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| author | Edward Z. Yang <ezyang@cs.stanford.edu> | 2014-08-06 11:55:06 +0100 |
|---|---|---|
| committer | Edward Z. Yang <ezyang@cs.stanford.edu> | 2014-08-07 13:39:23 +0100 |
| commit | 4855be0d0d1ac90f836a6fb54f4034f478e38fd8 (patch) | |
| tree | f733368b2b043c8ac3d28d63a6cdeece7ebb6afd /compiler/utils | |
| parent | 18ac546d8db93f170cdbc29da8b7118272b065e7 (diff) | |
| download | haskell-4855be0d0d1ac90f836a6fb54f4034f478e38fd8.tar.gz | |
Give the Unique generated by strings a tag '$', fixes #9413.
Summary:
Previously, we allocated uniques for strings starting at zero, which
means the tag bits in the unique are zero, which means that printing a
Unique for a string will start with a null byte. This is bad. So
instead, start our numbering with the tag byte as '$' (as in $tring).
This is hard coded so we don't have to worry about the optimizer
reducing the expression.
Signed-off-by: Edward Z. Yang <ezyang@cs.stanford.edu>
Test Plan: validate
Reviewers: hvr, simonmar, austin
Subscribers: simonmar, relrod, ezyang, carter
Differential Revision: https://phabricator.haskell.org/D123
GHC Trac Issues: #9413
Diffstat (limited to 'compiler/utils')
| -rw-r--r-- | compiler/utils/FastString.lhs | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/compiler/utils/FastString.lhs b/compiler/utils/FastString.lhs index 0396c02749..157e5f08b0 100644 --- a/compiler/utils/FastString.lhs +++ b/compiler/utils/FastString.lhs @@ -239,7 +239,7 @@ data FastStringTable = string_table :: FastStringTable {-# NOINLINE string_table #-} string_table = unsafePerformIO $ do - uid <- newIORef 0 + uid <- newIORef 603979776 -- ord '$' * 0x01000000 tab <- IO $ \s1# -> case newArray# hASH_TBL_SIZE_UNBOXED (panic "string_table") s1# of (# s2#, arr# #) -> (# s2#, FastStringTable uid arr# #) |