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author | Matthew Pickering <matthewtpickering@gmail.com> | 2020-11-18 11:36:07 +0000 |
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committer | Matthew Pickering <matthewtpickering@gmail.com> | 2021-03-03 19:09:34 +0000 |
commit | 4b297979d25740d31241a9000e36068db112545a (patch) | |
tree | e2e40fa7922fb4a91125c73fcbae04e7a6a66f73 /compiler/GHC/Unit/Module/Name.hs | |
parent | 8402ea951b31e01a925ca691747d1757eaf31fcc (diff) | |
download | haskell-4b297979d25740d31241a9000e36068db112545a.tar.gz |
Add -finfo-table-map which maps info tables to source positions
This new flag embeds a lookup table from the address of an info table
to information about that info table.
The main interface for consulting the map is the `lookupIPE` C function
> InfoProvEnt * lookupIPE(StgInfoTable *info)
The `InfoProvEnt` has the following structure:
> typedef struct InfoProv_{
> char * table_name;
> char * closure_desc;
> char * ty_desc;
> char * label;
> char * module;
> char * srcloc;
> } InfoProv;
>
> typedef struct InfoProvEnt_ {
> StgInfoTable * info;
> InfoProv prov;
> struct InfoProvEnt_ *link;
> } InfoProvEnt;
The source positions are approximated in a similar way to the source
positions for DWARF debugging information. They are only approximate but
in our experience provide a good enough hint about where the problem
might be. It is therefore recommended to use this flag in conjunction
with `-g<n>` for more accurate locations.
The lookup table is also emitted into the eventlog when it is available
as it is intended to be used with the `-hi` profiling mode.
Using this flag will significantly increase the size of the resulting
object file but only by a factor of 2-3x in our experience.
Diffstat (limited to 'compiler/GHC/Unit/Module/Name.hs')
-rw-r--r-- | compiler/GHC/Unit/Module/Name.hs | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/compiler/GHC/Unit/Module/Name.hs b/compiler/GHC/Unit/Module/Name.hs index 76c40f6a87..cc5e430bd6 100644 --- a/compiler/GHC/Unit/Module/Name.hs +++ b/compiler/GHC/Unit/Module/Name.hs @@ -30,7 +30,7 @@ import Text.ParserCombinators.ReadP (ReadP) import Data.Char (isAlphaNum) -- | A ModuleName is essentially a simple string, e.g. @Data.List@. -newtype ModuleName = ModuleName FastString +newtype ModuleName = ModuleName FastString deriving Show instance Uniquable ModuleName where getUnique (ModuleName nm) = getUnique nm |