4536

author: Kartik Agaram <vc@akkartik.com> 2018-09-07 15:08:54 -0700
committer: Kartik Agaram <vc@akkartik.com> 2018-09-07 15:08:54 -0700
commit: 608a7fa8d0faf9a3e3d182d9eabe969804443aab (patch)
tree: 7e1934d9ef0e8372381c306312591235c4f27110 /html/subx/036global_variables.cc.html
parent: a6517ed821ff39fa56eb3b975799d22497d78a48 (diff)
download: mu-608a7fa8d0faf9a3e3d182d9eabe969804443aab.tar.gz
1 files changed, 178 insertions, 0 deletions
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+<pre id='vimCodeElement'>
+<span id="L1" class="LineNr">  1 </span><span class="Comment">//: Global variables.</span>
+<span id="L2" class="LineNr">  2 </span><span class="Comment">//:</span>
+<span id="L3" class="LineNr">  3 </span><span class="Comment">//: Global variables are just labels in the data segment.</span>
+<span id="L4" class="LineNr">  4 </span><span class="Comment">//: However, they can only be used in imm32 and not disp32 operands. And they</span>
+<span id="L5" class="LineNr">  5 </span><span class="Comment">//: can't be used with jump and call instructions.</span>
+<span id="L6" class="LineNr">  6 </span><span class="Comment">//:</span>
+<span id="L7" class="LineNr">  7 </span><span class="Comment">//: This layer much the same structure as rewriting labels.</span>
+<span id="L8" class="LineNr">  8 </span>
+<span id="L9" class="LineNr">  9 </span><span class="Delimiter">:(scenario global_variable)</span>
+<span id="L10" class="LineNr"> 10 </span><span class="Special">% Mem_offset = CODE_START;</span>
+<span id="L11" class="LineNr"> 11 </span><span class="Special">% Mem.resize(0x2000);</span>
+<span id="L12" class="LineNr"> 12 </span>== <a href='031check_operands.cc.html#L14'>code</a>
+<span id="L13" class="LineNr"> 13 </span>b9/copy x/imm32  <span class="Comment"># copy to ECX</span>
+<span id="L14" class="LineNr"> 14 </span>== <a href='011run.cc.html#L122'>data</a>
+<span id="L15" class="LineNr"> 15 </span><span class="Normal">x</span>:
+<span id="L16" class="LineNr"> 16 </span><span class="PreProc">0</span><span class="Constant">0</span> <span class="PreProc">0</span><span class="Constant">0</span> <span class="PreProc">0</span><span class="Constant">0</span> <span class="PreProc">0</span><span class="Constant">0</span>
+<span id="L17" class="LineNr"> 17 </span><span class="traceContains">+transform: global variable 'x' is at address 0x08049079</span>
+<span id="L18" class="LineNr"> 18 </span>
+<span id="L19" class="LineNr"> 19 </span><span class="Delimiter">:(before &quot;End Level-2 Transforms&quot;)</span>
+<span id="L20" class="LineNr"> 20 </span><a href='011run.cc.html#L191'>Transform</a><span class="Delimiter">.</span>push_back<span class="Delimiter">(</span><a href='036global_variables.cc.html#L22'>rewrite_global_variables</a><span class="Delimiter">);</span>
+<span id="L21" class="LineNr"> 21 </span><span class="Delimiter">:(code)</span>
+<span id="L22" class="LineNr"> 22 </span><span class="Normal">void</span> <a href='036global_variables.cc.html#L22'>rewrite_global_variables</a><span class="Delimiter">(</span>program&amp; p<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L23" class="LineNr"> 23 </span>  <a href='003trace.cc.html#L196'>trace</a><span class="Delimiter">(</span><span class="Constant">99</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;-- rewrite global variables&quot;</span> &lt;&lt; <a href='003trace.cc.html#L222'>end</a><span class="Delimiter">();</span>
+<span id="L24" class="LineNr"> 24 </span>  map&lt;string<span class="Delimiter">,</span> <span class="Normal">uint32_t</span>&gt; address<span class="Delimiter">;</span>
+<span id="L25" class="LineNr"> 25 </span>  compute_addresses_for_global_variables<span class="Delimiter">(</span>p<span class="Delimiter">,</span> address<span class="Delimiter">);</span>
+<span id="L26" class="LineNr"> 26 </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="L27" class="LineNr"> 27 </span>  <a href='036global_variables.cc.html#L60'>drop_global_variables</a><span class="Delimiter">(</span>p<span class="Delimiter">);</span>
+<span id="L28" class="LineNr"> 28 </span>  <a href='036global_variables.cc.html#L65'>replace_global_variables_with_addresses</a><span class="Delimiter">(</span>p<span class="Delimiter">,</span> address<span class="Delimiter">);</span>
+<span id="L29" class="LineNr"> 29 </span><span class="Delimiter">}</span>
+<span id="L30" class="LineNr"> 30 </span>
+<span id="L31" class="LineNr"> 31 </span><span class="Normal">void</span> compute_addresses_for_global_variables<span class="Delimiter">(</span><span class="Normal">const</span> program&amp; p<span class="Delimiter">,</span> map&lt;string<span class="Delimiter">,</span> <span class="Normal">uint32_t</span>&gt;&amp; address<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L32" class="LineNr"> 32 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Comment">/*</span><span class="Comment">skip <a href='031check_operands.cc.html#L14'>code</a> segment</span><span class="Comment">*/</span><span class="Constant">1</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L157'>SIZE</a><span class="Delimiter">(</span>p<span class="Delimiter">.</span><a href='011run.cc.html#L97'>segments</a><span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span>
+<span id="L33" class="LineNr"> 33 </span>    compute_addresses_for_global_variables<span class="Delimiter">(</span>p<span class="Delimiter">.</span><a href='011run.cc.html#L97'>segments</a><span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">),</span> address<span class="Delimiter">);</span>
+<span id="L34" class="LineNr"> 34 </span><span class="Delimiter">}</span>
+<span id="L35" class="LineNr"> 35 </span>
+<span id="L36" class="LineNr"> 36 </span><span class="Normal">void</span> compute_addresses_for_global_variables<span class="Delimiter">(</span><span class="Normal">const</span> segment&amp; s<span class="Delimiter">,</span> map&lt;string<span class="Delimiter">,</span> <span class="Normal">uint32_t</span>&gt;&amp; address<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L37" class="LineNr"> 37 </span>  <span class="Normal">int</span> current_address = s<span class="Delimiter">.</span><a href='011run.cc.html#L105'>start</a><span class="Delimiter">;</span>
+<span id="L38" class="LineNr"> 38 </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 &lt; <a href='001help.cc.html#L157'>SIZE</a><span class="Delimiter">(</span>s<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="L39" class="LineNr"> 39 </span>    <span class="Normal">const</span> line&amp; inst = s<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="L40" class="LineNr"> 40 </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 &lt; <a href='001help.cc.html#L157'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span><a href='011run.cc.html#L115'>words</a><span class="Delimiter">);</span>  ++j<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L41" class="LineNr"> 41 </span>      <span class="Normal">const</span> word&amp; curr = inst<span class="Delimiter">.</span><a href='011run.cc.html#L115'>words</a><span class="Delimiter">.</span>at<span class="Delimiter">(</span>j<span class="Delimiter">);</span>
+<span id="L42" class="LineNr"> 42 </span>      <span class="Normal">if</span> <span class="Delimiter">(</span>*curr<span class="Delimiter">.</span><a href='011run.cc.html#L122'>data</a><span class="Delimiter">.</span>rbegin<span class="Delimiter">()</span> != <span class="Constant">':'</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L43" class="LineNr"> 43 </span>        ++current_address<span class="Delimiter">;</span>
+<span id="L44" class="LineNr"> 44 </span>      <span class="Delimiter">}</span>
+<span id="L45" class="LineNr"> 45 </span>      <span class="Normal">else</span> <span class="Delimiter">{</span>
+<span id="L46" class="LineNr"> 46 </span>        string variable = <a href='035labels.cc.html#L156'>drop_last</a><span class="Delimiter">(</span>curr<span class="Delimiter">.</span><a href='011run.cc.html#L122'>data</a><span class="Delimiter">);</span>
+<span id="L47" class="LineNr"> 47 </span>        <span class="Comment">// ensure variables look sufficiently different from raw hex</span>
+<span id="L48" class="LineNr"> 48 </span>        <a href='035labels.cc.html#L21'>check_valid_name</a><span class="Delimiter">(</span>variable<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#L217'>trace_contains_errors</a><span class="Delimiter">())</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
+<span id="L50" class="LineNr"> 50 </span>        <span class="Normal">if</span> <span class="Delimiter">(</span>j &gt; <span class="Constant">0</span><span class="Delimiter">)</span>
+<span id="L51" class="LineNr"> 51 </span>          <a href='003trace.cc.html#L203'>raise</a> &lt;&lt; <span class="Constant">&quot;'&quot;</span> &lt;&lt; to_string<span class="Delimiter">(</span>inst<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;': global variable names can only be the first <a href='011run.cc.html#L120'>word</a> in a line.</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L222'>end</a><span class="Delimiter">();</span>
+<span id="L52" class="LineNr"> 52 </span>        <a href='001help.cc.html#L243'>put</a><span class="Delimiter">(</span>address<span class="Delimiter">,</span> variable<span class="Delimiter">,</span> current_address<span class="Delimiter">);</span>
+<span id="L53" class="LineNr"> 53 </span>        <a href='003trace.cc.html#L196'>trace</a><span class="Delimiter">(</span><span class="Constant">99</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;global variable '&quot;</span> &lt;&lt; variable &lt;&lt; <span class="Constant">&quot;' is at address 0x&quot;</span> &lt;&lt; <a href='010---vm.cc.html#L260'>HEXWORD</a> &lt;&lt; current_address &lt;&lt; <a href='003trace.cc.html#L222'>end</a><span class="Delimiter">();</span>
+<span id="L54" class="LineNr"> 54 </span>        <span class="Comment">// no modifying current_address; global variable definitions won't be in the final binary</span>
+<span id="L55" class="LineNr"> 55 </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="Delimiter">}</span>
+<span id="L58" class="LineNr"> 58 </span><span class="Delimiter">}</span>
+<span id="L59" class="LineNr"> 59 </span>
+<span id="L60" class="LineNr"> 60 </span><span class="Normal">void</span> <a href='036global_variables.cc.html#L60'>drop_global_variables</a><span class="Delimiter">(</span>program&amp; p<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L61" class="LineNr"> 61 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Comment">/*</span><span class="Comment">skip <a href='031check_operands.cc.html#L14'>code</a> segment</span><span class="Comment">*/</span><span class="Constant">1</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L157'>SIZE</a><span class="Delimiter">(</span>p<span class="Delimiter">.</span><a href='011run.cc.html#L97'>segments</a><span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span>
+<span id="L62" class="LineNr"> 62 </span>    <a href='035labels.cc.html#L100'>drop_labels</a><span class="Delimiter">(</span>p<span class="Delimiter">.</span><a href='011run.cc.html#L97'>segments</a><span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">));</span>
+<span id="L63" class="LineNr"> 63 </span><span class="Delimiter">}</span>
+<span id="L64" class="LineNr"> 64 </span>
+<span id="L65" class="LineNr"> 65 </span><span class="Normal">void</span> <a href='036global_variables.cc.html#L65'>replace_global_variables_with_addresses</a><span class="Delimiter">(</span>program&amp; p<span class="Delimiter">,</span> <span class="Normal">const</span> map&lt;string<span class="Delimiter">,</span> <span class="Normal">uint32_t</span>&gt;&amp; address<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L66" class="LineNr"> 66 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>p<span class="Delimiter">.</span><a href='011run.cc.html#L97'>segments</a><span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
+<span id="L67" class="LineNr"> 67 </span>  segment&amp; <a href='031check_operands.cc.html#L14'>code</a> = p<span class="Delimiter">.</span><a href='011run.cc.html#L97'>segments</a><span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
+<span id="L68" class="LineNr"> 68 </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 &lt; <a href='001help.cc.html#L157'>SIZE</a><span class="Delimiter">(</span><a href='031check_operands.cc.html#L14'>code</a><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="L69" class="LineNr"> 69 </span>    line&amp; inst = <a href='031check_operands.cc.html#L14'>code</a><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="L70" class="LineNr"> 70 </span>    <a href='011run.cc.html#L114'>line</a> new_inst<span class="Delimiter">;</span>
+<span id="L71" class="LineNr"> 71 </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 &lt; <a href='001help.cc.html#L157'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span><a href='011run.cc.html#L115'>words</a><span class="Delimiter">);</span>  ++j<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L72" class="LineNr"> 72 </span>      <span class="Normal">const</span> word&amp; curr = inst<span class="Delimiter">.</span><a href='011run.cc.html#L115'>words</a><span class="Delimiter">.</span>at<span class="Delimiter">(</span>j<span class="Delimiter">);</span>
+<span id="L73" class="LineNr"> 73 </span>      <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L247'>contains_key</a><span class="Delimiter">(</span>address<span class="Delimiter">,</span> curr<span class="Delimiter">.</span><a href='011run.cc.html#L122'>data</a><span class="Delimiter">))</span> <span class="Delimiter">{</span>
+<span id="L74" class="LineNr"> 74 </span>        <span class="Normal">uint32_t</span> value = get<span class="Delimiter">(</span>address<span class="Delimiter">,</span> curr<span class="Delimiter">.</span><a href='011run.cc.html#L122'>data</a><span class="Delimiter">);</span>
+<span id="L75" class="LineNr"> 75 </span>        <span class="Normal">if</span> <span class="Delimiter">(</span>!has_metadata<span class="Delimiter">(</span>curr<span class="Delimiter">,</span> <span class="Constant">&quot;imm32&quot;</span><span class="Delimiter">))</span>
+<span id="L76" class="LineNr"> 76 </span>          <a href='003trace.cc.html#L203'>raise</a> &lt;&lt; <span class="Constant">&quot;'&quot;</span> &lt;&lt; to_string<span class="Delimiter">(</span>inst<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;': <a href='011run.cc.html#L122'>data</a> variables should always be in '/imm32' operands</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L222'>end</a><span class="Delimiter">();</span>
+<span id="L77" class="LineNr"> 77 </span>        emit_hex_bytes<span class="Delimiter">(</span>new_inst<span class="Delimiter">,</span> value<span class="Delimiter">,</span> <span class="Constant">4</span><span class="Delimiter">);</span>
+<span id="L78" class="LineNr"> 78 </span>      <span class="Delimiter">}</span>
+<span id="L79" class="LineNr"> 79 </span>      <span class="Normal">else</span> <span class="Delimiter">{</span>
+<span id="L80" class="LineNr"> 80 </span>        new_inst<span class="Delimiter">.</span><a href='011run.cc.html#L115'>words</a><span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>curr<span class="Delimiter">);</span>
+<span id="L81" class="LineNr"> 81 </span>      <span class="Delimiter">}</span>
+<span id="L82" class="LineNr"> 82 </span>    <span class="Delimiter">}</span>
+<span id="L83" class="LineNr"> 83 </span>    inst<span class="Delimiter">.</span><a href='011run.cc.html#L115'>words</a><span class="Delimiter">.</span>swap<span class="Delimiter">(</span>new_inst<span class="Delimiter">.</span><a href='011run.cc.html#L115'>words</a><span class="Delimiter">);</span>
+<span id="L84" class="LineNr"> 84 </span>    <a href='003trace.cc.html#L196'>trace</a><span class="Delimiter">(</span><span class="Constant">99</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;instruction after <a href='011run.cc.html#L193'>transform</a>: '&quot;</span> &lt;&lt; data_to_string<span class="Delimiter">(</span>inst<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'&quot;</span> &lt;&lt; <a href='003trace.cc.html#L222'>end</a><span class="Delimiter">();</span>
+<span id="L85" class="LineNr"> 85 </span>  <span class="Delimiter">}</span>
+<span id="L86" class="LineNr"> 86 </span><span class="Delimiter">}</span>
+<span id="L87" class="LineNr"> 87 </span>
+<span id="L88" class="LineNr"> 88 </span><span class="Delimiter">:(scenario global_variable_disallowed_in_jump)</span>
+<span id="L89" class="LineNr"> 89 </span><span class="Special">% Mem_offset = CODE_START;</span>
+<span id="L90" class="LineNr"> 90 </span><span class="Special">% Hide_errors = true;</span>
+<span id="L91" class="LineNr"> 91 </span>== <a href='031check_operands.cc.html#L14'>code</a>
+<span id="L92" class="LineNr"> 92 </span>eb/jump x/disp8
+<span id="L93" class="LineNr"> 93 </span>== <a href='011run.cc.html#L122'>data</a>
+<span id="L94" class="LineNr"> 94 </span><span class="Normal">x</span>:
+<span id="L95" class="LineNr"> 95 </span><span class="PreProc">0</span><span class="Constant">0</span> <span class="PreProc">0</span><span class="Constant">0</span> <span class="PreProc">0</span><span class="Constant">0</span> <span class="PreProc">0</span><span class="Constant">0</span>
+<span id="L96" class="LineNr"> 96 </span><span class="traceContains">+error: 'eb/jump x/disp8': <a href='011run.cc.html#L122'>data</a> variables should always be in '/imm32' operands</span>
+<span id="L97" class="LineNr"> 97 </span><span class="Comment"># sub-optimal error message; should be</span>
+<span id="L98" class="LineNr"> 98 </span><span class="CommentedCode">#? +error: can't jump to data (variable 'x')</span>
+<span id="L99" class="LineNr"> 99 </span>
+<span id="L100" class="LineNr">100 </span><span class="Delimiter">:(scenario global_variable_disallowed_in_call)</span>
+<span id="L101" class="LineNr">101 </span><span class="Special">% Mem_offset = CODE_START;</span>
+<span id="L102" class="LineNr">102 </span><span class="Special">% Hide_errors = true;</span>
+<span id="L103" class="LineNr">103 </span>== <a href='031check_operands.cc.html#L14'>code</a>
+<span id="L104" class="LineNr">104 </span>e8/call x/disp32
+<span id="L105" class="LineNr">105 </span>== <a href='011run.cc.html#L122'>data</a>
+<span id="L106" class="LineNr">106 </span><span class="Normal">x</span>:
+<span id="L107" class="LineNr">107 </span><span class="PreProc">0</span><span class="Constant">0</span> <span class="PreProc">0</span><span class="Constant">0</span> <span class="PreProc">0</span><span class="Constant">0</span> <span class="PreProc">0</span><span class="Constant">0</span>
+<span id="L108" class="LineNr">108 </span><span class="traceContains">+error: 'e8/call x/disp32': <a href='011run.cc.html#L122'>data</a> variables should always be in '/imm32' operands</span>
+<span id="L109" class="LineNr">109 </span><span class="Comment"># sub-optimal error message; should be</span>
+<span id="L110" class="LineNr">110 </span><span class="CommentedCode">#? +error: can't call a data variable ('x')</span>
+<span id="L111" class="LineNr">111 </span><span class="Comment"># also, what about function pointers?</span>
+</pre>
+</body>
+</html>
+<!-- vim: set foldmethod=manual : -->
author	Kartik Agaram <vc@akkartik.com>	2018-09-07 15:08:54 -0700
committer	Kartik Agaram <vc@akkartik.com>	2018-09-07 15:08:54 -0700
commit	608a7fa8d0faf9a3e3d182d9eabe969804443aab (patch)
tree	7e1934d9ef0e8372381c306312591235c4f27110 /html/subx/036global_variables.cc.html
parent	a6517ed821ff39fa56eb3b975799d22497d78a48 (diff)
download	mu-608a7fa8d0faf9a3e3d182d9eabe969804443aab.tar.gz