/************************************************************/ /**
*
*	@file: runtime_memory.c
*	@author: Martin Fouilleul
*	@date: 17/04/2023
*
*****************************************************************/

#include "runtime.h"

void* wasm_memory_resize_callback(void* p, unsigned long size, void* userData)
{
    wasm_memory* memory = (wasm_memory*)userData;

    if(memory->committed >= size)
    {
        return (memory->ptr);
    }
    else if(memory->committed < memory->reserved)
    {
        u32 commitSize = size - memory->committed;

        oc_base_allocator* allocator = oc_base_allocator_default();
        oc_base_commit(allocator, memory->ptr + memory->committed, commitSize);
        memory->committed += commitSize;
        return (memory->ptr);
    }
    else
    {
        OC_ABORT("Out of memory");
        return (0);
    }
}

void wasm_memory_free_callback(void* p, void* userData)
{
    wasm_memory* memory = (wasm_memory*)userData;

    oc_base_allocator* allocator = oc_base_allocator_default();
    oc_base_release(allocator, memory->ptr, memory->reserved);
    memset(memory, 0, sizeof(wasm_memory));
}

extern u32 oc_mem_grow(u64 size)
{
    oc_runtime_env* runtime = oc_runtime_env_get();
    wasm_memory* memory = &runtime->wasmMemory;

    size = oc_align_up_pow2(size, d_m3MemPageSize);
    u64 totalSize = size + m3_GetMemorySize(runtime->m3Runtime);

    u32 addr = memory->committed;

    //NOTE: call resize memory, which will call our custom resize callback... this is a bit involved because
    //      wasm3 doesn't allow resizing the memory directly
    M3Result res = ResizeMemory(runtime->m3Runtime, totalSize / d_m3MemPageSize);

    return (addr);
}

void* wasm_memory_offset_to_ptr(wasm_memory* memory, u32 offset)
{
    M3MemoryHeader* header = (M3MemoryHeader*)(memory->ptr);
    OC_DEBUG_ASSERT(offset < header->length, "Wasm offset exceeds memory length");
    return memory->ptr + sizeof(M3MemoryHeader) + offset;
}