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#include <string.h>
#include <memory>
#include <vector>
#include "RuntimePrivate.h"
#include "WAVM/IR/Types.h"
#include "WAVM/IR/Value.h"
#include "WAVM/Inline/Assert.h"
#include "WAVM/Inline/BasicTypes.h"
#include "WAVM/LLVMJIT/LLVMJIT.h"
#include "WAVM/Logging/Logging.h"
#include "WAVM/Runtime/Runtime.h"
#include "WAVM/RuntimeABI/RuntimeABI.h"
using namespace WAVM;
using namespace WAVM::IR;
using namespace WAVM::Runtime;
void Runtime::invokeFunction(Context* context,
const Function* function,
FunctionType invokeSig,
const UntaggedValue arguments[],
UntaggedValue outResults[])
{
FunctionType functionType{function->encodedType};
// Verify that the invoke signature matches the function being invoked.
if(invokeSig != functionType && !isSubtype(functionType, invokeSig))
{
if(Log::isCategoryEnabled(Log::debug))
{
Log::printf(
Log::debug,
"Invoke signature mismatch:\n Invoke signature: %s\n Invoked function type: %s\n",
asString(invokeSig).c_str(),
asString(getFunctionType(function)).c_str());
}
throwException(ExceptionTypes::invokeSignatureMismatch);
}
// Assert that the function, the context, and any reference arguments are all in the same
// compartment.
if(false)
{
WAVM_ASSERT(isInCompartment(asObject(function), context->compartment));
for(Uptr argumentIndex = 0; argumentIndex < invokeSig.params().size(); ++argumentIndex)
{
const ValueType argType = invokeSig.params()[argumentIndex];
const UntaggedValue& arg = arguments[argumentIndex];
WAVM_ASSERT(!isReferenceType(argType) || !arg.object
|| isInCompartment(arg.object, context->compartment));
}
}
// Get the invoke thunk for this function type. Cache it in the function's FunctionMutableData
// to avoid the global lock implied by LLVMJIT::getInvokeThunk.
InvokeThunkPointer invokeThunk
= function->mutableData->invokeThunk.load(std::memory_order_acquire);
if(WAVM_UNLIKELY(!invokeThunk))
{
invokeThunk = LLVMJIT::getInvokeThunk(functionType);
// Replace the cached thunk pointer, but since LLVMJIT::getInvokeThunk is guaranteed to
// return the same thunk when called with the same FunctionType, we can assume that any
// other writes this might race with were are writing the same value.
function->mutableData->invokeThunk.store(invokeThunk, std::memory_order_release);
}
WAVM_ASSERT(invokeThunk);
// MacOS std::function is a little more pessimistic about heap allocating captures, and without
// wrapping these captured variables into a single reference, does a heap allocation for the
// thunk passed to unwindSignalsAsExceptions below.
struct InvokeContext
{
Context* context;
const Function* function;
const UntaggedValue* arguments;
UntaggedValue* outResults;
InvokeThunkPointer invokeThunk;
};
InvokeContext invokeContext;
invokeContext.context = context;
invokeContext.function = function;
invokeContext.arguments = arguments;
invokeContext.outResults = outResults;
invokeContext.invokeThunk = invokeThunk;
// Use unwindSignalsAsExceptions to ensure that any signal that occurs in WebAssembly code calls
// C++ destructors on the stack between here and where it is caught.
unwindSignalsAsExceptions([&invokeContext] {
ContextRuntimeData* contextRuntimeData = getContextRuntimeData(invokeContext.context);
// Call the invoke thunk.
(*invokeContext.invokeThunk)(invokeContext.function,
contextRuntimeData,
invokeContext.arguments,
invokeContext.outResults);
});
}
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