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<pre id='vimCodeElement'>
<span id="L1" class="LineNr"> 1 </span><span class="Comment">//: Make sure that we never jump from one function to within another.</span>
<span id="L2" class="LineNr"> 2 </span><span class="Comment">//:</span>
<span id="L3" class="LineNr"> 3 </span><span class="Comment">//: (The check for label types already ensures we can't jump to the start of</span>
<span id="L4" class="LineNr"> 4 </span><span class="Comment">//: another function.)</span>
<span id="L5" class="LineNr"> 5 </span>
<span id="L6" class="LineNr"> 6 </span><span class="Delimiter">:(scenario jump_to_different_function)</span>
<span id="L7" class="LineNr"> 7 </span><span class="Special">% Hide_errors = true;</span>
<span id="L8" class="LineNr"> 8 </span>== <span class="Constant">0x1</span>
<span id="L9" class="LineNr"> 9 </span><span class="Normal">fn1</span>:
<span id="L10" class="LineNr">10 </span> 7e/jump-<span class="Normal">if</span> $target/disp8
<span id="L11" class="LineNr">11 </span><span class="Normal">fn2</span>:
<span id="L12" class="LineNr">12 </span> $target:
<span id="L13" class="LineNr">13 </span><span class="traceContains">+error: '7e/jump-if $target/disp8' in function 'fn1': jump to within another function 'fn2' is a *really* bad idea</span>
<span id="L14" class="LineNr">14 </span>
<span id="L15" class="LineNr">15 </span><span class="Delimiter">:(before "Rewrite Labels(segment code)")</span>
<span id="L16" class="LineNr">16 </span><a href='038check_local_jumps.cc.html#L19'>check_local_jumps</a><span class="Delimiter">(</span>code<span class="Delimiter">);</span>
<span id="L17" class="LineNr">17 </span><span class="Normal">if</span> <span class="Delimiter">(</span><a href='003trace.cc.html#L217'>trace_contains_errors</a><span class="Delimiter">())</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
<span id="L18" class="LineNr">18 </span><span class="Delimiter">:(code)</span>
<span id="L19" class="LineNr">19 </span><span class="Normal">void</span> <a href='038check_local_jumps.cc.html#L19'>check_local_jumps</a><span class="Delimiter">(</span><span class="Normal">const</span> segment& code<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L20" class="LineNr">20 </span> map<<span class="Comment">/*</span><span class="Comment">jump target</span><span class="Comment">*/</span>string<span class="Delimiter">,</span> <span class="Comment">/*</span><span class="Comment">containing call target</span><span class="Comment">*/</span>string> function<span class="Delimiter">;</span>
<span id="L21" class="LineNr">21 </span> <a href='038check_local_jumps.cc.html#L41'>compute_function_target</a><span class="Delimiter">(</span>code<span class="Delimiter">,</span> function<span class="Delimiter">);</span>
<span id="L22" class="LineNr">22 </span> <span class="Normal">if</span> <span class="Delimiter">(</span><a href='003trace.cc.html#L217'>trace_contains_errors</a><span class="Delimiter">())</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
<span id="L23" class="LineNr">23 </span> string current_function<span class="Delimiter">;</span>
<span id="L24" class="LineNr">24 </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#L157'>SIZE</a><span class="Delimiter">(</span>code<span class="Delimiter">.</span><a href='011run.cc.html#L106'>lines</a><span class="Delimiter">);</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L25" class="LineNr">25 </span> <span class="Normal">const</span> line& inst = code<span class="Delimiter">.</span><a href='011run.cc.html#L106'>lines</a><span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
<span id="L26" class="LineNr">26 </span> <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L157'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span><a href='011run.cc.html#L111'>words</a><span class="Delimiter">)</span> == <span class="Constant">1</span> && <a href='035labels.cc.html#L115'>is_label</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span><a href='011run.cc.html#L111'>words</a><span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)))</span> <span class="Delimiter">{</span>
<span id="L27" class="LineNr">27 </span> <span class="Comment">// label definition</span>
<span id="L28" class="LineNr">28 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>inst<span class="Delimiter">.</span><a href='011run.cc.html#L111'>words</a><span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span><a href='011run.cc.html#L118'>data</a><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="L29" class="LineNr">29 </span> current_function = <a href='035labels.cc.html#L176'>drop_last</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span><a href='011run.cc.html#L111'>words</a><span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span><a href='011run.cc.html#L118'>data</a><span class="Delimiter">);</span>
<span id="L30" class="LineNr">30 </span> <span class="Delimiter">}</span>
<span id="L31" class="LineNr">31 </span> <span class="Normal">else</span> <span class="Normal">if</span> <span class="Delimiter">(</span><a href='036recommend_labels.cc.html#L37'>is_jump</a><span class="Delimiter">(</span>inst<span class="Delimiter">))</span> <span class="Delimiter">{</span>
<span id="L32" class="LineNr">32 </span> <span class="Normal">const</span> word& target = inst<span class="Delimiter">.</span><a href='011run.cc.html#L111'>words</a><span class="Delimiter">.</span>at<span class="Delimiter">(</span><a href='031check_operands.cc.html#L276'>first_operand</a><span class="Delimiter">(</span>inst<span class="Delimiter">));</span>
<span id="L33" class="LineNr">33 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>!contains_key<span class="Delimiter">(</span>function<span class="Delimiter">,</span> target<span class="Delimiter">.</span><a href='011run.cc.html#L118'>data</a><span class="Delimiter">))</span> <span class="Identifier">continue</span><span class="Delimiter">;</span> <span class="Comment">// error/warning handled elsewhere</span>
<span id="L34" class="LineNr">34 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>get<span class="Delimiter">(</span>function<span class="Delimiter">,</span> target<span class="Delimiter">.</span><a href='011run.cc.html#L118'>data</a><span class="Delimiter">)</span> == current_function<span class="Delimiter">)</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
<span id="L35" class="LineNr">35 </span> <a href='003trace.cc.html#L203'>raise</a> << <span class="Constant">"'"</span> << to_string<span class="Delimiter">(</span>inst<span class="Delimiter">)</span> << <span class="Constant">"' in function '"</span> << current_function << <span class="Constant">"': jump to within another function '"</span> << get<span class="Delimiter">(</span>function<span class="Delimiter">,</span> target<span class="Delimiter">.</span>data<span class="Delimiter">)</span> << <span class="Constant">"' is a *really* bad idea</span><span class="cSpecial">\n</span><span class="Constant">"</span> << <a href='003trace.cc.html#L222'>end</a><span class="Delimiter">();</span>
<span id="L36" class="LineNr">36 </span> <span class="Identifier">return</span><span class="Delimiter">;</span>
<span id="L37" class="LineNr">37 </span> <span class="Delimiter">}</span>
<span id="L38" class="LineNr">38 </span> <span class="Delimiter">}</span>
<span id="L39" class="LineNr">39 </span><span class="Delimiter">}</span>
<span id="L40" class="LineNr">40 </span>
<span id="L41" class="LineNr">41 </span><span class="Normal">void</span> <a href='038check_local_jumps.cc.html#L41'>compute_function_target</a><span class="Delimiter">(</span><span class="Normal">const</span> segment& code<span class="Delimiter">,</span> map<string<span class="Delimiter">,</span> string>& out<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L42" class="LineNr">42 </span> string current_function<span class="Delimiter">;</span>
<span id="L43" class="LineNr">43 </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#L157'>SIZE</a><span class="Delimiter">(</span>code<span class="Delimiter">.</span><a href='011run.cc.html#L106'>lines</a><span class="Delimiter">);</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L44" class="LineNr">44 </span> <span class="Normal">const</span> line& inst = code<span class="Delimiter">.</span><a href='011run.cc.html#L106'>lines</a><span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
<span id="L45" class="LineNr">45 </span> <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L157'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span><a href='011run.cc.html#L111'>words</a><span class="Delimiter">)</span> != <span class="Constant">1</span><span class="Delimiter">)</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
<span id="L46" class="LineNr">46 </span> <span class="Normal">const</span> word& curr = inst<span class="Delimiter">.</span><a href='011run.cc.html#L111'>words</a><span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
<span id="L47" class="LineNr">47 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>!is_label<span class="Delimiter">(</span>curr<span class="Delimiter">))</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
<span id="L48" class="LineNr">48 </span> <span class="Normal">const</span> string& <a href='003trace.cc.html#L73'>label</a> = <a href='035labels.cc.html#L176'>drop_last</a><span class="Delimiter">(</span>curr<span class="Delimiter">.</span><a href='011run.cc.html#L118'>data</a><span class="Delimiter">);</span>
<span id="L49" class="LineNr">49 </span> <span class="Normal">if</span> <span class="Delimiter">(</span><a href='003trace.cc.html#L73'>label</a><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 class="Delimiter">{</span>
<span id="L50" class="LineNr">50 </span> current_function = <a href='003trace.cc.html#L73'>label</a><span class="Delimiter">;</span>
<span id="L51" class="LineNr">51 </span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
<span id="L52" class="LineNr">52 </span> <span class="Delimiter">}</span>
<span id="L53" class="LineNr">53 </span> <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L247'>contains_key</a><span class="Delimiter">(</span>out<span class="Delimiter">,</span> <a href='003trace.cc.html#L73'>label</a><span class="Delimiter">))</span> <span class="Delimiter">{</span>
<span id="L54" class="LineNr">54 </span> <a href='003trace.cc.html#L203'>raise</a> << <span class="Constant">"duplicate <a href='003trace.cc.html#L73'>label</a> '"</span> << label << <span class="Constant">"'</span><span class="cSpecial">\n</span><span class="Constant">"</span> << <a href='003trace.cc.html#L222'>end</a><span class="Delimiter">();</span>
<span id="L55" class="LineNr">55 </span> <span class="Identifier">return</span><span class="Delimiter">;</span>
<span id="L56" class="LineNr">56 </span> <span class="Delimiter">}</span>
<span id="L57" class="LineNr">57 </span> <span class="Comment">// current_function can be empty! if so that would be 'main'.</span>
<span id="L58" class="LineNr">58 </span> <a href='001help.cc.html#L243'>put</a><span class="Delimiter">(</span>out<span class="Delimiter">,</span> <a href='003trace.cc.html#L73'>label</a><span class="Delimiter">,</span> current_function<span class="Delimiter">);</span>
<span id="L59" class="LineNr">59 </span> <span class="Delimiter">}</span>
<span id="L60" class="LineNr">60 </span><span class="Delimiter">}</span>
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