Paolo Severini 03fc414908 Add initial support for Wasm debugging with LLDB: implements a GDB-remote stub ... This is the first piece of the wasm debugging prototype (besides the changes to add/remove breakpoints in WasmModuleObject made with e699f39cae). This changelist adds the infrastructure for a GDB-remote stub that will be used to manage debugging sessions via the gdb-remote protocol. It enables the creation and termination of debugging sessions over TCP connections that are managed in a separate thread. The logic to actually send, receive and decode GDB-remote packets will be part of a future changelist. Build with: v8_enable_wasm_gdb_remote_debugging = true Run with: --wasm-gdb-remote Enables Wasm debugging with LLDB (default: false) --wasm-gdb-remote-port TCP port to be used for debugging (default: 8765) --wasm-pause-waiting-for-debugger Pauses the execution of Wasm code waiting for a debugger (default: false) --trace-wasm-gdb-remote Enables tracing of Gdb-remote packets (default: false) Note that most of this code is "borrowed" from the code of the Chromium NaCL GDB-remote stub (located in Chromium in src\native_client\src\trusted\debug_stub). Implementation details: - class GdbServer acts as a singleton manager for the gdb-remote stub. It is instantiated as soon as the first Wasm module is loaded in the Wasm engine. - class GdbServerThread spawns the worker thread for the TCP connection. - class Transport manages the socket connection, in a portable way. - class Session represents a remote debugging session. - class Target represents a debugging target and it’s the place where the debugging packets will be processed and will implement the logic to debug a Wasm engine. Bug: chromium:1010467 Change-Id: Ib2324e5901f5ae1d855b96b99ef0995d407322b6 Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1923407 Reviewed-by: Clemens Backes <clemensb@chromium.org> Reviewed-by: Benedikt Meurer <bmeurer@chromium.org> Reviewed-by: Michael Achenbach <machenbach@chromium.org> Commit-Queue: Paolo Severini <paolosev@microsoft.com> Cr-Commit-Position: refs/heads/master@{#66379}		2020-02-20 22:27:58 +00:00
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OWNERS	Use relative paths to OWNERS files	2019-08-12 13:52:52 +00:00
proto_library.gni	[tracing] Fix perfetto build caused by invalid sources	2019-06-24 15:03:31 +00:00
snapshot_toolchain.gni	Reland "Add postmortem debugging helper library"	2019-07-31 14:30:19 +00:00
split_static_library.gni	[build] Move split_static_library.gni from Chromium repo	2019-11-04 15:45:54 +00:00
v8.gni	Add initial support for Wasm debugging with LLDB: implements a GDB-remote stub	2020-02-20 22:27:58 +00:00