Anna Zaks [Fri, 16 Mar 2012 23:24:20 +0000 (23:24 +0000)]
[analyzer] Create symbol-aware stack hints (building upon r152837).
The symbol-aware stack hint combines the checker-provided message
with the information about how the symbol was passed to the callee: as
a parameter or a return value.
For malloc, the generated messages look like this :
"Returning from 'foo'; released memory via 1st parameter"
"Returning from 'foo'; allocated memory via 1st parameter"
"Returning from 'foo'; allocated memory returned"
"Returning from 'foo'; reallocation of 1st parameter failed"
(We are yet to handle cases when the symbol is a field in a struct or
an array element.)
Benjamin Kramer [Fri, 16 Mar 2012 22:31:42 +0000 (22:31 +0000)]
Escape % in diagnostic message when compiling LLVM IR.
% is a common character in IR so we'd crash on almost any malformed IR. The
diagnostic formatter expects a formatting directive when it sees an unescaped %.
Bill Wendling [Fri, 16 Mar 2012 21:45:12 +0000 (21:45 +0000)]
When "low alignment" is specified, then set the alignment of the aggregate's
store to 1. This allows code-gen to select a more appropriate alignment. If left
to zero, an alignment greater than the alignment of the pointer may be selected,
causing code-gen to use instructions which require an alignment greater than the
pointer guarantees.
<rdar://problem/11043589>
David Blaikie [Fri, 16 Mar 2012 20:30:12 +0000 (20:30 +0000)]
Suppress macro expansion of NULL in NULL warnings.
For "int i = NULL;" we would produce:
null.cpp:5:11: warning: implicit conversion of NULL constant to integer [-Wconversion]
int i = NULL;
~ ^~~~
null.cpp:1:14: note: expanded from macro 'NULL'
\#define NULL __null
^~~~~~
But we really shouldn't trace that macro expansion back into the header, yet we
still want macro back traces for code like this:
\#define FOO NULL
int i = FOO;
or
\#define FOO int i = NULL;
FOO
While providing appropriate tagging at different levels of the expansion, etc.
The included test case exercises these cases & does some basic validation (to
ensure we don't have macro expansion notes where we shouldn't, and do where we
should) - but doesn't go as far as to validate the source location/ranges
used in those notes and warnings.
After r150615, which tablegens the group of a diagnostic as an index into the *.inc file, all diagnostic *.inc
files depend on all other diagnostic *.td files, because a diagnostic group can be introduced at any of the diagnostic
*.td files.
Axel Naumann [Fri, 16 Mar 2012 10:40:17 +0000 (10:40 +0000)]
From Vassil Vassilev:
Enable incremental parsing by the Preprocessor,
where more code can be provided after an EOF.
It mainly prevents the tearing down of the topmost lexer.
To be used like this:
PP.enableIncrementalProcessing();
while (getMoreSource()) {
while (Parser.ParseTopLevelDecl(ADecl)) {...}
}
PP.enableIncrementalProcessing(false);
Richard Smith [Fri, 16 Mar 2012 06:12:59 +0000 (06:12 +0000)]
Fix Objective-C compilation-time performance regression introduced in r152608.
Reintroduce lazy name lookup table building, ensuring that the lazy building step
produces the same lookup table that would be built by the eager step.
Avoid building a lookup table for the translation unit outside C++, even in cases
where we can't recover the contents of the table from the declaration chain on
the translation unit, since we're not going to perform qualified lookup into it
anyway. Continue to support lazily building such lookup tables for now, though,
since ASTMerge uses them.
In my tests, this performs very similarly to ToT with r152608 backed out, for C,
Obj-C and C++, and does not suffer from PR10447.
Chad Rosier [Thu, 15 Mar 2012 22:31:42 +0000 (22:31 +0000)]
[frontend] Fix how the frontend handles -fno-inline. AFAIK clang now matches
the behavior of gcc with respect to the -fno-inline and -fno-inline-functions
flags.
Anna Zaks [Thu, 15 Mar 2012 21:13:02 +0000 (21:13 +0000)]
[analyzer] Allow checkers to supply call stack diagnostic hints for the
BugVisitor DiagnosticPieces.
When checkers create a DiagnosticPieceEvent, they can supply an extra
string, which will be concatenated with the call exit message for every
call on the stack between the diagnostic event and the final bug report.
(This is a simple version, which could be/will be further enhanced.)
For example, this is used in Malloc checker to produce the ",
which allocated memory" in the following example:
static char *malloc_wrapper() { // 2. Entered call from 'use'
return malloc(12); // 3. Memory is allocated
}
void use() {
char *v;
v = malloc_wrapper(); // 1. Calling 'malloc_wrappers'
// 4. Returning from 'malloc_wrapper', which allocated memory
} // 5. Memory is never released; potential
memory leak
[libclang] A couple of enhancements to c-index-test.
-When printing location avoid printing the filename if it is
same as the main file, not just if it has '.h' extension.
-Make sure we allocate enough bytes for storing as string a
huge line number.
[Sema] Introduce a data recursive evaluator specific to binary operators.
This allows us to handle extreme cases of chained binary operators without causing stack
overflow.
The binary operators that are handled with the data recursive evaluator are
comma, logical, or operators that have operands with integral or enumeration type.
Bill Wendling [Thu, 15 Mar 2012 09:27:30 +0000 (09:27 +0000)]
Add the object size checking support for a few other builtins.
The functions memccpy, strdup, strndup, strlcat, and strlcpy should also have
object size checking support. Of course, this is only good if the C library also
supports these functions.
<rdar://problem/10528974>
David Blaikie [Thu, 15 Mar 2012 05:09:31 +0000 (05:09 +0000)]
Unpluralize -Wfoo-conversions warnings for consistency.
Err on the side of brevity and rename (while providing aliases for the original
name) -Wbool-conversions, -Wint-conversions, and -Wvector-conversions for
consistency with constant, literal, string, and sign conversion warnings. And
name the diagnostic groups explicitly while I'm here rather than rewriting the
string in the groups and sema td files.
Curiously, vector-conversion is not under -Wconversion. Perhaps it should be.
Richard Smith [Thu, 15 Mar 2012 04:53:45 +0000 (04:53 +0000)]
Unrevert r152761 (reverted in r152772) with a fix for the issue which was
breaking bootstrap. No test yet: it's quite hard to tickle the failure case.
The specific testcase for this wouldn't be useful for testing anything more
general than a reintroduction of this precise bug in any case.
David Blaikie [Thu, 15 Mar 2012 04:50:32 +0000 (04:50 +0000)]
Reapply r152745 (reverted in 152765) now that compiler-rt is fixed.
Original commit message:
Provide -Wnull-conversion separately from -Wconversion.
Like GCC, provide a NULL conversion to non-pointer conversion as a separate
flag, on by default. GCC's flag is "conversion-null" which we provide for
cross compatibility, but in the interests of consistency (with
-Wint-conversion, -Wbool-conversion, etc) the canonical Clang flag is called
-Wnull-conversion.
Patch by Lubos Lunak.
Review feedback by myself, Chandler Carruth, and Chad Rosier.
Richard Smith [Thu, 15 Mar 2012 00:41:48 +0000 (00:41 +0000)]
Minor optimization to constant evaluation: don't bother computing expr source
locations for diagnostics we're not going to emit, and don't track the subobject
designator outside C++11 (since we're not going to use it anyway).
This seems to give about a 0.5% speedup on 403.gcc/combine.c, but the results
were sufficiently noisy that I can't reject the null hypothesis.
Chad Rosier [Wed, 14 Mar 2012 23:32:11 +0000 (23:32 +0000)]
[frontend] Add support for disabling the "inline" keyword using
-fno-inline-functions.
This behaves much like -fno-inline in gcc, but based on a discussion with
Daniel it was decided that -fno-inline-functions should subsume -fno-inline.
Please speak up if you object. The -fno-inline flag remains ignored.
Final part of rdar://10972766
Richard Smith [Wed, 14 Mar 2012 23:13:10 +0000 (23:13 +0000)]
Instantiating a class template should not instantiate the definition of any
scoped enumeration members. Later uses of an enumeration temploid as a nested
name specifier should cause its instantiation. Plus some groundwork for
explicit specialization of member enumerations of class templates.
David Blaikie [Wed, 14 Mar 2012 22:28:22 +0000 (22:28 +0000)]
Provide -Wnull-conversion separately from -Wconversion.
Like GCC, provide a NULL conversion to non-pointer conversion as a separate
flag, on by default. GCC's flag is "conversion-null" which we provide for
cross compatibility, but in the interests of consistency (with
-Wint-conversion, -Wbool-conversion, etc) the canonical Clang flag is called
-Wnull-conversion.
Patch by Lubos Lunak.
Review feedback by myself, Chandler Carruth, and Chad Rosier.
Daniel Dunbar [Wed, 14 Mar 2012 09:49:36 +0000 (09:49 +0000)]
[Basic] Change DiagnosticBuilder to use a separate status variable to track whether the builder is active.
- This may seem superflous, but actually this allows the optimizer to more
easily eliminate the isActive() checks needed by the SemaDiagnosticBuilder
and DiagnosticBuilder dtors. And by more easily, I mean the current LLVM is
actually able to do one and not the other. :)
Daniel Dunbar [Wed, 14 Mar 2012 09:49:32 +0000 (09:49 +0000)]
[Sema] Fix SemaDiagnosticBuilder to be inline.
- As with DiagnosticBuilder, it is very important that SemaDiagnosticBuilder be
completely inline to ensure that the compiler can rip it apart and sink it to
registers.
This is good for another 30k reduction in code size.
David Blaikie [Tue, 13 Mar 2012 23:33:06 +0000 (23:33 +0000)]
Add a test case for PR8385.
"struct{template struct{" would fail an assertion.
This assertion failure seems to have gone away somewhere along the line so
here's a test to make sure we don't regress. We still accept some very weird
explicit template 'instantiations' ("template int;", anyone) but at least we're
not asserting/crashing here.
Daniel Dunbar [Tue, 13 Mar 2012 21:02:14 +0000 (21:02 +0000)]
[Basic] Fix up DiagnosticBuilder::{FlushCounts,Emit} to be inline.
- This is much more important than it appears at first glance...
The intended design of DiagnosticBuilder was that it never escape and that all
its members would get lowered to registers by the compiler. By fixing Emit here,
the compiler can completely eliminate the DiagnosticBuilder object and never
need to push those registers back into it.
Unfortunately, Sema has broken DiagnosticBuilder in other ways (by introducing
SemaDiagnosticBuilder), so we don't get the fill impact of this, but it is still
good for 30k reduction in code size. I'll work on fixing the
SemaDiagnosticBuilder problems next.
projects / clang / log