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Remove unnecessary Option

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This commit is contained in:
Brian Carroll 2021-09-18 14:46:09 +01:00
parent c3b5ac6c82
commit 65446ce1e8
3 changed files with 36 additions and 43 deletions
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38
compiler/gen_wasm/src/lib.rs
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@ -23,6 +23,7 @@ pub const ALIGN_4: u32 = 2;
pub const ALIGN_8: u32 = 3;
pub const STACK_POINTER_GLOBAL_ID: u32 = 0;
pub const STACK_ALIGNMENT_BYTES: i32 = 16;
#[derive(Clone, Copy, Debug)]
pub struct LocalId(pub u32);
@ -156,38 +157,27 @@ fn copy_memory(
pub fn allocate_stack_frame(
instructions: &mut Vec<Instruction>,
size: i32,
local_frame_pointer: Option<LocalId>,
local_frame_pointer: LocalId,
) {
if size == 0 {
return;
}
instructions.push(GetGlobal(STACK_POINTER_GLOBAL_ID));
instructions.push(I32Const(size));
instructions.push(I32Sub);
if let Some(LocalId(local_index)) = local_frame_pointer {
instructions.push(TeeLocal(local_index));
}
instructions.push(SetGlobal(STACK_POINTER_GLOBAL_ID));
let aligned_size = (size + STACK_ALIGNMENT_BYTES - 1) & (-STACK_ALIGNMENT_BYTES);
instructions.extend([
GetGlobal(STACK_POINTER_GLOBAL_ID),
I32Const(aligned_size),
I32Sub,
TeeLocal(local_frame_pointer.0),
SetGlobal(STACK_POINTER_GLOBAL_ID),
]);
}
pub fn free_stack_frame(
instructions: &mut Vec<Instruction>,
size: i32,
local_frame_pointer: Option<LocalId>,
local_frame_pointer: LocalId,
) {
if size == 0 {
return;
}
let get_stack_frame =
if let Some(LocalId(local_index)) = local_frame_pointer {
GetLocal(local_index)
} else {
GetGlobal(STACK_POINTER_GLOBAL_ID)
};
let aligned_size = (size + STACK_ALIGNMENT_BYTES - 1) & (-STACK_ALIGNMENT_BYTES);
instructions.extend([
get_stack_frame,
I32Const(size),
GetLocal(local_frame_pointer.0),
I32Const(aligned_size),
I32Add,
SetGlobal(STACK_POINTER_GLOBAL_ID),
]);