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// Copyright 2019 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 "include/v8.h"
#include "include/v8config.h"
#include "src/common/globals.h"
#if defined(V8_OS_WIN_X64)
#include "src/base/win32-headers.h"
namespace v8 {
namespace internal {
namespace win64_unwindinfo {
#define CRASH_HANDLER_FUNCTION_NAME CrashForExceptionInNonABICompliantCodeRange
static const int kPushRbpInstructionLength = 1;
static const int kMovRbpRspInstructionLength = 3;
static const int kRbpPrefixCodes = 2;
static const int kRbpPrefixLength =
kPushRbpInstructionLength + kMovRbpRspInstructionLength;
* Returns true if V8 is configured to emit unwinding data for embedded in the
* pdata/xdata sections of the executable. Currently, this happens when V8 is
* built with "v8_win64_unwinding_info = true".
bool CanEmitUnwindInfoForBuiltins();
* Returns true if V8 if we can register unwinding data for the whole code range
* of an isolate or WASM module. The first page of the code range is reserved
* and writable, to be used to store unwind data, as documented in:
* In jitless mode V8 does not allocate any executable memory itself so the only
* non-abi-compliant code range is in the embedded blob.
bool CanRegisterUnwindInfoForNonABICompliantCodeRange();
* Registers a custom exception handler for exceptions in V8-generated code.
void SetUnhandledExceptionCallback(
v8::UnhandledExceptionCallback unhandled_exception_callback);
* Returns a vector of bytes that contains the Win64 unwind data used for all
* V8 builtin functions.
std::vector<uint8_t> GetUnwindInfoForBuiltinFunctions();
void RegisterNonABICompliantCodeRange(void* start, size_t size_in_bytes);
void UnregisterNonABICompliantCodeRange(void* start);
class BuiltinUnwindInfo {
BuiltinUnwindInfo() : is_leaf_function_(true) {}
explicit BuiltinUnwindInfo(const std::vector<int>& fp_offsets)
: is_leaf_function_(false), fp_offsets_(fp_offsets) {}
bool is_leaf_function() const { return is_leaf_function_; }
const std::vector<int>& fp_offsets() const { return fp_offsets_; }
bool is_leaf_function_;
std::vector<int> fp_offsets_;
class XdataEncoder {
explicit XdataEncoder(const Assembler& assembler)
: assembler_(assembler), current_push_rbp_offset_(-1) {}
void onPushRbp();
void onMovRbpRsp();
BuiltinUnwindInfo unwinding_info() const {
return BuiltinUnwindInfo(fp_offsets_);
const Assembler& assembler_;
std::vector<int> fp_offsets_;
int current_push_rbp_offset_;
} // namespace win64_unwindinfo
} // namespace internal
} // namespace v8
#endif // defined(V8_OS_WIN_X64)