mirror of
https://github.com/apple/swift.git
synced 2025-12-14 20:36:38 +01:00
83 lines
2.7 KiB
C++
83 lines
2.7 KiB
C++
//===--- GenInit.cpp - IR Generation for Initialization -------------------===//
|
|
//
|
|
// This source file is part of the Swift.org open source project
|
|
//
|
|
// Copyright (c) 2014 - 2016 Apple Inc. and the Swift project authors
|
|
// Licensed under Apache License v2.0 with Runtime Library Exception
|
|
//
|
|
// See http://swift.org/LICENSE.txt for license information
|
|
// See http://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 "llvm/IR/GlobalVariable.h"
|
|
|
|
#include "Explosion.h"
|
|
#include "GenHeap.h"
|
|
#include "GenTuple.h"
|
|
#include "IRGenFunction.h"
|
|
#include "IRGenModule.h"
|
|
#include "FixedTypeInfo.h"
|
|
|
|
using namespace swift;
|
|
using namespace irgen;
|
|
|
|
/// Emit a global variable.
|
|
Address IRGenModule::emitSILGlobalVariable(SILGlobalVariable *var) {
|
|
auto &ti = getTypeInfo(var->getLoweredType());
|
|
|
|
// If the variable is empty in all resilience domains, don't actually emit it;
|
|
// just return undef.
|
|
if (ti.isKnownEmpty(ResilienceExpansion::Minimal))
|
|
return ti.getUndefAddress();
|
|
|
|
/// Get the global variable.
|
|
Address addr = getAddrOfSILGlobalVariable(var, ti,
|
|
var->isDefinition() ? ForDefinition : NotForDefinition);
|
|
|
|
/// Add a zero initializer.
|
|
if (var->isDefinition()) {
|
|
auto gvar = cast<llvm::GlobalVariable>(addr.getAddress());
|
|
gvar->setInitializer(llvm::Constant::getNullValue(gvar->getValueType()));
|
|
}
|
|
|
|
return addr;
|
|
}
|
|
|
|
ContainedAddress 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, addr };
|
|
}
|
|
|
|
Address alloca =
|
|
IGF.createAlloca(getStorageType(), getFixedAlignment(), name);
|
|
IGF.Builder.CreateLifetimeStart(alloca, getFixedSize());
|
|
|
|
return { alloca, alloca };
|
|
}
|
|
|
|
void FixedTypeInfo::destroyStack(IRGenFunction &IGF, Address addr,
|
|
SILType T) const {
|
|
destroy(IGF, addr, T);
|
|
FixedTypeInfo::deallocateStack(IGF, addr, T);
|
|
}
|
|
|
|
void FixedTypeInfo::deallocateStack(IRGenFunction &IGF, Address addr,
|
|
SILType T) const {
|
|
if (isKnownEmpty(ResilienceExpansion::Maximal))
|
|
return;
|
|
IGF.Builder.CreateLifetimeEnd(addr, getFixedSize());
|
|
}
|