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/*
* Copyright (C) 2025 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "WasmDebugServerUtilities.h"
#if ENABLE(WEBASSEMBLY)
WTF_ALLOW_UNSAFE_BUFFER_USAGE_BEGIN
#include "CallFrame.h"
#include "JSWebAssemblyInstance.h"
#include "NativeCallee.h"
#include "WasmCallee.h"
#include "WasmVirtualAddress.h"
#include <cstring>
#include <span>
#include <wtf/Vector.h>
#include <wtf/text/StringView.h>
namespace JSC {
namespace Wasm {
// Splits a string using a sequence of delimiters with exact matching.
// Returns empty vector if any delimiter is missing.
//
// Examples:
// splitWithDelimiters("Z0,400000000000018b,1", ",,") -> ["Z0", "400000000000018b", "1"]
// splitWithDelimiters("qWasmLocal:0:5", "::") -> ["qWasmLocal", "0", "5"]
// splitWithDelimiters("invalid", ",,") -> [] (missing delimiters)
Vector<StringView> splitWithDelimiters(StringView packet, StringView delimiters)
{
Vector<StringView> result;
if (packet.isEmpty() || delimiters.isEmpty())
return result;
StringView current = packet;
// Split on each delimiter in sequence - must find ALL delimiters for exact matching
for (size_t i = 0; i < delimiters.length(); ++i) {
char delimiter = delimiters[i];
size_t pos = current.find(delimiter);
if (pos == notFound)
return Vector<StringView>();
result.append(current.substring(0, pos));
current = current.substring(pos + 1);
}
result.append(current);
return result;
}
bool getWasmReturnPC(CallFrame* currentFrame, uint8_t*& returnPC, VirtualAddress& virtualReturnPC)
{
CallFrame* callerFrame = currentFrame->callerFrame();
if (!callerFrame->callee().isNativeCallee())
return false;
RefPtr caller = callerFrame->callee().asNativeCallee();
if (caller->category() != NativeCallee::Category::Wasm)
return false;
RefPtr wasmCaller = uncheckedDowncast<const Wasm::Callee>(caller.get());
if (wasmCaller->compilationMode() != Wasm::CompilationMode::IPIntMode)
return false;
// Read the WebAssembly return PC from IPInt's saved PC location (cfr-8)
// This contains the WebAssembly bytecode address where execution should continue in the caller
uint8_t* pcLocation = reinterpret_cast<uint8_t*>(currentFrame) - 8;
returnPC = WTF::unalignedLoad<uint8_t*>(pcLocation);
JSWebAssemblyInstance* callerInstance = callerFrame->wasmInstance();
RefPtr ipintCaller = uncheckedDowncast<const Wasm::IPIntCallee>(wasmCaller.get());
virtualReturnPC = VirtualAddress::toVirtual(callerInstance, ipintCaller->functionIndex(), returnPC);
return true;
}
} // namespace Wasm
} // namespace JSC
WTF_ALLOW_UNSAFE_BUFFER_USAGE_END
#endif // ENABLE(WEBASSEMBLY)
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