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Author SHA1 Message Date
Leonardo de Moura
f80106a895 chore(*): use 'explicit operator bool' everywhere. 
operator bool() may produce unwanted conversions.
For example, we had the following bug in the code base.

...
   object const & obj = find_object(const_name(n));
   if (obj && obj.is_builtin() && obj.get_name() == n)
...

obj.get_name() has type lean::name
n              has type lean::expr

Both have 'operator bool()', then the compiler uses the operator to
convert them to Boolean, and then compare the result.
Of course, this is not our intention.

After this commit, the compiler correctly signs the error.
The correct code is

...
   object const & obj = find_object(const_name(n));
   if (obj && obj.is_builtin() && obj.get_name() == const_name(n))
...

Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-12-02 23:02:45 -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
Leonardo de Moura
dd62af1641 feat(frontends/parser): simplified theorem definition using tactical proof 
When using tactics for proving theorems, a common pattern is

     Theorem T : <proposition> := _.
          apply <tactic>.
          ...
          done.

This commit allows the user to write the simplified form:

     Theorem T : <proposition>.
          apply <tactic>.
          ...
          done.

Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-12-02 08:20:18 -08:00
Leonardo de Moura
1ec8f9d536 feat(kernel): add abstraction (aka function extensionality) axiom 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-12-01 13:57:14 -08:00
Leonardo de Moura
70e06f8e86 feat(library/hidden_defs): hidden definitions are just hints for tactics and solvers 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-12-01 10:27:27 -08:00
Leonardo de Moura
a7027a1d00 feat(library/tactic): polish tactic API, and add new example showing how to implement tactics using Lua 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-11-30 00:16:39 -08:00
Leonardo de Moura
18eb9e427f fix(library/tactic): compilation warning 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-11-29 10:35:14 -08:00
Leonardo de Moura
98897b467d feat(frontends/lean/parser): add support for Lua expression code blocks 
In expression code blocks, we do not have to write a "return".
After this commit, the argument of an apply command is a Lua expression instead of a Lua block of code. That is, we can now write

apply (** REPEAT(ORELSE(imp_tactic, conj_tactic, conj_hyp_tactic, assumption_tactic)) **)

instead of

apply (** return REPEAT(ORELSE(imp_tactic, conj_tactic, conj_hyp_tactic, assumption_tactic)) **)

Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-11-29 10:21:24 -08:00
Leonardo de Moura
f9874cd675 feat(library/tactic): add to_tactic_ext, it allows functions that return tactics to be used where a tactic is expected 
For example, after this commit, we can write

simple_tac = REPEAT(ORELSE(imp_tactic, conj_tactic)) .. assumption_tactic

instead of

simple_tac = REPEAT(ORELSE(imp_tactic(), conj_tactic())) .. assumption_tactic()

Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-11-29 09:40:21 -08:00
Leonardo de Moura
066dacea31 feat(library/tactic): add show_tactic, and optional '.' in the end of tactic command 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-11-29 01:33:26 -08:00
Leonardo de Moura
6832b265e9 style(frontends/lean/parse): missing include 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-11-28 21:50:55 -08:00
Leonardo de Moura
5dfb3b8b56 feat(frontends/lean/parse): allow script-code blocks to be used in the apply command 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-11-28 21:48:30 -08:00
Leonardo de Moura
dae86c2ffa feat(frontends/lean/parser): add basic tactic support in the frontend 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-11-28 21:08:12 -08:00
Leonardo de Moura
a2aa90ae66 refactor(util/script_state): replace std::recursive_mutex with std::mutex, and use unlock_guard 
The unlock_guard and exec_unprotected will be useful also for implementing the Lua tactic API.

Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-11-27 15:40:41 -08:00
Leonardo de Moura
f7e8545e97 refactor(frontends/lua): rename leanlua_state to script_state, and move it to util 
This commit also minimizes the dependencies of script_state.

Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-11-27 14:57:36 -08:00
Leonardo de Moura
0934d7b2f4 fix(frontends/lua): make sure Lua 'sleep' function support interruption 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-11-27 13:25:06 -08:00
Leonardo de Moura
e737f501e4 fix(frontends/lua): remove unnecessary function reference 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-11-27 12:58:35 -08:00
Leonardo de Moura
262670abd6 fix(frontends/lua/leanlua_thread): propagate C++ thread over Lua thread boundaries 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-11-27 12:49:12 -08:00
Leonardo de Moura
d87ad9eb7e refactor(util/lua): propagate C++ Lean exceptions in Lua 
The following call sequence is possible:
C++ -> Lua -> C++ -> Lua -> C++

The first block of C++ is the Lean main function.
The main function invokes the Lua interpreter.
The Lua interpreter invokes a C++ Lean API.
Then the Lean API invokes a callback implemented in Lua.
The Lua callback invokes another Lean API.
Now, suppose the Lean API throws an exception.
We want the C++ exception to propagate over the mixed C++/Lua call stack.
We use the clone/rethrow exception idiom to achieve this goal.

Before this commit, the C++ exceptions were converted into strings
using the method what(), and then they were propagated over the Lua
stack using lua_error. A lua_error was then converted into a lua_exception when going back to C++.
This solution was very unsatisfactory, since all C++ exceptions were being converted into a lua_exception, and consequently the structure of the exception was being lost.

Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-11-27 12:25:29 -08:00
Leonardo de Moura
a6f6f49b5f refactor(frontends/lua): add lua_migrate_fn, and make copy_values modular 
copy_values is not a big if-then-else anymore.
Before this change, whenever we added a new kind of userdata, we would have to update copy_values.

Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-11-27 10:32:19 -08:00
Leonardo de Moura
4c323093ac refactor(frontends/lua/leanlua_state): minimize the use of 'friend' directive 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-11-27 09:25:56 -08:00
Leonardo de Moura
feca9dbdf8 refactor(bindings/lua): move to frontends/lua 
Lua API is an integral part of Lean. It does *not* have the same status
of external APIs (e.g., Python) we will add in the future.

We will reserve the directory bindings for external APIs for using Lean
as a library.

Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-11-26 19:30:07 -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
0126fa0499 refactor(kernel): add find_fn, replace for_each_fn with find_fn when appropriate, remove unnecessary function has_cached_type 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-11-19 13:03:46 -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
69be5f6c94 feat(kernel/environment): track which modules were already imported 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-11-17 18:15:44 -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
19533c811b feat(library/script_evaluator): add abstract class that exposes only the API needed by frontend objects 
The main motivation is to break the remove the dependency frontends/lean <-- bindings/lua.
This dependency is undesirable because we want to expose the frontends/lean parser and pretty printer objects at bindings/lua.

Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-11-15 12:13:09 -08:00
Leonardo de Moura
691893258d feat(kernel/expr): add hash code based on allocation time 
The new hash code has the property that given expr_cell * c1 and expr_cell * c2,
if c1 != c2 then there is a high propbability that c1->hash_alloc() != c2->hash_alloc().

The structural hash code hash() does not have this property because we may have
c1 != c2, but c1 and c2 are structurally equal.

The new hash code is only compatible with pointer equality.
By compatible we mean, if c1 == c2, then c1->hash_alloc() == c2->hash_alloc().
This property is obvious because hash_alloc() does not have side-effects.

The test tests/lua/big.lua exposes the problem fixed by this commit.

Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-11-14 02:43:11 -08:00
Leonardo de Moura
eacd60de9c feat(frontends/lean): return the operator associated with constant expressions that are names of builtin values 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-11-13 16:08:21 -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
9a5f86fce6 feat(lua): use (** ... **) instead of {{ ... }} for nested Lua scripts 
The token }} is a bad delimiter for blocks of Lua script code nested in Lean files.
The problem is that the sequence }} occurs very often in Lua code because Lua uses { and } to build tables/lists/arrays.
Here is an example of Lua code that contains the sequence }}
     t = {{1, 2}, {2, 3}, {3, 4}}

In Lean, (* ... *) is used to create comments. Thus, (** ... **) code blocks will not affect
valid Lean files. It also looks reasonably good.

Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-11-12 16:05:49 -08:00
Leonardo de Moura
8190d4fed5 feat(lua): allow Lua scripts to update 'global' options 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-11-12 15:38:00 -08:00
Leonardo de Moura
31abc00db8 chore(*): add LCOV_EXCL_LINE to lean_unreachable statements 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-11-11 09:19:38 -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
8c140ff86f feat(lua): allow lua scripts (embedded in Lean files) to access the environment 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-11-10 11:14:04 -08:00
Leonardo de Moura
57b9657bf0 feat(lua): add lua_exception for wrapping lua errors, and improve Lua error messages in the Lean frontend 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-11-07 15:19:26 -08:00
Leonardo de Moura
a9b2be0b9c feat(frontends/lean): add support for embedded Lua scripts in Lean files 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-11-07 13:56:04 -08:00
Leonardo de Moura
8012c4f644 fix(kernel/environment): add weak reference to environment objects 
We need weak references to environment objects because the environment has a reference to the type_checker and the type_checker has a reference back to the environment. Before, we were breaking the cycle using an "environment const &". This was a dangerous hack because the environment smart pointer passed to the type_checker could be on the stack. The weak_ref is much safer.

Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-11-07 11:29:08 -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
Soonho Kong
044813615e fix: add '#include <tuple>' 2013-11-03 13:00:42 -05:00
Leonardo de Moura
bf998d8661 feat(frontends/lean/parser): allow 'typeless' definitions, the type is inferred by the system 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-11-01 08:51:49 -07:00
Leonardo de Moura
fdea8aba10 feat(frontends/lean/scanner): allow '#' to be used in class B identifiers 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-11-01 08:42:25 -07:00
Leonardo de Moura
96dcd003c6 fix(frontends/lean/parser): associated position with 'type' placeholder 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-10-31 16:27:36 -07:00
Leonardo de Moura
aa99ac6618 feat(kernel/value): allow semantic attachments to use coercions when being pretty printed 
For example, this feature is useful when displaying the integer value 10 with coercions enabled. In this case, we want to display "nat_to_int 10" instead of "10".

Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-10-30 11:42:26 -07:00
Leonardo de Moura
032f5cd7b3 feat(frontends/lean): make the 'expression template' argument in Subst implicit because higher-order matching can infer it. 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-10-30 10:45:43 -07:00
Leonardo de Moura
bc92671ae4 fix(frontends/lean/notation): adjust the implicit arguments of TransExt, and add new test 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-10-29 17:12:50 -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
d0009d0242 feat(frontends/lean): make the first argument of if-expression implicit, add support for marking implicit arguments on builtin symbols (aka semantic attachments) 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-10-29 15:53:50 -07:00
Leonardo de Moura
2d88922543 feat(frontends/lean/elaborator): solve easy overloads at preprocessing time 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-10-29 10:07:15 -07:00
Leonardo de Moura
4564bfa1d3 feat(library/elaborator): improve simple_ho_match 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-10-27 11:17:03 -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
92f5a31976 feat(kernel/expr): add new mk_app template for creating applications using a collection 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-10-27 08:53:58 -07:00
Leonardo de Moura
57d9d23bd4 feat(kernel/for_each): allow function F to interrupt for_each search 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-10-25 14:58:02 -07:00
Leonardo de Moura
e765105ea5 fix(frontends/lean/pp): let expressions 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-10-25 12:30:39 -07:00
Leonardo de Moura
f0e149d77b fix(frontends/lean/pp): fix how Type expressions are pretty printed 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-10-24 20:02:34 -07:00
Leonardo de Moura
65a514ad8a fix(frontends/lean/parser): option propagation 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-10-24 19:04:06 -07:00
Leonardo de Moura
576b4e2169 fix(frontends/lean/pp): missing comma when printing contexts 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-10-24 19:00:24 -07:00
Leonardo de Moura
df07a84d11 feat(frontends/lean/parser): display elaborator error messages 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-10-24 18:48:53 -07:00
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
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
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
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
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
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
Leonardo de Moura
59914a36f3 refactor(metavar): reorganize and simplify metavariables 
- Use hierarchical names instead of unsigned integers to identify metavariables.
- Associate type with metavariable.
- Replace metavar_env with substitution.
- Rename meta_ctx --> local_ctx
- Rename meta_entry --> local_entry
- Disable old elaborator
- Rename unification_problems to unification_constraints
- Add metavar_generator
- Fix metavar unit tests
- Modify type checker to use metavar_generator
- Fix placeholder module

Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-10-22 08:15:36 -07:00
Leonardo de Moura
15979ab991 fix(lean): fix warnings produced by cppcheck 
Fix (relevant) warnings produced by http://cppcheck.sourceforge.net.
Most warnings produced were incorrect. The tool does not seem to support some of the C++11 new features.

Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-09-30 21:38:55 -07:00
Leonardo de Moura
6477708d78 refactor(debug): improve lean_unreachable(), now we can avoid 'fake' return statements 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-09-25 21:27:20 -07:00
Leonardo de Moura
e23813f15d Add support for creating unique internal names. 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-09-24 11:01:30 -07:00
Leonardo de Moura
651c5d6751 Fix warnings and bugs related to unused variables. 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-09-19 22:41:07 -07:00
Soonho Kong
ab6ca82e6f Update to suppress unused-parameter warnings 2013-09-19 22:40:34 -07:00
Leonardo de Moura
2f29ff70d7 Implement higher-order unification 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-09-18 20:46:00 -07:00
Leonardo de Moura
ad901ce087 Use consistent naming conventions 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-09-17 14:43:07 -07:00
Leonardo de Moura
30b19c314a Add basic support for metavariables at is_convertible. Swap is_convertible arguments to make it more intuitive. 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-09-17 07:15:47 -07:00
Leonardo de Moura
da09e7217a Cleanup meta_entry code 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-09-16 19:32:28 -07:00
Leonardo de Moura
99a163f11d Simplify metavariable context. Now, we have only 'lift' and 'inst' instead of 'subst', 'lift' and 'lower' 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-09-16 19:32:28 -07:00
Leonardo de Moura
63e102055e Move metavariables to the kernel. This is the first step for implementing the new elaborator. 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-09-15 12:09:01 -07:00
Soonho Kong
bc60b47295 Apply coding style 2013-09-13 18:48:09 -07:00
Leonardo de Moura
d54834279e Use consistent coding style for if-then-else 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-09-13 12:57:40 -07:00
Leonardo de Moura
8c735f1daa Use consistent coding style for spaces after ',' 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-09-13 12:49:03 -07:00
Leonardo de Moura
2c68117adf Tag TODOs 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-09-13 12:25:21 -07:00
Leonardo de Moura
573ec5ccc2 Rename import_all. The idea is to use consistent name for library files. 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-09-13 09:06:46 -07:00
Leonardo de Moura
0c09e4524a Use consistent names for import functions, and library files. 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-09-13 08:58:34 -07:00
Leonardo de Moura
070c87bef0 Rename arith library files 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-09-13 08:55:09 -07:00
Soonho Kong
5c3866cd71 Use fullpath in #include directives, add missing STL headers 2013-09-13 03:35:29 -07:00
Leonardo de Moura
4c19cc6957 Rename lean frontend files. The prefix lean_ is not necessary anymore. 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-09-12 20:09:35 -07:00
Leonardo de Moura
26097475fd Use fullpath in #include directives. 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-09-12 20:04:10 -07:00
Leonardo de Moura
3657320edb Add basic list functions 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-09-11 19:48:54 -07:00
Leonardo de Moura
6fe86ffefd Fix initialized memory error reported by Valgrind. Disable 2 tests that produce memory leaks due to a bug in g++. 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-09-10 13:51:02 -07:00
Leonardo de Moura
4c67721d32 Fix test error on Cygwin 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-09-09 18:35:11 -07:00
Leonardo de Moura
2ca30571b4 Display the input term in the output of the Check command. It is useful to see the fully elaborated term. 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-09-08 22:55:21 -07:00
Leonardo de Moura
59a589037e Keep expanded form when pretty printings variable declarations with implicit marks (i.e., curly braces) 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-09-08 11:23:46 -07:00
Leonardo de Moura
df116f88e0 Improve pretty printer for Pi's 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-09-08 11:04:07 -07:00
Leonardo de Moura
33c4b44b2b Encapsulate context implementation. The current implementantion based on lists may be a performance problem in the future, and we should be able to change it without affecting the whole code base. 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-09-07 11:15:11 -07:00
Leonardo de Moura
c674bb3790 Add castlib as an independent library 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-09-06 23:40:47 -07:00
Leonardo de Moura
7a9d53d0d7 Refactor arith libraries 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-09-06 23:19:47 -07:00
Leonardo de Moura
7eab229114 Improve check_pi in lean elaborator 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-09-06 18:58:33 -07:00
Leonardo de Moura
c0c2f52087 Add Cast, DomInj and RanInj. Improve operator << for lean_frontend objects. 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-09-06 18:32:15 -07:00
Leonardo de Moura
b62816cc25 Fix problem with pretty printer. Add another test for elaborator 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-09-06 18:01:11 -07:00
Leonardo de Moura
edafd519e1 Add missing case to elaborator 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-09-06 17:43:08 -07:00
Leonardo de Moura
26bf7bcaac Fix bug in the elaborator. Move character ' to class A 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-09-06 17:12:35 -07:00
Leonardo de Moura
8840b37258 Fix type checker and elaborator for let expressions. Fix get_coercions (we need to pass the context). Fix pretty printer for def_type_mismatch_exception. 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-09-06 11:02:00 -07:00
Leonardo de Moura
2459c4ae7c Add (optional) type to let declarations 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-09-06 10:06:26 -07:00
Leonardo de Moura
6f3b0c30fb Add 'Variables' command. 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-09-06 08:48:12 -07:00
Leonardo de Moura
3dc55c452c Parse decimal values 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-09-06 08:48:12 -07:00
Leonardo de Moura
b3a095b068 Fix pretty printer for evaluator 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-09-05 18:57:29 -07:00
Leonardo de Moura
c22bd8b6ed Clean elaborator_exception pretty printing 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-09-05 10:15:52 -07:00
Leonardo de Moura
eb96e6441f Moved kernel exception formatting to kernel_exception_formatter.cpp. 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-09-05 10:15:43 -07:00
Leonardo de Moura
87d3961158 Improve elaborator error messages 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-09-04 16:36:58 -07:00
Leonardo de Moura
408005b730 Fix typo 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-09-04 16:36:57 -07:00
Leonardo de Moura
d41160f8a5 Modify environment. Now, when a builtin value is declared, if it has a unicode alternative representation, then we add it as a definition. Now, everything that occurs in the environment has been 'declared'. 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-09-04 08:53:00 -07:00
Leonardo de Moura
e955c054ca Modify type checker. Now, it only accepts builtin values that have been declared in the environment. The idea is to be able to track which classes of builtin values have been used in a given environment. We want to be able to quantify the size of the trusted code base for a particular development. 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-09-04 08:30:04 -07:00
Leonardo de Moura
00bee9c96e Fix warning produced by clang++ 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-09-04 04:40:43 -07:00
Leonardo de Moura
57c0c69872 Fix bug reported by Valgrind. Reason: m_metavars is a vector of metavar_info; each metavar_info has a context; when we invoke mk_metavar the vector can grow in size, and the context is moved to a new location. The previous location is invalidated. To avoid the problem we have to save ctx in a local variable. 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-09-04 04:29:03 -07:00
Leonardo de Moura
fc9e395818 Define absolute value function and notation for it. Add new example. 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-09-03 20:39:54 -07:00
Leonardo de Moura
3992c4b8f9 Define divides, and add examples 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-09-03 20:18:20 -07:00
Leonardo de Moura
8e7c657cf7 Use expected type of a definition in the elaborator. Improve elaborator solver. Add new example 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-09-03 18:04:42 -07:00
Leonardo de Moura
4a75e2d965 Fix bug when pretty printing function applications where the head is a meta-variable. 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-09-03 17:51:56 -07:00
Leonardo de Moura
51422fe654 Modify the parser for accepting expressions such as: 'fun a b, f a b', 'forall a, f a > 0', etc. This is just syntax sugar for 'fun (a : _) (b : _), f a b' and 'forall a : _, f a > 0' 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-09-03 17:24:05 -07:00
Leonardo de Moura
a154f4e439 Modify Set command in the default lean frontend. Now, the lean prefix (for lean default frontend specific options) is optional when we are in the lean front-end. 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-09-03 11:07:28 -07:00
Leonardo de Moura
544229e5d3 Create pp::unicode option. The idea is to be able to disable unicode characters, but still be able to use mixfix notation. 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-09-03 10:11:45 -07:00
Leonardo de Moura
e031d7bc10 Improve error messages when overloads+coercions do not work 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-09-02 20:05:47 -07:00
Leonardo de Moura
fd44ec8d79 Improve application type mismatch error messages 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-09-02 18:28:12 -07:00
Leonardo de Moura
395513258e Define mod and unary minus 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-09-02 16:31:44 -07:00
Leonardo de Moura
abc939382b Add Real arithmetic. Fix elaborator for coercions. Now, two overloads are considered ambiguous if they need the same number of coercions. Improve pretty printer for nest infix operators with same precedence and associativity. 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-09-02 13:20:00 -07:00
Leonardo de Moura
e218b92a9d Modify verbose message for Set command 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-09-02 12:29:21 -07:00
Leonardo de Moura
0a67679afb Add natural numbers. Fix how coercions and overloads interact (switch to approach used in C++). Add notation for natural and integer arithmetic. Rename m and u universe variables to M and U. 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-09-02 12:24:29 -07:00
Leonardo de Moura
db88920f81 Rename normalize and type_check to normalizer and type_checker (using a consistent naming convention) 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-09-02 08:43:38 -07:00
Leonardo de Moura
c97e669f0c Add coercion support in the elaborator and pretty printer 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-09-01 19:09:07 -07:00
Leonardo de Moura
e8c09015ad Move elaborator to lean default frontend. It is getting too specific 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-09-01 18:22:24 -07:00
Leonardo de Moura
42be7a4989 Add coercion declarations 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-09-01 18:11:28 -07:00
Leonardo de Moura
598daa40bc Refactor elaborator for supporting overloads 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-09-01 10:24:10 -07:00
Leonardo de Moura
b2924bba99 Fix typos 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-09-01 10:03:15 -07:00
Leonardo de Moura
e54338f4a8 Add a real example. Fix bug in the parser 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-08-31 19:32:08 -07:00
Leonardo de Moura
9d9f9797e4 Improve elaborator interface. Now, the metavariables are created inside the elaborator. The elaborator-user only needs to create placeholders. Motivaton: the placeholders are meaningful independently of the elaborator. On the other hand, the metavariables depend on the elaborator state. 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-08-31 17:11:06 -07:00
Leonardo de Moura
71b8b6408e Handle (and pretty print) elaborator error messages in the lean default frontend 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-08-31 16:46:41 -07:00
Leonardo de Moura
dadbf15e70 Change how the (auxiliary) explicit definitions are encoded in the system. The previous encoding was confusing the pretty printer, and the definition looked recursive. 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-08-30 16:37:21 -07:00
Leonardo de Moura
1b6d51b0aa Mark implicit arguments of builtin symbols 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-08-30 15:56:04 -07:00
Leonardo de Moura
4ef4655183 Add homogeneous equality 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-08-30 14:26:12 -07:00
Leonardo de Moura
1e370023b1 Attach elaborator the lean default parser 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-08-30 13:25:30 -07:00
Leonardo de Moura
45d89ace65 Fix name clash problem when pretty printing 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-08-30 13:25:12 -07:00
Leonardo de Moura
2aac94f2e6 Refactor elaborator using new metavar library. 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-08-30 01:25:06 -07:00
Leonardo de Moura
cdab19b88c Simplify the elaborator 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-08-27 20:39:38 -07:00
Leonardo de Moura
8dacd97801 Remove obsolete commands. 2013-08-27 16:03:45 -07:00
Leonardo de Moura
a9c6088d11 Uniform notation declarations. 2013-08-27 15:59:13 -07:00
Leonardo de Moura
5aae838e1c Add missing mixfix notation 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-08-27 10:09:46 -07:00
Leonardo de Moura
85daaea8ce Rename get_exs in oper to get_deno 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-08-27 09:49:48 -07:00
Leonardo de Moura
206c7fa203 Implement support for notation + implicit arguments. Cleanup pretty printer code for handling implicit arguments. 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-08-27 09:45:00 -07:00
Leonardo de Moura
76c968a5b8 Add basic support for hiding implicit arguments when pretty printing. 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-08-26 20:35:10 -07:00
Leonardo de Moura
fc6cc17925 Improve lean pretty printer support for implicit argument annotations 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-08-26 19:19:56 -07:00
Leonardo de Moura
7bca3705ca Add implicit argument declarations to lean parser. 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-08-26 10:16:29 -07:00
Leonardo de Moura
7003f85213 Add implicit argument management to lean frontend. 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-08-26 10:16:29 -07:00
Leonardo de Moura
7e130ac47f Propagate interrupt to normalizer in the lean frontend 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-08-25 11:34:46 -07:00
Leonardo de Moura
b42e04297d Add support for creating meta-variables in the parser. 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-08-25 11:18:19 -07:00
Leonardo de Moura
25e47a8a2f Add check_interrupted 'macro' 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-08-25 11:03:09 -07:00
Leonardo de Moura
ece6e6ca6a Add interrupt to parser. Add elaborator to parser. Add placeholder support in the scanner. 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-08-25 11:02:34 -07:00
Leonardo de Moura
dc91a7adb8 Add Ctrl-C support for interrupting Lean shell. 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-08-24 16:11:35 -07:00
Leonardo de Moura
f0edf2b4a3 Pretty print kernel exceptions. Improve default lean frontend error messages. 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-08-24 13:16:43 -07:00
Leonardo de Moura
0b112b6637 Add sstream to simplify the generation of exception messages. 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-08-24 11:55:17 -07:00
Leonardo de Moura
48ba655bd5 Store position at parser_error. It produces better error messages. 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-08-24 11:30:54 -07:00
Leonardo de Moura
55eaef1a44 Save position information when parsing expression in the lean default fronted. 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-08-24 09:56:07 -07:00
Leonardo de Moura
f1462dc51e Change lean frontend specific options. Now, frontend specific options must begin with the frontend name. 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-08-22 10:55:55 -07:00
Leonardo de Moura
aceae7a1b2 Change policy for adding input to readline history. 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-08-21 19:43:47 -07:00
Leonardo de Moura
bd3b422158 Add support for READLINE. Remark: it is not enabled by default. Rename tcmalloc option to TCMALLOC (using consistent name convention for cmake parameters). 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-08-21 19:08:44 -07:00
Leonardo de Moura
59e63c0421 Add prompt when in interactive mode. Fix Show Environment [num] 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-08-21 18:24:26 -07:00
Leonardo de Moura
31460aa5b8 Add option declarations. Add Help. 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-08-21 17:02:09 -07:00
Leonardo de Moura
65898f6d5b Add Import command 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-08-21 17:02:09 -07:00
Leonardo de Moura
90678566b4 Improve lambda/pi formatting 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-08-21 17:02:09 -07:00
Soonho Kong
3f40953efc Add comments for unicode symbols, fix a typo 2013-08-21 14:35:45 -07:00
Leonardo de Moura
ce470f57db Add set options to lean_parser. Add support for disabling unicode output. Use channels in lean_parser. 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-08-21 12:42:55 -07:00
Leonardo de Moura
6534142fb9 Fix annoying problem when an integer occurs in the end of a command. Example 'Show 1.' was being parsed as 'Show 1.0'. 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-08-21 11:57:22 -07:00
Leonardo de Moura
d750469667 Move frontend to frontends/lean 
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
 2013-08-21 09:04:49 -07:00