X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=compiler%2Fmain%2FSysTools.lhs;h=3c465edd7386960e6dcfbc898b4fa201b0758931;hb=21dcb917858ecc6a851f05815ecd6a097e3b7a9d;hp=11e31b823474aa67a1d10b0010942daa49435fa1;hpb=9bcd5a09b7b57de8b7d6780fa7a767ff72049a7a;p=ghc-hetmet.git
diff --git a/compiler/main/SysTools.lhs b/compiler/main/SysTools.lhs
index 11e31b8..3c465ed 100644
--- a/compiler/main/SysTools.lhs
+++ b/compiler/main/SysTools.lhs
@@ -48,7 +48,7 @@ import Util
import DynFlags
import FiniteMap
-import Control.Exception
+import Exception
import Data.IORef
import Control.Monad
import System.Exit
@@ -74,24 +74,33 @@ import FastString
import SrcLoc ( SrcLoc, mkSrcLoc, noSrcSpan, mkSrcSpan )
\end{code}
+How GHC finds its files
+~~~~~~~~~~~~~~~~~~~~~~~
- The configuration story
- ~~~~~~~~~~~~~~~~~~~~~~~
+[Note topdir]
GHC needs various support files (library packages, RTS etc), plus
-various auxiliary programs (cp, gcc, etc). It finds these in one
-of two places:
+various auxiliary programs (cp, gcc, etc). It starts by finding topdir:
-* When running as an *installed program*, GHC finds most of this support
- stuff in the installed library tree. The path to this tree is passed
- to GHC via the -B flag, and given to initSysTools .
+ for "installed" topdir is the root of GHC's support files ($libdir)
+ for "in-place" topdir is the root of the build tree
-* When running *in-place* in a build tree, GHC finds most of this support
- stuff in the build tree. The path to the build tree is, again passed
- to GHC via -B.
+On Unix:
+ - ghc always has a shell wrapper that passes a -B
option
+ - in an installation, is $libdir
+ - in a build tree, is $TOP/inplace-datadir
+ - so we detect the build-tree case and add ".." to get us back to $TOP
-GHC tells which of the two is the case by seeing whether package.conf
-is in TopDir [installed] or in TopDir/ghc/driver [inplace] (what a hack).
+On Windows:
+ - ghc never has a shell wrapper.
+ - we can find the location of the ghc binary, which is
+ $topdir/bin/ghc.exe in an installation, or
+ $topdir/ghc/stage1-inplace/ghc.exe in a build tree.
+ - we detect which one of these we have, and calculate $topdir.
+
+
+from topdir we can find package.conf, which contains the locations of
+almost everything else, whether we're in a build tree or installed.
SysTools.initSysProgs figures out exactly where all the auxiliary programs
@@ -154,9 +163,7 @@ initSysTools :: Maybe String -- Maybe TopDir path (without the '-B' prefix)
initSysTools mbMinusB dflags0
= do { (am_installed, top_dir) <- findTopDir mbMinusB
- -- top_dir
- -- for "installed" this is the root of GHC's support files
- -- for "in-place" it is the root of the build tree
+ -- see [Note topdir]
-- NB: top_dir is assumed to be in standard Unix
-- format, '/' separated
@@ -202,7 +209,7 @@ initSysTools mbMinusB dflags0
-- Check that the package config exists
; config_exists <- doesFileExist pkgconfig_path
; when (not config_exists) $
- throwDyn (InstallationError
+ ghcError (InstallationError
("Can't find package.conf as " ++ pkgconfig_path))
-- On Windows, gcc and friends are distributed with GHC,
@@ -298,24 +305,6 @@ initSysTools mbMinusB dflags0
\end{code}
\begin{code}
--- Find TopDir
--- for "installed" this is the root of GHC's support files
--- for "in-place" it is the root of the build tree
---
--- Plan of action:
--- 1. Set proto_top_dir
--- if there is no given TopDir path, get the directory
--- where GHC is running (only on Windows)
---
--- 2. If package.conf exists in proto_top_dir, we are running
--- installed; and TopDir = proto_top_dir
---
--- 3. Otherwise we are running in-place, so
--- proto_top_dir will be /...stuff.../ghc/compiler
--- Set TopDir to /...stuff..., which is the root of the build tree
---
--- This is very gruesome indeed
-
findTopDir :: Maybe String -- Maybe TopDir path (without the '-B' prefix).
-> IO (Bool, -- True <=> am installed, False <=> in-place
String) -- TopDir (in Unix format '/' separated)
@@ -341,7 +330,7 @@ findTopDir mbMinusB
-> do maybe_exec_dir <- getBaseDir -- Get directory of executable
case maybe_exec_dir of -- (only works on Windows;
-- returns Nothing on Unix)
- Nothing -> throwDyn (InstallationError "missing -B option")
+ Nothing -> ghcError (InstallationError "missing -B option")
Just dir -> return dir
\end{code}
@@ -688,9 +677,9 @@ runSomethingFiltered dflags filter_fn phase_name pgm args mb_env = do
then return (ExitFailure 1, True)
else IO.ioError err)
case (doesn'tExist, exit_code) of
- (True, _) -> throwDyn (InstallationError ("could not execute: " ++ pgm))
+ (True, _) -> ghcError (InstallationError ("could not execute: " ++ pgm))
(_, ExitSuccess) -> return ()
- _ -> throwDyn (PhaseFailed phase_name exit_code)
+ _ -> ghcError (PhaseFailed phase_name exit_code)
builderMainLoop :: DynFlags -> (String -> String) -> FilePath
-> [String] -> Maybe [(String, String)]
@@ -828,7 +817,7 @@ traceCmd dflags phase_name cmd_line action
where
handle_exn _verb exn = do { debugTraceMsg dflags 2 (char '\n')
; debugTraceMsg dflags 2 (ptext (sLit "Failed:") <+> text cmd_line <+> text (show exn))
- ; throwDyn (PhaseFailed phase_name (ExitFailure 1)) }
+ ; ghcError (PhaseFailed phase_name (ExitFailure 1)) }
\end{code}
%************************************************************************