Ignore:
Timestamp:
Jul 29, 2020, 11:29:01 PM (15 months ago)
Author:
Michael Brooks <mlbrooks@…>
Branches:
arm-eh, jacob/cs343-translation, master, new-ast, new-ast-unique-expr
Children:
0c760db
Parents:
1d17939
Message:

Fix bug where pointer and reference types allow unsound initialization and return. Fixes #189

There are two instances of the same basic change, which is using conversionCost instead of castCost for resolving...
A: an InitExpr?, always; affects variable initializations
B: a CastExpr?, for type-system-generated casts only; affects function returns

Changing the behaviour of the typechecker on initialization (do A) and cast (do B):
src/ResolvExpr/AlternativeFinder.cc
src/SynTree/Expression.h
testsinit1.*

Making type of string literal consistent with how C defines it (accommodate A):
src/Parser/ExpressionNode.cc

Making type system happy with incumbent use of void* (accommodate A):
libcfa/src/concurrency/kernel.cfa
libcfa/src/containers/list.hfa
tests/bugs/66.cfa
tests/avltree/avl1.cfa
tests/concurrent/signal/block.cfa
tests/searchsort.cfa

Making type system happy with incumbent plan-9 downcast (accommodate B):
libcfa/src/containers/list.hfa

Fixing previously incorrect constness of declarations (accommodate A):
tests/exceptions/defaults.cfa
libcfa/src/iostream.hfa

Fixing previously incorrect isGenerated classification of casts that desugaring introduces (accommodate B):
src/Concurrency/Keywords.cc
src/Concurrency/Waitfor.cc

Working around trac #207 (revealed by A):
tests/io2.cfa

Working around trac #208 (speculatively created by B):
libcfa/src/bits/locks.hfa
libcfa/src/concurrency/preemption.cfa

Misc:
tests/exceptions/conditional.cfa (accommodate A)

a _msg function for an exception was declared with wrong return type, so it was not compatible for assignment into the vtable instance

libcfa/src/stdlib.hfa

the compiler now prohibits a prior attempt to call a nonexistent realloc overload; calling alloc_align in its place

File:
1 edited

Legend:

Unmodified
Added
Removed
  • src/ResolvExpr/AlternativeFinder.cc

    r1d17939 rb81fd95  
    12161216                        unify( castExpr->result, alt.expr->result, alt.env, needAssertions,
    12171217                                haveAssertions, openVars, indexer );
    1218                         Cost thisCost = castCost( alt.expr->result, castExpr->result, alt.expr->get_lvalue(),
    1219                                 indexer, alt.env );
     1218                        Cost thisCost =
     1219                                castExpr->isGenerated
     1220                                ? conversionCost( alt.expr->result, castExpr->result, alt.expr->get_lvalue(),   indexer, alt.env )
     1221                                : castCost( alt.expr->result, castExpr->result, alt.expr->get_lvalue(), indexer, alt.env );
    12201222                        PRINT(
    12211223                                std::cerr << "working on cast with result: " << castExpr->result << std::endl;
     
    16981700
    16991701                                // unification run for side-effects
    1700                                 unify( toType, alt.expr->result, newEnv, need, have, openVars, indexer );
     1702                                bool canUnify = unify( toType, alt.expr->result, newEnv, need, have, openVars, indexer );
     1703                                (void) canUnify;
    17011704                                // xxx - do some inspecting on this line... why isn't result bound to initAlt.type?
    17021705
    1703                                 Cost thisCost = castCost( alt.expr->result, toType, alt.expr->get_lvalue(),
     1706                                Cost thisCost = computeConversionCost( alt.expr->result, toType, alt.expr->get_lvalue(),
    17041707                                        indexer, newEnv );
     1708
     1709                                PRINT(
     1710                                        Cost legacyCost = castCost( alt.expr->result, toType, alt.expr->get_lvalue(),
     1711                                                indexer, newEnv );
     1712                                        std::cerr << "Considering initialization:";
     1713                                        std::cerr << std::endl << "  FROM: "; alt.expr->result->print(std::cerr);
     1714                                        std::cerr << std::endl << "  TO: ";   toType          ->print(std::cerr);
     1715                                        std::cerr << std::endl << "  Unification " << (canUnify ? "succeeded" : "failed");
     1716                                        std::cerr << std::endl << "  Legacy cost " << legacyCost;
     1717                                        std::cerr << std::endl << "  New cost " << thisCost;
     1718                                        std::cerr << std::endl;
     1719                                )
     1720                               
    17051721                                if ( thisCost != Cost::infinity ) {
    17061722                                        // count one safe conversion for each value that is thrown away
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