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APIDiffMigratorPass.cpp
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//===--- APIDiffMigratorPass.cpp ------------------------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
#include "swift/AST/USRGeneration.h"
#include "swift/AST/ASTVisitor.h"
#include "swift/Basic/StringExtras.h"
#include "swift/Frontend/Frontend.h"
#include "swift/IDE/Utils.h"
#include "swift/Sema/IDETypeChecking.h"
#include "swift/Migrator/ASTMigratorPass.h"
#include "swift/Migrator/EditorAdapter.h"
#include "swift/Migrator/FixitApplyDiagnosticConsumer.h"
#include "swift/Migrator/Migrator.h"
#include "swift/Migrator/RewriteBufferEditsReceiver.h"
#include "clang/Basic/Diagnostic.h"
#include "clang/Basic/FileManager.h"
#include "clang/Basic/SourceManager.h"
#include "clang/Edit/EditedSource.h"
#include "clang/Rewrite/Core/RewriteBuffer.h"
#include "llvm/Support/FileSystem.h"
#include "swift/IDE/APIDigesterData.h"
#include "swift/Basic/Defer.h"
using namespace swift;
using namespace swift::migrator;
using namespace swift::ide;
using namespace swift::ide::api;
namespace {
struct FoundResult {
SourceRange TokenRange;
bool Optional; // Range includes a trailing ? or !, e.g. [SomeType!]
bool Suffixable; // No need to wrap parens when adding optionality
bool Suffixed; // Range is followed by a trailing ? or !, e.g. [SomeType]!
bool isValid() const { return TokenRange.isValid(); }
};
class ChildIndexFinder : public TypeReprVisitor<ChildIndexFinder, FoundResult> {
ArrayRef<uint8_t> ChildIndices;
bool ParentIsOptional;
bool IsFunctionTypeArgument;
public:
ChildIndexFinder(ArrayRef<uint8_t> ChildIndices)
: ChildIndices(ChildIndices), ParentIsOptional(false),
IsFunctionTypeArgument(false) {}
FoundResult findChild(AbstractFunctionDecl *Parent) {
auto NextIndex = consumeNext();
if (!NextIndex) {
if (auto Func = dyn_cast<FuncDecl>(Parent)) {
if (auto *const TyRepr = Func->getResultTypeRepr())
return visit(TyRepr);
} else if (auto Init = dyn_cast<ConstructorDecl>(Parent)) {
SourceLoc End = Init->getFailabilityLoc();
bool Optional = End.isValid();
if (!Optional)
End = Init->getNameLoc();
return {SourceRange(Init->getNameLoc(), End), Optional,
/*suffixable=*/true, /*suffixed=*/false};
}
return {SourceRange(), false, false, false};
}
for (auto *Param: *Parent->getParameters()) {
if (!--NextIndex) {
return visit(Param->getTypeRepr());
}
}
llvm_unreachable("child index out of bounds");
}
private:
bool hasNextIndex() const {
return !ChildIndices.empty();
}
unsigned consumeNext() {
unsigned Next = ChildIndices.front();
ChildIndices = ChildIndices.drop_front();
return Next;
}
bool isUserTypeAlias(TypeRepr *T) const {
if (auto *DeclRefTR = dyn_cast<DeclRefTypeRepr>(T)) {
if (auto *Bound = DeclRefTR->getBoundDecl()) {
return isa<TypeAliasDecl>(Bound) &&
!Bound->getModuleContext()->isSystemModule();
}
}
return false;
}
public:
template<typename T>
FoundResult handleParent(TypeRepr *Parent, const ArrayRef<T> Children,
bool Optional = false, bool Suffixable = true) {
if (!hasNextIndex())
return {
Parent->getSourceRange(),
Optional, Suffixable, /*Suffixed=*/ParentIsOptional
};
auto NextIndex = consumeNext();
if (isUserTypeAlias(Parent))
return {SourceRange(), false, false, false};
assert(NextIndex < Children.size());
TypeRepr *Child = Children[NextIndex];
ParentIsOptional = Optional;
IsFunctionTypeArgument = NextIndex == 1 && isa<FunctionTypeRepr>(Parent);
return visit(Child);
}
FoundResult handleParent(TypeRepr *Parent, TypeRepr *FirstChild,
TypeRepr *SecondChild, bool Optional = false,
bool Suffixable = true) {
TypeRepr *Children[] = {FirstChild, SecondChild};
return handleParent(Parent, llvm::ArrayRef(Children), Optional, Suffixable);
}
FoundResult handleParent(TypeRepr *Parent, TypeRepr *Base,
bool Optional = false, bool Suffixable = true) {
return handleParent(Parent, llvm::ArrayRef(Base), Optional, Suffixable);
}
FoundResult visitTypeRepr(TypeRepr *T) {
llvm_unreachable("unexpected typerepr");
}
FoundResult visitErrorTypeRepr(ErrorTypeRepr *T) {
return {SourceRange(), false, false, false};
}
FoundResult visitAttributedTypeRepr(AttributedTypeRepr *T) {
return visit(T->getTypeRepr());
}
FoundResult visitOwnershipTypeRepr(OwnershipTypeRepr *T) {
return visit(T->getBase());
}
FoundResult visitIsolatedTypeRepr(IsolatedTypeRepr *T) {
return visit(T->getBase());
}
FoundResult visitTransferringTypeRepr(TransferringTypeRepr *T) {
return visit(T->getBase());
}
FoundResult visitArrayTypeRepr(ArrayTypeRepr *T) {
return handleParent(T, T->getBase());
}
FoundResult visitDictionaryTypeRepr(DictionaryTypeRepr *T) {
return handleParent(T, T->getKey(), T->getValue());
}
FoundResult visitTupleTypeRepr(TupleTypeRepr *T) {
// Paren TupleTypeReprs may be arbitrarily nested so don't count as their
// own index level except in the case of function type argument parens
if (T->isParenType() && !IsFunctionTypeArgument) {
ParentIsOptional = false;
return visit(T->getElementType(0));
}
IsFunctionTypeArgument = false;
llvm::SmallVector<TypeRepr *, 8> Children;
T->getElementTypes(Children);
return handleParent(T, ArrayRef<TypeRepr *>(Children));
}
FoundResult visitFunctionTypeRepr(FunctionTypeRepr *T) {
return handleParent(T, T->getResultTypeRepr(), T->getArgsTypeRepr(),
/*Optional=*/false, /*Suffixable=*/false);
}
FoundResult visitCompositionTypeRepr(CompositionTypeRepr *T) {
return handleParent(T, T->getTypes(), /*Optional=*/false,
/*Suffixable=*/false);
}
FoundResult visitDeclRefTypeRepr(DeclRefTypeRepr *T) {
return handleParent(T, T->getGenericArgs());
}
FoundResult visitOptionalTypeRepr(OptionalTypeRepr *T) {
return handleParent(T, T->getBase(), /*Optional=*/true);
}
FoundResult visitImplicitlyUnwrappedOptionalTypeRepr(ImplicitlyUnwrappedOptionalTypeRepr *T) {
return handleParent(T, T->getBase(), /*Optional=*/true);
}
FoundResult visitProtocolTypeRepr(ProtocolTypeRepr *T) {
return handleParent(T, T->getBase());
}
FoundResult visitMetatypeTypeRepr(MetatypeTypeRepr *T) {
return handleParent(T, T->getBase());
}
FoundResult visitFixedTypeRepr(FixedTypeRepr *T) {
return handleParent(T, ArrayRef<TypeRepr*>());
}
FoundResult visitSelfTypeRepr(SelfTypeRepr *T) {
return handleParent(T, ArrayRef<TypeRepr*>());
}
};
struct ConversionFunctionInfo {
Expr *ExpressionToWrap;
SmallString<256> Buffer;
unsigned FuncNameStart;
unsigned FuncNameEnd;
ConversionFunctionInfo(Expr *ExpressionToWrap):
ExpressionToWrap(ExpressionToWrap) {}
StringRef getFuncDef() const { return Buffer.str(); }
StringRef getFuncName() const {
return Buffer.substr(FuncNameStart, FuncNameEnd - FuncNameStart);
}
};
struct APIDiffMigratorPass : public ASTMigratorPass, public SourceEntityWalker {
APIDiffItemStore DiffStore;
bool isNilExpr(Expr *E) {
auto Range = E->getSourceRange();
return Range.isValid() && Lexer::getCharSourceRangeFromSourceRange(
SF->getASTContext().SourceMgr, Range).str() == "nil";
}
bool isDotMember(CharSourceRange Range) {
auto S = Range.str();
return S.startswith(".") && S.substr(1).find(".") == StringRef::npos;
}
bool isDotMember(SourceRange Range) {
return isDotMember(Lexer::getCharSourceRangeFromSourceRange(
SF->getASTContext().SourceMgr, Range));
}
bool isDotMember(Expr *E) {
auto Range = E->getSourceRange();
return Range.isValid() && isDotMember(Range);
}
std::vector<APIDiffItem*> getRelatedDiffItems(ValueDecl *VD) {
std::vector<APIDiffItem*> results;
if (!VD)
return results;
auto addDiffItems = [&](ValueDecl *VD) {
llvm::SmallString<64> Buffer;
llvm::raw_svector_ostream OS(Buffer);
if (swift::ide::printValueDeclUSR(VD, OS))
return;
auto Items = DiffStore.getDiffItems(Buffer.str());
results.insert(results.end(), Items.begin(), Items.end());
};
addDiffItems(VD);
for (auto *Overridden: collectAllOverriddenDecls(VD,
/*IncludeProtocolReqs=*/true,
/*Transitive=*/true)) {
addDiffItems(Overridden);
}
return results;
}
DeclNameViewer getFuncRename(ValueDecl *VD, llvm::SmallString<32> &Buffer,
bool &IgnoreBase) {
for (auto *Item: getRelatedDiffItems(VD)) {
if (auto *CI = dyn_cast<CommonDiffItem>(Item)) {
if (CI->isRename()) {
IgnoreBase = true;
switch(CI->NodeKind) {
case SDKNodeKind::DeclFunction:
IgnoreBase = false;
LLVM_FALLTHROUGH;
case SDKNodeKind::DeclConstructor:
return DeclNameViewer(CI->getNewName());
default:
return DeclNameViewer();
}
}
}
if (auto *MI = dyn_cast<TypeMemberDiffItem>(Item)) {
if (MI->Subkind == TypeMemberDiffItemSubKind::FuncRename) {
llvm::raw_svector_ostream OS(Buffer);
OS << MI->getNewTypeAndDot() << MI->newPrintedName;
return DeclNameViewer(OS.str());
}
}
}
return DeclNameViewer();
}
bool isSimpleReplacement(APIDiffItem *Item, bool isDotMember, std::string &Text) {
if (auto *MD = dyn_cast<TypeMemberDiffItem>(Item)) {
if (MD->Subkind == TypeMemberDiffItemSubKind::SimpleReplacement) {
bool NeedNoTypeName = isDotMember &&
MD->oldPrintedName == MD->newPrintedName;
if (NeedNoTypeName) {
Text = (llvm::Twine(MD->isNewNameGlobal() ? "" : ".") +
MD->getNewName().base()).str();
} else {
Text = (llvm::Twine(MD->getNewTypeAndDot()) +
MD->getNewName().base()).str();
}
return true;
}
}
// Simple rename.
if (auto CI = dyn_cast<CommonDiffItem>(Item)) {
if (CI->isRename() && (CI->NodeKind == SDKNodeKind::DeclVar ||
CI->NodeKind == SDKNodeKind::DeclType)) {
Text = CI->getNewName().str();
return true;
}
}
return false;
}
std::vector<ConversionFunctionInfo> HelperFuncInfo;
SourceLoc FileEndLoc;
llvm::StringSet<> OverridingRemoveNames;
/// For a given expression, check whether the type of this expression is
/// type alias type, and the type alias type is known to change to raw
/// representable type.
bool isRecognizedTypeAliasChange(Expr *E) {
if (auto Ty = E->getType()) {
if (auto *NT = dyn_cast<TypeAliasType>(Ty.getPointer())) {
for (auto Item: getRelatedDiffItems(NT->getDecl())) {
if (auto CI = dyn_cast<CommonDiffItem>(Item)) {
if (CI->DiffKind == NodeAnnotation::TypeAliasDeclToRawRepresentable) {
return true;
}
}
}
}
}
return false;
}
APIDiffMigratorPass(EditorAdapter &Editor, SourceFile *SF,
const MigratorOptions &Opts):
ASTMigratorPass(Editor, SF, Opts), DiffStore(Diags),
FileEndLoc(SM.getRangeForBuffer(BufferID).getEnd()),
OverridingRemoveNames(funcNamesForOverrideRemoval()) {}
~APIDiffMigratorPass() {
Editor.disableCache();
SWIFT_DEFER { Editor.enableCache(); };
// Collect inserted functions to avoid re-insertion.
std::set<std::string> InsertedFunctions;
SmallVector<Decl*, 16> TopDecls;
SF->getTopLevelDecls(TopDecls);
for (auto *D: TopDecls) {
if (auto *FD = dyn_cast<FuncDecl>(D)) {
InsertedFunctions.insert(
std::string(FD->getBaseIdentifier()));
}
}
// Handle helper functions without wrappees first.
for (auto &Cur: HelperFuncInfo) {
if (Cur.ExpressionToWrap)
continue;
auto FuncName = Cur.getFuncName().str();
// Avoid inserting the helper function if it's already present.
if (!InsertedFunctions.count(FuncName)) {
Editor.insert(FileEndLoc, Cur.getFuncDef());
InsertedFunctions.insert(FuncName);
}
}
// Remove all helper functions that're without expressions to wrap.
HelperFuncInfo.erase(std::remove_if(HelperFuncInfo.begin(),
HelperFuncInfo.end(), [](const ConversionFunctionInfo& Info) {
return !Info.ExpressionToWrap;
}), HelperFuncInfo.end());
for (auto &Cur: HelperFuncInfo) {
assert(Cur.ExpressionToWrap);
// Avoid wrapping nil expression.
if (isNilExpr(Cur.ExpressionToWrap))
continue;
// Avoid wrapping a single expression with multiple conversion functions.
auto count = std::count_if(HelperFuncInfo.begin(), HelperFuncInfo.end(),
[&] (ConversionFunctionInfo &Info) {
return Info.ExpressionToWrap->getSourceRange() ==
Cur.ExpressionToWrap->getSourceRange();
});
if (count > 1)
continue;
assert(count == 1);
// A conversion function will be redundant if the expression will change
// from type alias to raw-value representable.
if (isRecognizedTypeAliasChange(Cur.ExpressionToWrap))
continue;
auto FuncName = Cur.getFuncName().str();
// Avoid inserting the helper function if it's already present.
if (!InsertedFunctions.count(FuncName)) {
Editor.insert(FileEndLoc, Cur.getFuncDef());
InsertedFunctions.insert(FuncName);
}
Editor.insertBefore(Cur.ExpressionToWrap->getStartLoc(),
(Twine(FuncName) + "(").str());
Editor.insertAfterToken(Cur.ExpressionToWrap->getEndLoc(), ")");
}
}
void run() {
if (Opts.APIDigesterDataStorePaths.empty())
return;
for (auto Path : Opts.APIDigesterDataStorePaths)
DiffStore.addStorePath(Path);
DiffStore.printIncomingUsr(Opts.DumpUsr);
walk(SF);
}
bool updateStringRepresentableDeclRef(APIDiffItem *Diff,
CharSourceRange Range) {
auto *CD = dyn_cast<CommonDiffItem>(Diff);
if (!CD)
return false;
if (CD->NodeKind != SDKNodeKind::DeclVar)
return false;
if (!CD->isStringRepresentableChange())
return false;
switch(CD->DiffKind) {
case NodeAnnotation::SimpleStringRepresentableUpdate:
Editor.insert(Range.getEnd(), ".rawValue");
return true;
default:
return false;
}
}
bool visitDeclReference(ValueDecl *D, CharSourceRange Range,
TypeDecl *CtorTyRef, ExtensionDecl *ExtTyRef,
Type T, ReferenceMetaData Data) override {
if (Data.isImplicit)
return true;
for (auto *Item: getRelatedDiffItems(CtorTyRef ? CtorTyRef: D)) {
std::string RepText;
if (isSimpleReplacement(Item, isDotMember(Range), RepText)) {
Editor.replace(Range, RepText);
return true;
}
}
return true;
}
struct ReferenceCollector : public SourceEntityWalker {
ValueDecl *Target;
CharSourceRange Result;
ReferenceCollector(ValueDecl* Target) : Target(Target) {}
bool visitDeclReference(ValueDecl *D, CharSourceRange Range,
TypeDecl *CtorTyRef, ExtensionDecl *ExtTyRef,
Type T, ReferenceMetaData Data) override {
if (D == Target && !Data.isImplicit && Range.isValid()) {
Result = Range;
return false;
}
return true;
}
};
void emitRenameLabelChanges(ArgumentList *Args, DeclNameViewer NewName,
llvm::ArrayRef<unsigned> IgnoreArgIndex) {
unsigned Idx = 0;
auto Ranges = getCallArgLabelRanges(SM, Args,
LabelRangeEndAt::LabelNameOnly);
llvm::SmallVector<uint8_t, 2> ToRemoveIndices;
for (unsigned I = 0; I < Ranges.first.size(); I ++) {
if (std::any_of(IgnoreArgIndex.begin(), IgnoreArgIndex.end(),
[I](unsigned Ig) { return Ig == I; }))
continue;
// Ignore the first trailing closure label
if (Ranges.second && I == Ranges.second)
continue;
auto LR = Ranges.first[I];
if (Idx < NewName.argSize()) {
auto Label = NewName.args()[Idx++];
if (!Label.empty()) {
if (LR.getByteLength())
Editor.replace(LR, Label);
else
Editor.insert(LR.getStart(), (llvm::Twine(Label) + ": ").str());
} else if (LR.getByteLength()){
// New label is "_" however the old label is explicit.
ToRemoveIndices.push_back(I);
}
}
}
if (!ToRemoveIndices.empty()) {
auto Ranges = getCallArgLabelRanges(SM, Args,
LabelRangeEndAt::BeforeElemStart);
for (auto I : ToRemoveIndices) {
Editor.remove(Ranges.first[I]);
}
}
}
void handleFuncRename(ValueDecl *FD, Expr* FuncRefContainer,
ArgumentList *Args) {
bool IgnoreBase = false;
llvm::SmallString<32> Buffer;
if (auto View = getFuncRename(FD, Buffer, IgnoreBase)) {
if (!IgnoreBase) {
ReferenceCollector Walker(FD);
Walker.walk(FuncRefContainer);
Editor.replace(Walker.Result, View.base());
}
emitRenameLabelChanges(Args, View, {});
}
}
bool handleQualifiedReplacement(Expr* Call) {
auto handleDecl = [&](ValueDecl *VD, SourceRange ToReplace) {
for (auto *I: getRelatedDiffItems(VD)) {
if (auto *Item = dyn_cast<TypeMemberDiffItem>(I)) {
if (Item->Subkind == TypeMemberDiffItemSubKind::QualifiedReplacement) {
bool NeedNoTypeName = isDotMember(ToReplace) &&
Item->oldPrintedName == Item->newPrintedName;
if (NeedNoTypeName) {
Editor.replace(ToReplace,
(llvm::Twine(Item->isNewNameGlobal() ? "" : ".") +
Item->getNewName().base()).str());
} else {
Editor.replace(ToReplace,
(llvm::Twine(Item->getNewTypeAndDot()) +
Item->getNewName().base()).str());
}
return true;
}
}
}
return false;
};
if (auto *VD = getReferencedDecl(Call, /*semantic=*/false).second.getDecl())
if (handleDecl(VD, Call->getSourceRange()))
return true;
return false;
}
bool handleSpecialCases(ValueDecl *FD, CallExpr* Call, ArgumentList *Args) {
SpecialCaseDiffItem *Item = nullptr;
for (auto *I: getRelatedDiffItems(FD)) {
Item = dyn_cast<SpecialCaseDiffItem>(I);
if (Item)
break;
}
if (!Item)
return false;
std::vector<CallArgInfo> AllArgs =
getCallArgInfo(SM, Args, LabelRangeEndAt::LabelNameOnly);
switch(Item->caseId) {
case SpecialCaseId::NSOpenGLSetOption: {
// swift 3.2:
// NSOpenGLSetOption(NSOpenGLGOFormatCacheSize, 5)
// swift 4:
// NSOpenGLGOFormatCacheSize.globalValue = 5
CallArgInfo &FirstArg = AllArgs[0];
CallArgInfo &SecondArg = AllArgs[1];
Editor.remove(CharSourceRange(SM, Call->getStartLoc(),
FirstArg.ArgExp->getStartLoc()));
Editor.replace(CharSourceRange(SM, Lexer::getLocForEndOfToken(SM,
FirstArg.ArgExp->getEndLoc()), SecondArg.LabelRange.getStart()),
".globalValue = ");
Editor.remove(Call->getEndLoc());
return true;
}
case SpecialCaseId::NSOpenGLGetOption: {
// swift 3.2:
// NSOpenGLGetOption(NSOpenGLGOFormatCacheSize, &cacheSize)
// swift 4:
// cacheSize = NSOpenGLGOFormatCacheSize.globalValue
CallArgInfo &FirstArg = AllArgs[0];
CallArgInfo &SecondArg = AllArgs[1];
StringRef SecondArgContent = SecondArg.getEntireCharRange(SM).str();
if (SecondArgContent[0] == '&')
SecondArgContent = SecondArgContent.substr(1);
Editor.replace(CharSourceRange(SM, Call->getStartLoc(),
FirstArg.ArgExp->getStartLoc()),
(llvm::Twine(SecondArgContent) + " = ").str());
Editor.replace(CharSourceRange(SM, FirstArg.getEntireCharRange(SM).getEnd(),
Lexer::getLocForEndOfToken(SM, Call->getEndLoc())),
".globalValue");
return true;
}
case SpecialCaseId::StaticAbsToSwiftAbs:
// swift 3:
// CGFloat.abs(1.0)
// Float.abs(1.0)
// Double.abs(1.0)
// Float80.abs(1.0)
//
// swift 4:
// Swift.abs(1.0)
// Swift.abs(1.0)
// Swift.abs(1.0)
// Swift.abs(1.0)
Editor.replace(Call->getFn()->getSourceRange(), "Swift.abs");
return true;
case SpecialCaseId::ToUIntMax:
if (const auto *DotCall = dyn_cast<DotSyntaxCallExpr>(Call->getFn())) {
Editor.insert(DotCall->getStartLoc(), "UInt64(");
Editor.replace({ DotCall->getDotLoc(), Call->getEndLoc() }, ")");
return true;
}
return false;
case SpecialCaseId::ToIntMax:
if (const auto *DotCall = dyn_cast<DotSyntaxCallExpr>(Call->getFn())) {
Editor.insert(DotCall->getStartLoc(), "Int64(");
Editor.replace({ DotCall->getDotLoc(), Call->getEndLoc() }, ")");
return true;
}
return false;
case SpecialCaseId::NSOpenGLGetVersion: {
if (Args->size() != 2)
return false;
auto extractArg = [](const Expr *Arg) -> const DeclRefExpr * {
while (const auto *ICE = dyn_cast<ImplicitConversionExpr>(Arg)) {
Arg = ICE->getSubExpr();
}
if (const auto *IOE = dyn_cast<InOutExpr>(Arg)) {
return dyn_cast<DeclRefExpr>(IOE->getSubExpr());
}
return nullptr;
};
const auto *Arg0 = extractArg(Args->getExpr(0));
const auto *Arg1 = extractArg(Args->getExpr(1));
if (!(Arg0 && Arg1)) {
return false;
}
SmallString<256> Scratch;
llvm::raw_svector_ostream OS(Scratch);
auto StartLoc = Call->getStartLoc();
Editor.insert(StartLoc, "(");
Editor.insert(StartLoc,
SM.extractText(Lexer::getCharSourceRangeFromSourceRange(SM,
Arg0->getSourceRange())));
Editor.insert(StartLoc, ", ");
Editor.insert(StartLoc,
SM.extractText(Lexer::getCharSourceRangeFromSourceRange(SM,
Arg1->getSourceRange())));
Editor.insert(StartLoc, ") = ");
Editor.replace(Call->getSourceRange(), "NSOpenGLContext.openGLVersion");
return true;
}
case SpecialCaseId::UIApplicationMain: {
// If the first argument is CommandLine.argc, replace the second argument
// with CommandLine.unsafeArgv
CallArgInfo &FirstArg = AllArgs[0];
// handle whitespace/line splits around the first arg when matching
auto FirstArgSplit =
SM.extractText(FirstArg.getEntireCharRange(SM)).rsplit('.');
if (!FirstArgSplit.second.empty() &&
FirstArgSplit.first.trim() == "CommandLine" &&
FirstArgSplit.second.trim() == "argc") {
CallArgInfo &SecondArg = AllArgs[1];
Editor.replace(SecondArg.getEntireCharRange(SM),
"CommandLine.unsafeArgv");
return true;
}
return false;
}
}
llvm_unreachable("unhandled case");
}
bool handleTypeHoist(ValueDecl *FD, CallExpr* Call, ArgumentList *Args) {
TypeMemberDiffItem *Item = nullptr;
for (auto *I: getRelatedDiffItems(FD)) {
Item = dyn_cast<TypeMemberDiffItem>(I);
if (Item)
break;
}
if (!Item)
return false;
if (Item->Subkind == TypeMemberDiffItemSubKind::SimpleReplacement ||
Item->Subkind == TypeMemberDiffItemSubKind::QualifiedReplacement ||
Item->Subkind == TypeMemberDiffItemSubKind::FuncRename)
return false;
if (Item->Subkind == TypeMemberDiffItemSubKind::GlobalFuncToStaticProperty) {
Editor.replace(Call->getSourceRange(),
(llvm::Twine(Item->getNewTypeAndDot()) + Item->getNewName().base()).str());
return true;
}
if (*Item->selfIndex)
return false;
std::vector<CallArgInfo> AllArgs =
getCallArgInfo(SM, Args, LabelRangeEndAt::LabelNameOnly);
if (!AllArgs.size())
return false;
assert(*Item->selfIndex == 0 && "we cannot handle otherwise");
DeclNameViewer NewName = Item->getNewName();
llvm::SmallVector<unsigned, 2> IgnoredArgIndices;
IgnoredArgIndices.push_back(*Item->selfIndex);
if (auto RI = Item->removedIndex)
IgnoredArgIndices.push_back(*RI);
emitRenameLabelChanges(Args, NewName, IgnoredArgIndices);
auto *SelfExpr = AllArgs[0].ArgExp;
if (auto *IOE = dyn_cast<InOutExpr>(SelfExpr))
SelfExpr = IOE->getSubExpr();
const bool NeedParen = !SelfExpr->canAppendPostfixExpression();
// Remove the global function name: "Foo(a, b..." to "a, b..."
Editor.remove(CharSourceRange(SM, Call->getStartLoc(),
SelfExpr->getStartLoc()));
if (NeedParen)
Editor.insert(SelfExpr->getStartLoc(), "(");
std::string MemberFuncBase;
if (Item->Subkind == TypeMemberDiffItemSubKind::HoistSelfAndUseProperty)
MemberFuncBase = (llvm::Twine(NeedParen ? ")." : ".") + Item->getNewName().
base()).str();
else
MemberFuncBase = (llvm::Twine(NeedParen ? ")." : ".") + Item->getNewName().
base() + "(").str();
if (AllArgs.size() > 1) {
Editor.replace(CharSourceRange(SM, Lexer::getLocForEndOfToken(SM,
SelfExpr->getEndLoc()), AllArgs[1].LabelRange.getStart()),
MemberFuncBase);
} else {
Editor.insert(Lexer::getLocForEndOfToken(SM, SelfExpr->getEndLoc()),
MemberFuncBase);
}
switch (Item->Subkind) {
case TypeMemberDiffItemSubKind::FuncRename:
case TypeMemberDiffItemSubKind::GlobalFuncToStaticProperty:
case TypeMemberDiffItemSubKind::SimpleReplacement:
case TypeMemberDiffItemSubKind::QualifiedReplacement:
llvm_unreachable("should be handled elsewhere");
case TypeMemberDiffItemSubKind::HoistSelfOnly:
// we are done here.
return true;
case TypeMemberDiffItemSubKind::HoistSelfAndRemoveParam: {
unsigned RI = *Item->removedIndex;
CallArgInfo &ToRemove = AllArgs[RI];
if (AllArgs.size() == RI + 1) {
Editor.remove(ToRemove.getEntireCharRange(SM));
} else {
CallArgInfo &AfterToRemove = AllArgs[RI + 1];
Editor.remove(CharSourceRange(SM, ToRemove.LabelRange.getStart(),
AfterToRemove.LabelRange.getStart()));
}
return true;
}
case TypeMemberDiffItemSubKind::HoistSelfAndUseProperty:
// Remove ).
Editor.remove(Args->getEndLoc());
return true;
}
llvm_unreachable("unhandled subkind");
}
void handleFunctionCallToPropertyChange(ValueDecl *FD, Expr* FuncRefContainer,
ArgumentList *Args) {
for (auto *Item : getRelatedDiffItems(FD)) {
if (auto *CD = dyn_cast<CommonDiffItem>(Item)) {
switch (CD->DiffKind) {
case NodeAnnotation::GetterToProperty: {
// Remove "()"
Editor.remove(Lexer::getCharSourceRangeFromSourceRange(SM,
Args->getSourceRange()));
return;
}
case NodeAnnotation::SetterToProperty: {
ReferenceCollector Walker(FD);
Walker.walk(FuncRefContainer);
auto ReplaceRange = CharSourceRange(SM, Walker.Result.getStart(),
Args->getStartLoc().getAdvancedLoc(1));
// Replace "x.getY(" with "x.Y =".
auto Replacement = (llvm::Twine(Walker.Result.str()
.substr(3)) + " = ").str();
SmallString<64> Scratch;
Editor.replace(ReplaceRange,
camel_case::toLowercaseInitialisms(Replacement, Scratch));
// Remove ")"
Editor.remove(CharSourceRange(SM, Args->getEndLoc(),
Args->getEndLoc().getAdvancedLoc(1)));
return;
}
default:
break;
}
}
}
}
void replaceExpr(Expr* E, StringRef Text) {
Editor.replace(CharSourceRange(SM, E->getStartLoc(),
Lexer::getLocForEndOfToken(SM, E->getEndLoc())), Text);
}
bool wrapAttributeReference(Expr *Reference, Expr *WrapperTarget,
bool FromString) {
auto *RD = Reference->getReferencedDecl().getDecl();
if (!RD)
return false;
std::string Rename;
std::optional<NodeAnnotation> Kind;
StringRef LeftComment;
StringRef RightComment;
for (auto *Item: getRelatedDiffItems(RD)) {
if (isSimpleReplacement(Item, isDotMember(Reference), Rename)) {
} else if (auto *CI = dyn_cast<CommonDiffItem>(Item)) {
if (CI->isStringRepresentableChange() &&
CI->NodeKind == SDKNodeKind::DeclVar) {
Kind = CI->DiffKind;
LeftComment = CI->LeftComment;
RightComment = CI->RightComment;
}
}
}
if (!Kind.has_value())
return false;
if (Kind) {
insertHelperFunction(*Kind, LeftComment, RightComment, FromString,
WrapperTarget);
}
if (!Rename.empty()) {
replaceExpr(Reference, Rename);
}
return true;
}
bool handleAssignDestMigration(Expr *E) {
auto *ASE = dyn_cast<AssignExpr>(E);
if (!ASE || !ASE->getDest() || !ASE->getSrc())
return false;
auto *Dest = ASE->getDest();
auto Src = ASE->getSrc();
if (wrapAttributeReference(Dest, Src, true)) {
// We should handle the assignment source here since we won't visit
// the children with present changes.
handleAttributeReference(Src);
return true;
}
return false;
}
bool handleAttributeReference(Expr *E) {
return wrapAttributeReference(E, E, false);
}
ConversionFunctionInfo &insertHelperFunction(NodeAnnotation Anno,
StringRef RawType,
StringRef NewType,
bool FromString,
Expr *Wrappee) {
HelperFuncInfo.emplace_back(Wrappee);
ConversionFunctionInfo &Info = HelperFuncInfo.back();
llvm::raw_svector_ostream OS(Info.Buffer);
OS << "\n";
OS << "// Helper function inserted by Swift 4.2 migrator.\n";
OS << "fileprivate func ";
Info.FuncNameStart = Info.Buffer.size();
OS << (FromString ? "convertTo" : "convertFrom");
SmallVector<std::string, 8> Segs;
StringRef guard = "\tguard let input = input else { return nil }\n";
switch(Anno) {
case NodeAnnotation::OptionalArrayMemberUpdate:
Segs = {"Optional", "Array", (Twine("[") + RawType + "]?").str()};
Segs.push_back((Twine("[") + NewType +"]?").str());
Segs.push_back((Twine(guard) + "\treturn input.map { key in " + NewType +"(key) }").str());
Segs.push_back((Twine(guard) + "\treturn input.map { key in key.rawValue }").str());
break;
case NodeAnnotation::OptionalDictionaryKeyUpdate:
Segs = {"Optional", "Dictionary", (Twine("[") + RawType + ": Any]?").str()};
Segs.push_back((Twine("[") + NewType +": Any]?").str());
Segs.push_back((Twine(guard) +
"\treturn Dictionary(uniqueKeysWithValues: input.map"
" { key, value in (" + NewType + "(rawValue: key), value)})").str());
Segs.push_back((Twine(guard) +
"\treturn Dictionary(uniqueKeysWithValues: input.map"
" {key, value in (key.rawValue, value)})").str());
break;
case NodeAnnotation::ArrayMemberUpdate:
Segs = {"", "Array", (Twine("[") + RawType + "]").str()};
Segs.push_back((Twine("[") + NewType +"]").str());
Segs.push_back((Twine("\treturn input.map { key in ") + NewType +"(key) }").str());
Segs.push_back("\treturn input.map { key in key.rawValue }");
break;
case NodeAnnotation::DictionaryKeyUpdate:
Segs = {"", "Dictionary", (Twine("[") + RawType + ": Any]").str()};
Segs.push_back((Twine("[") + NewType +": Any]").str());
Segs.push_back((Twine("\treturn Dictionary(uniqueKeysWithValues: input.map"
" { key, value in (") + NewType + "(rawValue: key), value)})").str());
Segs.push_back("\treturn Dictionary(uniqueKeysWithValues: input.map"
" {key, value in (key.rawValue, value)})");
break;
case NodeAnnotation::SimpleStringRepresentableUpdate:
Segs = {"", "", RawType.str()};
Segs.push_back(NewType.str());
Segs.push_back((Twine("\treturn ") + NewType + "(rawValue: input)").str());
Segs.push_back("\treturn input.rawValue");
break;
case NodeAnnotation::SimpleOptionalStringRepresentableUpdate:
Segs = {"Optional", "", (Twine(RawType) +"?").str()};
Segs.push_back((Twine(NewType) +"?").str());
Segs.push_back((Twine(guard) + "\treturn " + NewType + "(rawValue: input)").str());
Segs.push_back((Twine(guard) + "\treturn input.rawValue").str());
break;
default:
llvm_unreachable("shouldn't handle this key.");
}
assert(Segs.size() == 6);
OS << Segs[0];
SmallVector<StringRef, 4> Parts;
NewType.split(Parts, '.');
for (auto P: Parts)
OS << P;
OS << Segs[1];
Info.FuncNameEnd = Info.Buffer.size();
if (FromString) {
OS << "(_ input: " << Segs[2] << ") -> " << Segs[3] << " {\n";
OS << Segs[4] << "\n}\n";
} else {
OS << "(_ input: " << Segs[3] << ") -> " << Segs[2] << " {\n";
OS << Segs[5] << "\n}\n";
}
return Info;
}
void handleStringRepresentableArg(ValueDecl *FD, ArgumentList *Args,
Expr *Call) {
NodeAnnotation Kind;
StringRef RawType;
StringRef NewAttributeType;
uint8_t ArgIdx;
for (auto Item: getRelatedDiffItems(FD)) {
if (auto *CI = dyn_cast<CommonDiffItem>(Item)) {
if (CI->isStringRepresentableChange()) {
Kind = CI->DiffKind;
RawType = CI->LeftComment;
NewAttributeType = CI->RightComment;
assert(CI->getChildIndices().size() == 1);
ArgIdx = CI->getChildIndices().front();
break;
}
}
}
if (NewAttributeType.empty())
return;
Expr *WrapTarget = Call;
bool FromString = false;
if (ArgIdx) {
ArgIdx --;
FromString = true;
auto AllArgs = getCallArgInfo(SM, Args, LabelRangeEndAt::LabelNameOnly);
if (AllArgs.size() <= ArgIdx)
return;
WrapTarget = AllArgs[ArgIdx].ArgExp;
}
assert(WrapTarget);
insertHelperFunction(Kind, RawType, NewAttributeType, FromString, WrapTarget);
}
bool hasRevertRawRepresentableChange(ValueDecl *VD) {
for (auto Item: getRelatedDiffItems(VD)) {