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JSSpecCompiler: Add control flow graph simplification pass

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It removes empty `BasicBlock`s with an unconditional jump continuation
and then removes unreferenced blocks from the graph.
This commit is contained in:
Dan Klishch 2023-08-19 16:20:04 -04:00 • committed by Andrew Kaster
parent 475ef6965a
commit 12072dbac5
7 changed files with 215 additions and 1 deletions
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10
Meta/Lagom/Tools/CodeGenerators/JSSpecCompiler/AST/AST.cpp
View file

@ -31,6 +31,16 @@ void NodeSubtreePointer::replace_subtree(Badge<RecursiveASTVisitor>, NullableTre
});
}
Vector<BasicBlockRef*> ControlFlowJump::references()
{
return { &m_block };
}
Vector<BasicBlockRef*> ControlFlowBranch::references()
{
return { &m_then, &m_else };
}
Vector<NodeSubtreePointer> BinaryOperation::subtrees()
{
return { { &m_left }, { &m_right } };

12
Meta/Lagom/Tools/CodeGenerators/JSSpecCompiler/AST/AST.h
View file

@ -80,7 +80,11 @@ protected:
// ```.
class Statement : public Node { };
class Expression : public Node { };
class ControlFlowOperator : public Statement { };
class ControlFlowOperator : public Statement {
public:
virtual Vector<BasicBlockRef*> references() = 0;
};
class ErrorNode : public Expression {
public:
@ -106,6 +110,8 @@ public:
VariableRef m_return_value;
Vector<BasicBlockRef*> references() override { return {}; }
protected:
void dump_tree(StringBuilder& builder) override;
};
@ -117,6 +123,8 @@ public:
{
}
Vector<BasicBlockRef*> references() override;
BasicBlockRef m_block;
protected:
@ -135,6 +143,8 @@ public:
{
}
Vector<BasicBlockRef*> references() override;
Tree m_condition;
BasicBlockRef m_then;
BasicBlockRef m_else;