[deploy]移除了Backend.h和.cpp

This commit is contained in:
LixuanWang
2025-07-16 10:37:19 +08:00
parent bb1602aa5f
commit bd7f6ea6f6
2 changed files with 0 additions and 512 deletions

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#include "Backend.h"
using namespace sysy;
namespace sysy {
using RegId = RegManager::RegId;
string CodeGen::code_gen() {
string code;
code += module_gen(module);
return code;
}
string CodeGen::module_gen(Module *module) {
string code;
string dataCode;
string textCode;
// clear last module's label record
clearModuleRecord(module);
// generate asmcode for all global values
dataCode += globaldata_gen();
code += space + ".arch armv7ve " + eol;
code += space + ".text " + eol;
auto functions = module->getFunctions();
for (auto iter = functions->begin(); iter != functions->end(); ++iter) {
string name = iter->first;
Function *func = iter->second;
auto bblist = func->getBasicBlocks();
if (bblist.empty())
continue;
// generate asmcode for each function
textCode += function_gen(func) + eol;
}
code += (dataCode + textCode + eol);
return code;
}
string CodeGen::functionHead_gen(Function *func) {
string code;
code += space + ".globl " + func->getName() + eol;
code += space + ".p2align " + std::to_string(int_p2align) + eol;
code += space + ".type " + func->getName() + ", %function" + eol;
code += func->getName() + ":" + eol;
return code;
}
/**
* stack structure:
*
* last function stack
* -------------------------- <-- fp point
* callee-saved regs (include fp, sp, lr)
* --------------------------
* local variables and subfunc's return value (ir inst)
* --------------------------
* arg0,arg1,arg2,arg3 (as tempory variable)
* --------------------------
* caller-saved regs
* --------------------------
* arg_x ~ arg_4
* -------------------------- <-- sp point
* next function stack
*
*/
/**
* prologue :
* preserve callee-saved registers (lr, fp and other callee-saved regs)
* set new fp
* alloc stack space for local var/ args / return value.
* store args to stack
* */
string CodeGen::prologueCode_gen(Function *func) {
string code;
/**
*code in here
*/
return code;
}
/* epilogue :
* free stack space
* restore sp
* restore used callee-saved register(lr, fp and other callee-saved
* regs) bx lr
*/
string CodeGen::epilogueCode_gen(Function *func) {
string code;
/**
*code in here
*/
return code;
}
string CodeGen::function_gen(Function *func) {
curFunc = func;
clearFunctionRecord(func);
string bbCode;
auto bbs = func->getBasicBlocks();
for (auto iter = bbs.begin(); iter != bbs.end(); ++iter) {
auto bb = iter->get();
bbCode += basicBlock_gen(bb);
}
string code;
string funcHead = functionHead_gen(func);
string prologueCode = prologueCode_gen(func);
string epilogueCode = epilogueCode_gen(func);
string literalPoolsCode = literalPoolsCode_gen(func);
//
code = funcHead + prologueCode + bbCode + epilogueCode + literalPoolsCode;
return code;
}
string CodeGen::basicBlock_gen(BasicBlock *bb) {
curBB = bb;
string bbLabel = getBBLabel(bb);
string code;
code += bbLabel + ":" + eol;
for (auto &instr : bb->getInstructions()) {
auto instrType = instr->getKind();
code += instruction_gen(instr.get());
}
return code;
}
/**
* RegId : binaryInst_gen returns RegId as its destination operand
* code : asmcode generated by binaryInst_gen
*/
pair<RegId, string> CodeGen::binaryInst_gen(BinaryInst *bInst, RegId dstRegId) {
string code;
/**
*code in here
*/
return {dstRegId, code};
}
pair<RegId, string> CodeGen::unaryInst_gen(UnaryInst *uInst, RegId dstRegId) {
string code;
/**
*code in here
*/
return {dstRegId, code};
}
pair<RegId, string> CodeGen::allocaInst_gen(AllocaInst *aInst,
RegManager::RegId dstRegId) {
string code;
/**
*code in here
*/
return {dstRegId, code};
}
string CodeGen::storeInst_gen(StoreInst *stInst) {
string code;
/**
*code in here
*/
return code;
}
pair<RegId, string> CodeGen::loadInst_gen(LoadInst *ldInst, RegId dstRegId) {
string code;
/**
*code in here
*/
return {dstRegId, code};
}
string CodeGen::returnInst_gen(ReturnInst *retInst) {
string code;
/**
*code in here
*/
return code;
}
string CodeGen::uncondBrInst_gen(UncondBrInst *ubInst) {
string code;
/**
*code in here
*/
return code;
}
string CodeGen::condBrInst_gen(CondBrInst *cbInst) {
string code;
/**
*code in here
*/
return code;
}
pair<RegId, string> CodeGen::callInst_gen(CallInst *callInst, RegId dstRegId) {
string code;
/**
*code in here
*/
return {dstRegId, code};
}
string CodeGen::instruction_gen(Instruction *instr) {
string code;
string unkName = instr->getName();
RegManager::RegId dstRegId = RegManager::RNONE;
auto instrType = instr->getKind();
pair<RegId, string> tmp;
switch (instrType) {
// binary inst
case Instruction::kAdd:
case Instruction::kMul:
case Instruction::kSub: {
BinaryInst *bInst = dynamic_cast<BinaryInst *>(instr);
// registers are used only for instruction operation, consider use which
// register (any one that is free for use)
tmp = binaryInst_gen(bInst, RegManager::RANY);
code += tmp.second;
dstRegId = tmp.first;
break;
}
case Instruction::kLoad: {
LoadInst *ldInst = dynamic_cast<LoadInst *>(instr);
tmp = loadInst_gen(ldInst, RegManager::RANY);
code += M_emitComment("load inst");
code += tmp.second;
dstRegId = tmp.first;
break;
}
case Instruction::kStore: {
StoreInst *stInst = dynamic_cast<StoreInst *>(instr);
code += M_emitComment("store inst");
code += storeInst_gen(stInst);
return code;
break;
}
case Instruction::kAlloca: {
AllocaInst *aInst = dynamic_cast<AllocaInst *>(instr);
tmp = allocaInst_gen(aInst, RegManager::RANY);
code += M_emitComment("alloca inst");
code += tmp.second;
dstRegId = tmp.first;
break;
}
case Instruction::kReturn: {
ReturnInst *retInst = dynamic_cast<ReturnInst *>(instr);
code += M_emitComment("return inst");
code += returnInst_gen(retInst);
return code;
break;
}
case Instruction::kCall: {
CallInst *cInst = dynamic_cast<CallInst *>(instr);
auto tmp = callInst_gen(cInst, RegManager::RANY);
code += tmp.second;
dstRegId = tmp.first;
if (dstRegId == RegManager::R0)
return code;
break;
}
case Instruction::kBr: {
UncondBrInst *ubInst = dynamic_cast<UncondBrInst *>(instr);
code += uncondBrInst_gen(ubInst);
return code;
break;
}
case Instruction::kCondBr: {
CondBrInst *cbInst = dynamic_cast<CondBrInst *>(instr);
code += condBrInst_gen(cbInst);
return code;
break;
}
default: {
code +=
"ERROR CODE : instruction " + unkName + " is not implementation" + eol;
break;
}
}
if (!instr->getType()->isVoid()) {
code += storeRegToStack_gen(dstRegId, instr);
// regm.freeReg(dstRegId);//TODO : code in here.
}
return code;
}
//
string CodeGen::globaldata_gen() {
string asmCode;
/**
*code in here
*/
return asmCode;
}
string CodeGen::literalPoolsCode_gen(Function *func) {
string code;
/**
*code in here
*/
return code;
}
} // namespace sysy

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#pragma once
/**
* 后端设计需要注意的点
*
* label分配 :
* 全局变量的label,常量的label,basicblock的label,函数入口label,函数出口label
* 全局数据处理
* 常量处理
* 临时变量的处理(包括函数参数也是临时变量)
* 函数参数的处理
* 块参数的处理 (如果SSA问题通过块传参解决则需要处理块参数)
* 函数栈空间结构的设计
* 块的遍历问题
* arm32的过程调用约定
*
* 后端测试需要注意的点
*
* 如何汇编与链接.
* qemu以及树莓派如何运行.
*/
#include <algorithm>
#include <set>
#include <string>
#include <vector>
#include "IR.h"
using std::find;
using std::map;
using std::pair;
using std::set;
using std::string;
using std::to_string;
using std::vector;
#define Macro_ERROR_MSG(...) \
do { \
fprintf(stderr, "ERROR in line-%d of %s: ", __LINE__, __FILE__); \
fprintf(stderr, __VA_ARGS__); \
fprintf(stderr, "\n"); \
fflush(stderr); \
exit(1); \
} while (0);
#define M_emitInst(STR) (space + STR + eol)
#define M_emitComment(STR) (space + "//" + STR + eol)
#define M_emitLabel(STR) (STR + ":" + eol)
// #define REG_EXP
static const string space = string(4, ' ');
static const string eol = "\n";
// only for armv7
static const int int_align = 4;
static const int int_size = 4;
static const int int_p2align = 2;
static const int reg_size = 4;
// default arm32 max imm
//
static const uint32_t maxMovImm = 0xFFF;
static const string stackIndexReg = "fp";
static uint16_t getWordHigh(uint32_t cval) { return (cval >> 16) & 0xFFFF; }
static uint16_t getWordLow(uint32_t cval) { return cval & 0xFFFF; }
//
static string emitInst_1srcR_noDstR(string name, string srcReg) {
return space + name + " " + srcReg + eol;
}
static string emitInst_2srcR_1dstR(string name, string srcReg0, string srcReg1,
string dstReg) {
return space + name + " " + dstReg + ", " + srcReg0 + ", " + srcReg1 + eol;
}
namespace sysy {
//
class RegManager {
public:
//{0,1,2,3,4,5,6,7,8,9,10};
enum RegId : unsigned {
R0 = 0,
R1 = 1,
R2 = 2,
R3 = 3,
R4 = 4,
R5 = 5,
R6 = 6,
R7 = 7,
R8 = 8,
R9 = 9,
R10 = 10,
RNONE = 1024,
RANY = 2048,
};
static string toString(RegId reg) {
if (reg == RNONE)
return "RNONE";
if (reg == RANY)
return "RANY";
return "r" + to_string(reg);
}
};
class Operand {
public:
using RegId = RegManager::RegId;
enum Kind {
kReg,
kImm,
};
Kind kind;
union {
uint32_t imm;
RegId regId;
};
Operand(){};
Operand(uint32_t imm) : kind(kImm), imm(imm) {}
Operand(RegId regId) : kind(kReg), regId(regId) {}
bool isImm(void) { return kind == kImm; }
bool isReg(void) { return kind == kReg; }
uint32_t getImm(void) {
assert(kind == kImm);
return imm;
}
RegId getRegId(void) {
assert(kind == kReg);
return regId;
}
string toString(void) {
if (kind == kImm)
return "#" + to_string(imm);
else
return RegManager::toString(regId);
}
};
class CodeGen {
public:
using RegId = RegManager::RegId;
private:
sysy::Module *module;
Function *curFunc;
BasicBlock *curBB;
//
RegManager regm;
// globalValue
bool loadGlobalValByMOVWT = true;
// basicBlock
vector<BasicBlock *> linear_bb;
int bb_no = 0;
// function params, return value and localVar
map<Argument *, int> paramsStOffset;
map<Instruction *, int> localVarStOffset;
int retValueStOffset = 0;
size_t stOffsetAcc = 0;
// label manager
map<BasicBlock *, string> bb_labels;
uint64_t label_no = 0;
public:
CodeGen(Module *module) : module(module) {}
// code_gen function list
string code_gen();
string module_gen(Module *module);
string function_gen(Function *func);
string basicBlock_gen(BasicBlock *bb);
string instruction_gen(Instruction *instr);
string globaldata_gen();
string prologueCode_gen(Function *func);
string epilogueCode_gen(Function *func);
string literalPoolsCode_gen(Function *func);
string functionHead_gen(Function *func);
// Module
void clearModuleRecord(Module *module) { label_no = 0; }
// instruction gen function list
//<dstReg, code>
pair<RegId, string> loadInst_gen(LoadInst *ldInst, RegId dstRegId);
string storeInst_gen(StoreInst *stInst);
pair<RegId, string> allocaInst_gen(AllocaInst *aInst, RegId dstRegId);
string returnInst_gen(ReturnInst *retInst);
pair<RegId, string> callInst_gen(CallInst *retInst, RegId dstRegId);
pair<RegId, string> binaryInst_gen(BinaryInst *bInst, RegId dstRegId);
pair<RegId, string> unaryInst_gen(UnaryInst *bInst, RegId dstRegId);
string uncondBrInst_gen(UncondBrInst *ubInst);
string condBrInst_gen(CondBrInst *ubInst);
//
string storeRegToStack_gen(RegId regId, Instruction *inst) {
string code;
/**
*code in here
*/
return code;
}
// function
void clearFunctionRecord(Function *func) {
localVarStOffset.clear();
paramsStOffset.clear();
retValueStOffset = 0;
bb_labels.clear();
//
stOffsetAcc = 0;
}
string getBBLabel(BasicBlock *bb) {
auto t = bb_labels.find(bb);
string label;
if (t == bb_labels.end()) {
label = ".LBB_" + to_string(label_no++);
bb_labels.emplace(bb, label);
} else {
label = t->second;
}
return label;
}
};
} // namespace sysy