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defensive: when the machine fails during an internal call, try getting the environment and control in a good state.

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This commit is contained in:
Danny Yoo 2011-12-09 22:59:15 -05:00
parent bc5204f28e
commit 1baa212d02
1 changed files with 5 additions and 1 deletions
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6
js-assembler/runtime-src/baselib-functions.js
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@ -236,7 +236,7 @@
}
var i;
var oldArgcount, oldVal, oldProc, oldErrorHandler;
var oldArgcount, oldVal, oldProc, oldErrorHandler, oldControlLength, oldEnvLength;
if (! baselib.arity.isArityMatching(proc.racketArity, args.length - 4)) {
var msg = baselib.format.format("arity mismatch: ~s expected ~s arguments, but received ~s",
[proc.displayName, proc.racketArity, args.length - 4]);
@ -256,6 +256,8 @@
oldVal = MACHINE.v;
oldArgcount = MACHINE.a;
oldProc = MACHINE.p;
oldControlLength = MACHINE.c.length;
oldEnvLength = MACHINE.e.length;
oldErrorHandler = MACHINE.params['currentErrorHandler'];
var afterGoodInvoke = function (MACHINE) {
@ -295,6 +297,8 @@
MACHINE.v = oldVal;
MACHINE.a = oldArgcount;
MACHINE.p = oldProc;
MACHINE.c.length = oldControlLength;
MACHINE.e.length = oldEnvLength;
fail(e);
};
MACHINE._trampoline(proc.label,