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CodeGenerator.h
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CodeGenerator.h
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/******************************************************************************
*
* C++ Insights, copyright (C) by Andreas Fertig
* Distributed under an MIT license. See LICENSE for details
*
****************************************************************************/
#ifndef INSIGHTS_CODE_GENERATOR_H
#define INSIGHTS_CODE_GENERATOR_H
#include "clang/AST/ASTContext.h"
#include "clang/Rewrite/Core/Rewriter.h"
#include "llvm/ADT/APInt.h"
#include <optional>
#include "ClangCompat.h"
#include "InsightsStaticStrings.h"
#include "InsightsStrongTypes.h"
#include "InsightsUtility.h"
#include "OutputFormatHelper.h"
#include "StackList.h"
//-----------------------------------------------------------------------------
namespace clang::insights {
class CppInsightsCommentStmt : public Stmt
{
std::string mComment{};
public:
CppInsightsCommentStmt(std::string_view comment)
: Stmt{NoStmtClass}
, mComment{comment}
{
}
std::string_view Comment() const { return mComment; }
static bool classof(const Stmt* T) { return T->getStmtClass() == NoStmtClass; }
child_range children()
{
static child_iterator iter{};
return {iter, iter};
}
const_child_range children() const
{
static const_child_iterator iter{};
return {iter, iter};
}
};
struct LifetimeEntry
{
STRONG_BOOL(FuncStart);
const VarDecl* item{};
FuncStart funcStart{FuncStart::No};
int scope{};
};
class LifetimeTracker
{
inline static int scopeCounter{};
SmallVector<LifetimeEntry, 10> objects{};
void InsertDtorCall(const VarDecl* decl, OutputFormatHelper& ofm);
public:
void Add(const VarDecl* decl);
LifetimeEntry& top() { return objects.back(); }
void removeTop();
void StartScope(bool funcStart);
bool Return(OutputFormatHelper& ofm);
bool EndScope(OutputFormatHelper& ofm, bool clear);
};
/// \brief More or less the heart of C++ Insights.
///
/// This is the place where nearly all of the transformations happen. This class knows the needed types and how to
/// generated code from them.
class CodeGenerator
{
protected:
LifetimeTracker mLifeTimeTracker{};
const Stmt* mLastStmt{};
const Expr* mLastExpr{}; // special case for assignments to class member
public:
const Decl* mLastDecl{};
protected:
bool mProcessingVarDecl{};
friend class CodeGeneratorVariant;
OutputFormatHelper& mOutputFormatHelper;
enum class LambdaCallerType
{
VarDecl,
InitCapture,
CallExpr,
OperatorCallExpr,
MemberCallExpr,
LambdaExpr,
ReturnStmt,
BinaryOperator,
CXXMethodDecl,
TemplateHead,
Decltype,
};
class LambdaHelper : public StackListEntry<LambdaHelper>
{
public:
LambdaHelper(const LambdaCallerType lambdaCallerType, OutputFormatHelper& outputFormatHelper)
: mLambdaCallerType{lambdaCallerType}
, mCurrentPos{outputFormatHelper.CurrentPos()}
, mOutputFormatHelper{outputFormatHelper}
{
mLambdaOutputFormatHelper.SetIndent(mOutputFormatHelper);
}
void finish()
{
if(not mLambdaOutputFormatHelper.empty()) {
mOutputFormatHelper.InsertAt(mCurrentPos, mLambdaOutputFormatHelper);
}
}
OutputFormatHelper& buffer() { return mLambdaOutputFormatHelper; }
std::string& inits() { return mInits; }
void insertInits(OutputFormatHelper& outputFormatHelper)
{
if(not mInits.empty()) {
outputFormatHelper.Append(mInits);
mInits.clear();
}
}
LambdaCallerType callerType() const { return mLambdaCallerType; }
bool insertName() const { return (LambdaCallerType::Decltype != mLambdaCallerType) or mForceName; }
void setInsertName(bool b) { mForceName = b; }
private:
const LambdaCallerType mLambdaCallerType;
const size_t mCurrentPos;
OutputFormatHelper& mOutputFormatHelper;
OutputFormatHelper mLambdaOutputFormatHelper{};
std::string mInits{};
bool mForceName{};
};
//-----------------------------------------------------------------------------
using LambdaStackType = StackList<class LambdaHelper>;
STRONG_BOOL(LambdaInInitCapture); ///! Signal whether we are processing a lambda created and assigned to an init
/// capture of another lambda.
STRONG_BOOL(
ProcessingPrimaryTemplate); ///! We do not want to transform a primary template which contains a Coroutine.
constexpr CodeGenerator(OutputFormatHelper& _outputFormatHelper,
LambdaStackType& lambdaStack,
LambdaInInitCapture lambdaInitCapture,
ProcessingPrimaryTemplate processingPrimaryTemplate)
: mOutputFormatHelper{_outputFormatHelper}
, mLambdaStack{lambdaStack}
, mLambdaInitCapture{lambdaInitCapture}
, mProcessingPrimaryTemplate{processingPrimaryTemplate}
{
}
public:
explicit constexpr CodeGenerator(OutputFormatHelper& _outputFormatHelper)
: CodeGenerator{_outputFormatHelper, mLambdaStackThis, ProcessingPrimaryTemplate::No}
{
}
constexpr CodeGenerator(OutputFormatHelper& _outputFormatHelper, LambdaInInitCapture lambdaInitCapture)
: CodeGenerator{_outputFormatHelper, mLambdaStackThis, lambdaInitCapture, ProcessingPrimaryTemplate::No}
{
}
constexpr CodeGenerator(OutputFormatHelper& _outputFormatHelper,
LambdaStackType& lambdaStack,
ProcessingPrimaryTemplate processingPrimaryTemplate)
: CodeGenerator{_outputFormatHelper, lambdaStack, LambdaInInitCapture::No, processingPrimaryTemplate}
{
}
virtual ~CodeGenerator() = default;
#define IGNORED_DECL(type) \
virtual void InsertArg(const type*) {}
#define IGNORED_STMT(type) \
virtual void InsertArg(const type*) {}
#define SUPPORTED_DECL(type) virtual void InsertArg(const type* stmt);
#define SUPPORTED_STMT(type) virtual void InsertArg(const type* stmt);
#include "CodeGeneratorTypes.h"
virtual void InsertArg(const Decl* stmt);
virtual void InsertArg(const Stmt* stmt);
template<typename T>
void InsertTemplateArgs(const T& t)
{
if constexpr(std::is_same_v<T, FunctionDecl>) {
if(const auto* tmplArgs = t.getTemplateSpecializationArgs()) {
InsertTemplateArgs(*tmplArgs);
}
} else if constexpr(std::is_same_v<T, VarTemplateSpecializationDecl>) {
InsertTemplateArgs(t.getTemplateArgs());
} else if constexpr(requires { t.template_arguments(); }) {
if constexpr(std::is_same_v<DeclRefExpr, T>) {
if(0 == t.getNumTemplateArgs()) {
return;
}
}
InsertTemplateArgs(t.template_arguments());
} else if constexpr(requires { t.asArray(); }) {
InsertTemplateArgs(t.asArray());
}
}
void InsertTemplateArgs(const ClassTemplateSpecializationDecl& clsTemplateSpe);
/// \brief Insert the code for a FunctionDecl.
///
/// This inserts the code of a FunctionDecl (and everything which is derived from one). It takes care of
/// CXXMethodDecl's access modifier as well as things like constexpr, noexcept, static and more.
///
/// @param decl The FunctionDecl to process.
/// @param skipAccess Show or hide access modifiers (public, private, protected). The default is to show them.
/// @param cxxInheritedCtorDecl If not null, the type and name of this decl is used for the parameters.
void InsertFunctionNameWithReturnType(const FunctionDecl& decl,
const CXXConstructorDecl* cxxInheritedCtorDecl = nullptr);
template<typename T>
void InsertTemplateArgs(const ArrayRef<T>& array)
{
mOutputFormatHelper.Append('<');
ForEachArg(array, [&](const auto& arg) { InsertTemplateArg(arg); });
/* put as space between to closing brackets: >> -> > > */
if(mOutputFormatHelper.GetString().back() == '>') {
mOutputFormatHelper.Append(' ');
}
mOutputFormatHelper.Append('>');
}
void InsertAttributes(const Decl*);
void InsertAttributes(const Decl::attr_range&);
void InsertAttribute(const Attr&);
void InsertTemplateArg(const TemplateArgument& arg);
STRONG_BOOL(TemplateParamsOnly); ///! Skip template, type constraints and class/typename.
void InsertTemplateParameters(const TemplateParameterList& list,
const TemplateParamsOnly templateParamsOnly = TemplateParamsOnly::No);
void InsertPrimaryTemplate(const FunctionTemplateDecl*);
void StartLifetimeScope();
void EndLifetimeScope();
protected:
virtual bool InsertVarDecl() { return true; }
virtual bool SkipSpaceAfterVarDecl() { return false; }
virtual bool InsertComma() { return false; }
virtual bool InsertSemi() { return true; }
virtual bool InsertNamespace() const { return false; }
/// \brief Show casts to xvalues independent from the show all casts option.
///
/// This helps showing xvalue casts in structured bindings.
virtual bool ShowXValueCasts() const { return false; }
void HandleTemplateParameterPack(const ArrayRef<TemplateArgument>& args);
void HandleCompoundStmt(const CompoundStmt* stmt);
/// \brief Show what is behind a local static variable.
///
/// [stmt.dcl] p4: Initialization of a block-scope variable with static storage duration is thread-safe since C++11.
/// Regardless of that, as long as it is a non-trivally construct and destructable class the compiler adds code to
/// track the initialization state. Reference:
/// - www.opensource.apple.com/source/libcppabi/libcppabi-14/src/cxa_guard.cxx
void HandleLocalStaticNonTrivialClass(const VarDecl* stmt);
virtual void FormatCast(const std::string_view castName,
const QualType& CastDestType,
const Expr* SubExpr,
const CastKind& castKind);
void ForEachArg(const auto& arguments, auto&& lambda) { mOutputFormatHelper.ForEachArg(arguments, lambda); }
void InsertArgWithParensIfNeeded(const Stmt* stmt);
void InsertSuffix(const QualType& type);
void InsertTemplateArg(const TemplateArgumentLoc& arg) { InsertTemplateArg(arg.getArgument()); }
bool InsertLambdaStaticInvoker(const CXXMethodDecl* cxxMethodDecl);
STRONG_BOOL(InsertInline);
void InsertConceptConstraint(const llvm::SmallVectorImpl<const Expr*>& constraints,
const InsertInline insertInline);
void InsertConceptConstraint(const FunctionDecl* tmplDecl);
void InsertConceptConstraint(const VarDecl* varDecl);
void InsertConceptConstraint(const TemplateParameterList& tmplDecl);
void InsertTemplate(const FunctionTemplateDecl*, bool withSpec);
void InsertQualifierAndNameWithTemplateArgs(const DeclarationName& declName, const auto* stmt)
{
InsertQualifierAndName(declName, stmt->getQualifier(), stmt->hasTemplateKeyword());
if(stmt->getNumTemplateArgs()) {
InsertTemplateArgs(*stmt);
} else if(stmt->hasExplicitTemplateArgs()) {
// we have empty templates arguments, but angle brackets provided by the user
mOutputFormatHelper.Append("<>"sv);
}
}
void InsertQualifierAndName(const DeclarationName& declName,
const NestedNameSpecifier* qualifier,
const bool hasTemplateKeyword);
/// For a special case, when a LambdaExpr occurs in a Constructor from an
/// in class initializer, there is a need for a more narrow scope for the \c LAMBDA_SCOPE_HELPER.
void InsertCXXMethodHeader(const CXXMethodDecl* stmt, OutputFormatHelper& initOutputFormatHelper);
void InsertTemplateGuardBegin(const FunctionDecl* stmt);
void InsertTemplateGuardEnd(const FunctionDecl* stmt);
/// \brief Insert \c template<> to introduce a template specialization.
void InsertTemplateSpecializationHeader() { mOutputFormatHelper.AppendNewLine("template<>"sv); }
void InsertNamespace(const NestedNameSpecifier* namespaceSpecifier);
void ParseDeclContext(const DeclContext* Ctx);
STRONG_BOOL(SkipBody);
virtual void InsertCXXMethodDecl(const CXXMethodDecl* stmt, SkipBody skipBody);
void InsertMethodBody(const FunctionDecl* stmt, const size_t posBeforeFunc);
/// \brief Generalized function to insert either a \c CXXConstructExpr or \c CXXUnresolvedConstructExpr
template<typename T>
void InsertConstructorExpr(const T* stmt);
/// \brief Check whether or not this statement will add curlys or parentheses and add them only if required.
void InsertCurlysIfRequired(const Stmt* stmt);
void InsertIfOrSwitchInitVariables(same_as_any_of<const IfStmt, const SwitchStmt> auto* stmt);
void InsertInstantiationPoint(const SourceManager& sm, const SourceLocation& instLoc, std::string_view text = {});
STRONG_BOOL(AddNewLineAfter);
void WrapInCompoundIfNeeded(const Stmt* stmt, const AddNewLineAfter addNewLineAfter);
STRONG_BOOL(AddSpaceAtTheEnd);
enum class BraceKind
{
Parens,
Curlys
};
void WrapInParens(void_func_ref lambda, const AddSpaceAtTheEnd addSpaceAtTheEnd = AddSpaceAtTheEnd::No);
void WrapInParensIfNeeded(bool needsParens,
void_func_ref lambda,
const AddSpaceAtTheEnd addSpaceAtTheEnd = AddSpaceAtTheEnd::No);
void WrapInCurliesIfNeeded(bool needsParens,
void_func_ref lambda,
const AddSpaceAtTheEnd addSpaceAtTheEnd = AddSpaceAtTheEnd::No);
void WrapInCurlys(void_func_ref lambda, const AddSpaceAtTheEnd addSpaceAtTheEnd = AddSpaceAtTheEnd::No);
void WrapInParensOrCurlys(const BraceKind curlys,
void_func_ref lambda,
const AddSpaceAtTheEnd addSpaceAtTheEnd = AddSpaceAtTheEnd::No);
void UpdateCurrentPos() { mCurrentPos = mOutputFormatHelper.CurrentPos(); }
static std::string_view GetBuiltinTypeSuffix(const BuiltinType::Kind& kind);
class LambdaScopeHandler
{
public:
LambdaScopeHandler(LambdaStackType& stack,
OutputFormatHelper& outputFormatHelper,
const LambdaCallerType lambdaCallerType);
~LambdaScopeHandler();
private:
LambdaStackType& mStack;
LambdaHelper mHelper;
OutputFormatHelper& GetBuffer(OutputFormatHelper& outputFormatHelper) const;
};
void HandleLambdaExpr(const LambdaExpr* stmt, LambdaHelper& lambdaHelper);
static std::string FillConstantArray(const ConstantArrayType* ct, const std::string& value, const uint64_t startAt);
static std::string GetValueOfValueInit(const QualType& t);
bool InsideDecltype() const;
LambdaStackType mLambdaStackThis;
LambdaStackType& mLambdaStack;
STRONG_BOOL(SkipVarDecl);
STRONG_BOOL(UseCommaInsteadOfSemi);
STRONG_BOOL(NoEmptyInitList);
STRONG_BOOL(ShowConstantExprValue);
LambdaInInitCapture mLambdaInitCapture{LambdaInInitCapture::No};
ShowConstantExprValue mShowConstantExprValue{ShowConstantExprValue::No};
SkipVarDecl mSkipVarDecl{SkipVarDecl::No};
UseCommaInsteadOfSemi mUseCommaInsteadOfSemi{UseCommaInsteadOfSemi::No};
NoEmptyInitList mNoEmptyInitList{
NoEmptyInitList::No}; //!< At least in case if a requires-clause containing T{} we don't want to get T{{}}.
const LambdaExpr* mLambdaExpr{};
static constexpr auto MAX_FILL_VALUES_FOR_ARRAYS{
uint64_t{100}}; //!< This is the upper limit of elements which will be shown for an array when filled by \c
//!< FillConstantArray.
std::optional<size_t> mCurrentPos{}; //!< The position in mOutputFormatHelper where a potential
//!< std::initializer_list expansion must be inserted.
std::optional<size_t> mCurrentReturnPos{}; //!< The position in mOutputFormatHelper from a return where a
//!< potential std::initializer_list expansion must be inserted.
std::optional<size_t> mCurrentFieldPos{}; //!< The position in mOutputFormatHelper in a class where where a
//!< potential std::initializer_list expansion must be inserted.
OutputFormatHelper* mOutputFormatHelperOutside{
nullptr}; //!< Helper output buffer for std::initializer_list expansion.
bool mRequiresImplicitReturnZero{}; //!< Track whether this is a function with an imlpicit return 0.
bool mSkipSemi{};
ProcessingPrimaryTemplate mProcessingPrimaryTemplate{};
};
//-----------------------------------------------------------------------------
class LambdaCodeGenerator final : public CodeGenerator
{
public:
using CodeGenerator::CodeGenerator;
using CodeGenerator::InsertArg;
void InsertArg(const CXXThisExpr* stmt) override;
bool mCapturedThisAsCopy{};
};
//-----------------------------------------------------------------------------
/*
* \brief Special case to generate the inits of e.g. a \c ForStmt.
*
* This class is a specialization to handle cases where we can have multiple init statements to the same variable and
* hence need only one time the \c VarDecl. An example a for-loops:
\code
for(int x=2, y=3, z=4; i < x; ++i) {}
\endcode
*/
class MultiStmtDeclCodeGenerator final : public CodeGenerator
{
public:
explicit MultiStmtDeclCodeGenerator(OutputFormatHelper& _outputFormatHelper,
LambdaStackType& lambdaStack,
bool insertVarDecl)
: CodeGenerator{_outputFormatHelper, lambdaStack, ProcessingPrimaryTemplate::No}
, mInsertVarDecl{insertVarDecl}
, mInsertComma{}
{
}
// Insert the semi after the last declaration. This implies that this class always requires its own scope.
~MultiStmtDeclCodeGenerator() { mOutputFormatHelper.Append("; "sv); }
using CodeGenerator::InsertArg;
protected:
OnceTrue mInsertVarDecl{}; //! Insert the \c VarDecl only once.
OnceFalse mInsertComma{}; //! Insert the comma after we have generated the first \c VarDecl and we are about to
//! insert another one.
bool InsertVarDecl() override { return mInsertVarDecl; }
bool InsertComma() override { return mInsertComma; }
bool InsertSemi() override { return false; }
};
//-----------------------------------------------------------------------------
struct CoroutineASTData
{
CXXRecordDecl* mFrameType{};
FieldDecl* mResumeFnField{};
FieldDecl* mDestroyFnField{};
FieldDecl* mPromiseField{};
FieldDecl* mSuspendIndexField{};
FieldDecl* mInitialAwaitResumeCalledField{};
MemberExpr* mInitialAwaitResumeCalledAccess{};
DeclRefExpr* mFrameAccessDeclRef{};
MemberExpr* mSuspendIndexAccess{};
bool mDoInsertInDtor{};
std::vector<const CXXThisExpr*> mThisExprs{};
};
///
/// \brief A special generator for coroutines. It is only activated, if \c -show-coroutines-transformation is given as a
/// command line option.
class CoroutinesCodeGenerator final : public CodeGenerator
{
public:
explicit CoroutinesCodeGenerator(OutputFormatHelper& _outputFormatHelper, const size_t posBeforeFunc)
: CoroutinesCodeGenerator{_outputFormatHelper, posBeforeFunc, {}, {}, {}}
{
}
explicit CoroutinesCodeGenerator(OutputFormatHelper& _outputFormatHelper,
const size_t posBeforeFunc,
std::string_view fsmName,
size_t suspendsCount,
CoroutineASTData data)
: CodeGenerator{_outputFormatHelper}
, mPosBeforeFunc{posBeforeFunc}
, mSuspendsCount{suspendsCount}
, mFSMName{fsmName}
, mASTData{data}
{
}
~CoroutinesCodeGenerator() override;
using CodeGenerator::InsertArg;
void InsertArg(const ImplicitCastExpr* stmt) override;
void InsertArg(const CallExpr* stmt) override;
void InsertArg(const CXXRecordDecl* stmt) override;
void InsertArg(const OpaqueValueExpr* stmt) override;
void InsertArg(const CoroutineBodyStmt* stmt) override;
void InsertArg(const CoroutineSuspendExpr* stmt) override;
void InsertArg(const CoreturnStmt* stmt) override;
void InsertCoroutine(const FunctionDecl& fd, const CoroutineBodyStmt* body);
std::string GetFrameName() const { return mFrameName; }
protected:
bool InsertVarDecl() override { return mInsertVarDecl; }
bool SkipSpaceAfterVarDecl() override { return not mInsertVarDecl; }
private:
enum class eState
{
Invalid,
InitialSuspend,
Body,
FinalSuspend,
};
eState mState{};
const size_t mPosBeforeFunc;
size_t mPosBeforeSuspendExpr{};
size_t mSuspendsCount{};
size_t mSuspendsCounter{};
bool mInsertVarDecl{true};
bool mSupressCasts{};
bool mSupressRecordDecls{};
std::string mFrameName{};
std::string mFSMName{};
CoroutineASTData mASTData{};
llvm::DenseMap<const Stmt*, bool> mBinaryExprs{};
static inline llvm::DenseMap<const Expr*, std::string>
mOpaqueValues{}; ///! Keeps track of the current set of opaque value
QualType GetFrameType() const { return QualType(mASTData.mFrameType->getTypeForDecl(), 0); }
QualType GetFramePointerType() const;
std::string BuildResumeLabelName(int) const;
FieldDecl* AddField(std::string_view name, QualType type);
void InsertArgWithNull(const Stmt* stmt);
};
//-----------------------------------------------------------------------------
///
/// \brief A special generator for coroutines. It is only activated, if \c -show-coroutines-transformation is given as a
/// command line option.
class CfrontCodeGenerator final : public CodeGenerator
{
bool mInsertSemi{true}; // We need to for int* p = new{5};
public:
using CodeGenerator::CodeGenerator;
using CodeGenerator::InsertArg;
void InsertArg(const CXXThisExpr*) override;
void InsertArg(const CXXDeleteExpr*) override;
void InsertArg(const CXXNewExpr*) override;
void InsertArg(const CXXOperatorCallExpr*) override;
void InsertArg(const CXXNullPtrLiteralExpr*) override;
void InsertArg(const StaticAssertDecl*) override;
void InsertArg(const CXXRecordDecl*) override;
void InsertArg(const CXXMemberCallExpr*) override;
void InsertArg(const CXXConstructExpr*) override;
void InsertArg(const FunctionDecl* stmt) override;
void InsertArg(const TypedefDecl* stmt) override;
void InsertCXXMethodDecl(const CXXMethodDecl*, CodeGenerator::SkipBody) override;
void FormatCast(const std::string_view, const QualType&, const Expr*, const CastKind&) override;
protected:
bool InsertSemi() override { return std::exchange(mInsertSemi, true); }
};
//-----------------------------------------------------------------------------
///
/// \brief A special container which creates either a \c CodeGenerator or a \c CfrontCodeGenerator depending on the
/// command line options.
class CodeGeneratorVariant
{
union CodeGenerators
{
CodeGenerator cg;
CfrontCodeGenerator cfcg;
CodeGenerators(OutputFormatHelper& _outputFormatHelper,
CodeGenerator::LambdaStackType& lambdaStack,
CodeGenerator::ProcessingPrimaryTemplate processingPrimaryTemplate);
CodeGenerators(OutputFormatHelper& _outputFormatHelper, CodeGenerator::LambdaInInitCapture lambdaInitCapture);
~CodeGenerators();
} cgs;
CodeGenerator* cg;
OutputFormatHelper& ofm;
void Set();
public:
CodeGeneratorVariant(OutputFormatHelper& _outputFormatHelper)
: CodeGeneratorVariant{_outputFormatHelper, CodeGenerator::LambdaInInitCapture::No}
{
}
CodeGeneratorVariant(OutputFormatHelper& _outputFormatHelper,
CodeGenerator::LambdaStackType& lambdaStack,
CodeGenerator::ProcessingPrimaryTemplate processingPrimaryTemplate)
: cgs{_outputFormatHelper, lambdaStack, processingPrimaryTemplate}
, ofm{_outputFormatHelper}
, cg{}
{
Set();
}
CodeGeneratorVariant(OutputFormatHelper& _outputFormatHelper, CodeGenerator::LambdaInInitCapture lambdaInitCapture)
: cgs{_outputFormatHelper, lambdaInitCapture}
, ofm{_outputFormatHelper}
, cg{}
{
Set();
}
CodeGenerator* operator->() { return cg; }
};
//-----------------------------------------------------------------------------
} // namespace clang::insights
#endif /* INSIGHTS_CODE_GENERATOR_H */