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<title>Mu - linux/bootstrap/036labels.cc</title>
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<a href='https://github.com/akkartik/mu/blob/main/linux/bootstrap/036labels.cc'>https://github.com/akkartik/mu/blob/main/linux/bootstrap/036labels.cc</a>
<pre id='vimCodeElement'>
<span id="L1" class="LineNr"> 1 </span><span class="Comment">//: Labels are defined by ending names with a ':'. This layer will compute</span>
<span id="L2" class="LineNr"> 2 </span><span class="Comment">//: displacements for labels, and compute the offset for instructions using them.</span>
<span id="L3" class="LineNr"> 3 </span><span class="Comment">//:</span>
<span id="L4" class="LineNr"> 4 </span><span class="Comment">//: We won't check this, but our convention will be that jump targets will</span>
<span id="L5" class="LineNr"> 5 </span><span class="Comment">//: start with a '$', while functions will not. Function names will never be</span>
<span id="L6" class="LineNr"> 6 </span><span class="Comment">//: jumped to, and jump targets will never be called.</span>
<span id="L7" class="LineNr"> 7 </span>
<span id="L8" class="LineNr"> 8 </span><span class="Comment">//: We're introducing non-number names for the first time, so it's worth</span>
<span id="L9" class="LineNr"> 9 </span><span class="Comment">//: laying down some ground rules all transforms will follow, so things don't</span>
<span id="L10" class="LineNr"> 10 </span><span class="Comment">//: get too confusing:</span>
<span id="L11" class="LineNr"> 11 </span><span class="Comment">//: - if it starts with a digit, it's treated as a number. If it can't be</span>
<span id="L12" class="LineNr"> 12 </span><span class="Comment">//: parsed as hex it will raise an error.</span>
<span id="L13" class="LineNr"> 13 </span><span class="Comment">//: - if it starts with '-' it's treated as a number.</span>
<span id="L14" class="LineNr"> 14 </span><span class="Comment">//: - if it starts with '0x' it's treated as a number.</span>
<span id="L15" class="LineNr"> 15 </span><span class="Comment">//: - if it's two characters long, it can't be a name. Either it's a hex</span>
<span id="L16" class="LineNr"> 16 </span><span class="Comment">//: byte, or it raises an error.</span>
<span id="L17" class="LineNr"> 17 </span><span class="Comment">//: That's it. Names can start with any non-digit that isn't a dash. They can</span>
<span id="L18" class="LineNr"> 18 </span><span class="Comment">//: be a single character long. 'a' is not a hex number, it's a variable.</span>
<span id="L19" class="LineNr"> 19 </span><span class="Comment">//: Later layers may add more conventions partitioning the space of names. But</span>
<span id="L20" class="LineNr"> 20 </span><span class="Comment">//: the above rules will remain inviolate.</span>
<span id="L21" class="LineNr"> 21 </span>
<span id="L22" class="LineNr"> 22 </span><span class="Comment">//: One special label is 'Entry', the address to start running the program at.</span>
<span id="L23" class="LineNr"> 23 </span><span class="Comment">//: It can be non-unique; the last declaration overrides earlier ones.</span>
<span id="L24" class="LineNr"> 24 </span><span class="Comment">//: It must exist in a program. Otherwise we don't know where to start running</span>
<span id="L25" class="LineNr"> 25 </span><span class="Comment">//: programs.</span>
<span id="L26" class="LineNr"> 26 </span>
<span id="L27" class="LineNr"> 27 </span><span class="Normal">void</span> <a href='036labels.cc.html#L27'>test_Entry_label</a><span class="Delimiter">()</span> <span class="Delimiter">{</span>
<span id="L28" class="LineNr"> 28 </span> <a href='011run.cc.html#L82'>run</a><span class="Delimiter">(</span>
<span id="L29" class="LineNr"> 29 </span> <span class="Constant">"== code 0x1</span><span class="cSpecial">\n</span><span class="Constant">"</span>
<span id="L30" class="LineNr"> 30 </span> <span class="Constant">"05 0x0d0c0b0a/imm32</span><span class="cSpecial">\n</span><span class="Constant">"</span>
<span id="L31" class="LineNr"> 31 </span> <span class="Constant">"Entry:</span><span class="cSpecial">\n</span><span class="Constant">"</span>
<span id="L32" class="LineNr"> 32 </span> <span class="Constant">"05 0x0d0c0b0a/imm32</span><span class="cSpecial">\n</span><span class="Constant">"</span>
<span id="L33" class="LineNr"> 33 </span> <span class="Delimiter">);</span>
<span id="L34" class="LineNr"> 34 </span> <a href='003trace.cc.html#L290'>CHECK_TRACE_CONTENTS</a><span class="Delimiter">(</span>
<span id="L35" class="LineNr"> 35 </span> <span class="Constant">"run: 0x00000006 opcode: 05</span><span class="cSpecial">\n</span><span class="Constant">"</span>
<span id="L36" class="LineNr"> 36 </span> <span class="Delimiter">);</span>
<span id="L37" class="LineNr"> 37 </span> <a href='003trace.cc.html#L292'>CHECK_TRACE_DOESNT_CONTAIN</a><span class="Delimiter">(</span><span class="Constant">"run: 0x00000001 opcode: 05"</span><span class="Delimiter">);</span>
<span id="L38" class="LineNr"> 38 </span><span class="Delimiter">}</span>
<span id="L39" class="LineNr"> 39 </span>
<span id="L40" class="LineNr"> 40 </span><span class="Delimiter">:(before "End <a href='032operands.cc.html#L593'>looks_like_hex_int</a>(s) Detectors")</span>
<span id="L41" class="LineNr"> 41 </span><span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L168'>SIZE</a><span class="Delimiter">(</span>s<span class="Delimiter">)</span> == <span class="Constant">2</span><span class="Delimiter">)</span> <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
<span id="L42" class="LineNr"> 42 </span>
<span id="L43" class="LineNr"> 43 </span><span class="Delimiter">:(code)</span>
<span id="L44" class="LineNr"> 44 </span><span class="Normal">void</span> <a href='036labels.cc.html#L44'>test_pack_immediate_ignores_single_byte_nondigit_argument</a><span class="Delimiter">()</span> <span class="Delimiter">{</span>
<span id="L45" class="LineNr"> 45 </span> Hide_errors = <span class="Constant">true</span><span class="Delimiter">;</span>
<span id="L46" class="LineNr"> 46 </span> transform<span class="Delimiter">(</span>
<span id="L47" class="LineNr"> 47 </span> <span class="Constant">"== code 0x1</span><span class="cSpecial">\n</span><span class="Constant">"</span>
<span id="L48" class="LineNr"> 48 </span> <span class="Constant">"b9/copy a/imm32</span><span class="cSpecial">\n</span><span class="Constant">"</span>
<span id="L49" class="LineNr"> 49 </span> <span class="Delimiter">);</span>
<span id="L50" class="LineNr"> 50 </span> <a href='003trace.cc.html#L290'>CHECK_TRACE_CONTENTS</a><span class="Delimiter">(</span>
<span id="L51" class="LineNr"> 51 </span> <span class="Constant">"transform: packing instruction 'b9/copy a/imm32'</span><span class="cSpecial">\n</span><span class="Constant">"</span>
<span id="L52" class="LineNr"> 52 </span> <span class="Comment">// no change (we're just not printing metadata to the trace)</span>
<span id="L53" class="LineNr"> 53 </span> <span class="Constant">"transform: instruction after packing: 'b9 a'</span><span class="cSpecial">\n</span><span class="Constant">"</span>
<span id="L54" class="LineNr"> 54 </span> <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="Normal">void</span> <a href='036labels.cc.html#L57'>test_pack_immediate_ignores_3_hex_digit_argument</a><span class="Delimiter">()</span> <span class="Delimiter">{</span>
<span id="L58" class="LineNr"> 58 </span> Hide_errors = <span class="Constant">true</span><span class="Delimiter">;</span>
<span id="L59" class="LineNr"> 59 </span> transform<span class="Delimiter">(</span>
<span id="L60" class="LineNr"> 60 </span> <span class="Constant">"== code 0x1</span><span class="cSpecial">\n</span><span class="Constant">"</span>
<span id="L61" class="LineNr"> 61 </span> <span class="Constant">"b9/copy aaa/imm32</span><span class="cSpecial">\n</span><span class="Constant">"</span>
<span id="L62" class="LineNr"> 62 </span> <span class="Delimiter">);</span>
<span id="L63" class="LineNr"> 63 </span> <a href='003trace.cc.html#L290'>CHECK_TRACE_CONTENTS</a><span class="Delimiter">(</span>
<span id="L64" class="LineNr"> 64 </span> <span class="Constant">"transform: packing instruction 'b9/copy aaa/imm32'</span><span class="cSpecial">\n</span><span class="Constant">"</span>
<span id="L65" class="LineNr"> 65 </span> <span class="Comment">// no change (we're just not printing metadata to the trace)</span>
<span id="L66" class="LineNr"> 66 </span> <span class="Constant">"transform: instruction after packing: 'b9 aaa'</span><span class="cSpecial">\n</span><span class="Constant">"</span>
<span id="L67" class="LineNr"> 67 </span> <span class="Delimiter">);</span>
<span id="L68" class="LineNr"> 68 </span><span class="Delimiter">}</span>
<span id="L69" class="LineNr"> 69 </span>
<span id="L70" class="LineNr"> 70 </span><span class="Normal">void</span> <a href='036labels.cc.html#L70'>test_pack_immediate_ignores_non_hex_argument</a><span class="Delimiter">()</span> <span class="Delimiter">{</span>
<span id="L71" class="LineNr"> 71 </span> Hide_errors = <span class="Constant">true</span><span class="Delimiter">;</span>
<span id="L72" class="LineNr"> 72 </span> transform<span class="Delimiter">(</span>
<span id="L73" class="LineNr"> 73 </span> <span class="Constant">"== code 0x1</span><span class="cSpecial">\n</span><span class="Constant">"</span>
<span id="L74" class="LineNr"> 74 </span> <span class="Constant">"b9/copy xxx/imm32</span><span class="cSpecial">\n</span><span class="Constant">"</span>
<span id="L75" class="LineNr"> 75 </span> <span class="Delimiter">);</span>
<span id="L76" class="LineNr"> 76 </span> <a href='003trace.cc.html#L290'>CHECK_TRACE_CONTENTS</a><span class="Delimiter">(</span>
<span id="L77" class="LineNr"> 77 </span> <span class="Constant">"transform: packing instruction 'b9/copy xxx/imm32'</span><span class="cSpecial">\n</span><span class="Constant">"</span>
<span id="L78" class="LineNr"> 78 </span> <span class="Comment">// no change (we're just not printing metadata to the trace)</span>
<span id="L79" class="LineNr"> 79 </span> <span class="Constant">"transform: instruction after packing: 'b9 xxx'</span><span class="cSpecial">\n</span><span class="Constant">"</span>
<span id="L80" class="LineNr"> 80 </span> <span class="Delimiter">);</span>
<span id="L81" class="LineNr"> 81 </span><span class="Delimiter">}</span>
<span id="L82" class="LineNr"> 82 </span>
<span id="L83" class="LineNr"> 83 </span><span class="Comment">//: a helper we'll find handy later</span>
<span id="L84" class="LineNr"> 84 </span><span class="Normal">void</span> <a href='036labels.cc.html#L84'>check_valid_name</a><span class="Delimiter">(</span><span class="Normal">const</span> string& s<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L85" class="LineNr"> 85 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>s<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Delimiter">{</span>
<span id="L86" class="LineNr"> 86 </span> <a href='003trace.cc.html#L226'>raise</a> << <span class="Constant">"empty name!</span><span class="cSpecial">\n</span><span class="Constant">"</span> << end<span class="Delimiter">();</span>
<span id="L87" class="LineNr"> 87 </span> <span class="Identifier">return</span><span class="Delimiter">;</span>
<span id="L88" class="LineNr"> 88 </span> <span class="Delimiter">}</span>
<span id="L89" class="LineNr"> 89 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>s<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)</span> == <span class="Constant">'-'</span><span class="Delimiter">)</span>
<span id="L90" class="LineNr"> 90 </span> <a href='003trace.cc.html#L226'>raise</a> << <span class="Constant">"'"</span> << s << <span class="Constant">"' starts with '-', which can be confused with a negative number; use a different <a href='011run.cc.html#L111'>name</a></span><span class="cSpecial">\n</span><span class="Constant">"</span> << end<span class="Delimiter">();</span>
<span id="L91" class="LineNr"> 91 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>s<span class="Delimiter">.</span>substr<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">,</span> <span class="Constant">2</span><span class="Delimiter">)</span> == <span class="Constant">"0x"</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L92" class="LineNr"> 92 </span> <a href='003trace.cc.html#L226'>raise</a> << <span class="Constant">"'"</span> << s << <span class="Constant">"' looks like a hex number; use a different <a href='011run.cc.html#L111'>name</a></span><span class="cSpecial">\n</span><span class="Constant">"</span> << end<span class="Delimiter">();</span>
<span id="L93" class="LineNr"> 93 </span> <span class="Identifier">return</span><span class="Delimiter">;</span>
<span id="L94" class="LineNr"> 94 </span> <span class="Delimiter">}</span>
<span id="L95" class="LineNr"> 95 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>isdigit<span class="Delimiter">(</span>s<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)))</span>
<span id="L96" class="LineNr"> 96 </span> <a href='003trace.cc.html#L226'>raise</a> << <span class="Constant">"'"</span> << s << <span class="Constant">"' starts with a digit, and so can be confused with a number; use a different name.</span><span class="cSpecial">\n</span><span class="Constant">"</span> << end<span class="Delimiter">();</span>
<span id="L97" class="LineNr"> 97 </span> <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L168'>SIZE</a><span class="Delimiter">(</span>s<span class="Delimiter">)</span> == <span class="Constant">2</span><span class="Delimiter">)</span>
<span id="L98" class="LineNr"> 98 </span> <a href='003trace.cc.html#L226'>raise</a> << <span class="Constant">"'"</span> << s << <span class="Constant">"' is two characters long, which can look like raw hex bytes at a glance; use a different <a href='011run.cc.html#L111'>name</a></span><span class="cSpecial">\n</span><span class="Constant">"</span> << end<span class="Delimiter">();</span>
<span id="L99" class="LineNr"> 99 </span><span class="Delimiter">}</span>
<span id="L100" class="LineNr">100 </span>
<span id="L101" class="LineNr">101 </span><span class="Comment">//: Now that that's done, let's start using names as labels.</span>
<span id="L102" class="LineNr">102 </span>
<span id="L103" class="LineNr">103 </span><span class="Normal">void</span> <a href='036labels.cc.html#L103'>test_map_label</a><span class="Delimiter">()</span> <span class="Delimiter">{</span>
<span id="L104" class="LineNr">104 </span> transform<span class="Delimiter">(</span>
<span id="L105" class="LineNr">105 </span> <span class="Constant">"== code 0x1</span><span class="cSpecial">\n</span><span class="Constant">"</span>
<span id="L106" class="LineNr">106 </span> <span class="Constant">"loop:</span><span class="cSpecial">\n</span><span class="Constant">"</span>
<span id="L107" class="LineNr">107 </span> <span class="Constant">" 05 0x0d0c0b0a/imm32</span><span class="cSpecial">\n</span><span class="Constant">"</span>
<span id="L108" class="LineNr">108 </span> <span class="Delimiter">);</span>
<span id="L109" class="LineNr">109 </span> <a href='003trace.cc.html#L290'>CHECK_TRACE_CONTENTS</a><span class="Delimiter">(</span>
<span id="L110" class="LineNr">110 </span> <span class="Constant">"transform: label 'loop' is at address 1</span><span class="cSpecial">\n</span><span class="Constant">"</span>
<span id="L111" class="LineNr">111 </span> <span class="Delimiter">);</span>
<span id="L112" class="LineNr">112 </span><span class="Delimiter">}</span>
<span id="L113" class="LineNr">113 </span>
<span id="L114" class="LineNr">114 </span><span class="Delimiter">:(before "End Transforms")</span>
<span id="L115" class="LineNr">115 </span><a href='031transforms.cc.html#L4'>Transform</a><span class="Delimiter">.</span>push_back<span class="Delimiter">(</span><a href='036labels.cc.html#L117'>rewrite_labels</a><span class="Delimiter">);</span>
<span id="L116" class="LineNr">116 </span><span class="Delimiter">:(code)</span>
<span id="L117" class="LineNr">117 </span><span class="Normal">void</span> <a href='036labels.cc.html#L117'>rewrite_labels</a><span class="Delimiter">(</span>program& p<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L118" class="LineNr">118 </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">"-- rewrite labels"</span> << end<span class="Delimiter">();</span>
<span id="L119" class="LineNr">119 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>p<span class="Delimiter">.</span><a href='011run.cc.html#L106'>segments</a><span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
<span id="L120" class="LineNr">120 </span> segment& code = *find<span class="Delimiter">(</span>p<span class="Delimiter">,</span> <span class="Constant">"code"</span><span class="Delimiter">);</span>
<span id="L121" class="LineNr">121 </span> map<string<span class="Delimiter">,</span> <span class="Normal">int32_t</span>> byte_index<span class="Delimiter">;</span> <span class="Comment">// values are unsigned, but we're going to do subtractions on them so they need to fit in 31 bits</span>
<span id="L122" class="LineNr">122 </span> <a href='036labels.cc.html#L131'>compute_byte_indices_for_labels</a><span class="Delimiter">(</span>code<span class="Delimiter">,</span> byte_index<span class="Delimiter">);</span>
<span id="L123" class="LineNr">123 </span> <span class="Normal">if</span> <span class="Delimiter">(</span><a href='003trace.cc.html#L262'>trace_contains_errors</a><span class="Delimiter">())</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
<span id="L124" class="LineNr">124 </span> <a href='036labels.cc.html#L205'>drop_labels</a><span class="Delimiter">(</span>code<span class="Delimiter">);</span>
<span id="L125" class="LineNr">125 </span> <span class="Normal">if</span> <span class="Delimiter">(</span><a href='003trace.cc.html#L262'>trace_contains_errors</a><span class="Delimiter">())</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
<span id="L126" class="LineNr">126 </span> <a href='036labels.cc.html#L217'>replace_labels_with_displacements</a><span class="Delimiter">(</span>code<span class="Delimiter">,</span> byte_index<span class="Delimiter">);</span>
<span id="L127" class="LineNr">127 </span> <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L231'>contains_key</a><span class="Delimiter">(</span>byte_index<span class="Delimiter">,</span> <span class="Constant">"Entry"</span><span class="Delimiter">))</span>
<span id="L128" class="LineNr">128 </span> p<span class="Delimiter">.</span><a href='011run.cc.html#L105'>entry</a> = code<span class="Delimiter">.</span>start + get<span class="Delimiter">(</span>byte_index<span class="Delimiter">,</span> <span class="Constant">"Entry"</span><span class="Delimiter">);</span>
<span id="L129" class="LineNr">129 </span><span class="Delimiter">}</span>
<span id="L130" class="LineNr">130 </span>
<span id="L131" class="LineNr">131 </span><span class="Normal">void</span> <a href='036labels.cc.html#L131'>compute_byte_indices_for_labels</a><span class="Delimiter">(</span><span class="Normal">const</span> segment& code<span class="Delimiter">,</span> map<string<span class="Delimiter">,</span> <span class="Normal">int32_t</span>>& byte_index<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L132" class="LineNr">132 </span> <span class="Normal">int</span> current_byte = <span class="Constant">0</span><span class="Delimiter">;</span>
<span id="L133" class="LineNr">133 </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#L168'>SIZE</a><span class="Delimiter">(</span>code<span class="Delimiter">.</span><a href='011run.cc.html#L113'>lines</a><span class="Delimiter">);</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L134" class="LineNr">134 </span> <span class="Normal">const</span> line& inst = code<span class="Delimiter">.</span><a href='011run.cc.html#L113'>lines</a><span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
<span id="L135" class="LineNr">135 </span> <span class="Normal">if</span> <span class="Delimiter">(</span><a href='036labels.cc.html#L184'>Source_lines_file</a><span class="Delimiter">.</span>is_open<span class="Delimiter">()</span> && !inst<span class="Delimiter">.</span>original<span class="Delimiter">.</span>empty<span class="Delimiter">()</span> && <span class="Comment">/*</span><span class="Comment">not a label</span><span class="Comment">*/</span> *inst<span class="Delimiter">.</span><a href='011run.cc.html#L122'>words</a><span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>data<span class="Delimiter">.</span>rbegin<span class="Delimiter">()</span> != <span class="Constant">':'</span><span class="Delimiter">)</span>
<span id="L136" class="LineNr">136 </span> <a href='036labels.cc.html#L184'>Source_lines_file</a> << <span class="Constant">"0x"</span> << <a href='010vm.cc.html#L408'>HEXWORD</a> << <span class="Delimiter">(</span>code<span class="Delimiter">.</span>start + current_byte<span class="Delimiter">)</span> << <span class="Constant">' '</span> << inst<span class="Delimiter">.</span>original << <span class="cSpecial">'\n'</span><span class="Delimiter">;</span>
<span id="L137" class="LineNr">137 </span> <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> j = <span class="Constant">0</span><span class="Delimiter">;</span> j < <a href='001help.cc.html#L168'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span><a href='011run.cc.html#L122'>words</a><span class="Delimiter">);</span> ++j<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L138" class="LineNr">138 </span> <span class="Normal">const</span> word& curr = inst<span class="Delimiter">.</span><a href='011run.cc.html#L122'>words</a><span class="Delimiter">.</span>at<span class="Delimiter">(</span>j<span class="Delimiter">);</span>
<span id="L139" class="LineNr">139 </span> <span class="Comment">// hack: if we have any argument metadata left after previous transforms,</span>
<span id="L140" class="LineNr">140 </span> <span class="Comment">// deduce its size</span>
<span id="L141" class="LineNr">141 </span> <span class="Comment">// Maybe we should just move this transform to before instruction</span>
<span id="L142" class="LineNr">142 </span> <span class="Comment">// packing, and deduce the size of *all* arguments. But then we'll also</span>
<span id="L143" class="LineNr">143 </span> <span class="Comment">// have to deal with bitfields.</span>
<span id="L144" class="LineNr">144 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>has_argument_metadata<span class="Delimiter">(</span>curr<span class="Delimiter">,</span> <span class="Constant">"disp32"</span><span class="Delimiter">)</span> || has_argument_metadata<span class="Delimiter">(</span>curr<span class="Delimiter">,</span> <span class="Constant">"imm32"</span><span class="Delimiter">))</span> <span class="Delimiter">{</span>
<span id="L145" class="LineNr">145 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>*curr<span class="Delimiter">.</span>data<span class="Delimiter">.</span>rbegin<span class="Delimiter">()</span> == <span class="Constant">':'</span><span class="Delimiter">)</span>
<span id="L146" class="LineNr">146 </span> <a href='003trace.cc.html#L226'>raise</a> << <span class="Constant">"'"</span> << to_string<span class="Delimiter">(</span>inst<span class="Delimiter">)</span> << <span class="Constant">"': don't use ':' when jumping to labels</span><span class="cSpecial">\n</span><span class="Constant">"</span> << end<span class="Delimiter">();</span>
<span id="L147" class="LineNr">147 </span> current_byte += <span class="Constant">4</span><span class="Delimiter">;</span>
<span id="L148" class="LineNr">148 </span> <span class="Delimiter">}</span>
<span id="L149" class="LineNr">149 </span> <span class="Normal">else</span> <span class="Normal">if</span> <span class="Delimiter">(</span>has_argument_metadata<span class="Delimiter">(</span>curr<span class="Delimiter">,</span> <span class="Constant">"disp16"</span><span class="Delimiter">))</span> <span class="Delimiter">{</span>
<span id="L150" class="LineNr">150 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>*curr<span class="Delimiter">.</span>data<span class="Delimiter">.</span>rbegin<span class="Delimiter">()</span> == <span class="Constant">':'</span><span class="Delimiter">)</span>
<span id="L151" class="LineNr">151 </span> <a href='003trace.cc.html#L226'>raise</a> << <span class="Constant">"'"</span> << to_string<span class="Delimiter">(</span>inst<span class="Delimiter">)</span> << <span class="Constant">"': don't use ':' when jumping to labels</span><span class="cSpecial">\n</span><span class="Constant">"</span> << end<span class="Delimiter">();</span>
<span id="L152" class="LineNr">152 </span> current_byte += <span class="Constant">2</span><span class="Delimiter">;</span>
<span id="L153" class="LineNr">153 </span> <span class="Delimiter">}</span>
<span id="L154" class="LineNr">154 </span> <span class="Comment">// automatically handle /disp8 and /imm8 here</span>
<span id="L155" class="LineNr">155 </span> <span class="Normal">else</span> <span class="Normal">if</span> <span class="Delimiter">(</span>*curr<span class="Delimiter">.</span>data<span class="Delimiter">.</span>rbegin<span class="Delimiter">()</span> != <span class="Constant">':'</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L156" class="LineNr">156 </span> ++current_byte<span class="Delimiter">;</span>
<span id="L157" class="LineNr">157 </span> <span class="Delimiter">}</span>
<span id="L158" class="LineNr">158 </span> <span class="Normal">else</span> <span class="Delimiter">{</span>
<span id="L159" class="LineNr">159 </span> string label = <a href='036labels.cc.html#L276'>drop_last</a><span class="Delimiter">(</span>curr<span class="Delimiter">.</span>data<span class="Delimiter">);</span>
<span id="L160" class="LineNr">160 </span> <span class="Comment">// ensure labels look sufficiently different from raw hex</span>
<span id="L161" class="LineNr">161 </span> <a href='036labels.cc.html#L84'>check_valid_name</a><span class="Delimiter">(</span>label<span class="Delimiter">);</span>
<span id="L162" class="LineNr">162 </span> <span class="Normal">if</span> <span class="Delimiter">(</span><a href='003trace.cc.html#L262'>trace_contains_errors</a><span class="Delimiter">())</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
<span id="L163" class="LineNr">163 </span> <span class="Normal">if</span> <span class="Delimiter">(</span><a href='032operands.cc.html#L550'>contains_any_argument_metadata</a><span class="Delimiter">(</span>curr<span class="Delimiter">))</span>
<span id="L164" class="LineNr">164 </span> <a href='003trace.cc.html#L226'>raise</a> << <span class="Constant">"'"</span> << to_string<span class="Delimiter">(</span>inst<span class="Delimiter">)</span> << <span class="Constant">"': label definition (':') not allowed in argument</span><span class="cSpecial">\n</span><span class="Constant">"</span> << end<span class="Delimiter">();</span>
<span id="L165" class="LineNr">165 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>j > <span class="Constant">0</span><span class="Delimiter">)</span>
<span id="L166" class="LineNr">166 </span> <a href='003trace.cc.html#L226'>raise</a> << <span class="Constant">"'"</span> << to_string<span class="Delimiter">(</span>inst<span class="Delimiter">)</span> << <span class="Constant">"': labels can only be the first <a href='011run.cc.html#L127'>word</a> in a line.</span><span class="cSpecial">\n</span><span class="Constant">"</span> << end<span class="Delimiter">();</span>
<span id="L167" class="LineNr">167 </span> <span class="Normal">if</span> <span class="Delimiter">(</span><a href='036labels.cc.html#L183'>Labels_file</a><span class="Delimiter">.</span>is_open<span class="Delimiter">())</span>
<span id="L168" class="LineNr">168 </span> <a href='036labels.cc.html#L183'>Labels_file</a> << <span class="Constant">"0x"</span> << <a href='010vm.cc.html#L408'>HEXWORD</a> << <span class="Delimiter">(</span>code<span class="Delimiter">.</span>start + current_byte<span class="Delimiter">)</span> << <span class="Constant">' '</span> << label << <span class="cSpecial">'\n'</span><span class="Delimiter">;</span>
<span id="L169" class="LineNr">169 </span> <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L231'>contains_key</a><span class="Delimiter">(</span>byte_index<span class="Delimiter">,</span> label<span class="Delimiter">)</span> && label != <span class="Constant">"Entry"</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L170" class="LineNr">170 </span> <a href='003trace.cc.html#L226'>raise</a> << <span class="Constant">"duplicate label '"</span> << label << <span class="Constant">"'</span><span class="cSpecial">\n</span><span class="Constant">"</span> << end<span class="Delimiter">();</span>
<span id="L171" class="LineNr">171 </span> <span class="Identifier">return</span><span class="Delimiter">;</span>
<span id="L172" class="LineNr">172 </span> <span class="Delimiter">}</span>
<span id="L173" class="LineNr">173 </span> <a href='001help.cc.html#L227'>put</a><span class="Delimiter">(</span>byte_index<span class="Delimiter">,</span> label<span class="Delimiter">,</span> current_byte<span class="Delimiter">);</span>
<span id="L174" class="LineNr">174 </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">"label '"</span> << label << <span class="Constant">"' is at address "</span> << <span class="Delimiter">(</span>current_byte+code<span class="Delimiter">.</span>start<span class="Delimiter">)</span> << end<span class="Delimiter">();</span>
<span id="L175" class="LineNr">175 </span> <span class="Comment">// no modifying current_byte; label definitions won't be in the final binary</span>
<span id="L176" class="LineNr">176 </span> <span class="Delimiter">}</span>
<span id="L177" class="LineNr">177 </span> <span class="Delimiter">}</span>
<span id="L178" class="LineNr">178 </span> <span class="Delimiter">}</span>
<span id="L179" class="LineNr">179 </span><span class="Delimiter">}</span>
<span id="L180" class="LineNr">180 </span>
<span id="L181" class="LineNr">181 </span><span class="Delimiter">:(before "End Globals")</span>
<span id="L182" class="LineNr">182 </span><span class="Normal">bool</span> <a href='036labels.cc.html#L182'>Dump_debug_info</a> = <span class="Constant">false</span><span class="Delimiter">;</span> <span class="Comment">// currently used only by 'bootstrap translate'</span>
<span id="L183" class="LineNr">183 </span>ofstream <a href='036labels.cc.html#L183'>Labels_file</a><span class="Delimiter">;</span>
<span id="L184" class="LineNr">184 </span>ofstream <a href='036labels.cc.html#L184'>Source_lines_file</a><span class="Delimiter">;</span>
<span id="L185" class="LineNr">185 </span><span class="Delimiter">:(before "End Commandline Options")</span>
<span id="L186" class="LineNr">186 </span><span class="Normal">else</span> <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L98'>is_equal</a><span class="Delimiter">(</span>*arg<span class="Delimiter">,</span> <span class="Constant">"--debug"</span><span class="Delimiter">))</span> <span class="Delimiter">{</span>
<span id="L187" class="LineNr">187 </span> <a href='036labels.cc.html#L182'>Dump_debug_info</a> = <span class="Constant">true</span><span class="Delimiter">;</span>
<span id="L188" class="LineNr">188 </span> <span class="Comment">// End --debug Settings</span>
<span id="L189" class="LineNr">189 </span><span class="Delimiter">}</span>
<span id="L190" class="LineNr">190 </span><span class="Comment">//: wait to open "labels" for writing until we're sure we aren't trying to read it</span>
<span id="L191" class="LineNr">191 </span><span class="Delimiter">:(after "Begin bootstrap translate")</span>
<span id="L192" class="LineNr">192 </span><span class="Normal">if</span> <span class="Delimiter">(</span><a href='036labels.cc.html#L182'>Dump_debug_info</a><span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L193" class="LineNr">193 </span> cerr << <span class="Constant">"saving address->label information to 'labels'</span><span class="cSpecial">\n</span><span class="Constant">"</span><span class="Delimiter">;</span>
<span id="L194" class="LineNr">194 </span> <a href='036labels.cc.html#L183'>Labels_file</a><span class="Delimiter">.</span>open<span class="Delimiter">(</span><span class="Constant">"labels"</span><span class="Delimiter">);</span>
<span id="L195" class="LineNr">195 </span> cerr << <span class="Constant">"saving address->source information to 'source_lines'</span><span class="cSpecial">\n</span><span class="Constant">"</span><span class="Delimiter">;</span>
<span id="L196" class="LineNr">196 </span> <a href='036labels.cc.html#L184'>Source_lines_file</a><span class="Delimiter">.</span>open<span class="Delimiter">(</span><span class="Constant">"source_lines"</span><span class="Delimiter">);</span>
<span id="L197" class="LineNr">197 </span><span class="Delimiter">}</span>
<span id="L198" class="LineNr">198 </span><span class="Delimiter">:(before "End bootstrap translate")</span>
<span id="L199" class="LineNr">199 </span><span class="Normal">if</span> <span class="Delimiter">(</span><a href='036labels.cc.html#L182'>Dump_debug_info</a><span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L200" class="LineNr">200 </span> <a href='036labels.cc.html#L183'>Labels_file</a><span class="Delimiter">.</span>close<span class="Delimiter">();</span>
<span id="L201" class="LineNr">201 </span> <a href='036labels.cc.html#L184'>Source_lines_file</a><span class="Delimiter">.</span>close<span class="Delimiter">();</span>
<span id="L202" class="LineNr">202 </span><span class="Delimiter">}</span>
<span id="L203" class="LineNr">203 </span>
<span id="L204" class="LineNr">204 </span><span class="Delimiter">:(code)</span>
<span id="L205" class="LineNr">205 </span><span class="Normal">void</span> <a href='036labels.cc.html#L205'>drop_labels</a><span class="Delimiter">(</span>segment& code<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L206" class="LineNr">206 </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#L168'>SIZE</a><span class="Delimiter">(</span>code<span class="Delimiter">.</span><a href='011run.cc.html#L113'>lines</a><span class="Delimiter">);</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L207" class="LineNr">207 </span> line& inst = code<span class="Delimiter">.</span><a href='011run.cc.html#L113'>lines</a><span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
<span id="L208" class="LineNr">208 </span> vector<word>::iterator new_end = remove_if<span class="Delimiter">(</span>inst<span class="Delimiter">.</span><a href='011run.cc.html#L122'>words</a><span class="Delimiter">.</span>begin<span class="Delimiter">(),</span> inst<span class="Delimiter">.</span><a href='011run.cc.html#L122'>words</a><span class="Delimiter">.</span>end<span class="Delimiter">(),</span> <a href='036labels.cc.html#L213'>is_label</a><span class="Delimiter">);</span>
<span id="L209" class="LineNr">209 </span> inst<span class="Delimiter">.</span><a href='011run.cc.html#L122'>words</a><span class="Delimiter">.</span>erase<span class="Delimiter">(</span>new_end<span class="Delimiter">,</span> inst<span class="Delimiter">.</span><a href='011run.cc.html#L122'>words</a><span class="Delimiter">.</span>end<span class="Delimiter">());</span>
<span id="L210" class="LineNr">210 </span> <span class="Delimiter">}</span>
<span id="L211" class="LineNr">211 </span><span class="Delimiter">}</span>
<span id="L212" class="LineNr">212 </span>
<span id="L213" class="LineNr">213 </span><span class="Normal">bool</span> <a href='036labels.cc.html#L213'>is_label</a><span class="Delimiter">(</span><span class="Normal">const</span> word& w<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L214" class="LineNr">214 </span> <span class="Identifier">return</span> *w<span class="Delimiter">.</span>data<span class="Delimiter">.</span>rbegin<span class="Delimiter">()</span> == <span class="Constant">':'</span><span class="Delimiter">;</span>
<span id="L215" class="LineNr">215 </span><span class="Delimiter">}</span>
<span id="L216" class="LineNr">216 </span>
<span id="L217" class="LineNr">217 </span><span class="Normal">void</span> <a href='036labels.cc.html#L217'>replace_labels_with_displacements</a><span class="Delimiter">(</span>segment& code<span class="Delimiter">,</span> <span class="Normal">const</span> map<string<span class="Delimiter">,</span> <span class="Normal">int32_t</span>>& byte_index<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L218" class="LineNr">218 </span> <span class="Normal">int32_t</span> byte_index_next_instruction_starts_at = <span class="Constant">0</span><span class="Delimiter">;</span>
<span id="L219" class="LineNr">219 </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#L168'>SIZE</a><span class="Delimiter">(</span>code<span class="Delimiter">.</span><a href='011run.cc.html#L113'>lines</a><span class="Delimiter">);</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L220" class="LineNr">220 </span> line& inst = code<span class="Delimiter">.</span><a href='011run.cc.html#L113'>lines</a><span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
<span id="L221" class="LineNr">221 </span> byte_index_next_instruction_starts_at += <a href='035compute_segment_address.cc.html#L56'>num_bytes</a><span class="Delimiter">(</span>inst<span class="Delimiter">);</span>
<span id="L222" class="LineNr">222 </span> <a href='011run.cc.html#L121'>line</a> new_inst<span class="Delimiter">;</span>
<span id="L223" class="LineNr">223 </span> <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> j = <span class="Constant">0</span><span class="Delimiter">;</span> j < <a href='001help.cc.html#L168'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span><a href='011run.cc.html#L122'>words</a><span class="Delimiter">);</span> ++j<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L224" class="LineNr">224 </span> <span class="Normal">const</span> word& curr = inst<span class="Delimiter">.</span><a href='011run.cc.html#L122'>words</a><span class="Delimiter">.</span>at<span class="Delimiter">(</span>j<span class="Delimiter">);</span>
<span id="L225" class="LineNr">225 </span> <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L231'>contains_key</a><span class="Delimiter">(</span>byte_index<span class="Delimiter">,</span> curr<span class="Delimiter">.</span>data<span class="Delimiter">))</span> <span class="Delimiter">{</span>
<span id="L226" class="LineNr">226 </span> <span class="Normal">int32_t</span> displacement = <span class="Normal">static_cast</span><<span class="Normal">int32_t</span>><span class="Delimiter">(</span>get<span class="Delimiter">(</span>byte_index<span class="Delimiter">,</span> curr<span class="Delimiter">.</span>data<span class="Delimiter">))</span> - byte_index_next_instruction_starts_at<span class="Delimiter">;</span>
<span id="L227" class="LineNr">227 </span> <span class="Normal">int32_t</span> absolute_address = code<span class="Delimiter">.</span>start + get<span class="Delimiter">(</span>byte_index<span class="Delimiter">,</span> curr<span class="Delimiter">.</span>data<span class="Delimiter">);</span>
<span id="L228" class="LineNr">228 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>has_argument_metadata<span class="Delimiter">(</span>curr<span class="Delimiter">,</span> <span class="Constant">"disp8"</span><span class="Delimiter">))</span> <span class="Delimiter">{</span>
<span id="L229" class="LineNr">229 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>displacement > <span class="Constant">0x7f</span> || displacement < -<span class="Constant">0x7f</span><span class="Delimiter">)</span>
<span id="L230" class="LineNr">230 </span> <a href='003trace.cc.html#L226'>raise</a> << <span class="Constant">"'"</span> << to_string<span class="Delimiter">(</span>inst<span class="Delimiter">)</span> << <span class="Constant">"': label too far away for displacement "</span> << std::hex << displacement << <span class="Constant">" to fit in 8 signed bits</span><span class="cSpecial">\n</span><span class="Constant">"</span> << end<span class="Delimiter">();</span>
<span id="L231" class="LineNr">231 </span> <span class="Normal">else</span>
<span id="L232" class="LineNr">232 </span> emit_hex_bytes<span class="Delimiter">(</span>new_inst<span class="Delimiter">,</span> displacement<span class="Delimiter">,</span> <span class="Constant">1</span><span class="Delimiter">);</span>
<span id="L233" class="LineNr">233 </span> <span class="Delimiter">}</span>
<span id="L234" class="LineNr">234 </span> <span class="Normal">else</span> <span class="Normal">if</span> <span class="Delimiter">(</span>has_argument_metadata<span class="Delimiter">(</span>curr<span class="Delimiter">,</span> <span class="Constant">"disp16"</span><span class="Delimiter">))</span> <span class="Delimiter">{</span>
<span id="L235" class="LineNr">235 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>displacement > <span class="Constant">0x7fff</span> || displacement < -<span class="Constant">0x7fff</span><span class="Delimiter">)</span>
<span id="L236" class="LineNr">236 </span> <a href='003trace.cc.html#L226'>raise</a> << <span class="Constant">"'"</span> << to_string<span class="Delimiter">(</span>inst<span class="Delimiter">)</span> << <span class="Constant">"': label too far away for displacement "</span> << std::hex << displacement << <span class="Constant">" to fit in 16 signed bits</span><span class="cSpecial">\n</span><span class="Constant">"</span> << end<span class="Delimiter">();</span>
<span id="L237" class="LineNr">237 </span> <span class="Normal">else</span>
<span id="L238" class="LineNr">238 </span> emit_hex_bytes<span class="Delimiter">(</span>new_inst<span class="Delimiter">,</span> displacement<span class="Delimiter">,</span> <span class="Constant">2</span><span class="Delimiter">);</span>
<span id="L239" class="LineNr">239 </span> <span class="Delimiter">}</span>
<span id="L240" class="LineNr">240 </span> <span class="Normal">else</span> <span class="Normal">if</span> <span class="Delimiter">(</span>has_argument_metadata<span class="Delimiter">(</span>curr<span class="Delimiter">,</span> <span class="Constant">"disp32"</span><span class="Delimiter">))</span> <span class="Delimiter">{</span>
<span id="L241" class="LineNr">241 </span> <span class="Normal">if</span> <span class="Delimiter">(</span><a href='036labels.cc.html#L258'>is_far_jump_or_call</a><span class="Delimiter">(</span>new_inst<span class="Delimiter">))</span>
<span id="L242" class="LineNr">242 </span> emit_hex_bytes<span class="Delimiter">(</span>new_inst<span class="Delimiter">,</span> displacement<span class="Delimiter">,</span> <span class="Constant">4</span><span class="Delimiter">);</span>
<span id="L243" class="LineNr">243 </span> <span class="Normal">else</span>
<span id="L244" class="LineNr">244 </span> emit_hex_bytes<span class="Delimiter">(</span>new_inst<span class="Delimiter">,</span> absolute_address<span class="Delimiter">,</span> <span class="Constant">4</span><span class="Delimiter">);</span>
<span id="L245" class="LineNr">245 </span> <span class="Delimiter">}</span> <span class="Normal">else</span> <span class="Normal">if</span> <span class="Delimiter">(</span>has_argument_metadata<span class="Delimiter">(</span>curr<span class="Delimiter">,</span> <span class="Constant">"imm32"</span><span class="Delimiter">))</span> <span class="Delimiter">{</span>
<span id="L246" class="LineNr">246 </span> emit_hex_bytes<span class="Delimiter">(</span>new_inst<span class="Delimiter">,</span> absolute_address<span class="Delimiter">,</span> <span class="Constant">4</span><span class="Delimiter">);</span>
<span id="L247" class="LineNr">247 </span> <span class="Delimiter">}</span>
<span id="L248" class="LineNr">248 </span> <span class="Delimiter">}</span>
<span id="L249" class="LineNr">249 </span> <span class="Normal">else</span> <span class="Delimiter">{</span>
<span id="L250" class="LineNr">250 </span> new_inst<span class="Delimiter">.</span><a href='011run.cc.html#L122'>words</a><span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>curr<span class="Delimiter">);</span>
<span id="L251" class="LineNr">251 </span> <span class="Delimiter">}</span>
<span id="L252" class="LineNr">252 </span> <span class="Delimiter">}</span>
<span id="L253" class="LineNr">253 </span> inst<span class="Delimiter">.</span><a href='011run.cc.html#L122'>words</a><span class="Delimiter">.</span>swap<span class="Delimiter">(</span>new_inst<span class="Delimiter">.</span><a href='011run.cc.html#L122'>words</a><span class="Delimiter">);</span>
<span id="L254" class="LineNr">254 </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">"instruction after transform: '"</span> << data_to_string<span class="Delimiter">(</span>inst<span class="Delimiter">)</span> << <span class="Constant">"'"</span> << end<span class="Delimiter">();</span>
<span id="L255" class="LineNr">255 </span> <span class="Delimiter">}</span>
<span id="L256" class="LineNr">256 </span><span class="Delimiter">}</span>
<span id="L257" class="LineNr">257 </span>
<span id="L258" class="LineNr">258 </span><span class="Normal">bool</span> <a href='036labels.cc.html#L258'>is_far_jump_or_call</a><span class="Delimiter">(</span><span class="Normal">const</span> line& inst<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L259" class="LineNr">259 </span> string first_opcode = inst<span class="Delimiter">.</span><a href='011run.cc.html#L122'>words</a><span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>data<span class="Delimiter">;</span>
<span id="L260" class="LineNr">260 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>first_opcode == <span class="Constant">"e8"</span> || first_opcode == <span class="Constant">"e9"</span><span class="Delimiter">)</span> <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
<span id="L261" class="LineNr">261 </span> <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L168'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span><a href='011run.cc.html#L122'>words</a><span class="Delimiter">)</span> < <span class="Constant">2</span><span class="Delimiter">)</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
<span id="L262" class="LineNr">262 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>first_opcode != <span class="Constant">"0f"</span><span class="Delimiter">)</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
<span id="L263" class="LineNr">263 </span> string second_opcode = inst<span class="Delimiter">.</span><a href='011run.cc.html#L122'>words</a><span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>data<span class="Delimiter">;</span>
<span id="L264" class="LineNr">264 </span> <span class="Identifier">return</span> <a href='001help.cc.html#L104'>starts_with</a><span class="Delimiter">(</span>second_opcode<span class="Delimiter">,</span> <span class="Constant">"8"</span><span class="Delimiter">);</span>
<span id="L265" class="LineNr">265 </span><span class="Delimiter">}</span>
<span id="L266" class="LineNr">266 </span>
<span id="L267" class="LineNr">267 </span>string <a href='036labels.cc.html#L267'>data_to_string</a><span class="Delimiter">(</span><span class="Normal">const</span> line& inst<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L268" class="LineNr">268 </span> ostringstream out<span class="Delimiter">;</span>
<span id="L269" class="LineNr">269 </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#L168'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span><a href='011run.cc.html#L122'>words</a><span class="Delimiter">);</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L270" class="LineNr">270 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>i > <span class="Constant">0</span><span class="Delimiter">)</span> out << <span class="Constant">' '</span><span class="Delimiter">;</span>
<span id="L271" class="LineNr">271 </span> out << inst<span class="Delimiter">.</span><a href='011run.cc.html#L122'>words</a><span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>data<span class="Delimiter">;</span>
<span id="L272" class="LineNr">272 </span> <span class="Delimiter">}</span>
<span id="L273" class="LineNr">273 </span> <span class="Identifier">return</span> out<span class="Delimiter">.</span>str<span class="Delimiter">();</span>
<span id="L274" class="LineNr">274 </span><span class="Delimiter">}</span>
<span id="L275" class="LineNr">275 </span>
<span id="L276" class="LineNr">276 </span>string <a href='036labels.cc.html#L276'>drop_last</a><span class="Delimiter">(</span><span class="Normal">const</span> string& s<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L277" class="LineNr">277 </span> <span class="Identifier">return</span> string<span class="Delimiter">(</span>s<span class="Delimiter">.</span>begin<span class="Delimiter">(),</span> --s<span class="Delimiter">.</span>end<span class="Delimiter">());</span>
<span id="L278" class="LineNr">278 </span><span class="Delimiter">}</span>
<span id="L279" class="LineNr">279 </span>
<span id="L280" class="LineNr">280 </span><span class="Comment">//: Label definitions must be the first word on a line. No jumping inside</span>
<span id="L281" class="LineNr">281 </span><span class="Comment">//: instructions.</span>
<span id="L282" class="LineNr">282 </span><span class="Comment">//: They should also be the only word on a line.</span>
<span id="L283" class="LineNr">283 </span><span class="Comment">//: However, you can absolutely have multiple labels map to the same address,</span>
<span id="L284" class="LineNr">284 </span><span class="Comment">//: as long as they're on separate lines.</span>
<span id="L285" class="LineNr">285 </span>
<span id="L286" class="LineNr">286 </span><span class="Normal">void</span> <a href='036labels.cc.html#L286'>test_multiple_labels_at</a><span class="Delimiter">()</span> <span class="Delimiter">{</span>
<span id="L287" class="LineNr">287 </span> transform<span class="Delimiter">(</span>
<span id="L288" class="LineNr">288 </span> <span class="Constant">"== code 0x1</span><span class="cSpecial">\n</span><span class="Constant">"</span>
<span id="L289" class="LineNr">289 </span> <span class="Comment">// address 1</span>
<span id="L290" class="LineNr">290 </span> <span class="Constant">"loop:</span><span class="cSpecial">\n</span><span class="Constant">"</span>
<span id="L291" class="LineNr">291 </span> <span class="Constant">" $loop2:</span><span class="cSpecial">\n</span><span class="Constant">"</span>
<span id="L292" class="LineNr">292 </span> <span class="Comment">// address 1 (labels take up no space)</span>
<span id="L293" class="LineNr">293 </span> <span class="Constant">" 05 0x0d0c0b0a/imm32</span><span class="cSpecial">\n</span><span class="Constant">"</span>
<span id="L294" class="LineNr">294 </span> <span class="Comment">// address 6</span>
<span id="L295" class="LineNr">295 </span> <span class="Constant">" eb $loop2/disp8</span><span class="cSpecial">\n</span><span class="Constant">"</span>
<span id="L296" class="LineNr">296 </span> <span class="Comment">// address 8</span>
<span id="L297" class="LineNr">297 </span> <span class="Constant">" eb $loop3/disp8</span><span class="cSpecial">\n</span><span class="Constant">"</span>
<span id="L298" class="LineNr">298 </span> <span class="Comment">// address 0xa</span>
<span id="L299" class="LineNr">299 </span> <span class="Constant">" $loop3:</span><span class="cSpecial">\n</span><span class="Constant">"</span>
<span id="L300" class="LineNr">300 </span> <span class="Delimiter">);</span>
<span id="L301" class="LineNr">301 </span> <a href='003trace.cc.html#L290'>CHECK_TRACE_CONTENTS</a><span class="Delimiter">(</span>
<span id="L302" class="LineNr">302 </span> <span class="Constant">"transform: label 'loop' is at address 1</span><span class="cSpecial">\n</span><span class="Constant">"</span>
<span id="L303" class="LineNr">303 </span> <span class="Constant">"transform: label '$loop2' is at address 1</span><span class="cSpecial">\n</span><span class="Constant">"</span>
<span id="L304" class="LineNr">304 </span> <span class="Constant">"transform: label '$loop3' is at address a</span><span class="cSpecial">\n</span><span class="Constant">"</span>
<span id="L305" class="LineNr">305 </span> <span class="Comment">// first jump is to -7</span>
<span id="L306" class="LineNr">306 </span> <span class="Constant">"transform: instruction after transform: 'eb f9'</span><span class="cSpecial">\n</span><span class="Constant">"</span>
<span id="L307" class="LineNr">307 </span> <span class="Comment">// second jump is to 0 (fall through)</span>
<span id="L308" class="LineNr">308 </span> <span class="Constant">"transform: instruction after transform: 'eb 00'</span><span class="cSpecial">\n</span><span class="Constant">"</span>
<span id="L309" class="LineNr">309 </span> <span class="Delimiter">);</span>
<span id="L310" class="LineNr">310 </span><span class="Delimiter">}</span>
<span id="L311" class="LineNr">311 </span>
<span id="L312" class="LineNr">312 </span><span class="Normal">void</span> <a href='036labels.cc.html#L312'>test_loading_label_as_imm32</a><span class="Delimiter">()</span> <span class="Delimiter">{</span>
<span id="L313" class="LineNr">313 </span> transform<span class="Delimiter">(</span>
<span id="L314" class="LineNr">314 </span> <span class="Constant">"== code 0x1</span><span class="cSpecial">\n</span><span class="Constant">"</span>
<span id="L315" class="LineNr">315 </span> <span class="Constant">"label:</span><span class="cSpecial">\n</span><span class="Constant">"</span>
<span id="L316" class="LineNr">316 </span> <span class="Constant">" be/copy-to-ESI label/imm32</span><span class="cSpecial">\n</span><span class="Constant">"</span>
<span id="L317" class="LineNr">317 </span> <span class="Delimiter">);</span>
<span id="L318" class="LineNr">318 </span> <a href='003trace.cc.html#L290'>CHECK_TRACE_CONTENTS</a><span class="Delimiter">(</span>
<span id="L319" class="LineNr">319 </span> <span class="Constant">"transform: label 'label' is at address 1</span><span class="cSpecial">\n</span><span class="Constant">"</span>
<span id="L320" class="LineNr">320 </span> <span class="Constant">"transform: instruction after transform: 'be 01 00 00 00'</span><span class="cSpecial">\n</span><span class="Constant">"</span>
<span id="L321" class="LineNr">321 </span> <span class="Delimiter">);</span>
<span id="L322" class="LineNr">322 </span><span class="Delimiter">}</span>
<span id="L323" class="LineNr">323 </span>
<span id="L324" class="LineNr">324 </span><span class="Normal">void</span> <a href='036labels.cc.html#L324'>test_duplicate_label</a><span class="Delimiter">()</span> <span class="Delimiter">{</span>
<span id="L325" class="LineNr">325 </span> Hide_errors = <span class="Constant">true</span><span class="Delimiter">;</span>
<span id="L326" class="LineNr">326 </span> transform<span class="Delimiter">(</span>
<span id="L327" class="LineNr">327 </span> <span class="Constant">"== code 0x1</span><span class="cSpecial">\n</span><span class="Constant">"</span>
<span id="L328" class="LineNr">328 </span> <span class="Constant">"loop:</span><span class="cSpecial">\n</span><span class="Constant">"</span>
<span id="L329" class="LineNr">329 </span> <span class="Constant">"loop:</span><span class="cSpecial">\n</span><span class="Constant">"</span>
<span id="L330" class="LineNr">330 </span> <span class="Constant">" 05 0x0d0c0b0a/imm32</span><span class="cSpecial">\n</span><span class="Constant">"</span>
<span id="L331" class="LineNr">331 </span> <span class="Delimiter">);</span>
<span id="L332" class="LineNr">332 </span> <a href='003trace.cc.html#L290'>CHECK_TRACE_CONTENTS</a><span class="Delimiter">(</span>
<span id="L333" class="LineNr">333 </span> <span class="Constant">"error: duplicate label 'loop'</span><span class="cSpecial">\n</span><span class="Constant">"</span>
<span id="L334" class="LineNr">334 </span> <span class="Delimiter">);</span>
<span id="L335" class="LineNr">335 </span><span class="Delimiter">}</span>
<span id="L336" class="LineNr">336 </span>
<span id="L337" class="LineNr">337 </span><span class="Normal">void</span> <a href='036labels.cc.html#L337'>test_label_too_short</a><span class="Delimiter">()</span> <span class="Delimiter">{</span>
<span id="L338" class="LineNr">338 </span> Hide_errors = <span class="Constant">true</span><span class="Delimiter">;</span>
<span id="L339" class="LineNr">339 </span> transform<span class="Delimiter">(</span>
<span id="L340" class="LineNr">340 </span> <span class="Constant">"== code 0x1</span><span class="cSpecial">\n</span><span class="Constant">"</span>
<span id="L341" class="LineNr">341 </span> <span class="Constant">"xz:</span><span class="cSpecial">\n</span><span class="Constant">"</span>
<span id="L342" class="LineNr">342 </span> <span class="Constant">" 05 0x0d0c0b0a/imm32</span><span class="cSpecial">\n</span><span class="Constant">"</span>
<span id="L343" class="LineNr">343 </span> <span class="Delimiter">);</span>
<span id="L344" class="LineNr">344 </span> <a href='003trace.cc.html#L290'>CHECK_TRACE_CONTENTS</a><span class="Delimiter">(</span>
<span id="L345" class="LineNr">345 </span> <span class="Constant">"error: 'xz' is two characters long, which can look like raw hex bytes at a glance; use a different <a href='011run.cc.html#L111'>name</a></span><span class="cSpecial">\n</span><span class="Constant">"</span>
<span id="L346" class="LineNr">346 </span> <span class="Delimiter">);</span>
<span id="L347" class="LineNr">347 </span><span class="Delimiter">}</span>
<span id="L348" class="LineNr">348 </span>
<span id="L349" class="LineNr">349 </span><span class="Normal">void</span> <a href='036labels.cc.html#L349'>test_label_hex</a><span class="Delimiter">()</span> <span class="Delimiter">{</span>
<span id="L350" class="LineNr">350 </span> Hide_errors = <span class="Constant">true</span><span class="Delimiter">;</span>
<span id="L351" class="LineNr">351 </span> transform<span class="Delimiter">(</span>
<span id="L352" class="LineNr">352 </span> <span class="Constant">"== code 0x1</span><span class="cSpecial">\n</span><span class="Constant">"</span>
<span id="L353" class="LineNr">353 </span> <span class="Constant">"0xab:</span><span class="cSpecial">\n</span><span class="Constant">"</span>
<span id="L354" class="LineNr">354 </span> <span class="Constant">" 05 0x0d0c0b0a/imm32</span><span class="cSpecial">\n</span><span class="Constant">"</span>
<span id="L355" class="LineNr">355 </span> <span class="Delimiter">);</span>
<span id="L356" class="LineNr">356 </span> <a href='003trace.cc.html#L290'>CHECK_TRACE_CONTENTS</a><span class="Delimiter">(</span>
<span id="L357" class="LineNr">357 </span> <span class="Constant">"error: '0xab' looks like a hex number; use a different <a href='011run.cc.html#L111'>name</a></span><span class="cSpecial">\n</span><span class="Constant">"</span>
<span id="L358" class="LineNr">358 </span> <span class="Delimiter">);</span>
<span id="L359" class="LineNr">359 </span><span class="Delimiter">}</span>
<span id="L360" class="LineNr">360 </span>
<span id="L361" class="LineNr">361 </span><span class="Normal">void</span> <a href='036labels.cc.html#L361'>test_label_negative_hex</a><span class="Delimiter">()</span> <span class="Delimiter">{</span>
<span id="L362" class="LineNr">362 </span> Hide_errors = <span class="Constant">true</span><span class="Delimiter">;</span>
<span id="L363" class="LineNr">363 </span> transform<span class="Delimiter">(</span>
<span id="L364" class="LineNr">364 </span> <span class="Constant">"== code 0x1</span><span class="cSpecial">\n</span><span class="Constant">"</span>
<span id="L365" class="LineNr">365 </span> <span class="Constant">"-a:</span><span class="cSpecial">\n</span><span class="Constant">"</span>
<span id="L366" class="LineNr">366 </span> <span class="Constant">" 05 0x0d0c0b0a/imm32</span><span class="cSpecial">\n</span><span class="Constant">"</span>
<span id="L367" class="LineNr">367 </span> <span class="Delimiter">);</span>
<span id="L368" class="LineNr">368 </span> <a href='003trace.cc.html#L290'>CHECK_TRACE_CONTENTS</a><span class="Delimiter">(</span>
<span id="L369" class="LineNr">369 </span> <span class="Constant">"error: '-a' starts with '-', which can be confused with a negative number; use a different <a href='011run.cc.html#L111'>name</a></span><span class="cSpecial">\n</span><span class="Constant">"</span>
<span id="L370" class="LineNr">370 </span> <span class="Delimiter">);</span>
<span id="L371" class="LineNr">371 </span><span class="Delimiter">}</span>
<span id="L372" class="LineNr">372 </span>
<span id="L373" class="LineNr">373 </span><span class="Comment">//: As said up top, the 'Entry' label is special.</span>
<span id="L374" class="LineNr">374 </span><span class="Comment">//: It can be non-unique; the last declaration overrides earlier ones.</span>
<span id="L375" class="LineNr">375 </span><span class="Comment">//: It must exist in a program. Otherwise we don't know where to start running</span>
<span id="L376" class="LineNr">376 </span><span class="Comment">//: programs.</span>
<span id="L377" class="LineNr">377 </span>
<span id="L378" class="LineNr">378 </span><span class="Normal">void</span> <a href='036labels.cc.html#L378'>test_duplicate_Entry_label</a><span class="Delimiter">()</span> <span class="Delimiter">{</span>
<span id="L379" class="LineNr">379 </span> transform<span class="Delimiter">(</span>
<span id="L380" class="LineNr">380 </span> <span class="Constant">"== code 0x1</span><span class="cSpecial">\n</span><span class="Constant">"</span>
<span id="L381" class="LineNr">381 </span> <span class="Constant">"Entry:</span><span class="cSpecial">\n</span><span class="Constant">"</span>
<span id="L382" class="LineNr">382 </span> <span class="Constant">"Entry:</span><span class="cSpecial">\n</span><span class="Constant">"</span>
<span id="L383" class="LineNr">383 </span> <span class="Constant">" 05 0x0d0c0b0a/imm32</span><span class="cSpecial">\n</span><span class="Constant">"</span>
<span id="L384" class="LineNr">384 </span> <span class="Delimiter">);</span>
<span id="L385" class="LineNr">385 </span> <a href='003trace.cc.html#L304'>CHECK_TRACE_DOESNT_CONTAIN_ERRORS</a><span class="Delimiter">();</span>
<span id="L386" class="LineNr">386 </span><span class="Delimiter">}</span>
<span id="L387" class="LineNr">387 </span>
<span id="L388" class="LineNr">388 </span><span class="Comment">// This test could do with some refactoring.</span>
<span id="L389" class="LineNr">389 </span><span class="Comment">// We're duplicating the flow inside `bootstrap translate`, but without</span>
<span id="L390" class="LineNr">390 </span><span class="Comment">// reading/writing files.</span>
<span id="L391" class="LineNr">391 </span><span class="Comment">// We can't just use run(string) because most of our tests allow programs</span>
<span id="L392" class="LineNr">392 </span><span class="Comment">// without 'Entry' labels, as a convenience.</span>
<span id="L393" class="LineNr">393 </span><span class="Normal">void</span> <a href='036labels.cc.html#L393'>test_programs_without_Entry_label</a><span class="Delimiter">()</span> <span class="Delimiter">{</span>
<span id="L394" class="LineNr">394 </span> Hide_errors = <span class="Constant">true</span><span class="Delimiter">;</span>
<span id="L395" class="LineNr">395 </span> program p<span class="Delimiter">;</span>
<span id="L396" class="LineNr">396 </span> istringstream in<span class="Delimiter">(</span>
<span id="L397" class="LineNr">397 </span> <span class="Constant">"== code 0x1</span><span class="cSpecial">\n</span><span class="Constant">"</span>
<span id="L398" class="LineNr">398 </span> <span class="Constant">"05 0x0d0c0b0a/imm32</span><span class="cSpecial">\n</span><span class="Constant">"</span>
<span id="L399" class="LineNr">399 </span> <span class="Constant">"05 0x0d0c0b0a/imm32</span><span class="cSpecial">\n</span><span class="Constant">"</span>
<span id="L400" class="LineNr">400 </span> <span class="Delimiter">);</span>
<span id="L401" class="LineNr">401 </span> parse<span class="Delimiter">(</span>in<span class="Delimiter">,</span> p<span class="Delimiter">);</span>
<span id="L402" class="LineNr">402 </span> transform<span class="Delimiter">(</span>p<span class="Delimiter">);</span>
<span id="L403" class="LineNr">403 </span> ostringstream dummy<span class="Delimiter">;</span>
<span id="L404" class="LineNr">404 </span> save_elf<span class="Delimiter">(</span>p<span class="Delimiter">,</span> dummy<span class="Delimiter">);</span>
<span id="L405" class="LineNr">405 </span> <a href='003trace.cc.html#L290'>CHECK_TRACE_CONTENTS</a><span class="Delimiter">(</span>
<span id="L406" class="LineNr">406 </span> <span class="Constant">"error: no 'Entry' label found</span><span class="cSpecial">\n</span><span class="Constant">"</span>
<span id="L407" class="LineNr">407 </span> <span class="Delimiter">);</span>
<span id="L408" class="LineNr">408 </span><span class="Delimiter">}</span>
<span id="L409" class="LineNr">409 </span>
<span id="L410" class="LineNr">410 </span><span class="Comment">//: now that we have labels, we need to adjust segment size computation to</span>
<span id="L411" class="LineNr">411 </span><span class="Comment">//: ignore them.</span>
<span id="L412" class="LineNr">412 </span>
<span id="L413" class="LineNr">413 </span><span class="Normal">void</span> <a href='036labels.cc.html#L413'>test_segment_size_ignores_labels</a><span class="Delimiter">()</span> <span class="Delimiter">{</span>
<span id="L414" class="LineNr">414 </span> transform<span class="Delimiter">(</span>
<span id="L415" class="LineNr">415 </span> <span class="Constant">"== code 0x09000074</span><span class="cSpecial">\n</span><span class="Constant">"</span>
<span id="L416" class="LineNr">416 </span> <span class="Constant">" 05/add 0x0d0c0b0a/imm32</span><span class="cSpecial">\n</span><span class="Constant">"</span> <span class="Comment">// 5 bytes</span>
<span id="L417" class="LineNr">417 </span> <span class="Constant">"foo:</span><span class="cSpecial">\n</span><span class="Constant">"</span> <span class="Comment">// 0 bytes</span>
<span id="L418" class="LineNr">418 </span> <span class="Constant">"== data 0x0a000000</span><span class="cSpecial">\n</span><span class="Constant">"</span>
<span id="L419" class="LineNr">419 </span> <span class="Constant">"bar:</span><span class="cSpecial">\n</span><span class="Constant">"</span>
<span id="L420" class="LineNr">420 </span> <span class="Constant">" 00</span><span class="cSpecial">\n</span><span class="Constant">"</span>
<span id="L421" class="LineNr">421 </span> <span class="Delimiter">);</span>
<span id="L422" class="LineNr">422 </span> <a href='003trace.cc.html#L290'>CHECK_TRACE_CONTENTS</a><span class="Delimiter">(</span>
<span id="L423" class="LineNr">423 </span> <span class="Constant">"transform: segment 1 begins at address 0x0a000079</span><span class="cSpecial">\n</span><span class="Constant">"</span>
<span id="L424" class="LineNr">424 </span> <span class="Delimiter">);</span>
<span id="L425" class="LineNr">425 </span><span class="Delimiter">}</span>
<span id="L426" class="LineNr">426 </span>
<span id="L427" class="LineNr">427 </span><span class="Delimiter">:(before "End size_of(<a href='011run.cc.html#L127'>word</a> w) Special-cases")</span>
<span id="L428" class="LineNr">428 </span><span class="Normal">else</span> <span class="Normal">if</span> <span class="Delimiter">(</span><a href='036labels.cc.html#L213'>is_label</a><span class="Delimiter">(</span>w<span class="Delimiter">))</span>
<span id="L429" class="LineNr">429 </span> <span class="Identifier">return</span> <span class="Constant">0</span><span class="Delimiter">;</span>
</pre>
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