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104 Commits

Author SHA1 Message Date
Nick Lewycky 7e82055e88 Make adding nocapture a bit stronger. FreeInst is nocapture. Also, 
functions that don't write can't leak a pointer except through 
the return value, so a void readonly function is implicitly nocapture.

Test these, and add a test that verifies that f1 calling f2 with an 
otherwise dead pointer gets both of them marked nocapture.

llvm-svn: 61552
 2009-01-02 03:46:56 +00:00
Duncan Sands 8c03a123ce Add tests for two types of traps that escape analysis 
might one day fall into.

llvm-svn: 61549
 2009-01-02 00:55:51 +00:00
Duncan Sands 163848021b Look through phi nodes and select instructions when 
calculating nocapture attributes.

llvm-svn: 61535
 2008-12-31 20:21:34 +00:00
Duncan Sands 44c8cd97a5 Rename AddReadAttrs to FunctionAttrs, and teach it how 
to work out (in a very simplistic way) which function
arguments (pointer arguments only) are only dereferenced
and so do not escape.  Mark such arguments 'nocapture'.

llvm-svn: 61525
 2008-12-31 16:14:43 +00:00