4447

author: Kartik Agaram <vc@akkartik.com> 2018-07-27 17:07:52 -0700
committer: Kartik Agaram <vc@akkartik.com> 2018-07-27 17:08:29 -0700
commit: 5fe060d582d4a82444243a28b18085c971a85628 (patch)
tree: 7a13eb020d0a9cab5d4195da931a373f575229ab /html/subx/023check_operand_bounds.cc.html
parent: 013d95266d563a3f531c13eba6d2a6bfe18f8808 (diff)
download: mu-5fe060d582d4a82444243a28b18085c971a85628.tar.gz
1 files changed, 141 insertions, 0 deletions
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+<pre id='vimCodeElement'>
+<span id="L1" class="LineNr"> 1 </span><span class="SalientComment">//:: Check that the different operands of an instruction aren't too large for their bitfields.</span>
+<span id="L2" class="LineNr"> 2 </span>
+<span id="L3" class="LineNr"> 3 </span><span class="Delimiter">:(scenario check_bitfield_sizes)</span>
+<span id="L4" class="LineNr"> 4 </span><span class="Special">% Hide_errors = true;</span>
+<span id="L5" class="LineNr"> 5 </span>== <span class="Constant">0x1</span>
+<span id="L6" class="LineNr"> 6 </span><span class="PreProc">0</span><span class="Constant">1</span>/add <span class="Constant">4</span>/mod
+<span id="L7" class="LineNr"> 7 </span><span class="traceContains">+error: '4/mod' too large to fit in bitfield mod</span>
+<span id="L8" class="LineNr"> 8 </span>
+<span id="L9" class="LineNr"> 9 </span><span class="Delimiter">:(before &quot;End Globals&quot;)</span>
+<span id="L10" class="LineNr">10 </span>map&lt;string<span class="Delimiter">,</span> <span class="Normal">uint32_t</span>&gt; <a href='023check_operand_bounds.cc.html#L10'>Operand_bound</a><span class="Delimiter">;</span>
+<span id="L11" class="LineNr">11 </span><span class="Delimiter">:(before &quot;End One-time Setup&quot;)</span>
+<span id="L12" class="LineNr">12 </span><a href='001help.cc.html#L243'>put</a><span class="Delimiter">(</span><a href='023check_operand_bounds.cc.html#L10'>Operand_bound</a><span class="Delimiter">,</span> <span class="Constant">&quot;subop&quot;</span><span class="Delimiter">,</span> <span class="Constant">1</span>&lt;&lt;<span class="Constant">3</span><span class="Delimiter">);</span>
+<span id="L13" class="LineNr">13 </span><a href='001help.cc.html#L243'>put</a><span class="Delimiter">(</span><a href='023check_operand_bounds.cc.html#L10'>Operand_bound</a><span class="Delimiter">,</span> <span class="Constant">&quot;mod&quot;</span><span class="Delimiter">,</span> <span class="Constant">1</span>&lt;&lt;<span class="Constant">2</span><span class="Delimiter">);</span>
+<span id="L14" class="LineNr">14 </span><a href='001help.cc.html#L243'>put</a><span class="Delimiter">(</span><a href='023check_operand_bounds.cc.html#L10'>Operand_bound</a><span class="Delimiter">,</span> <span class="Constant">&quot;rm32&quot;</span><span class="Delimiter">,</span> <span class="Constant">1</span>&lt;&lt;<span class="Constant">3</span><span class="Delimiter">);</span>
+<span id="L15" class="LineNr">15 </span><a href='001help.cc.html#L243'>put</a><span class="Delimiter">(</span><a href='023check_operand_bounds.cc.html#L10'>Operand_bound</a><span class="Delimiter">,</span> <span class="Constant">&quot;base&quot;</span><span class="Delimiter">,</span> <span class="Constant">1</span>&lt;&lt;<span class="Constant">3</span><span class="Delimiter">);</span>
+<span id="L16" class="LineNr">16 </span><a href='001help.cc.html#L243'>put</a><span class="Delimiter">(</span><a href='023check_operand_bounds.cc.html#L10'>Operand_bound</a><span class="Delimiter">,</span> <span class="Constant">&quot;index&quot;</span><span class="Delimiter">,</span> <span class="Constant">1</span>&lt;&lt;<span class="Constant">3</span><span class="Delimiter">);</span>
+<span id="L17" class="LineNr">17 </span><a href='001help.cc.html#L243'>put</a><span class="Delimiter">(</span><a href='023check_operand_bounds.cc.html#L10'>Operand_bound</a><span class="Delimiter">,</span> <span class="Constant">&quot;scale&quot;</span><span class="Delimiter">,</span> <span class="Constant">1</span>&lt;&lt;<span class="Constant">2</span><span class="Delimiter">);</span>
+<span id="L18" class="LineNr">18 </span><a href='001help.cc.html#L243'>put</a><span class="Delimiter">(</span><a href='023check_operand_bounds.cc.html#L10'>Operand_bound</a><span class="Delimiter">,</span> <span class="Constant">&quot;r32&quot;</span><span class="Delimiter">,</span> <span class="Constant">1</span>&lt;&lt;<span class="Constant">3</span><span class="Delimiter">);</span>
+<span id="L19" class="LineNr">19 </span><a href='001help.cc.html#L243'>put</a><span class="Delimiter">(</span><a href='023check_operand_bounds.cc.html#L10'>Operand_bound</a><span class="Delimiter">,</span> <span class="Constant">&quot;disp8&quot;</span><span class="Delimiter">,</span> <span class="Constant">1</span>&lt;&lt;<span class="Constant">8</span><span class="Delimiter">);</span>
+<span id="L20" class="LineNr">20 </span><a href='001help.cc.html#L243'>put</a><span class="Delimiter">(</span><a href='023check_operand_bounds.cc.html#L10'>Operand_bound</a><span class="Delimiter">,</span> <span class="Constant">&quot;disp16&quot;</span><span class="Delimiter">,</span> <span class="Constant">1</span>&lt;&lt;<span class="Constant">16</span><span class="Delimiter">);</span>
+<span id="L21" class="LineNr">21 </span><span class="Comment">// no bound needed for disp32</span>
+<span id="L22" class="LineNr">22 </span><a href='001help.cc.html#L243'>put</a><span class="Delimiter">(</span><a href='023check_operand_bounds.cc.html#L10'>Operand_bound</a><span class="Delimiter">,</span> <span class="Constant">&quot;imm8&quot;</span><span class="Delimiter">,</span> <span class="Constant">1</span>&lt;&lt;<span class="Constant">8</span><span class="Delimiter">);</span>
+<span id="L23" class="LineNr">23 </span><span class="Comment">// no bound needed for imm32</span>
+<span id="L24" class="LineNr">24 </span>
+<span id="L25" class="LineNr">25 </span><span class="Delimiter">:(before &quot;End One-time Setup&quot;)</span>
+<span id="L26" class="LineNr">26 </span><a href='011run.cc.html#L184'>Transform</a><span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>check_operand_bounds<span class="Delimiter">);</span>
+<span id="L27" class="LineNr">27 </span><span class="Delimiter">:(code)</span>
+<span id="L28" class="LineNr">28 </span><span class="Normal">void</span> check_operand_bounds<span class="Delimiter">(</span><span class="Comment">/*</span><span class="Comment">const</span><span class="Comment">*/</span> program&amp; p<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L29" class="LineNr">29 </span>  <a href='003trace.cc.html#L189'>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;-- check operand bounds&quot;</span> &lt;&lt; <a href='003trace.cc.html#L213'>end</a><span class="Delimiter">();</span>
+<span id="L30" class="LineNr">30 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>p<span class="Delimiter">.</span><a href='011run.cc.html#L95'>segments</a><span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
+<span id="L31" class="LineNr">31 </span>  <span class="Normal">const</span> segment&amp; code = p<span class="Delimiter">.</span><a href='011run.cc.html#L95'>segments</a><span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</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="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L157'>SIZE</a><span class="Delimiter">(</span>code<span class="Delimiter">.</span><a href='011run.cc.html#L104'>lines</a><span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L33" class="LineNr">33 </span>    <span class="Normal">const</span> line&amp; inst = code<span class="Delimiter">.</span><a href='011run.cc.html#L104'>lines</a><span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
+<span id="L34" class="LineNr">34 </span>    <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> j = <a href='022check_instruction.cc.html#L326'>first_operand</a><span class="Delimiter">(</span>inst<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#L109'>words</a><span class="Delimiter">);</span>  ++j<span class="Delimiter">)</span>
+<span id="L35" class="LineNr">35 </span>      check_operand_bounds<span class="Delimiter">(</span>inst<span class="Delimiter">.</span><a href='011run.cc.html#L109'>words</a><span class="Delimiter">.</span>at<span class="Delimiter">(</span>j<span class="Delimiter">));</span>
+<span id="L36" class="LineNr">36 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span><a href='003trace.cc.html#L208'>trace_contains_errors</a><span class="Delimiter">())</span> <span class="Identifier">return</span><span class="Delimiter">;</span>  <span class="Comment">// stop at the first mal-formed instruction</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 id="L40" class="LineNr">40 </span><span class="Normal">void</span> check_operand_bounds<span class="Delimiter">(</span><span class="Normal">const</span> word&amp; w<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L41" class="LineNr">41 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span>map&lt;string<span class="Delimiter">,</span> <span class="Normal">uint32_t</span>&gt;::iterator p = <a href='023check_operand_bounds.cc.html#L10'>Operand_bound</a><span class="Delimiter">.</span>begin<span class="Delimiter">();</span>  p != <a href='023check_operand_bounds.cc.html#L10'>Operand_bound</a><span class="Delimiter">.</span><a href='003trace.cc.html#L213'>end</a><span class="Delimiter">();</span>  ++p<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L42" class="LineNr">42 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>!has_metadata<span class="Delimiter">(</span>w<span class="Delimiter">,</span> p<span class="Delimiter">-&gt;</span>first<span class="Delimiter">))</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
+<span id="L43" class="LineNr">43 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>!is_hex_int<span class="Delimiter">(</span>w<span class="Delimiter">.</span><a href='011run.cc.html#L115'>data</a><span class="Delimiter">))</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>  <span class="Comment">// later transforms are on their own to do their own bounds checking</span>
+<span id="L44" class="LineNr">44 </span>    <span class="Normal">int32_t</span> x = <a href='023check_operand_bounds.cc.html#L65'>parse_int</a><span class="Delimiter">(</span>w<span class="Delimiter">.</span><a href='011run.cc.html#L115'>data</a><span class="Delimiter">);</span>
+<span id="L45" class="LineNr">45 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>x &gt;= <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L46" class="LineNr">46 </span>      <span class="Normal">if</span> <span class="Delimiter">(</span><span class="Normal">static_cast</span>&lt;<span class="Normal">uint32_t</span>&gt;<span class="Delimiter">(</span>x<span class="Delimiter">)</span> &gt;= p<span class="Delimiter">-&gt;</span>second<span class="Delimiter">)</span>
+<span id="L47" class="LineNr">47 </span>        <a href='003trace.cc.html#L196'>raise</a> &lt;&lt; <span class="Constant">&quot;'&quot;</span> &lt;&lt; w<span class="Delimiter">.</span>original &lt;&lt; <span class="Constant">&quot;' too large to fit in bitfield &quot;</span> &lt;&lt; p<span class="Delimiter">-&gt;</span>first &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; <a href='003trace.cc.html#L213'>end</a><span class="Delimiter">();</span>
+<span id="L48" class="LineNr">48 </span>    <span class="Delimiter">}</span>
+<span id="L49" class="LineNr">49 </span>    <span class="Normal">else</span> <span class="Delimiter">{</span>
+<span id="L50" class="LineNr">50 </span>      <span class="Comment">// hacky? assuming bound is a power of 2</span>
+<span id="L51" class="LineNr">51 </span>      <span class="Normal">if</span> <span class="Delimiter">(</span>x &lt; -<span class="Constant">1</span>*<span class="Normal">static_cast</span>&lt;<span class="Normal">int32_t</span>&gt;<span class="Delimiter">(</span>p<span class="Delimiter">-&gt;</span>second/<span class="Constant">2</span><span class="Delimiter">))</span>
+<span id="L52" class="LineNr">52 </span>        <a href='003trace.cc.html#L196'>raise</a> &lt;&lt; <span class="Constant">&quot;'&quot;</span> &lt;&lt; w<span class="Delimiter">.</span>original &lt;&lt; <span class="Constant">&quot;' too large to fit in bitfield &quot;</span> &lt;&lt; p<span class="Delimiter">-&gt;</span>first &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; <a href='003trace.cc.html#L213'>end</a><span class="Delimiter">();</span>
+<span id="L53" class="LineNr">53 </span>    <span class="Delimiter">}</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">bool</span> <a href='023check_operand_bounds.cc.html#L57'>is_hex_int</a><span class="Delimiter">(</span><span class="Normal">const</span> string&amp; s<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L58" class="LineNr">58 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>s<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Identifier">return</span><span class="Constant"> false</span><span class="Delimiter">;</span>
+<span id="L59" class="LineNr">59 </span>  <span class="Normal">size_t</span> pos = <span class="Constant">0</span><span class="Delimiter">;</span>
+<span id="L60" class="LineNr">60 </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> || 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> pos++<span class="Delimiter">;</span>
+<span id="L61" class="LineNr">61 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>s<span class="Delimiter">.</span>substr<span class="Delimiter">(</span>pos<span class="Delimiter">,</span> pos+<span class="Constant">2</span><span class="Delimiter">)</span> == <span class="Constant">&quot;0x&quot;</span><span class="Delimiter">)</span> pos += <span class="Constant">2</span><span class="Delimiter">;</span>
+<span id="L62" class="LineNr">62 </span>  <span class="Identifier">return</span> s<span class="Delimiter">.</span>find_first_not_of<span class="Delimiter">(</span><span class="Constant">&quot;0123456789abcdefABCDEF&quot;</span><span class="Delimiter">,</span> pos<span class="Delimiter">)</span> == string::npos<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">int32_t</span> <a href='023check_operand_bounds.cc.html#L65'>parse_int</a><span class="Delimiter">(</span><span class="Normal">const</span> string&amp; s<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L66" class="LineNr">66 </span>  istringstream in<span class="Delimiter">(</span>s<span class="Delimiter">);</span>
+<span id="L67" class="LineNr">67 </span>  <span class="Normal">int32_t</span> result = <span class="Constant">0</span><span class="Delimiter">;</span>
+<span id="L68" class="LineNr">68 </span>  in &gt;&gt; std::hex &gt;&gt; result<span class="Delimiter">;</span>
+<span id="L69" class="LineNr">69 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!in || !in<span class="Delimiter">.</span>eof<span class="Delimiter">())</span> <span class="Delimiter">{</span>
+<span id="L70" class="LineNr">70 </span>    <a href='003trace.cc.html#L196'>raise</a> &lt;&lt; <span class="Constant">&quot;not a number: &quot;</span> &lt;&lt; s &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; <a href='003trace.cc.html#L213'>end</a><span class="Delimiter">();</span>
+<span id="L71" class="LineNr">71 </span>    <span class="Identifier">return</span> <span class="Constant">0</span><span class="Delimiter">;</span>
+<span id="L72" class="LineNr">72 </span>  <span class="Delimiter">}</span>
+<span id="L73" class="LineNr">73 </span>  <span class="Identifier">return</span> result<span class="Delimiter">;</span>
+<span id="L74" class="LineNr">74 </span><span class="Delimiter">}</span>
+</pre>
+</body>
+</html>
+<!-- vim: set foldmethod=manual : -->
author	Kartik Agaram <vc@akkartik.com>	2018-07-27 17:07:52 -0700
committer	Kartik Agaram <vc@akkartik.com>	2018-07-27 17:08:29 -0700
commit	5fe060d582d4a82444243a28b18085c971a85628 (patch)
tree	7a13eb020d0a9cab5d4195da931a373f575229ab /html/subx/023check_operand_bounds.cc.html
parent	013d95266d563a3f531c13eba6d2a6bfe18f8808 (diff)
download	mu-5fe060d582d4a82444243a28b18085c971a85628.tar.gz