From 6b5ac4fe191a277b3f6c129e75e62c25e70ed017 Mon Sep 17 00:00:00 2001
From: motiejus <foo@bar>
Date: Fri, 8 Nov 2024 19:12:33 +0200
Subject: [PATCH] 0.10.0-1638-g7199d7c777: re-add @qualCast
---
src/AstGen.zig | 2 ++
src/BuiltinFn.zig | 8 ++++++++
src/Sema.zig | 44 ++++++++++++++++++++++++++++++++++++++++++++
src/Zir.zig | 6 ++++++
src/print_zir.zig | 1 +
5 files changed, 61 insertions(+)
diff --git a/src/AstGen.zig b/src/AstGen.zig
index 40eef32d4e..f04713fab5 100644
--- a/src/AstGen.zig
+++ b/src/AstGen.zig
@@ -2531,6 +2531,7 @@ fn addEnsureResult(gz: *GenZir, maybe_unused_result: Zir.Inst.Ref, statement: As
.bit_size_of,
.typeof_log2_int_type,
.ptr_to_int,
+ .qual_cast,
.align_of,
.bool_to_int,
.embed_file,
@@ -8038,6 +8039,7 @@ fn builtinCall(
.float_cast => return typeCast(gz, scope, ri, node, params[0], params[1], .float_cast),
.int_cast => return typeCast(gz, scope, ri, node, params[0], params[1], .int_cast),
.ptr_cast => return typeCast(gz, scope, ri, node, params[0], params[1], .ptr_cast),
+ .qual_cast => return typeCast(gz, scope, ri, node, params[0], params[1], .qual_cast),
.truncate => return typeCast(gz, scope, ri, node, params[0], params[1], .truncate),
// zig fmt: on
diff --git a/src/BuiltinFn.zig b/src/BuiltinFn.zig
index 20edbabe47..78d492a99b 100644
--- a/src/BuiltinFn.zig
+++ b/src/BuiltinFn.zig
@@ -76,6 +76,7 @@ pub const Tag = enum {
prefetch,
ptr_cast,
ptr_to_int,
+ qual_cast,
rem,
return_address,
select,
@@ -683,6 +684,13 @@ pub const list = list: {
.param_count = 1,
},
},
+ .{
+ "@qualCast",
+ .{
+ .tag = .qual_cast,
+ .param_count = 2,
+ },
+ },
.{
"@rem",
.{
diff --git a/src/Sema.zig b/src/Sema.zig
index cf6350e35f..f76c5bd3c4 100644
--- a/src/Sema.zig
+++ b/src/Sema.zig
@@ -1015,6 +1015,7 @@ fn analyzeBodyInner(
.float_cast => try sema.zirFloatCast(block, inst),
.int_cast => try sema.zirIntCast(block, inst),
.ptr_cast => try sema.zirPtrCast(block, inst),
+ .qual_cast => try sema.zirQualCast(block, inst),
.truncate => try sema.zirTruncate(block, inst),
.align_cast => try sema.zirAlignCast(block, inst),
.has_decl => try sema.zirHasDecl(block, inst),
@@ -19661,6 +19662,49 @@ fn zirPtrCast(sema: *Sema, block: *Block, inst: Zir.Inst.Index) CompileError!Air
return block.addBitCast(aligned_dest_ty, ptr);
}
+fn zirQualCast(sema: *Sema, block: *Block, inst: Zir.Inst.Index) CompileError!Air.Inst.Ref {
+ const inst_data = sema.code.instructions.items(.data)[inst].pl_node;
+ const src = inst_data.src();
+ const dest_ty_src: LazySrcLoc = .{ .node_offset_builtin_call_arg0 = inst_data.src_node };
+ const operand_src: LazySrcLoc = .{ .node_offset_builtin_call_arg1 = inst_data.src_node };
+ const extra = sema.code.extraData(Zir.Inst.Bin, inst_data.payload_index).data;
+ const dest_ty = try sema.resolveType(block, dest_ty_src, extra.lhs);
+ const operand = try sema.resolveInst(extra.rhs);
+ const operand_ty = sema.typeOf(operand);
+
+ try sema.checkPtrType(block, dest_ty_src, dest_ty);
+ try sema.checkPtrOperand(block, operand_src, operand_ty);
+
+ var operand_payload = operand_ty.ptrInfo();
+ var dest_info = dest_ty.ptrInfo();
+
+ operand_payload.data.mutable = dest_info.data.mutable;
+ operand_payload.data.@"volatile" = dest_info.data.@"volatile";
+
+ const altered_operand_ty = Type.initPayload(&operand_payload.base);
+ if (!altered_operand_ty.eql(dest_ty, sema.mod)) {
+ const msg = msg: {
+ const msg = try sema.errMsg(block, src, "'@qualCast' can only modify 'const' and 'volatile' qualifiers", .{});
+ errdefer msg.destroy(sema.gpa);
+
+ dest_info.data.mutable = !operand_ty.isConstPtr();
+ dest_info.data.@"volatile" = operand_ty.isVolatilePtr();
+ const altered_dest_ty = Type.initPayload(&dest_info.base);
+ try sema.errNote(block, src, msg, "expected type '{}'", .{altered_dest_ty.fmt(sema.mod)});
+ try sema.errNote(block, src, msg, "got type '{}'", .{operand_ty.fmt(sema.mod)});
+ break :msg msg;
+ };
+ return sema.failWithOwnedErrorMsg(msg);
+ }
+
+ if (try sema.resolveMaybeUndefVal(operand)) |operand_val| {
+ return sema.addConstant(dest_ty, operand_val);
+ }
+
+ try sema.requireRuntimeBlock(block, src, null);
+ return block.addBitCast(dest_ty, operand);
+}
+
fn zirConstCast(sema: *Sema, block: *Block, extended: Zir.Inst.Extended.InstData) CompileError!Air.Inst.Ref {
const extra = sema.code.extraData(Zir.Inst.UnNode, extended.operand).data;
const src = LazySrcLoc.nodeOffset(extra.node);
diff --git a/src/Zir.zig b/src/Zir.zig
index 58f9fdff14..338712c0b7 100644
--- a/src/Zir.zig
+++ b/src/Zir.zig
@@ -857,6 +857,9 @@ pub const Inst = struct {
/// Implements the `@ptrCast` builtin.
/// Uses `pl_node` with payload `Bin`. `lhs` is dest type, `rhs` is operand.
ptr_cast,
+ /// Implements the `@qualCast` builtin.
+ /// Uses `pl_node` with payload `Bin`. `lhs` is dest type, `rhs` is operand.
+ qual_cast,
/// Implements the `@truncate` builtin.
/// Uses `pl_node` with payload `Bin`. `lhs` is dest type, `rhs` is operand.
truncate,
@@ -1195,6 +1198,7 @@ pub const Inst = struct {
.float_cast,
.int_cast,
.ptr_cast,
+ .qual_cast,
.truncate,
.align_cast,
.has_field,
@@ -1484,6 +1488,7 @@ pub const Inst = struct {
.float_cast,
.int_cast,
.ptr_cast,
+ .qual_cast,
.truncate,
.align_cast,
.has_field,
@@ -1755,6 +1760,7 @@ pub const Inst = struct {
.float_cast = .pl_node,
.int_cast = .pl_node,
.ptr_cast = .pl_node,
+ .qual_cast = .pl_node,
.truncate = .pl_node,
.align_cast = .pl_node,
.typeof_builtin = .pl_node,
diff --git a/src/print_zir.zig b/src/print_zir.zig
index 8d97000582..c2485a8cb4 100644
--- a/src/print_zir.zig
+++ b/src/print_zir.zig
@@ -332,6 +332,7 @@ const Writer = struct {
.float_cast,
.int_cast,
.ptr_cast,
+ .qual_cast,
.truncate,
.align_cast,
.div_exact,
--
2.44.1
