Anna Zaks [Tue, 20 Sep 2016 20:28:50 +0000 (20:28 +0000)]
[analyzer] Add a checker that detects blocks in critical sections
This checker should find the calls to blocking functions (for example: sleep, getc, fgets,read,recv etc.) inside a critical section. When sleep(x) is called while a mutex is held, other threads cannot lock the same mutex. This might take some time, leading to bad performance or even deadlock.
Example:
mutex_t m;
void f() {
sleep(1000); // Error: sleep() while m is locked! [f() is called from foobar() while m is locked]
// do some work
}
Add some entropy to the folder name in Driver/warning-options.cpp.
It was trying to check that things behave correctly when a
non-existant folder was specified for -isysroot. Incidentally,
I have a folder named FOO in the root of my drive, so this test
was failing. Make this impossible by using %T to refer to a
definitely non-existant folder.:
CodeGen: further merge cstring literal construction
Use the new CreateCStringLiteral in an additional site. Now all the C string
literals are created in one function. Furthermore, mark the additional literal
as an `unnamed_addr constant`.
Flesh out the section on interpreting coverage reports, mention the
coverage export feature, and add notes on how to build llvm with
coverage turned on.
[analyzer] Calculate extent size for memory regions allocated by new expression.
ArrayBoundChecker did not detect out of bounds memory access errors in case an
array was allocated by the new expression. This patch resolves this issue.
Remove InstructionCombining and its related pass from sample pgo passes as we can handle "invoke" correctly.
Summary: We previously relies on InstructionCombining pass to remove invoke instructions. Now that we can inline invoke instructions correctly, we do not need these passes any more.
Remove excessive padding from the struct CallStackFrame
The struct CallStackFrame is in lib/AST/ExprConstant.cpp
inside anonymous namespace.
This diff reorders the fields and removes excessive padding.
Test plan: make -j8 check-clang
Martin Probst [Mon, 19 Sep 2016 07:02:34 +0000 (07:02 +0000)]
clang-format: [JS] Fix line breaks before comments when sorting imports.
Summary:
Previously, clang-format would always insert an additional line break after the
import block if the main body started with a comment, due to loosing track of
the first non-import line.
[analyzer] SATestBuild.py: Treat '#' as comment in projectMap.csv
Treat lines in projectMap.csv that start with '#' as comments. This enables a
workflow where projects can be temporarily disabled with a comment describing
when they should be turned back on.
CodeGen: mark ObjC cstring literals as unnamed_addr
These are all emitted into a section with a cstring_literal attribute. The
attribute permits the linker to coalesce the string contents. The address of
the strings are not important.
These strings are constants, mark them as such. This doesn't matter too much in
practice on MachO since the constants are placed into a special section and not
referred to directly.
Eric Liu [Sat, 17 Sep 2016 12:26:42 +0000 (12:26 +0000)]
When replacements have the same offset, make replacements with smaller length order first in the set.
Summary:
No behavioral change intended. The change makes iterating the replacements set more intuitive in Replacements class implementation. Previously, insertion is ordered before an deletion/replacement with the same offset, which is counter-intuitive for implementation, especially for a followup patch to support adding insertions around replacements.
With the current ordering, we only need to make `applyAllReplacements` iterate the replacements set reversely when applying them so that deletion/replacement is still applied before insertion with the same offset.
CodeGen: refactor the ObjC cstring literal creation
This refactors the cstring literal creation as mentioned in the couple of FIXMEs
littered in the various invocations to CreateMetadataVar. This centralises the
definition of the literals, and will enable changing the literal creation to a
single site. NFC.
Richard Smith [Fri, 16 Sep 2016 23:30:39 +0000 (23:30 +0000)]
Fix a couple of wrong-code bugs in switch-on-constant optimization:
* recurse through intermediate LabelStmts and AttributedStmts when checking
whether a statement inside a switch declares a variable
* if the end of a compound statement is reachable from the chosen case label,
and the compound statement contains a variable declaration, it's not valid
to just emit the contents of the compound statement -- we must emit the
statement itself or we lose the scope (and thus end lifetimes at the wrong
point)
Eric Fiselier [Fri, 16 Sep 2016 10:04:38 +0000 (10:04 +0000)]
Touch up [[clang::require_constant_initialization]] docs
* Fix an egregious comma usage.
* Remove the `static` keyword in the example since the variables should have
external linkage.
* Use C++11 attributes in the example.
John McCall [Fri, 16 Sep 2016 02:40:45 +0000 (02:40 +0000)]
Alter the iOS/tvOS ARM64 C++ ABI to ignore the upper half of the
virtual table offset in a member function pointer.
We are reserving this space for future ABI use relating to alternative
v-table configurations. In the meantime, continue to zero-initialize
this space when actually emitting a member pointer literal.
This will successfully interoperate with existing compilers.
Future versions of the compiler may place additional data in
this location, and at that point, code emitted by compilers
prior to this patch will fail if exposed to such a member pointer.
This is therefore a somewhat hard ABI break. However, because
it is limited to an uncommon case of an uncommon language feature,
and especially because interoperation with the standard library
does not depend on member pointers, we believe that with a
sufficiently advance compiler change the impact of this break
will be minimal in practice.
Stephen Hines [Fri, 16 Sep 2016 01:07:04 +0000 (01:07 +0000)]
Do not warn about format strings that are indexed string literals.
Summary:
The warning for a format string not being a string literal and therefore
being potentially insecure is overly strict for indices into string
literals. This fix checks if the index into the string literal is
precomputable. If that's the case it will check if the suffix of that
string literal is a valid format string string literal. It will still
issue the aforementioned warning for out of range indices into the
string literal.
[CodeGen][ObjC] Block captures should inherit the type of the captured
field in the enclosing lambda or block.
This patch fixes a bug in code-gen where it uses the type of the
declared variable rather than the type of the capture of the enclosing
lambda or block for the block capture. For example, in the following
function, code-gen currently uses i32* for the block capture "a" because
"a" is passed to foo1 as a reference, but it should use i32 since the
enclosing lambda captures "a" by value.
void foo1(int &a) {
auto lambda = [a]{
auto block1 = ^{
i = a;
};
block1();
};
lambda();
}
[Sema] Allow shifting a scalar operand by a vector operand.
r278501 inadvertently introduced a bug in which it disallowed shifting
scalar operands by vector operands when not compiling for OpenCL. This
commit fixes it.
David L. Jones [Thu, 15 Sep 2016 22:12:26 +0000 (22:12 +0000)]
Simplify Clang's version number configuration in CMake.
Currently, the Clang version is computed as follows:
1. LLVM defines major, minor, and patch versions, all statically set. Today,
these are 4, 0, and 0, respectively.
2. The static version numbers are combined into PACKAGE_VERSION along with a
suffix, so the result today looks like "4.0.0svn".
3. Clang extracts CLANG_VERSION from PACKAGE_VERSION using a regexp. The regexp
allows the patch level to omitted, and drops any non-digit trailing values.
Today, this result looks like "4.0.0".
4. CLANG_VERSION is then split further into CLANG_VERSION_MAJOR and
CLANG_VERSION_MINOR. Today, these resolve to 4 and 0, respectively.
5. If CLANG_VERSION matches a regexp with three version components, then
CLANG_VERSION_PATCHLEVEL is extracted and the CLANG_HAS_VERSION_PATCHLEVEL
variable is set to 1. Today, these values are 0 and 1, respectively.
6. The CLANG_VERSION_* variables (and CLANG_HAS_VERSION_PATCHLEVEL) are
configured into [llvm/tools/clang/]include/clang/Basic/Version.inc
verbatim by CMake.
7. In [llvm/tools/clang/]include/clang/Basic/Version.h, macros are defined
conditionally, based on CLANG_HAS_VERSION_PATCHLEVEL, to compute
CLANG_VERSION_STRING as either a two- or three-level version number. Today,
this value is "4.0.0", because despite the patchlevel being 0, it was
matched by regexp and is thus "HAS"ed by the preprocessor. This string is
then used wherever Clang's "version" is needed [*].
[*] Including, notably, by compiler-rt, for computing its installation path.
This change collapses steps 2-5 by defaulting Clang to use LLVM's (non-string)
version components for the Clang version (see [*] for why not PACKAGE_VERSION),
and collapses steps 6 and 7 by simply writing CLANG_VERSION_STRING into
Version.inc. The Clang version today always uses the patchlevel form, so the
collapsed Version.inc does not have logic for a version without a patch level.
Historically speaking, this technique began with the VER file in r82085 (which
survives in the form of the regexp in #3). The major, minor, and patchlevel
versions were introduced by r106863 (which remains in #4-6). The VER file itself
was deleted in favor of the LLVM version number in r106914. On the LLVM side,
the individual LLVM_VERSION_MAJOR, LLVM_VERSION_MINOR, and PACKAGE_VERSION
weren't introduced for nearly two more years, until r150405.
Reapply: Silence false positive diagnostics regarding passing an object of enumeration type to va_start().
The underlying type for an enumeration in C is either char, signed int, or unsigned int. In the case the underlying type is chosen to be char (such as when passing -fshort-enums or using __attribute__((packed)) on the enum declaration), the enumeration can result in undefined behavior. However, when the underlying type is signed int or unsigned int (or long long as an extension), there is no undefined behavior because the types are compatible. This patch silences diagnostics for the latter while retaining the diagnostics for the former.
Simon Dardis [Thu, 15 Sep 2016 14:01:55 +0000 (14:01 +0000)]
[mips][ias] Enable IAS by default for N64 on Debian mips64el.
Unfortunately we can't enable it for all N64 because it is not yet possible to
distinguish N32 from N64 from the triple on other environments.
N64 has been confirmed to produce identical (within reason) objects to GAS
during stage 2 of compiler recursion on N64-abi Fedora. Unfortunately,
Fedora's triples do not distinguish N32 from N64 so I can't enable it by
default there. I'm currently repeating this testing for Debian mips64el but
it's very unlikely to produce a different result.
Silence false positive diagnostics regarding passing an object of enumeration type to va_start(). The underlying type for an enumeration in C is either char, signed int, or unsigned int. In the case the underlying type is chosen to be char (such as when passing -fshort-enums or using __attribute__((packed)) on the enum declaration), the enumeration can result in undefined behavior. However, when the underlying type is signed int or unsigned int (or long long as an extension), there is no undefined behavior because the types are compatible. This patch silences diagnostics for the latter while retaining the diagnostics for the former.
Oliver Stannard [Thu, 15 Sep 2016 08:55:41 +0000 (08:55 +0000)]
[ARM] ARM-specific attributes should be accepted for big-endian
The ARM-specific C attributes (currently just interrupt) need to check
for both the big- and little-endian versions of the triples, so that
they are accepted for both big and little endian targets.
TargetWindows and TargetMicrosoftCXXABI also only use the little-endian
triples, but this is correct as windows is not supported on big-endian
ARM targets (and this is asserted in lib/Basic/Targets.cpp).
Stephen Hines [Wed, 14 Sep 2016 20:05:20 +0000 (20:05 +0000)]
Do not warn about format strings that are indexed string literals.
Summary:
The warning for a format string not being a sting literal and therefore
being potentially insecure is overly strict for indecies into sting
literals. This fix checks if the index into the string literal is
precomputable. If thats the case it will check if the suffix of that
sting literal is a valid format string string literal. It will still
issue the aforementioned warning for out of range indecies into the
string literal.
[analyzer] scan-build-py: Remove relative path hack for SATestsBuild.py
Remove the relative path hack in scan-build-py that converts a fully qualified
directory name and a fully qualified file path to a relative path before running
the analyzer on a file.
This hack is not needed: the bad interaction with SATestsBuild.py it was
intended to address is actually the same underlying problem that r280768 fixed.
Further, because the hack would always relativize paths, it caused
SATestBuild.py to be unable to properly line up issues when the build system
changed directory and then built a source file in a child directory but used a
fully-qualified path for the source file.
Move the definition of `getTriple()` into the header. It would just call
`getTarget().getTriple()`. Inline the definition to allow the compiler to see
the same amount of the layout as previously. Remove the more verbose
`getTarget().getTriple()` in favour of `getTriple()`.
Eric Liu [Wed, 14 Sep 2016 13:04:51 +0000 (13:04 +0000)]
Supports adding insertion around non-insertion replacements.
Summary:
Extend `tooling::Replacements::add()` to support adding order-independent replacements.
Two replacements are considered order-independent if one of the following conditions is true:
- They do not overlap. (This is already supported.)
- One replacement is insertion, and the other is a replacement with
length > 0, and the insertion is adjecent to but not contained in the
other replacement. In this case, the replacement should always change
the original code instead of the inserted text.
Eric Liu [Wed, 14 Sep 2016 10:05:10 +0000 (10:05 +0000)]
Revert "[modules] When merging one definition into another, propagate the list of re-exporting modules from the discarded definition to the retained definition."
Richard Smith [Wed, 14 Sep 2016 02:24:50 +0000 (02:24 +0000)]
[docs] Fix formatting of characters so that tables line up properly. Add
padding around table cells so the borders of adjacent tables don't run into
each other (now that they're perfectly aligned).
[sanitizer-coverage] add yet another flavour of coverage instrumentation: trace-pc-guard. The intent is to eventually replace all of {bool coverage, 8bit-counters, trace-pc} with just this one. Clang part
Richard Smith [Wed, 14 Sep 2016 01:05:35 +0000 (01:05 +0000)]
[modules] When merging one definition into another, propagate the list of
re-exporting modules from the discarded definition to the retained definition.
Richard Smith [Tue, 13 Sep 2016 22:51:09 +0000 (22:51 +0000)]
Warning flag updates:
-Wdiv-by-zero may as well be an alias for -Wdivision-by-zero rather than a GCC-compatibility no-op.
-Wno-shadow should disable -Wshadow-ivar.
-Weffc++ may as well enable -Wnon-virtual-dtor like it does in GCC.
CUDA target attributes are used for function overloading and must not be merged.
This fixes a bug where attributes were inherited during function template
specialization in CUDA and made it impossible for specialized function
to provide its own target attributes.
r235815 changed CGRecordLowering::accumulateBases to ignore non-virtual
bases of size 0, which prevented adding those non-virtual bases to
CGRecordLayout's NonVirtualBases. This caused clang to assert when
CGRecordLayout::getNonVirtualBaseLLVMFieldNo was called in
EmitNullConstant. This commit fixes the bug by ignoring zero-sized
non-virtual bases in EmitNullConstant.
Hans Wennborg [Tue, 13 Sep 2016 21:08:20 +0000 (21:08 +0000)]
Try harder to not inline dllimport functions referencing non-dllimport functions
In r246338, code was added to check for this, but it failed to take into
account implicit destructor invocations because those are not reflected
in the AST. This adds a separate check for them.
The class PTHWriter is in lib/Frontend/CacheTokens.cpp
inside the anonymous namespace.
This diff changes the order of fields an removes excessive padding.
Test plan: make -j8 check-clang
[SemaObjC] Be more strict while parsing type arguments and protocols
Fix a crash-on-invalid.
When parsing type arguments and protocols,
parseObjCTypeArgsOrProtocolQualifiers() calls ParseTypeName(), which tries to
find matching tokens for '[', '(', etc whenever they appear among potential
type names. If unmatched, ParseTypeName() yields a tok::eof token stream. This
leads to crashes since the parsing at this point is not expected to go beyond
the param list closing '>'.
Fix that by properly handling tok::eof in
parseObjCTypeArgsOrProtocolQualifiers() callers.
AST may contain intermediate ParenExpr nodes
between MemberExpr and ArrayToPointerDecay.
This diff adjusts the check in ExprEngine::VisitMemberExpr accordingly.
Test plan: make -j8 check-clang-analysis
projects / clang / log