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63 lines
2.3 KiB
63 lines
2.3 KiB
#include "BasicBlock.h"
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#include "Constant.h"
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#include "Function.h"
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#include "IRStmtBuilder.h"
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#include "Module.h"
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#include "Type.h"
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#include <iostream>
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#include <memory>
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#define CONST_INT(num) \
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ConstantInt::create(num, module)
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#define CONST_FP(num) \
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ConstantFloat::create(num, module) // 得到常数值的表示,方便后面多次用到
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using namespace SysYF::IR;
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int main()
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{
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// 创建module和builder
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auto module = Module::create("SysYF code");
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auto builder = IRStmtBuilder::create(nullptr, module);
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SysYF::Ptr<Type> Int32Type = Type::get_int32_type(module);
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SysYF::Ptr<Type> FloatType = Type::get_float_type(module);
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// 全局变量
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auto zero_initializer = ConstantZero::create(Int32Type, module);
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auto a = GlobalVariable::create("a", module, Int32Type, false, zero_initializer);
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auto b = GlobalVariable::create("b", module, Int32Type, false, zero_initializer);
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// main 函数
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auto mainFunTy = Function::create(FunctionType::create(Int32Type, {}), "main", module);
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auto bb = BasicBlock::create(module, "entry", mainFunTy);
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builder->set_insert_point(bb);
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// 赋初值
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builder->create_store(CONST_INT(3), a); // a = 3
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builder->create_store(CONST_INT(0), b); // b = 0
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// 建立while循环
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auto condBB = BasicBlock::create(module, "condBB_while", mainFunTy);
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auto trueBB = BasicBlock::create(module, "trueBB_while", mainFunTy);
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auto falseBB = BasicBlock::create(module, "falseBB_while", mainFunTy);
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builder->create_br(condBB);
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builder->set_insert_point(condBB);
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// while循环条件
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auto a_Load = builder->create_load(a); // load a
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auto icmp = builder->create_icmp_gt(a_Load, CONST_INT(0));
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builder->create_cond_br(icmp, trueBB, falseBB);
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// while循环体
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builder->set_insert_point(trueBB);
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a_Load = builder->create_load(a); // load a
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auto b_Load = builder->create_load(b); // load b
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auto add = builder->create_iadd(b_Load, a_Load);
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auto sub = builder->create_isub(a_Load, CONST_INT(1));
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builder->create_store(add, b); // b = b + a
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builder->create_store(sub, a); // a = a - 1
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builder->create_br(condBB); // 跳转到循环条件
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// while循环结束
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builder->set_insert_point(falseBB);
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// return
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auto ret_Load = builder->create_load(b);
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builder->create_ret(ret_Load);
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// 输出IR
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std::cout << module->print();
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} |