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* | If-conversion optimizationXavier Leroy2019-06-063-1/+156
|/ | | | | | | | | | | | | | | | | | | | Extends the instruction selection pass with an if-conversion optimization: some if/then/else statements are converted into "select" operations, which in turn can be compiled down to branchless instruction sequences if the target architecture supports them. The statements that are converted are of the form if (cond) { x = a1; } else { x = a2; } if (cond) { x = a1; } if (cond) { /*skip*/; } else { x = a2; } where a1, a2 are "safe" expressions, containing no operations that can fail at run-time, such as memory loads or integer divisions. A heuristic in backend/Selectionaux.ml controls when the optimization occurs, depending on command-line flags and the complexity of the "then" and "else" branches.
* Revised attachment of name attributes to structs, unions, enumsXavier Leroy2019-02-252-0/+8
| | | | | | | | | | | | | | | | | | Consider: ``` struct s { ... } __attribute((aligned(N))); struct t { ... } __attribute((aligned(N))) struct t x; ``` In the first case, the aligned attribute should be attached to struct s, so that further references to struct s are aligned. In the second case, the aligned attribute should be attached to the variable x, because if we attach it to struct t, it will be ignored and cause a warning. This commit changes the attachment rule so that it treats both cases right. Extend regression test for "aligned" attribute accordingly, by testing aligned attribute applied to a name of struct type.
* Add regression test for "aligned" attributeXavier Leroy2019-02-253-1/+120
| | | | Expected results were obtained with GCC 5.4 and Clang 8.0
* Test for NULL in variable argument listsXavier Leroy2019-02-042-1/+53
| | | | | Sometimes a vararg function receives a NULL-terminated list of pointers. This can fail if sizeof(NULL) < sizeof(void *), as this test illustrates.
* Attach _Alignas to names and refactor _Alignas checks (#133)Bernhard Schommer2018-09-102-6/+4
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | * Refactor common code of alignas. Instead of working on attributes the function now works directly on the type since the check always performed an extraction of attributes from a type. Bug 23393 * Attach _Alignas to the name. Bug 23393 * Attach "aligned" attributes to names So that __attribute((aligned(N))) remains consistent with _Alignas(N). gcc and clang apply "aligned" attributes to names, with a special case for typedefs: typedef __attribute((aligned(16))) int int_al_16; int_al_16 * p; __attribute((aligned(16))) int * q; For gcc, p is naturally-aligned pointer to 16-aligned int and q is 16-aligned pointer to naturally-aligned int. For CompCert with this commit, both p and q are 16-aligned pointers to naturally-aligned int. * Resurrect the alignment test involving typedef The test was removed because it involved an _Alignas in a typedef, which is no longer supported. However the same effect can be achieved with an "aligned" attribute, which is still supported in typedef.
* Improve execution of regression testsXavier Leroy2018-08-244-16/+45
| | | | | | - Make it possible to skip tests on some platforms - Make it possible to expect a failure (typically: of the reference interpreter) - Stop on error
* Harden the extasm.c test, continuedXavier Leroy2018-08-202-5/+5
| | | | | Follow-up to b9a6a50. clang is not happy with COMPCERT_MODEL=32sse2 ("bad suffix on integer"), so use MODEL_32sse2 and ARCH_x86 instead.
* Harden the extasm.c testXavier Leroy2018-08-202-2/+7
| | | | | | | Pass more info from CompCert's configuration as #define on command line. Use this info to improve the "64 bit" detection in extasm.c. (Before it fails with powerpc-ppc64, which has 64-bit int regs but couldn't be detected with #ifdefs.)
* Issue with packed structs and sizeof, alignof, offsetof in cparser/Xavier Leroy2018-08-173-6/+60
| | | | | | | | | | | | | | | | | | | | | | | | | | | CompCert has two implementations of sizeof, alignof and offsetof (byte offset of a struct field): - the reference implementation, in Coq, from cfrontend/Ctypes.v - the implementation used during elaboration, in OCaml, from cparser/Cutil.ml The reference Coq implementation is used as much as possible, but sometimes during elaboration the size of a type must be computed (e.g. to compute array sizes), or the offset of a field (e.g. to evaluate __builtin_offsetof), in which case the OCaml implementation is used. This causes issues with packed structs. Currently, the cparser/Cutil.ml functions ignore the "packed" attribute on structs. Their results disagree with the "true" sizes, alignments and offsets computed by the cfrontend/Ctypes.v functions after source-to-source transformation of packed structs as done in cparser/PackedStruct.ml. For example: ``` struct __packed__(1) s { char c; short s; int i; }; assert (__builtin_offsetof(struct s, i) == 3); assert (sizeof(struct s) = sizeof(char[sizeof(struct s)])); ``` The two assertions fail. In the first assertion, __builtin_offsetof is elaborated to 4, because the packed attribute is ignored during elaboration. In the second assertion, the type `char[sizeof(struct s)]` is elaborated to `char[8]`, again because the packed attribute is ignored during elaboration, while the other `sizeof(struct s)` is computed as 7 after the source-to-source transformation of packed structs. This commit changes the cparser/Cutil.ml functions so that they take the packed attribute into account when computing sizeof, alignof, offsetof, and struct_layout. Related changes: * cparser/Cutil: add `packing_parameters` function to extract packing info from attributes * cparser/Cutil: refactor and share more code between sizeof_struct, offsetof, and struct_layout * cparser/Elab: check the alignment parameters given in packed attributes. (The check was previously done in cparser/PackedStruct.ml but now it would come too late.) * cparser/Elab: refactor the checking of alignment parameters between _Alignas, attribute((aligned)), __packed__, and attribute((packed)). * cparser/PackedStructs: simplify the code, some functionality was moved to cparser/Cutil, other to cparser/Elab * cfrontend/C2C: raise an "unsupported" error if a packed struct is defined and -fpacked-structs is not given. Before, the packed attribute would be silently ignored, but now doing so would cause inconsistencies between cfrontend/ and cparser/. * test/regression/packedstruct1.c: add tests to compare the sizes and the offsets produced by the elaborator with those obtained after elaboration.
* Remove the `_Alignas(expr)` construct (#125)Xavier Leroy2018-06-072-36/+32
| | | | The `_Alignas(expr)` construct is not C11, only `_Alignas(type)` is.
* Initialization of anonymous bit-fields in structsXavier Leroy2018-04-251-0/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | For anonymous bit-fields in structs, carrier fields may be introduced which are not initialized since no default initializer are generated earlier. This cause the translation in C2C to throw an error since too few initializers are available. Example: struct s2 { int : 10; int a; int : 10; char b; int : 10; short c; int : 10; } s2 = { 42, 'a', 43 }; To work around this issue we need to generate a default inializer for every new member that does not have a translated member. Based on P#80, with more efficient algorithms. Bug 23362
* Initialization of union bit fieldsXavier Leroy2018-04-252-0/+33
| | | | | | | | | | | Bit fields in unions were initialized like normal fields, causing mismatch on the name of the field. Also: added function Bitfields.carrier_field and refactored. Patch by Bernhard Schommer. Bug 23362
* Turn delicate case of designated re-initialization into error (#70)Xavier Leroy2018-03-302-1/+6
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | Consider: struct P { int x, y; } struct S { struct P p; } struct P p0 = { 1,2 }; struct S s1 = { .p = p0; .p.x = 3 }; ISO C99 and recent versions of Clang initialize s1.p.y to 2, i.e. the initialization of s1.p.y to p0.y implied by ".p = p0" is kept, even though the initialization of s1.p.x to p0.x is overwritten by ".p.x = 3". GCC, old versions of Clang, and previous versions of CompCert initialize s1.p.y to the default value 0. I.e. the initialization ".p = p0" is forgotten, leaving default values for the fields of .p before ".p.x = 3" takes effect. Implementing the proper ISO C99 semantics in CompCert is difficult, owing to a mismatch between the intended semantics and the C.init representation of initializers. This commit turns the delicate case of reinitialization above (re-initializing a member of a composite that has already been initialized as a whole) into a compile-time error. We will then see if the delicate case occurs in practice and needs further attention.
* Add regression test for issue #211Xavier Leroy2018-01-133-1/+17
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* Typo in Makefile: "ia32" is now "x86"Xavier Leroy2017-09-191-1/+1
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* test/*/Makefile: suppress dependencies on ../../ccompXavier Leroy2017-09-111-4/+4
| | | | | Not very useful in practice (make clean is generally done before make all) and problematic under Cygwin where ../../ccomp is really ../../ccomp.exe
* For running tests with the interpreter, use the correct -stdlib optionXavier Leroy2017-08-281-3/+2
| | | | Otherwise the interpreter uses the system's header files instead of CompCert's. This can lead to mismatches e.g. on the definition of wchar_t.
* test/: add a CCOMPOPTS make variable to pass additional compile-time flagsXavier Leroy2017-08-261-1/+1
| | | | E.g. "-Os" for testing in "optimize for size" mode, or "-mthumb" for testing ARM in Thumb2 mode.
* Extend builtin arguments with a pointer addition operator, continuedXavier Leroy2017-07-062-2/+8
| | | | | | | | - Add support for PowerPC, with all addressing modes. - Add support for ARM, with "reg + ofs" addressing mode. - Add support for RISC-V, with the one addressing mode. - Constprop.v: forgot to recurse in BA_addptr - volatile4 test: more tests
* Extend builtin arguments with a pointer addition operatorXavier Leroy2017-07-063-1/+35
| | | | | | This extension enables more addressing modes to be encoded as builtin arguments and used in conjunction with volatile memory accesses. Current status: x86 port only, the only new addressing mode handled is reg + offset.
* RISC-V port and assorted changesXavier Leroy2017-04-288-7/+58
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This commits adds code generation for the RISC-V architecture, both in 32- and 64-bit modes. The generated code was lightly tested using the simulator and cross-binutils from https://riscv.org/software-tools/ This port required the following additional changes: - Integers: More properties about shrx - SelectOp: now provides smart constructors for mulhs and mulhu - SelectDiv, 32-bit integer division and modulus: implement constant propagation, use the new smart constructors mulhs and mulhu. - Runtime library: if no asm implementation is provided, run the reference C implementation through CompCert. Since CompCert rejects the definitions of names of special functions such as __i64_shl, the reference implementation now uses "i64_" names, e.g. "i64_shl", and a renaming "i64_ -> __i64_" is performed over the generated assembly file, before assembling and building the runtime library. - test/: add SIMU make variable to run tests through a simulator - test/regression/alignas.c: make sure _Alignas and _Alignof are not #define'd by C headers commit da14495c01cf4f66a928c2feff5c53f09bde837f Author: Xavier Leroy <xavier.leroy@inria.fr> Date: Thu Apr 13 17:36:10 2017 +0200 RISC-V port, continued Now working on Asmgen. commit 36f36eb3a5abfbb8805960443d087b6a83e86005 Author: Xavier Leroy <xavier.leroy@inria.fr> Date: Wed Apr 12 17:26:39 2017 +0200 RISC-V port, first steps This port is based on Prashanth Mundkur's experimental RV32 port and brings it up to date with CompCert, and adds 64-bit support (RV64). Work in progress.
* Revised elaboration of attributesXavier Leroy2017-01-311-1/+1
| | | | | | | | | | | | | | | | | | | | | The treatment of attributes in the current CompCert is often surprising. For example, attribute(xxx) char * x; is parsed as "x is a pointer to a (char modified by attribute "xxx")", while for most attributes (e.g. section attributes) the expected meaning is "x, modified by attribute "xxx", has type pointer to char". CompCert's current treatment comes from the fact that attributes are processed very much like the standard type modifiers `const` and `volatile`, i.e. const char * x; is really "x is a pointer to a const char", not "x is a const pointer to char". This experiment introduces a distinction between type-related attributes (which include the standard modifiers `const` and `volatile`) and other attributes. The other, non-type-related attributes are "floated up" during elaboration so that they apply to the variable or function being declared or defined. In the examples above, attribute(xxx) char * x; // "attribute(xxx)" applies to "x" const char * x; // "const" applies to "char" This may be a step in the right direction but is not the final story. In particular, the `packed` attribute is special-cased when applied to `struct`, like it was before, and future attributes concerning calling conventions would need to be floated up to function types but not higher than that.
* Make Archi.ptr64 always computable, and reorganize files accordingly: ia32 ↵Xavier Leroy2016-10-273-10/+4
| | | | | | | | | | | | -> x86/x86_32/x86_64 Having Archi.ptr64 as an opaque Parameter that is determined at run-time depending on compcert.ini is problematic for applications such as VST where functions such as Ctypes.sizeof must compute within Coq. This commit introduces two versions of the Archi.v file, one for x86 32 bits (with ptr64 := false), one for x86 64 bits (with ptr64 := true). Unlike previous approaches, no other file is duplicated between these two variants of x86. While we are at it, I renamed "ia32" into "x86" everywhere. "ia32" is Intel speak for the 32-bit architecture. It is not a good name to describe both the 32 and 64 bit architectures. Finally, .depend is no longer under version control and is regenerated when the target architecture changes. That's because the location of Archi.v differs between the ports that have 32/64 bit variants (x86 so far) and the ports that have only one bitsize (ARM and PowerPC so far).
* Update the tests in test/regression, continuedXavier Leroy2016-10-242-13/+5
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* Update the tests and test infrastructure in test/regressionXavier Leroy2016-10-2412-7/+132
| | | | | Tests updated to work with x86 64 bits. Infrastructure added: script "Runtest", with ability to have different reference outputs depending on platform or bit size.
* Turn 64-bit integer division and modulus by constants into multiply-highXavier Leroy2016-10-042-0/+2172
| | | | | | This trick was already implemented for 32-bit integer division and modulus. Here we extend it to the 64-bit case. For 32-bit target processors, the runtime library must implement 64-bit multiply-high (signed and unsigned). Tentative implementations are provided for IA32 and PowerPC, but need testing.
* Support for 64-bit architectures: generic supportXavier Leroy2016-10-011-5/+5
| | | | | | | | | | | - Introduce Archi.ptr64 parameter. - Define module Ptrofs of integers as wide as a pointer (64 if Archi.ptr64, 32 otherwise). - Use Ptrofs.int as the offset type for Vptr values and anywhere pointer offsets are manipulated. - Modify Val operations that handle pointers (e.g. Val.add, Val.sub, Val.cmpu) so that in 64-bit pointer mode it is the "long" operation (e.g. Val.addl, Val.subl, Val.cmplu) that handles pointers. - Update the memory model accordingly. - Modify C operations that handle pointers (e.g. addition, subtraction, comparisons) accordingly. - Make it possible to turn off the splitting of 64-bit integers into pairs of 32-bit integers. - Update the compiler front-end and back-end accordingly.
* Implement support for big endian arm targets.Bernhard Schommer2016-08-052-3/+3
| | | | | | | | Adds support for the big endian arm targets by making the target endianess flag configurable, adding support for the big endian calling conventions, rewriting memory access patterns and adding big endian versions of the runtime functions. Bug 19418
* Updates to the local test suiteXavier Leroy2016-07-241-10/+0
| | | | | | | - Adjust parameters to bring the running time of each test closer to 1 second - compression/arcode.c: array access one past - "inline" -> "static inline" - Remove cchecklink support
* Unwanted partial constant propagation in 64-bit integer arguments to builtinsXavier Leroy2016-07-087-0/+17
| | | | | | | | | | | | | | Here are two examples that cause an internal error in Asmexpand.ml: volatile long long x; void f(unsigned int i) { x = i; } unsigned g(unsigned i) { return __builtin_clzll(i); } The argument "i" to builtin volatile store or __builtin_clzll is turned into a BA_splitlong(BA_int 0, BA <variable i>), which Asmexpand.ml doesn't know how to handle. The fix (in AST.builtin_arg_ok) is to prevent this 'optimization' for all builtins except those of the "OK_all" kind, i.e. __builtin_annot. Regression tests were added and tested on IA32. Need to retest on ARM and PowerPC.
* Revised handling of old-style, K&R function definitionsXavier Leroy2016-06-243-1/+41
| | | | | | | | This commits handles the case where the argument is passed with a type different from the actual type of the argument, as in float f (x) float x; { return x; } "x" is passed with type "double", and must be converted to "float" at the beginning of the function.
* Fix a bug in the pre-parser.Jacques-Henri Jourdan2016-03-231-0/+17
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* Add CLZ builtins for ARM and IA32Xavier Leroy2015-12-226-4/+24
| | | | | | | ARM: add __builtin_clzl, __builtin_clzll IA32: add __builtin_clzl, __builtin_clzll, __builtin_ctzl, __builtin_ctzll Add corresponding tests in tests/regression/
* Issue #71: incorrect initialization of wchar_t arrays from wide string literalXavier Leroy2015-11-132-0/+29
| | | | Regression test added in regression/initializers.c
* Merge remote-tracking branch 'origin/master' into parser_fixJacques-Henri Jourdan2015-11-044-0/+9
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| * Merge branch 'ppc64' of ssh://github.com/AbsInt/CompCert into ppc64Xavier Leroy2015-10-112-0/+4
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| | * Test __builtin_isel.Xavier Leroy2015-09-132-0/+4
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* | | Better handling of old-style K&R function declarations:Jacques-Henri Jourdan2015-11-012-3/+69
| | | | | | | | | | | | | | | | | | - Added a Cabs.PROTO_OLD constructor to Cabs.decl_type - Refactored the Parser.vy and pre_parser.mly grammars - Rewritten the conversion of old function definitions to new-style
* | | other, simpler fix: the lexer emits 2 tokens for each identifierJacques-Henri Jourdan2015-10-081-0/+17
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* | Fixed a few bugs in the pre parser. In particular, the following codeJacques-Henri Jourdan2015-09-303-1/+106
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | was not parsed correctly: typedef int a; int f() { for(int a; ;) if(1); a * x; } Additionnaly, I tried to add some comments in the pre-parser code, especially for the different hacks used to solve various conflicts.
* | Issue with ignoring the result of non-void builtin functions.Xavier Leroy2015-09-153-3/+12
| | | | | | | | In RTL and beyond, the result of a builtin function that has return type different from "void" must be BR, never BR_none. Otherwise, we get compile-time fatal errors, either in Asmexpand or in Lineartyping.
* | Use standard headers instead of defining our own ptrdiff_t and uintptr_t.Xavier Leroy2015-09-141-2/+2
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* test/regression: test packedstruct1 only if unaligned accesses are supported.Xavier Leroy2015-08-211-2/+11
| | | | Also: exit on error when a test fails.
* More tests for alias analysis.Xavier Leroy2015-07-202-6/+30
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* Test to check that alias analysis is prudently conservative on ill-defined ↵Xavier Leroy2015-07-193-1/+153
| | | | pointer manipulations.
* Merge branch 'master' of https://github.com/AbsInt/CompCertXavier Leroy2015-07-086-13/+52
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| * Turn off copy optimization when returning a composite by reference.Xavier Leroy2015-07-083-1/+40
| | | | | | | | | | | | The copy optimization is not correct in case of overlap between destination and source. We would need to use an hypothetical __builtin_memmove_aligned that can cope with overlap to implement the copy at return of callee.
| * Fix issue with bit fields of type _BoolXavier Leroy2015-07-083-12/+12
| | | | | | | | | | | | cparser/Bitfields.ml: when assigning to a bit field of type _Bool, the right-hand side must be normalized to 0 or 1 via a cast to _Bool. test/regression/bitfields{1,9}.c: add corresponding test cases.
* | More portable test for fres and fsqrte.Xavier Leroy2015-07-083-7/+16
|/ | | | These instructions are approximate and produce different results on different processors. Just check the error bounds specified in the PPC ISA.
* Signedness issue in specification of subtraction between two pointers.Xavier Leroy2015-06-303-1/+13
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