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Detect duplicate member names in struct and struct type literals (#3395)

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A struct with the same member name twice can cause a `CARBON_CHECK`
failure later when it is used (problem found by fuzzing).

---------

Co-authored-by: Richard Smith <richard@metafoo.co.uk>
This commit is contained in:
josh11b
2023-11-15 06:12:03 +00:00
committed by GitHub
co-authored by Richard Smith
parent 7d8afed6f7
commit d21e7b4f14
3 changed files with 116 additions and 4 deletions
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toolchain/check/testdata/struct/fail_duplicate_name.carbon
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// Part of the Carbon Language project, under the Apache License v2.0 with LLVM
// Exceptions. See /LICENSE for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
// AUTOUPDATE
// CHECK:STDERR: fail_duplicate_name.carbon:[[@LINE+6]]:42: ERROR: Duplicated field name `abc` in struct type literal.
// CHECK:STDERR: fn F() -> {.d: i32, .abc: i32, .e: i32, .abc: i32, .f: i32};
// CHECK:STDERR: ^
// CHECK:STDERR: fail_duplicate_name.carbon:[[@LINE+3]]:22: Field with the same name here.
// CHECK:STDERR: fn F() -> {.d: i32, .abc: i32, .e: i32, .abc: i32, .f: i32};
// CHECK:STDERR: ^
fn F() -> {.d: i32, .abc: i32, .e: i32, .abc: i32, .f: i32};
// CHECK:STDERR: fail_duplicate_name.carbon:[[@LINE+6]]:19: ERROR: Duplicated field name `a` in struct type literal.
// CHECK:STDERR: let v: {.a: i32, .a: i32} = {.a = 1};
// CHECK:STDERR: ^
// CHECK:STDERR: fail_duplicate_name.carbon:[[@LINE+3]]:10: Field with the same name here.
// CHECK:STDERR: let v: {.a: i32, .a: i32} = {.a = 1};
// CHECK:STDERR: ^
let v: {.a: i32, .a: i32} = {.a = 1};
// CHECK:STDERR: fail_duplicate_name.carbon:[[@LINE+6]]:26: ERROR: Duplicated field name `def` in struct literal.
// CHECK:STDERR: let w: i32 = {.def = 1, .def = 2}.def;
// CHECK:STDERR: ^
// CHECK:STDERR: fail_duplicate_name.carbon:[[@LINE+3]]:16: Field with the same name here.
// CHECK:STDERR: let w: i32 = {.def = 1, .def = 2}.def;
// CHECK:STDERR: ^
let w: i32 = {.def = 1, .def = 2}.def;
// CHECK:STDERR: fail_duplicate_name.carbon:[[@LINE+6]]:30: ERROR: Duplicated field name `a` in struct literal.
// CHECK:STDERR: var x: {.a: i32} = {.a = 1, .a = 2};
// CHECK:STDERR: ^
// CHECK:STDERR: fail_duplicate_name.carbon:[[@LINE+3]]:22: Field with the same name here.
// CHECK:STDERR: var x: {.a: i32} = {.a = 1, .a = 2};
// CHECK:STDERR: ^
var x: {.a: i32} = {.a = 1, .a = 2};
// CHECK:STDERR: fail_duplicate_name.carbon:[[@LINE+6]]:39: ERROR: Duplicated field name `b` in struct literal.
// CHECK:STDERR: var y: {.b: i32, .c: i32} = {.b = 3, .b = 4};
// CHECK:STDERR: ^
// CHECK:STDERR: fail_duplicate_name.carbon:[[@LINE+3]]:31: Field with the same name here.
// CHECK:STDERR: var y: {.b: i32, .c: i32} = {.b = 3, .b = 4};
// CHECK:STDERR: ^
var y: {.b: i32, .c: i32} = {.b = 3, .b = 4};
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %.loc21: type = struct_type {.a: i32}
// CHECK:STDOUT: %.loc45: type = ptr_type {.b: i32, .c: i32}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file "fail_duplicate_name.carbon" {
// CHECK:STDOUT: %F: <function> = fn_decl @F
// CHECK:STDOUT: %.loc21_35: i32 = int_literal 1
// CHECK:STDOUT: %.loc21_36: {.a: i32} = struct_literal (%.loc21_35)
// CHECK:STDOUT: %v: <error> = bind_name v, <error>
// CHECK:STDOUT: %.loc29_22: i32 = int_literal 1
// CHECK:STDOUT: %.loc29_32: i32 = int_literal 2
// CHECK:STDOUT: %w: i32 = bind_name w, <error>
// CHECK:STDOUT: %.loc37_16: type = struct_type {.a: i32}
// CHECK:STDOUT: %x.var: ref {.a: i32} = var x
// CHECK:STDOUT: %x: ref {.a: i32} = bind_name x, %x.var
// CHECK:STDOUT: %.loc37_26: i32 = int_literal 1
// CHECK:STDOUT: %.loc37_34: i32 = int_literal 2
// CHECK:STDOUT: assign %x.var, <error>
// CHECK:STDOUT: %.loc45_25: type = struct_type {.b: i32, .c: i32}
// CHECK:STDOUT: %y.var: ref {.b: i32, .c: i32} = var y
// CHECK:STDOUT: %y: ref {.b: i32, .c: i32} = bind_name y, %y.var
// CHECK:STDOUT: %.loc45_35: i32 = int_literal 3
// CHECK:STDOUT: %.loc45_43: i32 = int_literal 4
// CHECK:STDOUT: assign %y.var, <error>
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @F() -> <error>;