A WasmContext holds associated information of a WebAssembly module instance. More...

#include <WebAssembly.hpp>

Collaboration diagram for m::WasmEngine::WasmContext:

Public Types
enum	config_t : uint64_t { TRAP_GUARD_PAGES = 0b1 }

Public Member Functions
	WasmContext (uint32_t id, const MatchBase &plan, config_t configuration, std::size_t size)

bool	config (config_t cfg) const

uint32_t	map_table (const Table &table)
	Maps a table at the current start of `heap` and advances `heap` past the mapped region.

void	install_guard_page ()
	Installs a guard page at the current `heap` and increments `heap` to the next page.

std::size_t	add_index (const idx::IndexBase &index)
	Adds an index to the `WasmContext` and returns its position in the vector as id.

Data Fields
unsigned	id
	a unique ID

const MatchBase &	plan
	current plan

std::unique_ptr< const storage::DataLayoutFactory >	result_set_factory
	‍factory used to create the result set data layout

memory::AddressSpace	vm
	WebAssembly module instance's virtual address space aka. linear memory

uint32_t	heap = 0
	beginning of the heap, encoded as offset from the beginning of the virtual address space

std::vector< std::reference_wrapper< const idx::IndexBase > >	indexes
	the indexes used in the query

Private Attributes
config_t	config_

Detailed Description

A WasmContext holds associated information of a WebAssembly module instance.

Definition at line 26 of file WebAssembly.hpp.

Member Enumeration Documentation

◆ config_t

enum m::WasmEngine::WasmContext::config_t : uint64_t

Enumerator
TRAP_GUARD_PAGES	map guard pages with PROT_NONE to trap any accesses

Definition at line 28 of file WebAssembly.hpp.

Constructor & Destructor Documentation

◆ WasmContext()

M_LCOV_EXCL_STOP WasmEngine::WasmContext::WasmContext	(	uint32_t	id,
		const MatchBase &	plan,
		config_t	configuration,
		std::size_t	size
	)

Definition at line 56 of file WebAssembly.cpp.

References install_guard_page(), M_insist, and m::WasmEngine::WASM_MAX_MEMORY.

Member Function Documentation

◆ add_index()

std::size_t m::WasmEngine::WasmContext::add_index ( const idx::IndexBase & index )

inline

Adds an index to the WasmContext and returns its position in the vector as id.

Definition at line 59 of file WebAssembly.hpp.

References indexes.

◆ config()

bool m::WasmEngine::WasmContext::config ( config_t cfg ) const

inline

Definition at line 47 of file WebAssembly.hpp.

References config_.

◆ install_guard_page()

void WasmEngine::WasmContext::install_guard_page ( )

Installs a guard page at the current heap and increments heap to the next page.

Acknowledges TRAP_GUARD_PAGES.

Definition at line 90 of file WebAssembly.cpp.

References m::get_pagesize(), m::Is_Page_Aligned(), M_DISCARD, and M_insist.

Referenced by WasmContext().

◆ map_table()

uint32_t WasmEngine::WasmContext::map_table ( const Table & table )

Maps a table at the current start of heap and advances heap past the mapped region.

Returns the address (in linear memory) of the mapped table. Installs guard pages after each mapping. Acknowledges TRAP_GUARD_PAGES.

Definition at line 67 of file WebAssembly.cpp.

References m::Ceil_To_Next_Page(), m::storage::DataLayout::child(), m::Is_Page_Aligned(), m::Table::layout(), M_insist, m::memory::Memory::map(), m::Store::memory(), m::Store::num_rows(), m::storage::DataLayout::Node::num_tuples(), m::Table::store(), and m::storage::DataLayout::stride_in_bits().

Field Documentation

◆ config_

config_t m::WasmEngine::WasmContext::config_

private

Definition at line 34 of file WebAssembly.hpp.

Referenced by config().

◆ heap

uint32_t m::WasmEngine::WasmContext::heap = 0

beginning of the heap, encoded as offset from the beginning of the virtual address space

Definition at line 42 of file WebAssembly.hpp.

◆ id

unsigned m::WasmEngine::WasmContext::id

a unique ID

Definition at line 37 of file WebAssembly.hpp.

Referenced by m::wasm::detail::create_js_debug_script(), and m::WasmEngine::Dispose_Wasm_Context().

◆ indexes

std::vector<std::reference_wrapper<const idx::IndexBase> > m::WasmEngine::WasmContext::indexes

the indexes used in the query

Definition at line 43 of file WebAssembly.hpp.

Referenced by add_index().

◆ plan

const MatchBase& m::WasmEngine::WasmContext::plan

current plan

Definition at line 38 of file WebAssembly.hpp.

◆ result_set_factory

std::unique_ptr<const storage::DataLayoutFactory> m::WasmEngine::WasmContext::result_set_factory

‍factory used to create the result set data layout

Definition at line 40 of file WebAssembly.hpp.

◆ vm

memory::AddressSpace m::WasmEngine::WasmContext::vm

WebAssembly module instance's virtual address space aka. linear memory

Definition at line 41 of file WebAssembly.hpp.

Referenced by m::wasm::Module::Memory().

The documentation for this struct was generated from the following files:

include/mutable/backend/WebAssembly.hpp
src/backend/WebAssembly.cpp

Public Types

Public Member Functions

Data Fields

Private Attributes