Add support for basic blocks and CFGs #49
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Added class for representing basic blocks, and a helper function to generate basic blocks from AST. For testing, disabled the loop_finder code.
Add support to build a dominator tree for a given CFG, and add APIs to use the dominator tree to find idoms and dominance information.
This commit does the following things: 1) Cleans up the basic_block def by adding a typedef. 2) Adds code to generate a idom map, which makes it easy to iterate over the dominator tree. 3) Implements a skeleton class for loop analysis pass. 4) Adds relevant tests to builder_context.cpp to test the dominator_tree APIs 5) Rename the dominator_tree class to dominator_analysis class.
This commit adds the analysis pass to find natural loops and subloops. It uses the algorithm from LLVM LoopInfo anaylsis pass for the same, heavily uses the dominance tree to find the backedges and loop headers.
…ic block was carved out.
…sis (36/43 tests pass)
…oop simplifications
…tter with lesser LOC)
…headers that are not immediate parent
…rough more than 2 loops
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Added class for representing basic blocks, and a helper function to generate basic blocks from AST. For testing, disabled the loop_finder code.
Update v1: Added code to iterate the CFGs and build a dominator tree.
Update v2: Generate idom_map and add loop info pass skeleton
Update v3: Implement the loop info pass and add the run to the builder_context.cpp