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The functions defined in <emscripten/stack.h> allow inspecting information about the WebAssembly data stack (sometimes called the “user stack” or the “C stack”). This data stack is the data contained within the linear memory (as opposed to the trusted call stack that is managed by the VM, and which is not visible to the running program).
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.
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_set_limits(void* base, void* end)¶
Sets the internal values reported by
emscripten_stack_get_end(). This should only be used by low
level libraries such as asyncify fibers.
Returns the current stack pointer.
Returns the number of free bytes left on the stack. This is required to be fast so that it can be called frequently.