Use improved reporting for equality-without-matching-types #2110
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tautschnig
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I remember this being a problem and I remember someone saying "we should do something about this" but I don't recall the root cause. I don't really object to the code but I am concerned about what this says about the invariants and what is a correctly structured expression. I am under the impression that all exprts should be correctly typed and thus if anything (including symex) creates an equality of a mixed type, then it is wrong and we can't trust anything that happens after. This patch would seem to suggest otherwise... Can you explain a bit about why this is desireable? |
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This is really just a crutch. The fix is, as you say, to properly check for type consistency during symbolic execution and never feed inconsistent expressions to the back-end. Indeed I'd rather see us revert any of the work that has introduced elaborate exception handling, and I'd rather see this sooner than later... |
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As said elsewhere, all 'catch'es that do not provide operational recovery should be removed. All catch&exit logic should be moved to parse_optionst::main(). |
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@tautschnig if this is a crutch and in light of what @peterschrammel has said about recovery -- do we need this? Really isn't this an invariant? |
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@martin-cs It really depends on when #1880 gets resolved. I've done the small bit of work for this PR because once again I had run into the problem and thus needed a debugging tool. Should I have spent time towards resolving #1880? Possibly... |
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I'm actually merging this now, a revert should be fairly cheap. Fully agreed that this should be an invariant, but at the point where it currently fires there isn't sufficient diagnostic information as the problem is not currently tested for/caught earlier. #1880 will eventually come to the rescue. |
31ef182 Merge pull request diffblue#2208 from diffblue/cleanout-goto-programs 0e84d3e Merge pull request diffblue#2195 from smowton/smowton/feature/smarter-reachability-slicer c801126 Merge pull request diffblue#2209 from diffblue/travis-no-osx-g++ 3487bf7 Reachability slicer: mark reachable code more precisely 85e8451 Merge pull request diffblue#2066 from tautschnig/bv-endianness 5e5eafb Merge pull request diffblue#2191 from smowton/smowton/feature/java-fatal-assertions 8a68ab8 remove g++ build on OS X; this is identical to the clang++ build 48e5b25 Amend faulty long-string test 3f718ba Java: make null-pointer and similar checks fatal 821eb1d remove basic_blocks and goto_program_irep d87c2db Merge pull request diffblue#2203 from diffblue/typed-lookup d77dea3 strongly type the lookup() methods in namespacet 2382f27 Merge pull request diffblue#2193 from martin-cs/feature/correct-instruction-documentation c314272 Merge pull request diffblue#2181 from diffblue/format-expr-constants 514a0a5 Merge pull request diffblue#2167 from diffblue/parse_unwindset_options 0102452 move escape(s) to string_utils f1b6174 use unwindsett in goto-instrument dcc907a introduce unwindsett for unwinding limits 10aeae8 format_expr now does index, c_bool constants, string constants 92b92d6 Correct the documentation of ASSERT : it does not alter control flow. a11add8 Expand the documentation of the goto-program instructions. a06503b Merge pull request diffblue#2197 from tautschnig/fix-help 05e4bc3 Remove stray whitespace previously demanded by clang-format 3261f4d Fix help output of --generate-function-body-options 7c67b23 Merge pull request diffblue#2110 from tautschnig/type-mismatch-exception 18fb262 Merge pull request diffblue#2025 from tautschnig/stack-depth-fix 9191b6a Merge pull request diffblue#2199 from tautschnig/simplifier-typing f99e631 Merge pull request diffblue#2198 from tautschnig/fix-test-desc 1a79a11 stack depth instrumentation: __CPROVER_initialize may be empty a7690ba Merge pull request diffblue#2185 from smowton/smowton/fix/tolerate-ts18661-types fc02e8f Restore returns before writing the simplified binary 49333eb Make restore_returns handle simplified programs 46f7987 Fix perl regular expressioons in regression test descriptions 9fe432b Merge pull request diffblue#1899 from danpoe/sharing-map-catch-unit-tests 9cc6aae Merge pull request diffblue#2081 from hannes-steffenhagen-diffblue/floating_point_simplificiation da19abe Tolerate TS 18661 (_Float32 et al) types a055454 Try all rounding modes when domain is unknown 5f7bc15 Add float support to constant propagator domain 3dc2244 Move adjust_float_expressions to goto-programs 06d8bea Merge pull request diffblue#2187 from diffblue/move-convert-nondet 6d8c3fa Merge pull request diffblue#2189 from thk123/bugfix/json-parser-restart 2ad157f Merge pull request diffblue#2186 from smowton/smowton/fix/call-graph-uninit-field cd54ad7 Corrected state persistence in the json parser 4447be0 Fix uninitialised collect_callsites field in call_grapht ead0aa3 Merge pull request diffblue#2188 from smowton/smowton/fix/init-string-types-without-refine-strings 57988fc Fix String type initialisation when --refine-strings is not active 6a76aff Move convert_nondet to java_bytecode ac6eb21 Merge pull request diffblue#1858 from danpoe/dependence-graph-fix 10b8b09 Merge pull request diffblue#2011 from thomasspriggs/final_classes a154593 Merge pull request diffblue#2087 from danpoe/feature/small-map 7002909 More dependence graph tests 66263ea Make dependence graph merge() return true when abstract state changes 3aa6dca Control dependency computation fix a408423 Simplified state merging in the dependence graph 0315816 Merge pull request diffblue#2180 from thomasspriggs/json_id2string 8941567 Merge pull request diffblue#2124 from smowton/smowton/feature/fallback-function-provider cd04e70 JBMC: use simple method stubbing pass a6b2cda Add Java simple method stubbing pass ec1127c Lazy goto model: hook for driver program to replace or stub functions b6a4382 Remove `id2string` from inside calls to the `json_stringt` constructor. b673ebb Add storage of final modifier status of java classes in `java_class_typet`. a2ad909 Small map 808dade Provide suitable diagnostics for equality-without-matching-types 89cf6fe Throw appropriate exceptions when converting constraints 2ae66c2 Produce a proper error message when catching a std::runtime_error at top level e7b3ade Workaround for Visual Studio loss of CV qualifier bug 1f661f5 Move sharing map and sharing node unit tests to util 47463a3 Use std::size_t instead of unsigned in the sharing map 3e22217 Sharing map documentation e54f740 Fix sharing map compiler warnings bcc489c Move sharing map unit tests to catch 34114b8 Use a specialised endianness map for flattening git-subtree-dir: cbmc git-subtree-split: 31ef182
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