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clang-ast-visitor.cc
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// clang-ast-visitor.cc
// Code for clang-ast-visitor.h.
#include "clang-ast-visitor.h" // this module
// this dir
#include "clang-util.h" // ClangUtil, assert_dyn_cast
#include "enum-util.h" // ENUM_TABLE_LOOKUP_CHECK_SIZE
// smbase
#include "smbase/gdvalue.h" // gdv::{GDValue, GDVMap}
#include "smbase/gdvsymbol.h" // gdv::GDVSymbol
#include "smbase/xassert.h" // xassert
// clang
#include "clang/AST/DeclFriend.h" // clang::{FriendDecl, ...}
#include "clang/AST/ExprCXX.h" // clang::{CXXConstructExpr, ...}
#include "clang/AST/ExprConcepts.h" // clang::concepts::Requirement
#include "clang/AST/StmtCXX.h" // clang::{CXXCatchStmt, ...}
#include "clang/Basic/Version.h" // CLANG_VERSION_MAJOR
using namespace gdv;
using clang::dyn_cast;
// Get the DeclContext aspect of 'decl'.
#define DECL_CONTEXT_OF(decl) assert_dyn_cast(clang::DeclContext, (decl))
char const *toString(VisitDeclContext vdc)
{
ENUM_TABLE_LOOKUP_CHECK_SIZE(/*no qual*/, VisitDeclContext,
NUM_VISIT_DECL_CONTEXTS, vdc,
VDC_NONE,
VDC_ENUM_DECL,
VDC_RECORD_DECL,
VDC_EXPORT_DECL,
VDC_EXTERN_C_DECL,
VDC_LINKAGE_SPEC_DECL,
VDC_NAMESPACE_DECL,
VDC_REQUIRES_EXPR_BODY_DECL,
VDC_TRANSLATION_UNIT_DECL,
VDC_TEMPLATE_DECL,
VDC_FRIEND_DECL,
VDC_FRIEND_TEMPLATE_DECL,
VDC_FUNCTION_TEMPLATE_INSTANTIATION,
VDC_CLASS_TEMPLATE_INSTANTIATION,
VDC_VAR_TEMPLATE_INSTANTIATION,
VDC_IMPLICIT_FUNCTION_DECL_PARAMETER,
VDC_TEMPLATE_DECL_PARAMETER,
#if CLANG_VERSION_MAJOR < 18
VDC_CLASS_SCOPE_FUNCTION_SPECIALIZATION_DECL,
#endif
VDC_FUNCTION_TYPE_PARAMETER,
VDC_CXX_CATCH_STMT,
VDC_DECL_STMT,
VDC_LAMBDA_EXPR_CAPTURE,
VDC_LAMBDA_EXPR_CLASS,
VDC_REQUIRES_EXPR_BODY,
VDC_REQUIRES_EXPR_PARAM,
VDC_RETURN_STMT_NRVO_CANDIDATE,
);
return "unknown";
}
#define DEFINE_TOGDVALUE_USING_TOSTRING(type) \
gdv::GDValue toGDValue(type value) \
{ \
return GDVSymbol(toString(value)); \
}
DEFINE_TOGDVALUE_USING_TOSTRING(VisitDeclContext)
char const *toString(VisitStmtContext vsc)
{
ENUM_TABLE_LOOKUP_CHECK_SIZE(/*no qual*/, VisitStmtContext,
NUM_VISIT_STMT_CONTEXTS, vsc,
VSC_NONE,
VSC_CXX_CTOR_INITIALIZER,
VSC_DECLARATOR_DECL_TRAILING_REQUIRES,
VSC_VAR_DECL_INIT,
VSC_FUNCTION_DECL_BODY,
VSC_FIELD_DECL_BIT_WIDTH,
VSC_FIELD_DECL_INIT,
VSC_ENUM_CONSTANT_DECL,
VSC_FILE_SCOPE_ASM_DECL_STRING,
VSC_TEMPLATE_DECL_REQUIRES_CLAUSE,
VSC_NON_TYPE_TEMPLATE_PARM_DECL_DEFAULT,
VSC_TYPE_OF_TYPE,
VSC_DECLTYPE_TYPE,
VSC_ARRAY_TYPE_SIZE,
VSC_CXX_CATCH_STMT,
VSC_CXX_FOR_RANGE_STMT_INIT,
VSC_CXX_FOR_RANGE_STMT_RANGE,
VSC_CXX_FOR_RANGE_STMT_BEGIN,
VSC_CXX_FOR_RANGE_STMT_END,
VSC_CXX_FOR_RANGE_STMT_COND,
VSC_CXX_FOR_RANGE_STMT_INC,
VSC_CXX_FOR_RANGE_STMT_LOOPVAR,
VSC_CXX_FOR_RANGE_STMT_BODY,
VSC_CXX_TRY_STMT_TRY_BLOCK,
VSC_CXX_TRY_STMT_HANDLER,
VSC_COMPOUND_STMT,
VSC_DO_STMT_BODY,
VSC_DO_STMT_COND,
VSC_FOR_STMT_INIT,
VSC_FOR_STMT_CONDVAR,
VSC_FOR_STMT_COND,
VSC_FOR_STMT_INC,
VSC_FOR_STMT_BODY,
VSC_IF_STMT_INIT,
VSC_IF_STMT_CONDVAR,
VSC_IF_STMT_COND,
VSC_IF_STMT_THEN,
VSC_IF_STMT_ELSE,
VSC_INDIRECT_GOTO_STMT,
VSC_RETURN_STMT_VALUE,
VSC_CASE_STMT_LHS,
VSC_CASE_STMT_RHS,
VSC_CASE_STMT_SUB,
VSC_DEFAULT_STMT,
VSC_SWITCH_STMT_INIT,
VSC_SWITCH_STMT_CONDVAR,
VSC_SWITCH_STMT_COND,
VSC_SWITCH_STMT_BODY,
VSC_ATTRIBUTED_STMT,
VSC_BINARY_CONDITIONAL_OPERATOR_COMMON,
VSC_BINARY_CONDITIONAL_OPERATOR_COND,
VSC_BINARY_CONDITIONAL_OPERATOR_TRUE,
VSC_BINARY_CONDITIONAL_OPERATOR_FALSE,
VSC_CONDITIONAL_OPERATOR_COND,
VSC_CONDITIONAL_OPERATOR_TRUE,
VSC_CONDITIONAL_OPERATOR_FALSE,
VSC_ARRAY_INIT_LOOP_EXPR_COMMON,
VSC_ARRAY_INIT_LOOP_EXPR_SUB,
VSC_ARRAY_SUBSCRIPT_EXPR_LHS,
VSC_ARRAY_SUBSCRIPT_EXPR_RHS,
VSC_AS_TYPE_EXPR,
VSC_BINARY_OPERATOR_LHS,
VSC_BINARY_OPERATOR_RHS,
VSC_CXX_BIND_TEMPORARY_EXPR,
VSC_CXX_CONSTRUCT_EXPR,
VSC_CXX_DELETE_EXPR,
VSC_CXX_DEPENDENT_SCOPE_MEMBER_EXPR_BASE,
VSC_CXX_FOLD_EXPR_CALLEE,
VSC_CXX_FOLD_EXPR_LHS,
VSC_CXX_FOLD_EXPR_RHS,
VSC_CXX_NEW_EXPR_ARRAY_SIZE,
VSC_CXX_NEW_EXPR_INIT,
VSC_CXX_NEW_PLACEMENT_ARG,
VSC_CXX_NOEXCEPT_EXPR,
VSC_CXX_PSEUDO_DESTRUCTOR_EXPR,
VSC_CXX_STD_INITIALIZER_LIST_EXPR,
VSC_CXX_THROW_EXPR,
VSC_CXX_TYPEID_EXPR,
VSC_CXX_UUIDOF_EXPR,
VSC_CXX_UNRESOLVED_CONSTRUCT_EXPR_ARG,
VSC_CONCEPTS_EXPR_REQUIREMENT,
VSC_CONCEPTS_NESTED_REQUIREMENT,
VSC_DESIGNATED_INIT_EXPR,
VSC_CONSTANT_EXPR,
VSC_EXPR_WITH_CLEANUPS,
VSC_MATERIALIZE_TEMPORARY_EXPR,
VSC_EXPLICIT_CAST_EXPR,
VSC_IMPLICIT_CAST_EXPR,
VSC_CHOOSE_EXPR_COND,
VSC_CHOOSE_EXPR_LHS,
VSC_CHOOSE_EXPR_RHS,
VSC_COMPOUND_LITERAL_EXPR,
VSC_CONVERT_VECTOR_EXPR,
VSC_CALL_EXPR_CALLEE,
VSC_CALL_EXPR_ARG,
VSC_INIT_LIST_EXPR,
VSC_LAMBDA_EXPR_CAPTURE,
VSC_MEMBER_EXPR,
VSC_PAREN_EXPR,
VSC_PAREN_LIST_EXPR,
VSC_SUBST_NON_TYPE_TEMPLATE_PARM_EXPR,
VSC_UNARY_EXPR_OR_TYPE_TRAIT_EXPR,
VSC_UNARY_OPERATOR,
VSC_CXX_DEFAULT_INIT_EXPR,
VSC_TEMPLATE_ARGUMENT,
);
return "unknown";
}
DEFINE_TOGDVALUE_USING_TOSTRING(VisitStmtContext)
char const *toString(VisitTypeContext vtc)
{
ENUM_TABLE_LOOKUP_CHECK_SIZE(/*no qual*/, VisitTypeContext,
NUM_VISIT_TYPE_CONTEXTS, vtc,
VTC_NONE,
VTC_DECLARATOR_DECL,
VTC_TYPEDEF_NAME_DECL,
VTC_ENUM_DECL_UNDERLYING,
VTC_CLASS_TEMPLATE_SPECIALIZATION_DECL,
VTC_CLASS_TEMPLATE_PARTIAL_SPECIALIZATION_DECL,
VTC_CXX_RECORD_DECL_BASE,
VTC_CXX_CTOR_INITIALIZER,
VTC_FRIEND_DECL,
VTC_FRIEND_TEMPLATE_DECL,
VTC_TEMPLATE_TYPE_PARM_DECL_DEFAULT,
VTC_QUALIFIED_TYPE,
VTC_ATTRIBUTED_TYPE,
VTC_PAREN_TYPE,
VTC_ADJUSTED_TYPE,
VTC_POINTER_TYPE,
VTC_BLOCK_POINTER_TYPE,
VTC_MEMBER_POINTER_TYPE_CLASS,
VTC_MEMBER_POINTER_TYPE_POINTEE,
VTC_OBJC_OBJECT_POINTER_TYPE,
VTC_REFERENCE_TYPE,
VTC_LVALUE_REFERENCE_TYPE,
VTC_RVALUE_REFERENCE_TYPE,
VTC_FUNCTION_TYPE_RETURN,
VTC_ARRAY_TYPE_ELEMENT,
VTC_TYPE_OF_TYPE,
VTC_ELABORATED_TYPE,
VTC_PACK_EXPANSION_TYPE,
VTC_ATOMIC_TYPE,
VTC_PIPE_TYPE,
VTC_CXX_NEW_EXPR,
VTC_CXX_PSEUDO_DESTRUCTOR_EXPR_SCOPE,
VTC_CXX_PSEUDO_DESTRUCTOR_EXPR_DESTROYED,
VTC_CXX_SCALAR_VALUE_INIT_EXPR,
VTC_CXX_TYPEID_EXPR,
VTC_CXX_UNRESOLVED_CONSTRUCT_EXPR,
VTC_CXX_UUIDOF_EXPR,
VTC_CXX_TEMPORARY_OBJECT_EXPR,
VTC_EXPLICIT_CAST_EXPR,
VTC_COMPOUND_LITERAL_EXPR,
VTC_CONVERT_VECTOR_EXPR,
VTC_UNARY_EXPR_OR_TYPE_TRAIT_EXPR,
VTC_TEMPLATE_TYPE_ARGUMENT,
VTC_NESTED_NAME_SPECIFIER,
VTC_DECLARATION_NAME,
VTC_CONCEPTS_TYPE_REQUIREMENT,
);
return "unknown";
}
DEFINE_TOGDVALUE_USING_TOSTRING(VisitTypeContext)
char const *toString(VisitTemplateArgumentContext vtac)
{
ENUM_TABLE_LOOKUP_CHECK_SIZE(/*no qual*/, VisitTemplateArgumentContext,
NUM_VISIT_TEMPLATE_ARGUMENT_CONTEXTS, vtac,
VTAC_NONE,
VTAC_CLASS_TEMPLATE_PARTIAL_SPECIALIZATION_DECL,
#if CLANG_VERSION_MAJOR >= 18
VTAC_FUNCTION_DECL,
#else
VTAC_CLASS_SCOPE_FUNCTION_SPECIALIZATION_DECL,
#endif
VTAC_TEMPLATE_TEMPLATE_PARM_DECL_DEFAULT,
VTAC_TEMPLATE_SPECIALIZATION_TYPE,
VTAC_CXX_DEPENDENT_SCOPE_MEMBER_EXPR,
VTAC_DECL_REF_EXPR,
VTAC_DEPENDENT_SCOPE_DECL_REF_EXPR,
VTAC_MEMBER_EXPR,
);
return "unknown";
}
DEFINE_TOGDVALUE_USING_TOSTRING(VisitTemplateArgumentContext)
char const *toString(VisitNestedNameSpecifierContext vnnsc)
{
ENUM_TABLE_LOOKUP_CHECK_SIZE(/*no qual*/, VisitNestedNameSpecifierContext,
NUM_VISIT_NESTED_NAME_SPECIFIER_CONTEXTS, vnnsc,
VNNSC_NONE,
VNNSC_DECLARATOR_DECL,
VNNSC_ENUM_DECL,
VNNSC_RECORD_DECL,
VNNSC_USING_DECL,
VNNSC_ELABORATED_TYPE,
VNNSC_CXX_PSEUDO_DESTRUCTOR_EXPR,
VNNSC_DECL_REF_EXPR,
VNNSC_DEPENDENT_SCOPE_DECL_REF_EXPR,
VNNSC_MEMBER_EXPR,
);
return "unknown";
}
DEFINE_TOGDVALUE_USING_TOSTRING(VisitNestedNameSpecifierContext)
char const *toString(VisitDeclarationNameContext vdnc)
{
ENUM_TABLE_LOOKUP_CHECK_SIZE(/*no qual*/, VisitDeclarationNameContext,
NUM_VISIT_DECLARATION_NAME_CONTEXTS, vdnc,
VDNC_NONE,
VDNC_FUNCTION_DECL,
VDNC_DECL_REF_EXPR,
VDNC_DEPENDENT_SCOPE_DECL_REF_EXPR,
);
return "unknown";
}
DEFINE_TOGDVALUE_USING_TOSTRING(VisitDeclarationNameContext)
// Signal to the check-src Makefile target to stop here: END_OF_ENUMS.
// Without this, it would see call sites below that start with a context
// enumerator due to line wrapping.
ClangASTVisitor::ClangASTVisitor()
{}
void ClangASTVisitor::scanTU(clang::ASTContext &astContext)
{
visitDecl(VDC_NONE, astContext.getTranslationUnitDecl());
}
void ClangASTVisitor::visitDecl(
VisitDeclContext context,
clang::Decl const *decl)
{
// This function currently uses an else-if chain rather than a
// 'switch' statement for ease of understanding and maintenance. I
// envision, once it stabilizes, converting it to a 'switch'.
if (auto dd = dyn_cast<clang::DeclaratorDecl>(decl)) {
visitDeclaratorDeclOuterTemplateParameters(dd);
// To me, it makes more sense to visit the type before visiting the
// NNS since (in traditional syntax at least) the type syntactically
// precedes the NNS, but RecursiveASTVisitor visits the NNS first,
// and I want to match its behavior to make comparing them easier
// during testing, so I will visit the NNS first too.
visitNestedNameSpecifierLocOpt(VNNSC_DECLARATOR_DECL,
dd->getQualifierLoc());
if (auto fd = dyn_cast<clang::FunctionDecl>(decl)) {
// To match the RAV order, visit the DeclarationNameInfo of a
// FunctionDecl up here.
visitDeclarationNameInfo(VDNC_FUNCTION_DECL,
fd->getNameInfo());
visitFunctionDeclSpecializationInfo(fd);
}
// Note that visiting the type usually includes visiting the
// parameters if this is a declaration of a function.
visitDeclaratorDeclType(dd);
if (clang::Expr const *trailingRequires =
dd->getTrailingRequiresClause()) {
visitStmt(VSC_DECLARATOR_DECL_TRAILING_REQUIRES, trailingRequires);
}
if (auto vd = dyn_cast<clang::VarDecl>(decl)) {
if (clang::Expr const *init = vd->getInit()) {
visitStmt(VSC_VAR_DECL_INIT, init);
}
}
else if (auto fd = dyn_cast<clang::FunctionDecl>(decl)) {
if (!fd->getTypeSourceInfo()) {
// There is no TypeLoc, so the parameters do not get visited
// above. Visit them now.
//
// Originlly, this code checked 'isImplicit()', but the
// '__invoke' method on a lambda class that does *not* have any
// captures is considered 'isImplicit()' but it still has
// TypeSourceInfo.
//
// There might be a more principled approach. For the moment,
// I'm just trying to match what RAV does.
visitImplicitFunctionDeclParameters(fd);
}
if (auto ccd = dyn_cast<clang::CXXConstructorDecl>(decl)) {
if (ccd->doesThisDeclarationHaveABody()) {
visitCXXCtorInitializers(ccd);
}
}
// For CXXConversionDecl, the TypeLoc is in the return type of the
// function type, which is visited above as the declarator type.
// It is also in the DeclarationNameInfo, visited separately
// above.
if (fd->doesThisDeclarationHaveABody()) {
clang::Stmt const *body = fd->getBody();
assert(body);
visitStmt(VSC_FUNCTION_DECL_BODY, body);
}
}
else if (auto fd = dyn_cast<clang::FieldDecl>(decl)) {
if (clang::Expr const *width = fd->getBitWidth()) {
visitStmt(VSC_FIELD_DECL_BIT_WIDTH, width);
}
if (clang::Expr const *init = fd->getInClassInitializer()) {
visitStmt(VSC_FIELD_DECL_INIT, init);
}
}
else if (auto nttpd = dyn_cast<clang::NonTypeTemplateParmDecl>(decl)) {
if (nttpd->hasDefaultArgument() &&
!nttpd->defaultArgumentWasInherited()) {
visitStmt(VSC_NON_TYPE_TEMPLATE_PARM_DECL_DEFAULT,
nttpd->getDefaultArgument());
}
}
}
else if (auto ecd = dyn_cast<clang::EnumConstantDecl>(decl)) {
if (clang::Expr const *init = ecd->getInitExpr()) {
visitStmt(VSC_ENUM_CONSTANT_DECL, init);
}
}
else if (auto tnd = dyn_cast<clang::TypedefNameDecl>(decl)) {
visitTypeSourceInfo(VTC_TYPEDEF_NAME_DECL, tnd->getTypeSourceInfo());
// TypeAliasDecl carries a 'Template' pointer, but I think that
// points to a parent AST node, and consequently we should not visit
// it.
}
// Both EnumDecl and RecordDecl inherit TagDecl, but they visit their
// NestedNameSpecifiers in different places (for RAV compatibility),
// so I can't easily combine their cases. And, splitting them
// provides an opportunity to refine the NNS context slightly.
else if (auto ed = dyn_cast<clang::EnumDecl>(decl)) {
visitTagDeclOuterTemplateParameters(ed);
visitNestedNameSpecifierLocOpt(VNNSC_ENUM_DECL, ed->getQualifierLoc());
if (clang::TypeSourceInfo const *tsi = ed->getIntegerTypeSourceInfo()) {
visitTypeLoc(VTC_ENUM_DECL_UNDERLYING, tsi->getTypeLoc());
}
else {
// The declaration does not have an underlying type declared.
}
if (ed->isThisDeclarationADefinition()) {
visitNonFunctionDeclContext(VDC_ENUM_DECL, DECL_CONTEXT_OF(ed));
}
}
else if (auto rd = dyn_cast<clang::RecordDecl>(decl)) {
bool const isDefn = rd->isThisDeclarationADefinition();
if (auto crd = dyn_cast<clang::CXXRecordDecl>(decl)) {
if (auto ctsd = dyn_cast<
clang::ClassTemplateSpecializationDecl>(crd)) {
if (auto ctpsd = dyn_cast<
clang::ClassTemplatePartialSpecializationDecl>(decl)) {
visitTemplateDeclParameterList(
ctpsd->getTemplateParameters());
if (false) {
// CTPSD has 'ArgsAsWritten' that are redundant with the
// 'TypeAsWritten'. Do not visit the former.
visitASTTemplateArgumentListInfo(
VTAC_CLASS_TEMPLATE_PARTIAL_SPECIALIZATION_DECL,
ctpsd->getTemplateArgsAsWritten());
}
// Visit 'TypeAsWritten', but with a special context so I
// can behave like RAV when needed.
visitTypeSourceInfoOpt(
VTC_CLASS_TEMPLATE_PARTIAL_SPECIALIZATION_DECL,
ctsd->getTypeAsWritten());
}
else /*full specialization*/ {
visitTypeSourceInfoOpt(
VTC_CLASS_TEMPLATE_SPECIALIZATION_DECL,
ctsd->getTypeAsWritten());
}
}
}
// It would make much more sense to visit the outer parameters
// before the inner parameters, but RAV does it here.
visitTagDeclOuterTemplateParameters(rd);
// RAV prints the NNS after the template parameters and arguments.
// Syntactically, it appears between them, but RAV compatibility
// is important for my testing strategy. (It would also be a bit
// awkward to insert the NNS in there, which is presumably why RAV
// does what it does in this regard.)
visitNestedNameSpecifierLocOpt(VNNSC_RECORD_DECL, rd->getQualifierLoc());
// CXXRecord has two sections to handle it because that is needed
// to match the RAV visitation order.
if (auto crd = dyn_cast<clang::CXXRecordDecl>(decl)) {
if (isDefn) {
visitCXXRecordBases(crd);
}
}
if (isDefn) {
visitNonFunctionDeclContext(VDC_RECORD_DECL, DECL_CONTEXT_OF(rd));
}
} // RecordDecl
else if (auto fsad = dyn_cast<clang::FileScopeAsmDecl>(decl)) {
visitStmt(VSC_FILE_SCOPE_ASM_DECL_STRING, fsad->getAsmString());
}
// BlockDecl is ObjC I think.
// TODO: CapturedDecl
// TODO: CXXDeductionGuideDecl?
// TODO: BindingDecl, DecompositionDecl
else if (auto td = dyn_cast<clang::TemplateDecl>(decl)) {
visitTemplateDeclParameterList(td->getTemplateParameters());
// The templated decl is missing in the case of a
// TemplateTemplateParmDecl.
visitDeclOpt(VDC_TEMPLATE_DECL, td->getTemplatedDecl());
visitTemplateInstantiationsIfCanonical(td);
if (auto ttpd = dyn_cast<clang::TemplateTemplateParmDecl>(decl)) {
if (ttpd->hasDefaultArgument() &&
!ttpd->defaultArgumentWasInherited()) {
visitTemplateArgumentLoc(VTAC_TEMPLATE_TEMPLATE_PARM_DECL_DEFAULT,
ttpd->getDefaultArgument());
}
}
}
else if (auto fd = dyn_cast<clang::FriendDecl>(decl)) {
clang::TypeSourceInfo const *tsi = fd->getFriendType();
if (tsi) {
visitTypeLoc(VTC_FRIEND_DECL, tsi->getTypeLoc());
}
else {
clang::NamedDecl const *inner = fd->getFriendDecl();
visitDecl(VDC_FRIEND_DECL, inner);
}
}
// The documentation for FriendTemplateDecl says it is not used, and
// the test at in/src/friend-template-decl.cc appears to confirm that.
// So the following case is never exercised.
else if (auto ftd = dyn_cast<clang::FriendTemplateDecl>(decl)) {
clang::TypeSourceInfo const *tsi = ftd->getFriendType();
if (tsi) {
visitTypeLoc(VTC_FRIEND_TEMPLATE_DECL, tsi->getTypeLoc());
}
else {
clang::NamedDecl const *inner = ftd->getFriendDecl();
visitDecl(VDC_FRIEND_TEMPLATE_DECL, inner);
}
}
#if CLANG_VERSION_MAJOR < 18
else if (auto csfsd = dyn_cast<
clang::ClassScopeFunctionSpecializationDecl>(decl)) {
// Visit the specialization class.
visitDecl(
VDC_CLASS_SCOPE_FUNCTION_SPECIALIZATION_DECL,
csfsd->getSpecialization());
// Visit the template arguments.
visitASTTemplateArgumentListInfoOpt(
VTAC_CLASS_SCOPE_FUNCTION_SPECIALIZATION_DECL,
csfsd->getTemplateArgsAsWritten());
}
#endif
else if (auto ttpd = dyn_cast<clang::TemplateTypeParmDecl>(decl)) {
// TODO: Type constraint?
// Visit the default argument if it is syntactically present.
if (ttpd->hasDefaultArgument() &&
!ttpd->defaultArgumentWasInherited()) {
visitTypeSourceInfo(VTC_TEMPLATE_TYPE_PARM_DECL_DEFAULT,
ttpd->getDefaultArgumentInfo());
}
}
else if (auto ed = dyn_cast<clang::ExportDecl>(decl)) {
visitNonFunctionDeclContext(VDC_EXPORT_DECL, DECL_CONTEXT_OF(ed));
}
else if (auto eccd = dyn_cast<clang::ExternCContextDecl>(decl)) {
visitNonFunctionDeclContext(VDC_EXTERN_C_DECL, DECL_CONTEXT_OF(eccd));
}
else if (auto lsd = dyn_cast<clang::LinkageSpecDecl>(decl)) {
visitNonFunctionDeclContext(VDC_LINKAGE_SPEC_DECL, DECL_CONTEXT_OF(lsd));
}
else if (auto nsd = dyn_cast<clang::NamespaceDecl>(decl)) {
visitNonFunctionDeclContext(VDC_NAMESPACE_DECL, DECL_CONTEXT_OF(nsd));
}
else if (auto rebd = dyn_cast<clang::RequiresExprBodyDecl>(decl)) {
visitNonFunctionDeclContext(VDC_REQUIRES_EXPR_BODY_DECL, DECL_CONTEXT_OF(rebd));
}
else if (auto tud = dyn_cast<clang::TranslationUnitDecl>(decl)) {
visitNonFunctionDeclContext(VDC_TRANSLATION_UNIT_DECL, DECL_CONTEXT_OF(tud));
}
else if (auto ud = dyn_cast<clang::UsingDecl>(decl)) {
visitNestedNameSpecifierLocOpt(VNNSC_USING_DECL, ud->getQualifierLoc());
}
else {
// Ignore others.
}
}
void ClangASTVisitor::visitStmt(VisitStmtContext context,
clang::Stmt const *origStmt)
{
// The order of cases in this 'switch' statement is meant to
// correspond to the numeric order of the 'Stmt::StmtClass'
// enumerators except where adjustment is needed because of the
// class hierarchy.
switch (origStmt->getStmtClass()) {
// Start handling a particular class. This deliberately opens a
// compound statement that it does not close.
#define BEGIN_STMT_CLASS(Subclass) \
case clang::Stmt::Subclass##Class: { \
clang::Subclass const *stmt = \
assert_dyn_cast(clang::Subclass, origStmt);
// End the handling of a class, closing its compound statement.
#define END_STMT_CLASS \
break; \
}
// End the previous case and start a new one.
#define HANDLE_STMT_CLASS(Subclass) \
END_STMT_CLASS \
BEGIN_STMT_CLASS(Subclass)
// Begin a case that does not require any code.
#define BEGIN_NOOP_STMT_CLASS(Subclass) \
case clang::Stmt::Subclass##Class: {
// Handle a noop case in the middle of the chain.
#define HANDLE_NOOP_STMT_CLASS(Subclass) \
END_STMT_CLASS \
BEGIN_NOOP_STMT_CLASS(Subclass)
// A class whose handling is the same as what follows it. You have
// to explicitly end the previous class first, and follow this with
// BEGIN rather than HANDLE.
#define ADDITIONAL_STMT_CLASS(Subclass) \
case clang::Stmt::Subclass##Class:
// After a series of ADDITIONAL_STMT_CLASS, this begins handling
// them all as the indicated superclass. It does not have its own
// case label because the abstract superclasses do not have their
// own codes, as they are never instantiated.
#define BEGIN_STMT_ABSTRACT_SUPERCLASS(Superclass) \
/*relevant cases come before this*/ { \
clang::Superclass const *stmt = \
assert_dyn_cast(clang::Superclass, origStmt);
// Although the AsmStmt subclasses contain string literals, their
// semantics are completely different from other kinds of string
// literals, so I think it's best to not recursively traverse into
// it.
BEGIN_NOOP_STMT_CLASS(GCCAsmStmt)
HANDLE_NOOP_STMT_CLASS(MSAsmStmt)
HANDLE_NOOP_STMT_CLASS(BreakStmt)
HANDLE_STMT_CLASS(CXXCatchStmt)
// Optional because there is no declaration for `catch (...)`.
visitDeclOpt(VDC_CXX_CATCH_STMT, stmt->getExceptionDecl());
visitStmt (VSC_CXX_CATCH_STMT, stmt->getHandlerBlock());
HANDLE_STMT_CLASS(CXXForRangeStmt)
// I don't know what all of these sub-expressions mean, so I don't
// know if it makes sense to visit them all. This is just a first
// attempt.
visitStmtOpt(VSC_CXX_FOR_RANGE_STMT_INIT, stmt->getInit());
visitStmtOpt(VSC_CXX_FOR_RANGE_STMT_RANGE, stmt->getRangeStmt());
visitStmtOpt(VSC_CXX_FOR_RANGE_STMT_BEGIN, stmt->getBeginStmt());
visitStmtOpt(VSC_CXX_FOR_RANGE_STMT_END, stmt->getEndStmt());
visitStmtOpt(VSC_CXX_FOR_RANGE_STMT_COND, stmt->getCond());
visitStmtOpt(VSC_CXX_FOR_RANGE_STMT_INC, stmt->getInc());
visitStmtOpt(VSC_CXX_FOR_RANGE_STMT_LOOPVAR, stmt->getLoopVarStmt());
visitStmtOpt(VSC_CXX_FOR_RANGE_STMT_BODY, stmt->getBody());
HANDLE_STMT_CLASS(CXXTryStmt)
visitStmt(VSC_CXX_TRY_STMT_TRY_BLOCK, stmt->getTryBlock());
visitCXXTryStmtHandlers(stmt);
// TODO: HANDLE_STMT_CLASS(CapturedStmt)
HANDLE_STMT_CLASS(CompoundStmt)
visitCompoundStmtBody(stmt);
HANDLE_NOOP_STMT_CLASS(ContinueStmt)
// TODO: HANDLE_STMT_CLASS(CoreturnStmt)
// TODO: HANDLE_STMT_CLASS(CoroutineBodyStmt)
HANDLE_STMT_CLASS(DeclStmt)
visitDeclStmtDecls(stmt);
HANDLE_STMT_CLASS(DoStmt)
visitStmt(VSC_DO_STMT_BODY, stmt->getBody());
visitStmt(VSC_DO_STMT_COND, stmt->getCond());
HANDLE_STMT_CLASS(ForStmt)
visitStmtOpt(VSC_FOR_STMT_INIT, stmt->getInit());
visitStmtOpt(VSC_FOR_STMT_CONDVAR, stmt->getConditionVariableDeclStmt());
visitStmtOpt(VSC_FOR_STMT_COND, stmt->getCond());
visitStmtOpt(VSC_FOR_STMT_INC, stmt->getInc());
visitStmt (VSC_FOR_STMT_BODY, stmt->getBody());
HANDLE_NOOP_STMT_CLASS(GotoStmt)
HANDLE_STMT_CLASS(IfStmt)
visitStmtOpt(VSC_IF_STMT_INIT, stmt->getInit());
visitStmtOpt(VSC_IF_STMT_CONDVAR, stmt->getConditionVariableDeclStmt());
visitStmt (VSC_IF_STMT_COND, stmt->getCond());
visitStmt (VSC_IF_STMT_THEN, stmt->getThen());
visitStmtOpt(VSC_IF_STMT_ELSE, stmt->getElse());
HANDLE_STMT_CLASS(IndirectGotoStmt)
visitStmt(VSC_INDIRECT_GOTO_STMT, stmt->getTarget());
// TODO: HANDLE_STMT_CLASS(MSDependentExistsStmt)
HANDLE_NOOP_STMT_CLASS(NullStmt)
// TODO: All the OMP* statements.
// TODO: All the ObjC* statements.
HANDLE_STMT_CLASS(ReturnStmt)
visitStmtOpt(VSC_RETURN_STMT_VALUE, stmt->getRetValue());
visitDeclOpt(VDC_RETURN_STMT_NRVO_CANDIDATE, stmt->getNRVOCandidate());
// TODO: SEHExceptStmt
// TODO: SEHFinallyStmt
// TODO: SEHLeaveStmt
// TODO: SEHTryStmt
HANDLE_STMT_CLASS(CaseStmt)
visitStmt (VSC_CASE_STMT_LHS, stmt->getLHS());
visitStmtOpt(VSC_CASE_STMT_RHS, stmt->getRHS());
visitStmt (VSC_CASE_STMT_SUB, stmt->getSubStmt());
HANDLE_STMT_CLASS(DefaultStmt)
visitStmt(VSC_DEFAULT_STMT, stmt->getSubStmt());
HANDLE_STMT_CLASS(SwitchStmt)
visitStmtOpt(VSC_SWITCH_STMT_INIT, stmt->getInit());
visitStmtOpt(VSC_SWITCH_STMT_CONDVAR, stmt->getConditionVariableDeclStmt());
visitStmt (VSC_SWITCH_STMT_COND, stmt->getCond());
visitStmt (VSC_SWITCH_STMT_BODY, stmt->getBody());
HANDLE_STMT_CLASS(AttributedStmt)
// TODO: Visit the attributes.
visitStmt(VSC_ATTRIBUTED_STMT, stmt->getSubStmt());
HANDLE_STMT_CLASS(BinaryConditionalOperator)
visitStmt(VSC_BINARY_CONDITIONAL_OPERATOR_COMMON,
stmt->getCommon());
visitStmt(VSC_BINARY_CONDITIONAL_OPERATOR_COND,
stmt->getCond());
visitStmt(VSC_BINARY_CONDITIONAL_OPERATOR_TRUE,
stmt->getTrueExpr());
visitStmt(VSC_BINARY_CONDITIONAL_OPERATOR_FALSE,
stmt->getFalseExpr());
HANDLE_STMT_CLASS(ConditionalOperator)
visitStmt(VSC_CONDITIONAL_OPERATOR_COND, stmt->getCond());
visitStmt(VSC_CONDITIONAL_OPERATOR_TRUE, stmt->getTrueExpr());
visitStmt(VSC_CONDITIONAL_OPERATOR_FALSE, stmt->getFalseExpr());
// This class has a pointer to a LabelDecl, but the LabelDecl is not
// a child, as it is defined elsewhere. This is merely a reference
// to that label. Consequently, I do not traverse into it.
HANDLE_NOOP_STMT_CLASS(AddrLabelExpr)
// This expression represents the "current index" within an
// ArrayInitLoopExpr. It does not carry any information other than
// its identity as the expression playing that role.
HANDLE_NOOP_STMT_CLASS(ArrayInitIndexExpr)
HANDLE_STMT_CLASS(ArrayInitLoopExpr)
visitStmt(VSC_ARRAY_INIT_LOOP_EXPR_COMMON, stmt->getCommonExpr());
visitStmt(VSC_ARRAY_INIT_LOOP_EXPR_SUB, stmt->getSubExpr());
HANDLE_STMT_CLASS(ArraySubscriptExpr)
// I choose to visit in syntactic order because a visitor is not
// likely to be helped by the base/index ordering.
visitStmt(VSC_ARRAY_SUBSCRIPT_EXPR_LHS, stmt->getLHS());
visitStmt(VSC_ARRAY_SUBSCRIPT_EXPR_RHS, stmt->getRHS());
// TODO: ArrayTypeTraitExpr
HANDLE_STMT_CLASS(AsTypeExpr)
visitStmt(VSC_AS_TYPE_EXPR, stmt->getSrcExpr());
// TODO: AtomicExpr
// CompoundAssignOperator is a subclass of BinaryOperator that adds
// some results of semantic analysis but no new syntax.
END_STMT_CLASS
ADDITIONAL_STMT_CLASS(CompoundAssignOperator)
BEGIN_STMT_CLASS(BinaryOperator)
visitStmt(VSC_BINARY_OPERATOR_LHS, stmt->getLHS());
visitStmt(VSC_BINARY_OPERATOR_RHS, stmt->getRHS());
// TODO: BlockExpr
HANDLE_STMT_CLASS(CXXBindTemporaryExpr)
// The contained 'CXXTemporary' doesn't have recursive structure,
// so I don't think it needs to be visited.
visitStmt(VSC_CXX_BIND_TEMPORARY_EXPR, stmt->getSubExpr());
HANDLE_NOOP_STMT_CLASS(CXXBoolLiteralExpr)
HANDLE_STMT_CLASS(CXXConstructExpr)
visitCXXConstructExprArgs(stmt);
// This is a subclass of 'CXXConstructExpr', so could be folded into
// the case above, but doing so would be messier than repeating one
// line of code.
HANDLE_STMT_CLASS(CXXTemporaryObjectExpr)
visitTypeSourceInfo(VTC_CXX_TEMPORARY_OBJECT_EXPR, stmt->getTypeSourceInfo());
visitCXXConstructExprArgs(stmt);
HANDLE_NOOP_STMT_CLASS(CXXDefaultArgExpr)
// This has a pointer to elsewhere in the AST, but the pointee is
// not a descendant of this node.
HANDLE_STMT_CLASS(CXXDefaultInitExpr)
visitCXXDefaultInitExpr(stmt);
HANDLE_STMT_CLASS(CXXDeleteExpr)
visitStmt(VSC_CXX_DELETE_EXPR, stmt->getArgument());
HANDLE_STMT_CLASS(CXXDependentScopeMemberExpr)
if (!stmt->isImplicitAccess()) {
visitStmt(VSC_CXX_DEPENDENT_SCOPE_MEMBER_EXPR_BASE,
stmt->getBase());
}
// TODO: visitNestedNameSpecifierLoc(stmt->getQualifierLoc());
visitTemplateArgumentLocArray(
VTAC_CXX_DEPENDENT_SCOPE_MEMBER_EXPR,
stmt->getTemplateArgs(),
stmt->getNumTemplateArgs());
HANDLE_STMT_CLASS(CXXFoldExpr)
// TODO: I ran into a case
// (`header-analysis/in/src/int32-via-memory.h`) where the callee
// was `nullptr`, so I now tolerate all of them being null. I
// should figure out what actually is possible.
visitStmtOpt(VSC_CXX_FOLD_EXPR_CALLEE, stmt->getCallee());
visitStmtOpt(VSC_CXX_FOLD_EXPR_LHS, stmt->getLHS());
visitStmtOpt(VSC_CXX_FOLD_EXPR_RHS, stmt->getRHS());
HANDLE_NOOP_STMT_CLASS(CXXInheritedCtorInitExpr)
HANDLE_STMT_CLASS(CXXNewExpr)
visitTypeSourceInfo(VTC_CXX_NEW_EXPR,
stmt->getAllocatedTypeSourceInfo());
if (stmt->isArray()) {
visitStmt(VSC_CXX_NEW_EXPR_ARRAY_SIZE,
*(stmt->getArraySize()));
}
if (stmt->hasInitializer()) {
visitStmt(VSC_CXX_NEW_EXPR_INIT,
stmt->getInitializer());
}
visitCXXNewExprPlacementArgs(stmt);
HANDLE_STMT_CLASS(CXXNoexceptExpr)
visitStmt(VSC_CXX_NOEXCEPT_EXPR,
stmt->getOperand());
HANDLE_NOOP_STMT_CLASS(CXXNullPtrLiteralExpr)
// TODO: CXXParenListInitExpr (C++20 feature)
HANDLE_STMT_CLASS(CXXPseudoDestructorExpr)
visitStmt(
VSC_CXX_PSEUDO_DESTRUCTOR_EXPR,
stmt->getBase());
visitNestedNameSpecifierLocOpt(
VNNSC_CXX_PSEUDO_DESTRUCTOR_EXPR,
stmt->getQualifierLoc());
visitTypeSourceInfoOpt(
VTC_CXX_PSEUDO_DESTRUCTOR_EXPR_SCOPE,
stmt->getScopeTypeInfo());
visitTypeSourceInfoOpt(
VTC_CXX_PSEUDO_DESTRUCTOR_EXPR_DESTROYED,
stmt->getDestroyedTypeInfo());
// TODO: CXXRewrittenBinaryOperator (C++20 feature)
HANDLE_STMT_CLASS(CXXScalarValueInitExpr)
visitTypeSourceInfo(VTC_CXX_SCALAR_VALUE_INIT_EXPR,
stmt->getTypeSourceInfo());
HANDLE_STMT_CLASS(CXXStdInitializerListExpr)
visitStmt(VSC_CXX_STD_INITIALIZER_LIST_EXPR,
stmt->getSubExpr());
HANDLE_NOOP_STMT_CLASS(CXXThisExpr)
HANDLE_STMT_CLASS(CXXThrowExpr)
visitStmtOpt(VSC_CXX_THROW_EXPR,
stmt->getSubExpr());
HANDLE_STMT_CLASS(CXXTypeidExpr)
if (stmt->isTypeOperand()) {
visitTypeSourceInfo(VTC_CXX_TYPEID_EXPR,
stmt->getTypeOperandSourceInfo());
}
else {
visitStmt(VSC_CXX_TYPEID_EXPR,
stmt->getExprOperand());
}
HANDLE_STMT_CLASS(CXXUnresolvedConstructExpr)
visitTypeSourceInfo(VTC_CXX_UNRESOLVED_CONSTRUCT_EXPR,
stmt->getTypeSourceInfo());
visitCXXUnresolvedConstructExprArgs(stmt);
HANDLE_STMT_CLASS(CXXUuidofExpr)
if (stmt->isTypeOperand()) {
visitTypeSourceInfo(VTC_CXX_UUIDOF_EXPR,
stmt->getTypeOperandSourceInfo());
}
else {
visitStmt(VSC_CXX_UUIDOF_EXPR,
stmt->getExprOperand());
}
END_STMT_CLASS
ADDITIONAL_STMT_CLASS(CUDAKernelCallExpr) // TODO: This is incomplete, there is the "config" too.
ADDITIONAL_STMT_CLASS(CXXMemberCallExpr)
ADDITIONAL_STMT_CLASS(CXXOperatorCallExpr)
ADDITIONAL_STMT_CLASS(UserDefinedLiteral)
BEGIN_STMT_CLASS(CallExpr)
visitStmt(VSC_CALL_EXPR_CALLEE, stmt->getCallee());
visitCallExprArgs(stmt);
END_STMT_CLASS
ADDITIONAL_STMT_CLASS(BuiltinBitCastExpr)
ADDITIONAL_STMT_CLASS(CStyleCastExpr)
ADDITIONAL_STMT_CLASS(CXXFunctionalCastExpr)
ADDITIONAL_STMT_CLASS(CXXAddrspaceCastExpr)
ADDITIONAL_STMT_CLASS(CXXConstCastExpr)
ADDITIONAL_STMT_CLASS(CXXDynamicCastExpr)