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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.
#include "src/wasm/wasm-result.h"
#include "src/execution/isolate-inl.h"
#include "src/heap/factory.h"
#include "src/heap/heap.h"
#include "src/objects/objects.h"
#include "src/base/platform/platform.h"
namespace v8 {
namespace internal {
namespace wasm {
namespace {
PRINTF_FORMAT(3, 0)
void VPrintFToString(std::string& str, size_t str_offset, const char* format,
va_list args) {
DCHECK_LE(str_offset, str.size());
size_t len = str_offset + strlen(format);
// Allocate increasingly large buffers until the message fits.
for (;; len = base::bits::RoundUpToPowerOfTwo64(len + 1)) {
DCHECK_GE(kMaxInt, len);
str.resize(len);
va_list args_copy;
va_copy(args_copy, args);
int written = VSNPrintF(Vector<char>(&str.front() + str_offset,
static_cast<int>(len - str_offset)),
format, args_copy);
va_end(args_copy);
if (written < 0) continue; // not enough space.
str.resize(str_offset + written);
return;
}
}
PRINTF_FORMAT(3, 4)
void PrintFToString(std::string& str, size_t str_offset, const char* format,
...) {
va_list args;
va_start(args, format);
VPrintFToString(str, str_offset, format, args);
va_end(args);
}
} // namespace
// static
std::string WasmError::FormatError(const char* format, va_list args) {
std::string result;
VPrintFToString(result, 0, format, args);
return result;
}
void ErrorThrower::Format(ErrorType type, const char* format, va_list args) {
DCHECK_NE(kNone, type);
// Only report the first error.
if (error()) return;
size_t context_len = 0;
if (context_) {
PrintFToString(error_msg_, 0, "%s: ", context_);
context_len = error_msg_.size();
}
VPrintFToString(error_msg_, context_len, format, args);
error_type_ = type;
}
void ErrorThrower::TypeError(const char* format, ...) {
va_list arguments;
va_start(arguments, format);
Format(kTypeError, format, arguments);
va_end(arguments);
}
void ErrorThrower::RangeError(const char* format, ...) {
va_list arguments;
va_start(arguments, format);
Format(kRangeError, format, arguments);
va_end(arguments);
}
void ErrorThrower::CompileError(const char* format, ...) {
va_list arguments;
va_start(arguments, format);
Format(kCompileError, format, arguments);
va_end(arguments);
}
void ErrorThrower::LinkError(const char* format, ...) {
va_list arguments;
va_start(arguments, format);
Format(kLinkError, format, arguments);
va_end(arguments);
}
void ErrorThrower::RuntimeError(const char* format, ...) {
va_list arguments;
va_start(arguments, format);
Format(kRuntimeError, format, arguments);
va_end(arguments);
}
Handle<Object> ErrorThrower::Reify() {
Handle<JSFunction> constructor;
switch (error_type_) {
case kNone:
UNREACHABLE();
case kTypeError:
constructor = isolate_->type_error_function();
break;
case kRangeError:
constructor = isolate_->range_error_function();
break;
case kCompileError:
constructor = isolate_->wasm_compile_error_function();
break;
case kLinkError:
constructor = isolate_->wasm_link_error_function();
break;
case kRuntimeError:
constructor = isolate_->wasm_runtime_error_function();
break;
}
Handle<String> message = isolate_->factory()
->NewStringFromUtf8(VectorOf(error_msg_))
.ToHandleChecked();
Reset();
return isolate_->factory()->NewError(constructor, message);
}
void ErrorThrower::Reset() {
error_type_ = kNone;
error_msg_.clear();
}
ErrorThrower::ErrorThrower(ErrorThrower&& other) V8_NOEXCEPT
: isolate_(other.isolate_),
context_(other.context_),
error_type_(other.error_type_),
error_msg_(std::move(other.error_msg_)) {
other.error_type_ = kNone;
}
ErrorThrower::~ErrorThrower() {
if (error() && !isolate_->has_pending_exception()) {
// We don't want to mix pending exceptions and scheduled exceptions, hence
// an existing exception should be pending, never scheduled.
DCHECK(!isolate_->has_scheduled_exception());
isolate_->Throw(*Reify());
}
}
} // namespace wasm
} // namespace internal
} // namespace v8
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