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wasm: Implement structs stored on the stack

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By calculating the abi size of the struct, we move the stack
pointer and store each field depending on its size (i.e. a 1-byte field will use i32.store8).
This commit adds all required opcodes to perform those stores and loads.

This also gets rid of `mir_offset` as we now save results of binary operations into
locals and emit its result onto the stack within condbr instead. This makes everything a lot
simpler but also more robust.
In the future, we could look into an algorithm to re-use such locals.

For struct fields we use the new `local_with_offset` tag. This stores the struct's
stack pointer as well as the field's offset from that stack pointer.

`allocLocal` will now always allocate a single local, using a given type.
This commit is contained in:
Luuk de Gram 2021-11-18 21:33:10 +01:00
parent 261f13414b
commit b2221e5644
No known key found for this signature in database
GPG Key ID: A8CFE58E4DC7D664
3 changed files with 296 additions and 140 deletions
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298
src/arch/wasm/CodeGen.zig
View File

@ -28,16 +28,15 @@ const WValue = union(enum) {
local: u32,
/// Holds a memoized typed value
constant: TypedValue,
/// Offset position in the list of MIR instructions
mir_offset: usize,
/// Used for variables that create multiple locals on the stack when allocated
/// such as structs and optionals.
multi_value: struct {
/// The index of the first local variable
index: u32,
/// The count of local variables this `WValue` consists of.
/// i.e. an ErrorUnion has a 'count' of 2.
count: u32,
/// Used for types that contains of multiple areas within
/// a memory region in the stack.
/// The local represents the position in the stack,
/// whereas the offset represents the offset from that position.
local_with_offset: struct {
/// Index of the local variable
local: u32,
/// The offset from the local's stack position
offset: u32,
},
};
@ -187,7 +186,8 @@ fn buildOpcode(args: OpcodeBuildArguments) wasm.Opcode {
},
32 => switch (args.valtype1.?) {
.i64 => if (args.signedness.? == .signed) return .i64_load32_s else return .i64_load32_u,
.i32, .f32, .f64 => unreachable,
.i32 => return .i32_load,
.f32, .f64 => unreachable,
},
else => unreachable,
} else switch (args.valtype1.?) {
@ -668,9 +668,10 @@ fn typeToValtype(self: *Self, ty: Type) InnerError!wasm.Valtype {
.Bool,
.Pointer,
.ErrorSet,
.Struct,
.ErrorUnion,
=> wasm.Valtype.i32,
.Struct, .ErrorUnion, .Optional => unreachable, // Multi typed, must be handled individually.
else => |tag| self.fail("TODO - Wasm valtype for type '{s}'", .{tag}),
else => self.fail("TODO - Wasm valtype for type '{}'", .{ty}),
};
}
@ -692,76 +693,21 @@ fn genBlockType(self: *Self, ty: Type) InnerError!u8 {
/// Writes the bytecode depending on the given `WValue` in `val`
fn emitWValue(self: *Self, val: WValue) InnerError!void {
switch (val) {
.multi_value => unreachable, // multi_value can never be written directly, and must be accessed individually
.none, .mir_offset => {}, // no-op
.none => {}, // no-op
.local_with_offset => |with_off| try self.addLabel(.local_get, with_off.local),
.local => |idx| try self.addLabel(.local_get, idx),
.constant => |tv| try self.emitConstant(tv.val, tv.ty), // Creates a new constant on the stack
}
}
/// Creates one or multiple locals for a given `Type`.
/// Returns a corresponding `Wvalue` that can either be of tag
/// local or multi_value
/// Creates one locals for a given `Type`.
/// Returns a corresponding `Wvalue` with `local` as active tag
fn allocLocal(self: *Self, ty: Type) InnerError!WValue {
const initial_index = self.local_index;
switch (ty.zigTypeTag()) {
.Struct => {
// for each struct field, generate a local
const struct_data: *Module.Struct = ty.castTag(.@"struct").?.data;
const fields_len = @intCast(u32, struct_data.fields.count());
try self.locals.ensureUnusedCapacity(self.gpa, fields_len);
for (struct_data.fields.values()) |*value| {
const val_type = try self.genValtype(value.ty);
self.locals.appendAssumeCapacity(val_type);
self.local_index += 1;
}
return WValue{ .multi_value = .{
.index = initial_index,
.count = fields_len,
} };
},
.ErrorUnion => {
const payload_type = ty.errorUnionPayload();
const val_type = try self.genValtype(payload_type);
// we emit the error value as the first local, and the payload as the following.
// The first local is also used to find the index of the error and payload.
//
// TODO: Add support where the payload is a type that contains multiple locals such as a struct.
try self.locals.ensureUnusedCapacity(self.gpa, 2);
self.locals.appendAssumeCapacity(wasm.valtype(.i32)); // error values are always i32
self.locals.appendAssumeCapacity(val_type);
self.local_index += 2;
return WValue{ .multi_value = .{
.index = initial_index,
.count = 2,
} };
},
.Optional => {
var opt_buf: Type.Payload.ElemType = undefined;
const child_type = ty.optionalChild(&opt_buf);
if (ty.isPtrLikeOptional()) {
return self.fail("TODO: wasm optional pointer", .{});
}
try self.locals.ensureUnusedCapacity(self.gpa, 2);
self.locals.appendAssumeCapacity(wasm.valtype(.i32)); // optional 'tag' for null-checking is always i32
self.locals.appendAssumeCapacity(try self.genValtype(child_type));
self.local_index += 2;
return WValue{ .multi_value = .{
.index = initial_index,
.count = 2,
} };
},
else => {
const valtype = try self.genValtype(ty);
try self.locals.append(self.gpa, valtype);
self.local_index += 1;
return WValue{ .local = initial_index };
},
}
const valtype = try self.genValtype(ty);
try self.locals.append(self.gpa, valtype);
self.local_index += 1;
return WValue{ .local = initial_index };
}
fn genFunctype(self: *Self) InnerError!void {
@ -857,7 +803,7 @@ pub fn gen(self: *Self, ty: Type, val: Value) InnerError!Result {
if (ty.sentinel()) |sentinel| {
try self.code.appendSlice(payload.data);
switch (try self.gen(ty.elemType(), sentinel)) {
switch (try self.gen(ty.childType(), sentinel)) {
.appended => return Result.appended,
.externally_managed => |data| {
try self.code.appendSlice(data);
@ -927,15 +873,8 @@ fn restoreStackPointer(self: *Self) !void {
/// the result back into the stack pointer.
fn moveStack(self: *Self, offset: u32, local: u32) !void {
if (offset == 0) return;
// Generates the following code:
//
// global.get 0
// i32.const [offset]
// i32.sub
// global.set 0
// TODO: Rather than hardcode the stack pointer to position 0,
// have the linker resolve it.
// have the linker resolve its relocation
try self.addLabel(.global_get, 0);
try self.addImm32(@bitCast(i32, offset));
try self.addTag(.i32_sub);
@ -1053,17 +992,18 @@ fn airCall(self: *Self, inst: Air.Inst.Index) InnerError!WValue {
}
fn airAlloc(self: *Self, inst: Air.Inst.Index) InnerError!WValue {
const elem_type = self.air.typeOfIndex(inst).elemType();
const child_type = self.air.typeOfIndex(inst).childType();
// Initialize the stack
if (self.initial_stack_value == .none) {
try self.initializeStack();
}
const abi_size = elem_type.abiSize(self.target);
const abi_size = child_type.abiSize(self.target);
if (abi_size == 0) return WValue{ .none = {} };
const local = try self.allocLocal(elem_type);
// local, containing the offset to the stack position
const local = try self.allocLocal(child_type);
try self.moveStack(@intCast(u32, abi_size), local.local);
return local;
@ -1074,43 +1014,100 @@ fn airStore(self: *Self, inst: Air.Inst.Index) InnerError!WValue {
const lhs = self.resolveInst(bin_op.lhs);
const rhs = self.resolveInst(bin_op.rhs);
const ty = self.air.typeOf(bin_op.lhs).childType();
// get lhs stack position
const offset: u32 = switch (lhs) {
.local_with_offset => |with_off| with_off.offset,
else => 0,
};
switch (ty.zigTypeTag()) {
.ErrorUnion, .Optional => {
var buf: Type.Payload.ElemType = undefined;
const payload_ty = if (ty.zigTypeTag() == .ErrorUnion) ty.errorUnionPayload() else ty.optionalChild(&buf);
const tag_ty = if (ty.zigTypeTag() == .ErrorUnion) ty.errorUnionSet() else Type.initTag(.i8);
const payload_offset = @intCast(u32, tag_ty.abiSize(self.target) / 8);
if (rhs == .constant) {
// constant will contain both tag and payload,
// so save those in 2 temporary locals before storing them
// in memory
try self.emitWValue(rhs);
const tag_local = try self.allocLocal(Type.initTag(.i32));
const payload_local = try self.allocLocal(payload_ty);
try self.addLabel(.local_set, payload_local.local);
try self.addLabel(.local_set, tag_local.local);
try self.store(lhs, tag_local, tag_ty, 0);
try self.store(lhs, payload_local, payload_ty, payload_offset);
} else if (offset == 0) {
// tag is being set
try self.store(lhs, rhs, tag_ty, 0);
} else {
// payload is being set
try self.store(lhs, rhs, payload_ty, payload_offset);
}
},
else => try self.store(lhs, rhs, ty, offset),
}
return .none;
}
fn store(self: *Self, lhs: WValue, rhs: WValue, ty: Type, offset: u32) InnerError!void {
try self.emitWValue(lhs);
// get rhs value
try self.emitWValue(rhs);
const ty = self.air.typeOf(bin_op.lhs);
const valtype = try self.typeToValtype(ty);
const opcode = buildOpcode(.{
.valtype1 = valtype,
.width = @intCast(u8, Type.abiSize(ty, self.target) * 8), // use bitsize instead of byte size
.op = .store,
});
// store rhs value at stack pointer's location in memory
const mem_arg_index = try self.addExtra(Mir.MemArg{ .offset = 0, .alignment = 0 });
try self.addInst(.{ .tag = Mir.Inst.Tag.fromOpcode(opcode), .data = .{ .payload = mem_arg_index } });
return .none;
// store rhs value at stack pointer's location in memory
const mem_arg_index = try self.addExtra(Mir.MemArg{ .offset = offset, .alignment = 0 });
try self.addInst(.{ .tag = Mir.Inst.Tag.fromOpcode(opcode), .data = .{ .payload = mem_arg_index } });
}
fn airLoad(self: *Self, inst: Air.Inst.Index) InnerError!WValue {
const ty_op = self.air.instructions.items(.data)[inst].ty_op;
const lhs = self.resolveInst(ty_op.operand);
const operand = self.resolveInst(ty_op.operand);
const ty = self.air.getRefType(ty_op.ty);
return switch (ty.zigTypeTag()) {
.Struct, .ErrorUnion => operand,
else => self.load(operand, ty, 0),
};
}
fn load(self: *Self, operand: WValue, ty: Type, offset: u32) InnerError!WValue {
// load local's value from memory by its stack position
try self.emitWValue(lhs);
const mem_arg_index = try self.addExtra(Mir.MemArg{ .offset = 0, .alignment = 0 });
try self.addInst(.{ .tag = .i32_load, .data = .{ .payload = mem_arg_index } });
return .none;
try self.emitWValue(operand);
// Build the opcode with the right bitsize
const signedness: std.builtin.Signedness = if (ty.isUnsignedInt()) .unsigned else .signed;
const opcode = buildOpcode(.{
.valtype1 = try self.typeToValtype(ty),
.width = @intCast(u8, Type.abiSize(ty, self.target) * 8), // use bitsize instead of byte size
.op = .load,
.signedness = signedness,
});
const mem_arg_index = try self.addExtra(Mir.MemArg{ .offset = offset, .alignment = 0 });
try self.addInst(.{
.tag = Mir.Inst.Tag.fromOpcode(opcode),
.data = .{ .payload = mem_arg_index },
});
// store the result in a local
const result = try self.allocLocal(ty);
try self.addLabel(.local_set, result.local);
return result;
}
fn airArg(self: *Self, inst: Air.Inst.Index) InnerError!WValue {
_ = inst;
// arguments share the index with locals
defer self.local_index += 1;
return WValue{ .local = self.local_index };
defer self.arg_index += 1;
return self.args[self.arg_index];
}
fn airBinOp(self: *Self, inst: Air.Inst.Index, op: Op) InnerError!WValue {
@ -1388,14 +1385,8 @@ fn airCondBr(self: *Self, inst: Air.Inst.Index) InnerError!WValue {
// insert blocks at the position of `offset` so
// the condition can jump to it
const offset = switch (condition) {
.mir_offset => |offset| offset,
else => blk: {
const offset = self.mir_instructions.len;
try self.emitWValue(condition);
break :blk offset;
},
};
const offset = self.mir_instructions.len;
try self.emitWValue(condition);
// result type is always noreturn, so use `block_empty` as type.
try self.startBlock(.block, wasm.block_empty, offset);
@ -1415,10 +1406,6 @@ fn airCondBr(self: *Self, inst: Air.Inst.Index) InnerError!WValue {
}
fn airCmp(self: *Self, inst: Air.Inst.Index, op: std.math.CompareOperator) InnerError!WValue {
// save offset, so potential conditions can insert blocks in front of
// the comparison that we can later jump back to
const offset = self.mir_instructions.len;
const data: Air.Inst.Data = self.air.instructions.items(.data)[inst];
const lhs = self.resolveInst(data.bin_op.lhs);
const rhs = self.resolveInst(data.bin_op.rhs);
@ -1447,7 +1434,10 @@ fn airCmp(self: *Self, inst: Air.Inst.Index, op: std.math.CompareOperator) Inner
.signedness = signedness,
});
try self.addTag(Mir.Inst.Tag.fromOpcode(opcode));
return WValue{ .mir_offset = offset };
const cmp_tmp = try self.allocLocal(lhs_ty);
try self.addLabel(.local_set, cmp_tmp.local);
return cmp_tmp;
}
fn airBr(self: *Self, inst: Air.Inst.Index) InnerError!WValue {
@ -1468,7 +1458,6 @@ fn airBr(self: *Self, inst: Air.Inst.Index) InnerError!WValue {
fn airNot(self: *Self, inst: Air.Inst.Index) InnerError!WValue {
const ty_op = self.air.instructions.items(.data)[inst].ty_op;
const offset = self.mir_instructions.len;
const operand = self.resolveInst(ty_op.operand);
try self.emitWValue(operand);
@ -1478,7 +1467,10 @@ fn airNot(self: *Self, inst: Air.Inst.Index) InnerError!WValue {
try self.addImm32(0);
try self.addTag(.i32_eq);
return WValue{ .mir_offset = offset };
// save the result in the local
const not_tmp = try self.allocLocal(self.air.getRefType(ty_op.ty));
try self.addLabel(.local_set, not_tmp.local);
return not_tmp;
}
fn airBreakpoint(self: *Self, inst: Air.Inst.Index) InnerError!WValue {
@ -1504,24 +1496,45 @@ fn airStructFieldPtr(self: *Self, inst: Air.Inst.Index) InnerError!WValue {
const ty_pl = self.air.instructions.items(.data)[inst].ty_pl;
const extra = self.air.extraData(Air.StructField, ty_pl.payload);
const struct_ptr = self.resolveInst(extra.data.struct_operand);
return structFieldPtr(struct_ptr, extra.data.field_index);
const struct_ty = self.air.typeOf(extra.data.struct_operand).childType();
const offset = std.math.cast(u32, struct_ty.structFieldOffset(extra.data.field_index, self.target)) catch {
return self.fail("Field type '{}' too big to fit into stack frame", .{
struct_ty.structFieldType(extra.data.field_index),
});
};
return structFieldPtr(struct_ptr, offset);
}
fn airStructFieldPtrIndex(self: *Self, inst: Air.Inst.Index, index: u32) InnerError!WValue {
const ty_op = self.air.instructions.items(.data)[inst].ty_op;
const struct_ptr = self.resolveInst(ty_op.operand);
return structFieldPtr(struct_ptr, index);
const struct_ty = self.air.typeOf(ty_op.operand).childType();
const offset = std.math.cast(u32, struct_ty.structFieldOffset(index, self.target)) catch {
return self.fail("Field type '{}' too big to fit into stack frame", .{
struct_ty.structFieldType(index),
});
};
return structFieldPtr(struct_ptr, offset);
}
fn structFieldPtr(struct_ptr: WValue, index: u32) InnerError!WValue {
return WValue{ .local = struct_ptr.multi_value.index + index };
fn structFieldPtr(struct_ptr: WValue, offset: u32) InnerError!WValue {
return WValue{ .local_with_offset = .{ .local = struct_ptr.local, .offset = offset } };
}
fn airStructFieldVal(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.StructField, ty_pl.payload).data;
const struct_multivalue = self.resolveInst(extra.struct_operand).multi_value;
return WValue{ .local = struct_multivalue.index + extra.field_index };
const struct_field = self.air.extraData(Air.StructField, ty_pl.payload).data;
const struct_ty = self.air.typeOf(struct_field.struct_operand);
const operand = self.resolveInst(struct_field.struct_operand);
const field_index = struct_field.field_index;
const field_ty = struct_ty.structFieldType(field_index);
if (!field_ty.hasCodeGenBits()) return WValue.none;
const offset = std.math.cast(u32, struct_ty.structFieldOffset(field_index, self.target)) catch {
return self.fail("Field type '{}' too big to fit into stack frame", .{field_ty});
};
return try self.load(operand, field_ty, offset);
}
fn airSwitchBr(self: *Self, inst: Air.Inst.Index) InnerError!WValue {
@ -1675,25 +1688,32 @@ fn airSwitchBr(self: *Self, inst: Air.Inst.Index) InnerError!WValue {
fn airIsErr(self: *Self, inst: Air.Inst.Index, opcode: wasm.Opcode) InnerError!WValue {
const un_op = self.air.instructions.items(.data)[inst].un_op;
const operand = self.resolveInst(un_op);
const offset = self.mir_instructions.len;
const err_ty = self.air.typeOf(un_op).errorUnionSet();
// load the error tag value
try self.emitWValue(operand);
const mem_arg_index = try self.addExtra(Mir.MemArg{ .offset = 0, .alignment = 0 });
try self.addInst(.{
.tag = .i32_load,
.data = .{ .payload = mem_arg_index },
});
// load the error value which is positioned at multi_value's index
try self.emitWValue(.{ .local = operand.multi_value.index });
// Compare the error value with '0'
try self.addImm32(0);
try self.addTag(Mir.Inst.Tag.fromOpcode(opcode));
return WValue{ .mir_offset = offset };
const is_err_tmp = try self.allocLocal(err_ty);
try self.addLabel(.local_set, is_err_tmp.local);
return is_err_tmp;
}
fn airUnwrapErrUnionPayload(self: *Self, inst: Air.Inst.Index) InnerError!WValue {
const ty_op = self.air.instructions.items(.data)[inst].ty_op;
const operand = self.resolveInst(ty_op.operand);
// The index of multi_value contains the error code. To get the initial index of the payload we get
// the following index. Next, convert it to a `WValue.local`
//
// TODO: Check if payload is a type that requires a multi_value as well and emit that instead. i.e. a struct.
return WValue{ .local = operand.multi_value.index + 1 };
const err_ty = self.air.typeOf(ty_op.operand);
const offset = @intCast(u32, err_ty.errorUnionSet().abiSize(self.target) / 8);
return self.load(operand, self.air.getRefType(ty_op.ty), offset);
}
fn airWrapErrUnionPayload(self: *Self, inst: Air.Inst.Index) InnerError!WValue {
@ -1728,8 +1748,8 @@ fn airIsNull(self: *Self, inst: Air.Inst.Index, opcode: wasm.Opcode) InnerError!
const un_op = self.air.instructions.items(.data)[inst].un_op;
const operand = self.resolveInst(un_op);
// load the null value which is positioned at multi_value's index
try self.emitWValue(.{ .local = operand.multi_value.index });
// load the null value which is positioned at local_with_offset's index
try self.emitWValue(.{ .local = operand.local_with_offset.local });
try self.addImm32(0);
try self.addTag(Mir.Inst.Tag.fromOpcode(opcode));
@ -1743,7 +1763,7 @@ fn airIsNull(self: *Self, inst: Air.Inst.Index, opcode: wasm.Opcode) InnerError!
fn airOptionalPayload(self: *Self, inst: Air.Inst.Index) InnerError!WValue {
const ty_op = self.air.instructions.items(.data)[inst].ty_op;
const operand = self.resolveInst(ty_op.operand);
return WValue{ .local = operand.multi_value.index + 1 };
return WValue{ .local = operand.local_with_offset.local + 1 };
}
fn airOptionalPayloadPtrSet(self: *Self, inst: Air.Inst.Index) InnerError!WValue {

22
src/arch/wasm/Emit.zig
View File

@ -60,8 +60,30 @@ pub fn emitMir(emit: *Emit) InnerError!void {
// memory instructions
.i32_load => try emit.emitMemArg(tag, inst),
.i64_load => try emit.emitMemArg(tag, inst),
.f32_load => try emit.emitMemArg(tag, inst),
.f64_load => try emit.emitMemArg(tag, inst),
.i32_load8_s => try emit.emitMemArg(tag, inst),
.i32_load8_u => try emit.emitMemArg(tag, inst),
.i32_load16_s => try emit.emitMemArg(tag, inst),
.i32_load16_u => try emit.emitMemArg(tag, inst),
.i64_load8_s => try emit.emitMemArg(tag, inst),
.i64_load8_u => try emit.emitMemArg(tag, inst),
.i64_load16_s => try emit.emitMemArg(tag, inst),
.i64_load16_u => try emit.emitMemArg(tag, inst),
.i64_load32_s => try emit.emitMemArg(tag, inst),
.i64_load32_u => try emit.emitMemArg(tag, inst),
.i32_store => try emit.emitMemArg(tag, inst),
.i64_store => try emit.emitMemArg(tag, inst),
.f32_store => try emit.emitMemArg(tag, inst),
.f64_store => try emit.emitMemArg(tag, inst),
.i32_store8 => try emit.emitMemArg(tag, inst),
.i32_store16 => try emit.emitMemArg(tag, inst),
.i64_store8 => try emit.emitMemArg(tag, inst),
.i64_store16 => try emit.emitMemArg(tag, inst),
.i64_store32 => try emit.emitMemArg(tag, inst),
// Instructions with an index that do not require relocations
.local_get => try emit.emitLabel(tag, inst),
.local_set => try emit.emitLabel(tag, inst),
.local_tee => try emit.emitLabel(tag, inst),

116
src/arch/wasm/Mir.zig
View File

@ -97,11 +97,125 @@ pub const Inst = struct {
///
/// Uses `payload` of type `MemArg`.
i32_load = 0x28,
/// Loads a value from memory onto the stack, based on the signedness
/// and bitsize of the type.
///
/// Uses `payload` with type `MemArg`
i64_load = 0x29,
/// Loads a value from memory onto the stack, based on the signedness
/// and bitsize of the type.
///
/// Uses `payload` with type `MemArg`
f32_load = 0x2A,
/// Loads a value from memory onto the stack, based on the signedness
/// and bitsize of the type.
///
/// Uses `payload` with type `MemArg`
f64_load = 0x2B,
/// Loads a value from memory onto the stack, based on the signedness
/// and bitsize of the type.
///
/// Uses `payload` with type `MemArg`
i32_load8_s = 0x2C,
/// Loads a value from memory onto the stack, based on the signedness
/// and bitsize of the type.
///
/// Uses `payload` with type `MemArg`
i32_load8_u = 0x2D,
/// Loads a value from memory onto the stack, based on the signedness
/// and bitsize of the type.
///
/// Uses `payload` with type `MemArg`
i32_load16_s = 0x2E,
/// Loads a value from memory onto the stack, based on the signedness
/// and bitsize of the type.
///
/// Uses `payload` with type `MemArg`
i32_load16_u = 0x2F,
/// Loads a value from memory onto the stack, based on the signedness
/// and bitsize of the type.
///
/// Uses `payload` with type `MemArg`
i64_load8_s = 0x30,
/// Loads a value from memory onto the stack, based on the signedness
/// and bitsize of the type.
///
/// Uses `payload` with type `MemArg`
i64_load8_u = 0x31,
/// Loads a value from memory onto the stack, based on the signedness
/// and bitsize of the type.
///
/// Uses `payload` with type `MemArg`
i64_load16_s = 0x32,
/// Loads a value from memory onto the stack, based on the signedness
/// and bitsize of the type.
///
/// Uses `payload` with type `MemArg`
i64_load16_u = 0x33,
/// Loads a value from memory onto the stack, based on the signedness
/// and bitsize of the type.
///
/// Uses `payload` with type `MemArg`
i64_load32_s = 0x34,
/// Loads a value from memory onto the stack, based on the signedness
/// and bitsize of the type.
///
/// Uses `payload` with type `MemArg`
i64_load32_u = 0x35,
/// Pops 2 values from the stack, where the first value represents the value to write into memory
/// and the second value represents the offset into memory where the value must be written to.
/// This opcode is typed and expects the stack value's type to be equal to this opcode's type.
///
/// Uses `payload` of type `MemArg`.
i32_store = 0x36,
/// Pops 2 values from the stack, where the first value represents the value to write into memory
/// and the second value represents the offset into memory where the value must be written to.
/// This opcode is typed and expects the stack value's type to be equal to this opcode's type.
///
/// Uses `Payload` with type `MemArg`
i64_store = 0x37,
/// Pops 2 values from the stack, where the first value represents the value to write into memory
/// and the second value represents the offset into memory where the value must be written to.
/// This opcode is typed and expects the stack value's type to be equal to this opcode's type.
///
/// Uses `Payload` with type `MemArg`
f32_store = 0x38,
/// Pops 2 values from the stack, where the first value represents the value to write into memory
/// and the second value represents the offset into memory where the value must be written to.
/// This opcode is typed and expects the stack value's type to be equal to this opcode's type.
///
/// Uses `Payload` with type `MemArg`
f64_store = 0x39,
/// Pops 2 values from the stack, where the first value represents the value to write into memory
/// and the second value represents the offset into memory where the value must be written to.
/// This opcode is typed and expects the stack value's type to be equal to this opcode's type.
///
/// Uses `Payload` with type `MemArg`
i32_store8 = 0x3A,
/// Pops 2 values from the stack, where the first value represents the value to write into memory
/// and the second value represents the offset into memory where the value must be written to.
/// This opcode is typed and expects the stack value's type to be equal to this opcode's type.
///
/// Uses `Payload` with type `MemArg`
i32_store16 = 0x3B,
/// Pops 2 values from the stack, where the first value represents the value to write into memory
/// and the second value represents the offset into memory where the value must be written to.
/// This opcode is typed and expects the stack value's type to be equal to this opcode's type.
///
/// Uses `Payload` with type `MemArg`
i64_store8 = 0x3C,
/// Pops 2 values from the stack, where the first value represents the value to write into memory
/// and the second value represents the offset into memory where the value must be written to.
/// This opcode is typed and expects the stack value's type to be equal to this opcode's type.
///
/// Uses `Payload` with type `MemArg`
i64_store16 = 0x3D,
/// Pops 2 values from the stack, where the first value represents the value to write into memory
/// and the second value represents the offset into memory where the value must be written to.
/// This opcode is typed and expects the stack value's type to be equal to this opcode's type.
///
/// Uses `Payload` with type `MemArg`
i64_store32 = 0x3E,
/// Returns the memory size in amount of pages.
///
/// Uses `nop`
@ -247,7 +361,7 @@ pub const Inst = struct {
/// From a given wasm opcode, returns a MIR tag.
pub fn fromOpcode(opcode: std.wasm.Opcode) Tag {
return @intToEnum(Tag, @enumToInt(opcode));
return @intToEnum(Tag, @enumToInt(opcode)); // Given `Opcode` is not present as a tag for MIR yet
}
/// Returns a wasm opcode from a given MIR tag.