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// Copyright 2015 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.
#ifndef V8_WASM_RESULT_H_
#define V8_WASM_RESULT_H_
#include <memory>
#include "src/base/compiler-specific.h"
#include "src/handles.h"
#include "src/globals.h"
namespace v8 {
namespace internal {
class Isolate;
namespace wasm {
// Error codes for programmatic checking of the decoder's verification.
enum ErrorCode {
kSuccess,
kError, // TODO(titzer): remove me
kOutOfMemory, // decoder ran out of memory
kEndOfCode, // end of code reached prematurely
kInvalidOpcode, // found invalid opcode
kUnreachableCode, // found unreachable code
kImproperContinue, // improperly nested continue
kImproperBreak, // improperly nested break
kReturnCount, // return count mismatch
kTypeError, // type mismatch
kInvalidLocalIndex, // invalid local
kInvalidGlobalIndex, // invalid global
kInvalidFunctionIndex, // invalid function
kInvalidMemType // invalid memory type
};
// The overall result of decoding a function or a module.
template <typename T>
struct Result {
Result() : val(), error_code(kSuccess), start(nullptr), error_pc(nullptr) {}
Result(Result&& other) { *this = std::move(other); }
Result& operator=(Result&& other) {
MoveFrom(other);
val = other.val;
return *this;
}
T val;
ErrorCode error_code;
const byte* start;
const byte* error_pc;
const byte* error_pt;
std::unique_ptr<char[]> error_msg;
bool ok() const { return error_code == kSuccess; }
bool failed() const { return error_code != kSuccess; }
template <typename V>
void MoveFrom(Result<V>& that) {
error_code = that.error_code;
start = that.start;
error_pc = that.error_pc;
error_pt = that.error_pt;
error_msg = std::move(that.error_msg);
}
private:
DISALLOW_COPY_AND_ASSIGN(Result);
};
template <typename T>
std::ostream& operator<<(std::ostream& os, const Result<T>& result) {
os << "Result = ";
if (result.ok()) {
if (result.val != nullptr) {
os << *result.val;
} else {
os << "success (no value)";
}
} else if (result.error_msg.get() != nullptr) {
ptrdiff_t offset = result.error_pc - result.start;
if (offset < 0) {
os << result.error_msg.get() << " @" << offset;
} else {
os << result.error_msg.get() << " @+" << offset;
}
} else {
os << result.error_code;
}
os << std::endl;
return os;
}
std::ostream& operator<<(std::ostream& os, const ErrorCode& error_code);
// A helper for generating error messages that bubble up to JS exceptions.
class ErrorThrower {
public:
ErrorThrower(Isolate* isolate, const char* context)
: isolate_(isolate), context_(context) {}
~ErrorThrower();
PRINTF_FORMAT(2, 3) void Error(const char* fmt, ...);
template <typename T>
void Failed(const char* error, Result<T>& result) {
std::ostringstream str;
str << error << result;
return Error("%s", str.str().c_str());
}
i::Handle<i::String> Reify() {
auto result = message_;
message_ = i::Handle<i::String>();
return result;
}
bool error() const { return !message_.is_null(); }
private:
Isolate* isolate_;
const char* context_;
i::Handle<i::String> message_;
};
} // namespace wasm
} // namespace internal
} // namespace v8
#endif
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