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LibWasm: Add execution hooks and a debugger mode to the wasm tool

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This is useful for debugging *our* implementation of wasm :P
This commit is contained in:
Ali Mohammad Pur
2021-05-21 21:10:44 +04:30
committed by Ali Mohammad Pur
parent f740667fa1
commit ba5da79617
8 changed files with 299 additions and 4 deletions
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23
Userland/Libraries/LibWasm/AbstractMachine/Interpreter.cpp
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@@ -126,6 +126,8 @@ void Interpreter::call_address(Configuration& configuration, FunctionAddress add
args.prepend(move(*configuration.stack().pop().get<NonnullOwnPtr<Value>>()));
}
Configuration function_configuration { configuration.store() };
function_configuration.pre_interpret_hook = pre_interpret_hook;
function_configuration.post_interpret_hook = post_interpret_hook;
function_configuration.depth() = configuration.depth() + 1;
auto result = function_configuration.call(address, move(args));
if (result.is_trap()) {
@@ -338,8 +340,25 @@ Vector<NonnullOwnPtr<Value>> Interpreter::pop_values(Configuration& configuratio
void Interpreter::interpret(Configuration& configuration, InstructionPointer& ip, const Instruction& instruction)
{
dbgln_if(WASM_TRACE_DEBUG, "Executing instruction {} at ip {}", instruction_name(instruction.opcode()), ip.value());
if constexpr (WASM_TRACE_DEBUG)
configuration.dump_stack();
if (pre_interpret_hook && *pre_interpret_hook) {
auto result = pre_interpret_hook->operator()(configuration, ip, instruction);
if (!result) {
m_do_trap = true;
return;
}
}
ScopeGuard guard { [&] {
if (post_interpret_hook && *post_interpret_hook) {
auto result = post_interpret_hook->operator()(configuration, ip, instruction, *this);
if (!result) {
m_do_trap = true;
return;
}
}
} };
switch (instruction.opcode().value()) {
case Instructions::unreachable.value():
m_do_trap = true;