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fix(qbe): hCast passthrough, logical ops =w→=l, implicit ret, && rVal string bug

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This commit is contained in:
dimgigov
2026-06-02 12:50:51 +03:00
parent 87e8b08fc8
commit 8d0841b6be
2 changed files with 38 additions and 44 deletions
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_selfhost/src/qbe_backend.bux
+19 -22
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@@ -421,14 +421,15 @@ func QBE_EmitExpr(qbe: *QbeEmitter, node: *HirNode) -> String {
let rVal: String = QBE_EmitExpr(qbe, node.child2);
QBE_EmitIndent(qbe);
QBE_Emit(qbe, tmp);
QBE_EmitLine(qbe, " =w copy rVal");
QBE_Emit(qbe, " =l copy ");
QBE_EmitLine(qbe, rVal);
QBE_EmitIndent(qbe);
QBE_Emit(qbe, "jmp ");
QBE_EmitLine(qbe, lEnd);
QBE_EmitLine(qbe, lFalse);
QBE_EmitIndent(qbe);
QBE_Emit(qbe, tmp);
QBE_EmitLine(qbe, " =w copy 0");
QBE_EmitLine(qbe, " =l copy 0");
QBE_EmitLine(qbe, lEnd);
return tmp;
}
@@ -447,7 +448,7 @@ func QBE_EmitExpr(qbe: *QbeEmitter, node: *HirNode) -> String {
QBE_EmitLine(qbe, lTrue);
QBE_EmitIndent(qbe);
QBE_Emit(qbe, tmp);
QBE_EmitLine(qbe, " =w copy 1");
QBE_EmitLine(qbe, " =l copy 1");
QBE_EmitIndent(qbe);
QBE_Emit(qbe, "jmp ");
QBE_EmitLine(qbe, lEnd);
@@ -455,7 +456,7 @@ func QBE_EmitExpr(qbe: *QbeEmitter, node: *HirNode) -> String {
let rVal: String = QBE_EmitExpr(qbe, node.child2);
QBE_EmitIndent(qbe);
QBE_Emit(qbe, tmp);
QBE_Emit(qbe, " =w copy ");
QBE_Emit(qbe, " =l copy ");
QBE_EmitLine(qbe, rVal);
QBE_EmitLine(qbe, lEnd);
return tmp;
@@ -567,25 +568,9 @@ func QBE_EmitExpr(qbe: *QbeEmitter, node: *HirNode) -> String {
return tmp;
}
// Cast
// Cast — QBE doesn't need same-width casts; passthrough
if kind == hCast {
let src: String = QBE_EmitExpr(qbe, node.child1);
let dstTy: String = QbeBackend_TypeWord(node.typeKind);
let srcTy: String = QbeBackend_TypeWord(node.child1.typeKind);
if String_Eq(dstTy, srcTy) {
return src;
}
let tmp: String = QBE_FreshTemp(qbe);
QBE_EmitIndent(qbe);
QBE_Emit(qbe, tmp);
QBE_Emit(qbe, " =");
QBE_Emit(qbe, dstTy);
// QBE cast instructions: extsw, extuw, extsl, extul, truncl, stosi, etc.
// For simplicity, use copy for now and let QBE handle it
QBE_Emit(qbe, " copy ");
QBE_Emit(qbe, src);
QBE_EmitLine(qbe, "");
return tmp;
return QBE_EmitExpr(qbe, node.child1);
}
// SizeOf
@@ -857,6 +842,18 @@ func QBE_EmitFunc(qbe: *QbeEmitter, f: *HirFunc) {
// Body
QBE_EmitStmt(qbe, f.body);
// Implicit ret 0 for functions without explicit return
if !QBE_IsTerminator(f.body) {
if !String_Eq(retTy, "") {
QBE_EmitIndent(qbe);
QBE_Emit(qbe, "ret 0");
QBE_EmitLine(qbe, "");
} else {
QBE_EmitIndent(qbe);
QBE_EmitLine(qbe, "ret");
}
}
QBE_EmitLine(qbe, "}");
QBE_EmitLine(qbe, "");
}