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// Copyright 2022 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "src/wasm/constant-expression.h"
#include "src/handles/handles.h"
#include "src/heap/factory-inl.h"
#include "src/heap/factory.h"
#include "src/objects/oddball.h"
#include "src/roots/roots.h"
#include "src/wasm/constant-expression-interface.h"
#include "src/wasm/function-body-decoder-impl.h"
#include "src/wasm/wasm-code-manager.h"
#include "src/wasm/wasm-module.h"
#include "src/wasm/wasm-objects.h"
#include "src/wasm/wasm-opcodes-inl.h"
namespace v8 {
namespace internal {
namespace wasm {
WireBytesRef ConstantExpression::wire_bytes_ref() const {
DCHECK_EQ(kind(), kWireBytesRef);
return WireBytesRef(OffsetField::decode(bit_field_),
LengthField::decode(bit_field_));
}
ValueOrError EvaluateConstantExpression(Zone* zone, ConstantExpression expr,
ValueType expected, Isolate* isolate,
Handle<WasmInstanceObject> instance) {
switch (expr.kind()) {
case ConstantExpression::kEmpty:
UNREACHABLE();
case ConstantExpression::kI32Const:
return WasmValue(expr.i32_value());
case ConstantExpression::kRefNull:
return WasmValue(
expected == kWasmExternRef || expected == kWasmNullExternRef
? Handle<Object>::cast(isolate->factory()->null_value())
: Handle<Object>::cast(isolate->factory()->wasm_null()),
ValueType::RefNull(expr.repr()));
case ConstantExpression::kRefFunc: {
uint32_t index = expr.index();
Handle<Object> value =
WasmInstanceObject::GetOrCreateWasmInternalFunction(isolate, instance,
index);
return WasmValue(value, expected);
}
case ConstantExpression::kWireBytesRef: {
WireBytesRef ref = expr.wire_bytes_ref();
base::Vector<const uint8_t> module_bytes =
instance->module_object()->native_module()->wire_bytes();
const uint8_t* start = module_bytes.begin() + ref.offset();
const uint8_t* end = module_bytes.begin() + ref.end_offset();
auto sig = FixedSizeSignature<ValueType>::Returns(expected);
FunctionBody body(&sig, ref.offset(), start, end);
WasmFeatures detected;
// We use FullValidationTag so we do not have to create another template
// instance of WasmFullDecoder, which would cost us >50Kb binary code
// size.
WasmFullDecoder<Decoder::FullValidationTag, ConstantExpressionInterface,
kConstantExpression>
decoder(zone, instance->module(), WasmFeatures::All(), &detected,
body, instance->module(), isolate, instance);
decoder.DecodeFunctionBody();
return decoder.interface().has_error()
? ValueOrError(decoder.interface().error())
: ValueOrError(decoder.interface().computed_value());
}
}
}
} // namespace wasm
} // namespace internal
} // namespace v8
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