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Added support for Strings

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This commit is contained in:
Apoorva Ranade
2021-05-05 21:42:38 +05:30
parent a23d39eb02
commit 08ddb39134
3 changed files with 50 additions and 8 deletions
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src/main/java/chocopy/pa3/CodeGenImpl.java
+26 -8
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@@ -39,9 +39,9 @@ public class CodeGenImpl extends CodeGenBase
protected final Label strcatLabel = new Label("strcat");
protected final Label concatLabel = new Label("concat");
protected final Label conslistLabel = new Label("conslist");
protected final Label initcharsLabel = new Label("initchars");
protected final Label allCharsLabel = new Label("allChars");
/** Operation on None. */
private final Label errorNone = new Label("error.None");
@@ -86,7 +86,7 @@ public class CodeGenImpl extends CodeGenBase
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.");
backend.emitJAL(initcharsLabel,"Initialize one-character strings");
for (Stmt stmt : statements)
{
stmt.dispatch(stmtAnalyzer);
@@ -1008,7 +1008,7 @@ public class CodeGenImpl extends CodeGenBase
r=getRegister();
regs.add(r);
Register iter = registerPool[r];
backend.emitSW(l, Register.FP, -sp_off*wordSize, "Store index on stack");
backend.emitSW(l, Register.FP, -sp_off*wordSize, "Store location on stack");
incSp(1);
backend.emitMV(iter, Register.ZERO, "Initialize index variable");
backend.emitSW(iter, Register.FP, -sp_off*wordSize, "Store index on stack");
@@ -1048,6 +1048,7 @@ public class CodeGenImpl extends CodeGenBase
{
Label startLoop = generateLocalLabel();
Label endLoop = generateLocalLabel();
//Label temp = generateLocalLabel();
r=getRegister();
regs.add(r);
Register iden = registerPool[r];
@@ -1058,17 +1059,33 @@ public class CodeGenImpl extends CodeGenBase
r=getRegister();
regs.add(r);
Register ln = registerPool[r];
//backend.emitBNEZ(Register.A0, temp, "Ensure not none");
//backend.emitJ(errorNone, "Empty String");
//backend.emitLocalLabel(temp, "Continue execution for for-loop");
backend.emitMV(l,Register.A0,"Location of String");
r=getRegister();
regs.add(r);
Register iter = registerPool[r];
backend.emitSW(l, Register.FP, -sp_off*wordSize, "Store location on stack");
incSp(1);
backend.emitMV(iter, Register.ZERO, "Initialize index variable");
backend.emitSW(iter, Register.FP, -sp_off*wordSize, "Store index on stack");
incSp(1);
backend.emitLocalLabel(startLoop, "Start for loop");
backend.emitLW(iter, Register.FP, -(sp_off-1)*wordSize, "Load index from stack");
backend.emitLW(l, Register.FP, -(sp_off-2)*wordSize, "Store string location from stack");
backend.emitLW(ln, l, getAttrOffset(strClass, "__len__"), "Get attribute __len__");
backend.emitBGE(iter, ln, endLoop, "Jump to end loop if counter exceeds length");
backend.emitBGEU(iter, ln, endLoop, "Jump to end loop if counter exceeds length");
backend.emitADDI(iter, iter, 1, "Increment counter");
backend.emitSW(iter, Register.FP, -sp_off*wordSize, "Store index on stack");
incSp(1);
backend.emitADDI(iden, iter, 4 * wordSize, "Convert index to offset to char in bytes");
backend.emitADD(iden, l, iden, "Get pointer to char");
backend.emitLBU(iden, iden, 0, "Load character");
backend.emitLI(iter, 20, "Load register");
backend.emitMUL(iden, iden, iter, "Multiply by size of String object");
backend.emitLA(l, allCharsLabel, "Index into single-char table");
backend.emitADD(l, l, iden, "Add size to chartable index");
SymbolInfo info = sym.get(node.identifier.name);
if(info instanceof GlobalVarInfo)
{
@@ -1083,7 +1100,6 @@ public class CodeGenImpl extends CodeGenBase
}
for(Stmt stmt:node.body)
stmt.dispatch(this);
backend.emitADDI(iter, iter, 1, "Increment counter");
backend.emitJ(startLoop, "Jump to beginning of loop");
backend.emitLocalLabel(endLoop, "End of for loop");
}
@@ -1196,6 +1212,8 @@ public class CodeGenImpl extends CodeGenBase
emitStdFunc("strneql");
emitStdFunc("makeint");
emitStdFunc("makebool");
emitStdFunc("initchars");
emitStdFunc("allChars");
emitErrorFunc(errorNone, "Operation on None");
emitErrorFunc(errorDiv, "Division by zero");