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Ladybird+LibWeb: Add optional IDL call tracing

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When launched with the new --enable-idl-tracing option, we now log
every call to web platform APIs declared via IDL, along with the
arguments passed.

This can be very helpful when trying to figure out what a site is
doing, especially if it's not doing what you'd expect.
This commit is contained in:
Andreas Kling 2024-04-16 14:39:57 +02:00
commit f4f4f7781d
Notes: sideshowbarker 2024-07-17 17:06:59 +09:00
8 changed files with 110 additions and 1 deletions
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42
Userland/Libraries/LibWeb/WebIDL/Tracing.cpp Normal file
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/*
* Copyright (c) 2024, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/Format.h>
#include <AK/StringBuilder.h>
#include <LibJS/Runtime/VM.h>
#include <LibWeb/WebIDL/Tracing.h>
namespace Web::WebIDL {
bool g_enable_idl_tracing = false;
void log_trace_impl(JS::VM& vm, char const* function)
{
if (!g_enable_idl_tracing)
return;
StringBuilder builder;
for (size_t i = 0; i < vm.argument_count(); ++i) {
if (i != 0)
builder.append(", "sv);
auto argument = vm.argument(i);
if (argument.is_string())
builder.append_code_point('"');
auto string = argument.to_string_without_side_effects();
for (auto code_point : string.code_points()) {
if (code_point < 0x20) {
builder.appendff("\\u{:04x}", code_point);
continue;
}
builder.append_code_point(code_point);
}
if (argument.is_string())
builder.append_code_point('"');
}
dbgln("{}({})", function, builder.string_view());
}
}