BlockAnalysisPass.cpp

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#include "BlockAnalysisPass.hpp"
#include "../../frontend/Tokenizer.hpp"
#include "../framework/AnalysisManager.hpp"
#include "BuildCFGPass.hpp"
 
#include <algorithm>
 
namespace analysis {
 
BlockAnalysisPass::Result
BlockAnalysisPass::run(const std::vector<Token>& tokens, AnalysisManager& am) {
    const auto& cfg_result = am.getResult<BuildCFGPass>();
 
    Result result;
    result.cfg_blocks = cfg_result.cfg_blocks;
 
    for (auto& block : result.cfg_blocks) {
        int current_stack = 0;
        int min_stack_in_block = 0;
 
        for (int j = block.start_token_idx; j < block.end_token_idx; ++j) {
            const auto& token = tokens[j];
            const auto behavior = get_token_behavior(token);
 
            int items_needed = behavior.arity;
            if (current_stack < items_needed) {
                min_stack_in_block =
                    std::max(min_stack_in_block, items_needed - current_stack);
            }
 
            current_stack += behavior.stack_effect;
        }
 
        block.stack_effect = current_stack;
        block.min_stack_needed = min_stack_in_block;
    }
 
    return result;
}
 
} // namespace analysis