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# d79f3f63 01-Aug-2017 Yan Wang <[email protected]>

[clang] Change the condition of unnecessary packed warning

Summary:
Change the condition of this unnecessary packed warning. The packed is unnecessary when
1. the alignment of the struct/class won't

[clang] Change the condition of unnecessary packed warning

Summary:
Change the condition of this unnecessary packed warning. The packed is unnecessary when
1. the alignment of the struct/class won't alter.
2. the size is unchanged.
3. the offset of each field is the same.

Remove all field-level warning.

Reviewers: chh, akyrtzi, rtrieu

Reviewed By: chh

Subscribers: rsmith, srhines, cfe-commits, xazax.hun

Differential Revision: https://reviews.llvm.org/D34114

llvm-svn: 309750

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Revision tags: llvmorg-5.0.0-rc1, llvmorg-4.0.1, llvmorg-4.0.1-rc3, llvmorg-4.0.1-rc2, llvmorg-4.0.1-rc1, llvmorg-4.0.0, llvmorg-4.0.0-rc4, llvmorg-4.0.0-rc3, llvmorg-4.0.0-rc2, llvmorg-4.0.0-rc1, llvmorg-3.9.1, llvmorg-3.9.1-rc3, llvmorg-3.9.1-rc2, llvmorg-3.9.1-rc1, 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
# d209967a 23-Sep-2015 Richard Smith <[email protected]>

Remove warning on over-wide bit-field of boolean type; there's no risk that
someone thought all the bits would be value bits in this case.

Also fix the wording of the warning -- it claimed that the

Remove warning on over-wide bit-field of boolean type; there's no risk that
someone thought all the bits would be value bits in this case.

Also fix the wording of the warning -- it claimed that the width of 'bool' is
8, which is not correct; the width is 1 bit, whereas the size is 8 bits in our
implementation.

llvm-svn: 248435

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# 022bdc7d 14-Sep-2015 Rachel Craik <[email protected]>

C11 _Bool bitfield diagnostic

Summary: Implement DR262 (for C). This patch will mainly affect bitfields of type _Bool

Reviewers: fraggamuffin, rsmith

Subscribers: hubert.reinterpretcast, cfe-commi

C11 _Bool bitfield diagnostic

Summary: Implement DR262 (for C). This patch will mainly affect bitfields of type _Bool

Reviewers: fraggamuffin, rsmith

Subscribers: hubert.reinterpretcast, cfe-commits

Differential Revision: http://reviews.llvm.org/D10018

llvm-svn: 247618

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Revision tags: 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, 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, llvmorg-2.9.0, llvmorg-2.9.0-rc3, llvmorg-2.9.0-rc2, llvmorg-2.9.0-rc1, llvmorg-2.8.0, llvmorg-2.8.0-rc3
# 3446898e 23-Sep-2010 Argyrios Kyrtzidis <[email protected]>

Use -emit-llvm-only in the test.

llvm-svn: 114636


# ca0d0cd3 22-Sep-2010 Argyrios Kyrtzidis <[email protected]>

Implement -Wpadded and -Wpacked.

-Wpadded warns when undesired padding is introduced in a struct. (rdar://7469556)
-Wpacked warns if a struct is given the packed attribute, but the packed attribute

Implement -Wpadded and -Wpacked.

-Wpadded warns when undesired padding is introduced in a struct. (rdar://7469556)
-Wpacked warns if a struct is given the packed attribute, but the packed attribute has no effect
on the layout or the size of the struct. Such structs may be mis-aligned for little benefit.

The warnings are emitted at the point where layout is calculated, that is at RecordLayoutBuilder.
To avoid calculating the layouts of all structs regardless of whether they are needed or not,
I let the layouts be lazily constructed when needed. This has the disadvantage that the above warnings
will be emitted only when they are used for IR gen, and not e.g with -fsyntax-only:

$ cat t.c
struct S {
char c;
int i;
};
void f(struct S* s) {}

$ clang -fsyntax-only -Wpadded t.c
$ clang -c -Wpadded t.c -o t.o
t.c:3:7: warning: padding struct 'struct S' with 3 bytes to align 'i' [-Wpadded]
int i;
^
1 warning generated.

This is a good tradeoff between providing the warnings and not calculating layouts for all
structs in case the user has enabled a couple of rarely used warnings.

llvm-svn: 114544

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