Register booleans as internal types.

13/ast.cpp

@@ -204,10 +204,10 @@ type_ptr ast_case::typecheck(type_mgr& mgr, type_env_ptr& env) {
 
     input_type = mgr.resolve(case_type, var);
     type_app* app_type;
-    if(!(app_type = dynamic_cast<type_app*>(input_type.get())) ||
+    // if(!(app_type = dynamic_cast<type_app*>(input_type.get())) ||
-            !dynamic_cast<type_data*>(app_type->constructor.get())) {
+    //         !dynamic_cast<type_data*>(app_type->constructor.get())) {
-        throw type_error("attempting case analysis of non-data type", of->loc);
+    //     throw type_error("attempting case analysis of non-data type", of->loc);
-    }
+    // }
 
     return branch_type;
 }
@@ -250,6 +250,11 @@ struct case_mappings {
         assert(default_case);
         return *default_case;
     }
+    
+    std::vector<instruction_ptr>& get_case_for(tag_type tag) {
+        if(case_defined_for(tag)) return get_specific_case_for(tag);
+        return get_default_case();
+    }
 
     bool case_defined_for(tag_type tag) {
         return defined_cases.find(tag) != defined_cases.end();
@@ -288,8 +293,19 @@ struct case_strategy_bool {
         return 2;
     }
 
-    instruction_ptr into_instruction(const type* type, case_mappings<case_strategy_bool>& ms) {
+    void into_instructions(
-        throw std::runtime_error("boolean case unimplemented!");
+            const type* type,
+            case_mappings<case_strategy_bool>& ms,
+            std::vector<instruction_ptr>& into) {
+        if(ms.defined_cases_count() == 0) {
+            for(auto& instruction : ms.get_default_case())
+                into.push_back(std::move(instruction));
+            return;
+        }
+
+        into.push_back(instruction_ptr(new instruction_if(
+                        std::move(ms.get_case_for(true)),
+                        std::move(ms.get_case_for(false)))));
     }
 };
 
@@ -327,7 +343,10 @@ struct case_strategy_data {
         return static_cast<const type_data*>(type)->constructors.size();
     }
 
-    instruction_ptr into_instruction(const type* type, case_mappings<case_strategy_data>& ms) {
+    void into_instructions(
+            const type* type,
+            case_mappings<case_strategy_data>& ms,
+            std::vector<instruction_ptr>& into) {
         instruction_jump* jump_instruction = new instruction_jump();
         instruction_ptr inst(jump_instruction);
 
@@ -350,7 +369,7 @@ struct case_strategy_data {
             }
         }
 
-        return std::move(inst);
+        into.push_back(std::move(inst));
     }
 };
 
@@ -364,6 +383,7 @@ void compile_case(const ast_case& node, const env_ptr& env, const type* type, st
             auto& branch_into = cases.make_default_case();
             env_ptr new_env(new env_var(branch->expr->env->get_mangled_name(vpat->var), env));
             branch->expr->compile(new_env, branch_into);
+            branch_into.push_back(instruction_ptr(new instruction_slide(1)));
         } else {
             auto repr = strategy.from_typed_pattern(branch->pat, type);
             auto& branch_into = cases.make_case_for(strategy.tag_from_repr(repr));
@@ -375,7 +395,7 @@ void compile_case(const ast_case& node, const env_ptr& env, const type* type, st
                 cases.default_case_defined()))
         throw type_error("incomplete patterns", node.loc);
 
-    into.push_back(strategy.into_instruction(type, cases));
+    strategy.into_instructions(type, cases, into);
 }
 
 void ast_case::compile(const env_ptr& env, std::vector<instruction_ptr>& into) const {

13/instruction.cpp

@@ -122,6 +122,45 @@ void instruction_jump::gen_llvm(llvm_context& ctx, Function* f) const {
     ctx.builder.SetInsertPoint(safety_block);
 }
 
+void instruction_if::print(int indent, std::ostream& to) const {
+    print_indent(indent, to);
+    to << "If(" << std::endl;
+    for(auto& instruction : on_true) {
+        instruction->print(indent + 2, to);
+    }
+    to << std::endl;
+    for(auto& instruction : on_false) {
+        instruction->print(indent + 2, to);
+    }
+    print_indent(indent, to);
+    to << ")" << std::endl;
+}
+
+void instruction_if::gen_llvm(llvm_context& ctx, llvm::Function* f) const {
+    auto top_node = ctx.create_peek(f, ctx.create_size(0));
+    auto num = ctx.unwrap_num(top_node);
+
+    auto nonzero_block = BasicBlock::Create(ctx.ctx, "nonzero", f);
+    auto zero_block = BasicBlock::Create(ctx.ctx, "zero", f);
+    auto resume_block = BasicBlock::Create(ctx.ctx, "resume", f);
+    auto switch_op = ctx.builder.CreateSwitch(num, nonzero_block, 2);
+
+    switch_op->addCase(ctx.create_i32(0), zero_block);
+    ctx.builder.SetInsertPoint(nonzero_block);
+    for(auto& instruction : on_true) {
+        instruction->gen_llvm(ctx, f);
+    }
+    ctx.builder.CreateBr(resume_block);
+
+    ctx.builder.SetInsertPoint(zero_block);
+    for(auto& instruction : on_true) {
+        instruction->gen_llvm(ctx, f);
+    }
+    ctx.builder.CreateBr(resume_block);
+
+    ctx.builder.SetInsertPoint(resume_block);
+}
+
 void instruction_slide::print(int indent, std::ostream& to) const {
     print_indent(indent, to);
     to << "Slide(" << offset << ")" << std::endl;

13/instruction.hpp

@@ -101,6 +101,19 @@ struct instruction_jump : public instruction {
     void gen_llvm(llvm_context& ctx, llvm::Function* f) const;
 };
 
+struct instruction_if : public instruction {
+    std::vector<instruction_ptr> on_true;
+    std::vector<instruction_ptr> on_false;
+
+    instruction_if(
+            std::vector<instruction_ptr> t,
+            std::vector<instruction_ptr> f)
+        : on_true(std::move(t)), on_false(std::move(f)) {}
+
+    void print(int indent, std::ostream& to) const;
+    void gen_llvm(llvm_context& ctx, llvm::Function* f) const;
+};
+
 struct instruction_slide : public instruction {
     int offset;
 

13/main.cpp

@@ -22,13 +22,15 @@ void yy::parser::error(const yy::location& loc, const std::string& msg) {
     std::cout << "An error occured: " << msg << std::endl;
 }
 
-void typecheck_program(
+void prelude_types(definition_group& defs, type_env_ptr env) {
-        definition_group& defs,
-        type_mgr& mgr, type_env_ptr& env) {
     type_ptr int_type = type_ptr(new type_internal("Int")); 
     env->bind_type("Int", int_type);
     type_ptr int_type_app = type_ptr(new type_app(int_type));
 
+    type_ptr bool_type = type_ptr(new type_internal("Bool"));
+    env->bind_type("Bool", bool_type);
+    type_ptr bool_type_app = type_ptr(new type_app(bool_type));
+
     type_ptr binop_type = type_ptr(new type_arr(
                 int_type_app,
                 type_ptr(new type_arr(int_type_app, int_type_app))));
@@ -37,6 +39,15 @@ void typecheck_program(
     env->bind("*", binop_type, visibility::global);
     env->bind("/", binop_type, visibility::global);
 
+    env->bind("True", bool_type_app, visibility::global);
+    env->bind("False", bool_type_app, visibility::global);
+}
+
+void typecheck_program(
+        definition_group& defs,
+        type_mgr& mgr, type_env_ptr& env) {
+    prelude_types(defs, env);
+
     std::set<std::string> free;
     defs.find_free(free);
     defs.typecheck(mgr, env);
@@ -60,23 +71,6 @@ global_scope translate_program(definition_group& group) {
     return scope;
 }
 
-void gen_llvm_internal_op(llvm_context& ctx, binop op) {
-    auto new_function = ctx.create_custom_function(op_action(op), 2);
-    std::vector<instruction_ptr> instructions;
-    instructions.push_back(instruction_ptr(new instruction_push(1)));
-    instructions.push_back(instruction_ptr(new instruction_eval()));
-    instructions.push_back(instruction_ptr(new instruction_push(1)));
-    instructions.push_back(instruction_ptr(new instruction_eval()));
-    instructions.push_back(instruction_ptr(new instruction_binop(op)));
-    instructions.push_back(instruction_ptr(new instruction_update(2)));
-    instructions.push_back(instruction_ptr(new instruction_pop(2)));
-    ctx.builder.SetInsertPoint(&new_function->getEntryBlock());
-    for(auto& instruction : instructions) {
-        instruction->gen_llvm(ctx, new_function);
-    }
-    ctx.builder.CreateRetVoid();
-}
-
 void output_llvm(llvm_context& ctx, const std::string& filename) {
     std::string targetTriple = llvm::sys::getDefaultTargetTriple();
 
@@ -117,12 +111,43 @@ void output_llvm(llvm_context& ctx, const std::string& filename) {
     }
 }
 
+void gen_llvm_internal_op(llvm_context& ctx, binop op) {
+    auto new_function = ctx.create_custom_function(op_action(op), 2);
+    std::vector<instruction_ptr> instructions;
+    instructions.push_back(instruction_ptr(new instruction_push(1)));
+    instructions.push_back(instruction_ptr(new instruction_eval()));
+    instructions.push_back(instruction_ptr(new instruction_push(1)));
+    instructions.push_back(instruction_ptr(new instruction_eval()));
+    instructions.push_back(instruction_ptr(new instruction_binop(op)));
+    instructions.push_back(instruction_ptr(new instruction_update(2)));
+    instructions.push_back(instruction_ptr(new instruction_pop(2)));
+    ctx.builder.SetInsertPoint(&new_function->getEntryBlock());
+    for(auto& instruction : instructions) {
+        instruction->gen_llvm(ctx, new_function);
+    }
+    ctx.builder.CreateRetVoid();
+}
+
+void gen_llvm_boolean_constructor(llvm_context& ctx, const std::string& s, bool b) {
+    auto new_function = ctx.create_custom_function(s, 0);
+    std::vector<instruction_ptr> instructions;
+    instructions.push_back(instruction_ptr(new instruction_pushint(b)));
+    instructions.push_back(instruction_ptr(new instruction_update(0)));
+    ctx.builder.SetInsertPoint(&new_function->getEntryBlock());
+    for(auto& instruction : instructions) {
+        instruction->gen_llvm(ctx, new_function);
+    }
+    ctx.builder.CreateRetVoid();
+}
+
 void gen_llvm(global_scope& scope) {
     llvm_context ctx;
     gen_llvm_internal_op(ctx, PLUS);
     gen_llvm_internal_op(ctx, MINUS);
     gen_llvm_internal_op(ctx, TIMES);
     gen_llvm_internal_op(ctx, DIVIDE);
+    gen_llvm_boolean_constructor(ctx, "True", true);
+    gen_llvm_boolean_constructor(ctx, "False", false);
 
     scope.generate_llvm(ctx);