Classes
struct	CodeProtectionInfo

struct	CodeProtectionInfoListEntry

class	MetadataLock

struct	ProtectedInstructionData

struct	SandboxRecord

class	SandboxRecordsLock

Functions
void	HandleSignal (int signum, siginfo_t info, void context)

bool	TryHandleSignal (int signum, siginfo_t info, void context)

LONG WINAPI	HandleWasmTrap (EXCEPTION_POINTERS *exception)

TH_DISABLE_ASAN bool	TryHandleWasmTrap (EXCEPTION_POINTERS *exception)

constexpr size_t	HandlerDataSize (size_t num_protected_instructions)

CodeProtectionInfo *	CreateHandlerData (uintptr_t base, size_t size, size_t num_protected_instructions, const ProtectedInstructionData *protected_instructions)

int	RegisterHandlerData (uintptr_t base, size_t size, size_t num_protected_instructions, const ProtectedInstructionData *protected_instructions)

void	ReleaseHandlerData (int index)

bool	RegisterV8Sandbox (uintptr_t base, size_t size)

void	UnregisterV8Sandbox (uintptr_t base, size_t size)

int *	GetThreadInWasmThreadLocalAddress ()

size_t	GetRecoveredTrapCount ()

bool	RegisterDefaultTrapHandler ()

void	RemoveTrapHandler ()

bool	EnableTrapHandler (bool use_v8_handler)

void	SetLandingPad (uintptr_t landing_pad)

bool	IsFaultAddressCovered (uintptr_t fault_addr)

bool	IsAccessedMemoryCovered (uintptr_t accessed_addr)

bool	IsTrapHandlerEnabled ()

TH_DISABLE_ASAN bool	IsThreadInWasm ()

void	SetThreadInWasm ()

void	ClearThreadInWasm ()

void	AssertThreadNotInWasm ()

Variables
constexpr size_t	kInitialCodeObjectSize = 1024

constexpr size_t	kCodeObjectGrowthFactor = 2

bool	g_is_trap_handler_enabled {false}

std::atomic< bool >	g_can_enable_trap_handler {true}

thread_local int	g_thread_in_wasm_code

size_t	gNumCodeObjects = 0

CodeProtectionInfoListEntry *	gCodeObjects = nullptr

SandboxRecord *	gSandboxRecordsHead = nullptr

std::atomic_size_t	gRecoveredTrapCount = {0}

std::atomic< uintptr_t >	gLandingPad = {0}

const int	kInvalidIndex = -1

Function Documentation

◆ AssertThreadNotInWasm()

void v8::internal::trap_handler::AssertThreadNotInWasm ( )

inline

Definition at line 216 of file trap-handler.h.

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◆ ClearThreadInWasm()

void v8::internal::trap_handler::ClearThreadInWasm ( )

inline

Definition at line 195 of file trap-handler.h.

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◆ CreateHandlerData()

CodeProtectionInfo * v8::internal::trap_handler::CreateHandlerData	(	uintptr_t	base,
		size_t	size,
		size_t	num_protected_instructions,
		const ProtectedInstructionData *	protected_instructions )

Definition at line 108 of file handler-outside.cc.

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◆ EnableTrapHandler()

TH_EXPORT_PRIVATE bool v8::internal::trap_handler::EnableTrapHandler ( bool use_v8_handler )

Definition at line 298 of file handler-outside.cc.

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◆ GetRecoveredTrapCount()

TH_EXPORT_PRIVATE size_t v8::internal::trap_handler::GetRecoveredTrapCount ( )

Definition at line 282 of file handler-outside.cc.

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◆ GetThreadInWasmThreadLocalAddress()

V8_NOINLINE TH_EXPORT_PRIVATE int * v8::internal::trap_handler::GetThreadInWasmThreadLocalAddress ( )

Definition at line 280 of file handler-outside.cc.

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◆ HandlerDataSize()

size_t v8::internal::trap_handler::HandlerDataSize ( size_t num_protected_instructions )

constexpr

Definition at line 48 of file handler-outside.cc.

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◆ HandleSignal()

void v8::internal::trap_handler::HandleSignal	(	int	signum,
		siginfo_t *	info,
		void *	context )

◆ HandleWasmTrap()

LONG WINAPI v8::internal::trap_handler::HandleWasmTrap ( EXCEPTION_POINTERS * exception )

◆ IsAccessedMemoryCovered()

bool v8::internal::trap_handler::IsAccessedMemoryCovered ( uintptr_t accessed_addr )

◆ IsFaultAddressCovered()

bool v8::internal::trap_handler::IsFaultAddressCovered ( uintptr_t fault_addr )

◆ IsThreadInWasm()

TH_DISABLE_ASAN bool v8::internal::trap_handler::IsThreadInWasm ( )

inline

Definition at line 186 of file trap-handler.h.

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◆ IsTrapHandlerEnabled()

bool v8::internal::trap_handler::IsTrapHandlerEnabled ( )

inline

Definition at line 158 of file trap-handler.h.

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◆ RegisterDefaultTrapHandler()

bool v8::internal::trap_handler::RegisterDefaultTrapHandler ( )

Definition at line 290 of file handler-outside.cc.

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◆ RegisterHandlerData()

int TH_EXPORT_PRIVATE v8::internal::trap_handler::RegisterHandlerData	(	uintptr_t	base,
		size_t	size,
		size_t	num_protected_instructions,
		const ProtectedInstructionData *	protected_instructions )

Adds the handler data to the place where the trap handler will find it.

This returns a number that can be used to identify the handler data to ReleaseHandlerData, or -1 on failure.

Definition at line 131 of file handler-outside.cc.

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◆ RegisterV8Sandbox()

bool TH_EXPORT_PRIVATE v8::internal::trap_handler::RegisterV8Sandbox	(	uintptr_t	base,
		size_t	size )

Registers the base and size of the V8 sandbox region into list of sandboxes records. If successful, these will be used by the trap handler: only faulting accesses to memory inside the V8 sandboxes should be handled by the trap handler since all Wasm memory objects are located inside the sandboxes.

Definition at line 234 of file handler-outside.cc.

◆ ReleaseHandlerData()

void TH_EXPORT_PRIVATE v8::internal::trap_handler::ReleaseHandlerData ( int index )

Removes the data from the master list and frees any memory, if necessary. TODO(mtrofin): We can switch to using size_t for index and not need kInvalidIndex.

Definition at line 207 of file handler-outside.cc.

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◆ RemoveTrapHandler()

TH_EXPORT_PRIVATE void v8::internal::trap_handler::RemoveTrapHandler ( )

Definition at line 292 of file handler-outside.cc.

◆ SetLandingPad()

TH_EXPORT_PRIVATE void v8::internal::trap_handler::SetLandingPad ( uintptr_t landing_pad )

Definition at line 318 of file handler-outside.cc.

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◆ SetThreadInWasm()

void v8::internal::trap_handler::SetThreadInWasm ( )

inline

Definition at line 188 of file trap-handler.h.

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◆ TryHandleSignal()

bool v8::internal::trap_handler::TryHandleSignal	(	int	signum,
		siginfo_t *	info,
		void *	context )

◆ TryHandleWasmTrap()

TH_DISABLE_ASAN bool v8::internal::trap_handler::TryHandleWasmTrap ( EXCEPTION_POINTERS * exception )

◆ UnregisterV8Sandbox()

void TH_EXPORT_PRIVATE v8::internal::trap_handler::UnregisterV8Sandbox	(	uintptr_t	base,
		size_t	size )

Unregisters the base and size of the V8 sandbox region decribed by base and size.

Definition at line 257 of file handler-outside.cc.

Variable Documentation

◆ g_can_enable_trap_handler

TH_EXPORT_PRIVATE std::atomic< bool > v8::internal::trap_handler::g_can_enable_trap_handler {true}

Definition at line 296 of file handler-outside.cc.

◆ g_is_trap_handler_enabled

TH_EXPORT_PRIVATE bool v8::internal::trap_handler::g_is_trap_handler_enabled {false}

Definition at line 295 of file handler-outside.cc.

◆ g_thread_in_wasm_code

thread_local int v8::internal::trap_handler::g_thread_in_wasm_code

Definition at line 29 of file handler-shared.cc.

◆ gCodeObjects

CodeProtectionInfoListEntry * v8::internal::trap_handler::gCodeObjects = nullptr

Definition at line 36 of file handler-shared.cc.

◆ gLandingPad

std::atomic< uintptr_t > v8::internal::trap_handler::gLandingPad = {0}

Definition at line 39 of file handler-shared.cc.

◆ gNumCodeObjects

size_t v8::internal::trap_handler::gNumCodeObjects = 0

Definition at line 35 of file handler-shared.cc.

◆ gRecoveredTrapCount

std::atomic_size_t v8::internal::trap_handler::gRecoveredTrapCount = {0}

Definition at line 38 of file handler-shared.cc.

◆ gSandboxRecordsHead

SandboxRecord * v8::internal::trap_handler::gSandboxRecordsHead = nullptr

Definition at line 37 of file handler-shared.cc.

◆ kCodeObjectGrowthFactor

size_t v8::internal::trap_handler::kCodeObjectGrowthFactor = 2

constexpr

Definition at line 46 of file handler-outside.cc.

◆ kInitialCodeObjectSize

size_t v8::internal::trap_handler::kInitialCodeObjectSize = 1024

constexpr

Definition at line 45 of file handler-outside.cc.

◆ kInvalidIndex

const int v8::internal::trap_handler::kInvalidIndex = -1

Definition at line 111 of file trap-handler.h.

Classes

Functions

Variables

Function Documentation

◆ AssertThreadNotInWasm()

◆ ClearThreadInWasm()

◆ CreateHandlerData()

◆ EnableTrapHandler()

◆ GetRecoveredTrapCount()

◆ GetThreadInWasmThreadLocalAddress()

◆ HandlerDataSize()

◆ HandleSignal()

◆ HandleWasmTrap()

◆ IsAccessedMemoryCovered()

◆ IsFaultAddressCovered()

◆ IsThreadInWasm()

◆ IsTrapHandlerEnabled()

◆ RegisterDefaultTrapHandler()

◆ RegisterHandlerData()

◆ RegisterV8Sandbox()

◆ ReleaseHandlerData()

◆ RemoveTrapHandler()

◆ SetLandingPad()

◆ SetThreadInWasm()

◆ TryHandleSignal()

◆ TryHandleWasmTrap()

◆ UnregisterV8Sandbox()

Variable Documentation

◆ g_can_enable_trap_handler

◆ g_is_trap_handler_enabled

◆ g_thread_in_wasm_code

◆ gCodeObjects

◆ gLandingPad

◆ gNumCodeObjects

◆ gRecoveredTrapCount

◆ gSandboxRecordsHead

◆ kCodeObjectGrowthFactor

◆ kInitialCodeObjectSize

◆ kInvalidIndex