Simplifier: new interface, final piece [blocks: #4904] #4874

kroening · 2019-07-04T16:03:00Z

Reviewers of this series of PRs will be pleased to note that now all cases use the new interface.

Left to do is simplify_node and simplify_rec, and some auxiliary methods.

Each commit message has a non-empty body, explaining why the change was made.
n/a Methods or procedures I have added are documented, following the guidelines provided in CODING_STANDARD.md.
-n/a The feature or user visible behaviour I have added or modified has been documented in the User Guide in doc/cprover-manual/
n/a Regression or unit tests are included, or existing tests cover the modified code (in this case I have detailed which ones those are in the commit message).
n/a My commit message includes data points confirming performance improvements (if claimed).
My PR is restricted to a single feature or bugfix.
n/a White-space or formatting changes outside the feature-related changed lines are in commits of their own.

allredj

✔️
Passed Diffblue compatibility checks (cbmc commit: 6163a70).
Build URL: https://travis-ci.com/diffblue/test-gen/builds/118008202

codecov-io · 2019-07-04T18:14:27Z

Codecov Report

❗ No coverage uploaded for pull request base (develop@a941ba9). Click here to learn what that means.
The diff coverage is 68.57%.

@@            Coverage Diff             @@
##             develop    #4874   +/-   ##
==========================================
  Coverage           ?   69.19%           
==========================================
  Files              ?     1307           
  Lines              ?   107952           
  Branches           ?        0           
==========================================
  Hits               ?    74697           
  Misses             ?    33255           
  Partials           ?        0

Impacted Files	Coverage Δ
src/util/simplify_expr_class.h	`88.88% <ø> (ø)`
src/util/simplify_utils.cpp	`100% <ø> (ø)`
src/util/simplify_expr_boolean.cpp	`89.04% <100%> (ø)`
src/util/simplify_expr_if.cpp	`39.16% <39.16%> (ø)`
src/util/simplify_expr_array.cpp	`86.76% <75%> (ø)`
src/util/simplify_expr_pointer.cpp	`79.59% <76.92%> (ø)`
src/util/simplify_expr.cpp	`87.23% <80%> (ø)`
src/util/simplify_expr_struct.cpp	`85.71% <82.14%> (ø)`
src/util/simplify_expr_int.cpp	`81.05% <87.61%> (ø)`

Continue to review full report at Codecov.

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allredj

✔️
Passed Diffblue compatibility checks (cbmc commit: f1e14a8).
Build URL: https://travis-ci.com/diffblue/test-gen/builds/118066179

allredj

✔️
Passed Diffblue compatibility checks (cbmc commit: 7e5fb17).
Build URL: https://travis-ci.com/diffblue/test-gen/builds/118194547

allredj

⚠️
This PR failed Diffblue compatibility checks (cbmc commit: f9e72a5).
Build URL: https://travis-ci.com/diffblue/test-gen/builds/118196021
Status will be re-evaluated on next push.
Common spurious failures include: the cbmc commit has disappeared in the mean time (e.g. in a force-push); the author is not in the list of contributors (e.g. first-time contributors); compatibility was already broken by an earlier merge.

allredj

✔️
Passed Diffblue compatibility checks (cbmc commit: aadd948).
Build URL: https://travis-ci.com/diffblue/test-gen/builds/118196970

tautschnig · 2019-07-12T14:42:05Z

I think this covers some of the comments I just posted on #4872, but actually the interfaces proposed here aren't as specific as could be. See comments in #4872 for more precise interfaces.

allredj

✔️
Passed Diffblue compatibility checks (cbmc commit: e6b904d).
Build URL: https://travis-ci.com/diffblue/test-gen/builds/119026152

allredj

✔️
Passed Diffblue compatibility checks (cbmc commit: b8bc1b8).
Build URL: https://travis-ci.com/diffblue/test-gen/builds/119026200

allredj

⚠️
This PR failed Diffblue compatibility checks (cbmc commit: f3bf107).
Build URL: https://travis-ci.com/diffblue/test-gen/builds/119026998
Status will be re-evaluated on next push.
Common spurious failures include: the cbmc commit has disappeared in the mean time (e.g. in a force-push); the author is not in the list of contributors (e.g. first-time contributors); compatibility was already broken by an earlier merge.

allredj

✔️
Passed Diffblue compatibility checks (cbmc commit: 27b0fda).
Build URL: https://travis-ci.com/diffblue/test-gen/builds/119027357

allredj

✔️
Passed Diffblue compatibility checks (cbmc commit: c5d779c).
Build URL: https://travis-ci.com/diffblue/test-gen/builds/119027533

tautschnig · 2019-07-13T15:18:57Z

@kroening #4872 is merged, and thus this one now needs a rebase.

Expressions should not be given a type() child if they don't have one.

This improves type safety.

These have tight coupling, and there is a sufficient number of them.

allredj

✔️
Passed Diffblue compatibility checks (cbmc commit: cb9dbc4).
Build URL: https://travis-ci.com/diffblue/test-gen/builds/119040141

tautschnig

Overall looks good, except for a couple of bugs where a changed(...) is missing - see detailed comments.

tautschnig · 2019-07-13T22:18:39Z

src/util/simplify_expr_array.cpp

    {
      exprt tmp=index.op0().op0();
-      expr.op1()=tmp;
+      index = tmp;


I don't think tmp carries any value anymore.

tautschnig · 2019-07-13T22:18:49Z

src/util/simplify_expr_array.cpp

    {
      exprt tmp=index.op0().op1();
-      expr.op1()=tmp;
+      index = tmp;


Get rid of tmp

tautschnig · 2019-07-13T22:20:54Z

src/util/simplify_expr_array.cpp

      if_exprt if_expr(equality_expr, with_expr.new_value(), new_index_expr);
-      expr = simplify_if(if_expr).expr;
-      return false;
+      return simplify_if(if_expr).expr;


It might not make much of a difference, but elsewhere we seem to use return changed(simplify_if(if_expr));

tautschnig · 2019-07-13T22:23:21Z

src/util/simplify_expr_int.cpp

-    return simplify_inequality(expr);
+    auto new_expr = expr;
+    new_expr.op0().swap(new_expr.op1());
+    return simplify_inequality(new_expr); // recursive call


return changed(simplify_inequality(new_expr));

tautschnig · 2019-07-13T22:24:40Z

src/util/simplify_expr_struct.cpp

+      auto new_member_expr = expr;
+      new_member_expr.op0() = new_operands.front();
+      // do this recursively
+      return simplify_member(new_member_expr);


return changed(simplify_member(new_member_expr));

tautschnig · 2019-07-13T22:25:09Z

src/util/simplify_expr_struct.cpp

-      return false;
+      auto new_expr = expr;
+      new_expr.op0() = op.op0();
+      return simplify_member(new_expr);


return changed(simplify_member(new_expr));

tautschnig · 2019-07-13T22:30:30Z

src/util/simplify_expr.cpp

+simplify_exprt::resultt<> simplify_exprt::simplify_sign(const sign_exprt &expr)
 {
  if(expr.operands().size()!=1)
    return unchanged(expr);


I don't think this should be necessary anymore.

tautschnig · 2019-07-13T22:31:02Z

src/util/simplify_expr_int.cpp

+simplify_exprt::resultt<>
+simplify_exprt::simplify_extractbit(const extractbit_exprt &expr)
 {
  PRECONDITION(expr.id() == ID_extractbit);


No longer necessary.

tautschnig · 2019-07-13T22:33:29Z

src/util/simplify_expr_struct.cpp

    to_member_expr(expr).get_component_name();

-  const exprt &op = expr.op0();
+  const exprt &op = expr.struct_op();


Use .compound(), struct_op carries a comment that "it will go away" (repeats below)

src/util/simplify_expr.cpp

This improves type safety.

This improves memory safety.

This improves type safety.

Follow-up from comment in #4872. The call is a no-op.

This improves type safety.

allredj

✔️
Passed Diffblue compatibility checks (cbmc commit: 412754c).
Build URL: https://travis-ci.com/diffblue/test-gen/builds/119063508

kroening added the cleanup label Jul 4, 2019

kroening requested review from peterschrammel, pkesseli, smowton and tautschnig as code owners July 4, 2019 16:03

kroening force-pushed the simplifier_new_interface3 branch 3 times, most recently from f825da3 to 6163a70 Compare July 4, 2019 17:21

allredj reviewed Jul 4, 2019

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kroening force-pushed the simplifier_new_interface3 branch from acbd1ad to f1e14a8 Compare July 5, 2019 09:00

allredj reviewed Jul 5, 2019

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allredj reviewed Jul 7, 2019

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kroening force-pushed the simplifier_new_interface3 branch from f9e72a5 to aadd948 Compare July 7, 2019 13:02

allredj reviewed Jul 7, 2019

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tautschnig assigned kroening Jul 12, 2019

This was referenced Jul 13, 2019

simplifier: use new interface #4872

Merged

simplifier: eliminate casts from bool to number #4904

Merged

kroening assigned tautschnig and unassigned kroening Jul 13, 2019

kroening force-pushed the simplifier_new_interface3 branch from f3bf107 to c5d779c Compare July 13, 2019 11:57

allredj reviewed Jul 13, 2019

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tautschnig removed their assignment Jul 13, 2019

tautschnig added the blocker label Jul 13, 2019

kroening added 5 commits July 13, 2019 14:53

simplifier: use new interface

eda7601

simplifier: prevent spurious adding of type

ef6cceb

Expressions should not be given a type() child if they don't have one.

simplifier: simplify_rec has new interface

a7a20a4

This improves type safety.

simplifier: move if_expr related methods into separate file

5295cb7

These have tight coupling, and there is a sufficient number of them.

simplify_expr_if: result -> nochange

37b642c

kroening force-pushed the simplifier_new_interface3 branch from c5d779c to cb9dbc4 Compare July 13, 2019 18:54

kroening removed the Needs rebase label Jul 13, 2019

allredj reviewed Jul 13, 2019

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tautschnig requested changes Jul 13, 2019

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kroening added 13 commits July 14, 2019 07:58

simplify_inequality_* methods use new interface

5d180cb

This improves type safety.

type simplify_sign

db75bb7

This improves memory safety.

type simplify_extractbit

b42d47d

This improves memory safety.

type simplify_bitnot

866acc9

This improves memory safety.

type simplify_not

d061aaa

This improves memory safety.

type simplify_index

1d53296

This improves memory safety.

type simplify_member

7fe4561

This improves memory safety.

type simplify_unary_minus

fddeaf9

This improves memory safety.

simplifier: type remaining methods for unary expressions

be1f6fa

This improves memory safety.

type simplify_concatenation

488e4ef

This improves type safety.

type simplify_unary_plus

2099dfe

This improves type safety.

removed unneeded call to simplify_node in simplify_boolean

16e18d2

Follow-up from comment in #4872. The call is a no-op.

improved typing in simplify_boolean

412754c

This improves type safety.

kroening assigned tautschnig and unassigned kroening Jul 14, 2019

kroening force-pushed the simplifier_new_interface3 branch from cb9dbc4 to 412754c Compare July 14, 2019 11:59

allredj reviewed Jul 14, 2019

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tautschnig approved these changes Jul 14, 2019

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tautschnig merged commit 250b140 into develop Jul 14, 2019

tautschnig deleted the simplifier_new_interface3 branch July 14, 2019 14:11

Simplifier: new interface, final piece [blocks: #4904] #4874

Simplifier: new interface, final piece [blocks: #4904] #4874

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kroening commented Jul 4, 2019 •

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