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Author SHA1 Message Date
Leonardo de Moura
cd30bb49c1 chore(library/arith): remove unnecessary library 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2014-04-29 16:14:15 -07:00
Leonardo de Moura
49e626a0e0 refactor(kernel/metavar): switch to functional substitution datastructure 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2014-04-29 10:22:36 -07:00
Leonardo de Moura
1681dc2389 test(kernel): add new environment tests 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2014-04-28 14:04:05 -07:00
Leonardo de Moura
e769c26800 refactor(kernel): move files that don't need to be in the kernel 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2014-04-25 18:30:40 -07:00
Leonardo de Moura
a39a5b4195 refactor(kernel): remove normalizer 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2014-04-25 12:02:33 -07:00
Leonardo de Moura
508bccb0c5 fix(kernel/max_sharing): add example exposing bug in max_sharing_fn, and fix it 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2014-04-24 15:55:48 -07:00
Leonardo de Moura
f99444b130 chore(tests): move max_sharing unit tests to tests/kernel 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2014-04-22 16:01:30 -07:00
Leonardo de Moura
9fda7e2529 fix(kernel): incorrect optimization in max_sharing_fn class 
The resultant expression may failed to be fully shared.
Add an example that demonstrates the problem.

Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2014-04-22 15:38:22 -07:00
Leonardo de Moura
3b78af0db5 chore(tests/library): enable old tests 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2014-04-22 12:05:49 -07:00
Leonardo de Moura
984ac03ac7 refactor(kernel): replace kernel object with definition, disable affected files 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2014-04-17 16:10:47 -07:00
Leonardo de Moura
3712da0b54 refactor(kernel/instantiate): use get_free_var_range to improve instantiate, remove instantiate_with_closed, fix index overflow bug 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2014-04-17 13:12:49 -07:00
Leonardo de Moura
1fd5e9682d refactor(kernel/free_vars): use get_free_var_range to improve lift_free_vars and lower_free_vars performance 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2014-04-17 12:41:06 -07:00
Leonardo de Moura
1fd447b451 chore(util): fix style 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2014-04-17 10:54:10 -07:00
Leonardo de Moura
bc8379256a refactor(kernel): remove pairs from kernel 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2014-04-17 10:52:07 -07:00
Leonardo de Moura
c78e6787aa test(util/rb_tree): multi-thread test for rb trees 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2014-03-20 10:20:28 -07:00
Leonardo de Moura
3651b4ecd0 refactor(kernel): replace_fn functional object 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2014-03-18 10:27:57 -07:00
Leonardo de Moura
eb487e44c1 refactor(kernel): use names instead of unsigned integers to encode level parameters 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2014-03-18 10:27:57 -07:00
Leonardo de Moura
aa4a7acccf feat(kernel/level): is_trivial predicate for level constraints 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2014-03-18 10:27:57 -07:00
Leonardo de Moura
41782c0894 test(kernel/metavar): add metavar tests 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2014-03-18 10:27:56 -07:00
Leonardo de Moura
bf13441bd7 fix(kernel): bugs in justification module, add missing metavar methods, add basic metavar tests 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2014-03-18 10:27:56 -07:00
Leonardo de Moura
42e253c962 fix(*): style and clang warnings 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2014-03-18 10:27:56 -07:00
Leonardo de Moura
f855dbb7b0 feat(util): add maps based on red-black trees 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2014-03-18 10:27:56 -07:00
Leonardo de Moura
1ab12eb105 refactor(util/splay_map): remove unnecessary operation 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2014-03-18 10:27:56 -07:00
Leonardo de Moura
528ea367ad feat(util): add red-black trees 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2014-03-18 10:27:56 -07:00
Leonardo de Moura
2a73389ed3 refactor(kernel): justification objects 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2014-03-18 10:27:56 -07:00
Leonardo de Moura
50300126a5 refactor(util/name_generator): make sure there is no risk of overflow, name generators will be extensively used in version 0.2 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2014-03-18 10:27:56 -07:00
Leonardo de Moura
501435f6fc feat(kernel): add has_local predicate 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2014-03-18 10:27:56 -07:00
Leonardo de Moura
6baa59376c refactor(kernel): normalizer 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2014-03-18 10:27:56 -07:00
Leonardo de Moura
eb046c11fb refactor(kernel): the type in let-exprs is not optional anymore, if the user does not provide it, we use a metavariable 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2014-03-18 10:27:55 -07:00
Leonardo de Moura
3c8ccdd33d test(util/exception): experiment with exceptions with nested std::function 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2014-03-18 10:27:55 -07:00
Leonardo de Moura
737fe6830f test(tests/kernel): adjust expr tests 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2014-03-18 10:27:55 -07:00
Leonardo de Moura
73c8bf4436 refactor(tests/kernel): move tests to new kernel 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2014-03-18 10:27:55 -07:00
Leonardo de Moura
72e1678ad9 refactor(kernel): cleanup instantiate and abstract procedures, implement update procedures 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2014-03-18 10:27:55 -07:00
Leonardo de Moura
76b1ddb967 feat(kernel): add difference constraint solver with backtracking support, and justification generation, this solver will be used to check the satisfiability of universe level constraints 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2014-03-18 10:27:54 -07:00
Leonardo de Moura
9f93b5d97e feat(kernel/level): new universe level datastructure for universe level polymorphism 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2014-03-18 10:27:54 -07:00
Leonardo de Moura
1739b5c153 fix(kernel/type_checker): caching bug 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2014-02-12 10:43:01 -08:00
Leonardo de Moura
6d7ec9d7b6 refactor(kernel): add heterogeneous equality back to expr 
The main motivation is that we will be able to move equalities between universes.

For example, suppose we have
    A : (Type i)
    B : (Type i)
    H : @eq (Type j) A B
where j > i

We didn't find any trick for deducing (@eq (Type i) A B) from H.
Before this commit, heterogeneous equality as a constant with type

   heq : {A B : (Type U)} : A -> B -> Bool

So, from H, we would only be able to deduce

   (@heq (Type j) (Type j) A B)

Not being able to move the equality back to a smaller universe is
problematic in several cases. I list some instances in the end of the commit message.

With this commit, Heterogeneous equality is a special kind of expression.
It is not a constant anymore. From H, we can deduce

   H1 : A == B

That is, we are essentially "erasing" the universes when we move to heterogeneous equality.
Now, since A and B have (Type i), we can deduce (@eq (Type i) A B) from H1. The proof term is

  (to_eq (Type i) A B (to_heq (Type j) A B H))  :  (@eq (Type i) A B)

So, it remains to explain why we need this feature.

For example, suppose we want to state the Pi extensionality axiom.

axiom hpiext {A A' : (Type U)} {B : A → (Type U)} {B' : A' → (Type U)} :
      A = A' → (∀ x x', x == x' → B x == B' x') → (∀ x, B x) == (∀ x, B' x)

This axiom produces an "inflated" equality at (Type U) when we treat heterogeneous
equality as a constant. The conclusion

     (∀ x, B x) == (∀ x, B' x)

is syntax sugar for

   (@heq (Type U) (Type U) (∀ x : A, B x) (∀ x : A', B' x))

Even if A, A', B, B' live in a much smaller universe.

As I described above, it doesn't seem to be a way to move this equality back to a smaller universe.

So, if we wanted to keep the heterogeneous equality as a constant, it seems we would
have to support axiom schemas. That is, hpiext would be parametrized by the universes where
A, A', B and B'. Another possibility would be to have universe polymorphism like Agda.
None of the solutions seem attractive.

So, we decided to have heterogeneous equality as a special kind of expression.
And use the trick above to move equalities back to the right universe.

BTW, the parser is not creating the new heterogeneous equalities yet.
Moreover, kernel.lean still contains a constant name heq2 that is the heterogeneous
equality as a constant.

Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2014-02-07 10:28:10 -08:00
Leonardo de Moura
8eec289ce1 feat(kernel): add dependent pairs 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2014-02-03 16:52:49 -08:00
Leonardo de Moura
c56df132b8 refactor(kernel): remove semantic attachments from the kernel 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2014-02-02 14:48:27 -08:00
Leonardo de Moura
9fb3ccb4c0 feat(library/simplifier): support for dependent simplification in lambda expressions 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2014-01-25 16:54:42 -08:00
Leonardo de Moura
abfeacb8f0 fix(tests/library/expr_lt): adjust is_lt unit tests to reflect recent modifications 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2014-01-20 13:44:44 -08:00
Leonardo de Moura
bbf6e6a256 feat(builtin/kernel): create default rule set in the kernel, and adjust unit tests 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2014-01-19 11:24:20 -08:00
Leonardo de Moura
a43020b31b refactor(kernel): remove heterogeneous equality 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2014-01-16 17:39:12 -08:00
Leonardo de Moura
14c6218bdc chore(kernel): file name convention 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2014-01-15 20:06:29 -08:00
Leonardo de Moura
438fa8251b test(kernel/expr): check if the serializer works for metavariables 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2014-01-15 17:15:56 -08:00
Leonardo de Moura
5058e403b5 test(kernel/expr): check if the serializer works for applications with many argumets 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2014-01-15 17:09:46 -08:00
Leonardo de Moura
411f14415d feat(builtin): automatically generate Lean/C++ interface for builtin theories 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2014-01-09 18:09:53 -08:00
Leonardo de Moura
84e211b81b fix(frontends/lean): missing ':' in error messages 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2014-01-09 11:19:58 -08:00
Leonardo de Moura
f7c7dd4ed4 feat(frontends/lean): include filename in error messages, use GNU error message style 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2014-01-09 11:01:27 -08:00
Leonardo de Moura
57c0006916 chore(*): cleanup lean builtin symbols, replace :: with _ 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2014-01-09 08:33:52 -08:00
Leonardo de Moura
a4b3d6d6c8 refactor(builtin/kernel): prove eta using function extensionality, and rename abst and abstpi to funext and allext 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2014-01-08 17:25:14 -08:00
Leonardo de Moura
2b2aa228e3 refactor(builtin/kernel): start with small universes 
The universe constraint manager is more flexible now.
We don't need to start with a huge universe  U >= 512.
We can start small, and increase it on demand.

If module mod1 needs it, it can always add

   universe U >= 3

Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2014-01-08 12:35:00 -08:00
Leonardo de Moura
048151487e feat(kernel): use Pi as forall/implication 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2014-01-08 00:38:39 -08:00
Leonardo de Moura
f12a76a5cd test(frontends/lean/scanner): missing tests 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2014-01-07 15:03:46 -08:00
Leonardo de Moura
5fe8c32da9 feat(kernel): use new universe contraints in the environment, allow new constraints to be added 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2014-01-06 16:46:11 -08:00
Leonardo de Moura
b5a30855f8 feat(kernel/universe_constraints): add new class for managing universe constraints 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2014-01-06 15:01:28 -08:00
Leonardo de Moura
8c956280d9 chore(frontends/lean): rename setoption and setopaque commands to set::option and set::opaque 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2014-01-06 11:41:03 -08:00
Leonardo de Moura
935c2a03a3 feat(*): change name conventions for Lean builtin libraries 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2014-01-05 19:21:44 -08:00
Leonardo de Moura
4ba097a141 feat(frontends/lean): use lowercase commands, replace 'endscope' and 'endnamespace' with 'end' 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2014-01-05 13:06:36 -08:00
Leonardo de Moura
9f08156a73 feat(frontends/lean/parser): combine Echo and Show commands into the 'print' command 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2014-01-05 11:03:35 -08:00
Leonardo de Moura
028a9bd9bd feat(frontends/lean/scanner): use Lua style comments in Lean 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2014-01-05 08:53:27 -08:00
Leonardo de Moura
92c7145d7f feat(kernel/expr): maximize sharing before serializing 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2014-01-02 20:03:42 -08:00
Leonardo de Moura
ecc5d1bc3a refactor(kernel): move printer to library, cleanup io_state interface 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2014-01-02 13:37:50 -08:00
Leonardo de Moura
0592261847 refactor(kernel/io_state): move io_state_stream to library 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2014-01-02 13:14:21 -08:00
Leonardo de Moura
0cb741285c chore(*): do not type check imported modules when running .cpp tests 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2014-01-02 07:11:55 -08:00
Leonardo de Moura
1cb7408c46 fix(kernel/normalizer): metavariable reification was incorrect, add tst11 at tests/kernel/normalizer.cpp to expose the bug 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-12-31 16:24:36 -08:00
Leonardo de Moura
49698bd053 chore(library/all): remove unnecessary files 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-12-30 13:37:25 -08:00
Leonardo de Moura
08718e33dc refactor(builtin): only load the kernel and natural numbers by default 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-12-30 13:35:37 -08:00
Leonardo de Moura
ecd62a1783 refactor(builtin/basic): rename basic.lean to kernel.lean 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-12-30 11:46:03 -08:00
Leonardo de Moura
72761f14e4 refactor(library/io_state): move to the kernel 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-12-30 11:20:23 -08:00
Leonardo de Moura
c3bc6afb12 refactor(library/arith): move int and nat declarations to .lean files. 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-12-30 10:32:14 -08:00
Leonardo de Moura
14c3e11289 refactor(kernel/builtin): emove mk_bin_rop and mk_bin_lop to library 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-12-29 15:23:18 -08:00
Leonardo de Moura
dfe46b9d25 refactor(kernel/builtin): move definition and axioms to basic.lean 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-12-29 14:01:30 -08:00
Leonardo de Moura
411ebbc3c1 refactor(library/basic_thms): move the proof of all basic theorems to a .Lean file 
This commit also adds several new theorems that are useful for implementing the simplifier.
TODO: perhaps we should remove the declarations at basic_thms.h?

Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-12-29 03:04:49 -08:00
Leonardo de Moura
22bebbf242 feat(kernel/object): serializer for kernel objects 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-12-28 14:39:10 -08:00
Leonardo de Moura
755e8b735f feat(kernel/expr): serializer for kernel expressions 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-12-28 01:23:21 -08:00
Leonardo de Moura
0ef8ba2939 feat(kernel/level): serializer for level objects 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-12-27 23:30:13 -08:00
Leonardo de Moura
3715b10ce7 feat(util/sexpr/options): serialization for options 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-12-27 20:40:00 -08:00
Leonardo de Moura
dbebb4a4a1 feat(util/sexpr): serialization for sexpr 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-12-27 20:19:56 -08:00
Leonardo de Moura
9c6dc5d230 feat(util/serializer): add hackish write_double/read_double 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-12-27 19:46:45 -08:00
Leonardo de Moura
abc370a011 feat(util/numerics): serialization for mpz and mpq 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-12-27 18:32:01 -08:00
Leonardo de Moura
49df0c435d feat(util/serializer): make sure the read/write is portable 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-12-27 18:07:19 -08:00
Leonardo de Moura
d05695c331 feat(util/name): serialization for hierarchical names 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-12-27 17:47:20 -08:00
Leonardo de Moura
b72937c02c feat(util/serializer): simple serialization infrastructure 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-12-27 16:50:06 -08:00
Leonardo de Moura
60ac0b508d fix(tests/kernel/environment): adjust the test to reflect (recent) change in the normalizer 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-12-24 21:14:22 -08:00
Soonho Kong
de018220e1 feat(*): use std::make_shared to create shared_ptr 2013-12-24 14:32:50 -05:00
Leonardo de Moura
702f0c2190 fix(tests/kernel/free_vars): reduce example stack size consumption 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-12-23 12:57:25 -08:00
Leonardo de Moura
4229e498d2 refactor(kernel/type_checker): combine type_checker and type_inferer into a single class, and avoid code duplication 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-12-22 11:51:38 -08:00
Leonardo de Moura
df58eb132e feat(frontends/lean): simplify explicit version names 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-12-21 17:05:25 -08:00
Leonardo de Moura
97145c0f88 fix(library/elaborator): bug in free variable normalization (lift was missing) 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-12-21 06:41:09 -08:00
Leonardo de Moura
7b0b363b32 fix(kernel/normalizer): metavariable reification 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-12-21 06:40:26 -08:00
Leonardo de Moura
7772c16033 refactor(kernel): add unfold_opaque flag to normalizer, modify how type checker uses the opaque flag, remove hidden_defs, and mark most builtin definitions as opaque 
After this commit, in the type checker, when checking convertability, we first compute a normal form without expanding opaque terms.
If the terms are convertible, then we are done, and saved a lot of time by not expanding unnecessary definitions.
If they are not, instead of throwing an error, we try again expanding the opaque terms.
This seems to be the best of both worlds.
The opaque flag is a hint for the type checker, but it would never prevent us from type checking  a valid term.

Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-12-20 12:47:47 -08:00
Leonardo de Moura
daef2b7b24 feat(util/sexpr/options): add is_eqp predicate for options 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-12-20 10:53:53 -08:00
Leonardo de Moura
ae01d3818d fix(frontends/lean/parser): parse_type method 
The parser had a nasty ambiguity. For example,
    f Type 1
had two possible interpretations
    (f (Type) (1))
or
    (f (Type 1))

To fix this issue, whenever we want to specify a particular universe, we have to precede 'Type' with a parenthesis.
Examples:
    (Type 1)
    (Type U)
    (Type M + 1)

Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-12-19 15:24:34 -08:00
Leonardo de Moura
dd72269b13 feat(frontends/lean): rename command Set to SetOption 
It is not nice to have Set as a reserved keyword. See example examples/lean/set.lean

Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-12-18 21:18:48 -08:00
Leonardo de Moura
97b872a05c refactor(frontends/lean): remove frontend class, it is not needed anymore 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-12-18 14:37:55 -08:00
Leonardo de Moura
10f28c7bec feat(kernel/replace_fn): non-recursive replace_fn 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-12-17 16:35:39 -08:00
Leonardo de Moura
836357c65c fix(kernel/normalizer): bug in Let normalization 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-12-17 12:35:25 -08:00
Leonardo de Moura
f09fd0fc04 feat(kernel/printer): include de Bruijn index in the debug printer 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-12-16 16:56:46 -08:00
Leonardo de Moura
af42078205 fix(kernel): incorrect use of scoped_map 
This commit also adds a new test that exposes the problem.
The scoped_map should not be used for caching values in the normalizer and type_checker. When we extend the context, the meaning of all variables is modified (we are essentially performing a lift). So, the values stored in the cache are not correct in the new context.

Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-12-16 15:11:39 -08:00
Leonardo de Moura
2253d8079b chore(util/pdeque): remove unused template 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-12-14 23:31:44 -08:00
Leonardo de Moura
5aa9264091 feat(util/list): add remove_last template 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-12-14 23:08:10 -08:00
Leonardo de Moura
1b1032eb99 feat(util/list): improved filter that reuses list cells 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-12-14 20:15:37 -08:00
Leonardo de Moura
02ee31b786 feat(kernel/normalizer): provide the metavar_env to instantiate and add_inst in the normalizer, it will minimize the number of local_entries needed 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-12-14 15:41:50 -08:00
Leonardo de Moura
4357c9196e feat(kernel/metavar): make sure that a metavariable 'm' can only be assigned to a term that contains free variables available in the context associated with 'm' 
This commit also simplifies the method check_pi in the type_checker and type_inferer.
It also fixes process_meta_app in the elaborator.
The problem was in the method process_meta_app and process_meta_inst.
They were processing convertability constrains as equality constraints.
For example, process_meta_app would handle

    ctx |- Type << ?f b

as

    ctx |- Type =:= ?f b

This is not correct because a ?f that returns (Type U) for b satisfies the first but not the second.

Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-12-14 12:25:00 -08:00
Leonardo de Moura
51aee83b70 refactor(kernel/metavar_env): use the same approach used in the class environment in the class metavar_env 
This modification was motivated by a bug exposed by tst17 at tests/kernel/type_checker.
metavar_env is now a smart point to metavar_env_cell.
ro_metavar_env is a read-only smart pointer. It is useful to make sure we are using proof_state correctly.

example showing that the approach for caching metavar_env is broken in the type_checker

Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-12-13 18:59:15 -08:00
Soonho Kong
46e7802d9a test(library/rewriter): add lambda_{body/type}_rewriter tests 2013-12-13 15:08:23 -05:00
Leonardo de Moura
450d6a4b1e refactor(util/splay_tree): replace find with splay_find 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-12-12 17:27:30 -08:00
Leonardo de Moura
f97c260b0b refactor(kernel/environment): add ro_environment 
The environment object is a "smart-pointer".
Before this commit, the use of "const &" for environment objects was broken.
For example, suppose we have a function f that should not modify the input environment.
Before this commit, its signature would be
       void f(environment const & env)
This is broken, f's implementation can easilty convert it to a read-write pointer by using
the copy constructor.
       environment rw_env(env);
Now, f can use rw_env to update env.

To fix this issue, we now have ro_environment. It is a shared *const* pointer.
We can convert an environment into a ro_environment, but not the other way around.

ro_environment can also be seen as a form of documentation.
For example, now it is clear that type_inferer is not updating the environment, since its constructor takes a ro_environment.

Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-12-12 16:48:34 -08:00
Leonardo de Moura
1852c86948 feat(kernel): improve instantiate and lift_free_vars (use metavar_env to minimize the number of lift and inst local_entries needed) 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-12-12 16:48:33 -08:00
Leonardo de Moura
058bdb88ac feat(kernel/context): add operator== for contexts, and new constructor 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-12-12 16:48:33 -08:00
Leonardo de Moura
0e2b7973cf feat(kernel/free_vars): improve has_free_vars function, it produces better results for expressions containing metavariables 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-12-11 16:09:33 -08:00
Leonardo de Moura
af1b0d2e81 feat(library): add function free_var_range for computing the range [0, R) of free variables occurring in an expression 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-12-11 15:32:50 -08:00
Leonardo de Moura
cdec9762ce chore(util/pvector): remove unused template 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-12-10 20:32:10 -08:00
Leonardo de Moura
4de5f06a97 fix(library/elaborator): bug in process_metavar_inst, and disable simplification that is negatively impacting the elaborator 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-12-10 19:26:58 -08:00
Leonardo de Moura
abe2cf2fb5 feat(frontends/lean): simplify how implicit parameters are marked 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-12-10 12:11:04 -08:00
Leonardo de Moura
e7ae749221 feat(boost): implement multi-threading support using Boost 
To use Boost instead of the standard library, we must use the cmake option
    -D BOOST=ON

Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-12-09 17:24:32 -08:00
Leonardo de Moura
8f2fe273ea refactor(*): isolate std::thread dependency 
This commit allows us to build Lean without the pthread dependency.
It is also useful if we want to implement multi-threading on top of Boost.

Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-12-09 15:20:26 -08:00
Leonardo de Moura
04b67f8b14 refactor(kernel/object): remove 'null' object, and operator bool for kernel objects 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-12-08 14:37:38 -08:00
Leonardo de Moura
2f88d6710c feat(kernel/expr): add some_expr and none_expr for building values of type optional<expr> 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-12-08 10:34:38 -08:00
Leonardo de Moura
25b812f1c9 feat(kernel/expr): no overhead optional<expr> template specialization 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-12-08 10:17:29 -08:00
Leonardo de Moura
3e1fd06903 refactor(kernel/expr): remove 'null' expression, and operator bool for expression 
After this commit, a value of type 'expr' cannot be a reference to nullptr.
This commit also fixes several bugs due to the use of 'null' expressions.

TODO: do the same for kernel objects, sexprs, etc.

Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-12-07 23:21:10 -08:00
Leonardo de Moura
e2999d3ff6 feat(*): add component name to check_stack and check_system 
I also reduced the stack size to 8 Mb in the tests at tests/lean and tests/lean/slow. The idea is to simulate stackoverflow conditions.

Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-12-07 15:11:55 -08:00
Leonardo de Moura
195ea24d71 refactor(kernel/type_checker): pass buffer<unification_constraint> as a pointer 
The idea is to make it an optional parameter independent of metavar_env.

Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-12-07 10:27:11 -08:00
Leonardo de Moura
c841763a05 feat(library/elaborator): add special treatment for constraints of the form ?m[inst:i v] << t, where t is a proposition 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-12-06 04:51:07 -08:00
Leonardo de Moura
43ef8b9a4b refactor(library/tactic): rename boolean.* to boolean_tactics.* 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-12-05 05:03:18 -08:00
Leonardo de Moura
fa35fd6989 chore(*): make sure LEAN_THREAD_UNSAFE build flag is handled correctly 
When LEAN_THREAD_UNSAFE=ON, we:

- Do not run tests at tests/lua/threads
- Disable thread object at Lua API
- par tactical becomes an alias for interleave
- Disable some unit tests that use threads

Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-12-04 10:27:22 -08:00
Leonardo de Moura
bcc8b67592 chore(*): consistent file name convention 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-12-03 12:40:52 -08:00
Leonardo de Moura
d79b2babd3 fix(*): typo 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-12-02 08:46:47 -08:00
Soonho Kong
4de3b772fd feat(util/stackinfo): implement get_stack_size (Mac OSX version) 2013-12-01 22:24:12 -05:00
Soonho Kong
a2d6918348 fix(library/rewriter): use Abst axiom in lambda_body RW 2013-12-01 22:24:12 -05:00
Soonho Kong
0553d29078 test(library/rewriter): add lambda_rewrite tests 2013-12-01 22:24:12 -05:00
Leonardo de Moura
74dfdd02de feat(util): add primitives for checking the amount of available stack space 
Recursive functions that may go very deep should invoke the function check_stack. It throws an exception if the amount of stack space is limited.

The function check_system() is syntax sugar for
    check_interrupted();
    check_stack();

Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-12-01 17:19:27 -08:00
Leonardo de Moura
737e634556 fix(util/list): bug in map template 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-12-01 08:51:24 -08:00
Soonho Kong
6a6b69ddf4 test(library/rewriter): add test for depth RW 2013-12-01 01:59:21 -05:00
Soonho Kong
ae0508128f refactor(library/rewriter): move apply_rewriter_fn into rewriter.h 2013-12-01 00:57:09 -05:00
Leonardo de Moura
7ff791eb9f feat(util/name_set): add mk_unique (with respect to a name_set) 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-11-30 11:28:38 -08:00
Leonardo de Moura
6da13cc245 feat(util/list): map_append template 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-11-30 11:28:38 -08:00
Leonardo de Moura
fe79bbf2b7 feat(util/list): filter template 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-11-30 11:28:38 -08:00
Soonho Kong
aed8b1fc73 fix(tests/library/rewriter): app_rewriter1_tst 
There was a bug in the app_rewriter1_tst. If we apply the ADD_COMM RW to
f(0), then the result should be f(0) since there is nothing to do for
ADD_COMM.

    f(0) = f(0)

The proof for this equality should be Refl(Nat, f(0)). But it was

    Refl(Nat -> Nat, f)

which is wrong. Somehow, the previous kernel didn't detect this type
mismatch and recent changes of the kernel found the problem.

I fixed the bug and re-enable the test as it was.
 2013-11-30 02:25:30 -05:00
Leonardo de Moura
b41789d085 feat(kernel): add is_bool predicate 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-11-26 11:34:50 -08:00
Leonardo de Moura
c22f863114 refactor(library/tactic): improve solve method 
Now, it produces the following outcomes:
1- A proof
2- A counterexample
3- A list of (unsolved) final states

Remark: the solve method does not check whether the proof or counterexample is correct.

Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-11-25 13:04:12 -08:00
Leonardo de Moura
9dcfa03dd2 feat(library/tactic): add conj_hyp_tactic 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-11-24 21:00:38 -08:00
Leonardo de Moura
48d7afb0e8 feat(library/tactic): add trace_state_tactic 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-11-24 16:44:02 -08:00
Leonardo de Moura
9c42a05b08 feat(library/tactic): add conj_tactic and imp_tactic 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-11-24 16:29:04 -08:00
Leonardo de Moura
1c607f3350 feat(library/tactic): add cond and when tacticals. 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-11-24 12:04:32 -08:00
Leonardo de Moura
8e87ef5da8 feat(util/lazy_list): add repeat and repeat_at_most templates for lazy_lists 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-11-24 11:16:37 -08:00
Leonardo de Moura
40a2f0a588 refactor(util/lazy_list): polish lazy_list API 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-11-23 17:45:01 -08:00
Leonardo de Moura
bcd88cac08 style(util): missing includes 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-11-23 17:05:46 -08:00
Leonardo de Moura
16cf60a04b refactor(library/tactic): modify par and try_for tactics 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-11-23 17:03:59 -08:00
Leonardo de Moura
924187b055 feat(util/lazy_list): add par template for lazy lists) 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-11-23 16:51:17 -08:00
Leonardo de Moura
157a2b36db feat(lazy_list): add timeout template for lazy_lists 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-11-23 16:27:36 -08:00
Leonardo de Moura
f19944cf09 refactor(util/lazy_list): 'lazier' lazy_lists 
In the new implementation, even the head of the lazy list is computed on demand.

Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-11-23 15:33:30 -08:00
Leonardo de Moura
9eb6da2a31 feat(util): add optional template 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-11-23 13:27:22 -08:00
Leonardo de Moura
18d114416f feat(library/tactic): add take and force tacticals 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-11-22 17:05:18 -08:00
Leonardo de Moura
d258a4b7b8 feat(library/tactic): add repeat and repeat_at_most tacticals 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-11-22 16:39:25 -08:00
Leonardo de Moura
8bece1b53d feat(library/tactic): add append, interleave and par tacticals 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-11-22 16:15:03 -08:00
Leonardo de Moura
9fd594533d refactor(library/tactic): simplify tactic framework, add orelse and try_for combinators/tacticals 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-11-22 15:46:43 -08:00
Leonardo de Moura
a776c8b158 feat(util/interrupt): add sleep_for, and simplify request_interrupt 
The Lean sleep_for checks the interrupt flag from time to time.

Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-11-22 11:32:12 -08:00
Leonardo de Moura
935349ec91 fix(tests/util/thread): typo 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-11-22 10:23:20 -08:00
Leonardo de Moura
1f225d2752 feat(util/lazy_list): add useful lazy_list function templates 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-11-22 09:40:56 -08:00
Leonardo de Moura
796fb3c3bf refactor(library/tactic): remove justification_builder 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-11-21 17:29:06 -08:00
Leonardo de Moura
41062fdf9f feat(library/tactic): add pretty printer for goal and proof_state objects, add solve method for tactics, add trivial example 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-11-21 17:29:06 -08:00
Leonardo de Moura
5346b67651 refactor(library/state): rename Lean state object to io_state 
The idea is to make it clear that io_state is distinguish it from proof_state, and from leanlua_state.

Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-11-21 17:29:06 -08:00
Leonardo de Moura
680ec8abba refactor(library/tactic): reorganize tactic API, add assumption_tactic 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-11-21 17:29:06 -08:00
Leonardo de Moura
8515821d56 feat(util/list): add map_filter template 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-11-21 17:29:06 -08:00
Leonardo de Moura
3a6aa2dc75 feat(library/tactic): add tactic framework APIs 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-11-20 17:19:05 -08:00
Leonardo de Moura
87eb254a1a fix(tests/util/thread): incorrect unit test 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-11-20 11:28:19 -08:00
Leonardo de Moura
eba31a0516 test(util/interval): add more tests 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-11-19 19:07:09 -08:00
Leonardo de Moura
a98fdd9be6 refactor(shell): combine lean and leanlua executables in a single executable 
The main motivation is to allow users to configure/extend Lean using .lua files before loading the actual .lean files.
Example:
        ./lean extension1.lua extension2.lua file.lean

Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-11-19 16:48:21 -08:00
Leonardo de Moura
2265ef78c4 feat(util/list): add emplace_front 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-11-19 16:27:31 -08:00
Leonardo de Moura
5cfcb7e144 chore(kernel/for_each): use consistent naming convetions 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-11-19 11:24:02 -08:00
Leonardo de Moura
e10d17a0f4 feat(util/sexpr): avoid recursion when destructing sexpr's 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-11-18 17:46:53 -08:00
Leonardo de Moura
76252816ac perf(util/list): avoid recursion in map and destructor 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-11-18 16:47:52 -08:00
Leonardo de Moura
d67bf995ed feat(util/list): avoid recursion at for_each template 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-11-18 15:52:31 -08:00
Leonardo de Moura
adf4856f88 feat(util/list): add map_reuse template 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-11-18 15:32:02 -08:00
Leonardo de Moura
53dc8c8c57 test(util/shared_mutex): add missing tests 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-11-18 14:03:18 -08:00
Leonardo de Moura
bfc4023a9e fix(tests/kernel/expr): remove unused function 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-11-18 10:09:47 -08:00
Leonardo de Moura
1315378ebb test(*): add missing tests 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-11-18 09:13:34 -08:00
Leonardo de Moura
5254dba195 test(library/update_expr): add missing tests 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-11-17 13:36:15 -08:00
Leonardo de Moura
4ebb3c572a feat(kernel/environment): make the environment throw an exception when weak-ref has expired 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-11-16 18:35:17 -08:00
Leonardo de Moura
8525e8534b feat(lua): expose parse_expr and parse_commands from frontends/lean in the Lua API 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-11-15 16:11:26 -08:00
Leonardo de Moura
3a924a5fb1 perf(lua/name): improve to_name_ext performance 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-11-14 18:06:09 -08:00
Leonardo de Moura
cd6bd79d63 refactor(lua): cleanup Lua API, improve performance 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-11-14 17:33:46 -08:00
Leonardo de Moura
c4c548dc5d feat(*): simplify interrupt propagation 
Instead of having m_interrupted flags in several components. We use a thread_local global variable.
The new approach is much simpler to get right since there is no risk of "forgetting" to propagate
the set_interrupt method to sub-components.

The plan is to support set_interrupt methods and m_interrupted flags only in tactic objects.
We need to support them in tactics and tacticals because we want to implement combinators/tacticals such as (try_for T M) that fails if tactic T does not finish in M ms.
For example, consider the tactic:

    try-for (T1 ORELSE T2) 5

It tries the tactic (T1 ORELSE T2) for 5ms.
Thus, if T1 does not finish after 5ms an interrupt request is sent, and T1 is interrupted.
Now, if you do not have a m_interrupted flag marking each tactic, the ORELSE combinator will try T2.
The set_interrupt method for ORELSE tactical should turn on the m_interrupted flag.

Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-11-12 21:45:48 -08:00
Leonardo de Moura
596e4aeb57 feat(util/shared_mutex): add shared_mutex object, this is a temporary replacement for std::shared_mutex that will be available in C++11 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-11-11 20:00:21 -08:00
Leonardo de Moura
7683188ab0 chore(emplace_back): use emplace_back when appropriate 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-11-10 11:14:04 -08:00
Leonardo de Moura
9c60eed93c refactor(kernel/metavar): avoid using unique names for default metavariable prefix 
The problem is that unique names depend on the order compilation units are initialized. The order of initialization is not specified by the C++ standard. Then, different compilers (or even the same compiler) may produce different initialization orders, and consequently the metavariable prefix is going to be different for different builds. This is not a bug, but it makes unit tests to fail since the output produced by different builds is different for the same input file.
Avoiding unique name feature in the default metavariable prefix avoids this problem.

Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-11-07 10:16:25 -08:00
Leonardo de Moura
2141ee12f4 refactor(frontends/lean): use extension objects to store lean default frontend data in the environment 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-11-07 10:00:12 -08:00
Leonardo de Moura
80e23f98c7 feat(kernel/environment): add environment extension objects, the environment can be extended with frontend specific objects 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-11-06 19:22:30 -08:00
Leonardo de Moura
a57ca284ec fix(tests/library/elaborator): replace eq with my_eq because eq is now a builtin symbol 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-10-29 17:06:32 -07:00
Leonardo de Moura
4dd6cead83 refactor(equality): make homogeneous equality the default equality 
It was not a good idea to use heterogeneous equality as the default equality in Lean.
It creates the following problems.

- Heterogeneous equality does not propagate constraints in the elaborator.
For example, suppose that l has type (List Int), then the expression
     l = nil
will not propagate the type (List Int) to nil.

- It is easy to write false. For example, suppose x has type Real, and the user
writes x = 0. This is equivalent to false, since 0 has type Nat. The elaborator cannot introduce
the coercion since x = 0 is a type correct expression.

Homogeneous equality does not suffer from the problems above.
We keep heterogeneous equality because it is useful for generating proof terms.

Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-10-29 16:20:06 -07:00
Leonardo de Moura
5f11392fcc test(numerics/numeric_traits): add missing test 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-10-28 07:50:33 -07:00
Leonardo de Moura
1d18f60dd5 fix(numerics): add missing numeric_traits<float>::zero() 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-10-28 07:47:23 -07:00
Leonardo de Moura
dbefc91151 fix(kernel/metavar): add normalize assignment justification 
We need that when we normalize the assignment in a metavariable environment.
That is, we replace metavariable in a substitution with other assignments.

Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-10-27 11:02:34 -07:00
Leonardo de Moura
e0ca27bfb3 fix(tests/library/rewriter): warning 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-10-25 08:33:53 -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
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