| Commit message (Collapse) | Author | Age | Files | Lines |
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This big PR adds support for bit fields in structs and unions to
the verified part of CompCert, namely the CompCert C and Clight
languages.
The compilation of bit field accesses to normal integer accesses +
shifts and masks is done and proved correct as part of the Cshmgen
pass.
The layout of bit fields in memory is done by the functions in module
Ctypes. It follows the ELF ABI layout algorithm. As a bonus, basic
soundness properties of the layout are shown, such as "two different
bit fields do not overlap" or "a bit field and a regular field do not
overlap".
All this replaces the previous emulation of bit fields by
source-to-source rewriting in the unverified front-end of CompCert
(module cparse/Bitfield.ml). This emulation was prone to errors (see
nonstandard layout instead.
The core idea for the PR is that expressions in l-value position
denote not just a block, a byte offset and a type, but also a bitfield
designator saying whether all the bits of the type are accessed
(designator Full) or only some of its bits (designator
Bits). Designators of the Bits kind appear when the l-value is a bit
field access; the bit width and bit offset in Bits are computed by the
functions in Ctypes that implement the layout algorithm.
Consequently, both in the semantics of CompCert C and Clight and in
the SimplExpr, SimplLocals and Cshmgen compilation passes, pairs of a
type and a bitfield designator are used in a number of places where a
single type was used before.
The introduction of bit fields has a big impact on static
initialization (module cfrontend/Initializers.v), which had to be
rewritten in large part, along with its soundness proof
(cfrontend/Initializersproof.v).
Both static initialization and run-time manipulation of bit fields are
tested in test/abi using differential testing against GCC and
randomly-generated structs.
This work exposed subtle interactions between bit fields and the
volatile modifier. Currently, the volatile modifier is ignored when
accessing a bit field (and a warning is printed at compile-time), just
like it is ignored when accessing a struct or union as a r-value.
Currently, the natural alignment of bit fields and their storage units
cannot be modified with the aligned attribute. _Alignas on bit fields
is rejected as per C11, and the packed modifier cannot be applied to a
struct containing bit fields.
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The configure script still accepts "macosx" for backward compatibility,
but every other part of CompCert now uses "macos".
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This commit adds support for macOS (and probably iOS) running on
AArch64 / ARM 64-bit / "Apple silicon" processors.
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The list of reserved_registers is never reset between the compilation of
multiple files. Instead of storing them in IRC they are moved in the
CPragmas file and reset in the a new reset function for Cpragmas whic is
called per file.
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This commit adds a back-end for the AArch64 architecture, namely ARMv8
in 64-bit mode.
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Move its definitions to modules C (the type `builtins`) and Env
(the operations that deal with the initial environment).
Reasons for the refactoring:
1- The name "Builtins" will soon be reused for a Coq module
2- `Env.initial()` makes more sense than `Builtins.environment()`.
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This is a manual, partial merge of Github pull request #296 by @Fourchaux.
flocq/, cparser/MenhirLib/ and parts of test/ have not been changed
because these are local copies and the fixes should be performed upstream.
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As suggested in #282, it can be useful to #ifdef code depending on
specific versions of CompCert.
Assuming a version number of the form MM.mm ,
the following macros are predefined:
__COMPCERT_MAJOR__=MM (the major version number)
__COMPCERT_MINOR__=mm (the minor version number)
__COMPCERT_VERSION__=MMmm (two decimal digits for the minor, e.g. 305 for version 3.5)
We also define __COMPCERT_BUILDNR__ if the build number is not empty in file ./VERSION.
Closes: #282
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Since the size of integer registers is not identical to the size of pointers
for the ppc64 and e5500 model the check for register pairs in
ExtendedAsm does not work correctly.
In order to avoid this a new field sizeof_intreg is introduced in the
Machine configuration which describes the size of integer registers.
New configurations for the ppc64 and e5500 model are added
and used.
Bug 24273
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The `-iquote` option was passed to the GNU preprocessor as `-iquore`
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These macros can be defined to indicate that variable length
arrays, the _Complex type, atomics and threads are not supported.
Since the _Complex type is not supported, we also need
to undefine __STDC_IEC_559_COMPLEX__
Bug 23408
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Since the used configuration for passing and returning values
struct values is pretty much static it can be hardwired into the
machine settings.
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* Module Cerrors is now called Diagnostic and can be used in parts of CompCert other than cparser/
* Replaced eprintf error. Instead of having eprintf msg; exit 2 use the functions from the
Diagnostics module.
* Raise on error before calling external tools.
* Added diagnostics to clightgen.
* Fix error handling of AsmToJson.
* Cleanup error handling of Elab and C2C.
*The implementation of location printing (file & line) is simplified and correctly prints valid filenames with invalid lines.
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The initialization of Machine.config, as well as the calls to various initialization functions for the C front-end, are now performed by the new `Frontend.init` function.
This avoids code duplication in driver/Driver.ml and exportclight/Clightgen.ml.
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This time with the correct place for setting the destination files.
Bug 20521
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The variable gnu_toolchain is true if a gnu toolchain is used and
false in all other cases. The variable avoids the explicit test
whether the system string is diab and should be easier to change.
Bug 20521.
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Instead of escaping all newlines etc for the help options use
quoted strings.
Bug 19872
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The function to call the assembler and the linker are now in own
files like the preprocessor.
Bug 19197
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Options only available for gnu systems or arm target arch are no
longer displayed in the help and cannot be selected any longer.
Bug 19197
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Clightgen and CompCert share the code for preprocessing as well as
parsing C files. The code as well as command line switches is moved
in the new module Frontend.
Bug 18768
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