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# 5e9746f5 21-Oct-2016 Richard Smith <[email protected]>

DR583, DR1512: Implement a rewrite to C++'s 'composite pointer type' rules.
This has two significant effects:

1) Direct relational comparisons between null pointer constants (0 and nullopt)
and p

DR583, DR1512: Implement a rewrite to C++'s 'composite pointer type' rules.
This has two significant effects:

1) Direct relational comparisons between null pointer constants (0 and nullopt)
and pointers are now ill-formed. This was always the case for C, and it
appears that C++ only ever permitted by accident. For instance, cases like
nullptr < &a
are now rejected.

2) Comparisons and conditional operators between differently-cv-qualified
pointer types now work, and produce a composite type that both source
pointer types can convert to (when possible). For instance, comparison
between 'int **' and 'const int **' is now valid, and uses an intermediate
type of 'const int *const *'.

Clang previously supported #2 as an extension.

We do not accept the cases in #1 as an extension. I've tested a fair amount of
code to check that this doesn't break it, but if it turns out that someone is
relying on this, we can easily add it back as an extension.

This is a re-commit of r284800.

llvm-svn: 284890

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# 41189656 21-Oct-2016 Renato Golin <[email protected]>

Revert "DR583, DR1512: Implement a rewrite to C++'s 'composite pointer type' rules."

This reverts commit r284800, as it failed all ARM/AArch64 bots.

llvm-svn: 284811
# 0c1c53e3 21-Oct-2016 Richard Smith <[email protected]>

DR583, DR1512: Implement a rewrite to C++'s 'composite pointer type' rules.
This has two significant effects:

1) Direct relational comparisons between null pointer constants (0 and nullopt)
and p

DR583, DR1512: Implement a rewrite to C++'s 'composite pointer type' rules.
This has two significant effects:

1) Direct relational comparisons between null pointer constants (0 and nullopt)
and pointers are now ill-formed. This was always the case for C, and it
appears that C++ only ever permitted by accident. For instance, cases like
nullptr < &a
are now rejected.

2) Comparisons and conditional operators between differently-cv-qualified
pointer types now work, and produce a composite type that both source
pointer types can convert to (when possible). For instance, comparison
between 'int **' and 'const int **' is now valid, and uses an intermediate
type of 'const int *const *'.

Clang previously supported #2 as an extension.

We do not accept the cases in #1 as an extension. I've tested a fair amount of
code to check that this doesn't break it, but if it turns out that someone is
relying on this, we can easily add it back as an extension.

llvm-svn: 284800

show more ...


Revision tags: llvmorg-3.9.0, llvmorg-3.9.0-rc3, llvmorg-3.9.0-rc2, llvmorg-3.9.0-rc1, llvmorg-3.8.1, llvmorg-3.8.1-rc1, llvmorg-3.8.0, llvmorg-3.8.0-rc3, llvmorg-3.8.0-rc2, llvmorg-3.8.0-rc1, llvmorg-3.7.1, llvmorg-3.7.1-rc2, llvmorg-3.7.1-rc1, llvmorg-3.7.0, llvmorg-3.7.0-rc4, llvmorg-3.7.0-rc3, llvmorg-3.7.0-rc2, llvmorg-3.7.0-rc1, llvmorg-3.6.2, llvmorg-3.6.2-rc1, llvmorg-3.6.1, llvmorg-3.6.1-rc1, llvmorg-3.5.2, llvmorg-3.5.2-rc1, llvmorg-3.6.0, llvmorg-3.6.0-rc4, llvmorg-3.6.0-rc3, llvmorg-3.6.0-rc2, llvmorg-3.6.0-rc1, llvmorg-3.5.1, llvmorg-3.5.1-rc2, llvmorg-3.5.1-rc1, llvmorg-3.5.0, llvmorg-3.5.0-rc4, llvmorg-3.5.0-rc3, llvmorg-3.5.0-rc2, llvmorg-3.5.0-rc1, llvmorg-3.4.2, llvmorg-3.4.2-rc1, llvmorg-3.4.1, llvmorg-3.4.1-rc2, llvmorg-3.4.1-rc1
# 3bb8b56a 26-Feb-2014 Richard Trieu <[email protected]>

PR16074, implement warnings to catch pointer to boolean true and pointer to
null comparison when the pointer is known to be non-null.

This catches the array to pointer decay, function to pointer dec

PR16074, implement warnings to catch pointer to boolean true and pointer to
null comparison when the pointer is known to be non-null.

This catches the array to pointer decay, function to pointer decay and
address of variables. This does not catch address of function since this
has been previously used to silence a warning.

Pointer to bool conversion is under -Wbool-conversion.
Pointer to null comparison is under -Wtautological-pointer-compare, a sub-group
of -Wtautological-compare.

void foo() {
int arr[5];
int x;
// warn on these conditionals
if (foo);
if (arr);
if (&x);
if (foo == null);
if (arr == null);
if (&x == null);

if (&foo); // no warning
}

llvm-svn: 202216

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Revision tags: llvmorg-3.4.0, llvmorg-3.4.0-rc3, llvmorg-3.4.0-rc2, llvmorg-3.4.0-rc1, llvmorg-3.3.1-rc1, llvmorg-3.3.0, llvmorg-3.3.0-rc3, llvmorg-3.3.0-rc2, llvmorg-3.3.0-rc1, llvmorg-3.2.0, llvmorg-3.2.0-rc3, llvmorg-3.2.0-rc2, llvmorg-3.2.0-rc1, llvmorg-3.1.0, llvmorg-3.1.0-rc3, llvmorg-3.1.0-rc2, llvmorg-3.1.0-rc1, llvmorg-3.0.0, llvmorg-3.0.0-rc4, llvmorg-3.0.0-rc3, llvmorg-3.0.0-rc2, llvmorg-3.0.0-rc1
# 9ca5c425 13-Oct-2011 Richard Smith <[email protected]>

Update all tests other than Driver/std.cpp to use -std=c++11 rather than
-std=c++0x. Patch by Ahmed Charles!

llvm-svn: 141900
# e1db1cf0 19-Jun-2011 Chandler Carruth <[email protected]>

Add test cases for false positives on -Wnull-arithmetic from Richard
Trieu, and fix them by checking for array and function types as well as
pointer types.

I've added a predicate method on Type to b

Add test cases for false positives on -Wnull-arithmetic from Richard
Trieu, and fix them by checking for array and function types as well as
pointer types.

I've added a predicate method on Type to bundle together the logic we're
using here: isPointerLikeType(). I'd welcome better names for this
predicate, this is the best I came up with. It's implemented as a switch
to be a touch lighter weight than all the chained isa<...> casts that
would result otherwise.

llvm-svn: 133383

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# 701fb36b 16-Jun-2011 Richard Trieu <[email protected]>

Add a new warning when a NULL constant is used in arithmetic operations. The warning will fire on cases such as:

int x = 1 + NULL;

llvm-svn: 133196