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<span class="Comment">//: Addresses passed into of a recipe are meant to be immutable unless they're</span>
<span class="Comment">//: also products. This layer will start enforcing this check.</span>
<span class="Delimiter">:(scenario can_modify_value_ingredients)</span>
<span class="Special">% Hide_warnings = true;</span>
recipe main [
local-scope
p:address:shared:point<span class="Special"> <- </span>new point:type
foo *p
]
recipe foo p:point [
local-scope
load-ingredients
x:address:number<span class="Special"> <- </span>get-address p<span class="Delimiter">,</span> x:offset
*x<span class="Special"> <- </span>copy <span class="Constant">34</span>
]
$warn: <span class="Constant">0</span>
<span class="Delimiter">:(scenario can_modify_ingredients_that_are_also_products)</span>
<span class="Special">% Hide_warnings = true;</span>
recipe main [
local-scope
p:address:shared:point<span class="Special"> <- </span>new point:type
p<span class="Special"> <- </span>foo p
]
recipe foo p:address:shared:point <span class="Delimiter">-></span> p:address:shared:point [
local-scope
load-ingredients
x:address:number<span class="Special"> <- </span>get-address *p<span class="Delimiter">,</span> x:offset
*x<span class="Special"> <- </span>copy <span class="Constant">34</span>
]
$warn: <span class="Constant">0</span>
<span class="Delimiter">:(scenario ignore_literal_ingredients_for_immutability_checks)</span>
<span class="Special">% Hide_warnings = true;</span>
recipe main [
local-scope
p:address:shared:d1<span class="Special"> <- </span>new d1:type
q:number<span class="Special"> <- </span>foo p
]
recipe foo p:address:shared:d1 <span class="Delimiter">-></span> q:number [
local-scope
load-ingredients
x:address:shared:d1<span class="Special"> <- </span>new d1:type
y:address:number<span class="Special"> <- </span>get-address *x<span class="Delimiter">,</span> p:offset <span class="Comment"># ignore this 'p'</span>
q<span class="Special"> <- </span>copy <span class="Constant">34</span>
]
container d1 [
p:number
q:number
]
$warn: <span class="Constant">0</span>
<span class="Delimiter">:(scenario cannot_take_address_inside_immutable_ingredients)</span>
<span class="Special">% Hide_warnings = true;</span>
recipe main [
local-scope
p:address:shared:point<span class="Special"> <- </span>new point:type
foo p
]
recipe foo p:address:shared:point [
local-scope
load-ingredients
x:address:number<span class="Special"> <- </span>get-address *p<span class="Delimiter">,</span> x:offset
*x<span class="Special"> <- </span>copy <span class="Constant">34</span>
]
<span class="traceContains">+warn: foo: cannot modify ingredient p after instruction 'x:address:number <- get-address *p, x:offset' because it's not also a product of foo</span>
<span class="Delimiter">:(scenario cannot_call_mutating_recipes_on_immutable_ingredients)</span>
<span class="Special">% Hide_warnings = true;</span>
recipe main [
local-scope
p:address:shared:point<span class="Special"> <- </span>new point:type
foo p
]
recipe foo p:address:shared:point [
local-scope
load-ingredients
bar p
]
recipe bar p:address:shared:point <span class="Delimiter">-></span> p:address:shared:point [
local-scope
load-ingredients
x:address:number<span class="Special"> <- </span>get-address *p<span class="Delimiter">,</span> x:offset
*x<span class="Special"> <- </span>copy <span class="Constant">34</span>
]
<span class="traceContains">+warn: foo: cannot modify ingredient p at instruction 'bar p' because it's not also a product of foo</span>
<span class="Delimiter">:(scenario cannot_modify_copies_of_immutable_ingredients)</span>
<span class="Special">% Hide_warnings = true;</span>
recipe main [
local-scope
p:address:shared:point<span class="Special"> <- </span>new point:type
foo p
]
recipe foo p:address:shared:point [
local-scope
load-ingredients
q:address:shared:point<span class="Special"> <- </span>copy p
x:address:number<span class="Special"> <- </span>get-address *q<span class="Delimiter">,</span> x:offset
]
<span class="traceContains">+warn: foo: cannot modify q after instruction 'x:address:number <- get-address *q, x:offset' because that would modify ingredient p which is not also a product of foo</span>
<span class="Delimiter">:(scenario can_traverse_immutable_ingredients)</span>
<span class="Special">% Hide_warnings = true;</span>
container test-list [
next:address:shared:test-list
]
recipe main [
local-scope
p:address:shared:test-list<span class="Special"> <- </span>new test-list:type
foo p
]
recipe foo p:address:shared:test-list [
local-scope
load-ingredients
p2:address:shared:test-list<span class="Special"> <- </span>bar p
]
recipe bar x:address:shared:test-list <span class="Delimiter">-></span> y:address:shared:test-list [
local-scope
load-ingredients
y<span class="Special"> <- </span>get *x<span class="Delimiter">,</span> next:offset
]
$warn: <span class="Constant">0</span>
<span class="Delimiter">:(scenario handle_optional_ingredients_in_immutability_checks)</span>
<span class="Special">% Hide_warnings = true;</span>
recipe main [
k:address:shared:number<span class="Special"> <- </span>new number:type
test k
]
<span class="Comment"># recipe taking an immutable address ingredient</span>
recipe test k:address:shared:number [
local-scope
load-ingredients
foo k
]
<span class="Comment"># ..calling a recipe with an optional address ingredient</span>
recipe foo <span class="Delimiter">-></span> [
local-scope
load-ingredients
k:address:shared:number<span class="Delimiter">,</span> found?:boolean<span class="Special"> <- </span>next-ingredient
]
$warn: <span class="Constant">0</span>
<span class="Delimiter">:(before "End Transforms")</span>
Transform<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>check_immutable_ingredients<span class="Delimiter">);</span> <span class="Comment">// idempotent</span>
<span class="Delimiter">:(code)</span>
void check_immutable_ingredients<span class="Delimiter">(</span>recipe_ordinal r<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span class="Comment">// to ensure a reagent isn't modified, it suffices to show that we never</span>
<span class="Comment">// call get-address or index-address with it, and that any non-primitive</span>
<span class="Comment">// recipe calls in the body aren't returning it as a product.</span>
const recipe& caller = get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">);</span>
<span class="CommentedCode">//? cerr << caller.name << '\n';</span>
if <span class="Delimiter">(</span>!caller<span class="Delimiter">.</span>has_header<span class="Delimiter">)</span> <span class="Identifier">return</span><span class="Delimiter">;</span> <span class="Comment">// skip check for old-style recipes calling next-ingredient directly</span>
for <span class="Delimiter">(</span>long long int i = <span class="Constant">0</span><span class="Delimiter">;</span> i < SIZE<span class="Delimiter">(</span>caller<span class="Delimiter">.</span>ingredients<span class="Delimiter">);</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
const reagent& current_ingredient = caller<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
<span class="CommentedCode">//? cerr << " " << current_ingredient.original_string << '\n';</span>
if <span class="Delimiter">(</span>!is_mu_address<span class="Delimiter">(</span>current_ingredient<span class="Delimiter">))</span> <span class="Identifier">continue</span><span class="Delimiter">;</span> <span class="Comment">// will be copied</span>
if <span class="Delimiter">(</span>is_present_in_products<span class="Delimiter">(</span>caller<span class="Delimiter">,</span> current_ingredient<span class="Delimiter">.</span>name<span class="Delimiter">))</span> <span class="Identifier">continue</span><span class="Delimiter">;</span> <span class="Comment">// not expected to be immutable</span>
<span class="Comment">// End Immutable Ingredients Special-cases</span>
set<string> immutable_vars<span class="Delimiter">;</span>
immutable_vars<span class="Delimiter">.</span>insert<span class="Delimiter">(</span>current_ingredient<span class="Delimiter">.</span>name<span class="Delimiter">);</span>
for <span class="Delimiter">(</span>long long int i = <span class="Constant">0</span><span class="Delimiter">;</span> i < SIZE<span class="Delimiter">(</span>caller<span class="Delimiter">.</span>steps<span class="Delimiter">);</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
const instruction& inst = caller<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
<span class="CommentedCode">//? cerr << " " << inst.to_string() << '\n';</span>
check_immutable_ingredient_in_instruction<span class="Delimiter">(</span>inst<span class="Delimiter">,</span> immutable_vars<span class="Delimiter">,</span> current_ingredient<span class="Delimiter">.</span>name<span class="Delimiter">,</span> caller<span class="Delimiter">);</span>
update_aliases<span class="Delimiter">(</span>inst<span class="Delimiter">,</span> immutable_vars<span class="Delimiter">);</span>
<span class="Delimiter">}</span>
<span class="Delimiter">}</span>
<span class="Delimiter">}</span>
void update_aliases<span class="Delimiter">(</span>const instruction& inst<span class="Delimiter">,</span> set<string>& current_ingredient_and_aliases<span class="Delimiter">)</span> <span class="Delimiter">{</span>
set<long long int> current_ingredient_indices = ingredient_indices<span class="Delimiter">(</span>inst<span class="Delimiter">,</span> current_ingredient_and_aliases<span class="Delimiter">);</span>
if <span class="Delimiter">(</span>!contains_key<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> inst<span class="Delimiter">.</span>operation<span class="Delimiter">))</span> <span class="Delimiter">{</span>
<span class="Comment">// primitive recipe</span>
if <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>operation == COPY<span class="Delimiter">)</span> <span class="Delimiter">{</span>
for <span class="Delimiter">(</span>set<long long int>::iterator p = current_ingredient_indices<span class="Delimiter">.</span>begin<span class="Delimiter">();</span> p != current_ingredient_indices<span class="Delimiter">.</span>end<span class="Delimiter">();</span> ++p<span class="Delimiter">)</span> <span class="Delimiter">{</span>
current_ingredient_and_aliases<span class="Delimiter">.</span>insert<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>*p<span class="Delimiter">).</span>name<span class="Delimiter">);</span>
<span class="Delimiter">}</span>
<span class="Delimiter">}</span>
<span class="Delimiter">}</span>
else <span class="Delimiter">{</span>
<span class="Comment">// defined recipe</span>
set<long long int> contained_in_product_indices = scan_contained_in_product_indices<span class="Delimiter">(</span>inst<span class="Delimiter">,</span> current_ingredient_indices<span class="Delimiter">);</span>
for <span class="Delimiter">(</span>set<long long int>::iterator p = contained_in_product_indices<span class="Delimiter">.</span>begin<span class="Delimiter">();</span> p != contained_in_product_indices<span class="Delimiter">.</span>end<span class="Delimiter">();</span> ++p<span class="Delimiter">)</span> <span class="Delimiter">{</span>
if <span class="Delimiter">(</span>*p < SIZE<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">))</span>
current_ingredient_and_aliases<span class="Delimiter">.</span>insert<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>*p<span class="Delimiter">).</span>name<span class="Delimiter">);</span>
<span class="Delimiter">}</span>
<span class="Delimiter">}</span>
<span class="Delimiter">}</span>
set<long long int> scan_contained_in_product_indices<span class="Delimiter">(</span>const instruction& inst<span class="Delimiter">,</span> set<long long int>& ingredient_indices<span class="Delimiter">)</span> <span class="Delimiter">{</span>
set<string> selected_ingredient_names<span class="Delimiter">;</span>
const recipe& callee = get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> inst<span class="Delimiter">.</span>operation<span class="Delimiter">);</span>
for <span class="Delimiter">(</span>set<long long int>::iterator p = ingredient_indices<span class="Delimiter">.</span>begin<span class="Delimiter">();</span> p != ingredient_indices<span class="Delimiter">.</span>end<span class="Delimiter">();</span> ++p<span class="Delimiter">)</span> <span class="Delimiter">{</span>
if <span class="Delimiter">(</span>*p >= SIZE<span class="Delimiter">(</span>callee<span class="Delimiter">.</span>ingredients<span class="Delimiter">))</span> <span class="Identifier">continue</span><span class="Delimiter">;</span> <span class="Comment">// optional immutable ingredient</span>
selected_ingredient_names<span class="Delimiter">.</span>insert<span class="Delimiter">(</span>callee<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>*p<span class="Delimiter">).</span>name<span class="Delimiter">);</span>
<span class="Delimiter">}</span>
set<long long int> result<span class="Delimiter">;</span>
for <span class="Delimiter">(</span>long long int i = <span class="Constant">0</span><span class="Delimiter">;</span> i < SIZE<span class="Delimiter">(</span>callee<span class="Delimiter">.</span>products<span class="Delimiter">);</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
const reagent& current_product = callee<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
const string_tree* contained_in_name = property<span class="Delimiter">(</span>current_product<span class="Delimiter">,</span> <span class="Constant">"contained-in"</span><span class="Delimiter">);</span>
if <span class="Delimiter">(</span>contained_in_name && selected_ingredient_names<span class="Delimiter">.</span>find<span class="Delimiter">(</span>contained_in_name<span class="Delimiter">-></span>value<span class="Delimiter">)</span> != selected_ingredient_names<span class="Delimiter">.</span>end<span class="Delimiter">())</span>
result<span class="Delimiter">.</span>insert<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
<span class="Delimiter">}</span>
<span class="Identifier">return</span> result<span class="Delimiter">;</span>
<span class="Delimiter">}</span>
<span class="Delimiter">:(scenarios transform)</span>
<span class="Delimiter">:(scenario immutability_infects_contained_in_variables)</span>
<span class="Special">% Hide_warnings = true;</span>
container test-list [
next:address:shared:test-list
]
recipe main [
local-scope
p:address:shared:test-list<span class="Special"> <- </span>new test-list:type
foo p
]
recipe foo p:address:shared:test-list [ <span class="Comment"># p is immutable</span>
local-scope
load-ingredients
p2:address:shared:test-list<span class="Special"> <- </span>test-next p <span class="Comment"># p2 is immutable</span>
p3:address:address:shared:test-list<span class="Special"> <- </span>get-address *p2<span class="Delimiter">,</span> next:offset <span class="Comment"># signal modification of p2</span>
]
recipe test-next x:address:shared:test-list <span class="Delimiter">-></span> y:address:shared:test-list/contained-in:x [
local-scope
load-ingredients
y<span class="Special"> <- </span>get *x<span class="Delimiter">,</span> next:offset
]
<span class="traceContains">+warn: foo: cannot modify p2 after instruction 'p3:address:address:shared:test-list <- get-address *p2, next:offset' because that would modify ingredient p which is not also a product of foo</span>
<span class="Delimiter">:(code)</span>
void check_immutable_ingredient_in_instruction<span class="Delimiter">(</span>const instruction& inst<span class="Delimiter">,</span> const set<string>& current_ingredient_and_aliases<span class="Delimiter">,</span> const string& original_ingredient_name<span class="Delimiter">,</span> const recipe& caller<span class="Delimiter">)</span> <span class="Delimiter">{</span>
set<long long int> current_ingredient_indices = ingredient_indices<span class="Delimiter">(</span>inst<span class="Delimiter">,</span> current_ingredient_and_aliases<span class="Delimiter">);</span>
if <span class="Delimiter">(</span>current_ingredient_indices<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Identifier">return</span><span class="Delimiter">;</span> <span class="Comment">// ingredient not found in call</span>
for <span class="Delimiter">(</span>set<long long int>::iterator p = current_ingredient_indices<span class="Delimiter">.</span>begin<span class="Delimiter">();</span> p != current_ingredient_indices<span class="Delimiter">.</span>end<span class="Delimiter">();</span> ++p<span class="Delimiter">)</span> <span class="Delimiter">{</span>
const long long int current_ingredient_index = *p<span class="Delimiter">;</span>
<span class="CommentedCode">//? cerr << " ingredient index: " << *p << '\n';</span>
reagent current_ingredient = inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>current_ingredient_index<span class="Delimiter">);</span>
canonize_type<span class="Delimiter">(</span>current_ingredient<span class="Delimiter">);</span>
const string& current_ingredient_name = current_ingredient<span class="Delimiter">.</span>name<span class="Delimiter">;</span>
if <span class="Delimiter">(</span>!contains_key<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> inst<span class="Delimiter">.</span>operation<span class="Delimiter">))</span> <span class="Delimiter">{</span>
<span class="Comment">// primitive recipe</span>
if <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>operation == GET_ADDRESS || inst<span class="Delimiter">.</span>operation == INDEX_ADDRESS<span class="Delimiter">)</span> <span class="Delimiter">{</span>
if <span class="Delimiter">(</span>current_ingredient_name == original_ingredient_name<span class="Delimiter">)</span>
raise << maybe<span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> << <span class="Constant">"cannot modify ingredient "</span> << current_ingredient_name << <span class="Constant">" after instruction '"</span> << inst<span class="Delimiter">.</span>to_string<span class="Delimiter">()</span> << <span class="Constant">"' because it's not also a product of "</span> << caller<span class="Delimiter">.</span>name << <span class="cSpecial">'\n'</span> << end<span class="Delimiter">();</span>
else
raise << maybe<span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> << <span class="Constant">"cannot modify "</span> << current_ingredient_name << <span class="Constant">" after instruction '"</span> << inst<span class="Delimiter">.</span>to_string<span class="Delimiter">()</span> << <span class="Constant">"' because that would modify ingredient "</span> << original_ingredient_name << <span class="Constant">" which is not also a product of "</span> << caller<span class="Delimiter">.</span>name << <span class="cSpecial">'\n'</span> << end<span class="Delimiter">();</span>
<span class="Delimiter">}</span>
<span class="Delimiter">}</span>
else <span class="Delimiter">{</span>
<span class="Comment">// defined recipe</span>
if <span class="Delimiter">(</span>!is_mu_address<span class="Delimiter">(</span>current_ingredient<span class="Delimiter">))</span> <span class="Identifier">return</span><span class="Delimiter">;</span> <span class="Comment">// making a copy is ok</span>
if <span class="Delimiter">(</span>is_modified_in_recipe<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>operation<span class="Delimiter">,</span> current_ingredient_index<span class="Delimiter">,</span> caller<span class="Delimiter">))</span> <span class="Delimiter">{</span>
if <span class="Delimiter">(</span>current_ingredient_name == original_ingredient_name<span class="Delimiter">)</span>
raise << maybe<span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> << <span class="Constant">"cannot modify ingredient "</span> << current_ingredient_name << <span class="Constant">" at instruction '"</span> << inst<span class="Delimiter">.</span>to_string<span class="Delimiter">()</span> << <span class="Constant">"' because it's not also a product of "</span> << caller<span class="Delimiter">.</span>name << <span class="cSpecial">'\n'</span> << end<span class="Delimiter">();</span>
else
raise << maybe<span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> << <span class="Constant">"cannot modify "</span> << current_ingredient_name << <span class="Constant">" after instruction '"</span> << inst<span class="Delimiter">.</span>to_string<span class="Delimiter">()</span> << <span class="Constant">"' because that would modify ingredient "</span> << original_ingredient_name << <span class="Constant">" which is not also a product of "</span> << caller<span class="Delimiter">.</span>name << <span class="cSpecial">'\n'</span> << end<span class="Delimiter">();</span>
<span class="Delimiter">}</span>
<span class="Delimiter">}</span>
<span class="Delimiter">}</span>
<span class="Delimiter">}</span>
bool is_modified_in_recipe<span class="Delimiter">(</span>recipe_ordinal r<span class="Delimiter">,</span> long long int ingredient_index<span class="Delimiter">,</span> const recipe& caller<span class="Delimiter">)</span> <span class="Delimiter">{</span>
const recipe& callee = get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">);</span>
if <span class="Delimiter">(</span>!callee<span class="Delimiter">.</span>has_header<span class="Delimiter">)</span> <span class="Delimiter">{</span>
raise << maybe<span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> << <span class="Constant">"can't check mutability of ingredients in "</span> << callee<span class="Delimiter">.</span>name << <span class="Constant">" because it uses 'next-ingredient' directly, rather than a recipe header.</span><span class="cSpecial">\n</span><span class="Constant">"</span> << end<span class="Delimiter">();</span>
<span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
if <span class="Delimiter">(</span>ingredient_index >= SIZE<span class="Delimiter">(</span>callee<span class="Delimiter">.</span>ingredients<span class="Delimiter">))</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span> <span class="Comment">// optional immutable ingredient</span>
<span class="Identifier">return</span> is_present_in_products<span class="Delimiter">(</span>callee<span class="Delimiter">,</span> callee<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>ingredient_index<span class="Delimiter">).</span>name<span class="Delimiter">);</span>
<span class="Delimiter">}</span>
bool is_present_in_products<span class="Delimiter">(</span>const recipe& callee<span class="Delimiter">,</span> const string& ingredient_name<span class="Delimiter">)</span> <span class="Delimiter">{</span>
for <span class="Delimiter">(</span>long long int i = <span class="Constant">0</span><span class="Delimiter">;</span> i < SIZE<span class="Delimiter">(</span>callee<span class="Delimiter">.</span>products<span class="Delimiter">);</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
if <span class="Delimiter">(</span>callee<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>name == ingredient_name<span class="Delimiter">)</span>
<span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
<span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
bool is_present_in_ingredients<span class="Delimiter">(</span>const recipe& callee<span class="Delimiter">,</span> const string& ingredient_name<span class="Delimiter">)</span> <span class="Delimiter">{</span>
for <span class="Delimiter">(</span>long long int i = <span class="Constant">0</span><span class="Delimiter">;</span> i < SIZE<span class="Delimiter">(</span>callee<span class="Delimiter">.</span>ingredients<span class="Delimiter">);</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
if <span class="Delimiter">(</span>callee<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>name == ingredient_name<span class="Delimiter">)</span>
<span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
<span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
set<long long int> ingredient_indices<span class="Delimiter">(</span>const instruction& inst<span class="Delimiter">,</span> const set<string>& ingredient_names<span class="Delimiter">)</span> <span class="Delimiter">{</span>
set<long long int> result<span class="Delimiter">;</span>
for <span class="Delimiter">(</span>long long int i = <span class="Constant">0</span><span class="Delimiter">;</span> i < SIZE<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">);</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
if <span class="Delimiter">(</span>is_literal<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)))</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
if <span class="Delimiter">(</span>ingredient_names<span class="Delimiter">.</span>find<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>name<span class="Delimiter">)</span> != ingredient_names<span class="Delimiter">.</span>end<span class="Delimiter">())</span>
result<span class="Delimiter">.</span>insert<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
<span class="Delimiter">}</span>
<span class="Identifier">return</span> result<span class="Delimiter">;</span>
<span class="Delimiter">}</span>
<span class="Comment">//: Sometimes you want to pass in two addresses, one pointing inside the</span>
<span class="Comment">//: other. For example, you want to delete a node from a linked list. You</span>
<span class="Comment">//: can't pass both pointers back out, because if a caller tries to make both</span>
<span class="Comment">//: identical then you can't tell which value will be written on the way out.</span>
<span class="Comment">//:</span>
<span class="Comment">//: Experimental solution: just tell mu that one points inside the other.</span>
<span class="Comment">//: This way we can return just one pointer as high up as necessary to capture</span>
<span class="Comment">//: all modifications performed by a recipe.</span>
<span class="Comment">//:</span>
<span class="Comment">//: We'll see if we end up wanting to abuse /contained-in for other reasons.</span>
<span class="Delimiter">:(scenarios transform)</span>
<span class="Delimiter">:(scenario can_modify_contained_in_addresses)</span>
<span class="Special">% Hide_warnings = true;</span>
container test-list [
next:address:shared:test-list
]
recipe main [
local-scope
p:address:shared:test-list<span class="Special"> <- </span>new test-list:type
foo p
]
recipe foo p:address:shared:test-list <span class="Delimiter">-></span> p:address:shared:test-list [
local-scope
load-ingredients
p2:address:shared:test-list<span class="Special"> <- </span>test-next p
p<span class="Special"> <- </span>test-remove p2<span class="Delimiter">,</span> p
]
recipe test-next x:address:shared:test-list <span class="Delimiter">-></span> y:address:shared:test-list [
local-scope
load-ingredients
y<span class="Special"> <- </span>get *x<span class="Delimiter">,</span> next:offset
]
recipe test-remove x:address:shared:test-list/contained-in:from<span class="Delimiter">,</span> from:address:shared:test-list <span class="Delimiter">-></span> from:address:shared:test-list [
local-scope
load-ingredients
x2:address:address:shared:test-list<span class="Special"> <- </span>get-address *x<span class="Delimiter">,</span> next:offset <span class="Comment"># pretend modification</span>
]
$warn: <span class="Constant">0</span>
<span class="Delimiter">:(before "End Immutable Ingredients Special-cases")</span>
if <span class="Delimiter">(</span>has_property<span class="Delimiter">(</span>current_ingredient<span class="Delimiter">,</span> <span class="Constant">"contained-in"</span><span class="Delimiter">))</span> <span class="Delimiter">{</span>
const string_tree* tmp = property<span class="Delimiter">(</span>current_ingredient<span class="Delimiter">,</span> <span class="Constant">"contained-in"</span><span class="Delimiter">);</span>
if <span class="Delimiter">(</span>tmp<span class="Delimiter">-></span>left || tmp<span class="Delimiter">-></span>right
|| !is_present_in_ingredients<span class="Delimiter">(</span>caller<span class="Delimiter">,</span> tmp<span class="Delimiter">-></span>value<span class="Delimiter">)</span>
|| !is_present_in_products<span class="Delimiter">(</span>caller<span class="Delimiter">,</span> tmp<span class="Delimiter">-></span>value<span class="Delimiter">))</span>
raise_error << maybe<span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> << <span class="Constant">"contained-in can only point to another ingredient+product, but got "</span> << debug_string<span class="Delimiter">(</span>property<span class="Delimiter">(</span>current_ingredient<span class="Delimiter">,</span> <span class="Constant">"contained-in"</span><span class="Delimiter">))</span> << <span class="cSpecial">'\n'</span> << end<span class="Delimiter">();</span>
<span class="Identifier">continue</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
</pre>
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