| Commit message (Collapse) | Author | Age | Files | Lines |
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warnings. NFCI.
The static analyzer is warning about potential null dereferences, but in these cases we should be able to use castAs<> directly and if not assert will fire for us.
llvm-svn: 375443
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warnings. NFCI.
The static analyzer is warning about potential null dereferences, but in these cases we should be able to use castAs<> directly and if not assert will fire for us.
llvm-svn: 375440
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Extend -Wparentheses to cover mixing bitwise-and and bitwise-or with the
conditional operator. There's two main cases seen with this:
unsigned bits1 = 0xf0 | cond ? 0x4 : 0x1;
unsigned bits2 = cond1 ? 0xf0 : 0x10 | cond2 ? 0x5 : 0x2;
// Intended order of evaluation:
unsigned bits1 = 0xf0 | (cond ? 0x4 : 0x1);
unsigned bits2 = (cond1 ? 0xf0 : 0x10) | (cond2 ? 0x5 : 0x2);
// Actual order of evaluation:
unsigned bits1 = (0xf0 | cond) ? 0x4 : 0x1;
unsigned bits2 = cond1 ? 0xf0 : ((0x10 | cond2) ? 0x5 : 0x2);
Differential Revision: https://reviews.llvm.org/D66043
llvm-svn: 375326
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Taking a value and the bitwise-or it with a non-zero constant will always
result in a non-zero value. In a boolean context, this is always true.
if (x | 0x4) {} // always true, intended '&'
This patch creates a new warning group -Wtautological-bitwise-compare for this
warning. It also moves in the existing tautological bitwise comparisons into
this group. A few other changes were needed to the CFGBuilder so that all bool
contexts would be checked. The warnings in -Wtautological-bitwise-compare will
be off by default due to using the CFG.
Fixes: https://bugs.llvm.org/show_bug.cgi?id=42666
Differential Revision: https://reviews.llvm.org/D66046
llvm-svn: 375318
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This fixes an assertion failure in the case where an implicit conversion for a
function call involves an lvalue function conversion, and makes the AST for
initializations involving implicit lvalue function conversions more accurate.
Differential Revision: https://reviews.llvm.org/D66437
llvm-svn: 375313
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Summary:
- HIP/CUDA host side needs to use device kernel symbol name to match the
device side binaries. Without a consistent naming between host- and
device-side compilations, it's risky that wrong device binaries are
executed. Consistent naming is usually not an issue until unnamed
types are used, especially the lambda. In this patch, the consistent
name mangling is addressed for the extended lambdas, i.e. the lambdas
annotated with `__device__`.
- In [Itanium C++ ABI][1], the mangling of the lambda is generally
unspecified unless, in certain cases, ODR rule is required to ensure
consisent naming cross TUs. The extended lambda is such a case as its
name may be part of a device kernel function, e.g., the extended
lambda is used as a template argument and etc. Thus, we need to force
ODR for extended lambdas as they are referenced in both device- and
host-side TUs. Furthermore, if a extended lambda is nested in other
(extended or not) lambdas, those lambdas are required to follow ODR
naming as well. This patch revises the current lambda mangle numbering
to force ODR from an extended lambda to all its parent lambdas.
- On the other side, the aforementioned ODR naming should not change
those lambdas' original linkages, i.e., we cannot replace the original
`internal` with `linkonce_odr`; otherwise, we may violate ODR in
general. This patch introduces a new field `HasKnownInternalLinkage`
in lambda data to decouple the current linkage calculation based on
mangling number assigned.
[1]: https://itanium-cxx-abi.github.io/cxx-abi/abi.html
Reviewers: tra, rsmith, yaxunl, martong, shafik
Subscribers: cfe-commits
Tags: #clang
Differential Revision: https://reviews.llvm.org/D68818
llvm-svn: 375309
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This adds support for rewriting <, >, <=, and >= to a normal or reversed
call to operator<=>, for rewriting != to a normal or reversed call to
operator==, and for rewriting <=> and == to reversed forms of those same
operators.
Note that this is a breaking change for various C++17 code patterns,
including some in use in LLVM. The most common patterns (where an
operator== becomes ambiguous with a reversed form of itself) are still
accepted under this patch, as an extension (with a warning). I'm hopeful
that we can get the language rules fixed before C++20 ships, and the
extension warning is aimed primarily at providing data to inform that
decision.
llvm-svn: 375306
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operator that is rewritten as a call to multiple other operators.
No functionality change yet: nothing creates these expressions.
llvm-svn: 375305
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Added trsing/semantics/codegen for combined construct master taskloop simd.
llvm-svn: 375255
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pointer types.
For example, in Objective-C mode, the initialization of 'x' in:
```
@implementation MyType
+ (void)someClassMethod {
MyType *x = self;
}
@end
```
is correctly diagnosed with an incompatible-pointer-types warning, but
in Objective-C++ mode, it is not diagnosed at all -- even though
incompatible pointer conversions generally become an error in C++.
This patch fixes that oversight, allowing implicit conversions
involving Class only to/from unqualified-id, and between qualified and
unqualified Class, where the protocols are compatible.
Note that this does change some behaviors in Objective-C, as well, as
shown by the modified tests.
Of particular note is that assignment from from 'Class<MyProtocol>' to
'id<MyProtocol>' now warns. (Despite appearances, those are not
compatible types. 'Class<MyProtocol>' is not expected to have instance
methods defined by 'MyProtocol', while 'id<MyProtocol>' is.)
Differential Revision: https://reviews.llvm.org/D67983
llvm-svn: 375125
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The static analyzer is warning about potential null dereferences, but in these cases we should be able to use castAs<> directly and if not assert will fire for us.
llvm-svn: 375101
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The static analyzer is warning about potential null dereferences, but in these cases we should be able to use castAs<> directly and if not assert will fire for us.
llvm-svn: 375097
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attributes.
This reverts r375022 (git commit e2692b3bc0327606748b6d291b9009d2c845ced5)
llvm-svn: 375069
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Implement mangling for CSEs to match regular template-ids.
Reviewed as part of D41569 <https://reviews.llvm.org/D41569>.
Re-commit fixing failing test.
llvm-svn: 375063
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The expression of the priority clause must be captured in the combined
task-based directives, like 'parallel master taskloop' directive.
llvm-svn: 375026
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Differential Revision: https://reviews.llvm.org/D68808
llvm-svn: 375022
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This reverts commit 5e34ad109ced8dbdea9500ee28180315b2aeba3d.
The mangling test fails on Windows:
http://lab.llvm.org:8011/builders/clang-x64-ninja-win7/builds/15944
It also fails on ppc64le:
http://lab.llvm.org:8011/builders/clang-ppc64le-linux-lnt/builds/21092
Also revert follow-up 374971 "Fix failing mangle-concept.cpp test."
(it did not help on Win/ppc64le).
llvm-svn: 374985
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Implement mangling for CSEs to match regular template-ids.
Reviewed as part of D41569.
llvm-svn: 374967
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The condition of the final clause must be captured in the combined
task-based directives, like 'parallel master taskloop' directive.
llvm-svn: 374942
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Add code to correctly calculate the associated constraints of a template (no enforcement yet).
D41284 on Phabricator.
llvm-svn: 374938
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Differential Revision: https://reviews.llvm.org/D68806
llvm-svn: 374934
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Part of C++20 Concepts implementation effort. Added Concept Specialization Expressions that are created when a concept is refe$
D41217 on Phabricator.
(recommit after fixing failing Parser test on windows)
llvm-svn: 374903
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This reverts commit ec87b003823d63f3342cf648f55a134c1522e612.
The test fails on Windows, see e.g.
http://lab.llvm.org:8011/builders/clang-x64-windows-msvc/builds/11533/steps/stage%201%20check/logs/stdio
Also revert follow-up r374893.
llvm-svn: 374899
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Part of C++20 Concepts implementation effort. Added Concept Specialization Expressions that are created when a concept is referenced with arguments, and tests thereof.
llvm-svn: 374882
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Summary:
We don't know what context to use until the classification result is
consumed by the parser, which could happen in a different semantic
context. So don't build the expression that results from name
classification until we get to that point and can handle it properly.
This covers everything except C++ implicit class member access, which
is a little awkward to handle properly in the face of the protected
member access check. But it at least fixes all the currently-filed
instances of PR43080.
Reviewers: efriedma
Subscribers: cfe-commits
Tags: #clang
Differential Revision: https://reviews.llvm.org/D68896
llvm-svn: 374826
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The expression of the num_tasks clause must be captured in the combined
task-based directives, like 'parallel master taskloop' directive.
llvm-svn: 374819
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The expression of the grainsize clause must be captured in the combined
task-based directives, like 'parallel master taskloop' directive.
llvm-svn: 374810
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Added parsing/sema/codegen support for 'parallel master taskloop'
constructs. Some of the clauses, like 'grainsize', 'num_tasks', 'final'
and 'priority' are not supported in full, only constant expressions can
be used currently in these clauses.
llvm-svn: 374791
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constructs.
If OpenMP construct includes several capturing regions and the variable
is declared as private, the length of the inner variable length array is
not captured in outer captured regions, only in the innermost region.
Patch fixes this bug.
llvm-svn: 374787
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__is_*_assignable(volatile T&, U).
llvm-svn: 374580
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The behavior from the original patch has changed, since we're no longer
allowing LLVM to just ignore the alignment. Instead, we're just
assuming the maximum possible alignment.
Differential Revision: https://reviews.llvm.org/D68824
llvm-svn: 374562
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parameter type.
We were both failing to decay the array type to a pointer and failing to
remove the top-level cv-qualifications. Fix this by decaying array
parameters even if the parameter type is dependent.
llvm-svn: 374496
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The test fails on Windows, with
error: 'warning' diagnostics expected but not seen:
File builtin-assume-aligned.c Line 62: requested alignment
must be 268435456 bytes or smaller; assumption ignored
error: 'warning' diagnostics seen but not expected:
File builtin-assume-aligned.c Line 62: requested alignment
must be 8192 bytes or smaller; assumption ignored
llvm-svn: 374456
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Code to handle __builtin_assume_aligned was allowing larger values, but
would convert this to unsigned along the way. This patch removes the
EmitAssumeAligned overloads that take unsigned to do away with this
problem.
Additionally, it adds a warning that values greater than 1 <<29 are
ignored by LLVM.
Differential Revision: https://reviews.llvm.org/D68824
llvm-svn: 374450
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Added full support for master taskloop directive.
llvm-svn: 374437
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- Prefer returning mulitple values using a tuple instead of
additional pointers/references.
llvm-svn: 374274
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This reverts r374268 (git commit c34385d07c7d59447bf836b740f032235391d121)
I think I reverted this by mistake, so I'm relanding it. While my bisect
found this revision, I think the crashes I'm seeing locally must be
environmental. Maybe the version of clang I'm using miscompiles tot
clang.
llvm-svn: 374269
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This reverts r374200 (git commit fd18e94697c987d5f24e25aa4e27adaffff3cce4)
Causes crashes just compiling `int main() {}` on my machine.
llvm-svn: 374268
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CUDA/HIP program may be compiled with -fopenmp. In this case, -fopenmp is only passed to host compilation
to take advantages of multi-threads computation.
CUDA/HIP and OpenMP both use Sema::DeviceCallGraph to store functions to be analyzed and remove them
once they decide the function is sure to be emitted. CUDA/HIP and OpenMP have different functions to determine
if a function is sure to be emitted.
To check host/device correctly for CUDA/HIP when -fopenmp is enabled, there needs a unified logic to determine
whether a function is to be emitted. The logic needs to be aware of both CUDA and OpenMP logic.
Differential Revision: https://reviews.llvm.org/D67837
llvm-svn: 374263
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Summary:
- [Itanium C++ ABI][1], for certain contexts like default parameter and
etc., mangling numbering will be local to the particular argument in
which it appears.
- However, for these cases, the mangle numbering context is allocated per
expression evaluation stack entry. That causes, for example, two
lambdas defined/used understand the same default parameter are
numbered as the same value and, in turn, one of them is not generated
at all.
- In this patch, an extra mangle numbering context map is maintained in
the AST context to map taht extra declaration context to its numbering
context. So that, 2 different lambdas defined/used in the same default
parameter are numbered differently.
[1]: https://itanium-cxx-abi.github.io/cxx-abi/abi.html
Reviewers: rsmith, eli.friedman
Subscribers: cfe-commits
Tags: #clang
Differential Revision: https://reviews.llvm.org/D68715
llvm-svn: 374200
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Summary:
Instead of asserting all typos are corrected in the sema destructor.
The sema destructor is not run in the common case of running the compiler
with the -disable-free cc1 flag (which is the default in the driver).
Having this assertion led to crashes in libclang and clangd, which are not
reproducible when running the compiler.
Asserting at the end of the TU could be an option, but finding all
missing typo correction cases is hard and having worse diagnostics instead
of a failing assertion is a better trade-off.
For more discussion on this, see:
https://lists.llvm.org/pipermail/cfe-dev/2019-July/062872.html
Reviewers: sammccall, rsmith
Reviewed By: rsmith
Subscribers: usaxena95, dgoldman, jkorous, vsapsai, rnk, kadircet, cfe-commits
Tags: #clang
Differential Revision: https://reviews.llvm.org/D64799
llvm-svn: 374152
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whose value is not ignored.
We don't warn on all the cases that are deprecated: specifically, we
choose to not warn for now if there are parentheses around the
assignment but its value is not actually used. This seems like a more
defensible rule, particularly for cases like sizeof(v = a), where the
parens are part of the operand rather than the sizeof syntax.
llvm-svn: 374135
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Diagnose some now-deprecated uses of volatile types:
* as function parameter types and return types
* as the type of a structured binding declaration
* as the type of the lvalue operand of an increment / decrement /
compound assignment operator
This does not implement a check for the deprecation of simple
assignments whose results are used; that check requires somewhat
more complexity and will be addressed separately.
llvm-svn: 374133
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and of vendors, not or.
If several vendors are provided in the same vendor context trait, the
context shall match only if all vendors are matching, not one of them.
This is per OpenMP 5.0, 2.3.3 Matching and Scoring Context Selectors,
all selectors in the construct, device, and implementation sets of the
context selector appear in the corresponding trait set of the OpenMP
context.
llvm-svn: 374107
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A bpf specific clang intrinsic is introduced:
u32 __builtin_preserve_field_info(member_access, info_kind)
Depending on info_kind, different information will
be returned to the program. A relocation is also
recorded for this builtin so that bpf loader can
patch the instruction on the target host.
This clang intrinsic is used to get certain information
to facilitate struct/union member relocations.
The offset relocation is extended by 4 bytes to
include relocation kind.
Currently supported relocation kinds are
enum {
FIELD_BYTE_OFFSET = 0,
FIELD_BYTE_SIZE,
FIELD_EXISTENCE,
FIELD_SIGNEDNESS,
FIELD_LSHIFT_U64,
FIELD_RSHIFT_U64,
};
for __builtin_preserve_field_info. The old
access offset relocation is covered by
FIELD_BYTE_OFFSET = 0.
An example:
struct s {
int a;
int b1:9;
int b2:4;
};
enum {
FIELD_BYTE_OFFSET = 0,
FIELD_BYTE_SIZE,
FIELD_EXISTENCE,
FIELD_SIGNEDNESS,
FIELD_LSHIFT_U64,
FIELD_RSHIFT_U64,
};
void bpf_probe_read(void *, unsigned, const void *);
int field_read(struct s *arg) {
unsigned long long ull = 0;
unsigned offset = __builtin_preserve_field_info(arg->b2, FIELD_BYTE_OFFSET);
unsigned size = __builtin_preserve_field_info(arg->b2, FIELD_BYTE_SIZE);
#ifdef USE_PROBE_READ
bpf_probe_read(&ull, size, (const void *)arg + offset);
unsigned lshift = __builtin_preserve_field_info(arg->b2, FIELD_LSHIFT_U64);
#if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
lshift = lshift + (size << 3) - 64;
#endif
#else
switch(size) {
case 1:
ull = *(unsigned char *)((void *)arg + offset); break;
case 2:
ull = *(unsigned short *)((void *)arg + offset); break;
case 4:
ull = *(unsigned int *)((void *)arg + offset); break;
case 8:
ull = *(unsigned long long *)((void *)arg + offset); break;
}
unsigned lshift = __builtin_preserve_field_info(arg->b2, FIELD_LSHIFT_U64);
#endif
ull <<= lshift;
if (__builtin_preserve_field_info(arg->b2, FIELD_SIGNEDNESS))
return (long long)ull >> __builtin_preserve_field_info(arg->b2, FIELD_RSHIFT_U64);
return ull >> __builtin_preserve_field_info(arg->b2, FIELD_RSHIFT_U64);
}
There is a minor overhead for bpf_probe_read() on big endian.
The code and relocation generated for field_read where bpf_probe_read() is
used to access argument data on little endian mode:
r3 = r1
r1 = 0
r1 = 4 <=== relocation (FIELD_BYTE_OFFSET)
r3 += r1
r1 = r10
r1 += -8
r2 = 4 <=== relocation (FIELD_BYTE_SIZE)
call bpf_probe_read
r2 = 51 <=== relocation (FIELD_LSHIFT_U64)
r1 = *(u64 *)(r10 - 8)
r1 <<= r2
r2 = 60 <=== relocation (FIELD_RSHIFT_U64)
r0 = r1
r0 >>= r2
r3 = 1 <=== relocation (FIELD_SIGNEDNESS)
if r3 == 0 goto LBB0_2
r1 s>>= r2
r0 = r1
LBB0_2:
exit
Compare to the above code between relocations FIELD_LSHIFT_U64 and
FIELD_LSHIFT_U64, the code with big endian mode has four more
instructions.
r1 = 41 <=== relocation (FIELD_LSHIFT_U64)
r6 += r1
r6 += -64
r6 <<= 32
r6 >>= 32
r1 = *(u64 *)(r10 - 8)
r1 <<= r6
r2 = 60 <=== relocation (FIELD_RSHIFT_U64)
The code and relocation generated when using direct load.
r2 = 0
r3 = 4
r4 = 4
if r4 s> 3 goto LBB0_3
if r4 == 1 goto LBB0_5
if r4 == 2 goto LBB0_6
goto LBB0_9
LBB0_6: # %sw.bb1
r1 += r3
r2 = *(u16 *)(r1 + 0)
goto LBB0_9
LBB0_3: # %entry
if r4 == 4 goto LBB0_7
if r4 == 8 goto LBB0_8
goto LBB0_9
LBB0_8: # %sw.bb9
r1 += r3
r2 = *(u64 *)(r1 + 0)
goto LBB0_9
LBB0_5: # %sw.bb
r1 += r3
r2 = *(u8 *)(r1 + 0)
goto LBB0_9
LBB0_7: # %sw.bb5
r1 += r3
r2 = *(u32 *)(r1 + 0)
LBB0_9: # %sw.epilog
r1 = 51
r2 <<= r1
r1 = 60
r0 = r2
r0 >>= r1
r3 = 1
if r3 == 0 goto LBB0_11
r2 s>>= r1
r0 = r2
LBB0_11: # %sw.epilog
exit
Considering verifier is able to do limited constant
propogation following branches. The following is the
code actually traversed.
r2 = 0
r3 = 4 <=== relocation
r4 = 4 <=== relocation
if r4 s> 3 goto LBB0_3
LBB0_3: # %entry
if r4 == 4 goto LBB0_7
LBB0_7: # %sw.bb5
r1 += r3
r2 = *(u32 *)(r1 + 0)
LBB0_9: # %sw.epilog
r1 = 51 <=== relocation
r2 <<= r1
r1 = 60 <=== relocation
r0 = r2
r0 >>= r1
r3 = 1
if r3 == 0 goto LBB0_11
r2 s>>= r1
r0 = r2
LBB0_11: # %sw.epilog
exit
For native load case, the load size is calculated to be the
same as the size of load width LLVM otherwise used to load
the value which is then used to extract the bitfield value.
Differential Revision: https://reviews.llvm.org/D67980
llvm-svn: 374099
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C linkage.
After some discussion with OpenMP developers, it was decided that the
functions with the different C linkage can be used in declare variant
directive.
llvm-svn: 374057
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Summary:
Character buffers are sometimes used to represent a pool of memory that
contains non-character objects, due to them being synonymous with a stream of
bytes on almost all modern architectures. Often, when interacting with hardware
devices, byte buffers are therefore used as an intermediary and so we can end
Character buffers are sometimes used to represent a pool of memory that
contains non-character objects, due to them being synonymous with a stream of
bytes on almost all modern architectures. Often, when interacting with hardware
devices, byte buffers are therefore used as an intermediary and so we can end
up generating lots of false-positives.
Moreover, due to the ability of character pointers to alias non-character
pointers, the strict aliasing violations that would generally be implied by the
calculations caught by the warning (if the calculation itself is in fact
correct) do not apply here, and so although the length calculation may be
wrong, that is the only possible issue.
Reviewers: rsmith, xbolva00, thakis
Reviewed By: xbolva00, thakis
Subscribers: thakis, lebedev.ri, cfe-commits
Tags: #clang
Differential Revision: https://reviews.llvm.org/D68526
llvm-svn: 374035
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that the result is always true
llvm-svn: 373973
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According to OpenMP 5.0, range-based for is also considered as a
canonical form of loops.
llvm-svn: 373939
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The static analyzer is warning about potential null dereferences, but in these cases we should be able to use castAs<> directly and if not assert will fire for us.
llvm-svn: 373911
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