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| author | Neil Booth <neil@duron.akihabara.co.uk> | 2004-07-04 12:57:50 +0000 |
|---|---|---|
| committer | Neil Booth <neil@gcc.gnu.org> | 2004-07-04 12:57:50 +0000 |
| commit | a09d4744294e28a19e7f785e85a361d2cd34c25e (patch) | |
| tree | 7aa5c20469e6c104827c6efe34863e1cdbc76042 /libcpp/expr.c | |
| parent | b25c17bcf0525adb212c2f08fa2607a0543630a8 (diff) | |
| download | gcc-a09d4744294e28a19e7f785e85a361d2cd34c25e.zip gcc-a09d4744294e28a19e7f785e85a361d2cd34c25e.tar.gz gcc-a09d4744294e28a19e7f785e85a361d2cd34c25e.tar.bz2 | |
re PR preprocessor/16192 (Bug in expression evaluation when operand is missing)
* doc/cpp.texi: Don't document what we do for ill-formed expressions.
* doc/cppopts.texi: Clarify processing of command-line defines.
libcpp:
PR preprocessor/16192
PR preprocessor/15913
PR preprocessor/15572
* expr.c (_cpp_parse_expr): Handle remaining cases where an
expression is missing.
* init.c (post_options): Traditional cpp doesn't do // comments.
testsuite:
* gcc.dg/cpp/if-mop.c: Two new testcases.
* gcc.dg/cpp/trad/comment-3.c: New.
From-SVN: r84080
Diffstat (limited to 'libcpp/expr.c')
| -rw-r--r-- | libcpp/expr.c | 28 |
1 files changed, 16 insertions, 12 deletions
diff --git a/libcpp/expr.c b/libcpp/expr.c index f49bd08..4768918 100644 --- a/libcpp/expr.c +++ b/libcpp/expr.c @@ -747,18 +747,22 @@ _cpp_parse_expr (cpp_reader *pfile) } else if (want_value) { - /* Ordering here is subtle and intended to favor the - missing parenthesis diagnostics over alternatives. */ - if (op.op == CPP_CLOSE_PAREN) - { - if (top->op == CPP_OPEN_PAREN) - SYNTAX_ERROR ("void expression between '(' and ')'"); - } - else if (top->op == CPP_EOF) - SYNTAX_ERROR ("#if with no expression"); - if (top->op != CPP_EOF && top->op != CPP_OPEN_PAREN) - SYNTAX_ERROR2 ("operator '%s' has no right operand", - cpp_token_as_text (pfile, top->token)); + /* We want a number (or expression) and haven't got one. + Try to emit a specific diagnostic. */ + if (op.op == CPP_CLOSE_PAREN && top->op == CPP_OPEN_PAREN) + SYNTAX_ERROR ("missing expression between '(' and ')'"); + + if (op.op == CPP_EOF && top->op == CPP_EOF) + SYNTAX_ERROR ("#if with no expression"); + + if (top->op != CPP_EOF && top->op != CPP_OPEN_PAREN) + SYNTAX_ERROR2 ("operator '%s' has no right operand", + cpp_token_as_text (pfile, top->token)); + else if (op.op == CPP_CLOSE_PAREN || op.op == CPP_EOF) + /* Complain about missing paren during reduction. */; + else + SYNTAX_ERROR2 ("operator '%s' has no left operand", + cpp_token_as_text (pfile, op.token)); } top = reduce (pfile, top, op.op); |