Fix compiler assert about bounds expression already existing. #537
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The children() method for iterating over chidren of AST cast expressions was incorrectly including compiler-generated bounds expressions. Child AST nodes should be nodes that appear in the source program and additional information shouldn't be treated as child nodes. There were complex IR invariants about when a bounds expression stored within a cast expression was child AST node or not. This change fixes the bug and simplifies the AST invariants. This fixes issue #526. for cast expressions, there is now one entry for bounds expressions declared as part of the program. There are separate nodes for normalized bounds and inferred bounds. Testing: - Added a new regression test case for the failing case. - Passes existing Checked C and clang Checked C tests.
Prabhuk
approved these changes
Jul 31, 2018
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The children() method for iterating over chidren of AST cast expressions
was incorrectly including compiler-generated bounds expressions. Child AST
nodes should be nodes that appear in the source program and additional
information shouldn't be treated as child nodes. There were
complex IR invariants about when a bounds expression stored within a cast
expression was child AST node or not.
This change fixes the bug and simplifies the AST invariants. This fixes
issue #526. for cast expressions, there is now one entry for bounds expressions
declared as part of the program. There are separate nodes for normalized
bounds and inferred bounds.
Testing: