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master
Apoorva Ranade 5 years ago
parent c02b36d305 b8600746cf
commit 115906ac11
1 changed files with 266 additions and 71 deletions
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src/main/java/chocopy/pa3/CodeGenImpl.java
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@ -1,12 +1,5 @@
package chocopy.pa3;
import static chocopy.common.codegen.RiscVBackend.Register.A0;
import static chocopy.common.codegen.RiscVBackend.Register.A1;
import static chocopy.common.codegen.RiscVBackend.Register.FP;
import static chocopy.common.codegen.RiscVBackend.Register.RA;
import static chocopy.common.codegen.RiscVBackend.Register.SP;
import static chocopy.common.codegen.RiscVBackend.Register.ZERO;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
@ -17,12 +10,10 @@ import chocopy.common.astnodes.*;
import chocopy.common.analysis.types.*;
import chocopy.common.codegen.*;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import static chocopy.common.codegen.RiscVBackend.Register.*;
import chocopy.common.codegen.RiscVBackend.Register;
/**
* This is where the main implementation of PA3 will live.
*
@ -44,6 +35,68 @@ public class CodeGenImpl extends CodeGenBase
public CodeGenImpl(RiscVBackend backend)
{
super(backend);
}
/**
* Generates assembly code for PROGRAM.
*
* <p>This is the main driver that calls internal methods for emitting DATA section (globals,
* constants, prototypes, etc) as well as the the CODE section (predefined functions, built-in
* routines, and user-defined functions).
*/
@Override
public void generate(Program program) {
System.out.println("Inside generate");
analyzeProgram(program);
backend.startData();
for (ClassInfo classInfo : this.classes) {
emitPrototype(classInfo);
}
for (ClassInfo classInfo : this.classes) {
emitDispatchTable(classInfo);
}
for (GlobalVarInfo global : this.globalVars) {
backend.emitGlobalLabel(global.getLabel());
emitConstant(
global.getInitialValue(),
global.getVarType(),
String.format("Initial value of global var: %s", global.getVarName()));
}
backend.startCode();
Label mainLabel = new Label("main");
backend.emitGlobalLabel(mainLabel);
backend.emitLUI(A0, HEAP_SIZE_BYTES >> 12, "Initialize heap size (in multiples of 4KB)");
backend.emitADD(S11, S11, A0, "Save heap size");
backend.emitJAL(heapInitLabel, "Call heap.init routine");
backend.emitMV(GP, A0, "Initialize heap pointer");
backend.emitMV(S10, GP, "Set beginning of heap");
backend.emitADD(S11, S10, S11, "Set end of heap (= start of heap + heap size)");
backend.emitMV(RA, ZERO, "No normal return from main program.");
backend.emitMV(FP, ZERO, "No preceding frame.");
emitTopLevel(program.statements);
for (FuncInfo funcInfo : this.functions) {
funcInfo.emitBody();
}
emitStdFunc("alloc");
emitStdFunc("alloc2");
emitStdFunc("abort");
emitStdFunc("heap.init");
emitStdFunc("makeint");
emitCustomCode();
backend.startData();
emitConstants();
}
/** Operation on None. */
@ -56,6 +109,11 @@ public class CodeGenImpl extends CodeGenBase
/** Not implemented. */
private final Label errorNI = new Label("error.NI");
/** Label for built-in routine: makeint. */
protected final Label makeIntLabel = new Label("makeint");
/**
* Emits the top level of the program.
*
@ -97,17 +155,54 @@ public class CodeGenImpl extends CodeGenBase
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++;
}
for (Stmt stmt : funcInfo.getStatements())
{
// --- 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");
backend.emitMV(A0, ZERO, "Returning None implicitly");
backend.emitLocalLabel(stmtAnalyzer.epilogue, "Epilogue");
// FIXME: {... reset fp etc. ...}
// --- 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");
}
@ -183,7 +278,13 @@ public class CodeGenImpl extends CodeGenBase
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
@ -215,43 +316,149 @@ public class CodeGenImpl extends CodeGenBase
-- sp_off;
backend.emitLW(A0, FP, -sp_off*wordSize, String.format("Pop stack slot %d", sp_off));
} else {
//func call
// 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;
}
@Override
public Register analyze(FuncDef node) {
backend.emitLW(T6, FP, 0, "Inside FuncDef: " + node.name);
// function
return null;
}
@Override
public Register analyze(GlobalDecl node) {
backend.emitLW(T6, FP, 0, "Inside GlobalDecl: ");
// function
return null;
}
@Override
public Register analyze(NonLocalDecl node) {
backend.emitLW(T6, FP, 0, "Inside NonLocalDecl: ");
// function
return null;
}
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(IntegerLiteral node)
{
backend.emitLI(Register.A0, node.value, "Load integer literal "+node.value);
return Register.A0;
}
// FIXME: This is not correct. We need to use $int$prototype to create an integer literal, so commenting it
// @Override
// public Register analyze(IntegerLiteral node)
// {
// backend.emitLI(Register.A0, node.value, "Load integer literal "+node.value);
// 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())
{
@ -284,9 +491,11 @@ public class CodeGenImpl extends CodeGenBase
@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)
{
@ -299,6 +508,7 @@ public class CodeGenImpl extends CodeGenBase
backend.emitLocalLabel(ln, "End of if expression");
return null;
}
@Override
public Register analyze(IfStmt node)
{
@ -381,6 +591,8 @@ public class CodeGenImpl extends CodeGenBase
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.right.dispatch(this);
@ -535,6 +747,7 @@ public class CodeGenImpl extends CodeGenBase
}
return null;
}
@Override
public Register analyze(UnaryExpr node)
{
@ -557,6 +770,7 @@ public class CodeGenImpl extends CodeGenBase
@Override
public Register analyze(Identifier node)
{
backend.emitLW(T6, FP, 0, "Inside Identifier: ");
if (sym.getParent() == null)
{
GlobalVarInfo gvi=(GlobalVarInfo) sym.get(node.name);
@ -564,12 +778,14 @@ public class CodeGenImpl extends CodeGenBase
}
else
{
StackVarInfo svi = (StackVarInfo) sym.get(node.name);
int loc = offsetMap.get(svi);
backend.emitLW(Register.A0, Register.FP, -loc*4, "Load local variable: "+svi.getVarName());
// 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)
{
@ -592,8 +808,10 @@ public class CodeGenImpl extends CodeGenBase
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();
@ -619,9 +837,26 @@ public class CodeGenImpl extends CodeGenBase
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);
//System.out.println(node);
/*
node.
Label startLoop = generateLocalLabel();
@ -636,15 +871,13 @@ public class CodeGenImpl extends CodeGenBase
}
@Override
public Register analyze(IndexExpr node)
{
System.out.println(node);
//System.out.println(node);
return defaultAction(node);
}
public Register analyze(MemberExpr node)
{
ClassInfo objectClass = (ClassInfo) globalSymbols.get(node.object.getInferredType().className());
@ -658,44 +891,6 @@ public class CodeGenImpl extends CodeGenBase
String.format("Get attribute: %s.%s", objectClass.getClassName(), node.member.name));
return A0;
}
public Register analyze(MethodCallExpr node)
{
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;
}
public Register analyze(ReturnStmt node)
{
return null;
}
}
/**

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