Functions that claim to return a struct but don't cause a crash

ID0002235: This issue was created automatically from Mantis Issue 2235. Further discussion may take place here.

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Id	Project	Category	View	Due Date	Updated
ID0002235	Frama-C	Kernel	public	2016-06-21	2017-05-31

Reporter	jrobbins	Assigned To	virgile	Resolution	fixed
Priority	normal	Severity	crash	Reproducibility	always
Platform	-	OS	-	OS Version	-
Product Version	Frama-C Aluminium	Target Version	-	Fixed in Version	Frama-C 15-Phosphorus

Description :

If a function returns a struct in its declaration, but it's method body does not return anything, Frama-C will warn about not finding a return value, and then crash.

While the kernel does warn you this is an issue, no invalid operation on the user's part should cause a crash. Instead, it should cause a user error.

Additional Information :

Tested with Aluminum on Linux 64-bit.

Steps To Reproduce :

== File bug.c:

struct s { int i; };

struct s foo() {}

== Run command:

frama-c bug.c

== Output:

[kernel] Parsing FRAMAC_SHARE/libc/__fc_builtin_for_normalization.i (no preprocessing) [kernel] Parsing bug.c (with preprocessing) bug2.c:5:[kernel] warning: Body of function foo falls-through and cannot find an appropriate return value bug2.c:5:[kernel] failure: Found return without value in function foo [kernel] Current source was: bug.c:5 The full backtrace is: Raised at file "src/kernel_services/plugin_entry_points/log.ml", line 583, characters 30-31 Called from file "src/kernel_services/plugin_entry_points/log.ml", line 577, characters 9-16 Re-raised at file "src/kernel_services/plugin_entry_points/log.ml", line 580, characters 15-16 Called from file "src/kernel_internals/typing/oneret.ml", line 246, characters 8-87 Called from file "src/kernel_internals/typing/oneret.ml", line 354, characters 22-54 Called from file "src/kernel_internals/typing/oneret.ml", line 361, characters 13-35 Called from file "src/kernel_services/ast_queries/file.ml", line 891, characters 6-26 Called from file "list.ml", line 73, characters 12-15 Called from file "src/kernel_services/ast_queries/file.ml", line 1143, characters 5-43 Called from file "src/kernel_services/ast_queries/file.ml", line 1579, characters 2-22 Called from file "src/kernel_services/ast_queries/file.ml", line 1666, characters 4-27 Called from file "src/kernel_services/ast_data/ast.ml", line 111, characters 2-28 Called from file "src/kernel_services/ast_data/ast.ml", line 123, characters 53-71 Called from file "src/kernel_internals/runtime/boot.ml", line 29, characters 6-20 Called from file "src/kernel_services/cmdline_parameters/cmdline.ml", line 787, characters 2-9 Called from file "src/kernel_services/cmdline_parameters/cmdline.ml", line 817, characters 18-64 Called from file "src/kernel_services/cmdline_parameters/cmdline.ml", line 228, characters 4-8

     Frama-C aborted: internal error.
     Please report as 'crash' at http://bts.frama-c.com/.
     Your Frama-C version is Aluminium-20160501.
     Note that a version and a backtrace alone often do not contain enough
     information to understand the bug. Guidelines for reporting bugs are at:
     http://bts.frama-c.com/dokuwiki/doku.php?id=mantis:frama-c:bug_reporting_guidelines