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#include "eval/eval/evaluator_core.h"
#include <memory>
#include <set>
#include <string>
#include <utility>
#include "absl/functional/function_ref.h"
#include "absl/status/status.h"
#include "absl/status/statusor.h"
#include "absl/strings/string_view.h"
#include "absl/types/optional.h"
#include "base/type_provider.h"
#include "base/value_factory.h"
#include "eval/eval/attribute_trail.h"
#include "eval/internal/interop.h"
#include "eval/public/cel_expression.h"
#include "eval/public/cel_value.h"
#include "extensions/protobuf/memory_manager.h"
#include "internal/casts.h"
#include "internal/status_macros.h"
namespace google::api::expr::runtime {
namespace {
absl::Status InvalidIterationStateError() {
return absl::InternalError(
"Attempted to access iteration variable outside of comprehension.");
}
} // namespace
// TODO(issues/5): cel::TypeFactory and family are setup here assuming legacy
// value interop. Later, these will need to be configurable by clients.
CelExpressionFlatEvaluationState::CelExpressionFlatEvaluationState(
size_t value_stack_size, google::protobuf::Arena* arena)
: memory_manager_(arena),
value_stack_(value_stack_size),
type_factory_(memory_manager_),
type_manager_(type_factory_, cel::TypeProvider::Builtin()),
value_factory_(type_manager_) {}
void CelExpressionFlatEvaluationState::Reset() {
iter_stack_.clear();
value_stack_.Clear();
}
const ExpressionStep* ExecutionFrame::Next() {
size_t end_pos = execution_path_.size();
if (pc_ < end_pos) return execution_path_[pc_++].get();
if (pc_ > end_pos) {
ABSL_LOG(ERROR) << "Attempting to step beyond the end of execution path.";
}
return nullptr;
}
absl::Status ExecutionFrame::PushIterFrame(absl::string_view iter_var_name,
absl::string_view accu_var_name) {
CelExpressionFlatEvaluationState::IterFrame frame;
frame.iter_var = {iter_var_name, cel::Handle<cel::Value>(), AttributeTrail()};
frame.accu_var = {accu_var_name, cel::Handle<cel::Value>(), AttributeTrail()};
state_->iter_stack().push_back(std::move(frame));
return absl::OkStatus();
}
absl::Status ExecutionFrame::PopIterFrame() {
if (state_->iter_stack().empty()) {
return absl::InternalError("Loop stack underflow.");
}
state_->iter_stack().pop_back();
return absl::OkStatus();
}
absl::Status ExecutionFrame::SetAccuVar(cel::Handle<cel::Value> value) {
return SetAccuVar(std::move(value), AttributeTrail());
}
absl::Status ExecutionFrame::SetAccuVar(cel::Handle<cel::Value> value,
AttributeTrail trail) {
if (state_->iter_stack().empty()) {
return InvalidIterationStateError();
}
auto& iter = state_->IterStackTop();
iter.accu_var.value = std::move(value);
iter.accu_var.attr_trail = std::move(trail);
return absl::OkStatus();
}
absl::Status ExecutionFrame::SetIterVar(cel::Handle<cel::Value> value,
AttributeTrail trail) {
if (state_->iter_stack().empty()) {
return InvalidIterationStateError();
}
auto& iter = state_->IterStackTop();
iter.iter_var.value = std::move(value);
iter.iter_var.attr_trail = std::move(trail);
return absl::OkStatus();
}
absl::Status ExecutionFrame::SetIterVar(cel::Handle<cel::Value> value) {
return SetIterVar(std::move(value), AttributeTrail());
}
absl::Status ExecutionFrame::ClearIterVar() {
if (state_->iter_stack().empty()) {
return InvalidIterationStateError();
}
state_->IterStackTop().iter_var.value = cel::Handle<cel::Value>();
return absl::OkStatus();
}
bool ExecutionFrame::GetIterVar(absl::string_view name,
cel::Handle<cel::Value>* value,
AttributeTrail* trail) const {
for (auto iter = state_->iter_stack().rbegin();
iter != state_->iter_stack().rend(); ++iter) {
auto& frame = *iter;
if (frame.iter_var.value && name == frame.iter_var.name) {
if (value != nullptr) {
*value = frame.iter_var.value;
}
if (trail != nullptr) {
*trail = frame.iter_var.attr_trail;
}
return true;
}
if (frame.accu_var.value && name == frame.accu_var.name) {
if (value != nullptr) {
*value = frame.accu_var.value;
}
if (trail != nullptr) {
*trail = frame.accu_var.attr_trail;
}
return true;
}
}
return false;
}
std::unique_ptr<CelEvaluationState> CelExpressionFlatImpl::InitializeState(
google::protobuf::Arena* arena) const {
return std::make_unique<CelExpressionFlatEvaluationState>(path_.size(),
arena);
}
absl::StatusOr<CelValue> CelExpressionFlatImpl::Evaluate(
const BaseActivation& activation, CelEvaluationState* state) const {
return Trace(activation, state, CelEvaluationListener());
}
absl::StatusOr<cel::Handle<cel::Value>> ExecutionFrame::Evaluate(
const CelEvaluationListener& listener) {
size_t initial_stack_size = value_stack().size();
const ExpressionStep* expr;
google::protobuf::Arena* arena = cel::extensions::ProtoMemoryManager::CastToProtoArena(
value_factory().memory_manager());
while ((expr = Next()) != nullptr) {
CEL_RETURN_IF_ERROR(expr->Evaluate(this));
if (!listener ||
// This step was added during compilation (e.g. Int64ConstImpl).
!expr->ComesFromAst()) {
continue;
}
if (value_stack().empty()) {
ABSL_LOG(ERROR) << "Stack is empty after a ExpressionStep.Evaluate. "
"Try to disable short-circuiting.";
continue;
}
CEL_RETURN_IF_ERROR(
listener(expr->id(),
cel::interop_internal::ModernValueToLegacyValueOrDie(
arena, value_stack().Peek()),
arena));
}
size_t final_stack_size = value_stack().size();
if (final_stack_size != initial_stack_size + 1 || final_stack_size == 0) {
return absl::Status(absl::StatusCode::kInternal,
"Stack error during evaluation");
}
cel::Handle<cel::Value> value = value_stack().Peek();
value_stack().Pop(1);
return value;
}
absl::StatusOr<CelValue> CelExpressionFlatImpl::Trace(
const BaseActivation& activation, CelEvaluationState* _state,
CelEvaluationListener callback) const {
auto state =
::cel::internal::down_cast<CelExpressionFlatEvaluationState*>(_state);
state->Reset();
ExecutionFrame frame(path_, activation, &type_registry_, options_, state);
CEL_ASSIGN_OR_RETURN(cel::Handle<cel::Value> value, frame.Evaluate(callback));
return cel::interop_internal::ModernValueToLegacyValueOrDie(state->arena(),
value);
}
} // namespace google::api::expr::runtime