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fix(es/minifier): Make if_return to not drop required returns (#4847)

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Donny/강동윤 2022-05-30 15:46:01 +09:00 committed by GitHub
parent 866664163e
commit 8365c3d0df
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GPG Key ID: 4AEE18F83AFDEB23
9 changed files with 466 additions and 10 deletions
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76
crates/swc/tests/fixture/issues-4xxx/4841/input/.swcrc Normal file
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@ -0,0 +1,76 @@
{
"jsc": {
"parser": {
"syntax": "ecmascript",
"jsx": false
},
"target": "es2021",
"loose": false,
"minify": {
"compress": {
"arguments": false,
"arrows": false,
"booleans": false,
"booleans_as_integers": false,
"collapse_vars": false,
"comparisons": false,
"computed_props": false,
"conditionals": false,
"dead_code": false,
"defaults": false,
"directives": false,
"drop_console": false,
"drop_debugger": false,
"ecma": 5,
"evaluate": false,
"expression": false,
"global_defs": {},
"hoist_funs": false,
"hoist_props": false,
"hoist_vars": false,
"ie8": false,
"if_return": true,
"inline": 0,
"join_vars": false,
"keep_classnames": false,
"keep_fargs": false,
"keep_fnames": false,
"keep_infinity": false,
"loops": false,
"module": false,
"negate_iife": false,
"passes": 1,
"properties": false,
"pure_funcs": [],
"pure_getters": false,
"reduce_funcs": false,
"reduce_vars": false,
"sequences": false,
"side_effects": false,
"switches": false,
"top_retain": [],
"toplevel": false,
"typeofs": false,
"unsafe": false,
"unsafe_arrows": false,
"unsafe_comps": false,
"unsafe_Function": false,
"unsafe_math": false,
"unsafe_methods": false,
"unsafe_proto": false,
"unsafe_regexp": false,
"unsafe_symbols": false,
"unsafe_undefined": false,
"unused": false
},
"mangle": true
},
"transform": {
"legacyDecorator": true
},
"externalHelpers": true
},
"module": {
"type": "es6"
}
}

11
crates/swc/tests/fixture/issues-4xxx/4841/input/input.js Normal file
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@ -0,0 +1,11 @@
global._processChunk = function _processChunk(chunk, async, newReq) {
if (chunk) {
if (!async) {
return true;
}
var newReq = this.write();
newReq.callback = callback;
return;
}
cb();
};

10
crates/swc/tests/fixture/issues-4xxx/4841/output/input.js Normal file
View File

@ -0,0 +1,10 @@
global._processChunk = function d(b, c, a) {
if (b) {
if (!c) {
return true;
}
var a = this.write();
return (a.callback = callback), void 0;
}
cb();
};

21
crates/swc_ecma_minifier/src/compress/optimize/if_return.rs
View File

@ -44,7 +44,7 @@ where
pub(super) fn merge_if_returns(
&mut self,
stmts: &mut Vec<Stmt>,
can_work: bool,
terminates: bool,
is_fn_body: bool,
) {
if !self.options.if_return {
@ -52,11 +52,11 @@ where
}
for stmt in stmts.iter_mut() {
self.merge_nested_if_returns(stmt, can_work);
self.merge_nested_if_returns(stmt, terminates);
}
if can_work || is_fn_body {
self.merge_if_returns_inner(stmts);
if terminates || is_fn_body {
self.merge_if_returns_inner(stmts, !is_fn_body);
}
}
@ -99,7 +99,7 @@ where
/// return a ? foo() : bar();
/// }
/// ```
fn merge_if_returns_inner(&mut self, stmts: &mut Vec<Stmt>) {
fn merge_if_returns_inner(&mut self, stmts: &mut Vec<Stmt>, should_preserve_last_return: bool) {
if !self.options.if_return {
return;
}
@ -366,11 +366,12 @@ where
if let Some(mut cur) = cur {
match &*cur {
Expr::Seq(seq)
if seq
.exprs
.last()
.map(|v| is_pure_undefined(&self.expr_ctx, v))
.unwrap_or(true) =>
if !should_preserve_last_return
&& seq
.exprs
.last()
.map(|v| is_pure_undefined(&self.expr_ctx, v))
.unwrap_or(true) =>
{
let expr = self.ignore_return_value(&mut cur);

270
crates/swc_ecma_minifier/tests/fixture/issues/4841/1/analysis-snapshot.rust-debug Normal file
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@ -0,0 +1,270 @@
TestSnapshot {
vars: [
(
(
Atom('_processChunk' type=dynamic),
#2,
),
VarUsageInfo {
inline_prevented: false,
ref_count: 0,
cond_init: false,
declared: false,
declared_count: 0,
declared_as_fn_param: false,
declared_as_fn_expr: true,
assign_count: 0,
mutation_by_call_count: 0,
usage_count: 0,
reassigned_with_assignment: false,
reassigned_with_var_decl: false,
mutated: false,
has_property_access: false,
has_property_mutation: false,
accessed_props: {},
exported: false,
used_above_decl: false,
is_fn_local: false,
used_by_nested_fn: false,
executed_multiple_time: false,
used_in_cond: false,
var_kind: None,
var_initialized: false,
declared_as_catch_param: false,
no_side_effect_for_member_access: false,
used_as_callee: false,
used_as_arg: false,
pure_fn: false,
infects: [],
},
),
(
(
Atom('async' type=static),
#2,
),
VarUsageInfo {
inline_prevented: false,
ref_count: 1,
cond_init: false,
declared: true,
declared_count: 1,
declared_as_fn_param: true,
declared_as_fn_expr: false,
assign_count: 0,
mutation_by_call_count: 0,
usage_count: 1,
reassigned_with_assignment: false,
reassigned_with_var_decl: false,
mutated: false,
has_property_access: false,
has_property_mutation: false,
accessed_props: {},
exported: false,
used_above_decl: false,
is_fn_local: true,
used_by_nested_fn: true,
executed_multiple_time: false,
used_in_cond: true,
var_kind: None,
var_initialized: false,
declared_as_catch_param: false,
no_side_effect_for_member_access: false,
used_as_callee: false,
used_as_arg: false,
pure_fn: false,
infects: [],
},
),
(
(
Atom('callback' type=dynamic),
#1,
),
VarUsageInfo {
inline_prevented: false,
ref_count: 1,
cond_init: false,
declared: false,
declared_count: 0,
declared_as_fn_param: false,
declared_as_fn_expr: false,
assign_count: 0,
mutation_by_call_count: 0,
usage_count: 1,
reassigned_with_assignment: false,
reassigned_with_var_decl: false,
mutated: false,
has_property_access: false,
has_property_mutation: false,
accessed_props: {},
exported: false,
used_above_decl: true,
is_fn_local: true,
used_by_nested_fn: true,
executed_multiple_time: false,
used_in_cond: true,
var_kind: None,
var_initialized: false,
declared_as_catch_param: false,
no_side_effect_for_member_access: false,
used_as_callee: false,
used_as_arg: false,
pure_fn: false,
infects: [],
},
),
(
(
Atom('cb' type=inline),
#1,
),
VarUsageInfo {
inline_prevented: false,
ref_count: 1,
cond_init: false,
declared: false,
declared_count: 0,
declared_as_fn_param: false,
declared_as_fn_expr: false,
assign_count: 0,
mutation_by_call_count: 0,
usage_count: 1,
reassigned_with_assignment: false,
reassigned_with_var_decl: false,
mutated: false,
has_property_access: false,
has_property_mutation: false,
accessed_props: {},
exported: false,
used_above_decl: true,
is_fn_local: true,
used_by_nested_fn: true,
executed_multiple_time: false,
used_in_cond: false,
var_kind: None,
var_initialized: false,
declared_as_catch_param: false,
no_side_effect_for_member_access: false,
used_as_callee: true,
used_as_arg: false,
pure_fn: false,
infects: [],
},
),
(
(
Atom('chunk' type=inline),
#2,
),
VarUsageInfo {
inline_prevented: false,
ref_count: 1,
cond_init: false,
declared: true,
declared_count: 1,
declared_as_fn_param: true,
declared_as_fn_expr: false,
assign_count: 0,
mutation_by_call_count: 0,
usage_count: 1,
reassigned_with_assignment: false,
reassigned_with_var_decl: false,
mutated: false,
has_property_access: false,
has_property_mutation: false,
accessed_props: {},
exported: false,
used_above_decl: false,
is_fn_local: true,
used_by_nested_fn: true,
executed_multiple_time: false,
used_in_cond: false,
var_kind: None,
var_initialized: false,
declared_as_catch_param: false,
no_side_effect_for_member_access: false,
used_as_callee: false,
used_as_arg: false,
pure_fn: false,
infects: [],
},
),
(
(
Atom('global' type=static),
#1,
),
VarUsageInfo {
inline_prevented: false,
ref_count: 1,
cond_init: false,
declared: false,
declared_count: 0,
declared_as_fn_param: false,
declared_as_fn_expr: false,
assign_count: 0,
mutation_by_call_count: 0,
usage_count: 1,
reassigned_with_assignment: false,
reassigned_with_var_decl: false,
mutated: true,
has_property_access: true,
has_property_mutation: true,
accessed_props: {},
exported: false,
used_above_decl: true,
is_fn_local: true,
used_by_nested_fn: false,
executed_multiple_time: false,
used_in_cond: false,
var_kind: None,
var_initialized: false,
declared_as_catch_param: false,
no_side_effect_for_member_access: false,
used_as_callee: false,
used_as_arg: false,
pure_fn: false,
infects: [],
},
),
(
(
Atom('newReq' type=inline),
#2,
),
VarUsageInfo {
inline_prevented: false,
ref_count: 1,
cond_init: true,
declared: true,
declared_count: 2,
declared_as_fn_param: true,
declared_as_fn_expr: false,
assign_count: 0,
mutation_by_call_count: 0,
usage_count: 1,
reassigned_with_assignment: false,
reassigned_with_var_decl: false,
mutated: true,
has_property_access: true,
has_property_mutation: true,
accessed_props: {},
exported: false,
used_above_decl: false,
is_fn_local: true,
used_by_nested_fn: true,
executed_multiple_time: false,
used_in_cond: true,
var_kind: None,
var_initialized: false,
declared_as_catch_param: false,
no_side_effect_for_member_access: false,
used_as_callee: false,
used_as_arg: false,
pure_fn: false,
infects: [],
},
),
],
}

56
crates/swc_ecma_minifier/tests/fixture/issues/4841/1/config.json Normal file
View File

@ -0,0 +1,56 @@
{
"arguments": false,
"arrows": false,
"booleans": false,
"booleans_as_integers": false,
"collapse_vars": false,
"comparisons": false,
"computed_props": false,
"conditionals": false,
"dead_code": false,
"defaults": false,
"directives": false,
"drop_console": false,
"drop_debugger": false,
"ecma": 5,
"evaluate": false,
"expression": false,
"global_defs": {},
"hoist_funs": false,
"hoist_props": false,
"hoist_vars": false,
"ie8": false,
"if_return": true,
"inline": 0,
"join_vars": false,
"keep_classnames": false,
"keep_fargs": false,
"keep_fnames": false,
"keep_infinity": false,
"loops": false,
"module": false,
"negate_iife": false,
"passes": 1,
"properties": false,
"pure_funcs": [],
"pure_getters": false,
"reduce_funcs": false,
"reduce_vars": false,
"sequences": false,
"side_effects": false,
"switches": false,
"top_retain": [],
"toplevel": false,
"typeofs": false,
"unsafe": false,
"unsafe_arrows": false,
"unsafe_comps": false,
"unsafe_Function": false,
"unsafe_math": false,
"unsafe_methods": false,
"unsafe_proto": false,
"unsafe_regexp": false,
"unsafe_symbols": false,
"unsafe_undefined": false,
"unused": false
}

11
crates/swc_ecma_minifier/tests/fixture/issues/4841/1/input.js Normal file
View File

@ -0,0 +1,11 @@
global._processChunk = function _processChunk(chunk, async, newReq) {
if (chunk) {
if (!async) {
return true;
}
var newReq = this.write();
newReq.callback = callback;
return;
}
cb();
};

10
crates/swc_ecma_minifier/tests/fixture/issues/4841/1/output.js Normal file
View File

@ -0,0 +1,10 @@
global._processChunk = function _processChunk(chunk, async, newReq) {
if (chunk) {
if (!async) {
return true;
}
var newReq = this.write();
return (newReq.callback = callback), void 0;
}
cb();
};

11
crates/swc_ecma_minifier/tests/fixture/issues/4841/1/output.mangleOnly.js Normal file
View File

@ -0,0 +1,11 @@
global._processChunk = function d(b, c, a) {
if (b) {
if (!c) {
return true;
}
var a = this.write();
a.callback = callback;
return;
}
cb();
};