import lldb
import binascii
from lldbsuite.test.lldbtest import *
from lldbsuite.test.decorators import *
from lldbsuite.test.gdbclientutils import *
from lldbsuite.test.lldbgdbclient import GDBRemoteTestBase

LLDB_INVALID_ADDRESS = lldb.LLDB_INVALID_ADDRESS
load_address = 0x400000000

def format_register_value(val):
    """
    Encode each byte by two hex digits in little-endian order.
    """
    result = ""
    mask = 0xff
    shift = 0
    for i in range(0, 8):
        x = (val & mask) >> shift
        result += format(x, '02x')
        mask <<= 8
        shift += 8
    return result


class MyResponder(MockGDBServerResponder):
    current_pc = load_address + 0x0a

    def __init__(self, obj_path, module_name = ""):
        self._obj_path = obj_path
        self._module_name = module_name or obj_path
        MockGDBServerResponder.__init__(self)

    def respond(self, packet):
        if packet[0:13] == "qRegisterInfo":
            return self.qRegisterInfo(packet[13:])
        return MockGDBServerResponder.respond(self, packet)

    def qSupported(self, client_supported):
        return "qXfer:libraries:read+;PacketSize=1000;vContSupported-"

    def qHostInfo(self):
        return ""

    def QEnableErrorStrings(self):
        return ""

    def qfThreadInfo(self):
        return "OK"

    def qRegisterInfo(self, index):
        if (index == 0):
            return "name:pc;alt-name:pc;bitsize:64;offset:0;encoding:uint;format:hex;set:General Purpose Registers;gcc:16;dwarf:16;generic:pc;"
        return "E45"

    def qProcessInfo(self):
        return "pid:1;ppid:1;uid:1;gid:1;euid:1;egid:1;name:%s;triple:%s;ptrsize:4" % (hex_encode_bytes("lldb"), hex_encode_bytes("wasm32-unknown-unknown-wasm"))

    def haltReason(self):
        return "T05thread:1;"

    def readRegister(self, register):                
        return format_register_value(self.current_pc)

    def qXferRead(self, obj, annex, offset, length):
        if obj == "libraries":
            xml = '<library-list><library name=\"%s\"><section address=\"%d\"/></library></library-list>' % (self._module_name, load_address)
            return xml, False
        else:
            return None, False

    def readMemory(self, addr, length):
        if addr < load_address: 
            return "E02"
        result = ""
        with open(self._obj_path, mode='rb') as file:
            file_content = bytearray(file.read())                    
            addr_from = addr - load_address
            addr_to = addr_from + min(length, len(file_content) - addr_from)
            for i in range(addr_from, addr_to):
                result += format(file_content[i], '02x')
            file.close()
        return result


class TestWasm(GDBRemoteTestBase):

    @skipIfAsan
    @skipIfXmlSupportMissing
    def test_load_module_with_embedded_symbols_from_remote(self):
        """Test connecting to a WebAssembly engine via GDB-remote and loading a Wasm module with embedded DWARF symbols"""

        yaml_path = "test_wasm_embedded_debug_sections.yaml"
        yaml_base, ext = os.path.splitext(yaml_path)
        obj_path = self.getBuildArtifact(yaml_base)
        self.yaml2obj(yaml_path, obj_path)

        self.server.responder = MyResponder(obj_path, "test_wasm")

        target = self.dbg.CreateTarget("")
        process = self.connect(target)
        lldbutil.expect_state_changes(self, self.dbg.GetListener(), process, [lldb.eStateStopped])
    
        num_modules = target.GetNumModules()
        self.assertEquals(1, num_modules)

        module = target.GetModuleAtIndex(0)
        num_sections = module.GetNumSections()
        self.assertEquals(5, num_sections)

        code_section = module.GetSectionAtIndex(0)
        self.assertEquals("code", code_section.GetName())
        self.assertEquals(load_address | code_section.GetFileOffset(), code_section.GetLoadAddress(target))

        debug_info_section = module.GetSectionAtIndex(1)
        self.assertEquals(".debug_info", debug_info_section.GetName())
        self.assertEquals(load_address | debug_info_section.GetFileOffset(), debug_info_section.GetLoadAddress(target))

        debug_abbrev_section = module.GetSectionAtIndex(2)
        self.assertEquals(".debug_abbrev", debug_abbrev_section.GetName())
        self.assertEquals(load_address | debug_abbrev_section.GetFileOffset(), debug_abbrev_section.GetLoadAddress(target))

        debug_line_section = module.GetSectionAtIndex(3)
        self.assertEquals(".debug_line", debug_line_section.GetName())
        self.assertEquals(load_address | debug_line_section.GetFileOffset(), debug_line_section.GetLoadAddress(target))

        debug_str_section = module.GetSectionAtIndex(4)
        self.assertEquals(".debug_str", debug_str_section.GetName())
        self.assertEquals(load_address | debug_line_section.GetFileOffset(), debug_line_section.GetLoadAddress(target))

        
    @skipIfAsan
    @skipIfXmlSupportMissing
    def test_load_module_with_stripped_symbols_from_remote(self):
        """Test connecting to a WebAssembly engine via GDB-remote and loading a Wasm module with symbols stripped into a separate Wasm file"""

        sym_yaml_path = "test_sym.yaml"
        sym_yaml_base, ext = os.path.splitext(sym_yaml_path)
        sym_obj_path = self.getBuildArtifact(sym_yaml_base) + ".wasm"
        self.yaml2obj(sym_yaml_path, sym_obj_path)

        yaml_path = "test_wasm_external_debug_sections.yaml"
        yaml_base, ext = os.path.splitext(yaml_path)
        obj_path = self.getBuildArtifact(yaml_base) + ".wasm"
        self.yaml2obj(yaml_path, obj_path)

        self.server.responder = MyResponder(obj_path, "test_wasm")

        folder, _ = os.path.split(obj_path)
        self.runCmd("settings set target.debug-file-search-paths " + os.path.abspath(folder))

        target = self.dbg.CreateTarget("")
        process = self.connect(target)
        lldbutil.expect_state_changes(self, self.dbg.GetListener(), process, [lldb.eStateStopped])
    
        num_modules = target.GetNumModules()
        self.assertEquals(1, num_modules)

        module = target.GetModuleAtIndex(0)
        num_sections = module.GetNumSections()
        self.assertEquals(5, num_sections)

        code_section = module.GetSectionAtIndex(0)
        self.assertEquals("code", code_section.GetName())
        self.assertEquals(load_address | code_section.GetFileOffset(), code_section.GetLoadAddress(target))

        debug_info_section = module.GetSectionAtIndex(1)
        self.assertEquals(".debug_info", debug_info_section.GetName())
        self.assertEquals(LLDB_INVALID_ADDRESS, debug_info_section.GetLoadAddress(target))

        debug_abbrev_section = module.GetSectionAtIndex(2)
        self.assertEquals(".debug_abbrev", debug_abbrev_section.GetName())
        self.assertEquals(LLDB_INVALID_ADDRESS, debug_abbrev_section.GetLoadAddress(target))

        debug_line_section = module.GetSectionAtIndex(3)
        self.assertEquals(".debug_line", debug_line_section.GetName())
        self.assertEquals(LLDB_INVALID_ADDRESS, debug_line_section.GetLoadAddress(target))

        debug_str_section = module.GetSectionAtIndex(4)
        self.assertEquals(".debug_str", debug_str_section.GetName())
        self.assertEquals(LLDB_INVALID_ADDRESS, debug_line_section.GetLoadAddress(target))


    @skipIfAsan
    @skipIfXmlSupportMissing
    def test_load_module_from_file(self):
        """Test connecting to a WebAssembly engine via GDB-remote and loading a Wasm module from a file"""

        yaml_path = "test_wasm_embedded_debug_sections.yaml"
        yaml_base, ext = os.path.splitext(yaml_path)
        obj_path = self.getBuildArtifact(yaml_base)
        self.yaml2obj(yaml_path, obj_path)

        self.server.responder = MyResponder(obj_path)

        target = self.dbg.CreateTarget("")
        process = self.connect(target)
        lldbutil.expect_state_changes(self, self.dbg.GetListener(), process, [lldb.eStateStopped])
    
        num_modules = target.GetNumModules()
        self.assertEquals(1, num_modules)

        module = target.GetModuleAtIndex(0)
        num_sections = module.GetNumSections()
        self.assertEquals(5, num_sections)

        code_section = module.GetSectionAtIndex(0)
        self.assertEquals("code", code_section.GetName())
        self.assertEquals(load_address | code_section.GetFileOffset(), code_section.GetLoadAddress(target))

        debug_info_section = module.GetSectionAtIndex(1)
        self.assertEquals(".debug_info", debug_info_section.GetName())
        self.assertEquals(LLDB_INVALID_ADDRESS, debug_info_section.GetLoadAddress(target))

        debug_abbrev_section = module.GetSectionAtIndex(2)
        self.assertEquals(".debug_abbrev", debug_abbrev_section.GetName())
        self.assertEquals(LLDB_INVALID_ADDRESS, debug_abbrev_section.GetLoadAddress(target))

        debug_line_section = module.GetSectionAtIndex(3)
        self.assertEquals(".debug_line", debug_line_section.GetName())
        self.assertEquals(LLDB_INVALID_ADDRESS, debug_line_section.GetLoadAddress(target))

        debug_str_section = module.GetSectionAtIndex(4)
        self.assertEquals(".debug_str", debug_str_section.GetName())
        self.assertEquals(LLDB_INVALID_ADDRESS, debug_line_section.GetLoadAddress(target))

