aboutsummaryrefslogtreecommitdiffstats
path: root/cfrontend
Commit message (Collapse)AuthorAgeFilesLines
* Merge remote-tracking branch 'absint/master' into merge_absintDavid Monniaux2022-03-011-13/+16
|\
| * Check for arguments of struct/union type passed to a vararg functionXavier Leroy2022-02-111-13/+16
| | | | | | | | | | | | | | If any are found, make sure that `-fstruct-passing` was given. Previously, we used to check the fixed arguments (as part of a call to `checkFunctionType`) but not the variable arguments.
* | Merge remote-tracking branch 'absint/master' into towards_3.10David Monniaux2021-12-013-8/+2
|\| | | | | | | Mostly changes in PTree
| * An improved PTree data structure (#420)Xavier Leroy2021-11-163-8/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | This PR replaces the "PTree" data structure used in lib/Maps.v by the canonical binary tries data structure proposed by A. W. Appel and described in the paper "Efficient Extensional Binary Tries", https://arxiv.org/abs/2110.05063 The new implementation is more memory-efficient and a bit faster, resulting in reduced compilation times (-5% on typical C programs, up to -10% on very large C functions). It also enjoys the extensionality property (two tries mapping equal keys to equal data are equal), which simplifies some proofs.
* | Merge remote-tracking branch 'origin/master' into towards_3.10David Monniaux2021-10-294-7/+7
|\|
| * Qualify `Instance` and `Program Instance` as `Global`Xavier Leroy2021-10-034-7/+7
| | | | | | | | This avoids a new warning of Coq 8.14.
* | Merge branch 'master' of https://github.com/AbsInt/CompCert into towards_3.10David Monniaux2021-10-041-3/+3
|\|
| * Adapt to coq/coq#13837 ("apply with" does not rename arguments) (#417)Gaëtan Gilbert2021-10-031-3/+3
| | | | | | | | The change is backward compatible with Coq 8.9 to 8.13 (at least).
* | Merge branch 'master' of https://github.com/AbsInt/CompCert into towards_3.10David Monniaux2021-09-2419-1623/+3381
|\|
| * Avoid `Global Set Asymmetric Patterns` (#408)Xavier Leroy2021-09-151-0/+2
| | | | | | | | | | | | Instead, add `Set Asymmetric Patterns` to the files that need it, or use `Arguments` to make inductive types work better with symmetric patterns. Closes: #403
| * Merge branch 'bitfields' (#400)Xavier Leroy2021-08-2219-1604/+3295
| |\
| | * Native support for bit fields (#400)Xavier Leroy2021-08-2219-1604/+3243
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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.
| | * Add Ctypes.link_match_program_genXavier Leroy2021-08-221-0/+52
| | | | | | | | | | | | | | | A more general version of the link_match_program linking theorem. It supports match_fundef relations parameterized by the source compilation unit.
| * | Revise the declaration of __compcert_* helper functionsXavier Leroy2021-06-301-82/+79
| |/ | | | | | | | | | | Don't put them in the C environment used for elaboration. Instead, add them directly to the generated CompCert C at the end of the C2C translation.
| * Use the LGPL instead of the GPL for dual-licensed filesXavier Leroy2021-05-0812-48/+60
| | | | | | | | | | | | The GPL makes sense for whole applications, but the dual-licensed Coq and OCaml files are more like libraries to be combined with other code, so the LGPL is more appropriate.
| * Support __builtin_expectXavier Leroy2021-05-021-0/+5
| | | | | | | | | | | | | | Not yet used for optimizations. Actually, __builtin_expect is removed during C2C conversion, otherwise the conversion to type "long" produces inefficient code on 64-bit platforms.
| * Support __builtin_unreachableXavier Leroy2021-05-021-0/+3
| | | | | | | | Not yet used for optimizations.
* | Commenting out __builtin_expect from AbsIntCyril SIX2021-06-011-2/+2
| |
* | [BROKEN] Merge with v3.9 : something broken for __builtin_expect in ↵Cyril SIX2021-06-0112-48/+68
| | | | | | | | cfrontend/C2C.ml
* | Merge branch 'master' into merge_master_8.13.1Sylvain Boulmé2021-03-2315-251/+286
|\| | | | | | | | | | | | | | | | | PARTIAL MERGE (PARTLY BROKEN). See unsolved conflicts in: aarch64/TO_MERGE and riscV/TO_MERGE WARNING: interface of va_args and assembly sections have changed
| * Section handling: finer control of variable initializationXavier Leroy2021-02-231-1/+6
| | | | | | | | | | | | | | | | | | | | | | | | | | Distinguish between: - uninitialized variables, which can go in COMM if supported - variables initialized with fixed, numeric quantities, which can go in a readonly section if "const" - variables initialized with symbol addresses which may need relocation, which cannot go in a readonly section even if "const", but can go in a special "const_data" section. Also: on macOS, use ".const" instead of ".literal8" for literals, as not all literals have size 8.
| * Qualify `Hint` as `Global Hint` where appropriateXavier Leroy2021-01-211-4/+4
| | | | | | | | | | | | | | This avoids a new warning of Coq 8.13. Eventually these `Global Hint` should become `#[export] Hint`, with a cleaner but different meaning than `Global Hint`.
| * Support re-normalization of function parameters at function entryXavier Leroy2021-01-162-17/+36
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This is complementary to 28f235806 Some ABIs leave more flexibility concerning function parameters than CompCert expects. For instance, the AArch64/ELF ABI allow the caller of a function to leave unspecified the "padding bits" of function parameters. As an example, a parameter of type "unsigned char" may not have zeros in bits 8 to 63, but may have any bits there. When the caller is compiled by CompCert, it normalizes argument values to the parameter types before the call, so padding bits are always correct w.r.t. the type of the argument. This is no longer guaranteed in interoperability scenarios, when the caller is not compiled by CompCert. This commit adds a general mechanism to insert "re-normalization" conversions on the parameters of a function, at function entry. This is controlled by the platform-dependent function Convention1.return_value_needs_normalization. The semantic preservation proof is still conducted against the CompCert model, where the argument values of functions are already normalized. What the proof shows is that the extra conversions have no effect in this case. In future work we could relax the CompCert model, allowing functions to pass arguments that are not normalized.
| * Replace `omega` tactic with `lia`Xavier Leroy2020-12-2912-219/+222
| | | | | | | | | | | | | | | | | | | | | | Since Coq 8.12, `omega` is flagged as deprecated and scheduled for removal. Also replace CompCert's homemade tactics `omegaContradiction`, `xomega`, and `xomegaContradiction` with `lia` and `extlia`. Turn back on the deprecation warning for uses of `omega`. Make the proof of `Ctypes.sizeof_pos` more robust to variations in `lia`.
| * Changed cc_varargs to an option typeBernhard Schommer2020-12-254-10/+18
| | | | | | | | | | | | Instead of being a simple boolean we now use an option type to record the number of fixed (non-vararg) arguments. Hence, `None` means not vararg, and `Some n` means `n` fixed arguments followed with varargs.
* | Merge branch 'master' (Absint 3.8) into kvx-work-merge3.8David Monniaux2020-11-186-162/+214
|\|
| * Add -main option to specify entrypoint function in interpreter mode (#374)Xavier Leroy2020-10-301-1/+1
| | | | | | | | | | | | | | When running unit tests with the CompCert reference interpreter, it's nice to be able to start execution at a given test function instead of having to write a main function. This PR adds a -main command-line option to give the name of the entry point function. The default is still main. Frama-C has a similar option. The function specified with -main is called with no arguments. If its return type is int, its return value is the exit status of the program. Otherwise, its return value is ignored and the program exits with status 0.
| * Add __builtin_sqrt as synonymous for __builtin_fsqrtXavier Leroy2020-07-271-0/+2
| | | | | | | | __builtin_sqrt (no "f") is the name used by GCC and Clang.
| * Move declarations of __builtin_clz* and __builtin_ctz* to C2C.mlXavier Leroy2020-07-271-0/+12
| | | | | | | | These functions are now available on all targets.
| * Add support for __builtin_fabsfXavier Leroy2020-07-271-0/+2
| |
| * Move shared code in new file.Bernhard Schommer2020-06-281-1/+1
| | | | | | | | | | The name_of_register and register_of_name function are shared between all architectures and can be moved in a common file.
| * Remove the `can_reserve_register` function.Bernhard Schommer2020-06-281-1/+1
| | | | | | | | | | The function is in fact just a call to the function`is_callee_save_register` from `Conventions1.v`.
| * Improve printing of builtin function invocationsXavier Leroy2020-06-251-0/+3
| | | | | | | | In particular __builtin_sel.
| * SimplExpr: remove unused definition "sd_cast_set"Xavier Leroy2020-06-151-2/+0
| | | | | | | | Follow-up to commit 070babef.
| * SimplExpr: better translation of casts in a "for effects" contextXavier Leroy2020-06-153-136/+166
| | | | | | | | | | | | | | | | This is useful for statements such as `(void) expr;` where we would prefer not to explicitly compute intermediate values of type `void` and store them in Clight temporary variables. See issue #361 for a real-world occurrence of this phenomenon.
| * Move reserved_registers to CPragmas.Bernhard Schommer2020-04-201-1/+6
| | | | | | | | | | | | | | 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.
* | Merge remote-tracking branch 'origin/mppa-profiling' into mppa-featuresDavid Monniaux2020-04-121-0/+9
|\ \
| * | begin installing profilingDavid Monniaux2020-04-081-1/+1
| | |
| * | added EF_profilingDavid Monniaux2020-04-081-0/+9
| | |
* | | Merge remote-tracking branch 'origin/mppa-expect3' into mppa-workDavid Monniaux2020-04-099-45/+86
|\ \ \
| * | | expect operationDavid Monniaux2020-04-072-27/+35
| | | |
| * | | Oexpect in frontendDavid Monniaux2020-04-076-16/+47
| | | |
| * | | start implementing expect as exprDavid Monniaux2020-04-071-0/+1
| | | |
| * | | Merge remote-tracking branch 'origin/mppa-work' into mppa-expectDavid Monniaux2020-04-0611-124/+328
| |\| |
| * | | __builtin_expect defined as its first argumentDavid Monniaux2019-09-251-2/+3
| | | |
* | | | Merge remote-tracking branch 'origin/mppa-work' into mppa-threadDavid Monniaux2020-04-082-31/+46
|\ \ \ \ | | |/ / | |/| |
| * | | Merge remote-tracking branch 'origin/master' into attempt-fix-mppa-workCyril SIX2020-04-011-2/+2
| |\ \ \ | | | |/ | | |/|
| | * | Explicit error messages for ill-formed section attributes (#232)Bernhard Schommer2020-03-291-2/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Introduce an error message for section attributes with non string arguments,and another for multiple, ambiguous section attributes. This is more consistent with the handling of other attributes, like packed, than the old behavior of silently ignoring them.
| * | | fixed CSE2 for mppa_k1cDavid Monniaux2020-03-031-29/+44
| |\| | | | | | | | | | | | | | Merge branch 'dm-cse2-naive' of https://github.com/monniaux/CompCert into mppa-cse2
| | * | Define the semantics of `free(NULL)` (#226)Xavier Leroy2020-03-021-29/+44
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | According to ISO C, `free(NULL)` is correct and does nothing. This commit updates accordingly the formal semantics of the `free` external function and the reference interpreter. Closes: #334
generated by cgit (git 2.34.1) at 2024-05-09 19:32:03 +0000