AccessCaseSnippetParams.cpp [plain text]
#include "config.h"
#include "AccessCaseSnippetParams.h"
#include "LinkBuffer.h"
#include "PolymorphicAccess.h"
#include "StructureStubInfo.h"
#if ENABLE(JIT)
namespace JSC {
template<typename JumpType, typename FunctionType, typename ResultType, typename... Arguments>
class SlowPathCallGeneratorWithArguments : public AccessCaseSnippetParams::SlowPathCallGenerator {
public:
SlowPathCallGeneratorWithArguments(JumpType from, CCallHelpers::Label to, FunctionType function, ResultType result, std::tuple<Arguments...> arguments)
: m_from(from)
, m_to(to)
, m_function(function)
, m_result(result)
, m_arguments(arguments)
{
}
template<size_t... ArgumentsIndex>
CCallHelpers::JumpList generateImpl(AccessGenerationState& state, const RegisterSet& usedRegistersBySnippet, CCallHelpers& jit, std::index_sequence<ArgumentsIndex...>)
{
CCallHelpers::JumpList exceptions;
AccessGenerationState::SpillState spillState = state.preserveLiveRegistersToStackForCall(usedRegistersBySnippet);
jit.store32(
CCallHelpers::TrustedImm32(state.callSiteIndexForExceptionHandlingOrOriginal().bits()),
CCallHelpers::tagFor(static_cast<VirtualRegister>(CallFrameSlot::argumentCount)));
jit.makeSpaceOnStackForCCall();
jit.setupArgumentsWithExecState(std::get<ArgumentsIndex>(m_arguments)...);
CCallHelpers::Call operationCall = jit.call();
auto function = m_function;
jit.addLinkTask([=] (LinkBuffer& linkBuffer) {
linkBuffer.link(operationCall, FunctionPtr(function));
});
jit.setupResults(m_result);
jit.reclaimSpaceOnStackForCCall();
CCallHelpers::Jump noException = jit.emitExceptionCheck(state.m_vm, CCallHelpers::InvertedExceptionCheck);
state.restoreLiveRegistersFromStackForCallWithThrownException(spillState);
exceptions.append(jit.jump());
noException.link(&jit);
RegisterSet dontRestore;
dontRestore.set(m_result);
state.restoreLiveRegistersFromStackForCall(spillState, dontRestore);
return exceptions;
}
CCallHelpers::JumpList generate(AccessGenerationState& state, const RegisterSet& usedRegistersBySnippet, CCallHelpers& jit) override
{
m_from.link(&jit);
CCallHelpers::JumpList exceptions = generateImpl(state, usedRegistersBySnippet, jit, std::make_index_sequence<std::tuple_size<std::tuple<Arguments...>>::value>());
jit.jump().linkTo(m_to, &jit);
return exceptions;
}
protected:
JumpType m_from;
CCallHelpers::Label m_to;
FunctionType m_function;
ResultType m_result;
std::tuple<Arguments...> m_arguments;
};
#define JSC_DEFINE_CALL_OPERATIONS(OperationType, ResultType, ...) \
void AccessCaseSnippetParams::addSlowPathCallImpl(CCallHelpers::JumpList from, CCallHelpers& jit, OperationType operation, ResultType result, std::tuple<__VA_ARGS__> args) \
{ \
CCallHelpers::Label to = jit.label(); \
m_generators.append(std::make_unique<SlowPathCallGeneratorWithArguments<CCallHelpers::JumpList, OperationType, ResultType, __VA_ARGS__>>(from, to, operation, result, args)); \
} \
SNIPPET_SLOW_PATH_CALLS(JSC_DEFINE_CALL_OPERATIONS)
#undef JSC_DEFINE_CALL_OPERATIONS
CCallHelpers::JumpList AccessCaseSnippetParams::emitSlowPathCalls(AccessGenerationState& state, const RegisterSet& usedRegistersBySnippet, CCallHelpers& jit)
{
CCallHelpers::JumpList exceptions;
for (auto& generator : m_generators)
exceptions.append(generator->generate(state, usedRegistersBySnippet, jit));
return exceptions;
}
}
#endif