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Get rid of VM stack storage

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This commit is contained in:
Brian Carroll 2023-10-28 12:12:36 +01:00
parent 8afb88f5a4
commit 5719384ed9
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GPG key ID: 5C7B2EC4101703C0
6 changed files with 67 additions and 252 deletions
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151
crates/compiler/gen_wasm/src/backend.rs
View file

@ -89,8 +89,8 @@ impl<'a, 'r> WasmBackend<'a, 'r> {
fn_index_offset: u32,
helper_proc_gen: CodeGenHelp<'a>,
) -> Self {
let can_relocate_heap = module.linking.find_internal_symbol("__heap_base").is_ok()
&& module.linking.find_internal_symbol("__heap_end").is_ok();
let has_heap_base = module.linking.find_internal_symbol("__heap_base").is_ok();
let has_heap_end = module.linking.find_internal_symbol("__heap_end").is_ok();
// We don't want to import any Memory or Tables
module.import.imports.retain(|import| {
@ -135,7 +135,7 @@ impl<'a, 'r> WasmBackend<'a, 'r> {
proc_lookup,
host_lookup,
helper_proc_gen,
can_relocate_heap,
can_relocate_heap: has_heap_base && has_heap_end,
// Function-level data
block_depth: 0,
@ -795,21 +795,17 @@ impl<'a, 'r> WasmBackend<'a, 'r> {
self.expr(sym, expr, layout, &sym_storage);
// If this value is stored in the VM stack, we need code_builder to track it
// (since every instruction can change the VM stack)
if let Some(StoredValue::VirtualMachineStack { vm_state, .. }) =
self.storage.symbol_storage_map.get_mut(&sym)
{
*vm_state = self.code_builder.set_top_symbol(sym);
if let StoredValue::Local { local_id, .. } = sym_storage {
if !self.code_builder.stack_is_empty() {
self.code_builder.set_local(local_id);
}
}
}
fn stmt_ret(&mut self, sym: Symbol) {
use crate::storage::StoredValue::*;
let storage = self.storage.symbol_storage_map.get(&sym).unwrap();
match storage {
match self.storage.get(&sym) {
StackMemory {
location,
size,
@ -856,12 +852,6 @@ impl<'a, 'r> WasmBackend<'a, 'r> {
// We may be able to improve this in the future with `Select`
// or `BrTable`
// Ensure the condition value is not stored only in the VM stack
// Otherwise we can't reach it from inside the block
let cond_storage = self.storage.get(&cond_symbol).to_owned();
self.storage
.ensure_value_has_local(&mut self.code_builder, cond_symbol, cond_storage);
// create a block for each branch except the default
for _ in 0..branches.len() {
self.start_block()
@ -929,17 +919,12 @@ impl<'a, 'r> WasmBackend<'a, 'r> {
// make locals for join pointer parameters
let mut jp_param_storages = Vec::with_capacity_in(parameters.len(), self.env.arena);
for parameter in parameters.iter() {
let mut param_storage = self.storage.allocate_var(
let param_storage = self.storage.allocate_var(
self.layout_interner,
parameter.layout,
parameter.symbol,
StoredVarKind::Variable,
);
param_storage = self.storage.ensure_value_has_local(
&mut self.code_builder,
parameter.symbol,
param_storage,
);
jp_param_storages.push(param_storage);
}
@ -964,12 +949,8 @@ impl<'a, 'r> WasmBackend<'a, 'r> {
for (arg_symbol, param_storage) in arguments.iter().zip(param_storages.iter()) {
let arg_storage = self.storage.get(arg_symbol).clone();
self.storage.clone_value(
&mut self.code_builder,
param_storage,
&arg_storage,
*arg_symbol,
);
self.storage
.clone_value(&mut self.code_builder, param_storage, &arg_storage);
}
// jump
@ -1018,17 +999,11 @@ impl<'a, 'r> WasmBackend<'a, 'r> {
// Get pointer and offset
let value_storage = self.storage.get(&value).to_owned();
let stored_with_local =
self.storage
.ensure_value_has_local(&mut self.code_builder, value, value_storage);
let (tag_local_id, tag_offset) = match stored_with_local {
let (tag_local_id, tag_offset) = match value_storage {
StoredValue::StackMemory { location, .. } => {
location.local_and_offset(self.storage.stack_frame_pointer)
}
StoredValue::Local { local_id, .. } => (local_id, 0),
StoredValue::VirtualMachineStack { .. } => {
internal_error!("{:?} should have a local variable", value)
}
};
// load pointer, and add the offset to the pointer
@ -1117,13 +1092,13 @@ impl<'a, 'r> WasmBackend<'a, 'r> {
reuse,
} => {
let reuse = reuse.map(|ru| ru.symbol);
self.expr_tag(union_layout, *tag_id, arguments, sym, storage, reuse)
self.expr_tag(union_layout, *tag_id, arguments, storage, reuse)
}
Expr::GetTagId {
structure,
union_layout,
} => self.expr_get_tag_id(*structure, union_layout, sym, storage),
} => self.expr_get_tag_id(*structure, union_layout, storage),
Expr::UnionAtIndex {
structure,
@ -1142,7 +1117,6 @@ impl<'a, 'r> WasmBackend<'a, 'r> {
*tag_id,
union_layout,
*index,
sym,
storage,
),
@ -1157,7 +1131,7 @@ impl<'a, 'r> WasmBackend<'a, 'r> {
Expr::Alloca {
initializer,
element_layout,
} => self.expr_alloca(*initializer, *element_layout, sym, storage),
} => self.expr_alloca(*initializer, *element_layout, storage),
Expr::RuntimeErrorFunction(_) => {
todo!("Expression `{}`", expr.to_pretty(100, false))
@ -1179,7 +1153,7 @@ impl<'a, 'r> WasmBackend<'a, 'r> {
};
match storage {
StoredValue::VirtualMachineStack { value_type, .. } => {
StoredValue::Local { value_type, .. } => {
match (lit, value_type) {
(Literal::Float(x), ValueType::F64) => self.code_builder.f64_const(*x),
(Literal::Float(x), ValueType::F32) => self.code_builder.f32_const(*x as f32),
@ -1233,8 +1207,6 @@ impl<'a, 'r> WasmBackend<'a, 'r> {
Literal::Bool(_) | Literal::Byte(_) => invalid_error(),
}
}
_ => invalid_error(),
};
}
@ -1540,12 +1512,8 @@ impl<'a, 'r> WasmBackend<'a, 'r> {
if !fields.is_empty() {
// Struct expression but not Struct layout => single element. Copy it.
let field_storage = self.storage.get(&fields[0]).to_owned();
self.storage.clone_value(
&mut self.code_builder,
storage,
&field_storage,
fields[0],
);
self.storage
.clone_value(&mut self.code_builder, storage, &field_storage);
} else {
// Empty record. Nothing to do.
}
@ -1575,12 +1543,6 @@ impl<'a, 'r> WasmBackend<'a, 'r> {
debug_assert!(matches!(value_type, ValueType::I32));
(AddressValue::NotLoaded(*local_id), 0)
}
StoredValue::VirtualMachineStack { .. } => {
self.storage
.load_symbols(&mut self.code_builder, &[structure]);
(AddressValue::Loaded, 0)
}
};
for field in field_layouts.iter().take(index as usize) {
offset += self.layout_interner.stack_size(*field);
@ -1691,7 +1653,6 @@ impl<'a, 'r> WasmBackend<'a, 'r> {
union_layout: &UnionLayout<'a>,
tag_id: TagIdIntType,
arguments: &'a [Symbol],
symbol: Symbol,
stored: &StoredValue,
maybe_reused: Option<Symbol>,
) {
@ -1705,12 +1666,7 @@ impl<'a, 'r> WasmBackend<'a, 'r> {
let (data_size, data_alignment) =
union_layout.data_size_and_alignment(self.layout_interner);
// We're going to use the pointer many times, so put it in a local variable
let stored_with_local =
self.storage
.ensure_value_has_local(&mut self.code_builder, symbol, stored.to_owned());
let (local_id, data_offset) = match stored_with_local {
let (local_id, data_offset) = match stored {
StoredValue::StackMemory { location, .. } => {
location.local_and_offset(self.storage.stack_frame_pointer)
}
@ -1722,23 +1678,20 @@ impl<'a, 'r> WasmBackend<'a, 'r> {
self.code_builder.if_();
{
self.storage.load_symbols(&mut self.code_builder, &[reused]);
self.code_builder.set_local(local_id);
self.code_builder.set_local(*local_id);
}
self.code_builder.else_();
{
self.allocate_with_refcount(Some(data_size), data_alignment, 1);
self.code_builder.set_local(local_id);
self.code_builder.set_local(*local_id);
}
self.code_builder.end();
} else {
// Call the allocator to get a memory address.
self.allocate_with_refcount(Some(data_size), data_alignment, 1);
self.code_builder.set_local(local_id);
self.code_builder.set_local(*local_id);
}
(local_id, 0)
}
StoredValue::VirtualMachineStack { .. } => {
internal_error!("{:?} should have a local variable", symbol)
(*local_id, 0)
}
};
@ -1792,7 +1745,6 @@ impl<'a, 'r> WasmBackend<'a, 'r> {
&mut self,
structure: Symbol,
union_layout: &UnionLayout<'a>,
tag_id_symbol: Symbol,
stored_value: &StoredValue,
) {
use UnionLayout::*;
@ -1805,13 +1757,8 @@ impl<'a, 'r> WasmBackend<'a, 'r> {
return;
}
NullableWrapped { nullable_id, .. } => {
let stored_with_local = self.storage.ensure_value_has_local(
&mut self.code_builder,
tag_id_symbol,
stored_value.to_owned(),
);
let local_id = match stored_with_local {
StoredValue::Local { local_id, .. } => local_id,
let local_id = match stored_value {
StoredValue::Local { local_id, .. } => *local_id,
_ => internal_error!("ensure_value_has_local didn't work"),
};
@ -1903,19 +1850,11 @@ impl<'a, 'r> WasmBackend<'a, 'r> {
// Get pointer and offset to the tag's data
let structure_storage = self.storage.get(&structure).to_owned();
let stored_with_local = self.storage.ensure_value_has_local(
&mut self.code_builder,
structure,
structure_storage,
);
let (tag_local_id, tag_offset) = match stored_with_local {
let (tag_local_id, tag_offset) = match structure_storage {
StoredValue::StackMemory { location, .. } => {
location.local_and_offset(self.storage.stack_frame_pointer)
}
StoredValue::Local { local_id, .. } => (local_id, 0),
StoredValue::VirtualMachineStack { .. } => {
internal_error!("{:?} should have a local variable", structure)
}
};
let stores_tag_id_in_pointer = union_layout.stores_tag_id_in_pointer(TARGET_INFO);
@ -1944,7 +1883,6 @@ impl<'a, 'r> WasmBackend<'a, 'r> {
tag_id: TagIdIntType,
union_layout: &UnionLayout<'a>,
index: u64,
symbol: Symbol,
storage: &StoredValue,
) {
use UnionLayout::*;
@ -1977,20 +1915,11 @@ impl<'a, 'r> WasmBackend<'a, 'r> {
.sum();
// Get pointer and offset to the tag's data
let structure_storage = self.storage.get(&structure).to_owned();
let stored_with_local = self.storage.ensure_value_has_local(
&mut self.code_builder,
structure,
structure_storage,
);
let (tag_local_id, tag_offset) = match stored_with_local {
let (tag_local_id, tag_offset) = match self.storage.get(&structure) {
StoredValue::StackMemory { location, .. } => {
location.local_and_offset(self.storage.stack_frame_pointer)
}
StoredValue::Local { local_id, .. } => (local_id, 0),
StoredValue::VirtualMachineStack { .. } => {
internal_error!("{:?} should have a local variable", structure)
}
StoredValue::Local { local_id, .. } => (*local_id, 0),
};
let stores_tag_id_in_pointer = union_layout.stores_tag_id_in_pointer(TARGET_INFO);
@ -2007,12 +1936,8 @@ impl<'a, 'r> WasmBackend<'a, 'r> {
self.code_builder.i32_const(from_offset as _);
self.code_builder.i32_add();
let symbol_local = match self.storage.ensure_value_has_local(
&mut self.code_builder,
symbol,
storage.clone(),
) {
StoredValue::Local { local_id, .. } => local_id,
let symbol_local = match storage {
StoredValue::Local { local_id, .. } => *local_id,
_ => internal_error!("A heap pointer will always be an i32"),
};
@ -2025,11 +1950,6 @@ impl<'a, 'r> WasmBackend<'a, 'r> {
pub(crate) fn ptr_load(&mut self, ret_sym: Symbol, arg_sym: Symbol) {
let (from_addr_val, from_offset) = match self.storage.get(&arg_sym) {
StoredValue::VirtualMachineStack { .. } => {
self.storage
.load_symbols(&mut self.code_builder, &[arg_sym]);
(AddressValue::Loaded, 0)
}
StoredValue::Local { local_id, .. } => (AddressValue::NotLoaded(*local_id), 0),
StoredValue::StackMemory { location, .. } => {
let (local_id, offset) =
@ -2063,7 +1983,7 @@ impl<'a, 'r> WasmBackend<'a, 'r> {
) {
if !self.can_relocate_heap {
// This will probably only happen for test hosts.
panic!("The app tries to allocate heap memory but the host doesn't support that. It needs to export __heap_base");
panic!("The app tries to allocate heap memory but the host doesn't support that. It needs to export symbols __heap_base and __heap_end");
}
// Add extra bytes for the refcount
let extra_bytes = alignment_bytes.max(PTR_SIZE);
@ -2158,7 +2078,6 @@ impl<'a, 'r> WasmBackend<'a, 'r> {
&mut self,
initializer: Option<Symbol>,
element_layout: InLayout<'a>,
ret_symbol: Symbol,
ret_storage: &StoredValue,
) {
// Alloca : a -> Ptr a
@ -2181,12 +2100,8 @@ impl<'a, 'r> WasmBackend<'a, 'r> {
}
// create a local variable for the pointer
let ptr_local_id = match self.storage.ensure_value_has_local(
&mut self.code_builder,
ret_symbol,
ret_storage.clone(),
) {
StoredValue::Local { local_id, .. } => local_id,
let ptr_local_id = match ret_storage {
StoredValue::Local { local_id, .. } => *local_id,
_ => internal_error!("A pointer will always be an i32"),
};

5
crates/compiler/gen_wasm/src/code_builder.rs
View file

@ -152,6 +152,11 @@ impl<'a> CodeBuilder<'a> {
***********************************************************/
pub fn stack_is_empty(&self) -> bool {
let block = self.vm_block_stack.last().unwrap();
block.value_stack.is_empty()
}
fn current_stack(&self) -> &Vec<'a, Symbol> {
let block = self.vm_block_stack.last().unwrap();
&block.value_stack

8
crates/compiler/gen_wasm/src/lib.rs
View file

@ -243,11 +243,11 @@ pub struct WasmDebugSettings {
}
pub const DEBUG_SETTINGS: WasmDebugSettings = WasmDebugSettings {
proc_start_end: false && cfg!(debug_assertions),
user_procs_ir: false && cfg!(debug_assertions), // Note: we also have `ROC_PRINT_IR_AFTER_REFCOUNT=1 cargo test-gen-wasm`
proc_start_end: true && cfg!(debug_assertions),
user_procs_ir: true && cfg!(debug_assertions), // Note: we also have `ROC_PRINT_IR_AFTER_REFCOUNT=1 cargo test-gen-wasm`
helper_procs_ir: false && cfg!(debug_assertions),
let_stmt_ir: false && cfg!(debug_assertions),
instructions: false && cfg!(debug_assertions),
let_stmt_ir: true && cfg!(debug_assertions),
instructions: true && cfg!(debug_assertions),
storage_map: false && cfg!(debug_assertions),
keep_test_binary: false && cfg!(debug_assertions),
};

12
crates/compiler/gen_wasm/src/low_level.rs
View file

@ -103,7 +103,6 @@ impl From<&StoredValue> for CodeGenNumType {
fn from(stored: &StoredValue) -> CodeGenNumType {
use StoredValue::*;
match stored {
VirtualMachineStack { value_type, .. } => CodeGenNumType::from(*value_type),
Local { value_type, .. } => CodeGenNumType::from(*value_type),
StackMemory { format, .. } => CodeGenNumType::from(*format),
}
@ -2093,8 +2092,7 @@ impl<'a> LowLevelCall<'a> {
}
Unreachable => match self.ret_storage {
StoredValue::VirtualMachineStack { value_type, .. }
| StoredValue::Local { value_type, .. } => match value_type {
StoredValue::Local { value_type, .. } => match value_type {
ValueType::I32 => backend.code_builder.i32_const(0),
ValueType::I64 => backend.code_builder.i64_const(0),
ValueType::F32 => backend.code_builder.f32_const(0.0),
@ -2189,7 +2187,7 @@ impl<'a> LowLevelCall<'a> {
use StoredValue::*;
match backend.storage.get(&self.arguments[0]).to_owned() {
VirtualMachineStack { value_type, .. } | Local { value_type, .. } => {
Local { value_type, .. } => {
self.load_args(backend);
match self.lowlevel {
LowLevel::Eq => match value_type {
@ -2299,7 +2297,7 @@ fn num_is_nan(backend: &mut WasmBackend<'_, '_>, argument: Symbol) {
use StoredValue::*;
let stored = backend.storage.get(&argument).to_owned();
match stored {
VirtualMachineStack { value_type, .. } | Local { value_type, .. } => {
Local { value_type, .. } => {
backend
.storage
.load_symbols(&mut backend.code_builder, &[argument]);
@ -2362,7 +2360,7 @@ fn num_is_infinite(backend: &mut WasmBackend<'_, '_>, argument: Symbol) {
use StoredValue::*;
let stored = backend.storage.get(&argument).to_owned();
match stored {
VirtualMachineStack { value_type, .. } | Local { value_type, .. } => {
Local { value_type, .. } => {
backend
.storage
.load_symbols(&mut backend.code_builder, &[argument]);
@ -2405,7 +2403,7 @@ fn num_is_finite(backend: &mut WasmBackend<'_, '_>, argument: Symbol) {
use StoredValue::*;
let stored = backend.storage.get(&argument).to_owned();
match stored {
VirtualMachineStack { value_type, .. } | Local { value_type, .. } => {
Local { value_type, .. } => {
backend
.storage
.load_symbols(&mut backend.code_builder, &[argument]);

129
crates/compiler/gen_wasm/src/storage.rs
View file

@ -6,7 +6,7 @@ use roc_error_macros::internal_error;
use roc_module::symbol::Symbol;
use roc_mono::layout::{InLayout, STLayoutInterner};
use crate::code_builder::{CodeBuilder, VmSymbolState};
use crate::code_builder::CodeBuilder;
use crate::layout::{stack_memory_arg_types, ReturnMethod, StackMemoryFormat, WasmLayout};
use crate::{copy_memory, CopyMemoryConfig, PTR_TYPE};
use roc_wasm_module::{round_up_to_alignment, Align, LocalId, ValueType};
@ -33,13 +33,6 @@ impl StackMemoryLocation {
#[derive(Debug, Clone)]
pub enum StoredValue {
/// A value stored implicitly in the VM stack (primitives only)
VirtualMachineStack {
vm_state: VmSymbolState,
value_type: ValueType,
size: u32,
},
/// A local variable in the Wasm function (primitives only)
Local {
local_id: LocalId,
@ -63,14 +56,12 @@ impl StoredValue {
use ValueType::*;
match self {
// Simple numbers: 1 Roc argument => 1 Wasm argument
Self::VirtualMachineStack { value_type, .. } | Self::Local { value_type, .. } => {
match value_type {
Self::Local { value_type, .. } => match value_type {
I32 => &[I32],
I64 => &[I64],
F32 => &[F32],
F64 => &[F64],
}
}
},
// Stack memory values: 1 Roc argument => 0-2 Wasm arguments
Self::StackMemory { size, format, .. } => stack_memory_arg_types(*size, *format),
}
@ -178,12 +169,15 @@ impl<'a> Storage<'a> {
self.symbol_layouts.insert(symbol, layout);
let storage = match wasm_layout {
WasmLayout::Primitive(value_type, size) => StoredValue::VirtualMachineStack {
vm_state: VmSymbolState::NotYetPushed,
WasmLayout::Primitive(value_type, size) => {
let local_id = self.get_next_local_id();
self.local_types.push(value_type);
StoredValue::Local {
local_id,
value_type,
size,
},
}
}
WasmLayout::StackMemory {
size,
alignment_bytes,
@ -323,41 +317,6 @@ impl<'a> Storage<'a> {
fn load_symbol_ccc(&mut self, code_builder: &mut CodeBuilder, sym: Symbol) {
let storage = self.get(&sym).to_owned();
match storage {
StoredValue::VirtualMachineStack {
vm_state,
value_type,
size,
} => {
let next_local_id = self.get_next_local_id();
let maybe_next_vm_state = code_builder.load_symbol(sym, vm_state, next_local_id);
match maybe_next_vm_state {
// The act of loading the value changed the VM state, so update it
Some(next_vm_state) => {
self.symbol_storage_map.insert(
sym,
StoredValue::VirtualMachineStack {
vm_state: next_vm_state,
value_type,
size,
},
);
}
None => {
// Loading the value required creating a new local, because
// it was not in a convenient position in the VM stack.
self.local_types.push(value_type);
self.symbol_storage_map.insert(
sym,
StoredValue::Local {
local_id: next_local_id,
value_type,
size,
},
);
}
}
}
StoredValue::Local { local_id, .. } => {
code_builder.get_local(local_id);
code_builder.set_top_symbol(sym);
@ -409,7 +368,7 @@ impl<'a> Storage<'a> {
fn load_return_address_ccc(&mut self, code_builder: &mut CodeBuilder, sym: Symbol) {
let storage = self.get(&sym).to_owned();
match storage {
StoredValue::VirtualMachineStack { .. } | StoredValue::Local { .. } => {
StoredValue::Local { .. } => {
internal_error!("these storage types are not returned by writing to a pointer")
}
StoredValue::StackMemory { location, size, .. } => {
@ -530,10 +489,7 @@ impl<'a> Storage<'a> {
size
}
StoredValue::VirtualMachineStack {
value_type, size, ..
}
| StoredValue::Local {
StoredValue::Local {
value_type, size, ..
} => {
use roc_wasm_module::Align::*;
@ -604,10 +560,7 @@ impl<'a> Storage<'a> {
);
}
StoredValue::VirtualMachineStack {
value_type, size, ..
}
| StoredValue::Local {
StoredValue::Local {
value_type, size, ..
} => {
use roc_wasm_module::Align::*;
@ -646,31 +599,10 @@ impl<'a> Storage<'a> {
code_builder: &mut CodeBuilder,
to: &StoredValue,
from: &StoredValue,
from_symbol: Symbol,
) {
use StoredValue::*;
match (to, from) {
(
Local {
local_id: to_local_id,
value_type: to_value_type,
size: to_size,
},
VirtualMachineStack {
value_type: from_value_type,
size: from_size,
..
},
) => {
debug_assert!(to_value_type == from_value_type);
debug_assert!(to_size == from_size);
// Note: load_symbols will not destroy the value, so we can use it again later.
// It will leave a Popped marker in the VM stack model in CodeBuilder
self.load_symbols(code_builder, &[from_symbol]);
code_builder.set_local(*to_local_id);
}
(
Local {
local_id: to_local_id,
@ -726,39 +658,4 @@ impl<'a> Storage<'a> {
}
}
}
/// Ensure a StoredValue has an associated local (which could be the frame pointer!)
///
/// This is useful when a value needs to be accessed from a more deeply-nested block.
/// In that case we want to make sure it's not just stored in the VM stack, because
/// blocks can't access the VM stack from outer blocks, but they can access locals.
/// (In the case of structs in stack memory, we just use the stack frame pointer local)
pub fn ensure_value_has_local(
&mut self,
code_builder: &mut CodeBuilder,
symbol: Symbol,
storage: StoredValue,
) -> StoredValue {
if let StoredValue::VirtualMachineStack {
vm_state,
value_type,
size,
} = storage
{
let next_local_id = self.get_next_local_id();
code_builder.store_symbol_to_local(symbol, vm_state, next_local_id);
self.local_types.push(value_type);
let new_storage = StoredValue::Local {
local_id: next_local_id,
value_type,
size,
};
self.symbol_storage_map.insert(symbol, new_storage.clone());
new_storage
} else {
storage
}
}
}

2
crates/compiler/test_gen/src/helpers/wasm.rs
View file

@ -207,7 +207,7 @@ impl<'a> ImportDispatcher for TestDispatcher<'a> {
let msg = match panic_tag {
0 => format!(r#"Roc failed with message: "{roc_msg}""#),
1 => format!(r#"User crash with message: "{roc_msg}""#),
tag => format!(r#"Got an invald panic tag: "{panic_tag}""#),
_ => format!(r#"Got an invald panic tag: "{panic_tag}""#),
};
panic!("{}", msg)
} else {