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<li class="toctree-l1"><a class="reference internal" href="../../api/Lib.Errors.html">Base library - Errors</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../../api/Lib.Statement.html">Base library - Statement</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../../api/Lib.RiscV.html">Base library - RISC-V instructions</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../../api/Lib.Operands.html">Base library - Operands</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../../api/Lib.FunctionData.html">Base library - Function data</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../../api/Lib.LinearCode.html">Linear intermediate representation</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../../api/Lib.Allocator.html">Temporary allocation</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../../api/Lib.CFG.html">Control Flow Graph - CFG and Basic blocks</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../../api/Lib.Terminator.html">Control Flow Graph - Terminators</a></li>
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<h1>Source code for Lib.Allocator</h1><div class="highlight"><pre>
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<span></span><span class="sd">"""</span>
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<span class="sd">This file defines the base class :py:class:`Allocator`</span>
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<span class="sd">and the naïve implementation :py:class:`NaiveAllocator`.</span>
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<span class="sd">"""</span>
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<span class="kn">from</span> <span class="nn">Lib.Operands</span> <span class="kn">import</span> <span class="n">Temporary</span><span class="p">,</span> <span class="n">Operand</span><span class="p">,</span> <span class="n">DataLocation</span><span class="p">,</span> <span class="n">GP_REGS</span>
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<span class="kn">from</span> <span class="nn">Lib.Statement</span> <span class="kn">import</span> <span class="n">Instruction</span>
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<span class="kn">from</span> <span class="nn">Lib.Errors</span> <span class="kn">import</span> <span class="n">AllocationError</span>
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<span class="kn">from</span> <span class="nn">Lib.FunctionData</span> <span class="kn">import</span> <span class="n">FunctionData</span>
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<span class="kn">from</span> <span class="nn">typing</span> <span class="kn">import</span> <span class="n">Dict</span><span class="p">,</span> <span class="n">List</span>
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<div class="viewcode-block" id="Allocator"><a class="viewcode-back" href="../../api/Lib.Allocator.html#Lib.Allocator.Allocator">[docs]</a><span class="k">class</span> <span class="nc">Allocator</span><span class="p">():</span>
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<span class="sd">"""General base class for Naive, AllInMem and Smart Allocators.</span>
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<span class="sd"> Replace all temporaries in the code with actual data locations.</span>
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<span class="sd"> Allocation is done in two steps:</span>
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<span class="sd"> - First, :py:meth:`prepare` is responsible for calling</span>
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<span class="sd"> :py:meth:`Lib.Operands.TemporaryPool.set_temp_allocation`</span>
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<span class="sd"> with a mapping from temporaries to where they should actually be stored</span>
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<span class="sd"> (in registers or in memory).</span>
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<span class="sd"> - Then, :py:meth:`replace` is called for each instruction in order to</span>
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<span class="sd"> replace the temporary operands with the previously assigned locations</span>
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<span class="sd"> (and possibly add some instructions before or after).</span>
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<span class="sd"> Concretely, it returns a list of instructions that should replace the original</span>
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<span class="sd"> instruction. The actual iteration over all the instructions is handled transparently</span>
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<span class="sd"> by :py:meth:`Lib.LinearCode.LinearCode.iter_statements`.</span>
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<span class="sd"> """</span>
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<span class="n">_fdata</span><span class="p">:</span> <span class="n">FunctionData</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">fdata</span><span class="p">:</span> <span class="n">FunctionData</span><span class="p">):</span>
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<span class="bp">self</span><span class="o">.</span><span class="n">_fdata</span> <span class="o">=</span> <span class="n">fdata</span>
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<div class="viewcode-block" id="Allocator.prepare"><a class="viewcode-back" href="../../api/Lib.Allocator.html#Lib.Allocator.Allocator.prepare">[docs]</a> <span class="k">def</span> <span class="nf">prepare</span><span class="p">(</span><span class="bp">self</span><span class="p">)</span> <span class="o">-></span> <span class="kc">None</span><span class="p">:</span> <span class="c1"># pragma: no cover</span>
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<span class="k">pass</span></div>
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<div class="viewcode-block" id="Allocator.replace"><a class="viewcode-back" href="../../api/Lib.Allocator.html#Lib.Allocator.Allocator.replace">[docs]</a> <span class="k">def</span> <span class="nf">replace</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">old_instr</span><span class="p">:</span> <span class="n">Instruction</span><span class="p">)</span> <span class="o">-></span> <span class="n">List</span><span class="p">[</span><span class="n">Instruction</span><span class="p">]:</span>
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<span class="sd">"""Transform an instruction with temporaries into a list of instructions."""</span>
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<span class="k">return</span> <span class="p">[</span><span class="n">old_instr</span><span class="p">]</span></div>
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<div class="viewcode-block" id="Allocator.rewriteCode"><a class="viewcode-back" href="../../api/Lib.Allocator.html#Lib.Allocator.Allocator.rewriteCode">[docs]</a> <span class="k">def</span> <span class="nf">rewriteCode</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">listcode</span><span class="p">)</span> <span class="o">-></span> <span class="kc">None</span><span class="p">:</span>
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<span class="sd">"""Modify the code to replace temporaries with</span>
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<span class="sd"> registers or memory locations.</span>
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<span class="sd"> """</span>
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<span class="n">listcode</span><span class="o">.</span><span class="n">iter_statements</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">replace</span><span class="p">)</span></div></div>
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<div class="viewcode-block" id="NaiveAllocator"><a class="viewcode-back" href="../../api/Lib.Allocator.html#Lib.Allocator.NaiveAllocator">[docs]</a><span class="k">class</span> <span class="nc">NaiveAllocator</span><span class="p">(</span><span class="n">Allocator</span><span class="p">):</span>
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<span class="sd">"""Naive Allocator: try to assign a register to each temporary,</span>
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<span class="sd"> fails if there are more temporaries than registers.</span>
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<span class="sd"> """</span>
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<div class="viewcode-block" id="NaiveAllocator.replace"><a class="viewcode-back" href="../../api/Lib.Allocator.html#Lib.Allocator.NaiveAllocator.replace">[docs]</a> <span class="k">def</span> <span class="nf">replace</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">old_instr</span><span class="p">:</span> <span class="n">Instruction</span><span class="p">)</span> <span class="o">-></span> <span class="n">List</span><span class="p">[</span><span class="n">Instruction</span><span class="p">]:</span>
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<span class="sd">"""Replace Temporary operands with the corresponding allocated Register."""</span>
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<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> <span class="o">=</span> <span class="p">[]</span>
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<span class="k">for</span> <span class="n">arg</span> <span class="ow">in</span> <span class="n">old_instr</span><span class="o">.</span><span class="n">args</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="n">arg</span><span class="p">,</span> <span class="n">Temporary</span><span class="p">):</span>
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<span class="n">new_args</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">arg</span><span class="o">.</span><span class="n">get_alloced_loc</span><span class="p">())</span>
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<span class="k">else</span><span class="p">:</span>
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<span class="n">new_args</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">arg</span><span class="p">)</span>
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<span class="n">new_instr</span> <span class="o">=</span> <span class="n">old_instr</span><span class="o">.</span><span class="n">with_args</span><span class="p">(</span><span class="n">new_args</span><span class="p">)</span>
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<span class="k">return</span> <span class="p">[</span><span class="n">new_instr</span><span class="p">]</span></div>
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<div class="viewcode-block" id="NaiveAllocator.prepare"><a class="viewcode-back" href="../../api/Lib.Allocator.html#Lib.Allocator.NaiveAllocator.prepare">[docs]</a> <span class="k">def</span> <span class="nf">prepare</span><span class="p">(</span><span class="bp">self</span><span class="p">)</span> <span class="o">-></span> <span class="kc">None</span><span class="p">:</span>
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<span class="sd">"""Allocate all temporaries to registers.</span>
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<span class="sd"> Fail if there are too many temporaries."""</span>
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<span class="n">regs</span> <span class="o">=</span> <span class="nb">list</span><span class="p">(</span><span class="n">GP_REGS</span><span class="p">)</span> <span class="c1"># Get a writable copy</span>
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<span class="n">temp_allocation</span><span class="p">:</span> <span class="n">Dict</span><span class="p">[</span><span class="n">Temporary</span><span class="p">,</span> <span class="n">DataLocation</span><span class="p">]</span> <span class="o">=</span> <span class="nb">dict</span><span class="p">()</span>
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<span class="k">for</span> <span class="n">tmp</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="n">_fdata</span><span class="o">.</span><span class="n">_pool</span><span class="o">.</span><span class="n">get_all_temps</span><span class="p">():</span>
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<span class="k">try</span><span class="p">:</span>
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<span class="n">reg</span> <span class="o">=</span> <span class="n">regs</span><span class="o">.</span><span class="n">pop</span><span class="p">()</span>
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<span class="k">except</span> <span class="ne">IndexError</span><span class="p">:</span>
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<span class="k">raise</span> <span class="n">AllocationError</span><span class="p">(</span>
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<span class="s2">"Too many temporaries (</span><span class="si">{}</span><span class="s2">) for the naive allocation, sorry."</span>
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<span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="nb">len</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">_fdata</span><span class="o">.</span><span class="n">_pool</span><span class="o">.</span><span class="n">get_all_temps</span><span class="p">())))</span>
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<span class="n">temp_allocation</span><span class="p">[</span><span class="n">tmp</span><span class="p">]</span> <span class="o">=</span> <span class="n">reg</span>
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<span class="bp">self</span><span class="o">.</span><span class="n">_fdata</span><span class="o">.</span><span class="n">_pool</span><span class="o">.</span><span class="n">set_temp_allocation</span><span class="p">(</span><span class="n">temp_allocation</span><span class="p">)</span></div></div>
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