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AssemFunc.cpp
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AssemFunc.cpp
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#include "AssemFunc.hpp"
#include <iostream>
#include <boost/lexical_cast.hpp>
#include <algorithm>
AssemFunc::AssemFunc(string name) {
_name = name;
_stackPointer = 0;
_pointerByReg = "";
initFreeRegs();
}
void AssemFunc::initFreeRegs() {
string regs[] = {"r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", "r8", "r9",
"r10"};
_freeRegs = vector<string>(regs, regs + sizeof(regs) / sizeof(string));
}
void AssemFunc::addFront(string name, vector<string> args) {
_comms.push_front(AssemCom(name, args));
}
void AssemFunc::addBack(string name, vector<string> args) {
_comms.push_back(AssemCom(name, args));
}
void AssemFunc::addListBack(list<AssemCom> l) {
_comms.splice(_comms.end(), l);
}
void AssemFunc::addListFront(list<AssemCom> l) {
_comms.splice(_comms.begin(), l);
}
// Increase the running count of the stack depth. This is called from ASTVisitor
// whenever something is put onto the stack
void AssemFunc::increaseStackPointer(int i) {
_stackPointer += i;
}
// The stack pointer might be moved an amount that is unknown at compile time,
// we allow for that here
void AssemFunc::increaseStackPointerByReg(string reg) {
_pointerByReg = reg;
}
int AssemFunc::getStackPointer() {
return _stackPointer;
}
string AssemFunc::getName() {
return _name;
}
void AssemFunc::finalise() {
// Add the necessary commands to the top and bottom of the function,
// depending on if the function is the main entry point, and whether the
// local stack pointer needs to be moved or not
// NB: Front intrsuctions are done in reverse
if (_name == "main") {
vector<string> args;
args.push_back("r0");
args.push_back("#0");
addBack("mov", args);
}
if (_stackPointer > 0) {
// Only do this if we actually need to move the pointer, avoid
// sub sp sp #0 and the like.
vector<string> spArgs(2, "sp");
spArgs.push_back("#" + boost::lexical_cast<string>(_stackPointer));
addFront("sub", spArgs);
vector<string> fpArgs;
fpArgs.push_back("fp");
fpArgs.push_back("sp");
fpArgs.push_back("#4");
addFront("add", fpArgs);
fpArgs.clear();
fpArgs.push_back("sp");
fpArgs.push_back("fp");
fpArgs.push_back("#4");
addBack("sub", fpArgs);
} else if (_pointerByReg != "") {
if (_pointerByReg[0] == '.') {
// size is in a label
string tempReg = _freeRegs.front();
vector<string> spArgs(2, "sp");
spArgs.push_back(tempReg);
addFront("sub", spArgs);
spArgs.clear();
spArgs.push_back(tempReg);
spArgs.push_back(_pointerByReg);
addFront("ldr", spArgs);
} else {
vector<string> spArgs(2, "sp");
spArgs.push_back(_pointerByReg);
addFront("sub", spArgs);
}
vector<string> fpArgs;
fpArgs.push_back("fp");
fpArgs.push_back("sp");
fpArgs.push_back("#4");
addFront("add", fpArgs);
fpArgs.clear();
fpArgs.push_back("sp");
fpArgs.push_back("fp");
fpArgs.push_back("#4");
addBack("sub", fpArgs);
}
if (_name == "main") {
vector<string> args;
args.push_back("sp!");
args.push_back("{fp, lr}");
addFront("stmfd", args);
args.clear();
args.push_back("sp!");
args.push_back("{fp, pc}");
addBack("ldmfd", args);
addFront("main:", vector<string>());
vector<string> globArgs(1, _name);
addFront(".global", globArgs);
} else {
vector<string> args;
args.push_back("sp!");
args.push_back("{r4-r10, fp, lr}");
addFront("stmfd", args);
args.clear();
args.push_back("sp!");
args.push_back("{r4-r10, fp, pc}");
addBack("ldmfd", args);
addFront(_name + ":", vector<string>());
}
vector<string> alignArgs(1, "2");
addFront(".align", alignArgs);
}
list<AssemCom>& AssemFunc::getComms() {
return _comms;
}
void AssemFunc::setFreeRegs(vector<string> v) {
_freeRegs = v;
}
void AssemFunc::removeReg(string reg) {
_freeRegs.erase(
std::remove(_freeRegs.begin(), _freeRegs.end(), reg), _freeRegs.end());
}
vector<string> AssemFunc::getFreeRegs() {
return _freeRegs;
}
bool AssemFunc::regIsFree(string reg) {
return find(_freeRegs.begin(), _freeRegs.end(), reg) != _freeRegs.end();
}
void AssemFunc::freeReg(string reg) {
_freeRegs.push_back(reg);
}