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modified: src/main/java/chocopy/pa3/CodeGenImpl.java

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This commit is contained in:
bill
2021-05-04 22:16:58 +08:00
parent 1952bb2d38
commit d7ae4fc9ed
1 changed files with 137 additions and 54 deletions
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src/main/java/chocopy/pa3/CodeGenImpl.java
+137 -54
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@@ -4,6 +4,7 @@ import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Stack;
import chocopy.common.analysis.*;
import chocopy.common.astnodes.*;
@@ -90,6 +91,8 @@ public class CodeGenImpl extends CodeGenBase
{
stmt.dispatch(stmtAnalyzer);
}
stmtAnalyzer.emitSizeLabel();
backend.emitLI(A0, EXIT_ECALL, "Code for ecall: exit");
backend.emitEcall(null);
}
@@ -155,10 +158,8 @@ public class CodeGenImpl extends CodeGenBase
for (Stmt stmt : funcInfo.getStatements()) {
stmt.dispatch(stmtAnalyzer);
}
stmtAnalyzer.emitSizeLabel();
backend.emitJ(stmtAnalyzer.epilogue, "Jump to function epilogue");
// --- Epilogue ---
backend.emitLocalLabel(stmtAnalyzer.epilogue, "Epilogue");
backend.emitLW(RA, FP, -4, "Get return address");
@@ -206,7 +207,7 @@ public class CodeGenImpl extends CodeGenBase
private final FuncInfo funcInfo;
/** Label of code that exits from block. */
protected Label elseBlock;
protected Stack<Label> elseBlock = new Stack<Label>();
/** Variable to keep track of slots of stored variables on stack */
// example usage: backend.emitLW(A0, SP, varSlotMap.get(varName)) to load the variable using its name
@@ -254,7 +255,9 @@ public class CodeGenImpl extends CodeGenBase
max_sp = max_sp >= sp_off?max_sp:sp_off;
}
public void emitSizeLabel(){
backend.defineSym(size_label, max_sp*wordSize);
}
// *********** functions start ***********
@@ -263,8 +266,7 @@ public class CodeGenImpl extends CodeGenBase
System.out.println("Inside CallExpr: " + node.function.name);
backend.emitLW(T6, FP, 0, "Inside CallExpr: " + node.function.name);
// FIXME: Why are we using globalSymbols here but not the sym???
SymbolInfo Ty = globalSymbols.get(node.function.name);
SymbolInfo Ty = sym.get(node.function.name);
if(Ty instanceof ClassInfo){
//object create
ClassInfo cls = (ClassInfo) Ty;
@@ -301,6 +303,18 @@ public class CodeGenImpl extends CodeGenBase
List<Expr> args = node.args;
int spaceRequiredForArgs = (args.size() + 1)*4;
int depth = calleeFunctionInfo.getDepth();
int tmpHandle = getRegister();
Register tmp = registerPool[tmpHandle];
FuncInfo currFuncInfo = calleeFunctionInfo;
backend.emitMV(tmp, FP, "Load FP");
while (depth > 0) {
final FuncInfo parentFuncInfo = currFuncInfo.getParentFuncInfo();
backend.emitLW(tmp, tmp, parentFuncInfo.getParams().size()*wordSize, "Load static link to " + parentFuncInfo.getFuncName());
currFuncInfo = parentFuncInfo;
--depth;
}
freeRegister(tmpHandle);
//backend.emitSW(A0, SP, -4, "Put static link");
for (int i = 0; i < args.size(); i++) {
int argNum = i + 1;
@@ -312,13 +326,13 @@ public class CodeGenImpl extends CodeGenBase
StackVarInfo formalParamInfo = (StackVarInfo) calleeFunctionInfo.getSymbolTable().get(formalParamName);
if (expr.getInferredType().equals(Type.INT_TYPE)) {
if (formalParamInfo.getVarType().equals(Type.OBJECT_TYPE) || formalParamInfo.getVarType().equals(Type.INT_TYPE)) {
if ((functionId.name.equals("print")) &&(formalParamInfo.getVarType().equals(Type.OBJECT_TYPE) || formalParamInfo.getVarType().equals(Type.INT_TYPE))) {
backend.emitJAL(makeintLabel, "Box integer");
} else {
// FIXME: passed argument does not match formal parameter
}
} else if (expr.getInferredType().equals(Type.BOOL_TYPE)) {
if (formalParamInfo.getVarType().equals(Type.OBJECT_TYPE) || formalParamInfo.getVarType().equals(Type.BOOL_TYPE)) {
if ((functionId.name.equals("print"))&&(formalParamInfo.getVarType().equals(Type.OBJECT_TYPE) || formalParamInfo.getVarType().equals(Type.BOOL_TYPE))) {
backend.emitJAL(makeboolLabel, "Box boolean");
} else {
// FIXME: passed argument does not match formal parameter
@@ -331,7 +345,8 @@ public class CodeGenImpl extends CodeGenBase
}
backend.emitADDI(SP, SP, -spaceRequiredForArgs, "Set SP to last argument.");
backend.emitJAL(new Label("$"+functionId.name), "Invoke function: " + functionId.name);
String label_str = "$"+calleeFunctionInfo.getFuncName();
backend.emitJAL(new Label(label_str), "Invoke function: " + label_str);
backend.emitADDI(SP, SP, spaceRequiredForArgs, "Set SP to stack frame top.");
}
return A0;
@@ -355,8 +370,11 @@ public class CodeGenImpl extends CodeGenBase
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);
ClassInfo objectClass = null;
if(node.method.object instanceof CallExpr)
objectClass = (ClassInfo)globalSymbols.get(((CallExpr)node.method.object).getInferredType().className());
else
objectClass = (ClassInfo)globalSymbols.get(node.method.object.getInferredType().className());
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));
@@ -419,7 +437,54 @@ public class CodeGenImpl extends CodeGenBase
backend.emitLI(Register.A0, 0, "Load boolean literal: false ");
return Register.A0;
}
class StackVarRuntimeInfo {
public final int off;
public final Register sl;
public int regHandle;
StackVarRuntimeInfo(Register sl, int off){
this.off = off;
this.sl = sl;
regHandle = -1;
}
StackVarRuntimeInfo(Register sl, int off, int regHandle){
this.off = off;
this.sl = sl;
this.regHandle = regHandle;
}
public void free(){
if(regHandle > 0){
freeRegister(regHandle);
regHandle = -1;
}
}
}
private Object getVar(Identifier id){
SymbolInfo info = sym.get(id.name);
if(info instanceof StackVarInfo)
return getStackVar((StackVarInfo)info);
else
return ((GlobalVarInfo)info).getLabel();
}
private StackVarRuntimeInfo getStackVar(StackVarInfo info){
int curr_depth = funcInfo.getDepth();
int d_depth = curr_depth - info.getFuncInfo().getDepth();
if(d_depth == 0)
return new StackVarRuntimeInfo(SP, varSlotMap.get(info.getVarName()));
else
{
FuncInfo curr = funcInfo;
int tmpHandle = getRegister();
Register tmp = registerPool[tmpHandle];
backend.emitMV(tmp, FP, "tmp = FP");
while(d_depth > 0){
curr = curr.getParentFuncInfo();
backend.emitLW(tmp, tmp, curr.getParams().size()*wordSize, "Get static link");
-- d_depth;
}
// UNSAFE!!!!! PLEASE FREE THE TMP_HANDLE MANUALLY
return new StackVarRuntimeInfo(tmp, -wordSize*curr.getVarIndex(info.getVarName()), tmpHandle);
}
}
@Override
public Register analyze(AssignStmt node)
@@ -432,27 +497,24 @@ public class CodeGenImpl extends CodeGenBase
Register reg = node.value.dispatch(this);
if (reg == null)
reg = A0;
if (sym.getParent() == null)
for(Expr target: node.targets)
{
for(Expr target: node.targets)
if(target instanceof Identifier)
{
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)");
}
Identifier targetID = (Identifier)target;
Object var = getVar(targetID);
if(var instanceof StackVarRuntimeInfo){
StackVarRuntimeInfo rtinfo = (StackVarRuntimeInfo) var;
backend.emitSW(reg, rtinfo.sl, rtinfo.off ,"Store local variable: "+((Identifier)target).name);
rtinfo.free();
}
else
{
Register ret = target.dispatch(this);
backend.emitSW(T1, ret, 0, "Set list element");
}
backend.emitSW(reg, (Label)var, T0, "Store Global variable: " + ((Identifier)targetID).name);
}
}
else
{
for(Expr target: node.targets)
else
{
backend.emitLW(reg, SP, varSlotMap.get(((Identifier)target).name),"Load local variable: "+((Identifier)target).name);
Register ret = target.dispatch(this);
backend.emitSW(T1, ret, 0, "Set list element");
}
}
//}
@@ -478,8 +540,10 @@ public class CodeGenImpl extends CodeGenBase
backend.emitBEQZ(result, ln,"Jump to end of loop");
node.thenExpr.dispatch(this);
backend.emitJ(ln, "Jump to end of if expression");
backend.emitLocalLabel(elseBlock, "Else part of if expression");
elseBlock.push(generateLocalLabel());
backend.emitLocalLabel(elseBlock.peek(), "Else part of if expression");
node.elseExpr.dispatch(this);
elseBlock.pop();
backend.emitLocalLabel(ln, "End of if expression");
return A0;
}
@@ -495,9 +559,11 @@ public class CodeGenImpl extends CodeGenBase
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");
elseBlock.push(generateLocalLabel());
backend.emitLocalLabel(elseBlock.peek(), "Else part of if statement");
for(Stmt s:node.elseBody)
s.dispatch(this);
elseBlock.pop();
backend.emitLocalLabel(ln, "End of if statement");
return null;
}
@@ -782,29 +848,37 @@ public class CodeGenImpl extends CodeGenBase
backend.emitJAL(errorNI, "Operator not implemented");
return Register.A0;
}
private SymbolInfo getSymbolInfo(Identifier id){
SymbolTable curr_sym = sym;
SymbolInfo info = null;
String id_name = id.name;
while(curr_sym != null){
info = (SymbolInfo) curr_sym.get(id_name);
if(info != null)
return info;
curr_sym = curr_sym.getParent();
}
return info;
}
@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
{
backend.emitLW(Register.A0, SP, varSlotMap.get(node.name),"Load local variable: "+node.name);
Identifier targetID = (Identifier)node;
Object var = getVar(targetID);
if(var instanceof StackVarRuntimeInfo){
StackVarRuntimeInfo rtinfo = (StackVarRuntimeInfo) var;
backend.emitLW(A0, rtinfo.sl, rtinfo.off,"Load local variable: "+node.name);
rtinfo.free();
}
else
backend.emitLW(A0, (Label) var, "Load local variable: "+node.name);
return Register.A0;
}
@Override
public Register analyze(VarDef node)
{
return null;
}
@Override
public Register analyze(WhileStmt node)
{
@@ -812,7 +886,7 @@ public class CodeGenImpl extends CodeGenBase
Label startLoop = generateLocalLabel();
backend.emitLocalLabel(startLoop, "Beginning of while loop");
Register result = node.condition.dispatch(this);
Label endLoop = elseBlock;
Label endLoop = generateLocalLabel();
backend.emitBEQZ(result, endLoop,"Jump to end of the loop");
for(Stmt stmt:node.body)
@@ -900,13 +974,18 @@ public class CodeGenImpl extends CodeGenBase
backend.emitMUL(iden, iden, ln, "Compute list element offset in bytes");
backend.emitADD(iden, l, iden, "Pointer to list element");
backend.emitLW(iden, iden, 0, "Set list element");
if(sym.getParent() == null)
SymbolInfo info = sym.get(node.identifier.name);
if(info instanceof GlobalVarInfo)
{
GlobalVarInfo gvi=(GlobalVarInfo) sym.get(node.identifier.name);
GlobalVarInfo gvi=(GlobalVarInfo) info;
backend.emitSW(iden, gvi.getLabel(), Register.T0, "Assign global: "+node.identifier.name+"(using tmp register)");
}
else
backend.emitSW(iden, SP, varSlotMap.get(node.identifier.name),"Store local variable: "+node.identifier.name);
{
StackVarRuntimeInfo rtinfo = (StackVarRuntimeInfo) getVar(node.identifier);
backend.emitSW(iden, rtinfo.sl, rtinfo.off,"Store local variable: "+node.identifier.name);
rtinfo.free();
}
for(Stmt stmt:node.body)
stmt.dispatch(this);
backend.emitADDI(iter, iter, 1, "Increment counter");
@@ -938,14 +1017,18 @@ public class CodeGenImpl extends CodeGenBase
backend.emitADDI(iden, iter, 4 * wordSize, "Convert index to offset to char in bytes");
backend.emitLBU(iden, iden, 0, "Load character");
if(sym.getParent() == null)
SymbolInfo info = sym.get(node.identifier.name);
if(info instanceof GlobalVarInfo)
{
GlobalVarInfo gvi=(GlobalVarInfo) sym.get(node.identifier.name);
GlobalVarInfo gvi=(GlobalVarInfo) info;
backend.emitSW(iden, gvi.getLabel(), Register.T0, "Assign global: "+node.identifier.name+"(using tmp register)");
}
else
backend.emitSW(iden, SP, varSlotMap.get(node.identifier.name),"Store local variable: "+node.identifier.name);
{
StackVarRuntimeInfo rtinfo = (StackVarRuntimeInfo) getVar(node.identifier);
backend.emitSW(iden, rtinfo.sl, rtinfo.off,"Store local variable: "+node.identifier.name);
rtinfo.free();
}
for(Stmt stmt:node.body)
stmt.dispatch(this);
backend.emitADDI(iter, iter, 1, "Increment counter");