Merge pull request #11133 from Vexu/stage2

stage2: misc fixes on the way to `std.debug.dumpCurrentStackTrace`

lib/std/debug.zig

@@ -1630,7 +1630,6 @@ fn getSymbolFromDwarf(address: u64, di: *DW.DwarfInfo) !SymbolInfo {
             .symbol_name = nosuspend di.getSymbolName(address) orelse "???",
             .compile_unit_name = compile_unit.die.getAttrString(di, DW.AT.name) catch |err| switch (err) {
                 error.MissingDebugInfo, error.InvalidDebugInfo => "???",
-                else => return err,
             },
             .line_info = nosuspend di.getLineNumberInfo(compile_unit.*, address) catch |err| switch (err) {
                 error.MissingDebugInfo, error.InvalidDebugInfo => null,

lib/std/dwarf.zig

@@ -822,7 +822,7 @@ pub const DwarfInfo = struct {
                     // in the list itself.
                     // If no starting value is specified use zero.
                     var base_address = compile_unit.die.getAttrAddr(AT.low_pc) catch |err| switch (err) {
-                        error.MissingDebugInfo => 0,
+                        error.MissingDebugInfo => @as(u64, 0), // TODO https://github.com/ziglang/zig/issues/11135
                         else => return err,
                     };
 

src/AstGen.zig

@@ -1035,9 +1035,8 @@ fn nosuspendExpr(
         });
     }
     gz.nosuspend_node = node;
-    const result = try expr(gz, scope, rl, body_node);
-    gz.nosuspend_node = 0;
-    return rvalue(gz, rl, result, node);
+    defer gz.nosuspend_node = 0;
+    return expr(gz, scope, rl, body_node);
 }
 
 fn suspendExpr(

src/Sema.zig

@@ -6972,7 +6972,7 @@ fn zirSwitchBlock(sema: *Sema, block: *Block, inst: Zir.Inst.Index) CompileError
                     return sema.failWithOwnedErrorMsg(block, msg);
                 }
 
-                if (special_prong == .@"else") {
+                if (special_prong == .@"else" and seen_errors.count() == operand_ty.errorSetNames().len) {
                     return sema.fail(
                         block,
                         special_prong_src,
@@ -16692,6 +16692,13 @@ fn coerceInMemoryAllowedErrorSets(
             else => unreachable,
         }
 
+        if (dst_ies.func == sema.owner_func) {
+            // We are trying to coerce an error set to the current function's
+            // inferred error set.
+            try dst_ies.addErrorSet(sema.gpa, src_ty);
+            return .ok;
+        }
+
         try sema.resolveInferredErrorSet(block, dest_src, dst_payload.data);
         // isAnyError might have changed from a false negative to a true positive after resolution.
         if (dest_ty.isAnyError()) {
@@ -18910,7 +18917,7 @@ fn resolvePeerTypes(
                         }
 
                         const chosen_set_ty = err_set_ty orelse chosen_ty.errorUnionSet();
-                        const candidate_set_ty = chosen_ty.errorUnionSet();
+                        const candidate_set_ty = candidate_ty.errorUnionSet();
 
                         if (.ok == try sema.coerceInMemoryAllowedErrorSets(block, chosen_set_ty, candidate_set_ty, src, src)) {
                             err_set_ty = chosen_set_ty;

src/codegen/llvm.zig

@@ -5347,7 +5347,14 @@ pub const FuncGen = struct {
         if (self.liveness.isUnused(inst)) return null;
 
         const llvm_i32 = self.context.intType(32);
-        const llvm_fn = self.getIntrinsic("llvm.frameaddress", &.{llvm_i32});
+        const llvm_fn_name = "llvm.frameaddress.p0i8";
+        const llvm_fn = self.dg.object.llvm_module.getNamedFunction(llvm_fn_name) orelse blk: {
+            const llvm_p0i8 = self.context.intType(8).pointerType(0);
+            const param_types = [_]*const llvm.Type{llvm_i32};
+            const fn_type = llvm.functionType(llvm_p0i8, &param_types, param_types.len, .False);
+            break :blk self.dg.object.llvm_module.addFunction(llvm_fn_name, fn_type);
+        };
+
         const params = [_]*const llvm.Value{llvm_i32.constNull()};
         const ptr_val = self.builder.buildCall(llvm_fn, &params, params.len, .Fast, .Auto, "");
         const llvm_usize = try self.dg.llvmType(Type.usize);

test/behavior/error.zig

@@ -626,3 +626,26 @@ test "inferred error set equality" {
     try expect(BarError == BarError);
     try expect(BazError == BazError);
 }
+
+test "peer type resolution of two different error unions" {
+    const a: error{B}!void = {};
+    const b: error{A}!void = {};
+    var cond = true;
+    const err = if (cond) a else b;
+    try err;
+}
+
+test "coerce error set to the current inferred error set" {
+    const S = struct {
+        fn foo() !void {
+            var a = false;
+            if (a) {
+                const b: error{A}!void = error.A;
+                return b;
+            }
+            const b = error.A;
+            return b;
+        }
+    };
+    S.foo() catch {};
+}

test/behavior/switch.zig

@@ -610,14 +610,11 @@ test "switch on pointer type" {
 }
 
 test "switch on error set with single else" {
-    if (builtin.zig_backend != .stage1) return error.SkipZigTest; // TODO
-
     const S = struct {
         fn doTheTest() !void {
             var some: error{Foo} = error.Foo;
             try expect(switch (some) {
-                else => |a| blk: {
-                    a catch {};
+                else => blk: {
                     break :blk true;
                 },
             });