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[wasm][debugger] Fixing race condition #64394

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merged 8 commits into from
Feb 7, 2022
Merged

[wasm][debugger] Fixing race condition #64394

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f2a2027
Fixing race condition.
thaystg Jan 27, 2022
7921a85
Completely avoid race condition as @lewing suggested.
thaystg Jan 29, 2022
bc4dde4
keeping old name
thaystg Jan 29, 2022
532ee06
Addressing @radical comments
thaystg Feb 1, 2022
743791c
Addressing @lewing comments.
thaystg Feb 1, 2022
e511ff9
fix unrelated change
thaystg Feb 1, 2022
a183c57
Addressing @lewing comment offline.
thaystg Feb 2, 2022
b1e1f68
Merge branch 'dotnet:main' into thays_fix_race_condition_debugger_eve…
thaystg Feb 7, 2022
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12 changes: 4 additions & 8 deletions src/mono/mono/component/mini-wasm-debugger.c
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Original file line number Diff line number Diff line change
Expand Up @@ -361,9 +361,7 @@ EMSCRIPTEN_KEEPALIVE gboolean
mono_wasm_send_dbg_command_with_parms (int id, MdbgProtCommandSet command_set, int command, guint8* data, unsigned int size, int valtype, char* newvalue)
{
if (!debugger_enabled) {
EM_ASM ({
MONO.mono_wasm_add_dbg_command_received ($0, $1, $2, $3);
}, 0, id, 0, 0);
mono_wasm_add_dbg_command_received (0, id, 0, 0);
return TRUE;
}
MdbgProtBuffer bufWithParms;
Expand All @@ -382,9 +380,7 @@ EMSCRIPTEN_KEEPALIVE gboolean
mono_wasm_send_dbg_command (int id, MdbgProtCommandSet command_set, int command, guint8* data, unsigned int size)
{
if (!debugger_enabled) {
EM_ASM ({
MONO.mono_wasm_add_dbg_command_received ($0, $1, $2, $3);
}, 0, id, 0, 0);
mono_wasm_add_dbg_command_received(0, id, 0, 0);
return TRUE;
}
ss_calculate_framecount (NULL, NULL, TRUE, NULL, NULL);
Expand All @@ -403,7 +399,7 @@ mono_wasm_send_dbg_command (int id, MdbgProtCommandSet command_set, int command,
else
error = mono_process_dbg_packet (id, command_set, command, &no_reply, data, data + size, &buf);

mono_wasm_add_dbg_command_received(error == MDBGPROT_ERR_NONE, id, buf.buf, buf.p-buf.buf);
mono_wasm_add_dbg_command_received (error == MDBGPROT_ERR_NONE, id, buf.buf, buf.p-buf.buf);

buffer_free (&buf);
return TRUE;
Expand All @@ -412,7 +408,7 @@ mono_wasm_send_dbg_command (int id, MdbgProtCommandSet command_set, int command,
static gboolean
receive_debugger_agent_message (void *data, int len)
{
mono_wasm_add_dbg_command_received(1, -1, data, len);
mono_wasm_add_dbg_command_received(1, 0, data, len);
mono_wasm_save_thread_context();
mono_wasm_fire_debugger_agent_message ();
return FALSE;
Expand Down
18 changes: 11 additions & 7 deletions src/mono/wasm/debugger/BrowserDebugProxy/MonoSDBHelper.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -700,8 +700,8 @@ public PointerValue(long address, int typeId, string varName)
internal class MonoSDBHelper
{
private static int debuggerObjectId;
private static int cmdId;
private static int GetId() {return cmdId++;}
private static int cmdId = 1; //cmdId == 0 is used by events which come from runtime
private static int GetNewId() {return cmdId++;}
private static int MINOR_VERSION = 61;
private static int MAJOR_VERSION = 2;

Expand Down Expand Up @@ -862,7 +862,7 @@ public async Task<bool> EnableReceiveRequests(EventKind eventKind, CancellationT
}

internal async Task<MonoBinaryReader> SendDebuggerAgentCommand<T>(T command, MonoBinaryWriter arguments, CancellationToken token) =>
MonoBinaryReader.From (await proxy.SendMonoCommand(sessionId, MonoCommands.SendDebuggerAgentCommand(proxy.RuntimeId, GetId(), (int)GetCommandSetForCommand(command), (int)(object)command, arguments?.ToBase64().data ?? string.Empty), token));
MonoBinaryReader.From (await proxy.SendMonoCommand(sessionId, MonoCommands.SendDebuggerAgentCommand(proxy.RuntimeId, GetNewId(), (int)GetCommandSetForCommand(command), (int)(object)command, arguments?.ToBase64().data ?? string.Empty), token));

internal CommandSet GetCommandSetForCommand<T>(T command) =>
command switch {
Expand All @@ -885,7 +885,7 @@ internal CommandSet GetCommandSetForCommand<T>(T command) =>
};

internal async Task<MonoBinaryReader> SendDebuggerAgentCommandWithParms<T>(T command, (string data, int length) encoded, int type, string extraParm, CancellationToken token) =>
MonoBinaryReader.From(await proxy.SendMonoCommand(sessionId, MonoCommands.SendDebuggerAgentCommandWithParms(proxy.RuntimeId, GetId(), (int)GetCommandSetForCommand(command), (int)(object)command, encoded.data, encoded.length, type, extraParm), token));
MonoBinaryReader.From(await proxy.SendMonoCommand(sessionId, MonoCommands.SendDebuggerAgentCommandWithParms(proxy.RuntimeId, GetNewId(), (int)GetCommandSetForCommand(command), (int)(object)command, encoded.data, encoded.length, type, extraParm), token));

public async Task<int> CreateString(string value, CancellationToken token)
{
Expand Down Expand Up @@ -2180,6 +2180,7 @@ public async Task<JArray> GetValueTypeProxy(int valueTypeId, CancellationToken t
command = CmdVM.InvokeMethod,
buffer = data,
length = length,
id = GetNewId()
}),
name = propertyNameStr
}));
Expand Down Expand Up @@ -2505,7 +2506,8 @@ async Task<JArray> GetFieldsValues(List<FieldTypeClass> fields, bool isOwn, bool
command = CmdObject.RefSetValues,
buffer = data,
valtype,
length = length
length,
id = GetNewId()
}));
}
if (!isRootHidden)
Expand Down Expand Up @@ -2636,7 +2638,8 @@ public async Task<JArray> GetObjectProxy(int objectId, CancellationToken token)
command = CmdVM.InvokeMethod,
buffer = data,
valtype = attr["set"]["valtype"],
length = length
length,
id = GetNewId()
});
}
continue;
Expand All @@ -2655,7 +2658,8 @@ public async Task<JArray> GetObjectProxy(int objectId, CancellationToken token)
commandSet = CommandSet.Vm,
command = CmdVM.InvokeMethod,
buffer = data,
length = length
length = length,
id = GetNewId()
}),
name = propertyNameStr
}));
Expand Down
21 changes: 13 additions & 8 deletions src/mono/wasm/runtime/debug.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -6,7 +6,8 @@ import { toBase64StringImpl } from "./base64";
import cwraps from "./cwraps";
import { VoidPtr, CharPtr } from "./types/emscripten";

let commands_received: CommandResponse;
const commands_received : any = new Map<number, CommandResponse>();
commands_received.remove = function (key: number) : CommandResponse { const value = this.get(key); this.delete(key); return value;};
let _call_function_res_cache: any = {};
let _next_call_function_res_id = 0;
let _debugger_buffer_len = -1;
Expand Down Expand Up @@ -43,7 +44,9 @@ export function mono_wasm_add_dbg_command_received(res_ok: boolean, id: number,
value: base64String
}
};
commands_received = buffer_obj;
if (commands_received.has(id))
console.warn("Addind an id that already exists in commands_received");
commands_received.set(id, buffer_obj);
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Check if there is an existing entry for id.

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And if there is, should I print a warning?

}

function mono_wasm_malloc_and_set_debug_buffer(command_parameters: string) {
Expand All @@ -63,7 +66,7 @@ export function mono_wasm_send_dbg_command_with_parms(id: number, command_set: n
mono_wasm_malloc_and_set_debug_buffer(command_parameters);
cwraps.mono_wasm_send_dbg_command_with_parms(id, command_set, command, _debugger_buffer, length, valtype, newvalue.toString());

const { res_ok, res } = commands_received;
const { res_ok, res } = commands_received.remove(id);
if (!res_ok)
throw new Error("Failed on mono_wasm_invoke_method_debugger_agent_with_parms");
return res;
Expand All @@ -73,15 +76,17 @@ export function mono_wasm_send_dbg_command(id: number, command_set: number, comm
mono_wasm_malloc_and_set_debug_buffer(command_parameters);
cwraps.mono_wasm_send_dbg_command(id, command_set, command, _debugger_buffer, command_parameters.length);

const { res_ok, res } = commands_received;
const { res_ok, res } = commands_received.remove(id);

if (!res_ok)
throw new Error("Failed on mono_wasm_send_dbg_command");
return res;

}

export function mono_wasm_get_dbg_command_info(): CommandResponseResult {
const { res_ok, res } = commands_received;
const { res_ok, res } = commands_received.remove(0);

if (!res_ok)
throw new Error("Failed on mono_wasm_get_dbg_command_info");
return res;
Expand Down Expand Up @@ -134,10 +139,10 @@ function _create_proxy_from_object_id(objectId: string, details: any) {
prop.name,
{
get() {
return mono_wasm_send_dbg_command(-1, prop.get.commandSet, prop.get.command, prop.get.buffer);
return mono_wasm_send_dbg_command(prop.get.id, prop.get.commandSet, prop.get.command, prop.get.buffer);
},
set: function (newValue) {
mono_wasm_send_dbg_command_with_parms(-1, prop.set.commandSet, prop.set.command, prop.set.buffer, prop.set.length, prop.set.valtype, newValue); return commands_received.res_ok;
mono_wasm_send_dbg_command_with_parms(prop.set.id, prop.set.commandSet, prop.set.command, prop.set.buffer, prop.set.length, prop.set.valtype, newValue); return true;
}
}
);
Expand All @@ -149,7 +154,7 @@ function _create_proxy_from_object_id(objectId: string, details: any) {
return prop.value;
},
set: function (newValue) {
mono_wasm_send_dbg_command_with_parms(-1, prop.set.commandSet, prop.set.command, prop.set.buffer, prop.set.length, prop.set.valtype, newValue); return commands_received.res_ok;
mono_wasm_send_dbg_command_with_parms(prop.set.id, prop.set.commandSet, prop.set.command, prop.set.buffer, prop.set.length, prop.set.valtype, newValue); return true;
}
}
);
Expand Down