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0c34b57c74
their types. - DebugTypeInfo holds all type info we need to emit debug information. - Type info is limited to name, location, and storage size. - As a side-effect: verbose LLVM IR allocas in debug builds! Swift SVN r5980
99 lines
3.1 KiB
C++
99 lines
3.1 KiB
C++
//===--- GenInit.cpp - IR Generation for Initialization -------------------===//
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//
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// This source file is part of the Swift.org open source project
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//
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// Copyright (c) 2014 - 2015 Apple Inc. and the Swift project authors
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// Licensed under Apache License v2.0 with Runtime Library Exception
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//
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// See http://swift.org/LICENSE.txt for license information
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// See http://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements IR generation for the initialization of
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// local and global variables.
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//
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//
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//===----------------------------------------------------------------------===//
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#include "swift/Basic/Optional.h"
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#include "swift/AST/Pattern.h"
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#include "llvm/IR/GlobalVariable.h"
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#include "ASTVisitor.h"
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#include "Explosion.h"
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#include "GenHeap.h"
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#include "GenTuple.h"
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#include "IRGenDebugInfo.h"
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#include "IRGenFunction.h"
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#include "IRGenModule.h"
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#include "FixedTypeInfo.h"
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using namespace swift;
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using namespace irgen;
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/// Emit a global variable.
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Address IRGenModule::emitGlobalVariable(VarDecl *var,
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const TypeInfo &type) {
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// If the variable is empty, don't actually emit it; just return undef.
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// FIXME: global destructors?
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if (type.isKnownEmpty()) {
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return type.getUndefAddress();
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}
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/// Get the global variable.
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Address addr = getAddrOfGlobalVariable(var);
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// Add a zero-initializer.
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llvm::GlobalVariable *gvar = cast<llvm::GlobalVariable>(addr.getAddress());
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gvar->setInitializer(llvm::Constant::getNullValue(type.getStorageType()));
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return addr;
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}
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/// Create an allocation for an empty object.
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static OwnedAddress createEmptyAlloca(IRGenModule &IGM, const TypeInfo &type) {
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return OwnedAddress(type.getUndefAddress(), IGM.RefCountedNull);
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}
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/// Allocate an object with fixed layout.
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OwnedAddress FixedTypeInfo::allocate(IRGenFunction &IGF, OnHeap_t onHeap,
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const Twine &name) const {
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// If the type is known to be empty, don't actually allocate anything.
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if (isKnownEmpty())
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return createEmptyAlloca(IGF.IGM, *this);
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// If the object does not need to be allocated on the heap,
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// allocate it on the stack.
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if (!onHeap) {
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Address rawAddr =
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IGF.createAlloca(getStorageType(), getFixedAlignment(), name);
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// TODO: lifetime intrinsics?
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OwnedAddress addr(rawAddr, IGF.IGM.RefCountedNull);
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return addr;
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}
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// Lay out the type as a heap object.
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HeapLayout layout(IGF.IGM, LayoutStrategy::Optimal, this);
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assert(!layout.isKnownEmpty() && "non-empty type had empty layout?");
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auto &elt = layout.getElements()[0];
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// Allocate a new object.
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// TODO: lifetime intrinsics?
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llvm::Value *allocation = IGF.emitUnmanagedAlloc(layout, name + ".alloc");
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// FIXME: provide non-fixed offsets
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NonFixedOffsets offsets = Nothing;
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// Cast and GEP down to the element.
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Address rawAddr = layout.emitCastTo(IGF, allocation);
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rawAddr = elt.project(IGF, rawAddr, offsets, name);
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OwnedAddress addr(rawAddr, allocation);
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return addr;
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}
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