mirror of
https://github.com/carbon-language/carbon-lang.git
synced 2026-09-24 22:02:23 +01:00
Nicholas Bishop
0075d530b9
This makes it possible to do const eval when calling a constexpr C++ function with params and return types other than 32/64-bit integers. Most of the new logic is in `MaybeModifyCppThunkCallForConstEval`, which is called by `MakeConstantForCall`. This checks if the callee is a C++ thunk (using a new `SpecialFunctionKind::CppThunk` variant), and if so it: * Changes the callee from the C++ thunk to the thunk's callee * Remaps parameters that are passed by pointer to the thunk to the underlying value * Drops the return value parameter, if present
134 lines
3.0 KiB
Plaintext
134 lines
3.0 KiB
Plaintext
// Part of the Carbon Language project, under the Apache License v2.0 with LLVM
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// Exceptions. See /LICENSE for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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// INCLUDE-FILE: toolchain/testing/testdata/min_prelude/full.carbon
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//
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// AUTOUPDATE
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// TIP: To test this file alone, run:
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// TIP: bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/check/testdata/interop/cpp/constexpr.carbon
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// TIP: To dump output, run:
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// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/interop/cpp/constexpr.carbon
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// --- bool.carbon
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library "[[@TEST_NAME]]";
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import Cpp inline '''
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constexpr bool b = true;
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''';
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class C(B:! bool) {}
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fn F() -> C(Cpp.b);
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let x: C(true) = F();
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// --- int.carbon
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library "[[@TEST_NAME]]";
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import Cpp inline '''
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constexpr int i = 123;
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''';
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class C(I:! i32) {}
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fn F() -> C(Cpp.i);
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let x: C(123) = F();
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// --- float.carbon
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library "[[@TEST_NAME]]";
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import Cpp inline '''
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constexpr float flt = 123.5;
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''';
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class C(V:! f32) {}
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fn F() -> C(Cpp.flt);
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let x: C(123.5) = F();
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// --- pointer.carbon
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library "[[@TEST_NAME]]";
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import Cpp inline '''
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int i = 123;
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constexpr int* _Nonnull ptr = &i;
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''';
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class C(V:! i32*) {}
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fn F() -> C(Cpp.ptr);
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let x: C(&Cpp.i) = F();
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// --- function.carbon
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library "[[@TEST_NAME]]";
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import Cpp inline '''
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constexpr int f(int a, int b) { return a + b; }
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''';
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let a: array(i32, Cpp.f(1, 2)) = (1, 2, 3);
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// --- function_bool_param.carbon
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library "[[@TEST_NAME]]";
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import Cpp inline '''
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constexpr int f(bool b) {
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return b ? 3 : 0;
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}
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''';
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let a: array(i32, Cpp.f(true)) = (1, 2, 3);
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// --- function_float_param.carbon
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library "[[@TEST_NAME]]";
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import Cpp inline '''
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constexpr int f(float b) {
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return static_cast<int>(b);
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}
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''';
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let a: array(i32, Cpp.f(3.0)) = (1, 2, 3);
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// --- function_return_bool.carbon
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library "[[@TEST_NAME]]";
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import Cpp inline '''
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constexpr bool f() {
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return true;
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}
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''';
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musteval fn F(b: bool) -> i32 {
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return if b then 3 else 0;
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}
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let a: array(i32, F(Cpp.f())) = (1, 2, 3);
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// --- fail_invalid_constant_eval.carbon
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library "[[@TEST_NAME]]";
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import Cpp inline '''
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constexpr int arr[1] = {0};
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constexpr int f(int a) {
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return arr[a];
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}
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''';
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// CHECK:STDERR: fail_invalid_constant_eval.carbon:[[@LINE+10]]:26: error: call to immediate function 'f' is not a constant expression [CppInteropParseError]
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// CHECK:STDERR: 21 | let a: array(i32, Cpp.f(5)) = (1, 2, 3);
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// CHECK:STDERR: | ^
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// CHECK:STDERR: fail_invalid_constant_eval.carbon:[[@LINE-7]]:10: note: cannot refer to element 5 of array of 1 element in a constant expression [CppInteropParseNote]
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// CHECK:STDERR: 7 | return arr[a];
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// CHECK:STDERR: | ^
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// CHECK:STDERR: fail_invalid_constant_eval.carbon:[[@LINE+4]]:26: note: in call to 'f(5)' [CppInteropParseNote]
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// CHECK:STDERR: 21 | let a: array(i32, Cpp.f(5)) = (1, 2, 3);
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// CHECK:STDERR: | ^
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// CHECK:STDERR:
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let a: array(i32, Cpp.f(5)) = (1, 2, 3);
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