOpaqueData());
- getReturnType().Profile(ID);
- for (arg_iterator it = arg_begin(), ie = arg_end(); it != ie; ++it)
- it->type.Profile(ID);
- }
- static void Profile(llvm::FoldingSetNodeID &ID,
- const FunctionType::ExtInfo &info,
- RequiredArgs required,
- CanQualType resultType,
- ArrayRef<CanQualType> argTypes) {
- ID.AddInteger(info.getCC());
- ID.AddBoolean(info.getNoReturn());
- ID.AddBoolean(info.getProducesResult());
- ID.AddBoolean(info.getHasRegParm());
- ID.AddInteger(info.getRegParm());
- ID.AddInteger(required.getOpaqueData());
- resultType.Profile(ID);
- for (ArrayRef<CanQualType>::iterator
- i = argTypes.begin(), e = argTypes.end(); i != e; ++i) {
- i->Profile(ID);
- }
- }
- };
-
/// ReturnValueSlot - Contains the address where the return value of a
/// function can be stored, and whether the address is volatile or not.
class ReturnValueSlot {
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