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authorDimitry Andric <dim@FreeBSD.org>2017-01-02 19:26:05 +0000
committerDimitry Andric <dim@FreeBSD.org>2017-01-02 19:26:05 +0000
commit14f1b3e8826ce43b978db93a62d1166055db5394 (patch)
tree0a00ad8d3498783fe0193f3b656bca17c4c8697d /source/Plugins/LanguageRuntime/ObjC/AppleObjCRuntime/AppleObjCTrampolineHandler.cpp
parent4ee8c119c71a06dcad1e0fecc8c675e480e59337 (diff)
downloadsrc-14f1b3e8826ce43b978db93a62d1166055db5394.tar.gz
src-14f1b3e8826ce43b978db93a62d1166055db5394.zip
Vendor import of lldb trunk r290819:vendor/lldb/lldb-trunk-r290819
Notes
Notes: svn path=/vendor/lldb/dist/; revision=311128 svn path=/vendor/lldb/lldb-trunk-r290819/; revision=311129; tag=vendor/lldb/lldb-trunk-r290819
Diffstat (limited to 'source/Plugins/LanguageRuntime/ObjC/AppleObjCRuntime/AppleObjCTrampolineHandler.cpp')
-rw-r--r--source/Plugins/LanguageRuntime/ObjC/AppleObjCRuntime/AppleObjCTrampolineHandler.cpp1648
1 files changed, 823 insertions, 825 deletions
diff --git a/source/Plugins/LanguageRuntime/ObjC/AppleObjCRuntime/AppleObjCTrampolineHandler.cpp b/source/Plugins/LanguageRuntime/ObjC/AppleObjCRuntime/AppleObjCTrampolineHandler.cpp
index 5fedb80e29a6..1dc20c11567e 100644
--- a/source/Plugins/LanguageRuntime/ObjC/AppleObjCRuntime/AppleObjCTrampolineHandler.cpp
+++ b/source/Plugins/LanguageRuntime/ObjC/AppleObjCRuntime/AppleObjCTrampolineHandler.cpp
@@ -1,4 +1,5 @@
-//===-- AppleObjCTrampolineHandler.cpp ----------------------------*- C++ -*-===//
+//===-- AppleObjCTrampolineHandler.cpp ----------------------------*- C++
+//-*-===//
//
// The LLVM Compiler Infrastructure
//
@@ -43,8 +44,11 @@
using namespace lldb;
using namespace lldb_private;
-const char *AppleObjCTrampolineHandler::g_lookup_implementation_function_name = "__lldb_objc_find_implementation_for_selector";
-const char *AppleObjCTrampolineHandler::g_lookup_implementation_with_stret_function_code = " \n\
+const char *AppleObjCTrampolineHandler::g_lookup_implementation_function_name =
+ "__lldb_objc_find_implementation_for_selector";
+const char *AppleObjCTrampolineHandler::
+ g_lookup_implementation_with_stret_function_code =
+ " \n\
extern \"C\" \n\
{ \n\
extern void *class_getMethodImplementation(void *objc_class, void *sel); \n\
@@ -159,7 +163,9 @@ extern \"C\" void * __lldb_objc_find_implementation_for_selector (void *object,
return return_struct.impl_addr; \n\
} \n\
";
-const char *AppleObjCTrampolineHandler::g_lookup_implementation_no_stret_function_code = " \n\
+const char *
+ AppleObjCTrampolineHandler::g_lookup_implementation_no_stret_function_code =
+ " \n\
extern \"C\" \n\
{ \n\
extern void *class_getMethodImplementation(void *objc_class, void *sel); \n\
@@ -266,887 +272,879 @@ extern \"C\" void * __lldb_objc_find_implementation_for_selector (void *object,
} \n\
";
-AppleObjCTrampolineHandler::AppleObjCVTables::VTableRegion::VTableRegion(AppleObjCVTables *owner, lldb::addr_t header_addr) :
- m_valid (true),
- m_owner(owner),
- m_header_addr (header_addr),
- m_code_start_addr(0),
- m_code_end_addr (0),
- m_next_region (0)
-{
- SetUpRegion ();
+AppleObjCTrampolineHandler::AppleObjCVTables::VTableRegion::VTableRegion(
+ AppleObjCVTables *owner, lldb::addr_t header_addr)
+ : m_valid(true), m_owner(owner), m_header_addr(header_addr),
+ m_code_start_addr(0), m_code_end_addr(0), m_next_region(0) {
+ SetUpRegion();
}
-AppleObjCTrampolineHandler::~AppleObjCTrampolineHandler()
-{
-}
+AppleObjCTrampolineHandler::~AppleObjCTrampolineHandler() {}
-void
-AppleObjCTrampolineHandler::AppleObjCVTables::VTableRegion::SetUpRegion()
-{
- // The header looks like:
- //
- // uint16_t headerSize
- // uint16_t descSize
- // uint32_t descCount
- // void * next
- //
- // First read in the header:
-
- char memory_buffer[16];
- ProcessSP process_sp = m_owner->GetProcessSP();
- if (!process_sp)
- return;
- DataExtractor data(memory_buffer, sizeof(memory_buffer),
- process_sp->GetByteOrder(),
- process_sp->GetAddressByteSize());
- size_t actual_size = 8 + process_sp->GetAddressByteSize();
- Error error;
- size_t bytes_read = process_sp->ReadMemory (m_header_addr, memory_buffer, actual_size, error);
- if (bytes_read != actual_size)
- {
- m_valid = false;
- return;
- }
-
- lldb::offset_t offset = 0;
- const uint16_t header_size = data.GetU16(&offset);
- const uint16_t descriptor_size = data.GetU16(&offset);
- const size_t num_descriptors = data.GetU32(&offset);
-
- m_next_region = data.GetPointer(&offset);
-
- // If the header size is 0, that means we've come in too early before this data is set up.
- // Set ourselves as not valid, and continue.
- if (header_size == 0 || num_descriptors == 0)
- {
- m_valid = false;
- return;
- }
-
- // Now read in all the descriptors:
- // The descriptor looks like:
- //
- // uint32_t offset
- // uint32_t flags
- //
- // Where offset is either 0 - in which case it is unused, or
- // it is the offset of the vtable code from the beginning of the descriptor record.
- // Below, we'll convert that into an absolute code address, since I don't want to have
- // to compute it over and over.
-
- // Ingest the whole descriptor array:
- const lldb::addr_t desc_ptr = m_header_addr + header_size;
- const size_t desc_array_size = num_descriptors * descriptor_size;
- DataBufferSP data_sp(new DataBufferHeap (desc_array_size, '\0'));
- uint8_t* dst = (uint8_t*)data_sp->GetBytes();
-
- DataExtractor desc_extractor (dst, desc_array_size,
- process_sp->GetByteOrder(),
- process_sp->GetAddressByteSize());
- bytes_read = process_sp->ReadMemory(desc_ptr, dst, desc_array_size, error);
- if (bytes_read != desc_array_size)
- {
- m_valid = false;
- return;
- }
-
- // The actual code for the vtables will be laid out consecutively, so I also
- // compute the start and end of the whole code block.
-
- offset = 0;
- m_code_start_addr = 0;
- m_code_end_addr = 0;
-
- for (size_t i = 0; i < num_descriptors; i++)
- {
- lldb::addr_t start_offset = offset;
- uint32_t voffset = desc_extractor.GetU32 (&offset);
- uint32_t flags = desc_extractor.GetU32 (&offset);
- lldb::addr_t code_addr = desc_ptr + start_offset + voffset;
- m_descriptors.push_back (VTableDescriptor(flags, code_addr));
-
- if (m_code_start_addr == 0 || code_addr < m_code_start_addr)
- m_code_start_addr = code_addr;
- if (code_addr > m_code_end_addr)
- m_code_end_addr = code_addr;
-
- offset = start_offset + descriptor_size;
- }
- // Finally, a little bird told me that all the vtable code blocks are the same size.
- // Let's compute the blocks and if they are all the same add the size to the code end address:
- lldb::addr_t code_size = 0;
- bool all_the_same = true;
- for (size_t i = 0; i < num_descriptors - 1; i++)
- {
- lldb::addr_t this_size = m_descriptors[i + 1].code_start - m_descriptors[i].code_start;
- if (code_size == 0)
- code_size = this_size;
- else
- {
- if (this_size != code_size)
- all_the_same = false;
- if (this_size > code_size)
- code_size = this_size;
- }
+void AppleObjCTrampolineHandler::AppleObjCVTables::VTableRegion::SetUpRegion() {
+ // The header looks like:
+ //
+ // uint16_t headerSize
+ // uint16_t descSize
+ // uint32_t descCount
+ // void * next
+ //
+ // First read in the header:
+
+ char memory_buffer[16];
+ ProcessSP process_sp = m_owner->GetProcessSP();
+ if (!process_sp)
+ return;
+ DataExtractor data(memory_buffer, sizeof(memory_buffer),
+ process_sp->GetByteOrder(),
+ process_sp->GetAddressByteSize());
+ size_t actual_size = 8 + process_sp->GetAddressByteSize();
+ Error error;
+ size_t bytes_read =
+ process_sp->ReadMemory(m_header_addr, memory_buffer, actual_size, error);
+ if (bytes_read != actual_size) {
+ m_valid = false;
+ return;
+ }
+
+ lldb::offset_t offset = 0;
+ const uint16_t header_size = data.GetU16(&offset);
+ const uint16_t descriptor_size = data.GetU16(&offset);
+ const size_t num_descriptors = data.GetU32(&offset);
+
+ m_next_region = data.GetPointer(&offset);
+
+ // If the header size is 0, that means we've come in too early before this
+ // data is set up.
+ // Set ourselves as not valid, and continue.
+ if (header_size == 0 || num_descriptors == 0) {
+ m_valid = false;
+ return;
+ }
+
+ // Now read in all the descriptors:
+ // The descriptor looks like:
+ //
+ // uint32_t offset
+ // uint32_t flags
+ //
+ // Where offset is either 0 - in which case it is unused, or
+ // it is the offset of the vtable code from the beginning of the descriptor
+ // record.
+ // Below, we'll convert that into an absolute code address, since I don't want
+ // to have
+ // to compute it over and over.
+
+ // Ingest the whole descriptor array:
+ const lldb::addr_t desc_ptr = m_header_addr + header_size;
+ const size_t desc_array_size = num_descriptors * descriptor_size;
+ DataBufferSP data_sp(new DataBufferHeap(desc_array_size, '\0'));
+ uint8_t *dst = (uint8_t *)data_sp->GetBytes();
+
+ DataExtractor desc_extractor(dst, desc_array_size, process_sp->GetByteOrder(),
+ process_sp->GetAddressByteSize());
+ bytes_read = process_sp->ReadMemory(desc_ptr, dst, desc_array_size, error);
+ if (bytes_read != desc_array_size) {
+ m_valid = false;
+ return;
+ }
+
+ // The actual code for the vtables will be laid out consecutively, so I also
+ // compute the start and end of the whole code block.
+
+ offset = 0;
+ m_code_start_addr = 0;
+ m_code_end_addr = 0;
+
+ for (size_t i = 0; i < num_descriptors; i++) {
+ lldb::addr_t start_offset = offset;
+ uint32_t voffset = desc_extractor.GetU32(&offset);
+ uint32_t flags = desc_extractor.GetU32(&offset);
+ lldb::addr_t code_addr = desc_ptr + start_offset + voffset;
+ m_descriptors.push_back(VTableDescriptor(flags, code_addr));
+
+ if (m_code_start_addr == 0 || code_addr < m_code_start_addr)
+ m_code_start_addr = code_addr;
+ if (code_addr > m_code_end_addr)
+ m_code_end_addr = code_addr;
+
+ offset = start_offset + descriptor_size;
+ }
+ // Finally, a little bird told me that all the vtable code blocks are the same
+ // size.
+ // Let's compute the blocks and if they are all the same add the size to the
+ // code end address:
+ lldb::addr_t code_size = 0;
+ bool all_the_same = true;
+ for (size_t i = 0; i < num_descriptors - 1; i++) {
+ lldb::addr_t this_size =
+ m_descriptors[i + 1].code_start - m_descriptors[i].code_start;
+ if (code_size == 0)
+ code_size = this_size;
+ else {
+ if (this_size != code_size)
+ all_the_same = false;
+ if (this_size > code_size)
+ code_size = this_size;
}
- if (all_the_same)
- m_code_end_addr += code_size;
+ }
+ if (all_the_same)
+ m_code_end_addr += code_size;
}
-bool
-AppleObjCTrampolineHandler::AppleObjCVTables::VTableRegion::AddressInRegion (lldb::addr_t addr, uint32_t &flags)
-{
- if (!IsValid())
- return false;
-
- if (addr < m_code_start_addr || addr > m_code_end_addr)
- return false;
-
- std::vector<VTableDescriptor>::iterator pos, end = m_descriptors.end();
- for (pos = m_descriptors.begin(); pos != end; pos++)
- {
- if (addr <= (*pos).code_start)
- {
- flags = (*pos).flags;
- return true;
- }
- }
+bool AppleObjCTrampolineHandler::AppleObjCVTables::VTableRegion::
+ AddressInRegion(lldb::addr_t addr, uint32_t &flags) {
+ if (!IsValid())
+ return false;
+
+ if (addr < m_code_start_addr || addr > m_code_end_addr)
return false;
-}
-void
-AppleObjCTrampolineHandler::AppleObjCVTables::VTableRegion::Dump (Stream &s)
-{
- s.Printf ("Header addr: 0x%" PRIx64 " Code start: 0x%" PRIx64 " Code End: 0x%" PRIx64 " Next: 0x%" PRIx64 "\n",
- m_header_addr, m_code_start_addr, m_code_end_addr, m_next_region);
- size_t num_elements = m_descriptors.size();
- for (size_t i = 0; i < num_elements; i++)
- {
- s.Indent();
- s.Printf ("Code start: 0x%" PRIx64 " Flags: %d\n", m_descriptors[i].code_start, m_descriptors[i].flags);
+ std::vector<VTableDescriptor>::iterator pos, end = m_descriptors.end();
+ for (pos = m_descriptors.begin(); pos != end; pos++) {
+ if (addr <= (*pos).code_start) {
+ flags = (*pos).flags;
+ return true;
}
+ }
+ return false;
}
-
-AppleObjCTrampolineHandler::AppleObjCVTables::AppleObjCVTables (const ProcessSP &process_sp,
- const ModuleSP &objc_module_sp) :
- m_process_wp (),
- m_trampoline_header (LLDB_INVALID_ADDRESS),
- m_trampolines_changed_bp_id (LLDB_INVALID_BREAK_ID),
- m_objc_module_sp (objc_module_sp)
-{
- if (process_sp)
- m_process_wp = process_sp;
+
+void AppleObjCTrampolineHandler::AppleObjCVTables::VTableRegion::Dump(
+ Stream &s) {
+ s.Printf("Header addr: 0x%" PRIx64 " Code start: 0x%" PRIx64
+ " Code End: 0x%" PRIx64 " Next: 0x%" PRIx64 "\n",
+ m_header_addr, m_code_start_addr, m_code_end_addr, m_next_region);
+ size_t num_elements = m_descriptors.size();
+ for (size_t i = 0; i < num_elements; i++) {
+ s.Indent();
+ s.Printf("Code start: 0x%" PRIx64 " Flags: %d\n",
+ m_descriptors[i].code_start, m_descriptors[i].flags);
+ }
}
-AppleObjCTrampolineHandler::AppleObjCVTables::~AppleObjCVTables()
-{
- ProcessSP process_sp = GetProcessSP ();
- if (process_sp)
- {
- if (m_trampolines_changed_bp_id != LLDB_INVALID_BREAK_ID)
- process_sp->GetTarget().RemoveBreakpointByID (m_trampolines_changed_bp_id);
- }
+AppleObjCTrampolineHandler::AppleObjCVTables::AppleObjCVTables(
+ const ProcessSP &process_sp, const ModuleSP &objc_module_sp)
+ : m_process_wp(), m_trampoline_header(LLDB_INVALID_ADDRESS),
+ m_trampolines_changed_bp_id(LLDB_INVALID_BREAK_ID),
+ m_objc_module_sp(objc_module_sp) {
+ if (process_sp)
+ m_process_wp = process_sp;
}
-bool
-AppleObjCTrampolineHandler::AppleObjCVTables::InitializeVTableSymbols ()
-{
- if (m_trampoline_header != LLDB_INVALID_ADDRESS)
- return true;
+AppleObjCTrampolineHandler::AppleObjCVTables::~AppleObjCVTables() {
+ ProcessSP process_sp = GetProcessSP();
+ if (process_sp) {
+ if (m_trampolines_changed_bp_id != LLDB_INVALID_BREAK_ID)
+ process_sp->GetTarget().RemoveBreakpointByID(m_trampolines_changed_bp_id);
+ }
+}
- ProcessSP process_sp = GetProcessSP ();
- if (process_sp)
- {
- Target &target = process_sp->GetTarget();
-
- const ModuleList &target_modules = target.GetImages();
- std::lock_guard<std::recursive_mutex> guard(target_modules.GetMutex());
- size_t num_modules = target_modules.GetSize();
- if (!m_objc_module_sp)
- {
- for (size_t i = 0; i < num_modules; i++)
- {
- if (process_sp->GetObjCLanguageRuntime()->IsModuleObjCLibrary (target_modules.GetModuleAtIndexUnlocked(i)))
- {
- m_objc_module_sp = target_modules.GetModuleAtIndexUnlocked(i);
- break;
- }
- }
- }
-
- if (m_objc_module_sp)
- {
- ConstString trampoline_name ("gdb_objc_trampolines");
- const Symbol *trampoline_symbol = m_objc_module_sp->FindFirstSymbolWithNameAndType (trampoline_name,
- eSymbolTypeData);
- if (trampoline_symbol != NULL)
- {
- m_trampoline_header = trampoline_symbol->GetLoadAddress(&target);
- if (m_trampoline_header == LLDB_INVALID_ADDRESS)
- return false;
-
- // Next look up the "changed" symbol and set a breakpoint on that...
- ConstString changed_name ("gdb_objc_trampolines_changed");
- const Symbol *changed_symbol = m_objc_module_sp->FindFirstSymbolWithNameAndType (changed_name,
- eSymbolTypeCode);
- if (changed_symbol != NULL)
- {
- const Address changed_symbol_addr = changed_symbol->GetAddress();
- if (!changed_symbol_addr.IsValid())
- return false;
-
- lldb::addr_t changed_addr = changed_symbol_addr.GetOpcodeLoadAddress (&target);
- if (changed_addr != LLDB_INVALID_ADDRESS)
- {
- BreakpointSP trampolines_changed_bp_sp = target.CreateBreakpoint (changed_addr, true, false);
- if (trampolines_changed_bp_sp)
- {
- m_trampolines_changed_bp_id = trampolines_changed_bp_sp->GetID();
- trampolines_changed_bp_sp->SetCallback (RefreshTrampolines, this, true);
- trampolines_changed_bp_sp->SetBreakpointKind ("objc-trampolines-changed");
- return true;
- }
- }
- }
- }
+bool AppleObjCTrampolineHandler::AppleObjCVTables::InitializeVTableSymbols() {
+ if (m_trampoline_header != LLDB_INVALID_ADDRESS)
+ return true;
+
+ ProcessSP process_sp = GetProcessSP();
+ if (process_sp) {
+ Target &target = process_sp->GetTarget();
+
+ const ModuleList &target_modules = target.GetImages();
+ std::lock_guard<std::recursive_mutex> guard(target_modules.GetMutex());
+ size_t num_modules = target_modules.GetSize();
+ if (!m_objc_module_sp) {
+ for (size_t i = 0; i < num_modules; i++) {
+ if (process_sp->GetObjCLanguageRuntime()->IsModuleObjCLibrary(
+ target_modules.GetModuleAtIndexUnlocked(i))) {
+ m_objc_module_sp = target_modules.GetModuleAtIndexUnlocked(i);
+ break;
}
+ }
}
- return false;
-}
-
-bool
-AppleObjCTrampolineHandler::AppleObjCVTables::RefreshTrampolines (void *baton,
- StoppointCallbackContext *context,
- lldb::user_id_t break_id,
- lldb::user_id_t break_loc_id)
-{
- AppleObjCVTables *vtable_handler = (AppleObjCVTables *) baton;
- if (vtable_handler->InitializeVTableSymbols())
- {
- // The Update function is called with the address of an added region. So we grab that address, and
- // feed it into ReadRegions. Of course, our friend the ABI will get the values for us.
- ExecutionContext exe_ctx (context->exe_ctx_ref);
- Process *process = exe_ctx.GetProcessPtr();
- const ABI *abi = process->GetABI().get();
-
- ClangASTContext *clang_ast_context = process->GetTarget().GetScratchClangASTContext();
- ValueList argument_values;
- Value input_value;
- CompilerType clang_void_ptr_type = clang_ast_context->GetBasicType(eBasicTypeVoid).GetPointerType();
-
- input_value.SetValueType (Value::eValueTypeScalar);
- //input_value.SetContext (Value::eContextTypeClangType, clang_void_ptr_type);
- input_value.SetCompilerType (clang_void_ptr_type);
- argument_values.PushValue(input_value);
-
- bool success = abi->GetArgumentValues (exe_ctx.GetThreadRef(), argument_values);
- if (!success)
+
+ if (m_objc_module_sp) {
+ ConstString trampoline_name("gdb_objc_trampolines");
+ const Symbol *trampoline_symbol =
+ m_objc_module_sp->FindFirstSymbolWithNameAndType(trampoline_name,
+ eSymbolTypeData);
+ if (trampoline_symbol != NULL) {
+ m_trampoline_header = trampoline_symbol->GetLoadAddress(&target);
+ if (m_trampoline_header == LLDB_INVALID_ADDRESS)
+ return false;
+
+ // Next look up the "changed" symbol and set a breakpoint on that...
+ ConstString changed_name("gdb_objc_trampolines_changed");
+ const Symbol *changed_symbol =
+ m_objc_module_sp->FindFirstSymbolWithNameAndType(changed_name,
+ eSymbolTypeCode);
+ if (changed_symbol != NULL) {
+ const Address changed_symbol_addr = changed_symbol->GetAddress();
+ if (!changed_symbol_addr.IsValid())
return false;
-
- // Now get a pointer value from the zeroth argument.
- Error error;
- DataExtractor data;
- error = argument_values.GetValueAtIndex(0)->GetValueAsData (&exe_ctx,
- data,
- 0,
- NULL);
- lldb::offset_t offset = 0;
- lldb::addr_t region_addr = data.GetPointer(&offset);
-
- if (region_addr != 0)
- vtable_handler->ReadRegions(region_addr);
+
+ lldb::addr_t changed_addr =
+ changed_symbol_addr.GetOpcodeLoadAddress(&target);
+ if (changed_addr != LLDB_INVALID_ADDRESS) {
+ BreakpointSP trampolines_changed_bp_sp =
+ target.CreateBreakpoint(changed_addr, true, false);
+ if (trampolines_changed_bp_sp) {
+ m_trampolines_changed_bp_id = trampolines_changed_bp_sp->GetID();
+ trampolines_changed_bp_sp->SetCallback(RefreshTrampolines, this,
+ true);
+ trampolines_changed_bp_sp->SetBreakpointKind(
+ "objc-trampolines-changed");
+ return true;
+ }
+ }
+ }
+ }
}
- return false;
+ }
+ return false;
}
-bool
-AppleObjCTrampolineHandler::AppleObjCVTables::ReadRegions ()
-{
- // The no argument version reads the start region from the value of the gdb_regions_header, and
- // gets started from there.
-
- m_regions.clear();
- if (!InitializeVTableSymbols())
- return false;
+bool AppleObjCTrampolineHandler::AppleObjCVTables::RefreshTrampolines(
+ void *baton, StoppointCallbackContext *context, lldb::user_id_t break_id,
+ lldb::user_id_t break_loc_id) {
+ AppleObjCVTables *vtable_handler = (AppleObjCVTables *)baton;
+ if (vtable_handler->InitializeVTableSymbols()) {
+ // The Update function is called with the address of an added region. So we
+ // grab that address, and
+ // feed it into ReadRegions. Of course, our friend the ABI will get the
+ // values for us.
+ ExecutionContext exe_ctx(context->exe_ctx_ref);
+ Process *process = exe_ctx.GetProcessPtr();
+ const ABI *abi = process->GetABI().get();
+
+ ClangASTContext *clang_ast_context =
+ process->GetTarget().GetScratchClangASTContext();
+ ValueList argument_values;
+ Value input_value;
+ CompilerType clang_void_ptr_type =
+ clang_ast_context->GetBasicType(eBasicTypeVoid).GetPointerType();
+
+ input_value.SetValueType(Value::eValueTypeScalar);
+ // input_value.SetContext (Value::eContextTypeClangType,
+ // clang_void_ptr_type);
+ input_value.SetCompilerType(clang_void_ptr_type);
+ argument_values.PushValue(input_value);
+
+ bool success =
+ abi->GetArgumentValues(exe_ctx.GetThreadRef(), argument_values);
+ if (!success)
+ return false;
+
+ // Now get a pointer value from the zeroth argument.
Error error;
- ProcessSP process_sp = GetProcessSP ();
- if (process_sp)
- {
- lldb::addr_t region_addr = process_sp->ReadPointerFromMemory (m_trampoline_header, error);
- if (error.Success())
- return ReadRegions (region_addr);
- }
+ DataExtractor data;
+ error = argument_values.GetValueAtIndex(0)->GetValueAsData(&exe_ctx, data,
+ 0, NULL);
+ lldb::offset_t offset = 0;
+ lldb::addr_t region_addr = data.GetPointer(&offset);
+
+ if (region_addr != 0)
+ vtable_handler->ReadRegions(region_addr);
+ }
+ return false;
+}
+
+bool AppleObjCTrampolineHandler::AppleObjCVTables::ReadRegions() {
+ // The no argument version reads the start region from the value of the
+ // gdb_regions_header, and
+ // gets started from there.
+
+ m_regions.clear();
+ if (!InitializeVTableSymbols())
return false;
+ Error error;
+ ProcessSP process_sp = GetProcessSP();
+ if (process_sp) {
+ lldb::addr_t region_addr =
+ process_sp->ReadPointerFromMemory(m_trampoline_header, error);
+ if (error.Success())
+ return ReadRegions(region_addr);
+ }
+ return false;
}
-bool
-AppleObjCTrampolineHandler::AppleObjCVTables::ReadRegions (lldb::addr_t region_addr)
-{
- ProcessSP process_sp = GetProcessSP ();
- if (!process_sp)
- return false;
-
- Log *log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_STEP));
-
- // We aren't starting at the trampoline symbol.
- InitializeVTableSymbols ();
- lldb::addr_t next_region = region_addr;
-
- // Read in the sizes of the headers.
- while (next_region != 0)
- {
- m_regions.push_back (VTableRegion(this, next_region));
- if (!m_regions.back().IsValid())
- {
- m_regions.clear();
- return false;
- }
- if (log)
- {
- StreamString s;
- m_regions.back().Dump(s);
- log->Printf("Read vtable region: \n%s", s.GetData());
- }
-
- next_region = m_regions.back().GetNextRegionAddr();
+bool AppleObjCTrampolineHandler::AppleObjCVTables::ReadRegions(
+ lldb::addr_t region_addr) {
+ ProcessSP process_sp = GetProcessSP();
+ if (!process_sp)
+ return false;
+
+ Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_STEP));
+
+ // We aren't starting at the trampoline symbol.
+ InitializeVTableSymbols();
+ lldb::addr_t next_region = region_addr;
+
+ // Read in the sizes of the headers.
+ while (next_region != 0) {
+ m_regions.push_back(VTableRegion(this, next_region));
+ if (!m_regions.back().IsValid()) {
+ m_regions.clear();
+ return false;
}
-
- return true;
-}
-
-bool
-AppleObjCTrampolineHandler::AppleObjCVTables::IsAddressInVTables (lldb::addr_t addr, uint32_t &flags)
-{
- region_collection::iterator pos, end = m_regions.end();
- for (pos = m_regions.begin(); pos != end; pos++)
- {
- if ((*pos).AddressInRegion (addr, flags))
- return true;
+ if (log) {
+ StreamString s;
+ m_regions.back().Dump(s);
+ log->Printf("Read vtable region: \n%s", s.GetData());
}
- return false;
+
+ next_region = m_regions.back().GetNextRegionAddr();
+ }
+
+ return true;
+}
+
+bool AppleObjCTrampolineHandler::AppleObjCVTables::IsAddressInVTables(
+ lldb::addr_t addr, uint32_t &flags) {
+ region_collection::iterator pos, end = m_regions.end();
+ for (pos = m_regions.begin(); pos != end; pos++) {
+ if ((*pos).AddressInRegion(addr, flags))
+ return true;
+ }
+ return false;
}
const AppleObjCTrampolineHandler::DispatchFunction
-AppleObjCTrampolineHandler::g_dispatch_functions[] =
-{
- // NAME STRET SUPER SUPER2 FIXUP TYPE
- {"objc_msgSend", false, false, false, DispatchFunction::eFixUpNone },
- {"objc_msgSend_fixup", false, false, false, DispatchFunction::eFixUpToFix },
- {"objc_msgSend_fixedup", false, false, false, DispatchFunction::eFixUpFixed },
- {"objc_msgSend_stret", true, false, false, DispatchFunction::eFixUpNone },
- {"objc_msgSend_stret_fixup", true, false, false, DispatchFunction::eFixUpToFix },
- {"objc_msgSend_stret_fixedup", true, false, false, DispatchFunction::eFixUpFixed },
- {"objc_msgSend_fpret", false, false, false, DispatchFunction::eFixUpNone },
- {"objc_msgSend_fpret_fixup", false, false, false, DispatchFunction::eFixUpToFix },
- {"objc_msgSend_fpret_fixedup", false, false, false, DispatchFunction::eFixUpFixed },
- {"objc_msgSend_fp2ret", false, false, true, DispatchFunction::eFixUpNone },
- {"objc_msgSend_fp2ret_fixup", false, false, true, DispatchFunction::eFixUpToFix },
- {"objc_msgSend_fp2ret_fixedup", false, false, true, DispatchFunction::eFixUpFixed },
- {"objc_msgSendSuper", false, true, false, DispatchFunction::eFixUpNone },
- {"objc_msgSendSuper_stret", true, true, false, DispatchFunction::eFixUpNone },
- {"objc_msgSendSuper2", false, true, true, DispatchFunction::eFixUpNone },
- {"objc_msgSendSuper2_fixup", false, true, true, DispatchFunction::eFixUpToFix },
- {"objc_msgSendSuper2_fixedup", false, true, true, DispatchFunction::eFixUpFixed },
- {"objc_msgSendSuper2_stret", true, true, true, DispatchFunction::eFixUpNone },
- {"objc_msgSendSuper2_stret_fixup", true, true, true, DispatchFunction::eFixUpToFix },
- {"objc_msgSendSuper2_stret_fixedup", true, true, true, DispatchFunction::eFixUpFixed },
+ AppleObjCTrampolineHandler::g_dispatch_functions[] = {
+ // NAME STRET SUPER SUPER2 FIXUP TYPE
+ {"objc_msgSend", false, false, false, DispatchFunction::eFixUpNone},
+ {"objc_msgSend_fixup", false, false, false,
+ DispatchFunction::eFixUpToFix},
+ {"objc_msgSend_fixedup", false, false, false,
+ DispatchFunction::eFixUpFixed},
+ {"objc_msgSend_stret", true, false, false,
+ DispatchFunction::eFixUpNone},
+ {"objc_msgSend_stret_fixup", true, false, false,
+ DispatchFunction::eFixUpToFix},
+ {"objc_msgSend_stret_fixedup", true, false, false,
+ DispatchFunction::eFixUpFixed},
+ {"objc_msgSend_fpret", false, false, false,
+ DispatchFunction::eFixUpNone},
+ {"objc_msgSend_fpret_fixup", false, false, false,
+ DispatchFunction::eFixUpToFix},
+ {"objc_msgSend_fpret_fixedup", false, false, false,
+ DispatchFunction::eFixUpFixed},
+ {"objc_msgSend_fp2ret", false, false, true,
+ DispatchFunction::eFixUpNone},
+ {"objc_msgSend_fp2ret_fixup", false, false, true,
+ DispatchFunction::eFixUpToFix},
+ {"objc_msgSend_fp2ret_fixedup", false, false, true,
+ DispatchFunction::eFixUpFixed},
+ {"objc_msgSendSuper", false, true, false, DispatchFunction::eFixUpNone},
+ {"objc_msgSendSuper_stret", true, true, false,
+ DispatchFunction::eFixUpNone},
+ {"objc_msgSendSuper2", false, true, true, DispatchFunction::eFixUpNone},
+ {"objc_msgSendSuper2_fixup", false, true, true,
+ DispatchFunction::eFixUpToFix},
+ {"objc_msgSendSuper2_fixedup", false, true, true,
+ DispatchFunction::eFixUpFixed},
+ {"objc_msgSendSuper2_stret", true, true, true,
+ DispatchFunction::eFixUpNone},
+ {"objc_msgSendSuper2_stret_fixup", true, true, true,
+ DispatchFunction::eFixUpToFix},
+ {"objc_msgSendSuper2_stret_fixedup", true, true, true,
+ DispatchFunction::eFixUpFixed},
};
-AppleObjCTrampolineHandler::AppleObjCTrampolineHandler (const ProcessSP &process_sp,
- const ModuleSP &objc_module_sp) :
- m_process_wp (),
- m_objc_module_sp (objc_module_sp),
- m_lookup_implementation_function_code(nullptr),
- m_impl_fn_addr (LLDB_INVALID_ADDRESS),
- m_impl_stret_fn_addr (LLDB_INVALID_ADDRESS),
- m_msg_forward_addr (LLDB_INVALID_ADDRESS)
-{
- if (process_sp)
- m_process_wp = process_sp;
- // Look up the known resolution functions:
-
- ConstString get_impl_name("class_getMethodImplementation");
- ConstString get_impl_stret_name("class_getMethodImplementation_stret");
- ConstString msg_forward_name("_objc_msgForward");
- ConstString msg_forward_stret_name("_objc_msgForward_stret");
-
- Target *target = process_sp ? &process_sp->GetTarget() : NULL;
- const Symbol *class_getMethodImplementation = m_objc_module_sp->FindFirstSymbolWithNameAndType (get_impl_name, eSymbolTypeCode);
- const Symbol *class_getMethodImplementation_stret = m_objc_module_sp->FindFirstSymbolWithNameAndType (get_impl_stret_name, eSymbolTypeCode);
- const Symbol *msg_forward = m_objc_module_sp->FindFirstSymbolWithNameAndType (msg_forward_name, eSymbolTypeCode);
- const Symbol *msg_forward_stret = m_objc_module_sp->FindFirstSymbolWithNameAndType (msg_forward_stret_name, eSymbolTypeCode);
-
- if (class_getMethodImplementation)
- m_impl_fn_addr = class_getMethodImplementation->GetAddress().GetOpcodeLoadAddress (target);
- if (class_getMethodImplementation_stret)
- m_impl_stret_fn_addr = class_getMethodImplementation_stret->GetAddress().GetOpcodeLoadAddress (target);
- if (msg_forward)
- m_msg_forward_addr = msg_forward->GetAddress().GetOpcodeLoadAddress(target);
- if (msg_forward_stret)
- m_msg_forward_stret_addr = msg_forward_stret->GetAddress().GetOpcodeLoadAddress(target);
-
- // FIXME: Do some kind of logging here.
- if (m_impl_fn_addr == LLDB_INVALID_ADDRESS)
- {
- // If we can't even find the ordinary get method implementation function, then we aren't going to be able to
- // step through any method dispatches. Warn to that effect and get out of here.
- if (process_sp->CanJIT())
- {
- process_sp->GetTarget().GetDebugger().GetErrorFile()->Printf ("Could not find implementation lookup function \"%s\""
- " step in through ObjC method dispatch will not work.\n",
- get_impl_name.AsCString());
- }
- return;
- }
- else if (m_impl_stret_fn_addr == LLDB_INVALID_ADDRESS)
- {
- // It there is no stret return lookup function, assume that it is the same as the straight lookup:
- m_impl_stret_fn_addr = m_impl_fn_addr;
- // Also we will use the version of the lookup code that doesn't rely on the stret version of the function.
- m_lookup_implementation_function_code = g_lookup_implementation_no_stret_function_code;
- }
- else
- {
- m_lookup_implementation_function_code = g_lookup_implementation_with_stret_function_code;
+AppleObjCTrampolineHandler::AppleObjCTrampolineHandler(
+ const ProcessSP &process_sp, const ModuleSP &objc_module_sp)
+ : m_process_wp(), m_objc_module_sp(objc_module_sp),
+ m_lookup_implementation_function_code(nullptr),
+ m_impl_fn_addr(LLDB_INVALID_ADDRESS),
+ m_impl_stret_fn_addr(LLDB_INVALID_ADDRESS),
+ m_msg_forward_addr(LLDB_INVALID_ADDRESS) {
+ if (process_sp)
+ m_process_wp = process_sp;
+ // Look up the known resolution functions:
+
+ ConstString get_impl_name("class_getMethodImplementation");
+ ConstString get_impl_stret_name("class_getMethodImplementation_stret");
+ ConstString msg_forward_name("_objc_msgForward");
+ ConstString msg_forward_stret_name("_objc_msgForward_stret");
+
+ Target *target = process_sp ? &process_sp->GetTarget() : NULL;
+ const Symbol *class_getMethodImplementation =
+ m_objc_module_sp->FindFirstSymbolWithNameAndType(get_impl_name,
+ eSymbolTypeCode);
+ const Symbol *class_getMethodImplementation_stret =
+ m_objc_module_sp->FindFirstSymbolWithNameAndType(get_impl_stret_name,
+ eSymbolTypeCode);
+ const Symbol *msg_forward = m_objc_module_sp->FindFirstSymbolWithNameAndType(
+ msg_forward_name, eSymbolTypeCode);
+ const Symbol *msg_forward_stret =
+ m_objc_module_sp->FindFirstSymbolWithNameAndType(msg_forward_stret_name,
+ eSymbolTypeCode);
+
+ if (class_getMethodImplementation)
+ m_impl_fn_addr =
+ class_getMethodImplementation->GetAddress().GetOpcodeLoadAddress(
+ target);
+ if (class_getMethodImplementation_stret)
+ m_impl_stret_fn_addr =
+ class_getMethodImplementation_stret->GetAddress().GetOpcodeLoadAddress(
+ target);
+ if (msg_forward)
+ m_msg_forward_addr = msg_forward->GetAddress().GetOpcodeLoadAddress(target);
+ if (msg_forward_stret)
+ m_msg_forward_stret_addr =
+ msg_forward_stret->GetAddress().GetOpcodeLoadAddress(target);
+
+ // FIXME: Do some kind of logging here.
+ if (m_impl_fn_addr == LLDB_INVALID_ADDRESS) {
+ // If we can't even find the ordinary get method implementation function,
+ // then we aren't going to be able to
+ // step through any method dispatches. Warn to that effect and get out of
+ // here.
+ if (process_sp->CanJIT()) {
+ process_sp->GetTarget().GetDebugger().GetErrorFile()->Printf(
+ "Could not find implementation lookup function \"%s\""
+ " step in through ObjC method dispatch will not work.\n",
+ get_impl_name.AsCString());
}
-
- // Look up the addresses for the objc dispatch functions and cache them. For now I'm inspecting the symbol
- // names dynamically to figure out how to dispatch to them. If it becomes more complicated than this we can
- // turn the g_dispatch_functions char * array into a template table, and populate the DispatchFunction map
- // from there.
-
- for (size_t i = 0; i != llvm::array_lengthof(g_dispatch_functions); i++)
- {
- ConstString name_const_str(g_dispatch_functions[i].name);
- const Symbol *msgSend_symbol = m_objc_module_sp->FindFirstSymbolWithNameAndType (name_const_str, eSymbolTypeCode);
- if (msgSend_symbol && msgSend_symbol->ValueIsAddress())
- {
- // FixMe: Make g_dispatch_functions static table of DispatchFunctions, and have the map be address->index.
- // Problem is we also need to lookup the dispatch function. For now we could have a side table of stret & non-stret
- // dispatch functions. If that's as complex as it gets, we're fine.
-
- lldb::addr_t sym_addr = msgSend_symbol->GetAddressRef().GetOpcodeLoadAddress(target);
-
- m_msgSend_map.insert(std::pair<lldb::addr_t, int>(sym_addr, i));
- }
+ return;
+ } else if (m_impl_stret_fn_addr == LLDB_INVALID_ADDRESS) {
+ // It there is no stret return lookup function, assume that it is the same
+ // as the straight lookup:
+ m_impl_stret_fn_addr = m_impl_fn_addr;
+ // Also we will use the version of the lookup code that doesn't rely on the
+ // stret version of the function.
+ m_lookup_implementation_function_code =
+ g_lookup_implementation_no_stret_function_code;
+ } else {
+ m_lookup_implementation_function_code =
+ g_lookup_implementation_with_stret_function_code;
+ }
+
+ // Look up the addresses for the objc dispatch functions and cache them. For
+ // now I'm inspecting the symbol
+ // names dynamically to figure out how to dispatch to them. If it becomes
+ // more complicated than this we can
+ // turn the g_dispatch_functions char * array into a template table, and
+ // populate the DispatchFunction map
+ // from there.
+
+ for (size_t i = 0; i != llvm::array_lengthof(g_dispatch_functions); i++) {
+ ConstString name_const_str(g_dispatch_functions[i].name);
+ const Symbol *msgSend_symbol =
+ m_objc_module_sp->FindFirstSymbolWithNameAndType(name_const_str,
+ eSymbolTypeCode);
+ if (msgSend_symbol && msgSend_symbol->ValueIsAddress()) {
+ // FixMe: Make g_dispatch_functions static table of DispatchFunctions, and
+ // have the map be address->index.
+ // Problem is we also need to lookup the dispatch function. For now we
+ // could have a side table of stret & non-stret
+ // dispatch functions. If that's as complex as it gets, we're fine.
+
+ lldb::addr_t sym_addr =
+ msgSend_symbol->GetAddressRef().GetOpcodeLoadAddress(target);
+
+ m_msgSend_map.insert(std::pair<lldb::addr_t, int>(sym_addr, i));
}
-
- // Build our vtable dispatch handler here:
- m_vtables_ap.reset(new AppleObjCVTables(process_sp, m_objc_module_sp));
- if (m_vtables_ap.get())
- m_vtables_ap->ReadRegions();
+ }
+
+ // Build our vtable dispatch handler here:
+ m_vtables_ap.reset(new AppleObjCVTables(process_sp, m_objc_module_sp));
+ if (m_vtables_ap.get())
+ m_vtables_ap->ReadRegions();
}
lldb::addr_t
-AppleObjCTrampolineHandler::SetupDispatchFunction(Thread &thread, ValueList &dispatch_values)
-{
- ThreadSP thread_sp(thread.shared_from_this());
- ExecutionContext exe_ctx (thread_sp);
- DiagnosticManager diagnostics;
- Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_STEP));
+AppleObjCTrampolineHandler::SetupDispatchFunction(Thread &thread,
+ ValueList &dispatch_values) {
+ ThreadSP thread_sp(thread.shared_from_this());
+ ExecutionContext exe_ctx(thread_sp);
+ DiagnosticManager diagnostics;
+ Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_STEP));
- lldb::addr_t args_addr = LLDB_INVALID_ADDRESS;
- FunctionCaller *impl_function_caller = nullptr;
-
- // Scope for mutex locker:
- {
- std::lock_guard<std::mutex> guard(m_impl_function_mutex);
-
- // First stage is to make the ClangUtility to hold our injected function:
-
- if (!m_impl_code.get())
- {
- if (m_lookup_implementation_function_code != NULL)
- {
- Error error;
- m_impl_code.reset (exe_ctx.GetTargetRef().GetUtilityFunctionForLanguage (m_lookup_implementation_function_code,
- eLanguageTypeObjC,
- g_lookup_implementation_function_name,
- error));
- if (error.Fail())
- {
- if (log)
- log->Printf ("Failed to get Utility Function for implementation lookup: %s.", error.AsCString());
- m_impl_code.reset();
- return args_addr;
- }
-
- if (!m_impl_code->Install(diagnostics, exe_ctx))
- {
- if (log)
- {
- log->Printf("Failed to install implementation lookup.");
- diagnostics.Dump(log);
- }
- m_impl_code.reset();
- return args_addr;
- }
- }
- else
- {
- if (log)
- log->Printf("No method lookup implementation code.");
- return LLDB_INVALID_ADDRESS;
- }
+ lldb::addr_t args_addr = LLDB_INVALID_ADDRESS;
+ FunctionCaller *impl_function_caller = nullptr;
- // Next make the runner function for our implementation utility function.
- ClangASTContext *clang_ast_context = thread.GetProcess()->GetTarget().GetScratchClangASTContext();
- CompilerType clang_void_ptr_type = clang_ast_context->GetBasicType(eBasicTypeVoid).GetPointerType();
- Error error;
-
- impl_function_caller = m_impl_code->MakeFunctionCaller(clang_void_ptr_type,
- dispatch_values,
- thread_sp,
- error);
- if (error.Fail())
- {
- if (log)
- log->Printf ("Error getting function caller for dispatch lookup: \"%s\".", error.AsCString());
- return args_addr;
- }
- }
- else
- {
- impl_function_caller = m_impl_code->GetFunctionCaller();
- }
- }
+ // Scope for mutex locker:
+ {
+ std::lock_guard<std::mutex> guard(m_impl_function_mutex);
- diagnostics.Clear();
+ // First stage is to make the ClangUtility to hold our injected function:
- // Now write down the argument values for this particular call. This looks like it might be a race condition
- // if other threads were calling into here, but actually it isn't because we allocate a new args structure for
- // this call by passing args_addr = LLDB_INVALID_ADDRESS...
+ if (!m_impl_code.get()) {
+ if (m_lookup_implementation_function_code != NULL) {
+ Error error;
+ m_impl_code.reset(exe_ctx.GetTargetRef().GetUtilityFunctionForLanguage(
+ m_lookup_implementation_function_code, eLanguageTypeObjC,
+ g_lookup_implementation_function_name, error));
+ if (error.Fail()) {
+ if (log)
+ log->Printf(
+ "Failed to get Utility Function for implementation lookup: %s.",
+ error.AsCString());
+ m_impl_code.reset();
+ return args_addr;
+ }
- if (!impl_function_caller->WriteFunctionArguments(exe_ctx, args_addr, dispatch_values, diagnostics))
- {
- if (log)
- {
- log->Printf("Error writing function arguments.");
+ if (!m_impl_code->Install(diagnostics, exe_ctx)) {
+ if (log) {
+ log->Printf("Failed to install implementation lookup.");
diagnostics.Dump(log);
+ }
+ m_impl_code.reset();
+ return args_addr;
}
+ } else {
+ if (log)
+ log->Printf("No method lookup implementation code.");
+ return LLDB_INVALID_ADDRESS;
+ }
+
+ // Next make the runner function for our implementation utility function.
+ ClangASTContext *clang_ast_context =
+ thread.GetProcess()->GetTarget().GetScratchClangASTContext();
+ CompilerType clang_void_ptr_type =
+ clang_ast_context->GetBasicType(eBasicTypeVoid).GetPointerType();
+ Error error;
+
+ impl_function_caller = m_impl_code->MakeFunctionCaller(
+ clang_void_ptr_type, dispatch_values, thread_sp, error);
+ if (error.Fail()) {
+ if (log)
+ log->Printf(
+ "Error getting function caller for dispatch lookup: \"%s\".",
+ error.AsCString());
return args_addr;
+ }
+ } else {
+ impl_function_caller = m_impl_code->GetFunctionCaller();
}
+ }
+ diagnostics.Clear();
+
+ // Now write down the argument values for this particular call. This looks
+ // like it might be a race condition
+ // if other threads were calling into here, but actually it isn't because we
+ // allocate a new args structure for
+ // this call by passing args_addr = LLDB_INVALID_ADDRESS...
+
+ if (!impl_function_caller->WriteFunctionArguments(
+ exe_ctx, args_addr, dispatch_values, diagnostics)) {
+ if (log) {
+ log->Printf("Error writing function arguments.");
+ diagnostics.Dump(log);
+ }
return args_addr;
+ }
+
+ return args_addr;
}
ThreadPlanSP
-AppleObjCTrampolineHandler::GetStepThroughDispatchPlan (Thread &thread, bool stop_others)
-{
- ThreadPlanSP ret_plan_sp;
- lldb::addr_t curr_pc = thread.GetRegisterContext()->GetPC();
-
- DispatchFunction this_dispatch;
- bool found_it = false;
-
- // First step is to look and see if we are in one of the known ObjC dispatch functions. We've already compiled
- // a table of same, so consult it.
-
- MsgsendMap::iterator pos;
- pos = m_msgSend_map.find (curr_pc);
- if (pos != m_msgSend_map.end())
- {
- this_dispatch = g_dispatch_functions[(*pos).second];
- found_it = true;
+AppleObjCTrampolineHandler::GetStepThroughDispatchPlan(Thread &thread,
+ bool stop_others) {
+ ThreadPlanSP ret_plan_sp;
+ lldb::addr_t curr_pc = thread.GetRegisterContext()->GetPC();
+
+ DispatchFunction this_dispatch;
+ bool found_it = false;
+
+ // First step is to look and see if we are in one of the known ObjC dispatch
+ // functions. We've already compiled
+ // a table of same, so consult it.
+
+ MsgsendMap::iterator pos;
+ pos = m_msgSend_map.find(curr_pc);
+ if (pos != m_msgSend_map.end()) {
+ this_dispatch = g_dispatch_functions[(*pos).second];
+ found_it = true;
+ }
+
+ // Next check to see if we are in a vtable region:
+
+ if (!found_it) {
+ uint32_t flags;
+ if (m_vtables_ap.get()) {
+ found_it = m_vtables_ap->IsAddressInVTables(curr_pc, flags);
+ if (found_it) {
+ this_dispatch.name = "vtable";
+ this_dispatch.stret_return =
+ (flags & AppleObjCVTables::eOBJC_TRAMPOLINE_STRET) ==
+ AppleObjCVTables::eOBJC_TRAMPOLINE_STRET;
+ this_dispatch.is_super = false;
+ this_dispatch.is_super2 = false;
+ this_dispatch.fixedup = DispatchFunction::eFixUpFixed;
+ }
}
-
- // Next check to see if we are in a vtable region:
-
- if (!found_it)
- {
- uint32_t flags;
- if (m_vtables_ap.get())
- {
- found_it = m_vtables_ap->IsAddressInVTables (curr_pc, flags);
- if (found_it)
- {
- this_dispatch.name = "vtable";
- this_dispatch.stret_return
- = (flags & AppleObjCVTables::eOBJC_TRAMPOLINE_STRET) == AppleObjCVTables::eOBJC_TRAMPOLINE_STRET;
- this_dispatch.is_super = false;
- this_dispatch.is_super2 = false;
- this_dispatch.fixedup = DispatchFunction::eFixUpFixed;
- }
- }
+ }
+
+ if (found_it) {
+ Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_STEP));
+
+ // We are decoding a method dispatch.
+ // First job is to pull the arguments out:
+
+ lldb::StackFrameSP thread_cur_frame = thread.GetStackFrameAtIndex(0);
+
+ const ABI *abi = NULL;
+ ProcessSP process_sp(thread.CalculateProcess());
+ if (process_sp)
+ abi = process_sp->GetABI().get();
+ if (abi == NULL)
+ return ret_plan_sp;
+
+ TargetSP target_sp(thread.CalculateTarget());
+
+ ClangASTContext *clang_ast_context = target_sp->GetScratchClangASTContext();
+ ValueList argument_values;
+ Value void_ptr_value;
+ CompilerType clang_void_ptr_type =
+ clang_ast_context->GetBasicType(eBasicTypeVoid).GetPointerType();
+ void_ptr_value.SetValueType(Value::eValueTypeScalar);
+ // void_ptr_value.SetContext (Value::eContextTypeClangType,
+ // clang_void_ptr_type);
+ void_ptr_value.SetCompilerType(clang_void_ptr_type);
+
+ int obj_index;
+ int sel_index;
+
+ // If this is a struct return dispatch, then the first argument is the
+ // return struct pointer, and the object is the second, and the selector is
+ // the third.
+ // Otherwise the object is the first and the selector the second.
+ if (this_dispatch.stret_return) {
+ obj_index = 1;
+ sel_index = 2;
+ argument_values.PushValue(void_ptr_value);
+ argument_values.PushValue(void_ptr_value);
+ argument_values.PushValue(void_ptr_value);
+ } else {
+ obj_index = 0;
+ sel_index = 1;
+ argument_values.PushValue(void_ptr_value);
+ argument_values.PushValue(void_ptr_value);
}
-
- if (found_it)
- {
- Log *log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_STEP));
-
- // We are decoding a method dispatch.
- // First job is to pull the arguments out:
-
- lldb::StackFrameSP thread_cur_frame = thread.GetStackFrameAtIndex(0);
-
- const ABI *abi = NULL;
- ProcessSP process_sp (thread.CalculateProcess());
- if (process_sp)
- abi = process_sp->GetABI().get();
- if (abi == NULL)
- return ret_plan_sp;
-
- TargetSP target_sp (thread.CalculateTarget());
-
- ClangASTContext *clang_ast_context = target_sp->GetScratchClangASTContext();
- ValueList argument_values;
- Value void_ptr_value;
- CompilerType clang_void_ptr_type = clang_ast_context->GetBasicType(eBasicTypeVoid).GetPointerType();
- void_ptr_value.SetValueType (Value::eValueTypeScalar);
- //void_ptr_value.SetContext (Value::eContextTypeClangType, clang_void_ptr_type);
- void_ptr_value.SetCompilerType (clang_void_ptr_type);
-
- int obj_index;
- int sel_index;
-
- // If this is a struct return dispatch, then the first argument is the
- // return struct pointer, and the object is the second, and the selector is the third.
- // Otherwise the object is the first and the selector the second.
- if (this_dispatch.stret_return)
- {
- obj_index = 1;
- sel_index = 2;
- argument_values.PushValue(void_ptr_value);
- argument_values.PushValue(void_ptr_value);
- argument_values.PushValue(void_ptr_value);
- }
- else
- {
- obj_index = 0;
- sel_index = 1;
- argument_values.PushValue(void_ptr_value);
- argument_values.PushValue(void_ptr_value);
- }
-
- bool success = abi->GetArgumentValues (thread, argument_values);
- if (!success)
- return ret_plan_sp;
-
- lldb::addr_t obj_addr = argument_values.GetValueAtIndex(obj_index)->GetScalar().ULongLong();
- if (obj_addr == 0x0)
- {
- if (log)
- log->Printf("Asked to step to dispatch to nil object, returning empty plan.");
- return ret_plan_sp;
- }
-
- ExecutionContext exe_ctx (thread.shared_from_this());
- Process *process = exe_ctx.GetProcessPtr();
- // isa_addr will store the class pointer that the method is being dispatched to - so either the class
- // directly or the super class if this is one of the objc_msgSendSuper flavors. That's mostly used to
- // look up the class/selector pair in our cache.
-
- lldb::addr_t isa_addr = LLDB_INVALID_ADDRESS;
- lldb::addr_t sel_addr = argument_values.GetValueAtIndex(sel_index)->GetScalar().ULongLong();
-
- // Figure out the class this is being dispatched to and see if we've already cached this method call,
- // If so we can push a run-to-address plan directly. Otherwise we have to figure out where
- // the implementation lives.
-
- if (this_dispatch.is_super)
- {
- if (this_dispatch.is_super2)
- {
- // In the objc_msgSendSuper2 case, we don't get the object directly, we get a structure containing
- // the object and the class to which the super message is being sent. So we need to dig the super
- // out of the class and use that.
-
- Value super_value(*(argument_values.GetValueAtIndex(obj_index)));
- super_value.GetScalar() += process->GetAddressByteSize();
- super_value.ResolveValue (&exe_ctx);
-
- if (super_value.GetScalar().IsValid())
- {
-
- // isa_value now holds the class pointer. The second word of the class pointer is the super-class pointer:
- super_value.GetScalar() += process->GetAddressByteSize();
- super_value.ResolveValue (&exe_ctx);
- if (super_value.GetScalar().IsValid())
- isa_addr = super_value.GetScalar().ULongLong();
- else
- {
- if (log)
- log->Printf("Failed to extract the super class value from the class in objc_super.");
- }
- }
- else
- {
- if (log)
- log->Printf("Failed to extract the class value from objc_super.");
- }
- }
- else
- {
- // In the objc_msgSendSuper case, we don't get the object directly, we get a two element structure containing
- // the object and the super class to which the super message is being sent. So the class we want is
- // the second element of this structure.
-
- Value super_value(*(argument_values.GetValueAtIndex(obj_index)));
- super_value.GetScalar() += process->GetAddressByteSize();
- super_value.ResolveValue (&exe_ctx);
-
- if (super_value.GetScalar().IsValid())
- {
- isa_addr = super_value.GetScalar().ULongLong();
- }
- else
- {
- if (log)
- log->Printf("Failed to extract the class value from objc_super.");
- }
- }
- }
- else
- {
- // In the direct dispatch case, the object->isa is the class pointer we want.
-
- // This is a little cheesy, but since object->isa is the first field,
- // making the object value a load address value and resolving it will get
- // the pointer sized data pointed to by that value...
-
- // Note, it isn't a fatal error not to be able to get the address from the object, since this might
- // be a "tagged pointer" which isn't a real object, but rather some word length encoded dingus.
-
- Value isa_value(*(argument_values.GetValueAtIndex(obj_index)));
-
- isa_value.SetValueType(Value::eValueTypeLoadAddress);
- isa_value.ResolveValue(&exe_ctx);
- if (isa_value.GetScalar().IsValid())
- {
- isa_addr = isa_value.GetScalar().ULongLong();
- }
- else
- {
- if (log)
- log->Printf("Failed to extract the isa value from object.");
- }
+ bool success = abi->GetArgumentValues(thread, argument_values);
+ if (!success)
+ return ret_plan_sp;
- }
-
- // Okay, we've got the address of the class for which we're resolving this, let's see if it's in our cache:
- lldb::addr_t impl_addr = LLDB_INVALID_ADDRESS;
-
- if (isa_addr != LLDB_INVALID_ADDRESS)
- {
- if (log)
- {
- log->Printf("Resolving call for class - 0x%" PRIx64 " and selector - 0x%" PRIx64,
- isa_addr, sel_addr);
- }
- ObjCLanguageRuntime *objc_runtime = thread.GetProcess()->GetObjCLanguageRuntime ();
- assert(objc_runtime != NULL);
-
- impl_addr = objc_runtime->LookupInMethodCache (isa_addr, sel_addr);
- }
-
- if (impl_addr != LLDB_INVALID_ADDRESS)
- {
- // Yup, it was in the cache, so we can run to that address directly.
-
+ lldb::addr_t obj_addr =
+ argument_values.GetValueAtIndex(obj_index)->GetScalar().ULongLong();
+ if (obj_addr == 0x0) {
+ if (log)
+ log->Printf(
+ "Asked to step to dispatch to nil object, returning empty plan.");
+ return ret_plan_sp;
+ }
+
+ ExecutionContext exe_ctx(thread.shared_from_this());
+ Process *process = exe_ctx.GetProcessPtr();
+ // isa_addr will store the class pointer that the method is being dispatched
+ // to - so either the class
+ // directly or the super class if this is one of the objc_msgSendSuper
+ // flavors. That's mostly used to
+ // look up the class/selector pair in our cache.
+
+ lldb::addr_t isa_addr = LLDB_INVALID_ADDRESS;
+ lldb::addr_t sel_addr =
+ argument_values.GetValueAtIndex(sel_index)->GetScalar().ULongLong();
+
+ // Figure out the class this is being dispatched to and see if we've already
+ // cached this method call,
+ // If so we can push a run-to-address plan directly. Otherwise we have to
+ // figure out where
+ // the implementation lives.
+
+ if (this_dispatch.is_super) {
+ if (this_dispatch.is_super2) {
+ // In the objc_msgSendSuper2 case, we don't get the object directly, we
+ // get a structure containing
+ // the object and the class to which the super message is being sent.
+ // So we need to dig the super
+ // out of the class and use that.
+
+ Value super_value(*(argument_values.GetValueAtIndex(obj_index)));
+ super_value.GetScalar() += process->GetAddressByteSize();
+ super_value.ResolveValue(&exe_ctx);
+
+ if (super_value.GetScalar().IsValid()) {
+
+ // isa_value now holds the class pointer. The second word of the
+ // class pointer is the super-class pointer:
+ super_value.GetScalar() += process->GetAddressByteSize();
+ super_value.ResolveValue(&exe_ctx);
+ if (super_value.GetScalar().IsValid())
+ isa_addr = super_value.GetScalar().ULongLong();
+ else {
if (log)
- log->Printf ("Found implementation address in cache: 0x%" PRIx64, impl_addr);
-
- ret_plan_sp.reset (new ThreadPlanRunToAddress (thread, impl_addr, stop_others));
+ log->Printf("Failed to extract the super class value from the "
+ "class in objc_super.");
+ }
+ } else {
+ if (log)
+ log->Printf("Failed to extract the class value from objc_super.");
}
- else
- {
- // We haven't seen this class/selector pair yet. Look it up.
- StreamString errors;
- Address impl_code_address;
-
- ValueList dispatch_values;
-
- // We've will inject a little function in the target that takes the object, selector and some flags,
- // and figures out the implementation. Looks like:
- // void *__lldb_objc_find_implementation_for_selector (void *object,
- // void *sel,
- // int is_stret,
- // int is_super,
- // int is_super2,
- // int is_fixup,
- // int is_fixed,
- // int debug)
- // So set up the arguments for that call.
-
- dispatch_values.PushValue (*(argument_values.GetValueAtIndex(obj_index)));
- dispatch_values.PushValue (*(argument_values.GetValueAtIndex(sel_index)));
-
- Value flag_value;
- CompilerType clang_int_type = clang_ast_context->GetBuiltinTypeForEncodingAndBitSize(lldb::eEncodingSint, 32);
- flag_value.SetValueType (Value::eValueTypeScalar);
- //flag_value.SetContext (Value::eContextTypeClangType, clang_int_type);
- flag_value.SetCompilerType (clang_int_type);
-
- if (this_dispatch.stret_return)
- flag_value.GetScalar() = 1;
- else
- flag_value.GetScalar() = 0;
- dispatch_values.PushValue (flag_value);
-
- if (this_dispatch.is_super)
- flag_value.GetScalar() = 1;
- else
- flag_value.GetScalar() = 0;
- dispatch_values.PushValue (flag_value);
-
- if (this_dispatch.is_super2)
- flag_value.GetScalar() = 1;
- else
- flag_value.GetScalar() = 0;
- dispatch_values.PushValue (flag_value);
-
- switch (this_dispatch.fixedup)
- {
- case DispatchFunction::eFixUpNone:
- flag_value.GetScalar() = 0;
- dispatch_values.PushValue (flag_value);
- dispatch_values.PushValue (flag_value);
- break;
- case DispatchFunction::eFixUpFixed:
- flag_value.GetScalar() = 1;
- dispatch_values.PushValue (flag_value);
- flag_value.GetScalar() = 1;
- dispatch_values.PushValue (flag_value);
- break;
- case DispatchFunction::eFixUpToFix:
- flag_value.GetScalar() = 1;
- dispatch_values.PushValue (flag_value);
- flag_value.GetScalar() = 0;
- dispatch_values.PushValue (flag_value);
- break;
- }
- if (log && log->GetVerbose())
- flag_value.GetScalar() = 1;
- else
- flag_value.GetScalar() = 0; // FIXME - Set to 0 when debugging is done.
- dispatch_values.PushValue (flag_value);
-
-
- // The step through code might have to fill in the cache, so it is not safe to run only one thread.
- // So we override the stop_others value passed in to us here:
- const bool trampoline_stop_others = false;
- ret_plan_sp.reset (new AppleThreadPlanStepThroughObjCTrampoline (thread,
- this,
- dispatch_values,
- isa_addr,
- sel_addr,
- trampoline_stop_others));
- if (log)
- {
- StreamString s;
- ret_plan_sp->GetDescription(&s, eDescriptionLevelFull);
- log->Printf("Using ObjC step plan: %s.\n", s.GetData());
- }
+ } else {
+ // In the objc_msgSendSuper case, we don't get the object directly, we
+ // get a two element structure containing
+ // the object and the super class to which the super message is being
+ // sent. So the class we want is
+ // the second element of this structure.
+
+ Value super_value(*(argument_values.GetValueAtIndex(obj_index)));
+ super_value.GetScalar() += process->GetAddressByteSize();
+ super_value.ResolveValue(&exe_ctx);
+
+ if (super_value.GetScalar().IsValid()) {
+ isa_addr = super_value.GetScalar().ULongLong();
+ } else {
+ if (log)
+ log->Printf("Failed to extract the class value from objc_super.");
}
+ }
+ } else {
+ // In the direct dispatch case, the object->isa is the class pointer we
+ // want.
+
+ // This is a little cheesy, but since object->isa is the first field,
+ // making the object value a load address value and resolving it will get
+ // the pointer sized data pointed to by that value...
+
+ // Note, it isn't a fatal error not to be able to get the address from the
+ // object, since this might
+ // be a "tagged pointer" which isn't a real object, but rather some word
+ // length encoded dingus.
+
+ Value isa_value(*(argument_values.GetValueAtIndex(obj_index)));
+
+ isa_value.SetValueType(Value::eValueTypeLoadAddress);
+ isa_value.ResolveValue(&exe_ctx);
+ if (isa_value.GetScalar().IsValid()) {
+ isa_addr = isa_value.GetScalar().ULongLong();
+ } else {
+ if (log)
+ log->Printf("Failed to extract the isa value from object.");
+ }
}
-
- return ret_plan_sp;
+
+ // Okay, we've got the address of the class for which we're resolving this,
+ // let's see if it's in our cache:
+ lldb::addr_t impl_addr = LLDB_INVALID_ADDRESS;
+
+ if (isa_addr != LLDB_INVALID_ADDRESS) {
+ if (log) {
+ log->Printf("Resolving call for class - 0x%" PRIx64
+ " and selector - 0x%" PRIx64,
+ isa_addr, sel_addr);
+ }
+ ObjCLanguageRuntime *objc_runtime =
+ thread.GetProcess()->GetObjCLanguageRuntime();
+ assert(objc_runtime != NULL);
+
+ impl_addr = objc_runtime->LookupInMethodCache(isa_addr, sel_addr);
+ }
+
+ if (impl_addr != LLDB_INVALID_ADDRESS) {
+ // Yup, it was in the cache, so we can run to that address directly.
+
+ if (log)
+ log->Printf("Found implementation address in cache: 0x%" PRIx64,
+ impl_addr);
+
+ ret_plan_sp.reset(
+ new ThreadPlanRunToAddress(thread, impl_addr, stop_others));
+ } else {
+ // We haven't seen this class/selector pair yet. Look it up.
+ StreamString errors;
+ Address impl_code_address;
+
+ ValueList dispatch_values;
+
+ // We've will inject a little function in the target that takes the
+ // object, selector and some flags,
+ // and figures out the implementation. Looks like:
+ // void *__lldb_objc_find_implementation_for_selector (void *object,
+ // void *sel,
+ // int is_stret,
+ // int is_super,
+ // int is_super2,
+ // int is_fixup,
+ // int is_fixed,
+ // int debug)
+ // So set up the arguments for that call.
+
+ dispatch_values.PushValue(*(argument_values.GetValueAtIndex(obj_index)));
+ dispatch_values.PushValue(*(argument_values.GetValueAtIndex(sel_index)));
+
+ Value flag_value;
+ CompilerType clang_int_type =
+ clang_ast_context->GetBuiltinTypeForEncodingAndBitSize(
+ lldb::eEncodingSint, 32);
+ flag_value.SetValueType(Value::eValueTypeScalar);
+ // flag_value.SetContext (Value::eContextTypeClangType, clang_int_type);
+ flag_value.SetCompilerType(clang_int_type);
+
+ if (this_dispatch.stret_return)
+ flag_value.GetScalar() = 1;
+ else
+ flag_value.GetScalar() = 0;
+ dispatch_values.PushValue(flag_value);
+
+ if (this_dispatch.is_super)
+ flag_value.GetScalar() = 1;
+ else
+ flag_value.GetScalar() = 0;
+ dispatch_values.PushValue(flag_value);
+
+ if (this_dispatch.is_super2)
+ flag_value.GetScalar() = 1;
+ else
+ flag_value.GetScalar() = 0;
+ dispatch_values.PushValue(flag_value);
+
+ switch (this_dispatch.fixedup) {
+ case DispatchFunction::eFixUpNone:
+ flag_value.GetScalar() = 0;
+ dispatch_values.PushValue(flag_value);
+ dispatch_values.PushValue(flag_value);
+ break;
+ case DispatchFunction::eFixUpFixed:
+ flag_value.GetScalar() = 1;
+ dispatch_values.PushValue(flag_value);
+ flag_value.GetScalar() = 1;
+ dispatch_values.PushValue(flag_value);
+ break;
+ case DispatchFunction::eFixUpToFix:
+ flag_value.GetScalar() = 1;
+ dispatch_values.PushValue(flag_value);
+ flag_value.GetScalar() = 0;
+ dispatch_values.PushValue(flag_value);
+ break;
+ }
+ if (log && log->GetVerbose())
+ flag_value.GetScalar() = 1;
+ else
+ flag_value.GetScalar() = 0; // FIXME - Set to 0 when debugging is done.
+ dispatch_values.PushValue(flag_value);
+
+ // The step through code might have to fill in the cache, so it is not
+ // safe to run only one thread.
+ // So we override the stop_others value passed in to us here:
+ const bool trampoline_stop_others = false;
+ ret_plan_sp.reset(new AppleThreadPlanStepThroughObjCTrampoline(
+ thread, this, dispatch_values, isa_addr, sel_addr,
+ trampoline_stop_others));
+ if (log) {
+ StreamString s;
+ ret_plan_sp->GetDescription(&s, eDescriptionLevelFull);
+ log->Printf("Using ObjC step plan: %s.\n", s.GetData());
+ }
+ }
+ }
+
+ return ret_plan_sp;
}
FunctionCaller *
-AppleObjCTrampolineHandler::GetLookupImplementationFunctionCaller ()
-{
- return m_impl_code->GetFunctionCaller();
+AppleObjCTrampolineHandler::GetLookupImplementationFunctionCaller() {
+ return m_impl_code->GetFunctionCaller();
}