正如标题所提到的，我对.Framework文件中存储的调试信息的位置感到困惑。
我在谷歌上搜索了几天，得到的是：
通过调试模式编译的框架二进制文件将包括一个调试信息段，以指示符号位置。发布模式编译将把它移到dSYM文件中。
但是，让我困惑的是，我用ninja构建了一个框架，但它没有生成dSYM文件。同时，我无法通过dwarfdump命令或MachOView应用程序找到符号位置。作为Regards，strings命令可以获得一些相对的文件路径结果，如../../flutter/fml/memory/task_runner_checker.cc。
这里的侏儒转储打印：
Flutter.framework/Flutter: file format Mach-O arm64
.debug_info contents:
以下是我的问题：
当我在框架中的某个地方触发断点时，源代码仍然显示。为什么？
当我运行lldb命令时，它显示：
(lldb) image lookup -a $pc --verbose
Address: Flutter[0x0000000001964f18] (Flutter.__TEXT.__text + 26604184)
Summary: Flutter`dart::BootstrapNatives::DN_LoadLibraryFromTypedData(dart::Thread*, dart::Zone*, dart::NativeArguments*) + 44 [inlined] dart::NativeArguments::NativeArgAt(int) const at object.cc:537
Flutter`dart::BootstrapNatives::DN_LoadLibraryFromTypedData(dart::Thread*, dart::Zone*, dart::NativeArguments*) + 44 [inlined] dart::DN_HelperLoadLibraryFromTypedData(dart::Isolate*, dart::Thread*, dart::Zone*, dart::NativeArguments*) at object.cc:534
Flutter`dart::BootstrapNatives::DN_LoadLibraryFromTypedData(dart::Thread*, dart::Zone*, dart::NativeArguments*) + 44 at object.cc:534
Module: file = "/Users/xx/Library/Developer/Xcode/DerivedData/XXX-ddigzjlnuypwnydlawevfrkmdsov/Build/Products/Debug-iphoneos/XXX.app/Frameworks/Flutter.framework/Flutter", arch = "arm64"
CompileUnit: id = {0x00000000}, file = "/Users/xx/Documents/workspace/aion/flutter_engine/src/third_party/dart/runtime/lib/object.cc", language = "c++14"
Function: id = {0x7d40006244d}, name = "dart::BootstrapNatives::DN_LoadLibraryFromTypedData(dart::Thread*, dart::Zone*, dart::NativeArguments*)", mangled = "_ZN4dart16BootstrapNatives27DN_LoadLibraryFromTypedDataEPNS_6ThreadEPNS_4ZoneEPNS_15NativeArgumentsE", range = [0x0000000117310eec-0x0000000117311490)
FuncType: id = {0x7d40006244d}, byte-size = 0, decl = bootstrap_natives.h:507, compiler_type = "class dart::ObjectPtr (class dart::Thread *, class dart::Zone *, class dart::NativeArguments *)"
Blocks: id = {0x7d40006244d}, range = [0x117310eec-0x117311490)
id = {0x7d40006249b}, ranges = [0x117310f18-0x1173113e0)[0x117311404-0x117311490), name = "DN_HelperLoadLibraryFromTypedData", decl = object.cc:534, mangled = _ZN4dartL33DN_HelperLoadLibraryFromTypedDataEPNS_7IsolateEPNS_6ThreadEPNS_4ZoneEPNS_15NativeArgumentsE, demangled = dart::DN_HelperLoadLibraryFromTypedData(dart::Isolate*, dart::Thread*, dart::Zone*, dart::NativeArguments*)
id = {0x7d40006253a}, range = [0x117310f18-0x117310f24), name = "NativeArgAt", decl = native_arguments.h:129, mangled = _ZNK4dart15NativeArguments11NativeArgAtEi, demangled = dart::NativeArguments::NativeArgAt(int) const
LineEntry: [0x0000000117310f18-0x0000000117310f24): /Users/xx/Documents/workspace/xxx/flutter_engine/src/third_party/dart/runtime/vm/native_arguments.h:132:14
Symbol: id = {0x0013fd0f}, range = [0x0000000117310eec-0x0000000117311490), name="dart::BootstrapNatives::DN_LoadLibraryFromTypedData(dart::Thread*, dart::Zone*, dart::NativeArguments*)", mangled="_ZN4dart16BootstrapNatives27DN_LoadLibraryFromTypedDataEPNS_6ThreadEPNS_4ZoneEPNS_15NativeArgumentsE"
Variable: id = {0x7d400062553}, name = "this", type = "const dart::NativeArguments *", location = DW_OP_reg20 W20, decl =
Variable: id = {0x7d40006255c}, name = "index", type = "int", location = <decoding error> 00 00 00, decl = native_arguments.h:129
Variable: id = {0x7d4000624a8}, name = "isolate", type = "dart::Isolate *", location = , decl = object.cc:534
Variable: id = {0x7d4000624ad}, name = "thread", type = "dart::Thread *", location = , decl = object.cc:534
Variable: id = {0x7d4000624b2}, name = "zone", type = "dart::Zone *", location = DW_OP_reg19 W19, decl = object.cc:534
Variable: id = {0x7d4000624bb}, name = "arguments", type = "dart::NativeArguments *", location = DW_OP_reg20 W20, decl = object.cc:534
Variable: id = {0x7d4000624c4}, name = "program", type = "unique_ptr<dart::xx_kernel::Program, std::__1::default_delete<dart::xx_kernel::Program> >", location = DW_OP_breg31 WSP+64, decl = object.cc:556
Variable: id = {0x7d400062468}, name = "thread", type = "dart::Thread *", location = DW_OP_reg24 W24, decl = object.cc:534
Variable: id = {0x7d400062479}, name = "zone", type = "dart::Zone *", location = DW_OP_reg19 W19, decl = object.cc:534
Variable: id = {0x7d40006248a}, name = "arguments", type = "dart::NativeArguments *", location = DW_OP_reg20 W20, decl = object.cc:534
那么，lldb从哪里获得Compile Unit和LineEntry输出呢？
Darwin系统上的调试信息存在于以下两个位置之一：在.o文件中，以及稍后运行dsymutil创建.dSYM后，它存在于.dSYM捆绑包中，所有这些信息都收集在一起，重新定位到实际二进制文件的地址。
这是一个构建链接调试性能增强。链接所有调试信息——更新所有符号地址，四处复制它——非常慢，因此将调试信息留在.o文件中用于这个常见的迭代开发周期，并让调试器定位.o文件并在内部更新函数的地址，可以实现快速开发。
当然，在.o文件中保留所有调试信息需要它们都存在！并且位于相同的文件路径。因此，当您需要在计算机之间移动二进制文件，或者将其保存以供以后调试时，这是不好的。对于这些情况，您可以将调试信息与dsymutil链接，并获得一个.dSYM捆绑包。