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79 lines
2.7 KiB
79 lines
2.7 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 while");
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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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auto zero_initializer = ConstantZero::create(Int32Type, module);
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auto b = GlobalVariable::create("b", module, Int32Type, false, zero_initializer);//int b=0;
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auto a = GlobalVariable::create("a", module, Int32Type, false, CONST_INT(3));//int a=3;
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//main函数
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auto mainFunTy = FunctionType::create(Int32Type, {});//main函数没有参数
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auto mainFun = Function::create(mainFunTy, "main", module);//创建main函数
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auto bb = BasicBlock::create(module, "entry",mainFun);//创建一个名为entry的基本块
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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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// while(a>0){
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// b = b+a;
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// a = a-1;
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// }
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// return b;
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builder->create_store(CONST_INT(0), b);//b=0
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builder->create_store(CONST_INT(3), a);//a=3
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auto condBB = BasicBlock::create(module, "condBB", mainFun);
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auto whileBB = BasicBlock::create(module, "trueBB_while", mainFun);
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auto falseBB = BasicBlock::create(module, "falseBB_while", mainFun);
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//无条件br
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builder->create_br(condBB);//goto condBB
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//condBB
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builder->set_insert_point(condBB);
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auto aLoad = builder->create_load(a);//a
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auto icmp = builder->create_icmp_gt(aLoad, CONST_INT(0));//a>0
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//条件br
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builder->create_cond_br(icmp, whileBB, falseBB);//if(a>0) goto whileBB; else goto falseBB;
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//whileBB
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builder->set_insert_point(whileBB);
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auto bLoad = builder->create_load(b);//b
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//b = b+a
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auto bAdda = builder->create_iadd(bLoad, aLoad);//b+a
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builder->create_store(bAdda, b);//b=b+a
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//a = a-1
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auto aSub1 = builder->create_isub(aLoad, CONST_INT(1));//a-1
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builder->create_store(aSub1, a);//a=a-1
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//无条件br
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builder->create_br(condBB);//goto condBB
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//falseBB
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builder->set_insert_point(falseBB);
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auto bLoadr = builder->create_load(b);//b
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builder->create_ret(bLoadr);//return b
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std::cout << module->print();
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return 0;
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}
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