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114 lines
3.7 KiB
114 lines
3.7 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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#ifdef DEBUG // 用于调试信息,大家可以在编译过程中通过" -DDEBUG"来开启这一选项
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#define DEBUG_OUTPUT std::cout << __LINE__ << std::endl; // 输出行号的简单示例
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#else
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#define DEBUG_OUTPUT
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#endif
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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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auto module = Module::create("SysYF code"); // module name是什么无关紧要
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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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// add(a, b)
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// 函数参数类型的vector
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std::vector<SysYF::Ptr<Type>> Ints(2, Int32Type);
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//通过返回值类型与参数类型列表得到函数类型
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auto addFunTy = FunctionType::create(Int32Type, Ints);
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// 由函数类型得到函数
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auto addFun = Function::create(addFunTy,
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"add", module);
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// BB的名字在生成中无所谓,但是可以方便阅读
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auto bb = BasicBlock::create(module, "entry", addFun);
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builder->set_insert_point(bb); // 一个BB的开始,将当前插入指令点的位置设在bb
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auto retAlloca = builder->create_alloca(Int32Type); // 在内存中分配返回值的位置
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auto aAlloca = builder->create_alloca(Int32Type); // 在内存中分配参数a的位置
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auto bAlloca = builder->create_alloca(Int32Type); // 在内存中分配参数b的位置
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std::vector<SysYF::Ptr<Value>> args; // 获取add函数的形参,通过Function中的iterator
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for (auto arg = addFun->arg_begin(); arg != addFun->arg_end(); arg++) {
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args.push_back(*arg); // * 号运算符是从迭代器中取出迭代器当前指向的元素
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}
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builder->create_store(args[0], aAlloca); // store参数a
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builder->create_store(args[1], bAlloca); // store参数b
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auto aLoad = builder->create_load(aAlloca); // load参数a
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auto bLoad = builder->create_load(bAlloca); // load参数b
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// a+b
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auto add = builder->create_iadd(aLoad, bLoad);
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// a+b-1
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auto sub = builder->create_isub(add, CONST_INT(1));
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builder->create_store(sub, retAlloca);
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auto retLoad = builder->create_load(retAlloca);
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builder->create_ret(retLoad);
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builder->create_ret(retLoad);
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// main函数
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auto mainFun = Function::create(FunctionType::create(Int32Type, {}),
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"main", module);
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bb = BasicBlock::create(module, "entry", mainFun);
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// BasicBlock的名字在生成中无所谓,但是可以方便阅读
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builder->set_insert_point(bb);
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retAlloca = builder->create_alloca(Int32Type);
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// int a;
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auto a = builder->create_alloca(Int32Type);
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// int b;
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auto b = builder->create_alloca(Int32Type);
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// int c;
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auto c = builder->create_alloca(Int32Type);
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// a = 3;
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builder->create_store(CONST_INT(3), a);
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// b = 2;
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builder->create_store(CONST_INT(2), b);
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// c = 5;
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builder->create_store(CONST_INT(5), c);
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// tmp = add(a, b);
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aLoad = builder->create_load(a);
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bLoad = builder->create_load(b);
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auto tmp = builder->create_call(addFun, {aLoad, bLoad});
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// ret = c + tmp;
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auto cLoad = builder->create_load(c);
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auto ret = builder->create_iadd(cLoad, tmp);
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builder->create_store(ret, retAlloca);
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retLoad = builder->create_load(retAlloca);
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builder->create_ret(retLoad);
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std::cout << module->print();
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return 0;
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}
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