v8/include/v8-callbacks.h
Clemens Backes 6a977bd1fd [wasm] Deprecate "dynamic tiering enabled" callback
Dynamic tiering is now enabled by default, and the origin trial is
expired, so the callback can be removed.
The callback was already never called, because the flag value is always
checked first.

R=ahaas@chromium.org, mlippautz@chromium.org

Bug: v8:12281
Change-Id: I58eaa210c86024128328a13ba07bb8fc1b437841
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3644951
Commit-Queue: Clemens Backes <clemensb@chromium.org>
Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Reviewed-by: Andreas Haas <ahaas@chromium.org>
Cr-Commit-Position: refs/heads/main@{#80633}
2022-05-19 09:59:43 +00:00

412 lines
14 KiB
C++

// Copyright 2021 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 INCLUDE_V8_ISOLATE_CALLBACKS_H_
#define INCLUDE_V8_ISOLATE_CALLBACKS_H_
#include <stddef.h>
#include <string>
#include "cppgc/common.h"
#include "v8-data.h" // NOLINT(build/include_directory)
#include "v8-local-handle.h" // NOLINT(build/include_directory)
#include "v8config.h" // NOLINT(build/include_directory)
#if defined(V8_OS_WIN)
struct _EXCEPTION_POINTERS;
#endif
namespace v8 {
template <typename T>
class FunctionCallbackInfo;
class Isolate;
class Message;
class Module;
class Object;
class Promise;
class ScriptOrModule;
class String;
class UnboundScript;
class Value;
/**
* A JIT code event is issued each time code is added, moved or removed.
*
* \note removal events are not currently issued.
*/
struct JitCodeEvent {
enum EventType {
CODE_ADDED,
CODE_MOVED,
CODE_REMOVED,
CODE_ADD_LINE_POS_INFO,
CODE_START_LINE_INFO_RECORDING,
CODE_END_LINE_INFO_RECORDING
};
// Definition of the code position type. The "POSITION" type means the place
// in the source code which are of interest when making stack traces to
// pin-point the source location of a stack frame as close as possible.
// The "STATEMENT_POSITION" means the place at the beginning of each
// statement, and is used to indicate possible break locations.
enum PositionType { POSITION, STATEMENT_POSITION };
// There are three different kinds of CodeType, one for JIT code generated
// by the optimizing compiler, one for byte code generated for the
// interpreter, and one for code generated from Wasm. For JIT_CODE and
// WASM_CODE, |code_start| points to the beginning of jitted assembly code,
// while for BYTE_CODE events, |code_start| points to the first bytecode of
// the interpreted function.
enum CodeType { BYTE_CODE, JIT_CODE, WASM_CODE };
// Type of event.
EventType type;
CodeType code_type;
// Start of the instructions.
void* code_start;
// Size of the instructions.
size_t code_len;
// Script info for CODE_ADDED event.
Local<UnboundScript> script;
// User-defined data for *_LINE_INFO_* event. It's used to hold the source
// code line information which is returned from the
// CODE_START_LINE_INFO_RECORDING event. And it's passed to subsequent
// CODE_ADD_LINE_POS_INFO and CODE_END_LINE_INFO_RECORDING events.
void* user_data;
struct name_t {
// Name of the object associated with the code, note that the string is not
// zero-terminated.
const char* str;
// Number of chars in str.
size_t len;
};
struct line_info_t {
// PC offset
size_t offset;
// Code position
size_t pos;
// The position type.
PositionType position_type;
};
struct wasm_source_info_t {
// Source file name.
const char* filename;
// Length of filename.
size_t filename_size;
// Line number table, which maps offsets of JITted code to line numbers of
// source file.
const line_info_t* line_number_table;
// Number of entries in the line number table.
size_t line_number_table_size;
};
wasm_source_info_t* wasm_source_info;
union {
// Only valid for CODE_ADDED.
struct name_t name;
// Only valid for CODE_ADD_LINE_POS_INFO
struct line_info_t line_info;
// New location of instructions. Only valid for CODE_MOVED.
void* new_code_start;
};
Isolate* isolate;
};
/**
* Option flags passed to the SetJitCodeEventHandler function.
*/
enum JitCodeEventOptions {
kJitCodeEventDefault = 0,
// Generate callbacks for already existent code.
kJitCodeEventEnumExisting = 1
};
/**
* Callback function passed to SetJitCodeEventHandler.
*
* \param event code add, move or removal event.
*/
using JitCodeEventHandler = void (*)(const JitCodeEvent* event);
// --- Garbage Collection Callbacks ---
/**
* Applications can register callback functions which will be called before and
* after certain garbage collection operations. Allocations are not allowed in
* the callback functions, you therefore cannot manipulate objects (set or
* delete properties for example) since it is possible such operations will
* result in the allocation of objects.
*/
enum GCType {
kGCTypeScavenge = 1 << 0,
kGCTypeMinorMarkCompact = 1 << 1,
kGCTypeMarkSweepCompact = 1 << 2,
kGCTypeIncrementalMarking = 1 << 3,
kGCTypeProcessWeakCallbacks = 1 << 4,
kGCTypeAll = kGCTypeScavenge | kGCTypeMinorMarkCompact |
kGCTypeMarkSweepCompact | kGCTypeIncrementalMarking |
kGCTypeProcessWeakCallbacks
};
/**
* GCCallbackFlags is used to notify additional information about the GC
* callback.
* - kGCCallbackFlagConstructRetainedObjectInfos: The GC callback is for
* constructing retained object infos.
* - kGCCallbackFlagForced: The GC callback is for a forced GC for testing.
* - kGCCallbackFlagSynchronousPhantomCallbackProcessing: The GC callback
* is called synchronously without getting posted to an idle task.
* - kGCCallbackFlagCollectAllAvailableGarbage: The GC callback is called
* in a phase where V8 is trying to collect all available garbage
* (e.g., handling a low memory notification).
* - kGCCallbackScheduleIdleGarbageCollection: The GC callback is called to
* trigger an idle garbage collection.
*/
enum GCCallbackFlags {
kNoGCCallbackFlags = 0,
kGCCallbackFlagConstructRetainedObjectInfos = 1 << 1,
kGCCallbackFlagForced = 1 << 2,
kGCCallbackFlagSynchronousPhantomCallbackProcessing = 1 << 3,
kGCCallbackFlagCollectAllAvailableGarbage = 1 << 4,
kGCCallbackFlagCollectAllExternalMemory = 1 << 5,
kGCCallbackScheduleIdleGarbageCollection = 1 << 6,
};
using GCCallback = void (*)(GCType type, GCCallbackFlags flags);
using InterruptCallback = void (*)(Isolate* isolate, void* data);
/**
* This callback is invoked when the heap size is close to the heap limit and
* V8 is likely to abort with out-of-memory error.
* The callback can extend the heap limit by returning a value that is greater
* than the current_heap_limit. The initial heap limit is the limit that was
* set after heap setup.
*/
using NearHeapLimitCallback = size_t (*)(void* data, size_t current_heap_limit,
size_t initial_heap_limit);
/**
* Callback function passed to SetUnhandledExceptionCallback.
*/
#if defined(V8_OS_WIN)
using UnhandledExceptionCallback =
int (*)(_EXCEPTION_POINTERS* exception_pointers);
#endif
// --- Counters Callbacks ---
using CounterLookupCallback = int* (*)(const char* name);
using CreateHistogramCallback = void* (*)(const char* name, int min, int max,
size_t buckets);
using AddHistogramSampleCallback = void (*)(void* histogram, int sample);
// --- Exceptions ---
using FatalErrorCallback = void (*)(const char* location, const char* message);
using LegacyOOMErrorCallback V8_DEPRECATE_SOON(
"Use OOMErrorCallback (https://crbug.com/1323177)") =
void (*)(const char* location, bool is_heap_oom);
struct OOMDetails {
bool is_heap_oom = false;
const char* detail = nullptr;
};
using OOMErrorCallback = void (*)(const char* location,
const OOMDetails& details);
using MessageCallback = void (*)(Local<Message> message, Local<Value> data);
// --- Tracing ---
enum LogEventStatus : int { kStart = 0, kEnd = 1, kStamp = 2 };
using LogEventCallback = void (*)(const char* name,
int /* LogEventStatus */ status);
// --- Crashkeys Callback ---
enum class CrashKeyId {
kIsolateAddress,
kReadonlySpaceFirstPageAddress,
kMapSpaceFirstPageAddress,
kCodeSpaceFirstPageAddress,
kDumpType,
kSnapshotChecksumCalculated,
kSnapshotChecksumExpected,
};
using AddCrashKeyCallback = void (*)(CrashKeyId id, const std::string& value);
// --- Enter/Leave Script Callback ---
using BeforeCallEnteredCallback = void (*)(Isolate*);
using CallCompletedCallback = void (*)(Isolate*);
// --- AllowCodeGenerationFromStrings callbacks ---
/**
* Callback to check if code generation from strings is allowed. See
* Context::AllowCodeGenerationFromStrings.
*/
using AllowCodeGenerationFromStringsCallback = bool (*)(Local<Context> context,
Local<String> source);
struct ModifyCodeGenerationFromStringsResult {
// If true, proceed with the codegen algorithm. Otherwise, block it.
bool codegen_allowed = false;
// Overwrite the original source with this string, if present.
// Use the original source if empty.
// This field is considered only if codegen_allowed is true.
MaybeLocal<String> modified_source;
};
/**
* Access type specification.
*/
enum AccessType {
ACCESS_GET,
ACCESS_SET,
ACCESS_HAS,
ACCESS_DELETE,
ACCESS_KEYS
};
// --- Failed Access Check Callback ---
using FailedAccessCheckCallback = void (*)(Local<Object> target,
AccessType type, Local<Value> data);
/**
* Callback to check if codegen is allowed from a source object, and convert
* the source to string if necessary. See: ModifyCodeGenerationFromStrings.
*/
using ModifyCodeGenerationFromStringsCallback =
ModifyCodeGenerationFromStringsResult (*)(Local<Context> context,
Local<Value> source);
using ModifyCodeGenerationFromStringsCallback2 =
ModifyCodeGenerationFromStringsResult (*)(Local<Context> context,
Local<Value> source,
bool is_code_like);
// --- WebAssembly compilation callbacks ---
using ExtensionCallback = bool (*)(const FunctionCallbackInfo<Value>&);
using AllowWasmCodeGenerationCallback = bool (*)(Local<Context> context,
Local<String> source);
// --- Callback for APIs defined on v8-supported objects, but implemented
// by the embedder. Example: WebAssembly.{compile|instantiate}Streaming ---
using ApiImplementationCallback = void (*)(const FunctionCallbackInfo<Value>&);
// --- Callback for WebAssembly.compileStreaming ---
using WasmStreamingCallback = void (*)(const FunctionCallbackInfo<Value>&);
// --- Callback for loading source map file for Wasm profiling support
using WasmLoadSourceMapCallback = Local<String> (*)(Isolate* isolate,
const char* name);
// --- Callback for checking if WebAssembly Simd is enabled ---
using WasmSimdEnabledCallback = bool (*)(Local<Context> context);
// --- Callback for checking if WebAssembly exceptions are enabled ---
using WasmExceptionsEnabledCallback = bool (*)(Local<Context> context);
// --- Callback for checking if WebAssembly dynamic tiering is enabled ---
using WasmDynamicTieringEnabledCallback V8_DEPRECATE_SOON(
"Dynamic tiering is now enabled by default") =
bool (*)(Local<Context> context);
// --- Callback for checking if the SharedArrayBuffer constructor is enabled ---
using SharedArrayBufferConstructorEnabledCallback =
bool (*)(Local<Context> context);
/**
* HostImportModuleDynamicallyCallback is called when we
* require the embedder to load a module. This is used as part of the dynamic
* import syntax.
*
* The referrer contains metadata about the script/module that calls
* import.
*
* The specifier is the name of the module that should be imported.
*
* The import_assertions are import assertions for this request in the form:
* [key1, value1, key2, value2, ...] where the keys and values are of type
* v8::String. Note, unlike the FixedArray passed to ResolveModuleCallback and
* returned from ModuleRequest::GetImportAssertions(), this array does not
* contain the source Locations of the assertions.
*
* The embedder must compile, instantiate, evaluate the Module, and
* obtain its namespace object.
*
* The Promise returned from this function is forwarded to userland
* JavaScript. The embedder must resolve this promise with the module
* namespace object. In case of an exception, the embedder must reject
* this promise with the exception. If the promise creation itself
* fails (e.g. due to stack overflow), the embedder must propagate
* that exception by returning an empty MaybeLocal.
*/
using HostImportModuleDynamicallyWithImportAssertionsCallback =
MaybeLocal<Promise> (*)(Local<Context> context,
Local<ScriptOrModule> referrer,
Local<String> specifier,
Local<FixedArray> import_assertions);
using HostImportModuleDynamicallyCallback = MaybeLocal<Promise> (*)(
Local<Context> context, Local<Data> host_defined_options,
Local<Value> resource_name, Local<String> specifier,
Local<FixedArray> import_assertions);
/**
* HostInitializeImportMetaObjectCallback is called the first time import.meta
* is accessed for a module. Subsequent access will reuse the same value.
*
* The method combines two implementation-defined abstract operations into one:
* HostGetImportMetaProperties and HostFinalizeImportMeta.
*
* The embedder should use v8::Object::CreateDataProperty to add properties on
* the meta object.
*/
using HostInitializeImportMetaObjectCallback = void (*)(Local<Context> context,
Local<Module> module,
Local<Object> meta);
/**
* HostCreateShadowRealmContextCallback is called each time a ShadowRealm is
* being constructed in the initiator_context.
*
* The method combines Context creation and implementation defined abstract
* operation HostInitializeShadowRealm into one.
*
* The embedder should use v8::Context::New or v8::Context:NewFromSnapshot to
* create a new context. If the creation fails, the embedder must propagate
* that exception by returning an empty MaybeLocal.
*/
using HostCreateShadowRealmContextCallback =
MaybeLocal<Context> (*)(Local<Context> initiator_context);
/**
* PrepareStackTraceCallback is called when the stack property of an error is
* first accessed. The return value will be used as the stack value. If this
* callback is registed, the |Error.prepareStackTrace| API will be disabled.
* |sites| is an array of call sites, specified in
* https://v8.dev/docs/stack-trace-api
*/
using PrepareStackTraceCallback = MaybeLocal<Value> (*)(Local<Context> context,
Local<Value> error,
Local<Array> sites);
} // namespace v8
#endif // INCLUDE_V8_ISOLATE_CALLBACKS_H_