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//===--- GenInit.cpp - IR Generation for Initialization -------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2017 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See https://swift.org/LICENSE.txt for license information
// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//
//
// This file implements IR generation for the initialization of
// local and global variables.
//
//
//===----------------------------------------------------------------------===//
#include "swift/AST/Pattern.h"
#include "swift/SIL/SILDeclRef.h"
#include "swift/SIL/SILGlobalVariable.h"
#include "swift/IRGen/Linking.h"
#include "llvm/IR/GlobalVariable.h"
#include "llvm/IR/Module.h"
#include "DebugTypeInfo.h"
#include "GenTuple.h"
#include "IRGenDebugInfo.h"
#include "IRGenFunction.h"
#include "IRGenModule.h"
#include "FixedTypeInfo.h"
#include "Temporary.h"
using namespace swift;
using namespace irgen;
/// Emit a global variable.
void IRGenModule::emitSILGlobalVariable(SILGlobalVariable *var) {
auto &ti = getTypeInfo(var->getLoweredType());
auto expansion = getResilienceExpansionForLayout(var);
// If the variable is empty in all resilience domains that can access this
// variable directly, don't actually emit it; just return undef.
if (ti.isKnownEmpty(expansion)) {
if (DebugInfo && var->getDecl()) {
auto DbgTy = DebugTypeInfo::getGlobal(var, Int8Ty, *this);
DebugInfo->emitGlobalVariableDeclaration(nullptr, var->getDecl()->getName().str(),
"", DbgTy,
var->getLinkage() != SILLinkage::Public &&
var->getLinkage() != SILLinkage::Package,
SILLocation(var->getDecl()));
}
return;
}
/// Create the global variable.
getAddrOfSILGlobalVariable(var, ti,
var->isDefinition() ? ForDefinition : NotForDefinition);
}
StackAddress FixedTypeInfo::allocateStack(IRGenFunction &IGF, SILType T,
const Twine &name) const {
// If the type is known to be empty, don't actually allocate anything.
if (isKnownEmpty(ResilienceExpansion::Maximal)) {
auto addr = getUndefAddress();
return { addr };
}
Address alloca =
IGF.createAlloca(getStorageType(), getFixedAlignment(), name);
IGF.Builder.CreateLifetimeStart(alloca, getFixedSize());
return { alloca };
}
StackAddress FixedTypeInfo::allocateVector(IRGenFunction &IGF, SILType T,
llvm::Value *capacity,
const Twine &name) const {
// If the type is known to be empty, don't actually allocate anything.
if (isKnownEmpty(ResilienceExpansion::Maximal)) {
auto addr = getUndefAddress();
return { addr };
}
StackAddress alloca =
IGF.emitDynamicAlloca(getStorageType(), capacity, getFixedAlignment(),
/*allowTaskAlloc*/ true, name);
IGF.Builder.CreateLifetimeStart(alloca.getAddress(), getFixedSize());
return { alloca };
}
void FixedTypeInfo::destroyStack(IRGenFunction &IGF, StackAddress addr,
SILType T, bool isOutlined) const {
destroy(IGF, addr.getAddress(), T, isOutlined);
FixedTypeInfo::deallocateStack(IGF, addr, T);
}
void FixedTypeInfo::deallocateStack(IRGenFunction &IGF, StackAddress addr,
SILType T) const {
if (isKnownEmpty(ResilienceExpansion::Maximal))
return;
IGF.Builder.CreateLifetimeEnd(addr.getAddress(), getFixedSize());
}
void TemporarySet::destroyAll(IRGenFunction &IGF) const {
assert(!hasBeenCleared() && "destroying a set that's been cleared?");
// Deallocate all the temporaries.
for (auto &temporary : llvm::reverse(Stack)) {
temporary.destroy(IGF);
}
}
void Temporary::destroy(IRGenFunction &IGF) const {
auto &ti = IGF.getTypeInfo(Type);
ti.deallocateStack(IGF, Addr, Type);
}
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