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authorEelco Dolstra <e.dolstra@tudelft.nl>2007-02-27T19·10+0000
committerEelco Dolstra <e.dolstra@tudelft.nl>2007-02-27T19·10+0000
commit044b6482c185ba8966d9d893b033d97d66b5f225 (patch)
tree34e9cf280317c4c44ea7300f2d05c6330279dc61 /src/libstore/local-store.cc
parentadce01a8d05ee21890a5be699a26f1835594cb5d (diff)
* Greatly reduced the amount of stack space used by the Nix expression
  evaluator.  This was important because the NixOS expressions started
  to hit 2 MB default stack size on Linux.

  GCC is really dumb about stack space: it just adds up all the local
  variables and temporaries of every scope into one huge stack frame.
  This is really bad for deeply recursive functions.  For instance,
  every `throw Error(format("error message"))' causes a format object
  of a few hundred bytes to be allocated on the stack.  As a result,
  every recursive call to evalExpr2() consumed 4680 bytes.  By
  splitting evalExpr2() and by moving the exception-throwing code out
  of the main functions, evalExpr2() now only consumes 40 bytes.
  Similar for evalExpr().

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