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Author SHA1 Message Date
Leonardo de Moura
e3efe39eeb fix(elaborator): fix bug in higher-order matching/unification 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-10-24 17:53:37 -07:00
Leonardo de Moura
d1a2a4ea7e feat(frontends/lean/elaborator): add support for coercions in let declarations 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-10-24 17:01:06 -07:00
Leonardo de Moura
872b698bc3 feat(elaborator): add option m_assume_injectivity for getting more concise solutions 
We may miss solutions, but the solutions found are much more readable.
For example, without this option, for elaboration problem

Theorem Example4 (a b c d e : N) (H: (a = b ∧ b = e ∧ b = c) ∨ (a = d ∧ d = c)) : (h a c) = (h c a) :=
    DisjCases H
              (fun H1 : _,
                   let AeqC := Trans (Conjunct1 H1) (Conjunct2 (Conjunct2 H1))
                   in CongrH AeqC (Symm AeqC))
              (fun H1 : _,
                   let AeqC := Trans (Conjunct1 H1) (Conjunct2 H1)
                   in CongrH AeqC (Symm AeqC))

the elaborator generates

Theorem Example4 (a b c d e : N) (H : a = b ∧ b = e ∧ b = c ∨ a = d ∧ d = c) : (h a c) = (h c a) :=
    DisjCases
        H
        (λ H1 : if
               Bool
               (if Bool (a = b) (if Bool (if Bool (if Bool (b = e) (if Bool (b = c) ⊥ ⊤) ⊤) ⊥ ⊤) ⊥ ⊤) ⊤)
               ⊥
               ⊤,
           let AeqC := Trans (Conjunct1 H1) (Conjunct2 (Conjunct2 H1)) in CongrH AeqC (Symm AeqC))
        (λ H1 : if Bool (if Bool (a = d) (if Bool (d = c) ⊥ ⊤) ⊤) ⊥ ⊤,
           let AeqC := Trans (Conjunct1 H1) (Conjunct2 H1) in CongrH AeqC (Symm AeqC))

The solution is correct, but it is not very readable. The problem is that the elaborator expands the definitions of \/ and /\.

Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-10-24 16:47:50 -07:00
Leonardo de Moura
d2f9c24d3c fix(tests/lean): adjust tests 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-10-24 15:42:17 -07:00
Leonardo de Moura
a7f94b55db fix(frontends/lean/elaborator): fix bugs and adjust tests 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-10-24 15:29:56 -07:00
Leonardo de Moura
bbc265ded4 feat(frontends/lean): hook new elaborator in the default frontend 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-10-24 15:14:29 -07:00
Leonardo de Moura
c9f7b8bce2 feat(frontends/lean): add get_coercions method 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-10-24 14:38:09 -07:00
Leonardo de Moura
71ccec5b9e refactor(frontends/lean/elaborator): delete old_elaborator, and create frontend_elaborator class that will be based on library/elaborator/elaborator 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-10-24 10:45:59 -07:00
Leonardo de Moura
449454efdb fix(debug): remove typeid information from assertion, the names are mangled and are not very useful 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-10-23 16:41:51 -07:00
Leonardo de Moura
434c33f225 feat(metavar): automatically apply beta-reduction when instantiating metavariable applications (i.e., expressions of the form (?m a)), when the metavariable is a lambda 
This feature is useful for problems that require higher-order matching and/or unification.

Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-10-23 16:35:50 -07:00
Leonardo de Moura
873e56844a refactor(beta_reduction): add function apply_beta 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-10-23 16:03:52 -07:00
Leonardo de Moura
f1e0d6ec29 refactor(beta_reduction): move beta reduction functions to the kernel, delete reduce.cpp file and tests 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-10-23 15:44:26 -07:00
Leonardo de Moura
c1e451151a feat(replace_visitor): add an abstract class for applying transformations on expressions 
I also removed replace_using_ctx since it is subsumed by the new class.

Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-10-23 15:01:37 -07:00
Leonardo de Moura
13531b7d3e refactor(kernel): rename trace to justification 
Motivations:

- We have been writing several comments of the form "... trace/justification..." and "this trace object justify ...".
- Avoid confusion with util/trace.h

Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-10-23 13:42:17 -07:00
Leonardo de Moura
8e1a75ce1c feat(elaborator): only process upper bound constraints when the corresponding metavariable does not have lower bound and max constraints 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-10-23 13:09:13 -07:00
Leonardo de Moura
172567a2fb feat(elaborator): add support for upper bounds, max constraints, and fix bugs 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-10-23 12:01:39 -07:00
Leonardo de Moura
17b48010b7 fix(unification_constraint): fix printer for max constraints 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-10-23 12:00:29 -07:00
Leonardo de Moura
274b11530f feat(metavar): improve apply_local_context 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-10-23 11:59:36 -07:00
Leonardo de Moura
b57f492e2d fix(kernel/printer): improve printer for Type expressions 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-10-23 11:58:49 -07:00
Leonardo de Moura
c635c16637 refactor(ho_unifier): remove ho_unifier, it has been subsumed by the elaborator class 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-10-22 17:51:54 -07:00
Leonardo de Moura
019f64671b fix(elaborator): add basic support for flex-flex pairs, add more tests, fix bug when enumerating different solutions 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-10-22 17:49:37 -07:00
Leonardo de Moura
80a507cf45 refactor(tests/frontends/lean/implicit_args): remove implicit_args unit tests from frontends/lean, all tests were moved to tests/library/elaborator 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-10-22 16:42:07 -07:00
Leonardo de Moura
7ad256131e feat(elaborator): add support for constraints of the form ?m[inst, ...] == t, fix bugs, add more tests 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-10-22 16:39:22 -07:00
Leonardo de Moura
891d22b3de feat(kernel/context): add method for remove context entries at positions [s, s+n). 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-10-22 15:52:24 -07:00
Leonardo de Moura
3fa4eac4ef fix(replace_using_ctx_fn): typo 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-10-22 15:46:11 -07:00
Leonardo de Moura
8142726923 fix(type_inferer): bug when inferring the type of free variables 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-10-22 15:41:22 -07:00
Leonardo de Moura
874f67c605 feat(normalizer): remove normalization rule t == t ==> true 
This normalization rule is not really a computational rule.
It is essentially encoding the reflexivity axiom as computation.
It can also be abaused. For example, with this rule,
the following definition is valid:

Theorem Th : a = a := Refl b

Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-10-22 14:02:48 -07:00
Leonardo de Moura
5e61496381 test(elaborator): add more tests 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-10-22 13:45:20 -07:00
Leonardo de Moura
a5b4908f71 fix(elaborator): process_simple_ho_match and missing cases 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-10-22 13:45:04 -07:00
Leonardo de Moura
cb2c73cf37 feat(elaborator): add higher-order matching support to elaborator 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-10-22 11:22:00 -07:00
Leonardo de Moura
f4592da87f feat(elaborator): solve more unification constraints, add more tests 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-10-22 08:15:37 -07:00
Leonardo de Moura
c3e87f106f fix(kernel/trace): fix typo in depends_on 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-10-22 08:15:37 -07:00
Leonardo de Moura
dc51d35dc0 feat(library/type_inferer): add support for metavariables at type_inferer 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-10-22 08:15:37 -07:00
Leonardo de Moura
7f96c07a01 refactor(library): rename light_checker to type_inferer 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-10-22 08:15:36 -07:00
Leonardo de Moura
183f5a1ccf feat(elaborator): solve unification constraints 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-10-22 08:15:36 -07:00
Leonardo de Moura
a1710aeeb9 feat(elaborator): add trace objects for elaborator 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-10-22 08:15:36 -07:00
Leonardo de Moura
dc0e7a4472 feat(pos_info_provider): add position information provider for expressions 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-10-22 08:15:36 -07:00
Leonardo de Moura
8663ac550f feat(kernel/trace): add function depends_on for trace objects 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-10-22 08:15:36 -07:00
Leonardo de Moura
42edc4a72d test(set): add set of pointers test 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-10-22 08:15:36 -07:00
Leonardo de Moura
b1b49e86e7 test(elaborator): add simple test 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-10-22 08:15:36 -07:00
Leonardo de Moura
1548ffabb1 feat(elaborator): add new elaborator interface 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-10-22 08:15:36 -07:00
Leonardo de Moura
827c65b5e9 feat(kernel): add static_assert for update_metavar 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-10-22 08:15:36 -07:00
Leonardo de Moura
61ccaf741c fix(frontend/lean): minor modification to be able to execute lean frontend while refactoring elaborator 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-10-22 08:15:36 -07:00
Leonardo de Moura
7cf83800c0 refactor(metavar): implement metavar_env, and use unification_constraint and trace objects in the type_checker, light_checker 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-10-22 08:15:36 -07:00
Leonardo de Moura
1f0eab7a14 test(type_checker): add new tests for type_checker trace objects 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-10-22 08:15:36 -07:00
Leonardo de Moura
fc288929a2 feat(type_checker): add trace objects to justify constraints created by the type checker 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-10-22 08:15:36 -07:00
Leonardo de Moura
5b1b03bafd refactor(is_convertible): move from normalizer to type_checker class 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-10-22 08:15:36 -07:00
Leonardo de Moura
85bfa45e6a refactor(kernel_exception): delete kernel_exception_formatter, and implement kernel_exception pretty printer as a virtual method 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-10-22 08:15:36 -07:00
Leonardo de Moura
d843d432d3 refactor(kernel): move printer and formatter objects to the kernel 
The printer and formatter objects are not trusted code.
We moved them to the kernel to be able to provide them as an argument to the trace objects.
Another motivation is to eliminate the kernel_exception_formatter hack.
With the formatter in the kernel, we can implement the pretty printer for kernel exceptions as a virtual method.

Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-10-22 08:15:36 -07:00
Leonardo de Moura
ddb90d3038 feat(kernel): add unification_constraint and trace objects to the kernel 
Trace objects will be used to justify steps performed by engines such as the elaborator. We use them to implement non-chronological backtracking in the elaborator. They are also use to justify to the user why something did not work.

The unification constraints are in the kernel because the type checker may create them when type checking a term containing metavariables.

Remark: a minimalistic kernel does not need to include metavariables, unification constraints, nor trace objects. We include these objects in our kernel to minimize code duplication.

Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-10-22 08:15:36 -07:00