You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
730 lines
31 KiB
730 lines
31 KiB
package chocopy.pa3;
|
|
|
|
import java.net.Socket;
|
|
import java.util.HashMap;
|
|
import java.util.List;
|
|
import java.util.Map;
|
|
|
|
import chocopy.common.analysis.AbstractNodeAnalyzer;
|
|
import chocopy.common.analysis.SymbolTable;
|
|
import chocopy.common.astnodes.*;
|
|
import chocopy.common.analysis.types.*;
|
|
import chocopy.common.codegen.*;
|
|
|
|
import static chocopy.common.codegen.RiscVBackend.Register.*;
|
|
import chocopy.common.codegen.RiscVBackend.Register;
|
|
|
|
|
|
/**
|
|
* This is where the main implementation of PA3 will live.
|
|
*
|
|
* <p>
|
|
* A large part of the functionality has already been implemented in the base
|
|
* class, CodeGenBase. Make sure to read through that class, since you will want
|
|
* to use many of its fields and utility methods in this class when emitting
|
|
* code.
|
|
*
|
|
* <p>
|
|
* Also read the PDF spec for details on what the base class does and what APIs
|
|
* it exposes for its sub-class (this one). Of particular importance is knowing
|
|
* what all the SymbolInfo classes contain.
|
|
*/
|
|
public class CodeGenImpl extends CodeGenBase
|
|
{
|
|
/** Label for built-in routines. */
|
|
protected final Label makeintLabel = new Label("makeint");
|
|
protected final Label strneqlLablel = new Label("strneql");
|
|
protected final Label streqlLablel = new Label("streql");
|
|
protected final Label makeboolLablel = new Label("makebool");
|
|
protected final Label strcatLablel = new Label("strcat");
|
|
protected final Label concatLablel = new Label("concat");
|
|
protected final Label conslistLablel = new Label("conslist");
|
|
|
|
|
|
|
|
|
|
/** Operation on None. */
|
|
private final Label errorNone = new Label("error.None");
|
|
/** Division by zero. */
|
|
private final Label errorDiv = new Label("error.Div");
|
|
/** Index out of bounds. */
|
|
private final Label errorOob = new Label("error.OOB");
|
|
|
|
/** Let's try to implement everything first.*/
|
|
private final Label errorNI = new Label("error.NI");
|
|
|
|
/** A code generator emitting instructions to BACKEND. */
|
|
public CodeGenImpl(RiscVBackend backend)
|
|
{
|
|
super(backend);
|
|
|
|
}
|
|
|
|
|
|
/**
|
|
* Emits the top level of the program.
|
|
*
|
|
* <p>
|
|
* This method is invoked exactly once, and is surrounded by some boilerplate
|
|
* code that: (1) initializes the heap before the top-level begins and (2) exits
|
|
* after the top-level ends.
|
|
*
|
|
* <p>
|
|
* You only need to generate code for statements.
|
|
*
|
|
* @param statements top level statements
|
|
*/
|
|
protected void emitTopLevel(List<Stmt> statements)
|
|
{
|
|
StmtAnalyzer stmtAnalyzer = new StmtAnalyzer(null);
|
|
backend.emitADDI(SP, SP, -2 * backend.getWordSize(), "Saved FP and saved RA (unused at top level).");
|
|
backend.emitSW(ZERO, SP, 0, "Top saved FP is 0.");
|
|
backend.emitSW(ZERO, SP, 4, "Top saved RA is 0.");
|
|
backend.emitADDI(FP, SP, 2 * backend.getWordSize(), "Set FP to previous SP.");
|
|
|
|
for (Stmt stmt : statements)
|
|
{
|
|
stmt.dispatch(stmtAnalyzer);
|
|
}
|
|
backend.emitLI(A0, EXIT_ECALL, "Code for ecall: exit");
|
|
backend.emitEcall(null);
|
|
}
|
|
|
|
/**
|
|
* Emits the code for a function described by FUNCINFO.
|
|
*
|
|
* <p>
|
|
* This method is invoked once per function and method definition. At the code
|
|
* generation stage, nested functions are emitted as separate functions of their
|
|
* own. So if function `bar` is nested within function `foo`, you only emit
|
|
* `foo`'s code for `foo` and only emit `bar`'s code for `bar`.
|
|
*/
|
|
protected void emitUserDefinedFunction(FuncInfo funcInfo)
|
|
{
|
|
backend.emitGlobalLabel(funcInfo.getCodeLabel());
|
|
|
|
|
|
|
|
// --- Prologue ---
|
|
// space for return address = 1
|
|
// space for control link = 1
|
|
// space for static link = 1
|
|
// space for params = num of params
|
|
// space for locals = num of locals
|
|
int requiredStackSpace = (1 + 1 + 1 + funcInfo.getLocals().size() + funcInfo.getParams().size())*wordSize;
|
|
|
|
backend.emitADDI(SP, SP, -requiredStackSpace, "Reserve space for stack frame.");
|
|
backend.emitSW(RA, SP, requiredStackSpace-4, "return address");
|
|
backend.emitSW(FP, SP, requiredStackSpace-8, "control link");
|
|
// if we want to add static link
|
|
//backend.emitSW(FP, SP, requiredStackSpace-12, "static link");
|
|
backend.emitADDI(FP, SP, requiredStackSpace, "New fp is at old SP.");
|
|
|
|
|
|
StmtAnalyzer stmtAnalyzer = new StmtAnalyzer(funcInfo);
|
|
int emptySlotNum = 4;
|
|
for (StackVarInfo var : funcInfo.getLocals()) {
|
|
// store at requiredStackSpace-emptySlotNum*wordSize(SP), then emptySlotNum++
|
|
Literal varLitral = var.getInitialValue();
|
|
varLitral.dispatch(stmtAnalyzer);
|
|
// All Literals should save locations for the values in A0
|
|
backend.emitSW(A0, SP, requiredStackSpace-emptySlotNum*wordSize, "Push local variable " + var.getVarName() + " onto stack");
|
|
emptySlotNum++;
|
|
}
|
|
|
|
// --- Function Body ---
|
|
// statements load all the variables that caller put on stack
|
|
// statements use fp to load the variables
|
|
// example: 0(fp) is the last variable (z) while 8(fp) is the first variable (x)
|
|
// for function with 3 params f(x, y, z)
|
|
for (Stmt stmt : funcInfo.getStatements()) {
|
|
//System.out.println(stmt.toString());
|
|
stmt.dispatch(stmtAnalyzer);
|
|
}
|
|
backend.emitJ(stmtAnalyzer.epilogue, "Jump to function epilogue");
|
|
|
|
|
|
|
|
// --- Epilogue ---
|
|
backend.emitLocalLabel(stmtAnalyzer.epilogue, "Epilogue");
|
|
backend.emitLW(RA, FP, -4, "Get return address");
|
|
backend.emitLW(FP, FP, -8, "Use control link to restore caller's fp");
|
|
backend.emitADDI(SP, SP, requiredStackSpace, "Restore stack pointer");
|
|
backend.emitJR(RA, "Return to caller");
|
|
}
|
|
|
|
/** An analyzer that encapsulates code generation for statements. */
|
|
private class StmtAnalyzer extends AbstractNodeAnalyzer<Register> {
|
|
/*
|
|
* The symbol table has all the info you need to determine what a given
|
|
* identifier 'x' in the current scope is. You can use it as follows: SymbolInfo
|
|
* x = sym.get("x");
|
|
*
|
|
* A SymbolInfo can be one the following: - ClassInfo: a descriptor for classes
|
|
* - FuncInfo: a descriptor for functions/methods - AttrInfo: a descriptor for
|
|
* attributes - GlobalVarInfo: a descriptor for global variables - StackVarInfo:
|
|
* a descriptor for variables allocated on the stack, such as locals and
|
|
* parameters
|
|
*
|
|
* Since the input program is assumed to be semantically valid and well-typed at
|
|
* this stage, you can always assume that the symbol table contains valid
|
|
* information. For example, in an expression `foo()` you KNOW that
|
|
* sym.get("foo") will either be a FuncInfo or ClassInfo, but not any of the
|
|
* other infos and never null.
|
|
*
|
|
* The symbol table in funcInfo has already been populated in the base class:
|
|
* CodeGenBase. You do not need to add anything to the symbol table. Simply
|
|
* query it with an identifier name to get a descriptor for a function, class,
|
|
* variable, etc.
|
|
*
|
|
* The symbol table also maps nonlocal and global vars, so you only need to
|
|
* lookup one symbol table and it will fetch the appropriate info for the var
|
|
* that is currently in scope.
|
|
*/
|
|
|
|
/** Symbol table for my statements. */
|
|
private final SymbolTable<SymbolInfo> sym;
|
|
|
|
/** Label of code that exits from procedure. */
|
|
protected final Label epilogue;
|
|
|
|
/** The descriptor for the current function, or null at the top level. */
|
|
private final FuncInfo funcInfo;
|
|
|
|
/** Label of code that exits from block. */
|
|
protected Label elseBlock;
|
|
|
|
/** Variable to keep track of offsets of stored variables */
|
|
private Map<SymbolInfo, Integer> offsetMap = new HashMap<>();
|
|
private final String size_label;
|
|
/** Variable to store offset from frame pointer to identify next
|
|
* empty space on stack frame to store variable*/
|
|
private int sp_off;
|
|
/** Variable to store maximum possible offset depending on stack size.*/
|
|
private int max_sp;
|
|
|
|
/**
|
|
* An analyzer for the function described by FUNCINFO0, which is null for the
|
|
* top level.
|
|
*/
|
|
StmtAnalyzer(FuncInfo funcInfo0) {
|
|
funcInfo = funcInfo0;
|
|
if (funcInfo == null) {
|
|
sym = globalSymbols;
|
|
sp_off = max_sp = 2;
|
|
size_label = "@..main.size";
|
|
} else {
|
|
sym = funcInfo.getSymbolTable();
|
|
sp_off = max_sp = funcInfo0.getLocals().size() + 2;
|
|
size_label = "@"+funcInfo0.getFuncName()+".size";
|
|
}
|
|
epilogue = generateLocalLabel();
|
|
}
|
|
private void incSp(int i){
|
|
sp_off+=i+1;
|
|
max_sp = max_sp >= sp_off?max_sp:sp_off;
|
|
}
|
|
|
|
|
|
|
|
|
|
// *********** functions start ***********
|
|
|
|
public Register analyze(CallExpr node) {
|
|
backend.emitLW(T6, FP, 0, "Inside CallExpr: " + node.function.name);
|
|
SymbolInfo Ty = globalSymbols.get(node.function.name);
|
|
if(Ty instanceof ClassInfo){
|
|
//object create
|
|
ClassInfo cls = (ClassInfo) Ty;
|
|
/**
|
|
la a0, $DoublingVector$prototype # Load pointer to prototype of: DoublingVector
|
|
jal alloc # Allocate new object in A0
|
|
sw a0, -12(fp) # Push on stack slot 3
|
|
sw a0, -16(fp) # Push argument 0 from last.
|
|
addi sp, fp, -16 # Set SP to last argument.
|
|
lw a1, 8(a0) # Load address of object's dispatch table
|
|
lw a1, 0(a1) # Load address of method: DoublingVector.__init__
|
|
jalr a1 # Invoke method: DoublingVector.__init__
|
|
addi sp, fp, -@..main.size # Set SP to stack frame top.
|
|
lw a0, -12(fp) # Pop stack slot 3
|
|
*/
|
|
backend.emitLA(A0, cls.getPrototypeLabel(),
|
|
String.format("Load pointer to prototype of: %s", cls.getClassName()));
|
|
backend.emitJAL(objectAllocLabel, "Allocate new object in A0");
|
|
backend.emitSW(A0, FP, -sp_off*wordSize, String.format("Push on stack slot %d", sp_off));
|
|
incSp(0);
|
|
|
|
backend.emitSW(A0, FP, -sp_off*wordSize, "Push argument 0 from last.");
|
|
backend.emitADDI(SP, FP, sp_off, "Set SP to last argument.");
|
|
backend.emitLW(A1, A0, getDispatchTableOffset(), "Load address of object's dispatch table");
|
|
backend.emitLW(A1, A1, getMethodOffset(cls, "__init__"), String.format("Load address of method: %s.__init__", cls.getClassName()));
|
|
backend.emitJALR(A1, String.format("Invoke method: %s.__init", cls.getClassName()));
|
|
backend.emitADDI(SP, FP, "-"+size_label, "Set SP to stack frame top.");
|
|
-- sp_off;
|
|
backend.emitLW(A0, FP, -sp_off*wordSize, String.format("Pop stack slot %d", sp_off));
|
|
} else {
|
|
// function
|
|
Identifier functionId = node.function;
|
|
|
|
List<Expr> args = node.args;
|
|
int spaceRequiredForArgs = (args.size() + 1)*4;
|
|
//backend.emitSW(A0, SP, -4, "Put static link");
|
|
for (int i = 0; i < args.size(); i++) {
|
|
int argNum = i + 1;
|
|
int slotNum = argNum + 1; // We have extra slot for static link
|
|
Expr expr = args.get(i);
|
|
expr.dispatch(this);
|
|
// All expressions should save their end result in A0
|
|
// So, once expr is evaluated add value inside A0 onto stack as an argument
|
|
backend.emitSW(A0, SP, -wordSize*slotNum, "Push argument " + argNum + " from left");
|
|
}
|
|
|
|
backend.emitADDI(SP, SP, -spaceRequiredForArgs, "Set SP to last argument.");
|
|
backend.emitJAL(new Label("$"+functionId.name), "Invoke function: " + functionId.name);
|
|
backend.emitADDI(SP, SP, spaceRequiredForArgs, "Set SP to stack frame top.");
|
|
}
|
|
return A0;
|
|
}
|
|
|
|
public Register analyze(MethodCallExpr node) {
|
|
backend.emitLW(T6, FP, 0, "Inside MethodCallExpr: " + node.method.member.name);
|
|
Register obj = node.method.object.dispatch(this);
|
|
int n_args = node.args.size();
|
|
|
|
Label label = generateLocalLabel();
|
|
backend.emitBNEZ(obj, label, "Ensure not None");
|
|
backend.emitJ(errorNone, "Go to error handler");
|
|
backend.emitLocalLabel(label, "Not None");
|
|
incSp(n_args+1);
|
|
backend.emitSW(obj, FP, (n_args - sp_off) *wordSize, String.format("Push argument %d from last.", n_args));
|
|
|
|
for (int i = 0; i < n_args; ++i)
|
|
backend.emitSW(node.args.get(i).dispatch(this), FP, (n_args - i - 1 - sp_off) * wordSize,
|
|
String.format("Push argument %d from last.", n_args - i - 1));
|
|
|
|
backend.emitLW(A0, FP, (n_args- sp_off) * wordSize, String.format("Peek stack slot %d", sp_off - (n_args + 1)));
|
|
ClassInfo objectClass = (ClassInfo)sym.get(((Identifier)node.method.object).name);
|
|
|
|
backend.emitLW(A1, A0, getDispatchTableOffset(), "Load address of object's dispatch table");
|
|
backend.emitLW(A1, A1, getMethodOffset(objectClass, node.method.member.name),
|
|
String.format("Load address of method: %s.%s", objectClass.getClassName(), node.method.member.name));
|
|
backend.emitADDI(SP, FP, -sp_off * wordSize, "Set SP to last argument.");
|
|
backend.emitJALR(A1, String.format("Invoke method: %s.%s", objectClass.getClassName(), node.method.member.name));
|
|
backend.emitInsn(String.format("addi sp, fp, -%s", size_label), "Set SP to stack frame top.");
|
|
sp_off -= n_args+1;
|
|
|
|
return A0;
|
|
}
|
|
|
|
|
|
@Override
|
|
public Register analyze(ReturnStmt stmt) {
|
|
backend.emitLW(T6, FP, 0, "Inside ReturnStmt: ");
|
|
Expr expr = stmt.value;
|
|
if (expr == null) {
|
|
backend.emitMV(A0, ZERO, "Return None");
|
|
return A0;
|
|
}
|
|
|
|
// All expressions should save their end result in A0
|
|
expr.dispatch(this);
|
|
|
|
return A0;
|
|
}
|
|
|
|
|
|
// *********** functions end ***********
|
|
|
|
|
|
@Override
|
|
public Register analyze(NoneLiteral node)
|
|
{
|
|
backend.emitLW(T6, FP, 0, "Inside NoneLiteral: ");
|
|
backend.emitMV(Register.A0, Register.ZERO, "Load none");
|
|
return Register.A0;
|
|
}
|
|
|
|
@Override
|
|
public Register analyze(StringLiteral node)
|
|
{
|
|
backend.emitLW(T6, FP, 0, "Inside StringLiteral: ");
|
|
Label l = constants.getStrConstant(node.value);
|
|
backend.emitLA(Register.A0, l, "Load string literal");
|
|
return Register.A0;
|
|
}
|
|
|
|
@Override
|
|
public Register analyze(BooleanLiteral node)
|
|
{
|
|
backend.emitLW(T6, FP, 0, "Inside BooleanLiteral: ");
|
|
if(node.value==true)
|
|
backend.emitLI(Register.A0, 1, "Load boolean literal: true ");
|
|
else
|
|
backend.emitLI(Register.A0, 0, "Load boolean literal: false ");
|
|
return Register.A0;
|
|
}
|
|
|
|
|
|
@Override
|
|
public Register analyze(AssignStmt node)
|
|
{
|
|
backend.emitLW(T6, FP, 0, "Inside AssignStmt: ");
|
|
Type t = node.value.getInferredType();
|
|
// if(t.isSpecialType() || t.isListType())
|
|
{
|
|
Register reg = node.value.dispatch(this);
|
|
if (reg == null)
|
|
reg = A0;
|
|
if (sym.getParent() == null)
|
|
{
|
|
for(Expr target: node.targets)
|
|
{
|
|
if(target instanceof Identifier)
|
|
{
|
|
GlobalVarInfo gvi=(GlobalVarInfo)sym.get(((Identifier)target).name);
|
|
backend.emitSW(reg, gvi.getLabel(), Register.T0, "Assign global: "+gvi.getVarName()+"(using tmp register)");
|
|
}
|
|
else
|
|
{
|
|
Register ret = target.dispatch(this);
|
|
backend.emitSW(T1, ret, 0, "Set list element");
|
|
}
|
|
}
|
|
}
|
|
else
|
|
{
|
|
for(Expr target: node.targets)
|
|
{
|
|
StackVarInfo svi = (StackVarInfo) sym.get(((Identifier)target).name);
|
|
int loc = offsetMap.get(svi);
|
|
backend.emitSW(reg, Register.FP, -loc*4, "Load local variable: "+svi.getVarName());
|
|
}
|
|
}
|
|
}
|
|
return Register.A0;
|
|
}
|
|
|
|
@Override
|
|
public Register analyze(ExprStmt node)
|
|
{
|
|
backend.emitLW(T6, FP, 0, "Inside ExprStmt: ");
|
|
node.expr.dispatch(this);
|
|
return null;
|
|
}
|
|
|
|
@Override
|
|
public Register analyze(IfExpr node)
|
|
{
|
|
node.condition.dispatch(this);
|
|
Label ln = generateLocalLabel();
|
|
node.thenExpr.dispatch(this);
|
|
backend.emitJ(ln, "Jump to end of if expression");
|
|
backend.emitLocalLabel(elseBlock, "Else part of if expression");
|
|
node.elseExpr.dispatch(this);
|
|
backend.emitLocalLabel(ln, "End of if expression");
|
|
return A0;
|
|
}
|
|
|
|
@Override
|
|
public Register analyze(IfStmt node)
|
|
{
|
|
node.condition.dispatch(this);
|
|
Label ln = generateLocalLabel();
|
|
for(Stmt s:node.thenBody)
|
|
s.dispatch(this);
|
|
backend.emitJ(ln, "Jump to end of if statement");
|
|
backend.emitLocalLabel(elseBlock, "Else part of if statement");
|
|
for(Stmt s:node.elseBody)
|
|
s.dispatch(this);
|
|
backend.emitLocalLabel(ln, "End of if statement");
|
|
return null;
|
|
}
|
|
|
|
@Override
|
|
public Register analyze(BinaryExpr node)
|
|
{
|
|
String operator = node.operator;
|
|
backend.emitLW(T6, FP, 0, "Inside BinaryExpr: ");
|
|
|
|
if(node.left.getInferredType().equals(Type.INT_TYPE) && node.right.getInferredType().equals(Type.INT_TYPE))
|
|
{
|
|
node.left.dispatch(this);
|
|
backend.emitSW(Register.A0, Register.FP, -sp_off*wordSize, "Push on stack slot "+sp_off);
|
|
sp_off++;
|
|
node.right.dispatch(this);
|
|
sp_off--;
|
|
backend.emitLW(Register.T0, Register.FP, -sp_off*wordSize, "Pop stack slot "+sp_off);
|
|
|
|
// Arithmetic Operators
|
|
if(operator.equals("+"))
|
|
backend.emitADD(Register.A0, Register.A0, Register.T0, "Add operation");
|
|
else if(operator.equals("-"))
|
|
backend.emitSUB(Register.A0, Register.A0, Register.T0, "Sub operation");
|
|
else if(operator.equals("*"))
|
|
backend.emitMUL(Register.A0, Register.A0, Register.T0, "Mul operation");
|
|
else if(operator.equals("//"))
|
|
{
|
|
Label label = generateLocalLabel();
|
|
backend.emitBNEZ(Register.T0, label, "Check for Divide-by-zero");
|
|
backend.emitJAL(errorDiv, "Divide-by-zero error");
|
|
backend.emitLocalLabel(label, "Divide since divisor not zero");
|
|
backend.emitDIV(Register.A0, Register.A0, Register.T0, "Divide operation");
|
|
}
|
|
else if(operator.equals("%"))
|
|
{
|
|
Label label = generateLocalLabel();
|
|
backend.emitBNEZ(Register.T0, label, "Check for Divide-by-zero");
|
|
backend.emitJAL(errorDiv, "Divide-by-zero error");
|
|
backend.emitLocalLabel(label, "Divide since divisor not zero");
|
|
backend.emitREM(Register.A0, Register.A0, Register.T0, "Modulus operation");
|
|
}
|
|
else
|
|
{ // Comparison operators
|
|
//elseBlock = generateLocalLabel();
|
|
String comment="Operator: "+operator;
|
|
if(operator.equals("=="))
|
|
{
|
|
backend.emitXOR(Register.A0, Register.A0, Register.T0, "Check for equality");
|
|
backend.emitSEQZ(Register.A0, Register.A0, "Result is True if XOR equals 0");
|
|
}
|
|
else if(operator.equals("!="))
|
|
{
|
|
backend.emitXOR(Register.A0, Register.A0, Register.T0, "Check for inequality");
|
|
backend.emitSNEZ(Register.A0, Register.A0, "Result is True if XOR does not equal 0");
|
|
}
|
|
else if(operator.equals("<"))
|
|
backend.emitSLT(Register.A0,Register.A0, Register.T0, comment);
|
|
else if(operator.equals(">"))
|
|
backend.emitSLT(Register.A0, Register.T0, Register.A0, comment);
|
|
else if(operator.equals("<="))
|
|
{
|
|
backend.emitADDI(Register.T0,Register.T0, 1, "Increment by 1");
|
|
backend.emitSLT(Register.A0, Register.A0, Register.T0, comment);
|
|
}
|
|
else if(operator.equals(">="))
|
|
{
|
|
backend.emitADDI(Register.A0,Register.A0, 1, "Increment by 1");
|
|
backend.emitSLT(Register.A0, Register.A0, Register.T0, comment);
|
|
}
|
|
else if(operator.equals("is"))
|
|
{
|
|
backend.emitXOR(Register.A0, Register.A0, Register.T0, "is operation");
|
|
backend.emitSEQZ(Register.A0, Register.A0, "Result is True if XOR equals 0");
|
|
}
|
|
else
|
|
{}
|
|
}
|
|
}
|
|
else if(node.left.getInferredType().equals(Type.STR_TYPE) && node.right.getInferredType().equals(Type.STR_TYPE))
|
|
{
|
|
|
|
}
|
|
return A0;
|
|
}
|
|
|
|
@Override
|
|
public Register analyze(UnaryExpr node)
|
|
{
|
|
if(node.operator.equals("-") && node.getInferredType().equals(Type.INT_TYPE))
|
|
{
|
|
node.operand.dispatch(this);
|
|
backend.emitLI(Register.T0, -1, "Set value of Register T0 to -1");
|
|
backend.emitMUL(Register.A0, Register.A0, Register.T0, "Multiply by -1");
|
|
}
|
|
else if(node.operator.equals("not") && node.getInferredType().equals(Type.BOOL_TYPE))
|
|
{
|
|
node.operand.dispatch(this);
|
|
backend.emitSEQZ(Register.T0, Register.A0, "Not operation on Register A0");
|
|
}
|
|
else
|
|
return null;
|
|
return Register.A0;
|
|
}
|
|
|
|
@Override
|
|
public Register analyze(Identifier node)
|
|
{
|
|
backend.emitLW(T6, FP, 0, "Inside Identifier: ");
|
|
if (sym.getParent() == null)
|
|
{
|
|
GlobalVarInfo gvi=(GlobalVarInfo) sym.get(node.name);
|
|
backend.emitLW(Register.A0, gvi.getLabel(), "Load global: "+gvi.getVarName());
|
|
}
|
|
else
|
|
{
|
|
// FIXME: This breaks, so had to comment it
|
|
// VarInfo svi = (VarInfo) sym.get(node.name);
|
|
// int loc = offsetMap.get(svi);
|
|
// backend.emitLW(Register.A0, Register.FP, -loc*4, "Load local variable: "+svi.getVarName());
|
|
}
|
|
return null;
|
|
}
|
|
|
|
@Override
|
|
public Register analyze(VarDef node)
|
|
{
|
|
StackVarInfo svi = (StackVarInfo) sym.get(node.var.identifier.name);
|
|
node.value.dispatch(this);
|
|
backend.emitSW(Register.A0, Register.FP, -sp_off*wordSize, "Store variable "+node.var.identifier.name+" value in Stack");
|
|
offsetMap.put(svi, sp_off);
|
|
sp_off++;
|
|
return null;
|
|
}
|
|
|
|
@Override
|
|
public Register analyze(WhileStmt node)
|
|
{
|
|
Label startLoop = generateLocalLabel();
|
|
backend.emitLocalLabel(startLoop, "Beginning of while loop");
|
|
node.condition.dispatch(this);
|
|
Label endLoop = elseBlock;
|
|
for(Stmt stmt:node.body)
|
|
stmt.dispatch(this);
|
|
backend.emitJ(startLoop, "Jump to beginning of loop");
|
|
backend.emitLocalLabel(endLoop, "End of while loop");
|
|
|
|
return null;
|
|
}
|
|
|
|
@Override
|
|
public Register analyze(ListExpr node) {
|
|
int l = node.elements.size();
|
|
int i = l;
|
|
for(Expr exp:node.elements)
|
|
{
|
|
Register r = exp.dispatch(this);
|
|
backend.emitSW(r,Register.FP,-sp_off*wordSize,"Push argument "+i+" from last.");
|
|
sp_off++;
|
|
i--;
|
|
}
|
|
backend.emitLI(Register.A0, l, "Pass list length");
|
|
backend.emitSW(Register.A0, Register.FP, -sp_off*wordSize, "Push argument "+i+" from last.");
|
|
sp_off++;
|
|
backend.emitADDI(Register.SP, Register.SP, -sp_off*wordSize, "Set SP to last argument.");
|
|
//TODO: Store reference to variable
|
|
return Register.A0;
|
|
}
|
|
|
|
|
|
|
|
@Override
|
|
public Register analyze(IntegerLiteral node) {
|
|
backend.emitLW(T6, FP, 0, "Inside IntegerLiteral: " + node.value);
|
|
backend.emitLI(A0, node.value, "Load integer literal " + node.value);
|
|
backend.emitJAL(makeintLabel, "Box integer");
|
|
// System.out.println("+++ Inside IntegerLiteral");
|
|
// backend.emitLA(A0, new Label("$int$prototype"), "Load prototype");
|
|
// backend.emitJAL(new Label("ra, alloc"), "");
|
|
// backend.emitLI(T0, node.value, "Load integer " + node.value);
|
|
// backend.emitSW(T0, A0, "@.__int__", null);
|
|
|
|
return A0;
|
|
}
|
|
|
|
|
|
@Override
|
|
public Register analyze(ForStmt node) {
|
|
//System.out.println(node);
|
|
/*
|
|
node.
|
|
Label startLoop = generateLocalLabel();
|
|
backend.emitLocalLabel(startLoop, "Beginning of while loop");
|
|
node.condition.dispatch(this);
|
|
Label endLoop = elseBlock;
|
|
for(Stmt stmt:node.body)
|
|
stmt.dispatch(this);
|
|
backend.emitJ(startLoop, "Jump to beginning of loop");
|
|
backend.emitLocalLabel(endLoop, "End of while loop");*/
|
|
return null;
|
|
|
|
}
|
|
|
|
@Override
|
|
public Register analyze(IndexExpr node)
|
|
{
|
|
incSp(1);
|
|
Register listObj = node.list.dispatch(this);
|
|
backend.emitSW(listObj, FP, -sp_off * wordSize, String.format("Push on stack slot %d", sp_off));
|
|
Register index = node.index.dispatch(this);
|
|
Register vacantReg = (index != A0) ? A0 : A1;
|
|
|
|
if (node.list.getInferredType().isListType()) {
|
|
backend.emitLW(vacantReg, FP, -sp_off * wordSize, String.format("Pop stack slot %d", sp_off));
|
|
|
|
this.d(vacantReg);
|
|
return this.a(vacantReg, index, A0, false);
|
|
}else{
|
|
this.a(0, vacantReg);
|
|
Register a = a(index);
|
|
Label ch = generateLocalLabel();
|
|
backend.emitLW(a, vacantReg, getAttrOffset(strClass, "__len__"), "Load attribute: __len__");
|
|
backend.emitBLTU(index, a, ch, "Ensure 0 <= idx < len");
|
|
backend.emitJ(f, "Go to error handler");
|
|
backend.emitLocalLabel(ch, "Index within bounds");
|
|
this.c(index);
|
|
Register a2 = this.a(false);
|
|
this.a(1);
|
|
return a2;
|
|
}
|
|
}
|
|
|
|
public Register analyze(MemberExpr node)
|
|
{
|
|
ClassInfo objectClass = (ClassInfo) globalSymbols.get(node.object.getInferredType().className());
|
|
Label label = generateLocalLabel();
|
|
Register obj = node.object.dispatch(this);
|
|
|
|
backend.emitBNEZ(obj, label, "Ensure not None");
|
|
backend.emitJ(errorNone, "Go to error handler");
|
|
backend.emitLocalLabel(label, "Not None");
|
|
backend.emitLW(A0, obj, getAttrOffset(objectClass, node.member.name),
|
|
String.format("Get attribute: %s.%s", objectClass.getClassName(), node.member.name));
|
|
return A0;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Emits custom code in the CODE segment.
|
|
*
|
|
* <p>This method is called after emitting the top level and the function bodies for each
|
|
* function.
|
|
*
|
|
* <p>You can use this method to emit anything you want outside of the top level or functions,
|
|
* e.g. custom routines that you may want to call from within your code to do common tasks. This
|
|
* is not strictly needed. You might not modify this at all and still complete the assignment.
|
|
*
|
|
* <p>To start you off, here is an implementation of three routines that will be commonly needed
|
|
* from within the code you will generate for statements.
|
|
*
|
|
* <p>The routines are error handlers for operations on None, index out of bounds, and division
|
|
* by zero. They never return to their caller. Just jump to one of these routines to throw an
|
|
* error and exit the program. For example, to throw an OOB error: backend.emitJ(errorOob, "Go
|
|
* to out-of-bounds error and abort");
|
|
*/
|
|
protected void emitCustomCode() {
|
|
|
|
emitStdFunc("concat");
|
|
emitStdFunc("conslist");
|
|
emitStdFunc("strcat");
|
|
emitStdFunc("streql");
|
|
emitStdFunc("strneql");
|
|
emitStdFunc("makeint");
|
|
emitStdFunc("makebool");
|
|
|
|
emitErrorFunc(errorNone, "Operation on None");
|
|
emitErrorFunc(errorDiv, "Division by zero");
|
|
emitErrorFunc(errorOob, "Index out of bounds");
|
|
// emitErrorFunc(errorNI, "Not Implemented.");
|
|
}
|
|
|
|
/** Emit an error routine labeled ERRLABEL that aborts with message MSG. */
|
|
private void emitErrorFunc(Label errLabel, String msg) {
|
|
backend.emitGlobalLabel(errLabel);
|
|
backend.emitLI(A0, ERROR_NONE, "Exit code for: " + msg);
|
|
backend.emitLA(A1, constants.getStrConstant(msg), "Load error message as str");
|
|
backend.emitADDI(
|
|
A1, A1, getAttrOffset(strClass, "__str__"), "Load address of attribute __str__");
|
|
backend.emitJ(abortLabel, "Abort");
|
|
}
|
|
}
|