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//===--- CGDecl.cpp - Emit LLVM Code for declarations ---------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This contains code to emit Decl nodes as LLVM code.
//
//===----------------------------------------------------------------------===//
#include "CodeGenFunction.h"
#include "CodeGenModule.h"
#include "flang/AST/Decl.h"
#include "flang/AST/DeclVisitor.h"
#include "flang/AST/Expr.h"
#include "flang/AST/StorageSet.h"
namespace flang {
namespace CodeGen {
class FuncDeclEmitter : public ConstDeclVisitor<FuncDeclEmitter> {
CodeGenFunction &CGF;
public:
FuncDeclEmitter(CodeGenFunction &cgf) : CGF(cgf) {}
void VisitVarDecl(const VarDecl *D) {
CGF.EmitVarDecl(D);
}
};
void CodeGenFunction::EmitFunctionDecls(const DeclContext *DC) {
FuncDeclEmitter DV(*this);
DV.Visit(DC);
}
void CodeGenFunction::EmitVarDecl(const VarDecl *D) {
if(D->isParameter() ||
D->isArgument() ||
D->isFunctionResult()) return;
if(D->hasStorageSet()) {
if(auto E = dyn_cast<EquivalenceSet>(D->getStorageSet())) {
auto Set = EmitEquivalenceSet(E);
auto Ptr = EmitEquivalenceSetObject(Set, D);
LocalVariables.insert(std::make_pair(D, Ptr));
} else if(auto CB = dyn_cast<CommonBlockSet>(D->getStorageSet()))
EmitCommonBlock(CB);
else
llvm_unreachable("invalid storage set");
return;
}
llvm::Value *Ptr;
auto Type = D->getType();
if(Type.hasAttributeSpec(Qualifiers::AS_save) && !IsMainProgram) {
Ptr = CGM.EmitGlobalVariable(CurFn->getName(), D);
HasSavedVariables = true;
} else {
if(Type->isArrayType())
Ptr = CreateArrayAlloca(Type, D->getName());
else Ptr = Builder.CreateAlloca(ConvertTypeForMem(Type),
nullptr, D->getName());
}
LocalVariables.insert(std::make_pair(D, Ptr));
}
class VarInitEmitter : public ConstDeclVisitor<VarInitEmitter> {
CodeGenFunction &CGF;
bool VisitSaveQualified;
public:
VarInitEmitter(CodeGenFunction &cgf, bool VisitSave = false)
: CGF(cgf), VisitSaveQualified(VisitSave) {}
void VisitVarDecl(const VarDecl *D) {
if(D->isParameter() || D->isArgument() ||
D->isFunctionResult())
return;
bool HasSave = D->getType().hasAttributeSpec(Qualifiers::AS_save);
if(HasSave != VisitSaveQualified)
return;
if(D->hasInit())
CGF.EmitVarInitializer(D);
}
};
void CodeGenFunction::EmitVarInitializers(const DeclContext *DC) {
VarInitEmitter DV(*this, false);
DV.Visit(DC);
}
void CodeGenFunction::EmitSavedVarInitializers(const DeclContext *DC) {
VarInitEmitter DV(*this, true);
DV.Visit(DC);
}
void CodeGenFunction::EmitVarInitializer(const VarDecl *D) {
assert(D->hasInit());
auto T = D->getType();
if(T->isArrayType()) {
auto Dest = Builder.CreateConstInBoundsGEP2_32(GetVarPtr(D), 0, 0);
auto Init = cast<ArrayConstructorExpr>(D->getInit())->getItems();
for(size_t I = 0; I < Init.size(); ++I) {
auto Val = EmitRValue(Init[I]);
EmitStoreCharSameLength(Val, Builder.CreateConstInBoundsGEP1_64(Dest, I), T.getSelfOrArrayElementType());
}
return;
}
auto Val = EmitRValue(D->getInit());
EmitStoreCharSameLength(Val, GetVarPtr(D), D->getType());
}
// FIXME: support substrings.
std::pair<int64_t, int64_t> CodeGenFunction::GetObjectBounds(const VarDecl *Var, const Expr *E) {
auto Size = CGM.getDataLayout().getTypeStoreSize(ConvertTypeForMem(Var->getType()));
uint64_t Offset = 0;
if(auto Arr = dyn_cast<ArrayElementExpr>(E)) {
Arr->EvaluateOffset(getContext(), Offset);
Offset = Offset * CGM.getDataLayout().getTypeStoreSize(ConvertTypeForMem(E->getType()));
} else
Offset = 0;
return std::make_pair(-int64_t(Offset), -int64_t(Offset) + int64_t(Size));
}
CodeGenFunction::EquivSet CodeGenFunction::EmitEquivalenceSet(const EquivalenceSet *S) {
auto Result = EquivSets.find(S);
if(Result != EquivSets.end())
return Result->second;
// Find the bounds of the set
int64_t LowestBound = 0;
int64_t HighestBound = 0;
for(auto I : S->getObjects()) {
auto Bounds = GetObjectBounds(I.Var, I.E);
LowestBound = std::min(Bounds.first, LowestBound);
HighestBound = std::max(Bounds.second, HighestBound);
LocalVariablesInEquivSets.insert(std::make_pair(I.Var, Bounds.first));
}
EquivSet Set;
// FIXME: more accurate alignment?
Set.Ptr= Builder.Insert(new llvm::AllocaInst(CGM.Int8Ty,
llvm::ConstantInt::get(CGM.SizeTy, HighestBound - LowestBound),
CGM.getDataLayout().getTypeStoreSize(CGM.DoubleTy)),
"equivalence-set");
Set.LowestBound = LowestBound;
EquivSets.insert(std::make_pair(S, Set));
return Set;
}
llvm::Value *CodeGenFunction::EmitEquivalenceSetObject(EquivSet Set, const VarDecl *Var) {
// Compute the pointer to the object.
auto ObjLowBound = LocalVariablesInEquivSets.find(Var)->second;
auto Ptr = Builder.CreateConstInBoundsGEP1_64(Set.Ptr,
uint64_t(ObjLowBound - Set.LowestBound));
auto T = Var->getType();
return Builder.CreatePointerCast(Ptr, llvm::PointerType::get(ConvertTypeForMem(T), 0));
}
void CodeGenFunction::EmitCommonBlock(const CommonBlockSet *S) {
auto Result = CommonBlocks.find(S);
if(Result != CommonBlocks.end())
return;
SmallVector<llvm::Type*, 32> Items;
for(auto Obj : S->getObjects()) {
if(Obj.Var)
Items.push_back(ConvertTypeForMem(Obj.Var->getType()));
}
auto CBType = llvm::StructType::get(CGM.getLLVMContext(), Items);
auto Ptr = Builder.CreateBitCast(CGM.EmitCommonBlock(S->getDecl(), CBType),
llvm::PointerType::get(CBType, 0));
CommonBlocks.insert(std::make_pair(S, Ptr));
unsigned Idx = 0;
for(auto Obj : S->getObjects()) {
if(Obj.Var) {
LocalVariables.insert(std::make_pair(Obj.Var,
Builder.CreateStructGEP(Ptr, Idx)));
}
++Idx;
}
}
}
}
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