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LibWasm+LibWeb: Partially resolve memory exports

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This allows the JS side to access the wasm memory, assuming it's
exported by the module.
This can be used to draw stuff on the wasm side and display them from
the js side, for example :^)
This commit is contained in:
Ali Mohammad Pur
2021-05-17 21:42:56 +04:30
committed by Ali Mohammad Pur
parent 4a459d2430
commit cf8b75c2e5
6 changed files with 173 additions and 49 deletions
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32
Userland/Libraries/LibWasm/AbstractMachine/Interpreter.cpp
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@@ -14,10 +14,19 @@
namespace Wasm {
#define TRAP_IF_NOT(x) \
do { \
if (trap_if_not(x)) \
return; \
#define TRAP_IF_NOT(x) \
do { \
if (trap_if_not(x)) { \
dbgln_if(WASM_TRACE_DEBUG, "Trapped because {} failed, at line {}", #x, __LINE__); \
return; \
} \
} while (false)
#define TRAP_IF_NOT_NORETURN(x) \
do { \
if (trap_if_not(x)) { \
dbgln_if(WASM_TRACE_DEBUG, "Trapped because {} failed, at line {}", #x, __LINE__); \
} \
} while (false)
void Interpreter::interpret(Configuration& configuration)
@@ -56,9 +65,8 @@ void Interpreter::branch_to_label(Configuration& configuration, LabelIndex index
configuration.stack().pop();
}
// Push results in reverse
for (size_t i = results.size(); i > 0; --i)
configuration.stack().push(move(static_cast<Vector<NonnullOwnPtr<Value>>&>(results)[i - 1]));
for (auto& result : results)
configuration.stack().push(move(result));
configuration.ip() = label->continuation();
}
@@ -269,13 +277,12 @@ struct ConvertToRaw<double> {
Vector<NonnullOwnPtr<Value>> Interpreter::pop_values(Configuration& configuration, size_t count)
{
Vector<NonnullOwnPtr<Value>> results;
// Pop results in order
for (size_t i = 0; i < count; ++i) {
auto top_of_stack = configuration.stack().pop();
if (auto value = top_of_stack.get_pointer<NonnullOwnPtr<Value>>())
results.append(move(*value));
results.prepend(move(*value));
else
trap_if_not(value);
TRAP_IF_NOT_NORETURN(value);
}
return results;
}
@@ -361,9 +368,8 @@ void Interpreter::interpret(Configuration& configuration, InstructionPointer& ip
break;
}
// Push results in reverse
for (size_t i = 1; i < results.size() + 1; ++i)
configuration.stack().push(move(static_cast<Vector<NonnullOwnPtr<Value>>&>(results)[results.size() - i]));
for (auto& result : results)
configuration.stack().push(move(result));
if (instruction.opcode() == Instructions::structured_end)
return;