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//===--- CGArray.cpp - Emit LLVM Code for Array operations and Expr -----===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#ifndef FLANG_CODEGEN_CGARRAY_H
#define FLANG_CODEGEN_CGARRAY_H
#include "CGValue.h"
#include "CodeGenFunction.h"
#include "flang/AST/ExprVisitor.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/DenseMap.h"
namespace flang {
namespace CodeGen {
/// ArrayValueExprEmitter - Emits the information about an array.
class ArrayValueExprEmitter
: public ConstExprVisitor<ArrayValueExprEmitter> {
CodeGenFunction &CGF;
CGBuilderTy &Builder;
llvm::LLVMContext &VMContext;
llvm::Value *Offset;
llvm::Value *Ptr;
bool GetPointer;
SmallVector<ArrayDimensionValueTy, 8> Dims;
void EmitSections();
void IncrementOffset(llvm::Value *OffsetDelta);
public:
ArrayValueExprEmitter(CodeGenFunction &cgf, bool getPointer = true);
void EmitExpr(const Expr *E);
void VisitVarExpr(const VarExpr *E);
void VisitArrayConstructorExpr(const ArrayConstructorExpr *E);
void VisitArraySectionExpr(const ArraySectionExpr *E);
ArrayRef<ArrayDimensionValueTy> getDimensions() const {
return Dims;
}
llvm::Value *getPointer() const {
return Ptr;
}
ArrayValueRef getResult() const {
return ArrayValueRef(Dims, Ptr, Offset);
}
};
/// ArrayOperation - Represents an array expression / statement.
/// Stores the array sections and scalars used in the array operation.
class ArrayOperation {
struct StoredArrayValue {
size_t DataOffset;
llvm::Value *Ptr;
llvm::Value *Offset;
};
llvm::SmallDenseMap<const Expr*, StoredArrayValue, 8> Arrays;
llvm::SmallDenseMap<const Expr*, RValueTy, 8> Scalars;
SmallVector<ArrayDimensionValueTy, 32> Dims;
protected:
/// \brief Emits a scalar value used for the given scalar expression.
void EmitScalarValue(CodeGenFunction &CGF, const Expr *E);
/// \brief Emits the array sections used for the given expression.
void EmitArraySections(CodeGenFunction &CGF, const Expr *E);
friend class ScalarEmitterAndSectionGatherer;
public:
/// \brief Returns the array value used for the given expression.
ArrayValueRef getArrayValue(const Expr *E);
/// \brief Returns the value used for the given scalar expression.
RValueTy getScalarValue(const Expr *E);
/// \brief Emits the array section used on the left side of an assignment
/// in a multidimensional loop.
ArrayValueRef EmitArrayExpr(CodeGenFunction &CGF, const Expr *E);
/// EmitAllScalarValuesAndArraySections - walks the given expression,
/// and prepares the array operation for a multidimensional loop by emitting
/// scalar expressions, so that they are only executed once in an array operation,
/// and also by emmitting the array sections which are used to access the array
/// elements inside the operation's loop.
void EmitAllScalarValuesAndArraySections(CodeGenFunction &CGF, const Expr *E);
};
/// StandaloneArrayValueSectionGatherer - Gathers the array sections
/// which are needed for a standalone array expression.
class StandaloneArrayValueSectionGatherer
: public ConstExprVisitor<StandaloneArrayValueSectionGatherer> {
CodeGenFunction &CGF;
ArrayOperation &Operation;
bool Gathered;
SmallVector<ArrayDimensionValueTy, 8> Dims;
void GatherSections(const Expr *E);
public:
StandaloneArrayValueSectionGatherer(CodeGenFunction &cgf,
ArrayOperation &Op);
void EmitExpr(const Expr *E);
void VisitVarExpr(const VarExpr *E);
void VisitArrayConstructorExpr(const ArrayConstructorExpr *E);
void VisitBinaryExpr(const BinaryExpr *E);
void VisitUnaryExpr(const UnaryExpr *E);
void VisitImplicitCastExpr(const ImplicitCastExpr *E);
void VisitIntrinsicCallExpr(const IntrinsicCallExpr *E);
void VisitArraySectionExpr(const ArraySectionExpr *E);
ArrayValueRef getResult() const {
return ArrayValueRef(Dims, nullptr);
}
};
/// ArrayLoopEmitter - Emits the multidimensional loop which
/// is used to iterate over array sections in an array expression.
class ArrayLoopEmitter {
private:
/// Loop - stores some information about the generated loops.
struct Loop {
llvm::BasicBlock *EndBlock;
llvm::BasicBlock *TestBlock;
llvm::Value *Counter;
};
CodeGenFunction &CGF;
CGBuilderTy &Builder;
/// ElementInfo - stores the current loop index for all
/// dimensions, or null if the loop index doesn't apply
/// (i.e. element section).
SmallVector<llvm::Value *, 8> Elements;
SmallVector<Loop, 8> Loops;
public:
ArrayLoopEmitter(CodeGenFunction &cgf);
/// EmitSectionIndex - computes the index of the element during
/// the current iteration of the multidimensional loop
/// for the given dimension.
llvm::Value *EmitSectionOffset(const ArrayValueRef &Array,
int I);
/// EmitElementOffset - computes the offset of the
/// current element in the given array.
llvm::Value *EmitElementOffset(const ArrayValueRef &Array);
/// EmitElementOneDimensionalIndex - computes the
/// index (which starts with 1) for the current element in the given array.
llvm::Value *EmitElementOneDimensionalIndex(const ArrayValueRef &Array);
/// EmitElelementPointer - returns the pointer to the current
/// element in the given array.
llvm::Value *EmitElementPointer(const ArrayValueRef &Array);
/// EmitArrayIterationBegin - Emits the beginning of a
/// multidimensional loop which iterates over the given array section.
void EmitArrayIterationBegin(const ArrayValueRef &Array);
/// EmitArrayIterationEnd - Emits the end of a
/// multidimensional loop which iterates over the given array section.
void EmitArrayIterationEnd();
};
/// ArrayOperationEmitter - Emits the array expression for the current
/// iteration of the multidimensional array loop.
class ArrayOperationEmitter : public ConstExprVisitor<ArrayOperationEmitter, RValueTy> {
CodeGenFunction &CGF;
CGBuilderTy &Builder;
ArrayOperation &Operation;
ArrayLoopEmitter &Looper;
public:
ArrayOperationEmitter(CodeGenFunction &cgf, ArrayOperation &Op,
ArrayLoopEmitter &Loop);
RValueTy Emit(const Expr *E);
RValueTy VisitVarExpr(const VarExpr *E);
RValueTy VisitImplicitCastExpr(const ImplicitCastExpr *E);
RValueTy VisitUnaryExpr(const UnaryExpr *E);
RValueTy VisitBinaryExpr(const BinaryExpr *E);
RValueTy VisitArrayConstructorExpr(const ArrayConstructorExpr *E);
RValueTy VisitArraySectionExpr(const ArraySectionExpr *E);
RValueTy VisitIntrinsicCallExpr(const IntrinsicCallExpr *E);
static QualType ElementType(const Expr *E) {
return cast<ArrayType>(E->getType().getTypePtr())->getElementType();
}
LValueTy EmitLValue(const Expr *E);
};
}
} // end namespace flang
#endif
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