diff options
| author | Rett Berg <rett@google.com> | 2019-11-16 12:47:32 -0700 |
|---|---|---|
| committer | Rett Berg <rett@google.com> | 2019-11-16 12:47:32 -0700 |
| commit | 0427cb31681114e3d4c2bf664c37d17aa82a7f59 (patch) | |
| tree | 8426bef2b711880428900acbb4c122b77555cde5 /wasm.html.markdown | |
| parent | 4727925b1aef7f030adb8ae76bf7562a6280b54e (diff) | |
more comment updates
Diffstat (limited to 'wasm.html.markdown')
| -rw-r--r-- | wasm.html.markdown | 12 |
1 files changed, 6 insertions, 6 deletions
diff --git a/wasm.html.markdown b/wasm.html.markdown index d62539b8..aba2084f 100644 --- a/wasm.html.markdown +++ b/wasm.html.markdown @@ -224,9 +224,9 @@ contributors: (export "apply_cos64" (func $apply_cos64)) ;; Wasm is a stack-based language, but for returning values more complicated - ;; than an int/float, a memory stack has to be manually managed. One + ;; than an int/float, a separate memory stack has to be manually managed. One ;; approach is to use a mutable global to store the stack_ptr. We give - ;; ourselves 1MiB of mem-stack and grow it downwards. + ;; ourselves 1MiB of memstack and grow it downwards. ;; ;; Below is a demonstration of how this C code **might** be written by hand ;; @@ -244,7 +244,7 @@ contributors: ;; return s.a + s.b; ;; } - ;; Unlike C, we must manage our own memory stack + ;; Unlike C, we must manage our own memory stack. We reserve 1MiB (global $memstack_ptr (mut i32) (i32.const 65536)) ;; Structs can only be returned by reference @@ -270,7 +270,7 @@ contributors: (local $var$sum_struct$b i32) (local $local_memstack_ptr i32) - ;; reserve stack space + ;; reserve memstack space (i32.sub (get_global $memstack_ptr) (i32.const 8) @@ -278,7 +278,7 @@ contributors: tee_local $local_memstack_ptr ;; tee both stores and returns given value set_global $memstack_ptr - ;; call the function, storing the result in the stack + ;; call the function, storing the result in the memstack (call $sum_struct_create ((;$sum_struct_ptr=;) get_local $local_memstack_ptr) ((;$var$a=;) i32.const 40) @@ -293,7 +293,7 @@ contributors: (i32.load offset=4 (get_local $local_memstack_ptr)) ) - ;; unreserve stack space + ;; unreserve memstack space (set_global $memstack_ptr (i32.add (get_local $local_memstack_ptr) |