Logan Chien [Thu, 8 Jan 2015 13:19:07 +0000 (13:19 +0000)]
Frontend: Fix SourceColumnMap assertion failure on non-ascii characters.
If there are some non-ascii character in the input source code, the
column index might be smallar than the byte index. This will result
in two possible assertion failures. This CL fixes the computation of
the column index and byte index.
1. The assertion in startOfNextColumn() and startOfPreviousColumn()
should not be raised when the byte index is greater than the column
index since the non-ascii characters may use more than one bytes to
store a character in a column.
2. The length of the caret line should be equal to the number of columns
of source line, instead of the length of the source line. Otherwise,
the assertion in selectInterestingSourceRegion will be raised because
the removed columns plus the kept columns are not greater than the max
column, which means that we should not remove any column at all.
Nico Weber [Wed, 7 Jan 2015 22:40:55 +0000 (22:40 +0000)]
Add help text for mmacosx-version-min=, mios-version-min=.
I keep forgetting the exact spelling of -macosx-version-min=, and now I can
run `bin/clang --help | grep version -A 2` to remind myself. While here,
also document -mios-version-min=. Don't document -mios-simulator-version-min=
as it's just an alias for -mios-version-min= these days.
Kaelyn Takata [Wed, 7 Jan 2015 21:16:39 +0000 (21:16 +0000)]
Handle OpaqueValueExprs more intelligently in the TransformTypos tree
transform.
Also diagnose typos in the initializer of an invalid C++ declaration.
Both issues were hit using the same line of test code, depending on
whether the code was treated as C or C++.
Nico Weber [Wed, 7 Jan 2015 18:47:51 +0000 (18:47 +0000)]
Slightly simplify the test from r225361.
Shorter and doesn't need -O2 -- but still suboptimal as it's still doing
-emit-obj. dblaikie says he'll improve this when he'll reland his change
with a fix.
Nico Weber [Wed, 7 Jan 2015 18:41:10 +0000 (18:41 +0000)]
clang-format: Let Chromium use the Google default for AlignTrailingComments.
r225141 changed the defaults of AllowShortIfStatementsOnASingleLine and
AlignTrailingComments for Google style and added explicit overrides for
Chromium style to undo these changes. For AllowShortIfStatementsOnASingleLine
that's good as the Android style guide (which Chromium uses for Java) explicitly
permits single-line ifs. But it's silent on trailing comments, to it makes
sense for Chromium style to just follow Google style.
Nico Weber [Wed, 7 Jan 2015 18:23:08 +0000 (18:23 +0000)]
Revert r225085, it caused PR22096.
PR22096 has several test cases that assert that look fairly different. I'm
adding one of those as an automated test, but when relanding the other cases
should probably be checked as well.
Add additional constraint checking for target specific behaviour for inline
assembly constraints. We would previously silently let all arguments through
for these constraints. In cases where the constraints were violated, we could
end up failing to select instructions and triggering assertions or worse,
silently ignoring instructions.
Allow -fsanitize-coverage=N with ubsan, clang part
Summary:
Allow -fsanitize-coverage=N with ubsan, clang part.
This simply allows the flag combination.
The LLVM will work out of the box, the compile-rt part
will follow as a separate patch.
Samuel Antao [Mon, 5 Jan 2015 17:07:42 +0000 (17:07 +0000)]
Fix clash of gcc toolchains in driver regression tests.
For some regression tests the path to the right toolchain is specified using the -sysroot switch. However, if clang was configured with a custom gcc toolchain (either by using GCC_INSTALL_PREFIX in cmake or the equivalent configure command), the path to the custom gcc toolchain path takes precedence to the one specified by sysroot. This causes several regression tests to fail as they will be using an unexpected path. This patch fixes this issue by adding --gcc-toolchain='' to all tests that rely on that. The empty string causes the driver to pick the path from sysroot instead.
Summary:
Replace usage of StringRef with std::string in AST_MATCHER* generated
matchers to make sure they keep their own copy of the string.
The value could be a temporary and it causes the pointer to be dangling
by the time the matcher is executed.
Nico Weber [Sun, 4 Jan 2015 20:32:12 +0000 (20:32 +0000)]
Remove an assert that's not true on invalid code.
r185773 added an assert that checked that a CXXUnresolvedConstructExpr either
has a valid rparen, or exactly one argument. This doesn't have to be true for
invalid inputs. Convert the assert to an if, and add a test for this case.
Nico Weber [Sun, 4 Jan 2015 05:29:21 +0000 (05:29 +0000)]
Document that GetTypeForDeclarator() cannot return a null type.
Also add a few asserts for this. The existing code assumes this in a bunch
of places already (see e.g. the assert at the top of ParseTypedefDecl(), and
there are many unchecked calls on the result of GetTypeForDeclarator()), and
from looking through the code this should always be true from what I can tell.
This allows removing ASTContext::getNullTypeSourceInfo() too as that's now
unused.
Nico Weber [Sun, 4 Jan 2015 04:53:10 +0000 (04:53 +0000)]
Crash less enthusiasticially on _Atomic or __restrict__ on invalid types.
Many places in Sema cannot handle isNull() types. This is fine, because in
most places the type building code recovers by falling back to IntTy. In
GetFullTypeForDeclarator(), this is done at the end of the getNumTypeObjects()
loop body. This function calls BuildQualifiedType() before this fallback is
done though, so it explicitly needs to check for isNull() types.
Aaron Ballman [Sat, 3 Jan 2015 17:00:12 +0000 (17:00 +0000)]
Volatile reads are side-effecting operations, but in the general case of access through a volatile-qualified type, we're not certain of the underlying object's side-effects on access.
Treat volatile accesses as "maybe" instead of "definite" side effects for the purposes of warning on evaluations in an unevaluated context. No longer diagnose on idiomatic code like:
Driver: honour the clang-cl behaviour on ARM as well
Unfortunately, MSVC does not indicate to the driver what target is being used.
This means that we cannot correctly select the target architecture for the
clang_rt component. This breaks down when targeting windows with the clang
driver as opposed to the clang-cl driver. This should fix the native ARM
buildbot tests.
Driver: reuse getCompilerRT in place of addSanitizerRTWindows
The logic for addSanitizerRTWindows was performing the same logical operation as
getCompilerRT, which was previously fully generalised for Linux and Windows.
This avoids having a duplication of the logic for building up the name of a
clang_rt component. This change does move the current limitation for Windows
into getArchNameForCompilerRTLib, where it is assumed that the architecture for
Windows is always i386.
David Blaikie [Fri, 2 Jan 2015 19:49:28 +0000 (19:49 +0000)]
Temporarily XFAIL fallout from r225083 while investigating.
Between this behavior and that fixed by r225083/r225000, I'll take the
latter over the former for now, but I'm immediately working on
understanding/addressing this behavior too.
(the fact that the code change in r225083 caused this change in behavior
is a bit troubling anyway - given that it looks & claims to be just a
preformance thing)
David Blaikie [Fri, 2 Jan 2015 19:49:10 +0000 (19:49 +0000)]
DebugInfo: Remove some now-unnecessary location handling around function arguments.
r225000 generalized debug info line info handling for expressions such
that this code is no longer necessary.
This removes the last use of CGDebugInfo::getLocation, but not all the
uses of CGDebugInfo::CurLoc, which is still used internally in
CGDebugInfo. I'd like to do away with all of that & might succeed after
a few more patches.
David Blaikie [Fri, 2 Jan 2015 19:06:25 +0000 (19:06 +0000)]
DebugInfo: Fix cases where location failed to be updated after r225000
The optimization (that appears to have been here since the earliest
implementation (r50848) & has become more complicated over the years) to
avoid recreating the debugloc if it would be the same was out of date
because ApplyDebugLocation was not re-updating the CurLoc/PrevLoc. This
optimization doesn't look terribly beneficial/necessary, so I'm removing
it - if it turns up in benchmarks, I'm happy to reconsider/reimplement
this with justification, but for now it just seems to add
complexity/problems.
Nick Lewycky [Fri, 2 Jan 2015 01:33:12 +0000 (01:33 +0000)]
Instantiation of a CXXMethodDecl may fail when the parameter type cannot be instantiated. Do not crash in this case. Fixes PR22040!
The FIXME in the test is caused by TemplateDeclInstantiator::VisitCXXRecordDecl
returning a nullptr instead of creating an invalid decl. This is a common
pattern across all of TemplateDeclInstantiator, so I'm not comfortable changing
it. The reason it's not invalid in the class template is due to support for an
MSVC extension, see r137573.
David Majnemer [Thu, 1 Jan 2015 09:49:44 +0000 (09:49 +0000)]
CodeGen: Don't crash when a lambda uses a local constexpr variable
The DeclRefExpr might be for a variable initialized by a constant
expression which hasn't been ODR used.
Emit the initializer for the variable instead of trying to capture the
variable itself.
Unify the handling for all the various components, into a single path to link
against the various components in a number of places. This reduces duplication
of the clang_rt library name construction logic.
David Blaikie [Tue, 30 Dec 2014 19:39:33 +0000 (19:39 +0000)]
Reapply "DebugInfo: Generalize debug info location handling"
Originally committed in r224385 and reverted in r224441 due to concerns
this change might've introduced a crash. Turns out this change fixes the
crash introduced by one of my earlier more specific location handling
changes (those specific fixes are reverted by this patch, in favor of
the more general solution).
Recommitted in r224941 and reverted in r224970 after it caused a crash
when building compiler-rt. Looks to be due to this change zeroing out
the debug location when emitting default arguments (which were meant to
inherit their outer expression's location) thus creating call
instructions without locations - these create problems for inlining and
must not be created. That is fixed and tested in this version of the
change.
Original commit message:
This is a more scalable (fixed in mostly one place, rather than many
places that will need constant improvement/maintenance) solution to
several commits I've made recently to increase source fidelity for
subexpressions.
This resetting had to be done at the DebugLoc level (not the
SourceLocation level) to preserve scoping information (if the resetting
was done with CGDebugInfo::EmitLocation, it would've caused the tail end
of an expression's codegen to end up in a potentially different scope
than the start, even though it was at the same source location). The
drawback to this is that it might leave CGDebugInfo out of sync. Ideally
CGDebugInfo shouldn't have a duplicate sense of the current
SourceLocation, but for now it seems it does... - I don't think I'm
going to tackle removing that just now.
I expect this'll probably cause some more buildbot fallout & I'll
investigate that as it comes up.
Also these sort of improvements might be starting to show a weakness/bug
in LLVM's line table handling: we don't correctly emit is_stmt for
statements, we just put it on every line table entry. This means one
statement split over multiple lines appears as multiple 'statements' and
two statements on one line (without column info) are treated as one
statement.
I don't think we have any IR representation of statements that would
help us distinguish these cases and identify the beginning of each
statement - so that might be something we need to add (possibly to the
lexical scope chain - a scope for each statement). This does cause some
problems for GDB and possibly other DWARF consumers.
Driver: use the canonical library prefix on Windows
Unlike Unices, Windows does not use a library prefix. Use the traditional
naming scheme even for Windows itanium environments. This makes the builtins
behave more like the sanitisers as well.
Keno Fischer [Tue, 30 Dec 2014 08:12:39 +0000 (08:12 +0000)]
Add a public accessor for GlobalCtors in CodeGenModule
Summary:
In a JIT context it is useful to be able to access the GlobalCtors
and especially clear them once they have been emitted and called.
This adds a public method to be able to access the list.
Nico Weber [Tue, 30 Dec 2014 02:06:40 +0000 (02:06 +0000)]
Don't crash on an invalid trailing return type on a function before a '...'
clang tries to produce a helpful diagnostic for the traiilng '...', but the
code that r216778 added for this doesn't expect an invalid trailing return type.
Add code to explicitly handle this.
Having explicit code for this but not for other things looks a bit strange, but
trailing return types are special in that they have a separate existence bit in
addition to the type (see r158348).
Nico Weber [Mon, 29 Dec 2014 21:56:22 +0000 (21:56 +0000)]
Crash even less on malformed attributes in an incorrect location.
This is a follow-up to r224915. This adds a bit more line noise to the tests
added in that revision to make sure the parser is ready for a toplevel decl
after each incorrect line. Use this to move the tests up to where they belong.
This uncovered that the early return was missing a call to
ActOnTagDefinitionError(), so add that. (Also fixes at least one of the crashes
on SLi's bot.)
Alexey Samsonov [Mon, 29 Dec 2014 21:28:15 +0000 (21:28 +0000)]
Fix use-after-destruction introduced in r224924.
getMainExecutable() returns a std::string, assigning its result
to StringRef immediately creates a dangling pointer. This was
detected by half-broken fast-MSan-bootstrap bot.
David Blaikie [Mon, 29 Dec 2014 18:18:45 +0000 (18:18 +0000)]
Reapply "DebugInfo: Generalize debug info location handling"
Originally committed in r224385 and reverted in r224441 due to concerns
this change might've introduced a crash. Turns out this change fixes the
crash introduced by one of my earlier more specific location handling
changes (those specific fixes are reverted by this patch, in favor of
the more general solution).
Original commit message:
This is a more scalable (fixed in mostly one place, rather than many
places that will need constant improvement/maintenance) solution to
several commits I've made recently to increase source fidelity for
subexpressions.
This resetting had to be done at the DebugLoc level (not the
SourceLocation level) to preserve scoping information (if the resetting
was done with CGDebugInfo::EmitLocation, it would've caused the tail end
of an expression's codegen to end up in a potentially different scope
than the start, even though it was at the same source location). The
drawback to this is that it might leave CGDebugInfo out of sync. Ideally
CGDebugInfo shouldn't have a duplicate sense of the current
SourceLocation, but for now it seems it does... - I don't think I'm
going to tackle removing that just now.
I expect this'll probably cause some more buildbot fallout & I'll
investigate that as it comes up.
Also these sort of improvements might be starting to show a weakness/bug
in LLVM's line table handling: we don't correctly emit is_stmt for
statements, we just put it on every line table entry. This means one
statement split over multiple lines appears as multiple 'statements' and
two statements on one line (without column info) are treated as one
statement.
I don't think we have any IR representation of statements that would
help us distinguish these cases and identify the beginning of each
statement - so that might be something we need to add (possibly to the
lexical scope chain - a scope for each statement). This does cause some
problems for GDB and possibly other DWARF consumers.
Chandler Carruth [Mon, 29 Dec 2014 13:29:38 +0000 (13:29 +0000)]
Effectively revert r151058 which caused Clang's unwind.h to defer to
libunwind in all cases when installed.
At the time, Clang's unwind.h didn't provide huge chunks of the
LSB-specified unwind interface, and was generally too aenemic to use for
real software. However, it has since then become a strict superset of
the APIs provided by libunwind on Linux. Notably, you cannot compile
llgo's libgo library against libunwind, but you can against Clang's
unwind.h. So let's just use our header. =] I've checked pretty
thoroughly for any incompatibilities, and I am not aware of any.
An open question is whether or not we should continue to munge
GNU_SOURCE here. I didn't touch that as it potentially has compatibility
implications on systems I cannot easily test -- Darwin. If a Darwin
maintainer can verify that this is in fact unnecessary and remove it,
cool. Until then, leaving it in makes this change a no-op there, and
only really relevant on Linux systems where it is pretty clearly the
right way to go.
Chandler Carruth [Mon, 29 Dec 2014 13:29:36 +0000 (13:29 +0000)]
Add a missing declaration to our unwind.h implementation. This is
necessary to be fully compatible with existing software that calls into
the linux unwind code. You can find documentation of this API and why it
exists in the discussion abot NPTL here:
https://gcc.gnu.org/ml/gcc-patches/2003-09/msg00154.html
Chandler Carruth [Mon, 29 Dec 2014 12:09:08 +0000 (12:09 +0000)]
[multilib] Teach Clang's code about multilib by threading
a CLANG_LIBDIR_SUFFIX down from the build system and using that as part
of the default resource dir computation.
Without this, essentially nothing that uses the clang driver works when
building clang with a libdir suffix. This is probably the single biggest
missing piece of support for multilib as without this people could hack
clang to end up installed in the correct location, but it would then
fail to find its own basic resources. I know of at least one distro that
has some variation on this patch to hack around this; hopefully they'll
be able to use the libdir suffix functionality directly as the rest of
these bits land.
This required fixing a copy of the code to compute Clang's resource
directory that is buried inside of the frontend (!!!). It had bitrotted
significantly relative to the driver code. I've made it essentially
a clone of the driver code in order to keep tests (which use cc1
heavily) passing. This copy should probably just be removed and the
frontend taught to always rely on an explicit resource directory from
the driver, but that is a much more invasive change for another day.
I've also updated one test which actually encoded the resource directory
in its checked output to tolerate multilib suffixes.
Note that this relies on a prior LLVM commit to add a stub to the
autoconf build system for this variable.
Chandler Carruth [Mon, 29 Dec 2014 12:09:03 +0000 (12:09 +0000)]
[cmake] Teach the Clang CMake build to use LLVM_LIBDIR_SUFFIX for its
'lib' directories in the build. This variable is available now both as
part of the normal LLVM build an as part of a standalone build as I've
added it to the LLVMConfig.cmake output.
With this change we should at least put libraries into the multilib
directory correctly. It is the first step in getting Clang to be
reasonably multilib aware.
David Majnemer [Mon, 29 Dec 2014 10:29:53 +0000 (10:29 +0000)]
Sema: Permit array l-values in asm output operands
GCC permits array l-values in asm output operands even though they
aren't modifiable l-values. We used to permit it but this behavior
regressed in r224916.
Nico Weber [Mon, 29 Dec 2014 06:56:50 +0000 (06:56 +0000)]
Don't crash on malformed attributes in an incorrect location.
r168626 added nicer diagnostics for attributes in the wrong places, such as
after the `final` on a class. To do this, it added code that did high-level
pattern matching for e.g. 'final' 'alignas' '(' and then skipped until the
closing ')'. If it saw that, it then went down the regular class parsing
path and then called MaybeParseCXX11Attributes() to parse the attribute after
the 'final' using real attribute parsing code. On invalid attributes, the
real attribute parsing code could eat more tokens than the pattern matching
code and for example skip past the '{' starting the class, which would then
lead to an assert. To prevent this, check for a good state after calling
MaybeParseCXX11Attributes() (which morphed into CheckMisplacedCXX11Attribute()
in r175575) and bail out if things look bleak.
Craig Topper [Mon, 29 Dec 2014 06:41:12 +0000 (06:41 +0000)]
[x86] Put 'C' after 'i' on all the AVX-512 intrisics that take const ints. 'C' is a suffix modifier not a prefix modififier. Also put 'C' on the pointers in all of the gather instrinsics. I think they previously had one due to the misordering. I'm still thinking the 'iC' actually need to be a 'Ii' since they really require an ICE.
David Majnemer [Mon, 29 Dec 2014 05:17:46 +0000 (05:17 +0000)]
Sema: Don't crash when solitary :: token appears before { in struct def
hasDeclaratorForAnonDecl, getDeclaratorForAnonDecl and
getTypedefNameForAnonDecl are expected to handle the case where
NamedDeclOrQualifier holds the wrong type or nothing at all.
David Majnemer [Mon, 29 Dec 2014 02:14:26 +0000 (02:14 +0000)]
SemaCXX: Don't crash when annotation tokens show up before the tag name
Clang has a hack to accept definitions of structs with tag names which
have the same name as intrinsics. However, this hack didn't guard
against annotation tokens showing up in the token stream.
David Majnemer [Sun, 28 Dec 2014 23:46:59 +0000 (23:46 +0000)]
CodeGen: Optimize emssion of zeroinitialzied arrays
Create an ConstantAggregateZero upfront if we see that it is viable.
This saves us from having to manually push_back each and every
initializer and then looping back over them to determine if they are
'null'.
Nico Weber [Sun, 28 Dec 2014 23:24:02 +0000 (23:24 +0000)]
Don't crash on surprising tokens in default parameter template lists.
Fixes this snippet from SLi's afl fuzzer output:
class {
i (x = <, enum
This parsed i as a function, x as a paramter, and the stuff after < as a
template list. This then called TryConsumeDeclarationSpecifier() which
called TryAnnotateCXXScopeToken() without checking the preconditions of
this function. Check them before calling, like all other callers of
TryAnnotateCXXScopeToken() do.
A more readable reproducer that causes the same crash is
class {
void i(int x = MyTemplateClass<int, union int>::foo());
};
The reduced version used an eof token as surprising token, but kw_int works
just as well to repro and is easier to insert into a test file.
David Majnemer [Sun, 28 Dec 2014 22:28:32 +0000 (22:28 +0000)]
Parse: Don't crash when 'typename' shows up in an attribute
isDeclarationSpecifier performs error recovers which jostles the token
stream. Specifically, TryAnnotateTypeOrScopeToken will end up consuming
a typename token which will confuse the attribute parsing machinery as
we no-longer have something identifier-like.
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