a6e8d5e554
expression is a discarded-value expression.
Summary:
We used to get this wrong in three ways:
1) During parsing, an expression-statement followed by the }) ending a
statement expression was always treated as producing the value of the
statement expression. That's wrong for ({ if (1) expr; })
2) During template instantiation, various kinds of statement (most
statements not appearing directly in a compound-statement) were not
treated as discarded-value expressions, resulting in missing volatile
loads (etc).
3) In all contexts, an expression-statement with attributes was not
treated as producing the value of the statement expression, eg
({ [[attr]] expr; }).
Also fix incorrect enforcement of OpenMP rule that directives can "only
be placed in the program at a position where ignoring or deleting the
directive would result in a program with correct syntax". In particular,
a label (be it goto, case, or default) should not affect whether
directives are permitted.
Reviewers: aaron.ballman, rjmccall
Subscribers: cfe-commits
Tags: #clang
Differential Revision: https://reviews.llvm.org/D57984
llvm-svn: 354090
137 lines
4.6 KiB
C++
137 lines
4.6 KiB
C++
// RUN: %clang_cc1 -verify -fopenmp -ferror-limit 100 %s
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// RUN: %clang_cc1 -verify -fopenmp-simd -ferror-limit 100 %s
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struct S1 { // expected-note 2 {{declared here}}
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int a;
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};
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template <class T>
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T tmain(T argc) {
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#pragma omp flush
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;
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#pragma omp flush untied // expected-error {{unexpected OpenMP clause 'untied' in directive '#pragma omp flush'}}
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#pragma omp flush unknown // expected-warning {{extra tokens at the end of '#pragma omp flush' are ignored}}
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if (argc)
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#pragma omp flush // expected-error {{'#pragma omp flush' cannot be an immediate substatement}}
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if (argc) {
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#pragma omp flush
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}
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while (argc)
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#pragma omp flush // expected-error {{'#pragma omp flush' cannot be an immediate substatement}}
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while (argc) {
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#pragma omp flush
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}
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do
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#pragma omp flush // expected-error {{'#pragma omp flush' cannot be an immediate substatement}}
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while (argc)
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;
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do {
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#pragma omp flush
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} while (argc);
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switch (argc)
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#pragma omp flush // expected-error {{'#pragma omp flush' cannot be an immediate substatement}}
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switch (argc)
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case 1:
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#pragma omp flush // expected-error {{'#pragma omp flush' cannot be an immediate substatement}}
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switch (argc)
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case 1: {
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#pragma omp flush
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}
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switch (argc) {
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#pragma omp flush
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case 1:
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#pragma omp flush
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break;
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default: {
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#pragma omp flush
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} break;
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}
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for (;;)
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#pragma omp flush // expected-error {{'#pragma omp flush' cannot be an immediate substatement}}
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for (;;) {
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#pragma omp flush
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}
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label:
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#pragma omp flush
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label1 : {
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#pragma omp flush
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}
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#pragma omp flush
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#pragma omp flush( // expected-error {{expected expression}} expected-error {{expected ')'}} expected-note {{to match this '('}}
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#pragma omp flush() // expected-error {{expected expression}}
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#pragma omp flush(argc // expected-error {{expected ')'}} expected-note {{to match this '('}}
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#pragma omp flush(argc, // expected-error {{expected expression}} expected-error {{expected ')'}} expected-note {{to match this '('}}
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#pragma omp flush(argc)
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#pragma omp flush(S1) // expected-error {{'S1' does not refer to a value}}
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#pragma omp flush(argc) flush(argc) // expected-warning {{extra tokens at the end of '#pragma omp flush' are ignored}}
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#pragma omp parallel flush(argc) // expected-warning {{extra tokens at the end of '#pragma omp parallel' are ignored}}
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;
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return T();
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}
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int main(int argc, char **argv) {
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#pragma omp flush
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;
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#pragma omp flush untied // expected-error {{unexpected OpenMP clause 'untied' in directive '#pragma omp flush'}}
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#pragma omp flush unknown // expected-warning {{extra tokens at the end of '#pragma omp flush' are ignored}}
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if (argc)
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#pragma omp flush // expected-error {{'#pragma omp flush' cannot be an immediate substatement}}
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if (argc) {
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#pragma omp flush
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}
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while (argc)
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#pragma omp flush // expected-error {{'#pragma omp flush' cannot be an immediate substatement}}
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while (argc) {
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#pragma omp flush
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}
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do
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#pragma omp flush // expected-error {{'#pragma omp flush' cannot be an immediate substatement}}
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while (argc)
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;
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do {
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#pragma omp flush
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} while (argc);
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switch (argc)
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#pragma omp flush // expected-error {{'#pragma omp flush' cannot be an immediate substatement}}
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switch (argc)
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case 1:
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#pragma omp flush // expected-error {{'#pragma omp flush' cannot be an immediate substatement}}
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switch (argc)
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case 1: {
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#pragma omp flush
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}
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switch (argc) {
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#pragma omp flush
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case 1:
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#pragma omp flush
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break;
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default: {
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#pragma omp flush
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} break;
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}
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for (;;)
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#pragma omp flush // expected-error {{'#pragma omp flush' cannot be an immediate substatement}}
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for (;;) {
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#pragma omp flush
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}
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label:
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#pragma omp flush
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label1 : {
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#pragma omp flush
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}
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#pragma omp flush
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#pragma omp flush( // expected-error {{expected expression}} expected-error {{expected ')'}} expected-note {{to match this '('}}
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#pragma omp flush() // expected-error {{expected expression}}
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#pragma omp flush(argc // expected-error {{expected ')'}} expected-note {{to match this '('}}
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#pragma omp flush(argc, // expected-error {{expected expression}} expected-error {{expected ')'}} expected-note {{to match this '('}}
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#pragma omp flush(argc)
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#pragma omp flush(S1) // expected-error {{'S1' does not refer to a value}}
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#pragma omp flush(argc) flush(argc) // expected-warning {{extra tokens at the end of '#pragma omp flush' are ignored}}
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#pragma omp parallel flush(argc) // expected-warning {{extra tokens at the end of '#pragma omp parallel' are ignored}}
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;
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return tmain(argc);
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}
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