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feat: implements overflow runtime error handling

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This commit is contained in:
Guy C
2025-02-27 19:55:35 +00:00
parent ea262e9a56
commit 9e6970de62
2 changed files with 23 additions and 2 deletions
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5
src/main/wacc/backend/RuntimeErrors.scala
View File

@@ -27,4 +27,9 @@ object RuntimeErrors {
"fatal error: null pair dereferenced or freed",
".L._errNullPtr"
)
val overflowError = RuntimeError(
".L._errOverflow_str0",
"fatal error: integer overflow or underflow occurred",
".L._errOverflow"
)
}

20
src/main/wacc/backend/asmGenerator.scala
View File

@@ -66,6 +66,7 @@ object asmGenerator {
} ++ zeroDivError.stringDef
++ badChrError.stringDef
++ nullPtrError.stringDef // TODO COLLATE TO ONE LIST INSTANCE
++ overflowError.stringDef
Chain(
Directive.IntelSyntax,
@@ -186,7 +187,7 @@ object asmGenerator {
stackAlign,
Load(RDI, IndexAddress(RIP, LabelArg(badChrError.strLabel))),
assemblyIR.Call(CLibFunc.PrintF),
Move(RDI, ImmediateVal(-1)),
Move(RDI, ImmediateVal(255)),
assemblyIR.Call(CLibFunc.Exit)
)
@@ -199,6 +200,15 @@ object asmGenerator {
assemblyIR.Call(CLibFunc.Exit)
)
chain ++= Chain(
LabelDef(overflowError.errLabel),
stackAlign,
Load(RDI, IndexAddress(RIP, LabelArg(overflowError.strLabel))),
assemblyIR.Call(CLibFunc.PrintF),
Move(RDI, ImmediateVal(255)),
assemblyIR.Call(CLibFunc.Exit)
)
chain
}
@@ -345,7 +355,11 @@ object asmGenerator {
chain += Move(EAX, MemLocation(RAX, D32))
chain += stack.push(D32, RAX)
case UnaryOperator.Negate =>
chain += Negate(stack.head)
chain += Xor(EAX, EAX)
chain += Subtract(EAX, stack.head)
chain += Jump(LabelArg(overflowError.errLabel), Cond.Overflow)
chain += stack.drop()
chain += stack.push(Q64, RAX)
case UnaryOperator.Not =>
chain += Xor(stack.head, ImmediateVal(1))
}
@@ -359,12 +373,14 @@ object asmGenerator {
op match {
case BinaryOperator.Add =>
chain += Add(stack.head, destX)
chain += Jump(LabelArg(overflowError.errLabel), Cond.Overflow)
case BinaryOperator.Sub =>
chain += Subtract(destX, stack.head)
chain += stack.drop()
chain += stack.push(destX.size, RAX)
case BinaryOperator.Mul =>
chain += Multiply(destX, stack.head)
chain += Jump(LabelArg(overflowError.errLabel), Cond.Overflow)
chain += stack.drop()
chain += stack.push(destX.size, RAX)