Support for OCaml native debugging

[ebtaleb]

Summary

This introduces basic support for debugging OCaml binaries.
Use of the native compiler with DWARF emission support (see https://github.com/ocaml/ocaml/pull/574) is required.

Available variables are considered as 64 bits unsigned integers, their interpretation will be left to a OCaml-made debugging layer.

[clayborg]

Just a few fixes and this will be ready.

include/lldb/lldb-forward.h

147 ↗

(On Diff #63210)

You shouldn't have to add this into lldb-forward.h

368 ↗

(On Diff #63210)

You shouldn't have to add this into lldb-forward.h

source/Plugins/Language/OCaml/CMakeLists.txt

5

Add newline

[ebtaleb]

source/Plugins/SymbolFile/DWARF/SymbolFileDWARF.cpp

4315 ↗

(On Diff #63210)

From what I understood, when calculating addresses using location lists,
the location slide is computed as the absolute distance
between the function low PC and the CU low PC.

Then, in DWARFExpression, when testing whether a variable is available at a given PC,
the Evaluate method computes the absolute address ranges of the location list
(location list offset - location list slide + function base address) and test if
the current PC falls into that range.

The naive solution here is not maintainable here.

Is the default behaviour due to something specific to the way Clang generates
location list offsets?

What is the use of location slides when calculating location list addresses?
Can I overwrite location slide setting with a custom DWARF parser?
Or should I include the slide offset in the location list generation in the compiler itself?

[clayborg]

Looks good.

[ebtaleb]

This comment was removed by ebtaleb.

[tberghammer]

Do you want me to commit it in for you?

[ebtaleb]

In D22132#502204, @tberghammer wrote:

Do you want me to commit it in for you?

Sure, if you don't mind. Thank you.

cmake/LLDBDependencies.cmake

   lldbPluginJavaLanguage
   lldbPluginObjCLanguage
   lldbPluginObjCPlusPlusLanguage
+  lldbPluginOCamlLanguage
 
   lldbPluginObjectFileELF
   lldbPluginObjectFileJIT

include/lldb/Symbol/OCamlASTContext.h

+//===-- OCamlASTContext.h ------------------------------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef liblldb_OCamlASTContext_h_
+#define liblldb_OCamlASTContext_h_
+
+// C Includes
+// C++ Includes
+#include <map>
+#include <memory>
+#include <set>
+#include <string>
+#include <vector>
+
+// Other libraries and framework includes
+// Project includes
+#include "lldb/Core/ConstString.h"
+#include "lldb/Symbol/TypeSystem.h"
+#include "lldb/Symbol/CompilerType.h"
+
+namespace lldb_private
+{
+
+class OCamlASTContext : public TypeSystem
+{
+  public:
+    class OCamlType;
+    typedef std::map<ConstString, std::unique_ptr<OCamlType>> OCamlTypeMap;
+
+    OCamlASTContext();
+    ~OCamlASTContext() override;
+
+    ConstString
+    GetPluginName() override;
+
+    uint32_t
+    GetPluginVersion() override;
+
+    static ConstString
+    GetPluginNameStatic ();
+
+    static lldb::TypeSystemSP
+    CreateInstance (lldb::LanguageType language, Module *module, Target *target);
+
+    static void
+    EnumerateSupportedLanguages(std::set<lldb::LanguageType> &languages_for_types,
+                                std::set<lldb::LanguageType> &languages_for_expressions);
+
+    static void
+    Initialize ();
+
+    static void
+    Terminate ();
+
+    DWARFASTParser *GetDWARFParser() override;
+
+    void
+    SetAddressByteSize(int byte_size)
+    {
+        m_pointer_byte_size = byte_size;
+    }
+
+    static bool classof(const TypeSystem *ts)
+    {
+        return ts->getKind() == TypeSystem::eKindOCaml;
+    }
+
+    ConstString
+    DeclGetName (void *opaque_decl) override
+    {
+        return ConstString();
+    }
+
+    bool
+    DeclContextIsStructUnionOrClass(void *opaque_decl_ctx) override
+    {
+        return false;
+    }
+
+    ConstString
+    DeclContextGetName(void *opaque_decl_ctx) override
+    {
+        return ConstString();
+    }
+
+    ConstString
+    DeclContextGetScopeQualifiedName(void *opaque_decl_ctx) override
+    {
+        return ConstString();
+    }
+
+    bool
+    DeclContextIsClassMethod(void *opaque_decl_ctx, lldb::LanguageType *language_ptr,
+                             bool *is_instance_method_ptr,
+                             ConstString *language_object_name_ptr) override
+    {
+        return false;
+    }
+
+    bool SupportsLanguage (lldb::LanguageType language) override;
+    uint32_t GetPointerByteSize() override;
+
+    bool
+    IsArrayType(lldb::opaque_compiler_type_t type, CompilerType *element_type, 
+                uint64_t *size, bool *is_incomplete) override;
+
+    bool IsAggregateType(lldb::opaque_compiler_type_t type) override;
+
+    bool IsCharType(lldb::opaque_compiler_type_t type) override;
+
+    bool IsCompleteType(lldb::opaque_compiler_type_t type) override;
+
+    bool IsDefined(lldb::opaque_compiler_type_t type) override;
+
+    bool IsFloatingPointType(lldb::opaque_compiler_type_t type, uint32_t &count, bool &is_complex) override;
+
+    bool IsFunctionType(lldb::opaque_compiler_type_t type, bool *is_variadic_ptr = nullptr) override;
+
+    size_t GetNumberOfFunctionArguments(lldb::opaque_compiler_type_t type) override;
+
+    CompilerType GetFunctionArgumentAtIndex(lldb::opaque_compiler_type_t type, const size_t index) override;
+
+    bool IsFunctionPointerType(lldb::opaque_compiler_type_t type) override;
+
+    bool IsBlockPointerType (lldb::opaque_compiler_type_t type, 
+                             CompilerType *function_pointer_type_ptr) override;
+
+    bool 
+    IsIntegerType(lldb::opaque_compiler_type_t type, bool &is_signed) override;
+
+    bool
+    IsPossibleDynamicType(lldb::opaque_compiler_type_t type,
+                               CompilerType *target_type,
+                               bool check_cplusplus, bool check_objc) override;
+
+    bool IsPointerType(lldb::opaque_compiler_type_t type, CompilerType *pointee_type = nullptr) override;
+
+    bool IsScalarType(lldb::opaque_compiler_type_t type) override;
+
+    bool IsVoidType(lldb::opaque_compiler_type_t type) override;
+
+    bool GetCompleteType(lldb::opaque_compiler_type_t type) override;
+
+    ConstString GetTypeName(lldb::opaque_compiler_type_t type) override;
+
+    uint32_t
+    GetTypeInfo(lldb::opaque_compiler_type_t type,
+                CompilerType *pointee_or_element_compiler_type = nullptr) override;
+
+    lldb::LanguageType GetMinimumLanguage(lldb::opaque_compiler_type_t type) override;
+
+    lldb::TypeClass GetTypeClass(lldb::opaque_compiler_type_t type) override;
+
+    CompilerType
+    GetArrayElementType(lldb::opaque_compiler_type_t type, uint64_t *stride = nullptr) override;
+
+    CompilerType GetCanonicalType(lldb::opaque_compiler_type_t type) override;
+
+    int GetFunctionArgumentCount(lldb::opaque_compiler_type_t type) override;
+
+    CompilerType
+    GetFunctionArgumentTypeAtIndex(lldb::opaque_compiler_type_t type, size_t idx) override;
+
+    CompilerType
+    GetFunctionReturnType(lldb::opaque_compiler_type_t type) override;
+
+    size_t
+    GetNumMemberFunctions(lldb::opaque_compiler_type_t type) override;
+
+    TypeMemberFunctionImpl
+    GetMemberFunctionAtIndex(lldb::opaque_compiler_type_t type, size_t idx) override;
+
+    CompilerType
+    GetPointeeType(lldb::opaque_compiler_type_t type) override;
+
+    CompilerType
+    GetPointerType(lldb::opaque_compiler_type_t type) override;
+
+    uint64_t
+    GetBitSize(lldb::opaque_compiler_type_t type, ExecutionContextScope *exe_scope) override;
+
+    lldb::Encoding
+    GetEncoding(lldb::opaque_compiler_type_t type, uint64_t &count) override;
+
+    lldb::Format
+    GetFormat(lldb::opaque_compiler_type_t type) override;
+
+    uint32_t
+    GetNumChildren(lldb::opaque_compiler_type_t type, bool omit_empty_base_classes) override;
+
+    lldb::BasicType
+    GetBasicTypeEnumeration(lldb::opaque_compiler_type_t type) override;
+
+    CompilerType
+    GetBuiltinTypeForEncodingAndBitSize(lldb::Encoding encoding, size_t bit_size) override;
+
+    uint32_t
+    GetNumFields(lldb::opaque_compiler_type_t type) override;
+
+    CompilerType
+    GetFieldAtIndex(lldb::opaque_compiler_type_t type, size_t idx, std::string &name, uint64_t *bit_offset_ptr, 
+                    uint32_t *bitfield_bit_size_ptr, bool *is_bitfield_ptr) override;
+
+    uint32_t
+    GetNumDirectBaseClasses(lldb::opaque_compiler_type_t type) override
+    {
+        return 0;
+    }
+
+    uint32_t
+    GetNumVirtualBaseClasses(lldb::opaque_compiler_type_t type) override
+    {
+        return 0;
+    }
+
+    CompilerType
+    GetDirectBaseClassAtIndex(lldb::opaque_compiler_type_t type, size_t idx, uint32_t *bit_offset_ptr) override
+    {
+        return CompilerType();
+    }
+
+    CompilerType
+    GetVirtualBaseClassAtIndex(lldb::opaque_compiler_type_t type, size_t idx, uint32_t *bit_offset_ptr) override
+    {
+        return CompilerType();
+    }
+
+    CompilerType 
+    GetChildCompilerTypeAtIndex(lldb::opaque_compiler_type_t type,
+                                ExecutionContext *exe_ctx, size_t idx,
+                                bool transparent_pointers, bool omit_empty_base_classes,
+                                bool ignore_array_bounds, std::string &child_name,
+                                uint32_t &child_byte_size, int32_t &child_byte_offset,
+                                uint32_t &child_bitfield_bit_size,
+                                uint32_t &child_bitfield_bit_offset, bool &child_is_base_class,
+                                bool &child_is_deref_of_parent, ValueObject *valobj,
+                                uint64_t &language_flags) override;
+
+    uint32_t 
+    GetIndexOfChildWithName(lldb::opaque_compiler_type_t type, const char *name, bool omit_empty_base_classes) override;
+
+    size_t
+    GetIndexOfChildMemberWithName(lldb::opaque_compiler_type_t type,
+                                  const char *name, bool omit_empty_base_classes,
+                                  std::vector<uint32_t> &child_indexes) override;
+
+    size_t
+    GetNumTemplateArguments(lldb::opaque_compiler_type_t type) override
+    {
+        return 0;
+    }
+
+    CompilerType
+    GetTemplateArgument(lldb::opaque_compiler_type_t type,
+                        size_t idx, lldb::TemplateArgumentKind &kind) override
+    {
+        return CompilerType();
+    }
+
+    void DumpValue(lldb::opaque_compiler_type_t type, ExecutionContext *exe_ctx,
+                   Stream *s, lldb::Format format, const DataExtractor &data, 
+                   lldb::offset_t data_offset, size_t data_byte_size,
+                   uint32_t bitfield_bit_size, uint32_t bitfield_bit_offset,
+                   bool show_types, bool show_summary,
+                   bool verbose, uint32_t depth) override;
+
+    bool DumpTypeValue(lldb::opaque_compiler_type_t type, Stream *s,
+                       lldb::Format format, const DataExtractor &data,
+                       lldb::offset_t data_offset, size_t data_byte_size,
+                       uint32_t bitfield_bit_size, uint32_t bitfield_bit_offset,
+                       ExecutionContextScope *exe_scope) override;
+
+    void
+    DumpTypeDescription(lldb::opaque_compiler_type_t type) override;
+
+    void
+    DumpTypeDescription(lldb::opaque_compiler_type_t type, Stream *s) override;
+
+    bool IsRuntimeGeneratedType(lldb::opaque_compiler_type_t type) override;
+
+    void 
+    DumpSummary(lldb::opaque_compiler_type_t type, ExecutionContext *exe_ctx,
+                Stream *s, const DataExtractor &data,
+                lldb::offset_t data_offset, size_t data_byte_size) override;
+
+    size_t 
+    ConvertStringToFloatValue(lldb::opaque_compiler_type_t type, const char *s,
+                              uint8_t *dst, size_t dst_size) override;
+
+    bool IsPointerOrReferenceType(lldb::opaque_compiler_type_t type,
+                                  CompilerType *pointee_type = nullptr) override;
+
+    unsigned GetTypeQualifiers(lldb::opaque_compiler_type_t type) override;
+
+    bool IsCStringType(lldb::opaque_compiler_type_t type, uint32_t &length) override;
+
+    size_t GetTypeBitAlign(lldb::opaque_compiler_type_t type) override;
+
+    CompilerType GetBasicTypeFromAST(lldb::BasicType basic_type) override;
+
+    bool IsBeingDefined(lldb::opaque_compiler_type_t type) override;
+
+    bool IsConst(lldb::opaque_compiler_type_t type) override;
+
+    uint32_t
+    IsHomogeneousAggregate(lldb::opaque_compiler_type_t type, CompilerType *base_type_ptr) override;
+
+    bool IsPolymorphicClass(lldb::opaque_compiler_type_t type) override;
+
+    bool IsTypedefType(lldb::opaque_compiler_type_t type) override;
+
+    CompilerType GetTypedefedType(lldb::opaque_compiler_type_t type) override;
+
+    bool
+    IsVectorType(lldb::opaque_compiler_type_t type, CompilerType *element_type, 
+                 uint64_t *size) override;
+
+    CompilerType GetFullyUnqualifiedType(lldb::opaque_compiler_type_t type) override;
+
+    CompilerType GetNonReferenceType(lldb::opaque_compiler_type_t type) override;
+
+    bool
+    IsReferenceType(lldb::opaque_compiler_type_t type, 
+                    CompilerType *pointee_type = nullptr, 
+                    bool *is_rvalue = nullptr) override;
+
+    CompilerType CreateBaseType(const ConstString &name, uint64_t);
+
+  private:
+    int m_pointer_byte_size;
+    int m_int_byte_size;
+    std::unique_ptr<DWARFASTParser> m_dwarf_ast_parser_ap;
+    OCamlTypeMap m_base_type_map;
+
+    OCamlASTContext(const OCamlASTContext &) = delete;
+    const OCamlASTContext &operator=(const OCamlASTContext &) = delete;
+};
+
+class OCamlASTContextForExpr : public OCamlASTContext
+{
+    public:
+        OCamlASTContextForExpr(lldb::TargetSP target) : m_target_wp(target) {}
+
+    private:
+        lldb::TargetWP m_target_wp;
+};
+
+}
+#endif // liblldb_OCamlASTContext_h_

include/lldb/Symbol/TypeSystem.h

         eKindSwift,
         eKindGo,
         eKindJava,
+        eKindOCaml,
         kNumKinds
     };
 

source/API/SystemInitializerFull.cpp

 #include "lldb/Symbol/ClangASTContext.h"
 #include "lldb/Symbol/GoASTContext.h"
 #include "lldb/Symbol/JavaASTContext.h"
+#include "lldb/Symbol/OCamlASTContext.h"
 
 #include "Plugins/ABI/MacOSX-arm/ABIMacOSX_arm.h"
 #include "Plugins/ABI/MacOSX-arm64/ABIMacOSX_arm64.h"

 #include "Plugins/Language/Java/JavaLanguage.h"
 #include "Plugins/Language/ObjC/ObjCLanguage.h"
 #include "Plugins/Language/ObjCPlusPlus/ObjCPlusPlusLanguage.h"
+#include "Plugins/Language/OCaml/OCamlLanguage.h"
 #include "Plugins/LanguageRuntime/CPlusPlus/ItaniumABI/ItaniumABILanguageRuntime.h"
 #include "Plugins/LanguageRuntime/Go/GoLanguageRuntime.h"
 #include "Plugins/LanguageRuntime/Java/JavaLanguageRuntime.h"

     ClangASTContext::Initialize();
     GoASTContext::Initialize();
     JavaASTContext::Initialize();
+    OCamlASTContext::Initialize();
 
     ABIMacOSX_i386::Initialize();
     ABIMacOSX_arm::Initialize();

     JavaLanguage::Initialize();
     ObjCLanguage::Initialize();
     ObjCPlusPlusLanguage::Initialize();
+    OCamlLanguage::Initialize();
 
 #if defined(_MSC_VER)
     ProcessWindowsLive::Initialize();

     ClangASTContext::Terminate();
     GoASTContext::Terminate();
     JavaASTContext::Terminate();
+    OCamlASTContext::Terminate();
 
     ABIMacOSX_i386::Terminate();
     ABIMacOSX_arm::Terminate();

     JavaLanguage::Terminate();
     ObjCLanguage::Terminate();
     ObjCPlusPlusLanguage::Terminate();
+    OCamlLanguage::Terminate();
 
 #if defined(__APPLE__)
     DynamicLoaderDarwinKernel::Terminate();

source/Plugins/Language/CMakeLists.txt

 add_subdirectory(Java)
 add_subdirectory(ObjC)
 add_subdirectory(ObjCPlusPlus)
+add_subdirectory(OCaml)

source/Plugins/Language/OCaml/CMakeLists.txt

+add_lldb_library(lldbPluginOCamlLanguage
+  OCamlLanguage.cpp
+)
+

source/Plugins/Language/OCaml/OCamlLanguage.h

+//===-- OCamlLanguage.h ------------------------------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef liblldb_OCamlLanguage_h_
+#define liblldb_OCamlLanguage_h_
+
+// C Includes
+// C++ Includes
+#include <vector>
+
+// Other libraries and framework includes
+#include "llvm/ADT/StringRef.h"
+
+// Project includes
+#include "lldb/Core/ConstString.h"
+#include "lldb/Target/Language.h"
+#include "lldb/lldb-private.h"
+
+namespace lldb_private
+{
+
+class OCamlLanguage : public Language
+{
+public:
+    lldb::LanguageType
+    GetLanguageType() const override
+    {
+        return lldb::eLanguageTypeOCaml;
+    }
+
+    static void
+    Initialize();
+
+    static void
+    Terminate();
+
+    static lldb_private::Language *
+    CreateInstance(lldb::LanguageType language);
+
+    static lldb_private::ConstString
+    GetPluginNameStatic();
+
+    ConstString
+    GetPluginName() override;
+
+    uint32_t
+    GetPluginVersion() override;
+
+    bool
+    IsNilReference(ValueObject &valobj) override;
+};
+
+} // namespace lldb_private
+
+#endif // liblldb_OCamlLanguage_h_

source/Plugins/Language/OCaml/OCamlLanguage.cpp

+//===-- OCamlLanguage.cpp ----------------------------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// C Includes
+#include <string.h>
+// C++ Includes
+#include <functional>
+#include <mutex>
+
+// Other libraries and framework includes
+#include "llvm/ADT/StringRef.h"
+
+// Project includes
+#include "OCamlLanguage.h"
+#include "lldb/Core/ConstString.h"
+#include "lldb/Core/PluginManager.h"
+#include "lldb/DataFormatters/DataVisualization.h"
+#include "lldb/DataFormatters/FormattersHelpers.h"
+#include "lldb/Symbol/OCamlASTContext.h"
+
+using namespace lldb;
+using namespace lldb_private;
+
+void
+OCamlLanguage::Initialize()
+{
+    PluginManager::RegisterPlugin(GetPluginNameStatic(), "OCaml Language", CreateInstance);
+}
+
+void
+OCamlLanguage::Terminate()
+{
+    PluginManager::UnregisterPlugin(CreateInstance);
+}
+
+lldb_private::ConstString
+OCamlLanguage::GetPluginNameStatic()
+{
+    static ConstString g_name("OCaml");
+    return g_name;
+}
+
+lldb_private::ConstString
+OCamlLanguage::GetPluginName()
+{
+    return GetPluginNameStatic();
+}
+
+uint32_t
+OCamlLanguage::GetPluginVersion()
+{
+    return 1;
+}
+
+Language *
+OCamlLanguage::CreateInstance(lldb::LanguageType language)
+{
+    if (language == eLanguageTypeOCaml)
+        return new OCamlLanguage();
+    return nullptr;
+}
+
+bool
+OCamlLanguage::IsNilReference(ValueObject &valobj)
+{
+    if (!valobj.GetCompilerType().IsReferenceType())
+        return false;
+
+    // If we failed to read the value then it is not a nil reference.
+    return valobj.GetValueAsUnsigned(UINT64_MAX) == 0;
+}
+

source/Plugins/SymbolFile/DWARF/CMakeLists.txt

   DWARFASTParserClang.cpp
   DWARFASTParserGo.cpp
   DWARFASTParserJava.cpp
+  DWARFASTParserOCaml.cpp
   DWARFAttribute.cpp
   DWARFCompileUnit.cpp
   DWARFDataExtractor.cpp

source/Plugins/SymbolFile/DWARF/DWARFASTParserOCaml.h

+//===-- DWARFASTParserOCaml.h -----------------------------------*- C++ -*-===//
+
+#ifndef SymbolFileDWARF_DWARFASTParserOCaml_h_
+#define SymbolFileDWARF_DWARFASTParserOCaml_h_
+
+#include "DWARFASTParser.h"
+#include "DWARFCompileUnit.h"
+#include "DWARFDebugInfo.h"
+#include "DWARFDIE.h"
+#include "DWARFDefines.h"
+#include "SymbolFileDWARF.h"
+
+#include "lldb/Symbol/OCamlASTContext.h"
+
+class DWARFDebugInfoEntry;
+class DWARFDIECollection;
+
+class DWARFASTParserOCaml : public DWARFASTParser
+{
+public:
+    DWARFASTParserOCaml (lldb_private::OCamlASTContext &ast);
+
+    virtual ~DWARFASTParserOCaml ();
+
+    lldb::TypeSP
+    ParseBaseTypeFromDIE(const DWARFDIE &die);
+
+    lldb::TypeSP
+    ParseTypeFromDWARF (const lldb_private::SymbolContext& sc,
+                        const DWARFDIE &die,
+                        lldb_private::Log *log,
+                        bool *type_is_new_ptr) override;
+
+    lldb_private::Function *
+    ParseFunctionFromDWARF (const lldb_private::SymbolContext& sc,
+                            const DWARFDIE &die) override;
+
+    bool
+    CompleteTypeFromDWARF (const DWARFDIE &die,
+                           lldb_private::Type *type,
+                           lldb_private::CompilerType &compiler_type) override { return false; }
+
+    lldb_private::CompilerDecl
+    GetDeclForUIDFromDWARF (const DWARFDIE &die) override { return lldb_private::CompilerDecl(); }
+
+    lldb_private::CompilerDeclContext
+    GetDeclContextForUIDFromDWARF (const DWARFDIE &die) override;
+
+    lldb_private::CompilerDeclContext
+    GetDeclContextContainingUIDFromDWARF (const DWARFDIE &die) override;
+
+    std::vector<DWARFDIE>
+    GetDIEForDeclContext (lldb_private::CompilerDeclContext decl_context) override { return {}; }
+
+protected:
+
+    lldb_private::OCamlASTContext &m_ast;
+};
+
+#endif  // SymbolFileDWARF_DWARFASTParserOCaml_h_

source/Plugins/SymbolFile/DWARF/DWARFASTParserOCaml.cpp

+//===-- DWARFASTParserOCaml.cpp ---------------------------------*- C++ -*-===//
+
+#include "DWARFASTParserOCaml.h"
+
+#include "lldb/Core/Error.h"
+#include "lldb/Core/Log.h"
+#include "lldb/Core/Module.h"
+#include "lldb/Symbol/CompileUnit.h"
+#include "lldb/Symbol/Function.h"
+#include "lldb/Symbol/ObjectFile.h"
+#include "lldb/Symbol/Type.h"
+#include "lldb/Symbol/TypeList.h"
+
+using namespace lldb;
+using namespace lldb_private;
+
+DWARFASTParserOCaml::DWARFASTParserOCaml (OCamlASTContext &ast) :
+    m_ast (ast)
+{}
+
+DWARFASTParserOCaml::~DWARFASTParserOCaml () {}
+
+TypeSP
+DWARFASTParserOCaml::ParseBaseTypeFromDIE(const DWARFDIE &die)
+{
+    SymbolFileDWARF *dwarf = die.GetDWARF();
+    dwarf->m_die_to_type[die.GetDIE()] = DIE_IS_BEING_PARSED;
+
+    ConstString type_name;
+    uint64_t byte_size = 0;
+
+    DWARFAttributes attributes;
+    const size_t num_attributes = die.GetAttributes(attributes);
+    for (uint32_t i = 0; i < num_attributes; ++i)
+    {
+        DWARFFormValue form_value;
+        dw_attr_t attr = attributes.AttributeAtIndex(i);
+        if (attributes.ExtractFormValueAtIndex(i, form_value))
+        {
+            switch (attr)
+            {
+                case DW_AT_name:
+                    type_name.SetCString(form_value.AsCString());
+                    break;
+                case DW_AT_byte_size:
+                    byte_size = form_value.Unsigned();
+                    break;
+                case DW_AT_encoding:
+                    break;
+                default:
+                    assert(false && "Unsupported attribute for DW_TAG_base_type");
+            }
+        }
+    }
+
+    Declaration decl;
+    CompilerType compiler_type = m_ast.CreateBaseType(type_name, byte_size);
+    return std::make_shared<Type>(die.GetID(), dwarf, type_name, byte_size, nullptr, LLDB_INVALID_UID,
+            Type::eEncodingIsUID, decl, compiler_type, Type::eResolveStateFull);
+}
+
+lldb::TypeSP
+DWARFASTParserOCaml::ParseTypeFromDWARF (const SymbolContext& sc,
+                                         const DWARFDIE &die,
+                                         Log *log,
+                                         bool *type_is_new_ptr)
+{
+    if (type_is_new_ptr)
+        *type_is_new_ptr = false;
+
+    if (!die)
+        return nullptr;
+
+    SymbolFileDWARF *dwarf = die.GetDWARF();
+
+    Type *type_ptr = dwarf->m_die_to_type.lookup(die.GetDIE());
+    if (type_ptr == DIE_IS_BEING_PARSED)
+        return nullptr;
+    if (type_ptr != nullptr)
+        return type_ptr->shared_from_this();
+
+    TypeSP type_sp;
+    if (type_is_new_ptr)
+        *type_is_new_ptr = true;
+
+    switch (die.Tag())
+    {
+        case DW_TAG_base_type:
+            {
+                type_sp = ParseBaseTypeFromDIE(die);
+                break;
+            }
+        case DW_TAG_array_type:
+            {
+                break;
+            }
+        case DW_TAG_class_type:
+            {
+                break;
+            }
+        case DW_TAG_reference_type:
+            {
+                break;
+            }
+    }
+
+    if (!type_sp)
+        return nullptr;
+
+    DWARFDIE sc_parent_die = SymbolFileDWARF::GetParentSymbolContextDIE(die);
+    dw_tag_t sc_parent_tag = sc_parent_die.Tag();
+
+    SymbolContextScope *symbol_context_scope = nullptr;
+    if (sc_parent_tag == DW_TAG_compile_unit)
+    {
+        symbol_context_scope = sc.comp_unit;
+    }
+    else if (sc.function != nullptr && sc_parent_die)
+    {
+        symbol_context_scope = sc.function->GetBlock(true).FindBlockByID(sc_parent_die.GetID());
+        if (symbol_context_scope == nullptr)
+            symbol_context_scope = sc.function;
+    }
+
+    if (symbol_context_scope != nullptr)
+        type_sp->SetSymbolContextScope(symbol_context_scope);
+
+    dwarf->GetTypeList()->Insert(type_sp);
+    dwarf->m_die_to_type[die.GetDIE()] = type_sp.get();
+
+    return type_sp;
+}
+
+Function *
+DWARFASTParserOCaml::ParseFunctionFromDWARF (const SymbolContext& sc,
+                                             const DWARFDIE &die)
+{
+    DWARFRangeList func_ranges;
+    const char *name = NULL;
+    const char *mangled = NULL;
+    int decl_file = 0;
+    int decl_line = 0;
+    int decl_column = 0;
+    int call_file = 0;
+    int call_line = 0;
+    int call_column = 0;
+    DWARFExpression frame_base(die.GetCU());
+
+    Log *log(lldb_private::GetLogIfAnyCategoriesSet (LIBLLDB_LOG_LANGUAGE));
+
+    if (die)
+    {
+        SymbolFileDWARF *dwarf = die.GetDWARF();
+        if (log)
+        {
+            dwarf->GetObjectFile()->GetModule()->LogMessage(
+                log, "DWARFASTParserOCaml::ParseFunctionFromDWARF (die = 0x%8.8x) %s name = '%s')", die.GetOffset(),
+                DW_TAG_value_to_name(die.Tag()), die.GetName());
+        }
+    }
+
+    assert(die.Tag() == DW_TAG_subprogram);
+
+    if (die.Tag() != DW_TAG_subprogram)
+        return NULL;
+
+    if (die.GetDIENamesAndRanges(name, mangled, func_ranges, decl_file, decl_line, decl_column, call_file, call_line,
+                                 call_column, &frame_base))
+    {
+        AddressRange func_range;
+        lldb::addr_t lowest_func_addr = func_ranges.GetMinRangeBase(0);
+        lldb::addr_t highest_func_addr = func_ranges.GetMaxRangeEnd(0);
+        if (lowest_func_addr != LLDB_INVALID_ADDRESS && lowest_func_addr <= highest_func_addr)
+        {
+            ModuleSP module_sp(die.GetModule());
+            func_range.GetBaseAddress().ResolveAddressUsingFileSections(lowest_func_addr, module_sp->GetSectionList());
+            if (func_range.GetBaseAddress().IsValid())
+                func_range.SetByteSize(highest_func_addr - lowest_func_addr);
+        }
+
+        if (func_range.GetBaseAddress().IsValid())
+        {
+            Mangled func_name;
+
+            func_name.SetValue(ConstString(name), true);
+
+            FunctionSP func_sp;
+            std::unique_ptr<Declaration> decl_ap;
+            if (decl_file != 0 || decl_line != 0 || decl_column != 0)
+                decl_ap.reset(new Declaration(sc.comp_unit->GetSupportFiles().GetFileSpecAtIndex(decl_file), decl_line,
+                                              decl_column));
+
+            SymbolFileDWARF *dwarf = die.GetDWARF();
+            Type *func_type = dwarf->m_die_to_type.lookup(die.GetDIE());
+
+            assert(func_type == NULL || func_type != DIE_IS_BEING_PARSED);
+
+            if (dwarf->FixupAddress(func_range.GetBaseAddress()))
+            {
+                const user_id_t func_user_id = die.GetID();
+                func_sp.reset(new Function(sc.comp_unit,
+                                           func_user_id, // UserID is the DIE offset
+                                           func_user_id,
+                                           func_name,
+                                           func_type,
+                                           func_range)); // first address range
+
+                if (func_sp.get() != NULL)
+                {
+                    if (frame_base.IsValid())
+                        func_sp->GetFrameBaseExpression() = frame_base;
+                    sc.comp_unit->AddFunction(func_sp);
+                    return func_sp.get();
+                }
+            }
+        }
+    }
+
+    return NULL;
+}
+
+lldb_private::CompilerDeclContext
+DWARFASTParserOCaml::GetDeclContextForUIDFromDWARF (const DWARFDIE &die)
+{
+    return CompilerDeclContext();
+}
+
+lldb_private::CompilerDeclContext
+DWARFASTParserOCaml::GetDeclContextContainingUIDFromDWARF (const DWARFDIE &die)
+{
+    return CompilerDeclContext();
+}

source/Plugins/SymbolFile/DWARF/SymbolFileDWARF.h

     friend class DWARFASTParserClang;
     friend class DWARFASTParserGo;
     friend class DWARFASTParserJava;
+    friend class DWARFASTParserOCaml;
 
     //------------------------------------------------------------------
     // Static Functions

source/Symbol/CMakeLists.txt

   LineEntry.cpp
   LineTable.cpp
   ObjectFile.cpp
+  OCamlASTContext.cpp
   Symbol.cpp
   SymbolContext.cpp
   SymbolFile.cpp

source/Symbol/OCamlASTContext.cpp

+//===-- OCamlASTContext.cpp ----------------------------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "lldb/Core/Log.h"
+#include "lldb/Core/Module.h"
+#include "lldb/Core/PluginManager.h"
+#include "lldb/Core/StreamFile.h"
+#include "lldb/Core/ValueObject.h"
+#include "lldb/Symbol/ObjectFile.h"
+#include "lldb/Symbol/SymbolFile.h"
+#include "lldb/Symbol/OCamlASTContext.h"
+#include "lldb/Symbol/Type.h"
+#include "lldb/Target/ExecutionContext.h"
+#include "lldb/Target/Target.h"
+
+#include "Plugins/SymbolFile/DWARF/DWARFASTParserOCaml.h"
+
+using namespace lldb;
+using namespace lldb_private;
+
+namespace lldb_private
+{
+    class OCamlASTContext::OCamlType
+    {
+        public:
+            enum LLVMCastKind
+            {
+                eKindPrimitive,
+                eKindObject,
+                eKindReference,
+                eKindArray,
+                kNumKinds
+            };
+
+            OCamlType(LLVMCastKind kind) : m_kind(kind) {}
+
+            virtual ~OCamlType() = default;
+
+            virtual ConstString
+                GetName() = 0;
+
+            virtual void
+                Dump(Stream *s) = 0;
+
+            virtual bool
+                IsCompleteType() = 0;
+
+            LLVMCastKind
+                getKind() const
+                {
+                    return m_kind;
+                }
+
+        private:
+            LLVMCastKind m_kind;
+    };
+
+} // end of namespace lldb_private
+
+namespace
+{
+
+    class OCamlPrimitiveType : public OCamlASTContext::OCamlType
+    {
+        public:
+            enum TypeKind
+            {
+                eTypeInt,
+            };
+
+            OCamlPrimitiveType(TypeKind type_kind, uint32_t byte_size) : OCamlType(OCamlType::eKindPrimitive), m_type_kind(type_kind), m_type(ConstString()), m_byte_size(byte_size) {}
+
+            OCamlPrimitiveType(TypeKind type_kind, ConstString s, uint32_t byte_size) : OCamlType(OCamlType::eKindPrimitive), m_type_kind(type_kind), m_type(s), m_byte_size(byte_size) {}
+
+            ConstString
+            GetName() override
+            {
+                switch (m_type_kind)
+                {
+                    case eTypeInt:
+                        return m_type;
+                }
+                return ConstString();
+            }
+
+            TypeKind
+            GetTypeKind()
+            {
+                return m_type_kind;
+            }
+
+            void
+            Dump(Stream *s) override
+            {
+                s->Printf("%s\n", GetName().GetCString());
+            }
+
+            bool
+            IsCompleteType() override
+            {
+                return true;
+            }
+
+            static bool
+            classof(const OCamlType *ot)
+            {
+                return ot->getKind() == OCamlType::eKindPrimitive;
+            }
+
+            uint64_t
+            GetByteSize() const
+            {
+                return m_byte_size;
+            }
+
+        private:
+            const TypeKind m_type_kind;
+            const ConstString m_type;
+            uint64_t m_byte_size;
+    };
+}
+
+OCamlASTContext::OCamlASTContext()
+    : TypeSystem(eKindOCaml),
+      m_pointer_byte_size(0),
+      m_int_byte_size(0)
+{
+}
+
+OCamlASTContext::~OCamlASTContext()
+{
+}
+
+ConstString
+OCamlASTContext::GetPluginNameStatic()
+{
+    return ConstString("ocaml");
+}
+
+ConstString
+OCamlASTContext::GetPluginName()
+{
+    return OCamlASTContext::GetPluginNameStatic();
+}
+
+uint32_t
+OCamlASTContext::GetPluginVersion()
+{
+    return 1;
+}
+
+lldb::TypeSystemSP
+OCamlASTContext::CreateInstance (lldb::LanguageType language, Module *module, Target *target)
+{
+    Log *log(lldb_private::GetLogIfAnyCategoriesSet (LIBLLDB_LOG_LANGUAGE));
+
+    if (language == lldb::eLanguageTypeOCaml)
+    {
+        std::shared_ptr<OCamlASTContext> ocaml_ast_sp;
+        ArchSpec arch;
+
+        if (module)
+        {
+            arch = module->GetArchitecture();
+
+            ObjectFile *objfile = module->GetObjectFile();
+            ArchSpec object_arch;
+
+            if (!objfile || !objfile->GetArchitecture(object_arch))
+                return lldb::TypeSystemSP();
+
+            ocaml_ast_sp = std::shared_ptr<OCamlASTContext>(new OCamlASTContext);
+
+            if (log) {
+                log->Printf ("((Module*)%p) [%s]->GetOCamlASTContext() = %p",
+                            (void *)module,
+                            module->GetFileSpec().GetFilename().AsCString("<anonymous>"),
+                            (void *)ocaml_ast_sp.get());
+            }
+
+        } else if (target) {
+            arch = target->GetArchitecture();
+            ocaml_ast_sp = std::shared_ptr<OCamlASTContextForExpr>(new OCamlASTContextForExpr(target->shared_from_this()));
+
+            if (log)
+            {
+                log->Printf ("((Target*)%p)->GetOCamlASTContext() = %p",
+                            (void *)target,
+                            (void *)ocaml_ast_sp.get());
+            }
+        }
+
+        if (arch.IsValid()) {
+            ocaml_ast_sp->SetAddressByteSize(arch.GetAddressByteSize());
+            return ocaml_ast_sp;
+        }
+    }
+
+    return lldb::TypeSystemSP();
+}
+
+void
+OCamlASTContext::EnumerateSupportedLanguages
+(std::set<lldb::LanguageType> &languages_for_types,
+ std::set<lldb::LanguageType> &languages_for_expressions)
+{
+    static std::vector<lldb::LanguageType> s_supported_languages_for_types({lldb::eLanguageTypeOCaml});
+    static std::vector<lldb::LanguageType> s_supported_languages_for_expressions({});
+
+    languages_for_types.insert(s_supported_languages_for_types.begin(), s_supported_languages_for_types.end());
+    languages_for_expressions.insert(s_supported_languages_for_expressions.begin(), s_supported_languages_for_expressions.end());
+}
+
+void
+OCamlASTContext::Initialize()
+{
+    PluginManager::RegisterPlugin (GetPluginNameStatic(),
+                                   "OCaml AST context plug-in",
+                                   CreateInstance,
+                                   EnumerateSupportedLanguages);
+}
+
+void
+OCamlASTContext::Terminate()
+{
+    PluginManager::UnregisterPlugin (CreateInstance);
+}
+
+DWARFASTParser *
+OCamlASTContext::GetDWARFParser()
+{
+    if (!m_dwarf_ast_parser_ap) {
+        m_dwarf_ast_parser_ap.reset(new DWARFASTParserOCaml(*this));
+    }
+
+    return m_dwarf_ast_parser_ap.get();
+}
+
+bool
+OCamlASTContext::IsArrayType(lldb::opaque_compiler_type_t type,
+                             CompilerType *element_type, uint64_t *size,
+                             bool *is_incomplete)
+{
+    return false;
+}
+
+bool
+OCamlASTContext::IsVectorType(lldb::opaque_compiler_type_t type, CompilerType *element_type, uint64_t *size)
+{
+    return false;
+}
+
+bool
+OCamlASTContext::IsAggregateType(lldb::opaque_compiler_type_t type)
+{
+    return false;
+}
+
+bool
+OCamlASTContext::IsBeingDefined(lldb::opaque_compiler_type_t type)
+{
+    return false;
+}
+
+bool
+OCamlASTContext::IsCharType(lldb::opaque_compiler_type_t type)
+{
+    return false;
+}
+
+bool
+OCamlASTContext::IsCompleteType(lldb::opaque_compiler_type_t type)
+{
+    return static_cast<OCamlPrimitiveType *>(type)->IsCompleteType();
+}
+
+bool
+OCamlASTContext::IsConst(lldb::opaque_compiler_type_t type)
+{
+    return false;
+}
+
+bool
+OCamlASTContext::IsCStringType(lldb::opaque_compiler_type_t type, uint32_t &length)
+{
+    return false;
+}
+
+bool
+OCamlASTContext::IsDefined(lldb::opaque_compiler_type_t type)
+{
+    return type != nullptr;
+}
+
+bool
+OCamlASTContext::IsFloatingPointType(lldb::opaque_compiler_type_t type, uint32_t &count, bool &is_complex)
+{
+    return false;
+}
+
+bool
+OCamlASTContext::IsFunctionType(lldb::opaque_compiler_type_t type, bool *is_variadic_ptr)
+{
+    return false;
+}
+
+uint32_t
+OCamlASTContext::IsHomogeneousAggregate(lldb::opaque_compiler_type_t type, CompilerType *base_type_ptr)
+{
+    return false;
+}
+
+size_t
+OCamlASTContext::GetNumberOfFunctionArguments(lldb::opaque_compiler_type_t type)
+{
+    return 0;
+}
+
+CompilerType
+OCamlASTContext::GetFunctionArgumentAtIndex(lldb::opaque_compiler_type_t type, const size_t index)
+{
+    return CompilerType();
+}
+
+bool
+OCamlASTContext::IsFunctionPointerType(lldb::opaque_compiler_type_t type)
+{
+    return IsFunctionType(type);
+}
+
+bool
+OCamlASTContext::IsBlockPointerType (lldb::opaque_compiler_type_t type, CompilerType *function_pointer_type_ptr)
+{
+    return false;
+}
+
+bool
+OCamlASTContext::IsIntegerType(lldb::opaque_compiler_type_t type, bool &is_signed)
+{
+    if (OCamlPrimitiveType *ptype = llvm::dyn_cast<OCamlPrimitiveType>(static_cast<OCamlType *>(type)))
+    {
+        switch (ptype->GetTypeKind())
+        {
+            case OCamlPrimitiveType::eTypeInt:
+                is_signed = true;
+                return true;
+            default:
+                break;
+        }
+    }
+
+    is_signed = false;
+    return false;
+}
+
+bool
+OCamlASTContext::IsPolymorphicClass(lldb::opaque_compiler_type_t type)
+{
+    return false;
+}
+
+bool
+OCamlASTContext::IsPossibleDynamicType(lldb::opaque_compiler_type_t type,
+                                    CompilerType *target_type,
+                                    bool check_cplusplus, bool check_objc)
+{
+    return false;
+}
+
+bool
+OCamlASTContext::IsRuntimeGeneratedType(lldb::opaque_compiler_type_t type)
+{
+    return false;
+}
+
+bool
+OCamlASTContext::IsPointerType(lldb::opaque_compiler_type_t type, CompilerType *pointee_type)
+{
+    if (pointee_type)
+        pointee_type->Clear();
+    return false;
+}
+
+bool
+OCamlASTContext::IsPointerOrReferenceType(lldb::opaque_compiler_type_t type, CompilerType *pointee_type)
+{
+    return IsPointerType(type, pointee_type);
+}
+
+bool
+OCamlASTContext::IsReferenceType(lldb::opaque_compiler_type_t type, CompilerType *pointee_type, bool *is_rvalue)
+{
+    return false;
+}
+
+bool
+OCamlASTContext::IsScalarType(lldb::opaque_compiler_type_t type)
+{
+    return llvm::isa<OCamlPrimitiveType>(static_cast<OCamlType *>(type));
+}
+
+bool
+OCamlASTContext::IsTypedefType(lldb::opaque_compiler_type_t type)
+{
+    return false;
+}
+
+bool
+OCamlASTContext::IsVoidType(lldb::opaque_compiler_type_t type)
+{
+    return false;
+}
+
+bool
+OCamlASTContext::SupportsLanguage (lldb::LanguageType language)
+{
+    return language == lldb::eLanguageTypeOCaml;
+}
+
+bool
+OCamlASTContext::GetCompleteType(lldb::opaque_compiler_type_t type)
+{
+    if (IsCompleteType(type))
+        return true;
+
+    return false;
+}
+
+uint32_t
+OCamlASTContext::GetPointerByteSize()
+{
+    return m_pointer_byte_size;
+}
+
+ConstString
+OCamlASTContext::GetTypeName(lldb::opaque_compiler_type_t type)
+{
+    if (type)
+        return static_cast<OCamlPrimitiveType *>(type)->GetName();
+
+    return ConstString();
+}
+
+uint32_t
+OCamlASTContext::GetTypeInfo(lldb::opaque_compiler_type_t type, CompilerType *pointee_or_element_compiler_type)
+{
+    if (pointee_or_element_compiler_type)
+        pointee_or_element_compiler_type->Clear();
+    if (!type)
+        return 0;
+
+    if (OCamlPrimitiveType *ptype = llvm::dyn_cast<OCamlPrimitiveType>(static_cast<OCamlType *>(type)))
+    {
+        switch (ptype->GetTypeKind())
+        {
+            case OCamlPrimitiveType::eTypeInt:
+                return eTypeHasValue | eTypeIsBuiltIn | eTypeIsScalar | eTypeIsInteger | eTypeIsSigned;
+        }
+    }
+
+    return 0;
+}
+
+lldb::TypeClass
+OCamlASTContext::GetTypeClass(lldb::opaque_compiler_type_t type)
+{
+    if (llvm::isa<OCamlPrimitiveType>(static_cast<OCamlType *>(type)))
+        return eTypeClassBuiltin;
+
+    return lldb::eTypeClassInvalid;
+}
+
+lldb::BasicType
+OCamlASTContext::GetBasicTypeEnumeration(lldb::opaque_compiler_type_t type)
+{
+    return lldb::eBasicTypeInvalid;
+}
+
+lldb::LanguageType
+OCamlASTContext::GetMinimumLanguage(lldb::opaque_compiler_type_t type)
+{
+    return lldb::eLanguageTypeOCaml;
+}
+
+unsigned
+OCamlASTContext::GetTypeQualifiers(lldb::opaque_compiler_type_t type)
+{
+    return 0;
+}
+
+//----------------------------------------------------------------------
+// Creating related types
+//----------------------------------------------------------------------
+
+CompilerType
+OCamlASTContext::GetArrayElementType(lldb::opaque_compiler_type_t type, uint64_t *stride)
+{
+    return CompilerType();
+}
+
+CompilerType
+OCamlASTContext::GetCanonicalType(lldb::opaque_compiler_type_t type)
+{
+    return CompilerType(this, type);
+}
+
+CompilerType
+OCamlASTContext::GetFullyUnqualifiedType(lldb::opaque_compiler_type_t type)
+{
+    return CompilerType(this, type);
+}
+
+int
+OCamlASTContext::GetFunctionArgumentCount(lldb::opaque_compiler_type_t type)
+{
+    return GetNumberOfFunctionArguments(type);
+}
+
+CompilerType
+OCamlASTContext::GetFunctionArgumentTypeAtIndex(lldb::opaque_compiler_type_t type, size_t idx)
+{
+    return GetFunctionArgumentAtIndex(type, idx);
+}
+
+CompilerType
+OCamlASTContext::GetFunctionReturnType(lldb::opaque_compiler_type_t type)
+{
+    return CompilerType();
+}
+
+size_t
+OCamlASTContext::GetNumMemberFunctions(lldb::opaque_compiler_type_t type)
+{
+    return 0;
+}
+
+TypeMemberFunctionImpl
+OCamlASTContext::GetMemberFunctionAtIndex(lldb::opaque_compiler_type_t type, size_t idx)
+{
+    return TypeMemberFunctionImpl();
+}
+
+CompilerType
+OCamlASTContext::GetNonReferenceType(lldb::opaque_compiler_type_t type)
+{
+    return CompilerType(this, type);
+}
+
+CompilerType
+OCamlASTContext::GetPointeeType(lldb::opaque_compiler_type_t type)
+{
+    return CompilerType();
+}
+
+CompilerType
+OCamlASTContext::GetPointerType(lldb::opaque_compiler_type_t type)
+{
+    return CompilerType();
+}
+
+CompilerType
+OCamlASTContext::GetTypedefedType(lldb::opaque_compiler_type_t type)
+{
+    return CompilerType();
+}
+
+CompilerType
+OCamlASTContext::GetBasicTypeFromAST(lldb::BasicType basic_type)
+{
+    return CompilerType();
+}
+
+CompilerType
+OCamlASTContext::GetBuiltinTypeForEncodingAndBitSize (lldb::Encoding encoding,
+                                                      size_t bit_size)
+{
+    return CompilerType();
+}
+
+uint64_t
+OCamlASTContext::GetBitSize(lldb::opaque_compiler_type_t type, ExecutionContextScope *exe_scope)
+{
+    if (OCamlPrimitiveType *ptype = llvm::dyn_cast<OCamlPrimitiveType>(static_cast<OCamlType *>(type)))
+    {
+        switch (ptype->GetTypeKind())
+        {
+            case OCamlPrimitiveType::eTypeInt:
+                return ptype->GetByteSize() * 8;
+        }
+    }
+    return 0;
+}
+
+lldb::Encoding
+OCamlASTContext::GetEncoding(lldb::opaque_compiler_type_t type, uint64_t &count)
+{
+    count = 1;
+    bool is_signed;
+    if (IsIntegerType(type, is_signed))
+        return is_signed ? lldb::eEncodingSint : lldb::eEncodingUint;
+    bool is_complex;
+    uint32_t complex_count;
+    if (IsFloatingPointType(type, complex_count, is_complex))
+    {
+        count = complex_count;
+        return lldb::eEncodingIEEE754;
+    }
+    if (IsPointerType(type))
+        return lldb::eEncodingUint;
+    return lldb::eEncodingInvalid;
+}
+
+lldb::Format
+OCamlASTContext::GetFormat(lldb::opaque_compiler_type_t type)
+{
+    if (!type)
+        return lldb::eFormatDefault;
+    return lldb::eFormatBytes;
+}
+
+size_t
+OCamlASTContext::GetTypeBitAlign(lldb::opaque_compiler_type_t type)
+{
+    return 0;
+}
+
+uint32_t
+OCamlASTContext::GetNumChildren(lldb::opaque_compiler_type_t type, bool omit_empty_base_classes)
+{
+    if (!type || !GetCompleteType(type))
+        return 0;
+
+    return GetNumFields(type);
+}
+
+uint32_t
+OCamlASTContext::GetNumFields(lldb::opaque_compiler_type_t type)
+{
+    if (!type || !GetCompleteType(type))
+        return 0;
+    return 0;
+}
+
+CompilerType
+OCamlASTContext::GetFieldAtIndex(lldb::opaque_compiler_type_t type, size_t idx, 
+                                 std::string &name, uint64_t *bit_offset_ptr,
+                                 uint32_t *bitfield_bit_size_ptr, bool *is_bitfield_ptr)
+{
+    if (bit_offset_ptr)
+        *bit_offset_ptr = 0;
+    if (bitfield_bit_size_ptr)
+        *bitfield_bit_size_ptr = 0;
+    if (is_bitfield_ptr)
+        *is_bitfield_ptr = false;
+
+    if (!type || !GetCompleteType(type))
+        return CompilerType();
+
+    return CompilerType();
+}
+
+CompilerType
+OCamlASTContext::GetChildCompilerTypeAtIndex(lldb::opaque_compiler_type_t type, ExecutionContext *exe_ctx, size_t idx,
+                                             bool transparent_pointers, bool omit_empty_base_classes,
+                                             bool ignore_array_bounds, std::string &child_name,
+                                             uint32_t &child_byte_size, int32_t &child_byte_offset,
+                                             uint32_t &child_bitfield_bit_size, uint32_t &child_bitfield_bit_offset,
+                                             bool &child_is_base_class, bool &child_is_deref_of_parent, ValueObject *valobj,
+                                             uint64_t &language_flags)
+{
+    child_name.clear();
+    child_byte_size = 0;
+    child_byte_offset = 0;
+    child_bitfield_bit_size = 0;
+    child_bitfield_bit_offset = 0;
+    child_is_base_class = false;
+    child_is_deref_of_parent = false;
+    language_flags = 0;
+
+    if (!type || !GetCompleteType(type))
+        return CompilerType();
+
+    return CompilerType();
+}
+
+uint32_t
+OCamlASTContext::GetIndexOfChildWithName(lldb::opaque_compiler_type_t type, const char *name, bool omit_empty_base_classes)
+{
+    if (!type || !GetCompleteType(type))
+        return UINT_MAX;
+
+    return UINT_MAX;
+}
+
+size_t
+OCamlASTContext::GetIndexOfChildMemberWithName(lldb::opaque_compiler_type_t type, const char *name, 
+                                               bool omit_empty_base_classes, std::vector<uint32_t> &child_indexes)
+{
+    uint32_t index = GetIndexOfChildWithName(type, name, omit_empty_base_classes);
+    if (index == UINT_MAX)
+        return 0;
+    child_indexes.push_back(index);
+    return 1;
+}
+
+size_t
+OCamlASTContext::ConvertStringToFloatValue(lldb::opaque_compiler_type_t type, const char *s, uint8_t *dst, size_t dst_size)
+{
+    assert(false);
+    return 0;
+}
+//----------------------------------------------------------------------
+// Dumping types
+//----------------------------------------------------------------------
+
+void
+OCamlASTContext::DumpValue(lldb::opaque_compiler_type_t type, ExecutionContext *exe_ctx, Stream *s, lldb::Format format,
+                           const DataExtractor &data, lldb::offset_t data_byte_offset, size_t data_byte_size,
+                           uint32_t bitfield_bit_size, uint32_t bitfield_bit_offset, bool show_types, bool show_summary,
+                           bool verbose, uint32_t depth)
+{
+    if (!type) {
+        s->Printf("no type\n");
+        return;
+    }
+
+    s->Printf("no value\n");
+
+    if (show_summary)
+        DumpSummary (type, exe_ctx, s, data, data_byte_offset, data_byte_size);
+}
+
+bool
+OCamlASTContext::DumpTypeValue(lldb::opaque_compiler_type_t type, Stream *s, 
+                               lldb::Format format, const DataExtractor &data,
+                               lldb::offset_t byte_offset, size_t byte_size, uint32_t bitfield_bit_size,
+                               uint32_t bitfield_bit_offset, ExecutionContextScope *exe_scope)
+{
+    if (!type) {
+        s->Printf("no type value\n");
+        return false;
+    }
+
+    if (IsScalarType(type))
+    {
+        return 
+        data.Dump(s, byte_offset, format, byte_size, 1, UINT64_MAX,
+                  LLDB_INVALID_ADDRESS, bitfield_bit_size, bitfield_bit_offset, exe_scope);
+    }
+
+    return false;
+}
+
+void
+OCamlASTContext::DumpSummary(lldb::opaque_compiler_type_t type, ExecutionContext *exe_ctx, Stream *s,
+                             const DataExtractor &data, lldb::offset_t data_offset, size_t data_byte_size)
+{
+    s->Printf("no summary\n");
+}
+
+void
+OCamlASTContext::DumpTypeDescription(lldb::opaque_compiler_type_t type)
+{
+    StreamFile s(stdout, false);
+    DumpTypeDescription(type, &s);
+}
+
+void
+OCamlASTContext::DumpTypeDescription(lldb::opaque_compiler_type_t type, Stream *s)
+{
+    static_cast<OCamlType *>(type)->Dump(s);
+}
+
+CompilerType
+OCamlASTContext::CreateBaseType(const ConstString &name, uint64_t byte_size)
+{
+    if (m_base_type_map.empty())
+    {
+        OCamlPrimitiveType *type = new OCamlPrimitiveType(OCamlPrimitiveType::eTypeInt, ConstString("ocaml_int"), byte_size);
+        m_base_type_map.emplace(type->GetName(), std::unique_ptr<OCamlASTContext::OCamlType>(type));
+    }
+
+    auto it = m_base_type_map.find(name);
+    if (it == m_base_type_map.end())
+    {
+        OCamlPrimitiveType *type = new OCamlPrimitiveType(OCamlPrimitiveType::eTypeInt, name, byte_size);
+        it = m_base_type_map.emplace(name, std::unique_ptr<OCamlASTContext::OCamlType>(type)).first;
+    }
+
+    return CompilerType(this, it->second.get());
+}
+