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<span class="Comment">//: A simple memory allocator to create space for new variables at runtime.</span>
<span class="Delimiter">:(scenarios run)</span>
<span class="Delimiter">:(scenario new)</span>
<span class="Comment"># call new two times with identical arguments; you should get back different results</span>
recipe main [
<span class="Constant">1</span>:address:number/<span class="Special">raw <- </span>new number:type
<span class="Constant">2</span>:address:number/<span class="Special">raw <- </span>new number:type
<span class="Constant">3</span>:boolean/<span class="Special">raw <- </span>equal <span class="Constant">1</span>:address:number/<span class="Special">raw</span><span class="Delimiter">,</span> <span class="Constant">2</span>:address:number/<span class="Special">raw</span>
]
<span class="traceContains">+mem: storing 0 in location 3</span>
<span class="Delimiter">:(before "End Globals")</span>
long long int Reserved_for_tests = <span class="Constant">1000</span><span class="Delimiter">;</span>
long long int Memory_allocated_until = Reserved_for_tests<span class="Delimiter">;</span>
long long int Initial_memory_per_routine = <span class="Constant">100000</span><span class="Delimiter">;</span>
<span class="Delimiter">:(before "End Setup")</span>
Memory_allocated_until = Reserved_for_tests<span class="Delimiter">;</span>
Initial_memory_per_routine = <span class="Constant">100000</span><span class="Delimiter">;</span>
<span class="Delimiter">:(before "End routine Fields")</span>
long long int alloc<span class="Delimiter">,</span> alloc_max<span class="Delimiter">;</span>
<span class="Delimiter">:(before "End routine Constructor")</span>
alloc = Memory_allocated_until<span class="Delimiter">;</span>
Memory_allocated_until += Initial_memory_per_routine<span class="Delimiter">;</span>
alloc_max = Memory_allocated_until<span class="Delimiter">;</span>
trace<span class="Delimiter">(</span>Primitive_recipe_depth<span class="Delimiter">,</span> <span class="Constant">"new"</span><span class="Delimiter">)</span> << <span class="Constant">"routine allocated memory from "</span> << alloc << <span class="Constant">" to "</span> << alloc_max<span class="Delimiter">;</span>
<span class="SalientComment">//:: First handle 'type' operands.</span>
<span class="Delimiter">:(before "End Mu Types Initialization")</span>
Type_number[<span class="Constant">"type"</span>] = <span class="Constant">0</span><span class="Delimiter">;</span>
<span class="Delimiter">:(after "Per-recipe Transforms")</span>
<span class="Comment">// replace type names with type_numbers</span>
if <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>operation == Recipe_number[<span class="Constant">"new"</span>]<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span class="Comment">// End NEW Transform Special-cases</span>
<span class="Comment">// first arg must be of type 'type'</span>
assert<span class="Delimiter">(</span>SIZE<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">)</span> >= <span class="Constant">1</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><span class="Constant">0</span><span class="Delimiter">)))</span>
raise << <span class="Constant">"expected literal, got "</span> << inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>to_string<span class="Delimiter">()</span> << <span class="cSpecial">'\n'</span> << die<span class="Delimiter">();</span>
if <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>properties<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>second<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)</span> != <span class="Constant">"type"</span><span class="Delimiter">)</span>
raise << <span class="Constant">"tried to allocate non-type "</span> << inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>to_string<span class="Delimiter">()</span> << <span class="Constant">" in recipe "</span> << Recipe[r]<span class="Delimiter">.</span>name << <span class="cSpecial">'\n'</span> << die<span class="Delimiter">();</span>
if <span class="Delimiter">(</span>Type_number<span class="Delimiter">.</span>find<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>name<span class="Delimiter">)</span> == Type_number<span class="Delimiter">.</span>end<span class="Delimiter">())</span>
raise << <span class="Constant">"unknown type "</span> << inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>name << <span class="Constant">" in recipe "</span> << Recipe[r]<span class="Delimiter">.</span>name << <span class="cSpecial">'\n'</span> << die<span class="Delimiter">();</span>
<span class="CommentedCode">//? cerr << "type " << inst.ingredients.at(0).name << " => " << Type_number[inst.ingredients.at(0).name] << '\n'; //? 1</span>
inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>set_value<span class="Delimiter">(</span>Type_number[inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>name]<span class="Delimiter">);</span>
trace<span class="Delimiter">(</span>Primitive_recipe_depth<span class="Delimiter">,</span> <span class="Constant">"new"</span><span class="Delimiter">)</span> << inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>name << <span class="Constant">" -> "</span> << inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>name<span class="Delimiter">;</span>
end_new_transform:<span class="Delimiter">;</span>
<span class="Delimiter">}</span>
<span class="SalientComment">//:: Now implement the primitive recipe.</span>
<span class="Comment">//: todo: build 'new' in mu itself</span>
<span class="Delimiter">:(before "End Primitive Recipe Declarations")</span>
NEW<span class="Delimiter">,</span>
<span class="Delimiter">:(before "End Primitive Recipe Numbers")</span>
Recipe_number[<span class="Constant">"new"</span>] = NEW<span class="Delimiter">;</span>
<span class="Delimiter">:(before "End Primitive Recipe Implementations")</span>
case NEW: <span class="Delimiter">{</span>
<span class="Comment">// compute the space we need</span>
long long int size = <span class="Constant">0</span><span class="Delimiter">;</span>
long long int array_length = <span class="Constant">0</span><span class="Delimiter">;</span>
<span class="Delimiter">{</span>
vector<type_number> type<span class="Delimiter">;</span>
assert<span class="Delimiter">(</span>is_literal<span class="Delimiter">(</span>current_instruction<span class="Delimiter">().</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)));</span>
type<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>current_instruction<span class="Delimiter">().</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>value<span class="Delimiter">);</span>
<span class="CommentedCode">//? trace(Primitive_recipe_depth, "mem") << "type " << current_instruction().ingredients.at(0).to_string() << ' ' << type.size() << ' ' << type.back() << " has size " << size_of(type); //? 1</span>
if <span class="Delimiter">(</span>SIZE<span class="Delimiter">(</span>current_instruction<span class="Delimiter">().</span>ingredients<span class="Delimiter">)</span> > <span class="Constant">1</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span class="Comment">// array</span>
array_length = ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
trace<span class="Delimiter">(</span>Primitive_recipe_depth<span class="Delimiter">,</span> <span class="Constant">"mem"</span><span class="Delimiter">)</span> << <span class="Constant">"array size is "</span> << array_length<span class="Delimiter">;</span>
size = array_length*size_of<span class="Delimiter">(</span>type<span class="Delimiter">)</span> + <span class="Comment">/*</span><span class="Comment">space for length</span><span class="Comment">*/</span><span class="Constant">1</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
else <span class="Delimiter">{</span>
<span class="Comment">// scalar</span>
size = size_of<span class="Delimiter">(</span>type<span class="Delimiter">);</span>
<span class="Delimiter">}</span>
<span class="Delimiter">}</span>
<span class="Comment">// compute the region of memory to return</span>
<span class="Comment">// really crappy at the moment</span>
ensure_space<span class="Delimiter">(</span>size<span class="Delimiter">);</span>
const long long int result = Current_routine<span class="Delimiter">-></span>alloc<span class="Delimiter">;</span>
trace<span class="Delimiter">(</span>Primitive_recipe_depth<span class="Delimiter">,</span> <span class="Constant">"mem"</span><span class="Delimiter">)</span> << <span class="Constant">"new alloc: "</span> << result<span class="Delimiter">;</span>
<span class="CommentedCode">//? trace(Primitive_recipe_depth, "mem") << "size: " << size << " locations"; //? 1</span>
<span class="Comment">// save result</span>
products<span class="Delimiter">.</span>resize<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">);</span>
products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span>result<span class="Delimiter">);</span>
<span class="Comment">// initialize allocated space</span>
for <span class="Delimiter">(</span>long long int address = result<span class="Delimiter">;</span> address < result+size<span class="Delimiter">;</span> ++address<span class="Delimiter">)</span> <span class="Delimiter">{</span>
Memory[address] = <span class="Constant">0</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
if <span class="Delimiter">(</span>SIZE<span class="Delimiter">(</span>current_instruction<span class="Delimiter">().</span>ingredients<span class="Delimiter">)</span> > <span class="Constant">1</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
Memory[result] = array_length<span class="Delimiter">;</span>
<span class="Delimiter">}</span>
<span class="Comment">// bump</span>
Current_routine<span class="Delimiter">-></span>alloc += size<span class="Delimiter">;</span>
<span class="Comment">// no support for reclaiming memory</span>
assert<span class="Delimiter">(</span>Current_routine<span class="Delimiter">-></span>alloc <= Current_routine<span class="Delimiter">-></span>alloc_max<span class="Delimiter">);</span>
<span class="Identifier">break</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
<span class="Delimiter">:(code)</span>
void ensure_space<span class="Delimiter">(</span>long long int size<span class="Delimiter">)</span> <span class="Delimiter">{</span>
assert<span class="Delimiter">(</span>size <= Initial_memory_per_routine<span class="Delimiter">);</span>
<span class="CommentedCode">//? cout << Current_routine->alloc << " " << Current_routine->alloc_max << " " << size << '\n'; //? 1</span>
if <span class="Delimiter">(</span>Current_routine<span class="Delimiter">-></span>alloc + size > Current_routine<span class="Delimiter">-></span>alloc_max<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span class="Comment">// waste the remaining space and create a new chunk</span>
Current_routine<span class="Delimiter">-></span>alloc = Memory_allocated_until<span class="Delimiter">;</span>
Memory_allocated_until += Initial_memory_per_routine<span class="Delimiter">;</span>
Current_routine<span class="Delimiter">-></span>alloc_max = Memory_allocated_until<span class="Delimiter">;</span>
trace<span class="Delimiter">(</span>Primitive_recipe_depth<span class="Delimiter">,</span> <span class="Constant">"new"</span><span class="Delimiter">)</span> << <span class="Constant">"routine allocated memory from "</span> << Current_routine<span class="Delimiter">-></span>alloc << <span class="Constant">" to "</span> << Current_routine<span class="Delimiter">-></span>alloc_max<span class="Delimiter">;</span>
<span class="Delimiter">}</span>
<span class="Delimiter">}</span>
<span class="Delimiter">:(scenario new_initializes)</span>
<span class="Special">% Memory_allocated_until = 10;</span>
<span class="Special">% Memory[Memory_allocated_until] = 1;</span>
recipe main [
<span class="Constant">1</span>:address:number<span class="Special"> <- </span>new number:type
<span class="Constant">2</span>:number<span class="Special"> <- </span>copy <span class="Constant">1</span>:address:number/deref
]
<span class="traceContains">+mem: storing 0 in location 2</span>
<span class="Delimiter">:(scenario new_array)</span>
recipe main [
<span class="Constant">1</span>:address:array:number/<span class="Special">raw <- </span>new number:type<span class="Delimiter">,</span> <span class="Constant">5</span>:literal
<span class="Constant">2</span>:address:number/<span class="Special">raw <- </span>new number:type
<span class="Constant">3</span>:number/<span class="Special">raw <- </span>subtract <span class="Constant">2</span>:address:number/<span class="Special">raw</span><span class="Delimiter">,</span> <span class="Constant">1</span>:address:array:number/<span class="Special">raw</span>
]
<span class="traceContains">+run: 1:address:array:number/raw <- new number:type, 5:literal</span>
<span class="traceContains">+mem: array size is 5</span>
<span class="Comment"># don't forget the extra location for array size</span>
<span class="traceContains">+mem: storing 6 in location 3</span>
<span class="Delimiter">:(scenario new_empty_array)</span>
recipe main [
<span class="Constant">1</span>:address:array:number/<span class="Special">raw <- </span>new number:type<span class="Delimiter">,</span> <span class="Constant">0</span>:literal
<span class="Constant">2</span>:address:number/<span class="Special">raw <- </span>new number:type
<span class="Constant">3</span>:number/<span class="Special">raw <- </span>subtract <span class="Constant">2</span>:address:number/<span class="Special">raw</span><span class="Delimiter">,</span> <span class="Constant">1</span>:address:array:number/<span class="Special">raw</span>
]
<span class="traceContains">+run: 1:address:array:number/raw <- new number:type, 0:literal</span>
<span class="traceContains">+mem: array size is 0</span>
<span class="traceContains">+mem: storing 1 in location 3</span>
<span class="Comment">//: Make sure that each routine gets a different alloc to start.</span>
<span class="Delimiter">:(scenario new_concurrent)</span>
recipe f1 [
start-running f2:recipe
<span class="Constant">1</span>:address:number/<span class="Special">raw <- </span>new number:type
<span class="Comment"># wait for f2 to complete</span>
<span class="Delimiter">{</span>
loop-unless <span class="Constant">4</span>:number/<span class="Special">raw</span>
<span class="Delimiter">}</span>
]
recipe f2 [
<span class="Constant">2</span>:address:number/<span class="Special">raw <- </span>new number:type
<span class="Comment"># hack: assumes scheduler implementation</span>
<span class="Constant">3</span>:boolean/<span class="Special">raw <- </span>equal <span class="Constant">1</span>:address:number/<span class="Special">raw</span><span class="Delimiter">,</span> <span class="Constant">2</span>:address:number/<span class="Special">raw</span>
<span class="Comment"># signal f2 complete</span>
<span class="Constant">4</span>:number/<span class="Special">raw <- </span>copy <span class="Constant">1</span>:literal
]
<span class="traceContains">+mem: storing 0 in location 3</span>
<span class="Comment">//: If a routine runs out of its initial allocation, it should allocate more.</span>
<span class="Delimiter">:(scenario new_overflow)</span>
<span class="Special">% Initial_memory_per_routine = 2;</span>
recipe main [
<span class="Constant">1</span>:address:number/<span class="Special">raw <- </span>new number:type
<span class="Constant">2</span>:address:point/<span class="Special">raw <- </span>new point:type <span class="Comment"># not enough room in initial page</span>
]
<span class="traceContains">+new: routine allocated memory from 1000 to 1002</span>
<span class="traceContains">+new: routine allocated memory from 1002 to 1004</span>
<span class="SalientComment">//:: Next, extend 'new' to handle a unicode string literal argument.</span>
<span class="Delimiter">:(scenario new_string)</span>
recipe main [
<span class="Constant">1</span>:address:array:character<span class="Special"> <- </span>new [abc def]
<span class="Constant">2</span>:character<span class="Special"> <- </span>index <span class="Constant">1</span>:address:array:character/deref<span class="Delimiter">,</span> <span class="Constant">5</span>:literal
]
<span class="Comment"># number code for 'e'</span>
<span class="traceContains">+mem: storing 101 in location 2</span>
<span class="Delimiter">:(scenario new_string_handles_unicode)</span>
recipe main [
<span class="Constant">1</span>:address:array:character<span class="Special"> <- </span>new [a«c]
<span class="Constant">2</span>:number<span class="Special"> <- </span>length <span class="Constant">1</span>:address:array:character/deref
<span class="Constant">3</span>:character<span class="Special"> <- </span>index <span class="Constant">1</span>:address:array:character/deref<span class="Delimiter">,</span> <span class="Constant">1</span>:literal
]
<span class="traceContains">+mem: storing 3 in location 2</span>
<span class="Comment"># unicode for '«'</span>
<span class="traceContains">+mem: storing 171 in location 3</span>
<span class="Delimiter">:(before "End NEW Transform Special-cases")</span>
if <span class="Delimiter">(</span>!inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>empty<span class="Delimiter">()</span>
&& !inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>properties<span class="Delimiter">.</span>empty<span class="Delimiter">()</span>
&& !inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>properties<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>second<span class="Delimiter">.</span>empty<span class="Delimiter">()</span>
&& inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>properties<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>second<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)</span> == <span class="Constant">"literal-string"</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span class="Comment">// skip transform</span>
inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>initialized = <span class="Constant">true</span><span class="Delimiter">;</span>
<span class="Identifier">goto</span> end_new_transform<span class="Delimiter">;</span>
<span class="Delimiter">}</span>
<span class="Delimiter">:(after "case NEW" following "Primitive Recipe Implementations")</span>
if <span class="Delimiter">(</span>is_literal<span class="Delimiter">(</span>current_instruction<span class="Delimiter">().</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">))</span>
&& current_instruction<span class="Delimiter">().</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>properties<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>second<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)</span> == <span class="Constant">"literal-string"</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span class="Comment">// allocate an array just large enough for it</span>
long long int string_length = unicode_length<span class="Delimiter">(</span>current_instruction<span class="Delimiter">().</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>name<span class="Delimiter">);</span>
<span class="CommentedCode">//? cout << "string_length is " << string_length << '\n'; //? 1</span>
ensure_space<span class="Delimiter">(</span>string_length+<span class="Constant">1</span><span class="Delimiter">);</span> <span class="Comment">// don't forget the extra location for array size</span>
products<span class="Delimiter">.</span>resize<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">);</span>
products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span>Current_routine<span class="Delimiter">-></span>alloc<span class="Delimiter">);</span>
<span class="Comment">// initialize string</span>
<span class="CommentedCode">//? cout << "new string literal: " << current_instruction().ingredients.at(0).name << '\n'; //? 1</span>
Memory[Current_routine<span class="Delimiter">-></span>alloc++] = string_length<span class="Delimiter">;</span>
long long int curr = <span class="Constant">0</span><span class="Delimiter">;</span>
const string& contents = current_instruction<span class="Delimiter">().</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>name<span class="Delimiter">;</span>
const char* raw_contents = contents<span class="Delimiter">.</span>c_str<span class="Delimiter">();</span>
for <span class="Delimiter">(</span>long long int i = <span class="Constant">0</span><span class="Delimiter">;</span> i < string_length<span class="Delimiter">;</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
uint32_t curr_character<span class="Delimiter">;</span>
assert<span class="Delimiter">(</span>curr < SIZE<span class="Delimiter">(</span>contents<span class="Delimiter">));</span>
tb_utf8_char_to_unicode<span class="Delimiter">(</span>&curr_character<span class="Delimiter">,</span> &raw_contents[curr]<span class="Delimiter">);</span>
Memory[Current_routine<span class="Delimiter">-></span>alloc] = curr_character<span class="Delimiter">;</span>
curr += tb_utf8_char_length<span class="Delimiter">(</span>raw_contents[curr]<span class="Delimiter">);</span>
++Current_routine<span class="Delimiter">-></span>alloc<span class="Delimiter">;</span>
<span class="Delimiter">}</span>
<span class="Comment">// mu strings are not null-terminated in memory</span>
<span class="Identifier">break</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
<span class="Comment">//: Allocate more to routine when initializing a literal string</span>
<span class="Delimiter">:(scenario new_string_overflow)</span>
<span class="Special">% Initial_memory_per_routine = 2;</span>
recipe main [
<span class="Constant">1</span>:address:number/<span class="Special">raw <- </span>new number:type
<span class="Constant">2</span>:address:array:character/<span class="Special">raw <- </span>new [a] <span class="Comment"># not enough room in initial page, if you take the array size into account</span>
]
<span class="traceContains">+new: routine allocated memory from 1000 to 1002</span>
<span class="traceContains">+new: routine allocated memory from 1002 to 1004</span>
<span class="Comment">//: helpers</span>
<span class="Delimiter">:(code)</span>
long long int unicode_length<span class="Delimiter">(</span>const string& s<span class="Delimiter">)</span> <span class="Delimiter">{</span>
const char* in = s<span class="Delimiter">.</span>c_str<span class="Delimiter">();</span>
long long int result = <span class="Constant">0</span><span class="Delimiter">;</span>
long long int curr = <span class="Constant">0</span><span class="Delimiter">;</span>
while <span class="Delimiter">(</span>curr < SIZE<span class="Delimiter">(</span>s<span class="Delimiter">))</span> <span class="Delimiter">{</span> <span class="Comment">// carefully bounds-check on the string</span>
<span class="Comment">// before accessing its raw pointer</span>
++result<span class="Delimiter">;</span>
curr += tb_utf8_char_length<span class="Delimiter">(</span>in[curr]<span class="Delimiter">);</span>
<span class="Delimiter">}</span>
<span class="Identifier">return</span> result<span class="Delimiter">;</span>
<span class="Delimiter">}</span>
</pre>
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