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wasm: Implement field_parent_ptr

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This commit is contained in:
Luuk de Gram 2022-03-08 22:13:47 +01:00 committed by Andrew Kelley
parent f931c0638d
commit 3ea113e008
1 changed files with 36 additions and 12 deletions
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48
src/arch/wasm/CodeGen.zig
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@ -1157,22 +1157,24 @@ fn isByRef(ty: Type, target: std.Target) bool {
/// local value to store the pointer. This allows for local re-use and improves binary size.
fn buildPointerOffset(self: *Self, ptr_value: WValue, offset: u64, action: enum { modify, new }) InnerError!WValue {
// do not perform arithmetic when offset is 0.
if (offset == 0 and ptr_value.offset() == 0) return ptr_value;
if (offset == 0 and ptr_value.offset() == 0 and action == .modify) return ptr_value;
const result_ptr: WValue = switch (action) {
.new => try self.allocLocal(Type.usize),
.modify => ptr_value,
};
try self.emitWValue(ptr_value);
switch (self.arch()) {
.wasm32 => {
try self.addImm32(@bitCast(i32, @intCast(u32, offset + ptr_value.offset())));
try self.addTag(.i32_add);
},
.wasm64 => {
try self.addImm64(offset + ptr_value.offset());
try self.addTag(.i64_add);
},
else => unreachable,
if (offset + ptr_value.offset() > 0) {
switch (self.arch()) {
.wasm32 => {
try self.addImm32(@bitCast(i32, @intCast(u32, offset + ptr_value.offset())));
try self.addTag(.i32_add);
},
.wasm64 => {
try self.addImm64(offset + ptr_value.offset());
try self.addTag(.i64_add);
},
else => unreachable,
}
}
try self.addLabel(.local_set, result_ptr.local);
return result_ptr;
@ -1267,6 +1269,7 @@ fn genInst(self: *Self, inst: Air.Inst.Index) !WValue {
.struct_field_ptr_index_2 => self.airStructFieldPtrIndex(inst, 2),
.struct_field_ptr_index_3 => self.airStructFieldPtrIndex(inst, 3),
.struct_field_val => self.airStructFieldVal(inst),
.field_parent_ptr => self.airFieldParentPtr(inst),
.switch_br => self.airSwitchBr(inst),
.trunc => self.airTrunc(inst),
@ -1334,7 +1337,6 @@ fn genInst(self: *Self, inst: Air.Inst.Index) !WValue {
.atomic_rmw,
.tag_name,
.error_name,
.field_parent_ptr,
.mul_add,
// For these 4, probably best to wait until https://github.com/ziglang/zig/issues/10248
@ -3252,3 +3254,25 @@ fn airErrUnionPayloadPtrSet(self: *Self, inst: Air.Inst.Index) InnerError!WValue
return self.buildPointerOffset(operand, @intCast(u32, offset), .new);
}
fn airFieldParentPtr(self: *Self, inst: Air.Inst.Index) InnerError!WValue {
if (self.liveness.isUnused(inst)) return WValue{ .none = {} };
const ty_pl = self.air.instructions.items(.data)[inst].ty_pl;
const extra = self.air.extraData(Air.FieldParentPtr, ty_pl.payload).data;
const field_ptr = try self.resolveInst(extra.field_ptr);
const struct_ty = self.air.getRefType(ty_pl.ty).childType();
const field_offset = struct_ty.structFieldOffset(extra.field_index, self.target);
if (field_offset == 0) {
return field_ptr;
}
const base = try self.buildPointerOffset(field_ptr, 0, .new);
try self.addLabel(.local_get, base.local);
try self.addImm32(@bitCast(i32, @intCast(u32, field_offset)));
try self.addTag(.i32_sub);
try self.addLabel(.local_set, base.local);
return base;
}