authorgravatar for kubkon@jakubkonka.comJakub Konka <kubkon@jakubkonka.com> 2022-04-13 16:24:56+02:00
committergravatar for kubkon@jakubkonka.comJakub Konka <kubkon@jakubkonka.com> 2022-04-13 16:24:56+02:00
log3f912430bdddede8c3f6a9555b76499aa2dabb7e
tree8c405e643a8cfa44d4f0d5838a570576dd106caa
parent0bf72833307bf500ebec1a08641600f12cda0434

stage2,x64: deref memory if referenced via GOT for local vars

1 files changed, 13 insertions(+), 3 deletions(-)

src/arch/x86_64/CodeGen.zig+13-3
......@@ -3911,8 +3911,8 @@ fn airDbgVar(self: *Self, inst: Air.Inst.Index) !void {
39113911
39123912 const tag = self.air.instructions.items(.tag)[inst];
39133913 switch (tag) {
3914 .dbg_var_ptr => try self.genVarDbgInfo(ty.childType(), mcv, name),
3915 .dbg_var_val => try self.genVarDbgInfo(ty, mcv, name),
3914 .dbg_var_ptr => try self.genVarDbgInfo(tag, ty.childType(), mcv, name),
3915 .dbg_var_val => try self.genVarDbgInfo(tag, ty, mcv, name),
39163916 else => unreachable,
39173917 }
39183918
......@@ -3921,6 +3921,7 @@ fn airDbgVar(self: *Self, inst: Air.Inst.Index) !void {
39213921
39223922fn genVarDbgInfo(
39233923 self: *Self,
3924 tag: Air.Inst.Tag,
39243925 ty: Type,
39253926 mcv: MCValue,
39263927 name: [:0]const u8,
......@@ -3952,9 +3953,14 @@ fn genVarDbgInfo(
39523953 .memory => |addr| {
39533954 const endian = self.target.cpu.arch.endian();
39543955 const ptr_width = @intCast(u8, @divExact(self.target.cpu.arch.ptrBitWidth(), 8));
3956 const is_ptr = switch (tag) {
3957 .dbg_var_ptr => true,
3958 .dbg_var_val => false,
3959 else => unreachable,
3960 };
39553961 try dbg_info.ensureUnusedCapacity(2 + ptr_width);
39563962 dbg_info.appendSliceAssumeCapacity(&[2]u8{ // DW.AT.location, DW.FORM.exprloc
3957 1 + ptr_width,
3963 1 + ptr_width + @boolToInt(is_ptr),
39583964 DW.OP.addr, // literal address
39593965 });
39603966 switch (ptr_width) {
......@@ -3966,6 +3972,10 @@ fn genVarDbgInfo(
39663972 },
39673973 else => unreachable,
39683974 }
3975 if (is_ptr) {
3976 // We need deref the address as we point to the value via GOT entry.
3977 try dbg_info.append(DW.OP.deref);
3978 }
39693979 },
39703980 else => {
39713981 log.debug("TODO generate debug info for {}", .{mcv});