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//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// These classes wrap the information about a call or function
// definition used to handle ABI compliancy.
//
//===----------------------------------------------------------------------===//
#ifndef CLANG_LIB_CODEGEN_CIRGENCALL_H
#define CLANG_LIB_CODEGEN_CIRGENCALL_H
#include "CIRGenValue.h"
#include "mlir/IR/Operation.h"
#include "clang/AST/GlobalDecl.h"
#include "llvm/ADT/SmallVector.h"
namespace clang::CIRGen {
class CIRGenFunction;
/// Abstract information about a function or function prototype.
class CIRGenCalleeInfo {
const clang::FunctionProtoType *calleeProtoTy;
clang::GlobalDecl calleeDecl;
public:
explicit CIRGenCalleeInfo() : calleeProtoTy(nullptr), calleeDecl() {}
CIRGenCalleeInfo(const clang::FunctionProtoType *calleeProtoTy,
clang::GlobalDecl calleeDecl)
: calleeProtoTy(calleeProtoTy), calleeDecl(calleeDecl) {}
CIRGenCalleeInfo(clang::GlobalDecl calleeDecl)
: calleeProtoTy(nullptr), calleeDecl(calleeDecl) {}
const clang::FunctionProtoType *getCalleeFunctionProtoType() const {
return calleeProtoTy;
}
clang::GlobalDecl getCalleeDecl() const { return calleeDecl; }
};
class CIRGenCallee {
enum class SpecialKind : uintptr_t {
Invalid,
Builtin,
Last = Builtin,
};
struct BuiltinInfoStorage {
const clang::FunctionDecl *decl;
unsigned id;
};
SpecialKind kindOrFunctionPtr;
union {
CIRGenCalleeInfo abstractInfo;
BuiltinInfoStorage builtinInfo;
};
explicit CIRGenCallee(SpecialKind kind) : kindOrFunctionPtr(kind) {}
public:
CIRGenCallee() : kindOrFunctionPtr(SpecialKind::Invalid) {}
CIRGenCallee(const CIRGenCalleeInfo &abstractInfo, mlir::Operation *funcPtr)
: kindOrFunctionPtr(SpecialKind(reinterpret_cast<uintptr_t>(funcPtr))),
abstractInfo(abstractInfo) {
assert(funcPtr && "configuring callee without function pointer");
}
static CIRGenCallee
forDirect(mlir::Operation *funcPtr,
const CIRGenCalleeInfo &abstractInfo = CIRGenCalleeInfo()) {
return CIRGenCallee(abstractInfo, funcPtr);
}
bool isBuiltin() const { return kindOrFunctionPtr == SpecialKind::Builtin; }
const clang::FunctionDecl *getBuiltinDecl() const {
assert(isBuiltin());
return builtinInfo.decl;
}
unsigned getBuiltinID() const {
assert(isBuiltin());
return builtinInfo.id;
}
static CIRGenCallee forBuiltin(unsigned builtinID,
const clang::FunctionDecl *builtinDecl) {
CIRGenCallee result(SpecialKind::Builtin);
result.builtinInfo.decl = builtinDecl;
result.builtinInfo.id = builtinID;
return result;
}
bool isOrdinary() const {
return uintptr_t(kindOrFunctionPtr) > uintptr_t(SpecialKind::Last);
}
/// If this is a delayed callee computation of some sort, prepare a concrete
/// callee
CIRGenCallee prepareConcreteCallee(CIRGenFunction &cgf) const;
CIRGenCalleeInfo getAbstractInfo() const {
assert(!cir::MissingFeatures::opCallVirtual());
assert(isOrdinary());
return abstractInfo;
}
mlir::Operation *getFunctionPointer() const {
assert(isOrdinary());
return reinterpret_cast<mlir::Operation *>(kindOrFunctionPtr);
}
};
/// Type for representing both the decl and type of parameters to a function.
/// The decl must be either a ParmVarDecl or ImplicitParamDecl.
class FunctionArgList : public llvm::SmallVector<const clang::VarDecl *, 16> {};
struct CallArg {
private:
union {
RValue rv;
LValue lv; // This argument is semantically a load from this l-value
};
bool hasLV;
/// A data-flow flag to make sure getRValue and/or copyInto are not
/// called twice for duplicated IR emission.
mutable bool isUsed;
public:
clang::QualType ty;
CallArg(RValue rv, clang::QualType ty)
: rv(rv), hasLV(false), isUsed(false), ty(ty) {}
CallArg(LValue lv, clang::QualType ty)
: lv(lv), hasLV(true), isUsed(false), ty(ty) {}
bool hasLValue() const { return hasLV; }
LValue getKnownLValue() const {
assert(hasLV && !isUsed);
return lv;
}
RValue getKnownRValue() const {
assert(!hasLV && !isUsed);
return rv;
}
bool isAggregate() const { return hasLV || rv.isAggregate(); }
};
class CallArgList : public llvm::SmallVector<CallArg, 8> {
public:
void add(RValue rvalue, clang::QualType type) { emplace_back(rvalue, type); }
void addUncopiedAggregate(LValue lvalue, clang::QualType type) {
emplace_back(lvalue, type);
}
/// Add all the arguments from another CallArgList to this one. After doing
/// this, the old CallArgList retains its list of arguments, but must not
/// be used to emit a call.
void addFrom(const CallArgList &other) {
insert(end(), other.begin(), other.end());
// Classic codegen has handling for these here. We may not need it here for
// CIR, but if not we should implement equivalent handling in lowering.
assert(!cir::MissingFeatures::writebacks());
assert(!cir::MissingFeatures::cleanupsToDeactivate());
assert(!cir::MissingFeatures::stackBase());
}
};
/// Contains the address where the return value of a function can be stored, and
/// whether the address is volatile or not.
class ReturnValueSlot {
Address addr = Address::invalid();
public:
ReturnValueSlot() = default;
ReturnValueSlot(Address addr) : addr(addr) {}
Address getValue() const { return addr; }
};
} // namespace clang::CIRGen
#endif // CLANG_LIB_CODEGEN_CIRGENCALL_H
|
