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<h1>Source code for Lib.Terminator</h1><div class="highlight"><pre>
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<span></span><span class="sd">"""</span>
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<span class="sd">MIF08, CAP, CFG library - Terminators.</span>
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<span class="sd">Each :py:class:`block <Lib.CFG.Block>` of a :py:class:`CFG <Lib.CFG.CFG>`</span>
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<span class="sd">ends with a branching instruction called a terminator.</span>
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<span class="sd">There are three kinds of terminators:</span>
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<span class="sd">- :py:class:`Lib.Statement.AbsoluteJump` is a non-conditional jump</span>
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<span class="sd"> to another block of the CFG</span>
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<span class="sd">- :py:class:`BranchingTerminator` is a conditional branching</span>
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<span class="sd"> instruction with two successor blocks.</span>
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<span class="sd"> Unlike the class :py:class:`ConditionalJump <Lib.Statement.ConditionalJump>`</span>
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<span class="sd"> that was used in :py:class:`LinearCode <Lib.LinearCode.LinearCode>`,</span>
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<span class="sd"> both successor labels have to be specified.</span>
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<span class="sd">- :py:class:`Return` marks the end of the function</span>
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<span class="sd">During the construction of the CFG, :py:func:`jump2terminator` builds</span>
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<span class="sd">a terminator for each extracted chunk of instructions.</span>
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<span class="sd">"""</span>
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<span class="kn">from</span> <span class="nn">dataclasses</span> <span class="kn">import</span> <span class="n">dataclass</span>
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<span class="kn">from</span> <span class="nn">typing</span> <span class="kn">import</span> <span class="n">List</span><span class="p">,</span> <span class="n">Dict</span>
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<span class="kn">from</span> <span class="nn">Lib.Errors</span> <span class="kn">import</span> <span class="n">MiniCInternalError</span>
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<span class="kn">from</span> <span class="nn">Lib.Operands</span> <span class="kn">import</span> <span class="n">Operand</span><span class="p">,</span> <span class="n">Renamer</span><span class="p">,</span> <span class="n">Temporary</span><span class="p">,</span> <span class="n">Condition</span>
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<span class="kn">from</span> <span class="nn">Lib.Statement</span> <span class="kn">import</span> <span class="n">AbsoluteJump</span><span class="p">,</span> <span class="n">ConditionalJump</span><span class="p">,</span> <span class="n">Instruction</span><span class="p">,</span> <span class="n">Label</span><span class="p">,</span> <span class="n">Statement</span>
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<div class="viewcode-block" id="Return"><a class="viewcode-back" href="../../api/Lib.Terminator.html#Lib.Terminator.Return">[docs]</a><span class="nd">@dataclass</span><span class="p">(</span><span class="n">unsafe_hash</span><span class="o">=</span><span class="kc">True</span><span class="p">)</span>
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<span class="k">class</span> <span class="nc">Return</span><span class="p">(</span><span class="n">Statement</span><span class="p">):</span>
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<span class="w"> </span><span class="sd">"""A terminator that marks the end of the function."""</span>
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<span class="k">def</span> <span class="fm">__str__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
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<span class="k">return</span> <span class="p">(</span><span class="s2">"return"</span><span class="p">)</span>
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<div class="viewcode-block" id="Return.printIns"><a class="viewcode-back" href="../../api/Lib.Terminator.html#Lib.Terminator.Return.printIns">[docs]</a> <span class="k">def</span> <span class="nf">printIns</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">stream</span><span class="p">):</span>
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<span class="nb">print</span><span class="p">(</span><span class="s2">"return"</span><span class="p">,</span> <span class="n">file</span><span class="o">=</span><span class="n">stream</span><span class="p">)</span></div>
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<div class="viewcode-block" id="Return.targets"><a class="viewcode-back" href="../../api/Lib.Terminator.html#Lib.Terminator.Return.targets">[docs]</a> <span class="k">def</span> <span class="nf">targets</span><span class="p">(</span><span class="bp">self</span><span class="p">)</span> <span class="o">-></span> <span class="n">List</span><span class="p">[</span><span class="n">Label</span><span class="p">]:</span>
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<span class="w"> </span><span class="sd">"""Return the labels targetted by the Return terminator."""</span>
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<span class="k">return</span> <span class="p">[]</span></div>
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<div class="viewcode-block" id="Return.args"><a class="viewcode-back" href="../../api/Lib.Terminator.html#Lib.Terminator.Return.args">[docs]</a> <span class="k">def</span> <span class="nf">args</span><span class="p">(</span><span class="bp">self</span><span class="p">)</span> <span class="o">-></span> <span class="n">List</span><span class="p">[</span><span class="n">Operand</span><span class="p">]:</span>
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<span class="k">return</span> <span class="p">[]</span></div>
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<div class="viewcode-block" id="Return.rename"><a class="viewcode-back" href="../../api/Lib.Terminator.html#Lib.Terminator.Return.rename">[docs]</a> <span class="k">def</span> <span class="nf">rename</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">renamer</span><span class="p">:</span> <span class="n">Renamer</span><span class="p">):</span>
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<span class="k">pass</span></div>
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<div class="viewcode-block" id="Return.substitute"><a class="viewcode-back" href="../../api/Lib.Terminator.html#Lib.Terminator.Return.substitute">[docs]</a> <span class="k">def</span> <span class="nf">substitute</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">subst</span><span class="p">:</span> <span class="n">Dict</span><span class="p">[</span><span class="n">Operand</span><span class="p">,</span> <span class="n">Operand</span><span class="p">]):</span>
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<span class="k">if</span> <span class="n">subst</span> <span class="o">!=</span> <span class="p">{}:</span>
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<span class="k">raise</span> <span class="ne">Exception</span><span class="p">(</span>
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<span class="s2">"substitute: No possible substitution on instruction </span><span class="si">{}</span><span class="s2">"</span>
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<span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="bp">self</span><span class="p">))</span>
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<span class="k">return</span> <span class="bp">self</span></div>
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<div class="viewcode-block" id="Return.with_args"><a class="viewcode-back" href="../../api/Lib.Terminator.html#Lib.Terminator.Return.with_args">[docs]</a> <span class="k">def</span> <span class="nf">with_args</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">new_args</span><span class="p">:</span> <span class="n">List</span><span class="p">[</span><span class="n">Operand</span><span class="p">]):</span>
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<span class="k">if</span> <span class="n">new_args</span> <span class="o">!=</span> <span class="p">[]:</span>
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<span class="k">raise</span> <span class="ne">Exception</span><span class="p">(</span>
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<span class="s2">"substitute: No possible substitution on instruction </span><span class="si">{}</span><span class="s2">"</span>
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<span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="bp">self</span><span class="p">))</span>
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<span class="k">return</span> <span class="bp">self</span></div>
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<div class="viewcode-block" id="Return.is_read_only"><a class="viewcode-back" href="../../api/Lib.Terminator.html#Lib.Terminator.Return.is_read_only">[docs]</a> <span class="k">def</span> <span class="nf">is_read_only</span><span class="p">(</span><span class="bp">self</span><span class="p">)</span> <span class="o">-></span> <span class="nb">bool</span><span class="p">:</span>
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<span class="k">return</span> <span class="kc">True</span></div></div>
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<div class="viewcode-block" id="BranchingTerminator"><a class="viewcode-back" href="../../api/Lib.Terminator.html#Lib.Terminator.BranchingTerminator">[docs]</a><span class="nd">@dataclass</span><span class="p">(</span><span class="n">init</span><span class="o">=</span><span class="kc">False</span><span class="p">)</span>
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<span class="k">class</span> <span class="nc">BranchingTerminator</span><span class="p">(</span><span class="n">Instruction</span><span class="p">):</span>
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<span class="w"> </span><span class="sd">"""A terminating statement with a condition."""</span>
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<span class="c1">#: The condition of the branch</span>
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<span class="n">cond</span><span class="p">:</span> <span class="n">Condition</span>
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<span class="c1">#: The destination label if the condition is true</span>
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<span class="n">label_then</span><span class="p">:</span> <span class="n">Label</span>
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<span class="c1">#: The destination label if the condition is false</span>
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<span class="n">label_else</span><span class="p">:</span> <span class="n">Label</span>
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<span class="c1">#: The first operand of the condition</span>
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<span class="n">op1</span><span class="p">:</span> <span class="n">Operand</span>
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<span class="c1">#: The second operand of the condition</span>
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<span class="n">op2</span><span class="p">:</span> <span class="n">Operand</span>
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<span class="n">_read_only</span> <span class="o">=</span> <span class="kc">True</span>
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<span class="k">def</span> <span class="fm">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">cond</span><span class="p">:</span> <span class="n">Condition</span><span class="p">,</span> <span class="n">op1</span><span class="p">:</span> <span class="n">Operand</span><span class="p">,</span> <span class="n">op2</span><span class="p">:</span> <span class="n">Operand</span><span class="p">,</span>
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<span class="n">label_then</span><span class="p">:</span> <span class="n">Label</span><span class="p">,</span> <span class="n">label_else</span><span class="p">:</span> <span class="n">Label</span><span class="p">):</span>
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<span class="bp">self</span><span class="o">.</span><span class="n">cond</span> <span class="o">=</span> <span class="n">cond</span>
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<span class="bp">self</span><span class="o">.</span><span class="n">label_then</span> <span class="o">=</span> <span class="n">label_then</span>
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<span class="bp">self</span><span class="o">.</span><span class="n">label_else</span> <span class="o">=</span> <span class="n">label_else</span>
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<span class="bp">self</span><span class="o">.</span><span class="n">op1</span> <span class="o">=</span> <span class="n">op1</span>
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<span class="bp">self</span><span class="o">.</span><span class="n">op2</span> <span class="o">=</span> <span class="n">op2</span>
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<span class="bp">self</span><span class="o">.</span><span class="n">ins</span> <span class="o">=</span> <span class="nb">str</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">cond</span><span class="p">)</span>
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<div class="viewcode-block" id="BranchingTerminator.args"><a class="viewcode-back" href="../../api/Lib.Terminator.html#Lib.Terminator.BranchingTerminator.args">[docs]</a> <span class="k">def</span> <span class="nf">args</span><span class="p">(</span><span class="bp">self</span><span class="p">)</span> <span class="o">-></span> <span class="n">List</span><span class="p">[</span><span class="n">Operand</span><span class="p">]:</span>
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<span class="k">return</span> <span class="p">[</span><span class="bp">self</span><span class="o">.</span><span class="n">op1</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">op2</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">label_then</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">label_else</span><span class="p">]</span></div>
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<div class="viewcode-block" id="BranchingTerminator.targets"><a class="viewcode-back" href="../../api/Lib.Terminator.html#Lib.Terminator.BranchingTerminator.targets">[docs]</a> <span class="k">def</span> <span class="nf">targets</span><span class="p">(</span><span class="bp">self</span><span class="p">)</span> <span class="o">-></span> <span class="n">List</span><span class="p">[</span><span class="n">Label</span><span class="p">]:</span>
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<span class="w"> </span><span class="sd">"""Return the labels targetted by the Branching terminator."""</span>
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<span class="k">return</span> <span class="p">[</span><span class="bp">self</span><span class="o">.</span><span class="n">label_then</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">label_else</span><span class="p">]</span></div>
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<div class="viewcode-block" id="BranchingTerminator.rename"><a class="viewcode-back" href="../../api/Lib.Terminator.html#Lib.Terminator.BranchingTerminator.rename">[docs]</a> <span class="k">def</span> <span class="nf">rename</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">renamer</span><span class="p">:</span> <span class="n">Renamer</span><span class="p">):</span>
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<span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">op1</span><span class="p">,</span> <span class="n">Temporary</span><span class="p">):</span>
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<span class="bp">self</span><span class="o">.</span><span class="n">op1</span> <span class="o">=</span> <span class="n">renamer</span><span class="o">.</span><span class="n">replace</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">op1</span><span class="p">)</span>
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<span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">op2</span><span class="p">,</span> <span class="n">Temporary</span><span class="p">):</span>
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<span class="bp">self</span><span class="o">.</span><span class="n">op2</span> <span class="o">=</span> <span class="n">renamer</span><span class="o">.</span><span class="n">replace</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">op2</span><span class="p">)</span></div>
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<div class="viewcode-block" id="BranchingTerminator.substitute"><a class="viewcode-back" href="../../api/Lib.Terminator.html#Lib.Terminator.BranchingTerminator.substitute">[docs]</a> <span class="k">def</span> <span class="nf">substitute</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">subst</span><span class="p">:</span> <span class="n">Dict</span><span class="p">[</span><span class="n">Operand</span><span class="p">,</span> <span class="n">Operand</span><span class="p">]):</span>
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<span class="k">for</span> <span class="n">op</span> <span class="ow">in</span> <span class="n">subst</span><span class="p">:</span>
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<span class="k">if</span> <span class="n">op</span> <span class="ow">not</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="n">args</span><span class="p">():</span>
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<span class="k">raise</span> <span class="ne">Exception</span><span class="p">(</span>
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<span class="s2">"substitute: Operand </span><span class="si">{}</span><span class="s2"> is not present in instruction </span><span class="si">{}</span><span class="s2">"</span>
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<span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="n">op</span><span class="p">,</span> <span class="bp">self</span><span class="p">))</span>
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<span class="n">op1</span> <span class="o">=</span> <span class="n">subst</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">op1</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">op1</span><span class="p">)</span> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">op1</span><span class="p">,</span> <span class="n">Temporary</span><span class="p">)</span> \
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<span class="k">else</span> <span class="bp">self</span><span class="o">.</span><span class="n">op1</span>
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<span class="n">op2</span> <span class="o">=</span> <span class="n">subst</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">op2</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">op2</span><span class="p">)</span> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">op2</span><span class="p">,</span> <span class="n">Temporary</span><span class="p">)</span> \
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<span class="k">else</span> <span class="bp">self</span><span class="o">.</span><span class="n">op2</span>
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<span class="k">return</span> <span class="n">BranchingTerminator</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">cond</span><span class="p">,</span> <span class="n">op1</span><span class="p">,</span> <span class="n">op2</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">label_then</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">label_else</span><span class="p">)</span></div>
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<div class="viewcode-block" id="BranchingTerminator.with_args"><a class="viewcode-back" href="../../api/Lib.Terminator.html#Lib.Terminator.BranchingTerminator.with_args">[docs]</a> <span class="k">def</span> <span class="nf">with_args</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">new_args</span><span class="p">:</span> <span class="n">List</span><span class="p">[</span><span class="n">Operand</span><span class="p">]):</span>
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<span class="k">if</span> <span class="nb">len</span><span class="p">(</span><span class="n">new_args</span><span class="p">)</span> <span class="o">!=</span> <span class="mi">4</span><span class="p">:</span>
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<span class="k">raise</span> <span class="ne">Exception</span><span class="p">(</span>
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<span class="s2">"substitute: Invalid number of arguments for instruction </span><span class="si">{}</span><span class="s2">, expected 4 got </span><span class="si">{}</span><span class="s2">"</span>
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<span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">new_args</span><span class="p">))</span>
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<span class="n">op1</span> <span class="o">=</span> <span class="n">new_args</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span>
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<span class="n">op2</span> <span class="o">=</span> <span class="n">new_args</span><span class="p">[</span><span class="mi">1</span><span class="p">]</span>
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<span class="k">return</span> <span class="n">BranchingTerminator</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">cond</span><span class="p">,</span> <span class="n">op1</span><span class="p">,</span> <span class="n">op2</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">label_then</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">label_else</span><span class="p">)</span></div>
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<span class="k">def</span> <span class="fm">__hash__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
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<span class="k">return</span> <span class="nb">hash</span><span class="p">(</span><span class="nb">super</span><span class="p">)</span></div>
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<span class="n">Terminator</span> <span class="o">=</span> <span class="n">Return</span> <span class="o">|</span> <span class="n">AbsoluteJump</span> <span class="o">|</span> <span class="n">BranchingTerminator</span>
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<span class="sd">"""Type alias for terminators"""</span>
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|
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<div class="viewcode-block" id="jump2terminator"><a class="viewcode-back" href="../../api/Lib.Terminator.html#Lib.Terminator.jump2terminator">[docs]</a><span class="k">def</span> <span class="nf">jump2terminator</span><span class="p">(</span><span class="n">j</span><span class="p">:</span> <span class="n">ConditionalJump</span> <span class="o">|</span> <span class="n">AbsoluteJump</span> <span class="o">|</span> <span class="kc">None</span><span class="p">,</span>
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<span class="n">next_label</span><span class="p">:</span> <span class="n">Label</span> <span class="o">|</span> <span class="kc">None</span><span class="p">)</span> <span class="o">-></span> <span class="n">Terminator</span><span class="p">:</span>
|
|
<span class="w"> </span><span class="sd">"""</span>
|
|
<span class="sd"> Construct the Terminator associated to the potential jump j</span>
|
|
<span class="sd"> to the potential label next_label.</span>
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|
<span class="sd"> """</span>
|
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<span class="k">match</span> <span class="n">j</span><span class="p">:</span>
|
|
<span class="k">case</span> <span class="n">ConditionalJump</span><span class="p">():</span>
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|
<span class="k">if</span> <span class="p">(</span><span class="n">next_label</span> <span class="ow">is</span> <span class="kc">None</span><span class="p">):</span>
|
|
<span class="k">raise</span> <span class="n">MiniCInternalError</span><span class="p">(</span>
|
|
<span class="s2">"jump2terminator: Missing secondary label for instruction </span><span class="si">{}</span><span class="s2">"</span>
|
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<span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="n">j</span><span class="p">))</span>
|
|
<span class="n">label_else</span> <span class="o">=</span> <span class="n">next_label</span>
|
|
<span class="k">return</span> <span class="n">BranchingTerminator</span><span class="p">(</span><span class="n">j</span><span class="o">.</span><span class="n">cond</span><span class="p">,</span> <span class="n">j</span><span class="o">.</span><span class="n">op1</span><span class="p">,</span> <span class="n">j</span><span class="o">.</span><span class="n">op2</span><span class="p">,</span> <span class="n">j</span><span class="o">.</span><span class="n">label</span><span class="p">,</span> <span class="n">label_else</span><span class="p">)</span>
|
|
<span class="k">case</span> <span class="n">AbsoluteJump</span><span class="p">():</span>
|
|
<span class="k">return</span> <span class="n">AbsoluteJump</span><span class="p">(</span><span class="n">label</span><span class="o">=</span><span class="n">j</span><span class="o">.</span><span class="n">label</span><span class="p">)</span>
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<span class="k">case</span><span class="w"> </span><span class="k">_</span><span class="p">:</span>
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|
<span class="k">if</span> <span class="n">next_label</span><span class="p">:</span>
|
|
<span class="k">return</span> <span class="n">AbsoluteJump</span><span class="p">(</span><span class="n">next_label</span><span class="p">)</span>
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<span class="k">else</span><span class="p">:</span>
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<span class="k">return</span> <span class="n">Return</span><span class="p">()</span></div>
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</pre></div>
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