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swift-mirror/lib/ClangImporter/IAMInference.cpp
Bob Wilson 8e330ee344 NFC: Fix indentation around the newly renamed LLVM_DEBUG macro. 
Jordan used a sed command to rename DEBUG to LLVM_DEBUG. That caused some
lines to wrap and messed up indentiation for multi-line arguments.
2018-07-21 00:56:18 -07:00

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//===--- IAMInference.cpp - Import as member inference system -------------===//
//
// 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 support for inferring when globals can be imported as
// members
//
//===----------------------------------------------------------------------===//
#include "CFTypeInfo.h"
#include "IAMInference.h"
#include "ImporterImpl.h"
#include "swift/AST/ASTContext.h"
#include "swift/Basic/StringExtras.h"
#include "clang/AST/ASTContext.h"
#include "clang/AST/Decl.h"
#include "clang/Lex/Preprocessor.h"
#include "clang/Sema/Sema.h"
#include "clang/Sema/Lookup.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/Support/Debug.h"
#include <array>
#include <tuple>
#define DEBUG_TYPE "Infer import as member"
// Statistics for failure to infer
STATISTIC(FailInferVar, "# of variables unable to infer");
STATISTIC(FailInferFunction, "# of functions unable to infer");
// Specifically skipped/avoided
STATISTIC(SkipLeadingUnderscore,
"# of globals skipped due to leading underscore");
STATISTIC(SkipCFMemoryManagement,
"# of CF memory management globals skipped");
// Success statistics
STATISTIC(SuccessImportAsTypeID, "# imported as 'typeID'");
STATISTIC(SuccessImportAsConstructor, "# imported as 'init'");
STATISTIC(SuccessImportAsInstanceComputedProperty,
"# imported as instance computed property");
STATISTIC(SuccessImportAsStaticProperty,
"# imported as static (stored) property");
STATISTIC(SuccessImportAsStaticComputedProperty,
"# imported as static computed property");
STATISTIC(SuccessImportAsStaticMethod, "# imported as static method");
STATISTIC(SuccessImportAsInstanceMethod, "# imported as instance method");
// Statistics for why we couldn't infer in more specific ways, and fell back to
// methods
STATISTIC(InvalidPropertyStaticNumParams,
"couldn't infer as static property: invalid number of parameters");
STATISTIC(InvalidPropertyInstanceNumParams,
"couldn't infer as instance property: invalid number of parameters");
STATISTIC(InvalidPropertyStaticGetterSetterType,
"couldn't infer as static property: getter/setter type mismatch");
STATISTIC(InvalidPropertyInstanceGetterSetterType,
"couldn't infer as instance property: getter/setter type mismatch");
STATISTIC(InvalidPropertyInstanceNoSelf,
"couldn't infer as instance property: couldn't find self");
// Omit needless words stats
STATISTIC(OmitNumTimes,
"# of times omitNeedlessWords was able to fire on an API");
using namespace swift;
using namespace importer;
using NameBuffer = SmallString<32>;
static const std::array<StringRef, 2> InitSpecifiers{{
StringRef("Create"), StringRef("Make"),
}};
static const std::array<StringRef, 2> PropertySpecifiers{{
StringRef("Get"), StringRef("Set"),
}};
IAMOptions IAMOptions::getDefault() { return {}; }
// As append, but skip a repeated word at the boundary. First-letter-case
// insensitive.
// Example: appendUniq("FooBar", "barBaz") ==> "FooBarBaz"
static void appendUniq(NameBuffer &src, StringRef toAppend) {
if (src.empty()) {
src = toAppend;
return;
}
auto appendWords = camel_case::getWords(toAppend);
StringRef lastWord = *camel_case::getWords(src).rbegin();
auto wI = appendWords.begin();
while (wI != appendWords.end() && wI->equals_lower(lastWord))
++wI;
src.append(wI.getRestOfStr());
}
static StringRef skipLeadingUnderscores(StringRef str) {
while (!str.empty() && str.startswith("_"))
str = str.drop_front(1);
return str;
}
// Form a humble camel name from a string. Skips leading underscores.
static void formHumbleCamelName(StringRef str, NameBuffer &out) {
str = skipLeadingUnderscores(str);
auto newStr = camel_case::toLowercaseInitialisms(str, out);
if (newStr == str)
out = newStr;
}
// Form a humble camel by appending the two strings and adjusting case as
// needed. Skips leading underscores in either name, and skips a repeated word
// at the boundary. Example: formHumbleCamelName("__FooBar", "barBaz") ==>
// "fooBarBaz".
static void formHumbleCamelName(StringRef left, StringRef right,
NameBuffer &out) {
left = skipLeadingUnderscores(left);
if (left == "") {
formHumbleCamelName(right, out);
return;
}
right = skipLeadingUnderscores(right);
if (right == "") {
formHumbleCamelName(left, out);
return;
}
StringRef lastWord = *camel_case::getWords(left).rbegin();
auto rightWords = camel_case::getWords(right);
auto wI = rightWords.begin();
while (wI != rightWords.end() && wI->equals_lower(lastWord))
++wI;
formHumbleCamelName(left, out);
camel_case::appendSentenceCase(out, wI.getRestOfStr());
}
static bool hasWord(StringRef s, StringRef matchWord) {
for (auto word : camel_case::getWords(s))
if (word == matchWord)
return true;
return false;
}
// Drops the specified word, and returns the number of times it was dropped.
// When forming the resultant string, will call appendUniq to skip repeated
// words at the boundary.
static unsigned dropWordUniq(StringRef str, StringRef word, NameBuffer &out) {
unsigned numDropped = 0;
auto words = camel_case::getWords(str);
for (auto wI = words.begin(), wE = words.end(); wI != wE; ++wI)
if (*wI == word)
++numDropped;
else
appendUniq(out, *wI);
return numDropped;
}
static clang::Module *getSubmodule(const clang::NamedDecl *decl, clang::Sema &clangSema) {
if (auto m = decl->getImportedOwningModule())
return m;
if (auto m = decl->getLocalOwningModule())
return m;
if (auto m = clangSema.getPreprocessor().getCurrentModule())
return m;
if (auto m = clangSema.getPreprocessor().getCurrentLexerSubmodule())
return m;
return nullptr;
}
static clang::Module *getTopModule(clang::Module *m) {
while (m->Parent)
m = m->Parent;
return m;
}
static clang::Module *getTopModule(const clang::NamedDecl *decl, clang::Sema &clangSema) {
auto m = getSubmodule(decl, clangSema);
if (!m)
return nullptr;
return getTopModule(m);
}
namespace {
class IAMInference {
ASTContext &context;
clang::Sema &clangSema;
IAMOptions options;
public:
IAMInference(ASTContext &ctx, clang::Sema &sema, IAMOptions opts)
: context(ctx), clangSema(sema), options(opts) {
(void)options;
}
IAMResult infer(const clang::NamedDecl *);
IAMResult inferVar(const clang::VarDecl *);
private:
// typeID
IAMResult importAsTypeID(const clang::QualType typeIDTy,
EffectiveClangContext effectiveDC) {
++SuccessImportAsTypeID;
return {formDeclName("typeID", /*isInitializer=*/false),
IAMAccessorKind::Getter, effectiveDC};
}
// Init
IAMResult importAsConstructor(StringRef name, StringRef initSpecifier,
ArrayRef<const clang::ParmVarDecl *> params,
EffectiveClangContext effectiveDC) {
++SuccessImportAsConstructor;
NameBuffer buf;
StringRef prefix = buf;
if (name != initSpecifier) {
assert(name.size() > initSpecifier.size() &&
"should have more words in it");
bool didDrop = dropWordUniq(name, initSpecifier, buf);
(void)didDrop;
prefix = buf;
// Skip "with"
auto prefixWords = camel_case::getWords(prefix);
if (prefixWords.begin() != prefixWords.end() &&
(*prefixWords.begin() == "With" || *prefixWords.begin() == "with")) {
prefix = prefix.drop_front(4);
}
// Skip "CF" or "NS"
prefixWords = camel_case::getWords(prefix);
if (prefixWords.begin() != prefixWords.end() &&
(*prefixWords.begin() == "CF" || *prefixWords.begin() == "NS")) {
prefix = prefix.drop_front(2);
}
assert(didDrop != 0 && "specifier not present?");
}
return {formDeclName("init", true, params, prefix), effectiveDC};
}
// Instance computed property
IAMResult
importAsInstanceProperty(StringRef name, StringRef propSpec, unsigned selfIdx,
ArrayRef<const clang::ParmVarDecl *> nonSelfParams,
const clang::FunctionDecl *pairedAccessor,
EffectiveClangContext effectiveDC) {
++SuccessImportAsInstanceComputedProperty;
IAMAccessorKind kind =
propSpec == "Get" ? IAMAccessorKind::Getter : IAMAccessorKind::Setter;
assert(kind == IAMAccessorKind::Getter || pairedAccessor && "no set-only");
return {formDeclName(name, /*isInitializer=*/false),
kind, selfIdx, effectiveDC};
}
// Instance method
IAMResult
importAsInstanceMethod(StringRef name, unsigned selfIdx,
ArrayRef<const clang::ParmVarDecl *> nonSelfParams,
EffectiveClangContext effectiveDC) {
++SuccessImportAsInstanceMethod;
return {formDeclName(name, /*isInitializer=*/false, nonSelfParams),
selfIdx, effectiveDC};
}
// Static stored property
IAMResult importAsStaticProperty(StringRef name,
EffectiveClangContext effectiveDC) {
++SuccessImportAsStaticProperty;
return {formDeclName(name, /*isInitializer=*/false), effectiveDC};
}
// Static computed property
IAMResult
importAsStaticProperty(StringRef name, StringRef propSpec,
ArrayRef<const clang::ParmVarDecl *> nonSelfParams,
const clang::FunctionDecl *pairedAccessor,
EffectiveClangContext effectiveDC) {
++SuccessImportAsStaticComputedProperty;
IAMAccessorKind kind =
propSpec == "Get" ? IAMAccessorKind::Getter : IAMAccessorKind::Setter;
assert(kind == IAMAccessorKind::Getter || pairedAccessor && "no set-only");
return {formDeclName(name, /*isInitializer=*/false),
kind, effectiveDC};
}
// Static method
IAMResult
importAsStaticMethod(StringRef name,
ArrayRef<const clang::ParmVarDecl *> nonSelfParams,
EffectiveClangContext effectiveDC) {
++SuccessImportAsStaticMethod;
return {formDeclName(name, /*isInitializer=*/false, nonSelfParams),
effectiveDC};
}
Identifier getIdentifier(StringRef str) {
if (str == "")
return Identifier();
return context.getIdentifier(str);
}
template <typename DeclType>
inline DeclType *clangLookup(StringRef name,
clang::Sema::LookupNameKind kind);
clang::TypeDecl *clangLookupTypeDecl(StringRef name) {
if (auto ty = clangLookup<clang::TypedefNameDecl>(
name, clang::Sema::LookupNameKind::LookupOrdinaryName))
return ty;
return clangLookup<clang::TagDecl>(
name, clang::Sema::LookupNameKind::LookupTagName);
}
clang::FunctionDecl *clangLookupFunction(StringRef name) {
return clangLookup<clang::FunctionDecl>(
name, clang::Sema::LookupNameKind::LookupOrdinaryName);
}
EffectiveClangContext findTypeAndMatch(StringRef workingName,
NameBuffer &outStr) {
// FIXME: drop mutable...
// TODO: should we try some form of fuzzy or fuzzier matching?
// Longest-prefix matching, alternate with checking for a trailing "Ref"
// suffix and the prefix itself. We iterate from the back to the beginning.
auto words = camel_case::getWords(workingName);
for (auto rWordsIter = words.rbegin(), rWordsEnd = words.rend();
rWordsIter != rWordsEnd; ++rWordsIter) {
NameBuffer nameAttempt;
nameAttempt.append(rWordsIter.base().getPriorStr());
StringRef prefix = nameAttempt;
nameAttempt.append("Ref");
StringRef prefixWithRef = nameAttempt;
if (auto tyDecl = clangLookupTypeDecl(prefixWithRef)) {
outStr.append(workingName.drop_front(prefix.size()));
return getEffectiveDC(clang::QualType(tyDecl->getTypeForDecl(), 0));
}
if (auto tyDecl = clangLookupTypeDecl(prefix)) {
outStr.append(workingName.drop_front(prefix.size()));
return getEffectiveDC(clang::QualType(tyDecl->getTypeForDecl(), 0));
}
}
return {};
}
bool validToImportAsProperty(const clang::FunctionDecl *originalDecl,
StringRef propSpec, Optional<unsigned> selfIndex,
const clang::FunctionDecl *&pairedAccessor);
const clang::FunctionDecl *findPairedAccessor(StringRef name,
StringRef propSpec) {
NameBuffer pairName;
auto words = camel_case::getWords(name);
for (auto word : words) {
if (word == propSpec) {
if (propSpec == "Get") {
pairName.append("Set");
} else {
assert(propSpec == "Set");
pairName.append("Get");
}
} else {
pairName.append(word);
}
}
return clangLookupFunction(pairName);
}
DeclBaseName getHumbleBaseName(StringRef name, bool isInitializer) {
// Lower-camel-case the incoming name
NameBuffer buf;
formHumbleCamelName(name, buf);
if (isInitializer && buf == "init")
return DeclBaseName::createConstructor();
return getIdentifier(buf);
}
DeclName formDeclName(StringRef baseName, bool isInitializer) {
return {getHumbleBaseName(baseName, isInitializer)};
}
DeclName formDeclName(StringRef baseName, bool isInitializer,
ArrayRef<const clang::ParmVarDecl *> params,
StringRef firstPrefix = "") {
// TODO: redesign from a SmallString to a StringScratchBuffer design for all
// of this name mangling, since we have to use one for omit needless words
// anyways
if (params.empty() && firstPrefix != "") {
// We need to form an argument label, despite there being no argument
NameBuffer paramName;
formHumbleCamelName(firstPrefix, paramName);
return {context, getHumbleBaseName(baseName, isInitializer),
getIdentifier(paramName)};
}
StringScratchSpace scratch;
SmallVector<StringRef, 8> argStrs;
for (unsigned i = 0; i < params.size(); ++i) {
NameBuffer paramName;
if (i == 0 && firstPrefix != "") {
formHumbleCamelName(firstPrefix, params[i]->getName(), paramName);
} else {
// TODO: strip leading underscores
formHumbleCamelName(params[i]->getName(), paramName);
}
argStrs.push_back(scratch.copyString(paramName));
}
DeclName beforeOmit;
(void)beforeOmit;
{
SmallVector<Identifier, 8> argLabels;
for (auto str : argStrs)
argLabels.push_back(getIdentifier(str));
LLVM_DEBUG((beforeOmit = {context,
getHumbleBaseName(baseName, isInitializer),
argLabels}));
}
SmallVector<OmissionTypeName, 8> paramTypeNames;
for (auto param : params) {
paramTypeNames.push_back(getClangTypeNameForOmission(
clangSema.getASTContext(), param->getType()));
}
auto humbleBaseName = getHumbleBaseName(baseName, isInitializer);
baseName = humbleBaseName.userFacingName();
bool didOmit =
omitNeedlessWords(baseName, argStrs, "", "", "", paramTypeNames, false,
false, nullptr, scratch);
SmallVector<Identifier, 8> argLabels;
for (auto str : argStrs)
argLabels.push_back(getIdentifier(str));
DeclName ret(context,
getHumbleBaseName(baseName, isInitializer),
argLabels);
if (didOmit) {
++OmitNumTimes;
LLVM_DEBUG(llvm::dbgs() << "omission detected: " << beforeOmit << " ==> "
<< ret << "\n");
}
return ret;
}
bool matchTypeName(StringRef str, clang::QualType qt, NameBuffer &outStr);
bool match(StringRef str, StringRef toMatch, NameBuffer &outStr);
EffectiveClangContext getEffectiveDC(clang::QualType qt) {
// Read through some attributes
while (qt.getTypePtrOrNull() && isa<clang::AttributedType>(qt.getTypePtr()))
qt = qt.getSingleStepDesugaredType(clangSema.getASTContext());
// Read through typedefs until we get to a CF typedef or a non-typedef-ed
// type
while (qt.getTypePtrOrNull() && isa<clang::TypedefType>(qt.getTypePtr())) {
auto typedefType = cast<clang::TypedefType>(qt.getTypePtr());
if (auto pointeeInfo = CFPointeeInfo::classifyTypedef(
typedefType->getDecl()->getCanonicalDecl())) {
if (pointeeInfo.isRecord() || pointeeInfo.isTypedef())
return {typedefType->getDecl()->getCanonicalDecl()};
assert(pointeeInfo.isVoid() && "no other type");
return {};
}
qt = qt.getSingleStepDesugaredType(clangSema.getASTContext());
}
auto pointeeQT = qt.getTypePtr()->getPointeeType();
if (pointeeQT != clang::QualType())
// Retry on the pointee
return getEffectiveDC(pointeeQT);
if (auto tagDecl = qt.getTypePtr()->getAsTagDecl()) {
auto canon = tagDecl->getCanonicalDecl();
if (canon->getDefinition())
return {canon};
// TODO: Once the importer learns how to import un-defined structs, then
// we will be able to infer them. Until that point, we have to bail
// because ImportDecl won't be able to re-map this.
return {};
}
// Failed to find a type we can extend
return {};
}
};
} // end anonymous namespace
static StringRef getTypeName(clang::QualType qt) {
if (auto typedefTy = qt->getAs<clang::TypedefType>()) {
// Check for a CF type name (drop the "Ref")
auto cfName = getCFTypeName(typedefTy->getDecl()->getCanonicalDecl());
if (cfName != StringRef())
return cfName;
}
auto identInfo = qt.getBaseTypeIdentifier();
if (identInfo)
return identInfo->getName();
// Otherwise, no name
return {};
}
bool IAMInference::matchTypeName(StringRef str, clang::QualType qt,
NameBuffer &outStr) {
StringRef typeName = getTypeName(qt);
if (typeName == "")
return false;
// Special case: Mutable can appear in both and may screw up word order. Or,
// Mutable can occur in the type name only. Either way, we want to have the
// potential of successfully matching the type.
NameBuffer nonMutableStr;
NameBuffer nonMutableTypeName;
if (hasWord(typeName, "Mutable")) {
dropWordUniq(typeName, "Mutable", nonMutableTypeName);
typeName = nonMutableTypeName;
if (hasWord(str, "Mutable")) {
dropWordUniq(str, "Mutable", nonMutableStr);
str = nonMutableStr;
}
}
return match(str, typeName, outStr);
}
bool IAMInference::match(StringRef str, StringRef toMatch, NameBuffer &outStr) {
// TODO: let options dictate fuzzy matching...
auto strWords = camel_case::getWords(str);
auto matchWords = camel_case::getWords(toMatch);
auto strIter = strWords.begin();
auto matchIter = matchWords.begin();
// Match in order, but allowing interjected words
while (strIter != strWords.end()) {
if (matchIter == matchWords.end()) {
// We matched them all!
appendUniq(outStr, strIter.getRestOfStr());
return true;
}
if (*strIter == *matchIter) {
// It's a match!
++strIter;
++matchIter;
continue;
}
// Move on to the next one
appendUniq(outStr, *strIter);
++strIter;
}
return false;
}
// A loose type equality check that disregards all sugar, qualification, looks
// through pointers, etc.
static bool roughlyEqual(clang::QualType left, clang::QualType right) {
auto leftPointee = left->getPointeeType();
if (leftPointee != clang::QualType())
left = leftPointee;
auto rightPointee = right->getPointeeType();
if (rightPointee != clang::QualType())
right = rightPointee;
return left->getUnqualifiedDesugaredType() ==
right->getUnqualifiedDesugaredType();
}
static bool
isValidAsStaticProperty(const clang::FunctionDecl *getterDecl,
const clang::FunctionDecl *setterDecl = nullptr) {
// Getter has none, setter has one arg
if (getterDecl->getNumParams() != 0 ||
(setterDecl && setterDecl->getNumParams() != 1)) {
++InvalidPropertyStaticNumParams;
return false;
}
// Setter's arg type should be same as getter's return type
auto getterTy = getterDecl->getReturnType();
if (setterDecl &&
!roughlyEqual(getterTy, setterDecl->getParamDecl(0)->getType())) {
++InvalidPropertyStaticGetterSetterType;
return false;
}
return true;
}
static bool
isValidAsInstanceProperty(const clang::FunctionDecl *getterDecl,
const clang::FunctionDecl *setterDecl = nullptr) {
// Instance property, look beyond self
if (getterDecl->getNumParams() != 1 ||
(setterDecl && setterDecl->getNumParams() != 2)) {
++InvalidPropertyInstanceNumParams;
return false;
}
if (!setterDecl)
return true;
// Make sure they pair up
auto getterTy = getterDecl->getReturnType();
auto selfTy = getterDecl->getParamDecl(0)->getType();
clang::QualType setterTy = {};
auto setterParam0Ty = setterDecl->getParamDecl(0)->getType();
auto setterParam1Ty = setterDecl->getParamDecl(1)->getType();
if (roughlyEqual(setterParam0Ty, selfTy)) {
setterTy = setterParam1Ty;
} else if (roughlyEqual(setterParam1Ty, selfTy)) {
setterTy = setterParam0Ty;
} else {
++InvalidPropertyInstanceNoSelf;
return false;
}
if (!roughlyEqual(setterTy, getterTy)) {
++InvalidPropertyInstanceGetterSetterType;
return false;
}
return true;
}
bool IAMInference::validToImportAsProperty(
const clang::FunctionDecl *originalDecl, StringRef propSpec,
Optional<unsigned> selfIndex, const clang::FunctionDecl *&pairedAccessor) {
bool isGet = propSpec == "Get";
pairedAccessor = findPairedAccessor(originalDecl->getName(), propSpec);
if (!pairedAccessor) {
if (!isGet)
return false;
if (!selfIndex)
return isValidAsStaticProperty(originalDecl);
return isValidAsInstanceProperty(originalDecl);
}
auto getterDecl = isGet ? originalDecl : pairedAccessor;
auto setterDecl = isGet ? pairedAccessor : originalDecl;
if (getTopModule(getterDecl, clangSema) !=
getTopModule(setterDecl, clangSema)) {
// We paired up decls from two different modules, so either we still infer
// as a getter with no setter, or we cannot be a property
if (isGet) {
pairedAccessor = nullptr;
setterDecl = nullptr;
} else {
// This is set-only as far as we're concerned
return false;
}
}
if (!selfIndex)
return isValidAsStaticProperty(getterDecl, setterDecl);
return isValidAsInstanceProperty(getterDecl, setterDecl);
}
IAMResult IAMInference::inferVar(const clang::VarDecl *varDecl) {
auto fail = [varDecl]() -> IAMResult {
LLVM_DEBUG(llvm::dbgs() << "failed to infer variable: ");
LLVM_DEBUG(varDecl->print(llvm::dbgs()));
(void)varDecl;
LLVM_DEBUG(llvm::dbgs() << "\n");
++FailInferVar;
return {};
};
// Try to find a type to add this as a static property to
StringRef workingName = varDecl->getName();
if (workingName.empty())
return fail();
// Special pattern: constants of the form "kFooBarBaz", extend "FooBar" with
// property "Baz"
if (*camel_case::getWords(workingName).begin() == "k")
workingName = workingName.drop_front(1);
NameBuffer remainingName;
if (auto effectiveDC = findTypeAndMatch(workingName, remainingName))
return importAsStaticProperty(remainingName, effectiveDC);
return fail();
}
IAMResult IAMInference::infer(const clang::NamedDecl *clangDecl) {
if (clangDecl->getName().startswith("_")) {
++SkipLeadingUnderscore;
return {};
}
// Try to infer a member variable
if (auto varDecl = dyn_cast<clang::VarDecl>(clangDecl))
return inferVar(varDecl);
// Try to infer a member function
auto funcDecl = dyn_cast<clang::FunctionDecl>(clangDecl);
if (!funcDecl) {
// TODO: Do we want to collects stats here? Should it be assert?
return {};
}
auto fail = [funcDecl]() -> IAMResult {
LLVM_DEBUG(llvm::dbgs() << "failed to infer function: ");
LLVM_DEBUG(funcDecl->print(llvm::dbgs()));
(void)funcDecl;
LLVM_DEBUG(llvm::dbgs() << "\n");
++FailInferFunction;
return {};
};
// Can't really import variadics well
if (funcDecl->isVariadic())
return fail();
// FIXME: drop "Mutable"...
StringRef workingName = funcDecl->getName();
auto retTy = funcDecl->getReturnType();
unsigned numParams = funcDecl->getNumParams();
// 0) Special cases are specially handled
//
StringRef getTypeID = "GetTypeID";
StringRef cfSpecials[] = {"Release", "Retain", "Autorelease"};
// *GetTypeID
if (numParams == 0 && workingName.endswith(getTypeID)) {
NameBuffer remainingName;
if (auto effectiveDC = findTypeAndMatch(
workingName.drop_back(getTypeID.size()), remainingName)) {
// We shouldn't have anything else left in our name for typeID
if (remainingName.empty()) {
return importAsTypeID(retTy, effectiveDC);
}
}
// *Release/*Retain/*Autorelease
} else if (numParams == 1 &&
std::any_of(std::begin(cfSpecials), std::end(cfSpecials),
[workingName](StringRef suffix) {
return workingName.endswith(suffix);
})) {
if (auto type =
funcDecl->getParamDecl(0)->getType()->getAs<clang::TypedefType>()) {
if (CFPointeeInfo::classifyTypedef(type->getDecl())) {
++SkipCFMemoryManagement;
return {};
}
}
}
// 1) If we find an init specifier and our name matches the return type, we
// import as some kind of constructor
//
if (!retTy->isVoidType()) {
NameBuffer remainingName;
if (matchTypeName(workingName, retTy, remainingName))
for (auto initSpec : InitSpecifiers)
if (hasWord(remainingName, initSpec))
if (auto effectiveDC = getEffectiveDC(retTy))
return importAsConstructor(
remainingName, initSpec,
{funcDecl->param_begin(), funcDecl->param_end()}, effectiveDC);
}
// 2) If we find a likely self reference in the parameters, make an instance
// member (method or property)
//
SmallVector<const clang::ParmVarDecl *, 8> nonSelfParams;
unsigned selfIdx = 0;
for (auto paramI = funcDecl->param_begin(), paramE = funcDecl->param_end();
paramI != paramE; ++paramI, ++selfIdx) {
auto param = *paramI;
NameBuffer remainingName;
if (matchTypeName(workingName, param->getType(), remainingName)) {
auto effectiveDC = getEffectiveDC(param->getType());
if (!effectiveDC)
continue;
nonSelfParams.append(funcDecl->param_begin(), paramI);
nonSelfParams.append(++paramI, paramE);
// See if it's a property
for (auto propSpec : PropertySpecifiers) {
NameBuffer propName;
if (match(remainingName, propSpec, propName)) {
const clang::FunctionDecl *pairedAccessor;
if (validToImportAsProperty(funcDecl, propSpec, selfIdx,
pairedAccessor))
return importAsInstanceProperty(propName, propSpec, selfIdx,
nonSelfParams, pairedAccessor,
effectiveDC);
}
}
return importAsInstanceMethod(remainingName, selfIdx, nonSelfParams,
effectiveDC);
}
}
// No self, must be static
nonSelfParams = {funcDecl->param_begin(), funcDecl->param_end()};
// 3) Finally, try to find a class to put this on as a static function
NameBuffer remainingName;
if (auto effectiveDC = findTypeAndMatch(workingName, remainingName)) {
ArrayRef<const clang::ParmVarDecl *> params = {funcDecl->param_begin(),
funcDecl->param_end()};
// See if it's a property
for (auto propSpec : PropertySpecifiers) {
NameBuffer propName;
if (match(remainingName, propSpec, propName)) {
const clang::FunctionDecl *pairedAccessor;
if (validToImportAsProperty(funcDecl, propSpec, None, pairedAccessor))
return importAsStaticProperty(propName, propSpec, nonSelfParams,
pairedAccessor, effectiveDC);
}
}
StringRef methodName =
remainingName == "" ? workingName : StringRef(remainingName);
return importAsStaticMethod(methodName, nonSelfParams, effectiveDC);
}
return fail();
}
template <typename DeclType>
DeclType *IAMInference::clangLookup(StringRef name,
clang::Sema::LookupNameKind kind) {
clang::IdentifierInfo *nameII = &clangSema.getASTContext().Idents.get(name);
clang::LookupResult lookupResult(clangSema, clang::DeclarationName(nameII),
clang::SourceLocation(), kind);
if (!clangSema.LookupName(lookupResult, clangSema.TUScope))
return nullptr;
auto res = lookupResult.getAsSingle<DeclType>();
if (!res)
return nullptr;
return res->getCanonicalDecl();
}
IAMResult IAMResult::infer(ASTContext &ctx, clang::Sema &clangSema,
const clang::NamedDecl *decl, IAMOptions opts) {
IAMInference inference(ctx, clangSema, opts);
return inference.infer(decl);
}
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