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<title>Mu - subx/034compute_segment_address.cc</title>
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<a href='https://github.com/akkartik/mu/blob/master/subx/034compute_segment_address.cc'>https://github.com/akkartik/mu/blob/master/subx/034compute_segment_address.cc</a>
<pre id='vimCodeElement'>
<span id="L1" class="LineNr"> 1 </span><span class="Comment">//: Start allowing us to not specify precise addresses for the start of each</span>
<span id="L2" class="LineNr"> 2 </span><span class="Comment">//: segment.</span>
<span id="L3" class="LineNr"> 3 </span><span class="Comment">//: This gives up a measure of control in placing code and data.</span>
<span id="L4" class="LineNr"> 4 </span>
<span id="L5" class="LineNr"> 5 </span><span class="Normal">void</span> <a href='034compute_segment_address.cc.html#L5'>test_segment_name</a><span class="Delimiter">()</span> <span class="Delimiter">{</span>
<span id="L6" class="LineNr"> 6 </span> <a href='011run.cc.html#L86'>run</a><span class="Delimiter">(</span>
<span id="L7" class="LineNr"> 7 </span> <span class="Constant">"== code\n"</span>
<span id="L8" class="LineNr"> 8 </span> <span class="Constant">"05/add-to-EAX 0x0d0c0b0a/imm32\n"</span>
<span id="L9" class="LineNr"> 9 </span> <span class="Comment">// code starts at 0x08048000 + p_offset, which is 0x54 for a single-segment binary</span>
<span id="L10" class="LineNr"> 10 </span> <span class="Delimiter">);</span>
<span id="L11" class="LineNr"> 11 </span> <a href='003trace.cc.html#L266'>CHECK_TRACE_CONTENTS</a><span class="Delimiter">(</span>
<span id="L12" class="LineNr"> 12 </span> <span class="Constant">"load: 0x09000054 -> 05\n"</span>
<span id="L13" class="LineNr"> 13 </span> <span class="Constant">"load: 0x09000055 -> 0a\n"</span>
<span id="L14" class="LineNr"> 14 </span> <span class="Constant">"load: 0x09000056 -> 0b\n"</span>
<span id="L15" class="LineNr"> 15 </span> <span class="Constant">"load: 0x09000057 -> 0c\n"</span>
<span id="L16" class="LineNr"> 16 </span> <span class="Constant">"load: 0x09000058 -> 0d\n"</span>
<span id="L17" class="LineNr"> 17 </span> <span class="Constant">"run: add <a href='037heap.cc.html#L23'>imm32</a> 0x0d0c0b0a to <a href='010---vm.cc.html#L23'>reg</a> EAX\n"</span>
<span id="L18" class="LineNr"> 18 </span> <span class="Constant">"run: storing 0x0d0c0b0a\n"</span>
<span id="L19" class="LineNr"> 19 </span> <span class="Delimiter">);</span>
<span id="L20" class="LineNr"> 20 </span><span class="Delimiter">}</span>
<span id="L21" class="LineNr"> 21 </span>
<span id="L22" class="LineNr"> 22 </span><span class="Comment">//: Update the parser to handle non-numeric segment name.</span>
<span id="L23" class="LineNr"> 23 </span><span class="Comment">//:</span>
<span id="L24" class="LineNr"> 24 </span><span class="Comment">//: We'll also support repeated segments with non-numeric names.</span>
<span id="L25" class="LineNr"> 25 </span>
<span id="L26" class="LineNr"> 26 </span><span class="Delimiter">:(before "End Globals")</span>
<span id="L27" class="LineNr"> 27 </span>map<<span class="Comment">/*</span><span class="Comment">name</span><span class="Comment">*/</span>string<span class="Delimiter">,</span> <span class="Normal">int</span>> <span class="Special"><a href='034compute_segment_address.cc.html#L27'>Segment_index</a></span><span class="Delimiter">;</span>
<span id="L28" class="LineNr"> 28 </span><span class="Normal">bool</span> <span class="Special"><a href='034compute_segment_address.cc.html#L28'>Currently_parsing_named_segment</a></span> = <span class="Constant">false</span><span class="Delimiter">;</span> <span class="Comment">// global to permit cross-layer communication</span>
<span id="L29" class="LineNr"> 29 </span><span class="Normal">int</span> <span class="Special"><a href='034compute_segment_address.cc.html#L29'>Currently_parsing_segment_index</a></span> = -<span class="Constant">1</span><span class="Delimiter">;</span> <span class="Comment">// global to permit cross-layer communication</span>
<span id="L30" class="LineNr"> 30 </span><span class="Delimiter">:(before "End Reset")</span>
<span id="L31" class="LineNr"> 31 </span><span class="Special"><a href='034compute_segment_address.cc.html#L27'>Segment_index</a></span><span class="Delimiter">.</span>clear<span class="Delimiter">();</span>
<span id="L32" class="LineNr"> 32 </span><span class="Special"><a href='034compute_segment_address.cc.html#L28'>Currently_parsing_named_segment</a></span> = <span class="Constant">false</span><span class="Delimiter">;</span>
<span id="L33" class="LineNr"> 33 </span><span class="Special"><a href='034compute_segment_address.cc.html#L29'>Currently_parsing_segment_index</a></span> = -<span class="Constant">1</span><span class="Delimiter">;</span>
<span id="L34" class="LineNr"> 34 </span>
<span id="L35" class="LineNr"> 35 </span><span class="Delimiter">:(before "End Segment Parsing Special-cases(segment_title)")</span>
<span id="L36" class="LineNr"> 36 </span><span class="Normal">if</span> <span class="Delimiter">(</span>!starts_with<span class="Delimiter">(</span>segment_title<span class="Delimiter">,</span> <span class="Constant">"0x"</span><span class="Delimiter">))</span> <span class="Delimiter">{</span>
<span id="L37" class="LineNr"> 37 </span> <span class="Special"><a href='034compute_segment_address.cc.html#L28'>Currently_parsing_named_segment</a></span> = <span class="Constant">true</span><span class="Delimiter">;</span>
<span id="L38" class="LineNr"> 38 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>!contains_key<span class="Delimiter">(</span><span class="Special"><a href='034compute_segment_address.cc.html#L27'>Segment_index</a></span><span class="Delimiter">,</span> segment_title<span class="Delimiter">))</span> <span class="Delimiter">{</span>
<span id="L39" class="LineNr"> 39 </span> <a href='003trace.cc.html#L96'>trace</a><span class="Delimiter">(</span><span class="Constant">3</span><span class="Delimiter">,</span> <span class="Constant">"parse"</span><span class="Delimiter">)</span> << <span class="Constant">"new segment '"</span> << segment_title << <span class="Constant">"'"</span> << end<span class="Delimiter">();</span>
<span id="L40" class="LineNr"> 40 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>out<span class="Delimiter">.</span><a href='011run.cc.html#L103'>segments</a><span class="Delimiter">.</span>empty<span class="Delimiter">()</span> && segment_title != <span class="Constant">"code"</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L41" class="LineNr"> 41 </span> <a href='003trace.cc.html#L202'>raise</a> << <span class="Constant">"first segment must be 'code' but is '"</span> << segment_title << <span class="Constant">"'\n"</span> << end<span class="Delimiter">();</span>
<span id="L42" class="LineNr"> 42 </span> <span class="Identifier">return</span><span class="Delimiter">;</span>
<span id="L43" class="LineNr"> 43 </span> <span class="Delimiter">}</span>
<span id="L44" class="LineNr"> 44 </span> <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L166'>SIZE</a><span class="Delimiter">(</span>out<span class="Delimiter">.</span><a href='011run.cc.html#L103'>segments</a><span class="Delimiter">)</span> == <span class="Constant">1</span> && segment_title != <span class="Constant">"data"</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L45" class="LineNr"> 45 </span> <a href='003trace.cc.html#L202'>raise</a> << <span class="Constant">"second segment must be 'data' but is '"</span> << segment_title << <span class="Constant">"'\n"</span> << end<span class="Delimiter">();</span>
<span id="L46" class="LineNr"> 46 </span> <span class="Identifier">return</span><span class="Delimiter">;</span>
<span id="L47" class="LineNr"> 47 </span> <span class="Delimiter">}</span>
<span id="L48" class="LineNr"> 48 </span> <a href='001help.cc.html#L252'>put</a><span class="Delimiter">(</span><span class="Special"><a href='034compute_segment_address.cc.html#L27'>Segment_index</a></span><span class="Delimiter">,</span> segment_title<span class="Delimiter">,</span> <a href='001help.cc.html#L166'>SIZE</a><span class="Delimiter">(</span>out<span class="Delimiter">.</span><a href='011run.cc.html#L103'>segments</a><span class="Delimiter">));</span>
<span id="L49" class="LineNr"> 49 </span> out<span class="Delimiter">.</span><a href='011run.cc.html#L103'>segments</a><span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>segment<span class="Delimiter">());</span>
<span id="L50" class="LineNr"> 50 </span> <span class="Delimiter">}</span>
<span id="L51" class="LineNr"> 51 </span> <span class="Normal">else</span> <span class="Delimiter">{</span>
<span id="L52" class="LineNr"> 52 </span> <a href='003trace.cc.html#L96'>trace</a><span class="Delimiter">(</span><span class="Constant">3</span><span class="Delimiter">,</span> <span class="Constant">"parse"</span><span class="Delimiter">)</span> << <span class="Constant">"appending to segment '"</span> << segment_title << <span class="Constant">"'"</span> << end<span class="Delimiter">();</span>
<span id="L53" class="LineNr"> 53 </span> <span class="Delimiter">}</span>
<span id="L54" class="LineNr"> 54 </span> <span class="Special"><a href='034compute_segment_address.cc.html#L29'>Currently_parsing_segment_index</a></span> = get<span class="Delimiter">(</span><span class="Special"><a href='034compute_segment_address.cc.html#L27'>Segment_index</a></span><span class="Delimiter">,</span> segment_title<span class="Delimiter">);</span>
<span id="L55" class="LineNr"> 55 </span><span class="Delimiter">}</span>
<span id="L56" class="LineNr"> 56 </span>
<span id="L57" class="LineNr"> 57 </span><span class="Delimiter">:(before "End flush(p, lines) Special-cases")</span>
<span id="L58" class="LineNr"> 58 </span><span class="Normal">if</span> <span class="Delimiter">(</span><span class="Special"><a href='034compute_segment_address.cc.html#L28'>Currently_parsing_named_segment</a></span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L59" class="LineNr"> 59 </span> assert<span class="Delimiter">(</span>!p<span class="Delimiter">.</span><a href='011run.cc.html#L103'>segments</a><span class="Delimiter">.</span>empty<span class="Delimiter">());</span>
<span id="L60" class="LineNr"> 60 </span> <a href='003trace.cc.html#L96'>trace</a><span class="Delimiter">(</span><span class="Constant">3</span><span class="Delimiter">,</span> <span class="Constant">"parse"</span><span class="Delimiter">)</span> << <span class="Constant">"flushing segment"</span> << end<span class="Delimiter">();</span>
<span id="L61" class="LineNr"> 61 </span> vector<line>& curr_segment_data = p<span class="Delimiter">.</span><a href='011run.cc.html#L103'>segments</a><span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Special"><a href='034compute_segment_address.cc.html#L29'>Currently_parsing_segment_index</a></span><span class="Delimiter">).</span><a href='011run.cc.html#L112'>lines</a><span class="Delimiter">;</span>
<span id="L62" class="LineNr"> 62 </span> curr_segment_data<span class="Delimiter">.</span>insert<span class="Delimiter">(</span>curr_segment_data<span class="Delimiter">.</span>end<span class="Delimiter">(),</span> <a href='011run.cc.html#L112'>lines</a><span class="Delimiter">.</span>begin<span class="Delimiter">(),</span> <a href='011run.cc.html#L112'>lines</a><span class="Delimiter">.</span>end<span class="Delimiter">());</span>
<span id="L63" class="LineNr"> 63 </span> <a href='011run.cc.html#L112'>lines</a><span class="Delimiter">.</span>clear<span class="Delimiter">();</span>
<span id="L64" class="LineNr"> 64 </span> <span class="Special"><a href='034compute_segment_address.cc.html#L28'>Currently_parsing_named_segment</a></span> = <span class="Constant">false</span><span class="Delimiter">;</span>
<span id="L65" class="LineNr"> 65 </span> <span class="Special"><a href='034compute_segment_address.cc.html#L29'>Currently_parsing_segment_index</a></span> = -<span class="Constant">1</span><span class="Delimiter">;</span>
<span id="L66" class="LineNr"> 66 </span> <span class="Identifier">return</span><span class="Delimiter">;</span>
<span id="L67" class="LineNr"> 67 </span><span class="Delimiter">}</span>
<span id="L68" class="LineNr"> 68 </span>
<span id="L69" class="LineNr"> 69 </span><span class="Delimiter">:(code)</span>
<span id="L70" class="LineNr"> 70 </span><span class="Normal">void</span> <a href='034compute_segment_address.cc.html#L70'>test_repeated_segment_merges_data</a><span class="Delimiter">()</span> <span class="Delimiter">{</span>
<span id="L71" class="LineNr"> 71 </span> <a href='011run.cc.html#L86'>run</a><span class="Delimiter">(</span>
<span id="L72" class="LineNr"> 72 </span> <span class="Constant">"== code\n"</span>
<span id="L73" class="LineNr"> 73 </span> <span class="Constant">"05/add-to-EAX 0x0d0c0b0a/imm32\n"</span>
<span id="L74" class="LineNr"> 74 </span> <span class="Constant">"== code\n"</span> <span class="Comment">// again</span>
<span id="L75" class="LineNr"> 75 </span> <span class="Constant">"2d/subtract-from-EAX 0xddccbbaa/imm32\n"</span>
<span id="L76" class="LineNr"> 76 </span> <span class="Delimiter">);</span>
<span id="L77" class="LineNr"> 77 </span> <a href='003trace.cc.html#L266'>CHECK_TRACE_CONTENTS</a><span class="Delimiter">(</span>
<span id="L78" class="LineNr"> 78 </span> <span class="Constant">"parse: new segment 'code'\n"</span>
<span id="L79" class="LineNr"> 79 </span> <span class="Constant">"parse: appending to segment 'code'\n"</span>
<span id="L80" class="LineNr"> 80 </span> <span class="Comment">// first segment</span>
<span id="L81" class="LineNr"> 81 </span> <span class="Constant">"load: 0x09000054 -> 05\n"</span>
<span id="L82" class="LineNr"> 82 </span> <span class="Constant">"load: 0x09000055 -> 0a\n"</span>
<span id="L83" class="LineNr"> 83 </span> <span class="Constant">"load: 0x09000056 -> 0b\n"</span>
<span id="L84" class="LineNr"> 84 </span> <span class="Constant">"load: 0x09000057 -> 0c\n"</span>
<span id="L85" class="LineNr"> 85 </span> <span class="Constant">"load: 0x09000058 -> 0d\n"</span>
<span id="L86" class="LineNr"> 86 </span> <span class="Comment">// second segment</span>
<span id="L87" class="LineNr"> 87 </span> <span class="Constant">"load: 0x09000059 -> 2d\n"</span>
<span id="L88" class="LineNr"> 88 </span> <span class="Constant">"load: 0x0900005a -> aa\n"</span>
<span id="L89" class="LineNr"> 89 </span> <span class="Constant">"load: 0x0900005b -> bb\n"</span>
<span id="L90" class="LineNr"> 90 </span> <span class="Constant">"load: 0x0900005c -> cc\n"</span>
<span id="L91" class="LineNr"> 91 </span> <span class="Constant">"load: 0x0900005d -> dd\n"</span>
<span id="L92" class="LineNr"> 92 </span> <span class="Delimiter">);</span>
<span id="L93" class="LineNr"> 93 </span><span class="Delimiter">}</span>
<span id="L94" class="LineNr"> 94 </span>
<span id="L95" class="LineNr"> 95 </span><span class="Normal">void</span> <a href='034compute_segment_address.cc.html#L95'>test_error_on_missing_segment_header</a><span class="Delimiter">()</span> <span class="Delimiter">{</span>
<span id="L96" class="LineNr"> 96 </span> <span class="Special">Hide_errors</span> = <span class="Constant">true</span><span class="Delimiter">;</span>
<span id="L97" class="LineNr"> 97 </span> <a href='011run.cc.html#L86'>run</a><span class="Delimiter">(</span>
<span id="L98" class="LineNr"> 98 </span> <span class="Constant">"05/add-to-EAX 0/imm32\n"</span>
<span id="L99" class="LineNr"> 99 </span> <span class="Delimiter">);</span>
<span id="L100" class="LineNr">100 </span> <a href='003trace.cc.html#L266'>CHECK_TRACE_CONTENTS</a><span class="Delimiter">(</span>
<span id="L101" class="LineNr">101 </span> <span class="Constant">"error: input does not start with a '==' section header\n"</span>
<span id="L102" class="LineNr">102 </span> <span class="Delimiter">);</span>
<span id="L103" class="LineNr">103 </span><span class="Delimiter">}</span>
<span id="L104" class="LineNr">104 </span>
<span id="L105" class="LineNr">105 </span><span class="Normal">void</span> <a href='034compute_segment_address.cc.html#L105'>test_error_on_first_segment_not_code</a><span class="Delimiter">()</span> <span class="Delimiter">{</span>
<span id="L106" class="LineNr">106 </span> <span class="Special">Hide_errors</span> = <span class="Constant">true</span><span class="Delimiter">;</span>
<span id="L107" class="LineNr">107 </span> <a href='011run.cc.html#L86'>run</a><span class="Delimiter">(</span>
<span id="L108" class="LineNr">108 </span> <span class="Constant">"== data\n"</span>
<span id="L109" class="LineNr">109 </span> <span class="Constant">"05 00 00 00 00\n"</span>
<span id="L110" class="LineNr">110 </span> <span class="Delimiter">);</span>
<span id="L111" class="LineNr">111 </span> <a href='003trace.cc.html#L266'>CHECK_TRACE_CONTENTS</a><span class="Delimiter">(</span>
<span id="L112" class="LineNr">112 </span> <span class="Constant">"error: first segment must be 'code' but is 'data'\n"</span>
<span id="L113" class="LineNr">113 </span> <span class="Delimiter">);</span>
<span id="L114" class="LineNr">114 </span><span class="Delimiter">}</span>
<span id="L115" class="LineNr">115 </span>
<span id="L116" class="LineNr">116 </span><span class="Normal">void</span> <a href='034compute_segment_address.cc.html#L116'>test_error_on_second_segment_not_data</a><span class="Delimiter">()</span> <span class="Delimiter">{</span>
<span id="L117" class="LineNr">117 </span> <span class="Special">Hide_errors</span> = <span class="Constant">true</span><span class="Delimiter">;</span>
<span id="L118" class="LineNr">118 </span> <a href='011run.cc.html#L86'>run</a><span class="Delimiter">(</span>
<span id="L119" class="LineNr">119 </span> <span class="Constant">"== code\n"</span>
<span id="L120" class="LineNr">120 </span> <span class="Constant">"05/add-to-EAX 0/imm32\n"</span>
<span id="L121" class="LineNr">121 </span> <span class="Constant">"== bss\n"</span>
<span id="L122" class="LineNr">122 </span> <span class="Constant">"05 00 00 00 00\n"</span>
<span id="L123" class="LineNr">123 </span> <span class="Delimiter">);</span>
<span id="L124" class="LineNr">124 </span> <a href='003trace.cc.html#L266'>CHECK_TRACE_CONTENTS</a><span class="Delimiter">(</span>
<span id="L125" class="LineNr">125 </span> <span class="Constant">"error: second segment must be 'data' but is 'bss'\n"</span>
<span id="L126" class="LineNr">126 </span> <span class="Delimiter">);</span>
<span id="L127" class="LineNr">127 </span><span class="Delimiter">}</span>
<span id="L128" class="LineNr">128 </span>
<span id="L129" class="LineNr">129 </span><span class="Comment">//: compute segment address</span>
<span id="L130" class="LineNr">130 </span>
<span id="L131" class="LineNr">131 </span><span class="Delimiter">:(before "End Level-2 Transforms")</span>
<span id="L132" class="LineNr">132 </span><span class="Special"><a href='011run.cc.html#L235'>Transform</a></span><span class="Delimiter">.</span>push_back<span class="Delimiter">(</span><a href='034compute_segment_address.cc.html#L135'>compute_segment_starts</a><span class="Delimiter">);</span>
<span id="L133" class="LineNr">133 </span>
<span id="L134" class="LineNr">134 </span><span class="Delimiter">:(code)</span>
<span id="L135" class="LineNr">135 </span><span class="Normal">void</span> <a href='034compute_segment_address.cc.html#L135'>compute_segment_starts</a><span class="Delimiter">(</span>program& p<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L136" class="LineNr">136 </span> <a href='003trace.cc.html#L96'>trace</a><span class="Delimiter">(</span><span class="Constant">3</span><span class="Delimiter">,</span> <span class="Constant">"transform"</span><span class="Delimiter">)</span> << <span class="Constant">"-- compute segment addresses"</span> << end<span class="Delimiter">();</span>
<span id="L137" class="LineNr">137 </span> <span class="Normal">uint32_t</span> p_offset = <span class="Comment">/*</span><span class="Comment">size of ehdr</span><span class="Comment">*/</span><span class="Constant">0x34</span> + <a href='001help.cc.html#L166'>SIZE</a><span class="Delimiter">(</span>p<span class="Delimiter">.</span><a href='011run.cc.html#L103'>segments</a><span class="Delimiter">)</span>*<span class="Constant">0x20</span><span class="Comment">/*</span><span class="Comment">size of each phdr</span><span class="Comment">*/</span><span class="Delimiter">;</span>
<span id="L138" class="LineNr">138 </span> <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">size_t</span> i = <span class="Constant">0</span><span class="Delimiter">;</span> i < p<span class="Delimiter">.</span><a href='011run.cc.html#L103'>segments</a><span class="Delimiter">.</span>size<span class="Delimiter">();</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L139" class="LineNr">139 </span> segment& curr = p<span class="Delimiter">.</span><a href='011run.cc.html#L103'>segments</a><span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
<span id="L140" class="LineNr">140 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>curr<span class="Delimiter">.</span>start == <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L141" class="LineNr">141 </span> curr<span class="Delimiter">.</span>start = <a href='012elf.cc.html#L136'>CODE_SEGMENT</a> + i*SPACE_FOR_SEGMENT + p_offset<span class="Delimiter">;</span>
<span id="L142" class="LineNr">142 </span> <a href='003trace.cc.html#L96'>trace</a><span class="Delimiter">(</span><span class="Constant">99</span><span class="Delimiter">,</span> <span class="Constant">"transform"</span><span class="Delimiter">)</span> << <span class="Constant">"segment "</span> << i << <span class="Constant">" begins at address 0x"</span> << <a href='010---vm.cc.html#L440'>HEXWORD</a> << curr<span class="Delimiter">.</span>start << end<span class="Delimiter">();</span>
<span id="L143" class="LineNr">143 </span> <span class="Delimiter">}</span>
<span id="L144" class="LineNr">144 </span> p_offset += size_of<span class="Delimiter">(</span>curr<span class="Delimiter">);</span>
<span id="L145" class="LineNr">145 </span> assert<span class="Delimiter">(</span>p_offset < <a href='010---vm.cc.html#L115'>SEGMENT_ALIGNMENT</a><span class="Delimiter">);</span> <span class="Comment">// for now we get less and less available space in each successive segment</span>
<span id="L146" class="LineNr">146 </span> <span class="Delimiter">}</span>
<span id="L147" class="LineNr">147 </span><span class="Delimiter">}</span>
<span id="L148" class="LineNr">148 </span>
<span id="L149" class="LineNr">149 </span><span class="Normal">uint32_t</span> size_of<span class="Delimiter">(</span><span class="Normal">const</span> segment& s<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L150" class="LineNr">150 </span> <span class="Normal">uint32_t</span> sum = <span class="Constant">0</span><span class="Delimiter">;</span>
<span id="L151" class="LineNr">151 </span> <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span> i < <a href='001help.cc.html#L166'>SIZE</a><span class="Delimiter">(</span>s<span class="Delimiter">.</span><a href='011run.cc.html#L112'>lines</a><span class="Delimiter">);</span> ++i<span class="Delimiter">)</span>
<span id="L152" class="LineNr">152 </span> sum += <a href='034compute_segment_address.cc.html#L157'>num_bytes</a><span class="Delimiter">(</span>s<span class="Delimiter">.</span><a href='011run.cc.html#L112'>lines</a><span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">));</span>
<span id="L153" class="LineNr">153 </span> <span class="Identifier">return</span> sum<span class="Delimiter">;</span>
<span id="L154" class="LineNr">154 </span><span class="Delimiter">}</span>
<span id="L155" class="LineNr">155 </span>
<span id="L156" class="LineNr">156 </span><span class="Comment">// Assumes all bitfields are packed.</span>
<span id="L157" class="LineNr">157 </span><span class="Normal">uint32_t</span> <a href='034compute_segment_address.cc.html#L157'>num_bytes</a><span class="Delimiter">(</span><span class="Normal">const</span> line& inst<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L158" class="LineNr">158 </span> <span class="Normal">uint32_t</span> sum = <span class="Constant">0</span><span class="Delimiter">;</span>
<span id="L159" class="LineNr">159 </span> <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span> i < <a href='001help.cc.html#L166'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span><a href='011run.cc.html#L121'>words</a><span class="Delimiter">);</span> ++i<span class="Delimiter">)</span>
<span id="L160" class="LineNr">160 </span> sum += size_of<span class="Delimiter">(</span>inst<span class="Delimiter">.</span><a href='011run.cc.html#L121'>words</a><span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">));</span>
<span id="L161" class="LineNr">161 </span> <span class="Identifier">return</span> sum<span class="Delimiter">;</span>
<span id="L162" class="LineNr">162 </span><span class="Delimiter">}</span>
<span id="L163" class="LineNr">163 </span>
<span id="L164" class="LineNr">164 </span><span class="Normal">int</span> size_of<span class="Delimiter">(</span><span class="Normal">const</span> word& w<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L165" class="LineNr">165 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>has_operand_metadata<span class="Delimiter">(</span>w<span class="Delimiter">,</span> <span class="Constant">"disp32"</span><span class="Delimiter">)</span> || has_operand_metadata<span class="Delimiter">(</span>w<span class="Delimiter">,</span> <span class="Constant">"imm32"</span><span class="Delimiter">))</span>
<span id="L166" class="LineNr">166 </span> <span class="Identifier">return</span> <span class="Constant">4</span><span class="Delimiter">;</span>
<span id="L167" class="LineNr">167 </span> <span class="Normal">else</span> <span class="Normal">if</span> <span class="Delimiter">(</span>has_operand_metadata<span class="Delimiter">(</span>w<span class="Delimiter">,</span> <span class="Constant">"disp16"</span><span class="Delimiter">))</span>
<span id="L168" class="LineNr">168 </span> <span class="Identifier">return</span> <span class="Constant">2</span><span class="Delimiter">;</span>
<span id="L169" class="LineNr">169 </span> <span class="Comment">// End size_of(word w) Special-cases</span>
<span id="L170" class="LineNr">170 </span> <span class="Normal">else</span>
<span id="L171" class="LineNr">171 </span> <span class="Identifier">return</span> <span class="Constant">1</span><span class="Delimiter">;</span>
<span id="L172" class="LineNr">172 </span><span class="Delimiter">}</span>
<span id="L173" class="LineNr">173 </span>
<span id="L174" class="LineNr">174 </span><span class="Comment">//: Dependencies:</span>
<span id="L175" class="LineNr">175 </span><span class="Comment">//: - We'd like to compute segment addresses before setting up global variables,</span>
<span id="L176" class="LineNr">176 </span><span class="Comment">//: because computing addresses for global variables requires knowing where</span>
<span id="L177" class="LineNr">177 </span><span class="Comment">//: the data segment starts.</span>
<span id="L178" class="LineNr">178 </span><span class="Comment">//: - We'd like to finish expanding labels before computing segment addresses,</span>
<span id="L179" class="LineNr">179 </span><span class="Comment">//: because it would make computing the sizes of segments more self-contained</span>
<span id="L180" class="LineNr">180 </span><span class="Comment">//: (num_bytes).</span>
<span id="L181" class="LineNr">181 </span><span class="Comment">//:</span>
<span id="L182" class="LineNr">182 </span><span class="Comment">//: Decision: compute segment addresses before expanding labels, by being</span>
<span id="L183" class="LineNr">183 </span><span class="Comment">//: aware in this layer of certain operand types that will eventually occupy</span>
<span id="L184" class="LineNr">184 </span><span class="Comment">//: multiple bytes.</span>
<span id="L185" class="LineNr">185 </span><span class="Comment">//:</span>
<span id="L186" class="LineNr">186 </span><span class="Comment">//: The layer to expand labels later hooks into num_bytes() to teach this</span>
<span id="L187" class="LineNr">187 </span><span class="Comment">//: layer that labels occupy zero space in the binary.</span>
</pre>
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