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5128 lines (4084 loc) · 188 KB
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/******************************************************************************
*
* C++ Insights, copyright (C) by Andreas Fertig
* Distributed under an MIT license. See LICENSE for details
*
****************************************************************************/
#include <algorithm>
#include <optional>
#include <vector>
#include "ASTHelpers.h"
#include "ClangCompat.h"
#include "CodeGenerator.h"
#include "DPrint.h"
#include "Insights.h"
#include "InsightsHelpers.h"
#include "InsightsOnce.h"
#include "InsightsStrCat.h"
#include "NumberIterator.h"
#include "clang/AST/RecordLayout.h"
#include "clang/Frontend/CompilerInstance.h"
#include "clang/Sema/Sema.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/Support/Path.h"
//-----------------------------------------------------------------------------
/// \brief Convenience macro to create a \ref LambdaScopeHandler on the stack.
#define LAMBDA_SCOPE_HELPER(type) \
LambdaScopeHandler lambdaScopeHandler{mLambdaStack, mOutputFormatHelper, LambdaCallerType::type};
//-----------------------------------------------------------------------------
/// \brief The lambda scope helper is only created if cond is true
#define CONDITIONAL_LAMBDA_SCOPE_HELPER(type, cond) \
std::optional<LambdaScopeHandler> lambdaScopeHandler; \
if(cond) { \
lambdaScopeHandler.emplace(mLambdaStack, mOutputFormatHelper, LambdaCallerType::type); \
}
//-----------------------------------------------------------------------------
namespace ranges = std::ranges;
//-----------------------------------------------------------------------------
namespace clang::insights {
#define BUILD_OPT_AND(name, param) std::function name = [](param t)->MyOptional<param>
#define BUILD_OPT_AND_O(name, param, ret) std::function name = [](param t)->MyOptional<ret>
BUILD_OPT_AND(IsPointer, QualType)
{
if(t->isPointerType()) {
return t;
}
return {};
};
BUILD_OPT_AND(IsPOD, QualType)
{
if(t.isPODType(GetGlobalAST())) {
return t;
}
return {};
};
template<typename T>
std::function Isa = [](QualType t) -> MyOptional<QualType> {
if(isa<T>(t.getTypePtrOrNull())) {
return t;
}
return {};
};
BUILD_OPT_AND_O(CanonicalType, const InitListExpr&, QualType)
{
return t.getType().getCanonicalType();
};
STRONG_BOOL(TrailingSpace);
static std::string AccessToStringWithColon(const AccessSpecifier& access,
const TrailingSpace endWithTrailingSpace = TrailingSpace::Yes)
{
std::string accessStr{getAccessSpelling(access)};
if(not accessStr.empty()) {
if(TrailingSpace::Yes == endWithTrailingSpace) {
accessStr += ": "sv;
} else {
accessStr += ":"sv;
}
}
return accessStr;
}
//-----------------------------------------------------------------------------
using namespace asthelpers;
static std::string_view GetCastName(const CastKind castKind, bool constnessChange = false)
{
if(is{castKind}.any_of(CastKind::CK_BitCast, CastKind::CK_IntegralToPointer, CastKind::CK_PointerToIntegral)) {
return kwReinterpretCast;
}
if((CastKind::CK_NoOp == castKind) and constnessChange) {
return "const_cast"sv;
}
return kwStaticCast;
}
//-----------------------------------------------------------------------------
static std::string_view GetTagDeclTypeName(const TagDecl& decl)
{
if(decl.isClass()) {
return kwClassSpace;
} else if(decl.isUnion()) {
return kwUnionSpace;
} else {
return kwStructSpace;
}
}
//-----------------------------------------------------------------------------
class ArrayInitCodeGenerator final : public CodeGenerator
{
const uint64_t mIndex;
public:
ArrayInitCodeGenerator(OutputFormatHelper& _outputFormatHelper, const uint64_t index)
: CodeGenerator{_outputFormatHelper}
, mIndex{index}
{
}
using CodeGenerator::InsertArg;
void InsertArg(const ArrayInitIndexExpr*) override { mOutputFormatHelper.Append(mIndex); }
};
//-----------------------------------------------------------------------------
/// Handling specialties for decomposition declarations.
///
/// Decompositions declarations have no name. This class stores the made up name and returns it each time the anonymous
/// declaration is asked for a name.
class StructuredBindingsCodeGenerator final : public CodeGenerator
{
std::string mVarName;
public:
StructuredBindingsCodeGenerator(OutputFormatHelper& _outputFormatHelper, std::string&& varName)
: CodeGenerator{_outputFormatHelper}
, mVarName{std::move(varName)}
{
}
using CodeGenerator::InsertArg;
void InsertArg(const DeclRefExpr* stmt) override;
void InsertArg(const BindingDecl* stmt) override;
/// Inserts the bindings of a decompositions declaration.
void InsertDecompositionBindings(const DecompositionDecl& decompositionDeclStmt);
protected:
virtual bool ShowXValueCasts() const override { return true; }
};
//-----------------------------------------------------------------------------
/// Handle using statements which pull functions ore members from a base class into the class.
class UsingCodeGenerator final : public CodeGenerator
{
public:
UsingCodeGenerator(OutputFormatHelper& _outputFormatHelper)
: CodeGenerator{_outputFormatHelper}
{
}
using CodeGenerator::InsertArg;
void InsertArg(const CXXMethodDecl* stmt) override
{
mOutputFormatHelper.Append(kwCppCommentStartSpace);
InsertCXXMethodDecl(stmt, SkipBody::Yes);
}
void InsertArg(const FieldDecl* stmt) override
{
mOutputFormatHelper.Append(kwCppCommentStartSpace);
CodeGenerator::InsertArg(stmt);
}
// makes no sense to insert the class when applying it to using
void InsertArg(const CXXRecordDecl*) override {}
// makes no sense to insert the typedef when applying it to using
void InsertArg(const TypedefDecl*) override {}
protected:
bool InsertNamespace() const override { return true; }
};
//-----------------------------------------------------------------------------
class LambdaNameOnlyCodeGenerator final : public CodeGenerator
{
public:
using CodeGenerator::CodeGenerator;
using CodeGenerator::InsertArg;
void InsertArg(const LambdaExpr* stmt) override { mOutputFormatHelper.Append(GetLambdaName(*stmt), "{}"sv); }
};
//-----------------------------------------------------------------------------
CodeGenerator::LambdaScopeHandler::LambdaScopeHandler(LambdaStackType& stack,
OutputFormatHelper& outputFormatHelper,
const LambdaCallerType lambdaCallerType)
: mStack{stack}
, mHelper{lambdaCallerType, GetBuffer(outputFormatHelper)}
{
mStack.push(mHelper);
}
//-----------------------------------------------------------------------------
CodeGenerator::LambdaScopeHandler::~LambdaScopeHandler()
{
if(not mStack.empty()) {
mStack.pop()->finish();
}
}
//-----------------------------------------------------------------------------
OutputFormatHelper& CodeGenerator::LambdaScopeHandler::GetBuffer(OutputFormatHelper& outputFormatHelper) const
{
// Find the most outer element to place the lambda class definition. For example, if we have this:
// Test( [&]() {} );
// The lambda's class definition needs to be placed _before_ the CallExpr to Test.
for(auto& l : mStack) {
switch(l.callerType()) {
case LambdaCallerType::CallExpr: [[fallthrough]];
case LambdaCallerType::VarDecl: [[fallthrough]];
case LambdaCallerType::ReturnStmt: [[fallthrough]];
case LambdaCallerType::OperatorCallExpr: [[fallthrough]];
case LambdaCallerType::MemberCallExpr: [[fallthrough]];
case LambdaCallerType::BinaryOperator: [[fallthrough]];
case LambdaCallerType::CXXMethodDecl: return l.buffer();
default: break;
}
}
return outputFormatHelper;
}
//-----------------------------------------------------------------------------
static std::string_view ArrowOrDot(bool isArrow)
{
return isArrow ? "->"sv : "."sv;
}
//-----------------------------------------------------------------------------
template<typename T>
static T ValueOrDefault(bool b, T v)
{
if(b) {
return v;
}
return {};
}
//-----------------------------------------------------------------------------
template<typename T>
static T ValueOr(bool b, T val, T el)
{
if(b) {
return val;
}
return el;
}
//-----------------------------------------------------------------------------
void CodeGenerator::InsertArg(const CXXDependentScopeMemberExpr* stmt)
{
if(not stmt->isImplicitAccess()) {
InsertArg(stmt->getBase());
} else {
InsertNamespace(stmt->getQualifier());
}
std::string_view op{ValueOrDefault(not stmt->isImplicitAccess(), ArrowOrDot(stmt->isArrow()))};
mOutputFormatHelper.Append(op, stmt->getMemberNameInfo().getAsString());
}
//-----------------------------------------------------------------------------
void CodeGenerator::InsertArg(const CXXForRangeStmt* rangeForStmt)
{
auto& langOpts{GetLangOpts(*rangeForStmt->getLoopVariable())};
const bool onlyCpp11{not langOpts.CPlusPlus17};
auto* rwStmt = const_cast<CXXForRangeStmt*>(rangeForStmt);
StmtsContainer outerScopeStmts{};
// C++20 init-statement
outerScopeStmts.Add(rangeForStmt->getInit());
// range statement
outerScopeStmts.Add(rangeForStmt->getRangeStmt());
if(not onlyCpp11) {
outerScopeStmts.Add(rangeForStmt->getBeginStmt());
outerScopeStmts.Add(rangeForStmt->getEndStmt());
}
// add the loop variable to the body
StmtsContainer bodyStmts{};
bodyStmts.Add(rangeForStmt->getLoopVarStmt());
// add the body itself, without the CompoundStmt
bodyStmts.AddBodyStmts(rwStmt->getBody());
const auto& ctx = rangeForStmt->getLoopVariable()->getASTContext();
// In case of a range-based for-loop inside an unevaluated template the begin and end statements are not present. In
// this case just add a nullptr.
auto* declStmt = [&]() -> DeclStmt* {
if(onlyCpp11) {
return mkDeclStmt(rwStmt->getBeginStmt() ? rwStmt->getBeginStmt()->getSingleDecl() : nullptr,
rwStmt->getEndStmt() ? rwStmt->getEndStmt()->getSingleDecl() : nullptr);
}
return nullptr;
}();
auto* innerScope = mkCompoundStmt(bodyStmts, rangeForStmt->getBeginLoc(), rangeForStmt->getEndLoc());
auto* forStmt = new(ctx) ForStmt(ctx,
declStmt,
rwStmt->getCond(),
rwStmt->getLoopVariable(),
rwStmt->getInc(),
innerScope,
rangeForStmt->getBeginLoc(),
rangeForStmt->getEndLoc(),
rangeForStmt->getEndLoc());
outerScopeStmts.Add(forStmt);
auto* outerScope = mkCompoundStmt(outerScopeStmts, rangeForStmt->getBeginLoc(), rangeForStmt->getEndLoc());
InsertArg(outerScope);
mOutputFormatHelper.AppendNewLine();
}
//-----------------------------------------------------------------------------
void CodeGenerator::InsertQualifierAndName(const DeclarationName& declName,
const NestedNameSpecifier* qualifier,
const bool hasTemplateKeyword)
{
mOutputFormatHelper.Append(ScopeHandler::RemoveCurrentScope(GetNestedName(qualifier)),
ValueOrDefault(hasTemplateKeyword, kwTemplateSpace),
declName.getAsString());
}
//-----------------------------------------------------------------------------
void CodeGenerator::InsertNamespace(const NestedNameSpecifier* stmt)
{
mOutputFormatHelper.Append(ScopeHandler::RemoveCurrentScope(GetNestedName(stmt)));
}
//-----------------------------------------------------------------------------
void CodeGenerator::InsertArg(const UnresolvedLookupExpr* stmt)
{
InsertQualifierAndNameWithTemplateArgs(stmt->getName(), stmt);
}
//-----------------------------------------------------------------------------
void CodeGenerator::InsertArg(const DependentScopeDeclRefExpr* stmt)
{
InsertQualifierAndNameWithTemplateArgs(stmt->getDeclName(), stmt);
}
//-----------------------------------------------------------------------------
void CodeGenerator::InsertArg(const VarTemplateDecl* stmt)
{
const auto* templatedDecl = stmt->getTemplatedDecl();
// Insert only the primary template here. The specializations are inserted via their instantiated
// VarTemplateSpecializationDecl which resolved to a VarDecl. It looks like whether the variable has an initializer
// or not can be used to distinguish between the primary template and one appearing in a templated class.
RETURN_IF(not templatedDecl->hasInit());
// VarTemplatedDecl's can have lambdas as initializers. Push a VarDecl on the stack, otherwise the lambda would
// appear in the middle of template<....> and the variable itself.
{
LAMBDA_SCOPE_HELPER(DecltypeWithName); // Needed for P0315Checker
InsertTemplateParameters(*stmt->getTemplateParameters());
}
LAMBDA_SCOPE_HELPER(VarDecl);
InsertArg(templatedDecl);
for(OnceTrue first{}; const auto* spec : stmt->specializations()) {
if(TSK_ExplicitSpecialization == spec->getSpecializationKind()) {
continue;
}
if(first) {
mOutputFormatHelper.AppendNewLine();
}
InsertArg(spec);
}
}
//-----------------------------------------------------------------------------
void CodeGenerator::InsertArg(const ConceptDecl* stmt)
{
LAMBDA_SCOPE_HELPER(Decltype);
InsertTemplateParameters(*stmt->getTemplateParameters());
mOutputFormatHelper.Append(kwConceptSpace, stmt->getName(), hlpAssing);
InsertArg(stmt->getConstraintExpr());
mOutputFormatHelper.AppendSemiNewLine();
mOutputFormatHelper.AppendNewLine();
}
//-----------------------------------------------------------------------------
void CodeGenerator::InsertArg(const ConditionalOperator* stmt)
{
InsertArg(stmt->getCond());
mOutputFormatHelper.Append(" ? "sv);
InsertArg(stmt->getLHS());
mOutputFormatHelper.Append(" : "sv);
InsertArg(stmt->getRHS());
}
//-----------------------------------------------------------------------------
void CodeGenerator::InsertArg(const DoStmt* stmt)
{
mOutputFormatHelper.Append(kwDoSpace);
WrapInCompoundIfNeeded(stmt->getBody(), AddNewLineAfter::No);
mOutputFormatHelper.Append(kwWhile);
WrapInParens([&]() { InsertArg(stmt->getCond()); }, AddSpaceAtTheEnd::No);
mOutputFormatHelper.AppendSemiNewLine();
mOutputFormatHelper.AppendNewLine();
}
//-----------------------------------------------------------------------------
void CodeGenerator::InsertArg(const CaseStmt* stmt)
{
mOutputFormatHelper.Append(kwCaseSpace);
InsertArg(stmt->getLHS());
mOutputFormatHelper.Append(": "sv);
InsertArg(stmt->getSubStmt());
}
//-----------------------------------------------------------------------------
void CodeGenerator::InsertArg(const BreakStmt* /*stmt*/)
{
mOutputFormatHelper.Append(kwBreak);
}
//-----------------------------------------------------------------------------
void CodeGenerator::InsertArg(const DefaultStmt* stmt)
{
mOutputFormatHelper.Append("default: "sv);
InsertArg(stmt->getSubStmt());
}
//-----------------------------------------------------------------------------
void CodeGenerator::InsertArg(const ContinueStmt* /*stmt*/)
{
mOutputFormatHelper.Append(kwContinue);
}
//-----------------------------------------------------------------------------
void CodeGenerator::InsertArg(const GotoStmt* stmt)
{
mOutputFormatHelper.Append(kwGotoSpace);
InsertArg(stmt->getLabel());
}
//-----------------------------------------------------------------------------
void CodeGenerator::InsertArg(const LabelStmt* stmt)
{
mOutputFormatHelper.AppendNewLine(stmt->getName(), ":"sv);
if(stmt->getSubStmt()) {
InsertArg(stmt->getSubStmt());
}
}
//-----------------------------------------------------------------------------
void CodeGenerator::InsertArg(const SwitchStmt* stmt)
{
const bool hasInit{stmt->getInit() or stmt->getConditionVariable()};
if(hasInit) {
mOutputFormatHelper.OpenScope();
InsertIfOrSwitchInitVariables(stmt);
}
mOutputFormatHelper.Append(kwSwitch);
WrapInParens([&]() { InsertArg(stmt->getCond()); }, AddSpaceAtTheEnd::Yes);
InsertArg(stmt->getBody());
if(hasInit) {
mOutputFormatHelper.CloseScope();
}
mOutputFormatHelper.AppendNewLine();
}
//-----------------------------------------------------------------------------
void CodeGenerator::InsertArg(const WhileStmt* stmt)
{
auto* rwStmt = const_cast<WhileStmt*>(stmt);
auto* conditionVar{rwStmt->getConditionVariable()};
{
// We need to handle the case that a lambda is used in the init-statement of the for-loop.
LAMBDA_SCOPE_HELPER(VarDecl);
if(conditionVar) {
mOutputFormatHelper.OpenScope();
InsertArg(conditionVar);
}
mOutputFormatHelper.Append(kwWhile);
WrapInParens([&]() { InsertArg(stmt->getCond()); }, AddSpaceAtTheEnd::Yes);
}
if(not conditionVar) {
WrapInCompoundIfNeeded(stmt->getBody(), AddNewLineAfter::Yes);
} else {
const auto& ctx = GetGlobalAST();
StmtsContainer bodyStmts{};
bodyStmts.AddBodyStmts(rwStmt->getBody());
bodyStmts.AddBodyStmts(Assign(conditionVar, conditionVar->getInit()));
InsertArg(mkCompoundStmt(bodyStmts, stmt->getBeginLoc(), stmt->getEndLoc()));
}
if(conditionVar) {
mOutputFormatHelper.CloseScope();
}
mOutputFormatHelper.AppendNewLine();
}
//-----------------------------------------------------------------------------
/// Get the name of a \c FieldDecl in case this \c FieldDecl is part of a lambda. The name has to be retrieved from the
/// capture fields or can be \c __this.
static std::optional<std::string> GetFieldDeclNameForLambda(const FieldDecl& fieldDecl,
const CXXRecordDecl& cxxRecordDecl)
{
if(cxxRecordDecl.isLambda()) {
llvm::DenseMap<const ValueDecl*, FieldDecl*> captures{};
FieldDecl* thisCapture{};
cxxRecordDecl.getCaptureFields(captures, thisCapture);
if(&fieldDecl == thisCapture) {
return std::string{kwInternalThis};
} else {
for(const auto& [key, value] : captures) {
if(&fieldDecl == value) {
return GetName(*key);
}
}
}
}
return {};
}
//-----------------------------------------------------------------------------
void CodeGenerator::InsertArg(const SourceLocExpr* stmt)
{
mOutputFormatHelper.Append(stmt->getBuiltinStr(), "()"sv);
}
//-----------------------------------------------------------------------------
void CodeGenerator::InsertArg(const MemberExpr* stmt)
{
const auto* base = stmt->getBase();
const bool skipBase{[&] {
if(const auto* implicitCast = dyn_cast_or_null<ImplicitCastExpr>(base)) {
if(CastKind::CK_UncheckedDerivedToBase == implicitCast->getCastKind()) {
// if this calls a protected function we cannot cast it to the base, this would not compile
return isa<CXXThisExpr>(implicitCast->IgnoreImpCasts());
}
}
return false;
}()};
if(skipBase) {
mOutputFormatHelper.Append(kwCCommentStartSpace);
}
InsertArg(base);
const auto* meDecl = stmt->getMemberDecl();
bool skipTemplateArgs{false};
const auto name = [&]() -> std::string {
// Handle a special case where we have a lambda static invoke operator. In that case use the appropriate
// using retType as return type
if(const auto* m = dyn_cast_or_null<CXXMethodDecl>(meDecl)) {
if(const auto* rd = m->getParent(); rd and rd->isLambda() and isa<CXXConversionDecl>(m)) {
skipTemplateArgs = true;
return StrCat(kwOperatorSpace, GetLambdaName(*rd), "::"sv, BuildRetTypeName(*rd));
}
}
// This is at least the case for lambdas, where members are created by capturing a structured binding. See #181.
else if(const auto* fd = dyn_cast_or_null<FieldDecl>(meDecl)) {
if(const auto* cxxRecordDecl = dyn_cast_or_null<CXXRecordDecl>(fd->getParent())) {
if(const auto& fieldName = GetFieldDeclNameForLambda(*fd, *cxxRecordDecl)) {
return fieldName.value();
}
}
}
// Special case. If this is a CXXConversionDecl it might be:
// a) a template so we need the template arguments from this type
// b) in a namespace and need want to preserve that one.
if(const auto* convDecl = dyn_cast_or_null<CXXConversionDecl>(meDecl)) {
return StrCat(kwOperatorSpace, GetName(convDecl->getConversionType()));
}
return stmt->getMemberNameInfo().getName().getAsString();
}();
mOutputFormatHelper.Append(ArrowOrDot(stmt->isArrow()));
if(skipBase) {
mOutputFormatHelper.Append(kwSpaceCCommentEndSpace);
}
mOutputFormatHelper.Append(name);
RETURN_IF(skipTemplateArgs);
if(const auto cxxMethod = dyn_cast_or_null<CXXMethodDecl>(meDecl)) {
if(const auto* tmplArgs = cxxMethod->getTemplateSpecializationArgs()) {
OutputFormatHelper ofm{};
ofm.Append('<');
bool haveArg{false};
for(OnceFalse needsComma{}; const auto& arg : tmplArgs->asArray()) {
if(arg.getKind() == TemplateArgument::Integral) {
ofm.AppendComma(needsComma);
ofm.Append(arg.getAsIntegral());
haveArg = true;
} else {
break;
}
}
if(haveArg) {
mOutputFormatHelper.Append(ofm, ">"sv);
} else if(not isa<CXXConversionDecl>(meDecl)) { // A special case from p0892 a templated conversion
// operator does not carry the specialization args...
InsertTemplateArgs(*tmplArgs);
}
}
}
}
//-----------------------------------------------------------------------------
void CodeGenerator::InsertArg(const UnaryExprOrTypeTraitExpr* stmt)
{
mOutputFormatHelper.Append(std::string_view{getTraitSpelling(stmt->getKind())});
if(not stmt->isArgumentType()) {
const auto* argExpr = stmt->getArgumentExpr();
const bool needsParens{not isa<ParenExpr>(argExpr)};
WrapInParensIfNeeded(needsParens, [&] { InsertArg(argExpr); });
} else {
WrapInParens([&] { mOutputFormatHelper.Append(GetName(stmt->getTypeOfArgument())); });
}
}
//-----------------------------------------------------------------------------
void CodeGenerator::InsertArg(const IntegerLiteral* stmt)
{
const auto& type = stmt->getType();
const bool isSigned = type->isSignedIntegerType();
mOutputFormatHelper.Append(llvm::toString(stmt->getValue(), 10, isSigned));
InsertSuffix(type);
}
//-----------------------------------------------------------------------------
void CodeGenerator::InsertArg(const FloatingLiteral* stmt)
{
mOutputFormatHelper.Append(stmt->getValue());
InsertSuffix(stmt->getType());
}
//-----------------------------------------------------------------------------
void CodeGenerator::InsertArg(const CXXTypeidExpr* stmt)
{
mOutputFormatHelper.Append(kwTypeId);
WrapInParens([&]() {
if(stmt->isTypeOperand()) {
mOutputFormatHelper.Append(GetName(stmt->getTypeOperand(const_cast<ASTContext&>(GetGlobalAST()))));
} else {
InsertArg(stmt->getExprOperand());
}
});
}
//-----------------------------------------------------------------------------
void CodeGenerator::InsertArg(const BinaryOperator* stmt)
{
LAMBDA_SCOPE_HELPER(BinaryOperator);
BackupAndRestore _{mLastExpr, stmt->getLHS()};
const bool needLHSParens{isa<BinaryOperator>(stmt->getLHS()->IgnoreImpCasts())};
WrapInParensIfNeeded(needLHSParens, [&] { InsertArg(stmt->getLHS()); });
mOutputFormatHelper.Append(" "sv, stmt->getOpcodeStr(), " "sv);
const bool needRHSParens{isa<BinaryOperator>(stmt->getRHS()->IgnoreImpCasts())};
WrapInParensIfNeeded(needRHSParens, [&] { InsertArg(stmt->getRHS()); });
}
//-----------------------------------------------------------------------------
void CodeGenerator::InsertArg(const CompoundAssignOperator* stmt)
{
LAMBDA_SCOPE_HELPER(BinaryOperator);
const bool needLHSParens{isa<BinaryOperator>(stmt->getLHS()->IgnoreImpCasts())};
WrapInParensIfNeeded(needLHSParens, [&] { InsertArg(stmt->getLHS()); });
mOutputFormatHelper.Append(hlpAssing);
// we may need a cast around this back to the src type
const bool needCast{stmt->getLHS()->getType() != stmt->getComputationLHSType()};
if(needCast) {
mOutputFormatHelper.Append(kwStaticCast, "<"sv, GetName(stmt->getLHS()->getType()), ">("sv);
}
WrapInParensIfNeeded(needLHSParens, [&] {
if(stmt->getDependence() != ExprDependenceScope::ExprDependence::None) {
InsertArg(stmt->getLHS());
} else {
clang::ExprResult res = stmt->getLHS();
// This cast is not present in the AST. However, if the LHS type is smaller than RHS there is an implicit
// cast to RHS-type and the result is casted back to LHS-type: static_cast<LHSTy>( static_cast<RHSTy>(LHS) +
// RHS )
if(const auto resultingType = GetGlobalCI().getSema().PrepareScalarCast(res, stmt->getComputationLHSType());
resultingType != CK_NoOp) {
const QualType castDestType = stmt->getComputationLHSType();
FormatCast(kwStaticCast, castDestType, stmt->getLHS(), resultingType);
} else {
InsertArg(stmt->getLHS());
}
}
});
mOutputFormatHelper.Append(
" "sv, BinaryOperator::getOpcodeStr(BinaryOperator::getOpForCompoundAssignment(stmt->getOpcode())), " "sv);
const bool needRHSParens{isa<BinaryOperator>(stmt->getRHS()->IgnoreImpCasts())};
WrapInParensIfNeeded(needRHSParens, [&] { InsertArg(stmt->getRHS()); });
if(needCast) {
mOutputFormatHelper.Append(")"sv);
}
}
//-----------------------------------------------------------------------------
void CodeGenerator::InsertArg(const CXXRewrittenBinaryOperator* stmt)
{
LAMBDA_SCOPE_HELPER(BinaryOperator);
InsertArg(stmt->getSemanticForm());
}
//-----------------------------------------------------------------------------
static std::string_view GetStorageClassAsString(const StorageClass& sc)
{
if(SC_None != sc) {
return VarDecl::getStorageClassSpecifierString(sc);
}
return {};
}
//-----------------------------------------------------------------------------
static std::string GetStorageClassAsStringWithSpace(const StorageClass& sc)
{
std::string ret{GetStorageClassAsString(sc)};
if(not ret.empty()) {
ret.append(" "sv);
}
return ret;
}
//-----------------------------------------------------------------------------
static std::string GetQualifiers(const VarDecl& vd)
{
std::string qualifiers{};
if(vd.isInline() or vd.isInlineSpecified()) {
qualifiers += kwInlineSpace;
}
qualifiers += GetStorageClassAsStringWithSpace(vd.getStorageClass());
if(vd.isConstexpr()) {
qualifiers += kwConstExprSpace;
}
return qualifiers;
}
//-----------------------------------------------------------------------------
static std::string FormatVarTemplateSpecializationDecl(const Decl* decl, std::string&& defaultName)
{
std::string name{std::move(defaultName)};
if(const auto* tvd = dyn_cast_or_null<VarTemplateSpecializationDecl>(decl)) {
OutputFormatHelper outputFormatHelper{};
CodeGeneratorVariant codeGenerator{outputFormatHelper};
codeGenerator->InsertTemplateArgs(tvd->getTemplateArgs());
name += outputFormatHelper;
}
return name;
}
//-----------------------------------------------------------------------------
/// \brief Find a \c DeclRefExpr belonging to a \c DecompositionDecl
class BindingDeclFinder : public ConstStmtVisitor<BindingDeclFinder>
{
bool mIsBinding{};
public:
BindingDeclFinder() = default;
void VisitDeclRefExpr(const DeclRefExpr* expr)
{
if(isa<DecompositionDecl>(expr->getDecl())) {
mIsBinding = true;
}
}
void VisitStmt(const Stmt* stmt)
{
for(const auto* child : stmt->children()) {
if(child) {
Visit(child);
}
RETURN_IF(mIsBinding);
}
}
bool Find(const Stmt* stmt)
{
if(stmt) {
VisitStmt(stmt);
}
return mIsBinding;
}
};
//-----------------------------------------------------------------------------
/// \brief Find a \c DeclRefExpr belonging to a \c DecompositionDecl
class TemporaryDeclFinder : public StmtVisitor<TemporaryDeclFinder>
{
CodeGenerator& codeGenerator;
bool mFound{};
bool mHaveTemporary{};
Stmt* mPrevStmt{};
std::string mTempName{};
std::vector<VarDecl*> mDecls{};
public:
TemporaryDeclFinder(CodeGenerator& _codeGenerator, const Stmt* stmt, bool inspectReturn = false)
: codeGenerator{_codeGenerator}
, mPrevStmt{const_cast<Stmt*>(stmt)}
{
RETURN_IF(not GetInsightsOptions().ShowLifetime);
Visit(mPrevStmt);
for(auto d : mDecls) {
codeGenerator.InsertArg(d);
}
RETURN_IF(not GetInsightsOptions().UseShow2C or mFound or not inspectReturn);
if(auto* expr = dyn_cast_or_null<CXXConstructExpr>(stmt)) {
mTempName = GetTemporaryName(*expr);
#if 0
auto* dummy = Function("dummy"sv, VoidTy(), {});
auto* vd = Variable(mTempName, expr->getType(), dummy->getDeclContext());
dummy->getDeclContext()->addDecl(vd);
vd->setInit(const_cast<CXXConstructExpr*>(expr));
vd->setStorageClass(SC_None);
#else
// XXX hack. Our normal VarDecl is at TU level. It then appears in cxa_start...
auto& ctx = GetGlobalAST();
auto* vd = ImplicitParamDecl::Create(const_cast<ASTContext&>(ctx),
ctx.getTranslationUnitDecl(),
{},
&ctx.Idents.get(mTempName),
expr->getType(),
ImplicitParamKind::Other);
#endif
mFound = true;
codeGenerator.InsertArg(vd);
} else if(auto* expr = dyn_cast_or_null<InitListExpr>(stmt)) {
mTempName = GetTemporaryName(*expr);
auto* vd = Variable(mTempName, expr->getType());
vd->setInit(const_cast<InitListExpr*>(expr));
mFound = true;
codeGenerator.InsertArg(vd);
}
}
~TemporaryDeclFinder()
{
if(mHaveTemporary) {
codeGenerator.EndLifetimeScope();
}
}
bool Found() const { return mFound; }
std::string Name() const { return mTempName; }
void VisitCXXTemporaryObjectExpr(CXXTemporaryObjectExpr* expr)
{
mTempName = GetName(*expr);
mFound = true;
auto* vd = Variable(mTempName, expr->getType());
// In the Cfront case the contents of the expression go after the generated constructor. In the lifetime
// _only_ case go with the variable.
if(not GetInsightsOptions().UseShow2C) {
// Since we insert the statement below we must clone this expression otherwise we look at a recursion.
auto* ctorConstructExpr = CXXConstructExpr::Create(GetGlobalAST(),
expr->getType(),
expr->getBeginLoc(),
expr->getConstructor(),
expr->isElidable(),
{expr->getArgs(), expr->getNumArgs()},
expr->hadMultipleCandidates(),
expr->isListInitialization(),
expr->isStdInitListInitialization(),
expr->requiresZeroInitialization(),
expr->getConstructionKind(),
expr->getParenOrBraceRange());
vd->setInit(ctorConstructExpr);
auto* newValue = mkDeclRefExpr(vd);
ReplaceNode(mPrevStmt, expr, newValue);
}