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stack.h
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49 lines (38 loc) · 1.73 KB
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/*
* Copyright 2020 The Emscripten Authors. All rights reserved.
* Emscripten is available under two separate licenses, the MIT license and the
* University of Illinois/NCSA Open Source License. Both these licenses can be
* found in the LICENSE file.
*/
#pragma once
#include <inttypes.h>
#include <stddef.h>
// API that gives access to introspecting the Wasm data stack.
#ifdef __cplusplus
extern "C" {
#endif
// Returns the starting address of the stack. This is the address
// that the stack pointer would point to when no bytes are in use on the stack.
uintptr_t emscripten_stack_get_base(void);
// Returns the end address of the stack. This is the address that the stack
// pointer would point to when the whole stack is in use. (the address pointed
// to by the end is not part of the stack itself). Note that the stack grows
// down so the address returned by emscripten_stack_get_end() is smaller than
// emscripten_stack_get_base().
uintptr_t emscripten_stack_get_end(void);
// Setup internal base/end values based on the initial values that were either
// set at compile time (in static linking) or instantiation time (for dynamic
// linking).
void emscripten_stack_init(void);
// Sets the internal values reported by emscripten_stack_get_base() and
// emscripten_stack_get_end(). This should be only used by low level libraries
// such as asyncify fibers.
void emscripten_stack_set_limits(void* base __attribute__((nonnull)), void* end __attribute__((nonnull)));
// Returns the current stack pointer.
uintptr_t emscripten_stack_get_current(void);
// Returns the number of free bytes left on the stack. This is required to be
// fast so that it can be called frequently.
size_t emscripten_stack_get_free(void);
#ifdef __cplusplus
}
#endif