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JSSpecCompiler: Add control flow graph simplification pass
It removes empty `BasicBlock`s with an unconditional jump continuation and then removes unreferenced blocks from the graph.
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475ef6965a
commit
12072dbac5
7 changed files with 215 additions and 1 deletions
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@ -31,6 +31,16 @@ void NodeSubtreePointer::replace_subtree(Badge<RecursiveASTVisitor>, NullableTre
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});
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}
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Vector<BasicBlockRef*> ControlFlowJump::references()
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{
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return { &m_block };
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}
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Vector<BasicBlockRef*> ControlFlowBranch::references()
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{
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return { &m_then, &m_else };
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}
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Vector<NodeSubtreePointer> BinaryOperation::subtrees()
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{
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return { { &m_left }, { &m_right } };
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@ -80,7 +80,11 @@ protected:
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// ```.
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class Statement : public Node { };
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class Expression : public Node { };
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class ControlFlowOperator : public Statement { };
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class ControlFlowOperator : public Statement {
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public:
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virtual Vector<BasicBlockRef*> references() = 0;
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};
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class ErrorNode : public Expression {
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public:
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@ -106,6 +110,8 @@ public:
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VariableRef m_return_value;
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Vector<BasicBlockRef*> references() override { return {}; }
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protected:
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void dump_tree(StringBuilder& builder) override;
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};
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@ -117,6 +123,8 @@ public:
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{
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}
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Vector<BasicBlockRef*> references() override;
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BasicBlockRef m_block;
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protected:
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@ -135,6 +143,8 @@ public:
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{
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}
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Vector<BasicBlockRef*> references() override;
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Tree m_condition;
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BasicBlockRef m_then;
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BasicBlockRef m_else;
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