Chandler Carruth ad74725ab5 Enhance the CFG construction to detect no-return destructors for ... temporary objects and local variables. When detected, these split the block, marking the new one as having only the exit block as a successor. This prevents a large number of false positives in warnings sensitive to no-return constructs such as -Wreturn-type, and fixes the remainder of PR10063 along with several variations of this bug that had not been reported. The test cases are extended across the board to cover these patterns. This also checks in a stress test for these types of CFGs. The stress test declares some 32k variables, a mixture of no-return and normal destructors. Previously, this resulted in roughly 2500 CFG blocks, but didn't model any of the no-return destructors. With this patch, it results in over 33k blocks, many of them now unreachable. The nice thing about how the analyzer is set up? This causes *no* regression in performance of building the CFG. It actually in some cases makes it faster, as best I can benchmark. The analysis for -Wreturn-type (and any other that cares about no-return code paths) is technically slower now as it has to look at many more candidate blocks, but it computes the correct answer. I have more test cases to follow, I think they all work now. Also I have further work that should dramatically simplify analyses in the presence of no-return. llvm-svn: 139586		2011-09-13 06:09:01 +00:00
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all-std-headers.cpp
c99-intconst-1.c
carbon_h.c
cfg-big-switch.c
cfg-long-chain1.c
cfg-long-chain2.c
cfg-long-chain3.c
cfg-nested-switches.c
cfg-nested-var-scopes.cpp	Enhance the CFG construction to detect no-return destructors for	2011-09-13 06:09:01 +00:00
Cocoa_h.m
iostream.cc
macro_pounder_fn.c
macro_pounder_obj.c
stpcpy-test.c