| .globl stackSave |
| .globl stackRestore |
| .globl stackAlloc |
| .globl emscripten_stack_get_current |
| |
| #ifdef __wasm64__ |
| #define PTR i64 |
| #define MASK 0xfffffffffffffff0 |
| #else |
| #define PTR i32 |
| #define MASK 0xfffffff0 |
| #endif |
| |
| .globaltype __stack_pointer, PTR |
| |
| stackSave: |
| .functype stackSave() -> (PTR) |
| global.get __stack_pointer |
| end_function |
| |
| stackRestore: |
| .functype stackRestore(PTR) -> () |
| local.get 0 |
| global.set __stack_pointer |
| end_function |
| |
| stackAlloc: |
| .functype stackAlloc(PTR) -> (PTR) |
| .local PTR, PTR |
| global.get __stack_pointer |
| # Get arg 0 -> number of bytes to allocate |
| local.get 0 |
| # Stack grows down. Subtract arg0 from __stack_pointer |
| PTR.sub |
| # Align result by anding with ~15 |
| PTR.const MASK |
| PTR.and |
| local.tee 1 |
| global.set __stack_pointer |
| local.get 1 |
| end_function |
| |
| emscripten_stack_get_current: |
| .functype emscripten_stack_get_current () -> (PTR) |
| global.get __stack_pointer |
| end_function |
| |
