arithmetic-overflow checks during const-eval#23863

Merged

bors merged 16 commits intorust-lang:masterfrom pnkfelix:arith-oflo-const-eval

Apr 1, 2015

+1,727-261

Commits on Apr 1, 2015

Added type-specific overflow checks when computing enum discriminant values.
pnkfelix
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Added tests for discriminant overflows.
pnkfelix
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fix post rebase.
pnkfelix
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Fix rust-lang#23890 : const-eval _ as usize, _ as isize must dispatch to target type.
pnkfelix
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Added overflowing_{div,rem,shl,shr} method implementations to WrappingOps.
pnkfelix
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Refactored ty::ctxt so node_types mutations must go through ty methods.
pnkfelix
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ty.rs improve error feedback when const-eval errs during repeat count eval.
pnkfelix
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rust_llvm: Add way to reflectively ask if a ValueRef is a known constant int.
pnkfelix
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rustc::middle::const_eval : add overflow-checking for {+, -, *}.
pnkfelix
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rustc_trans::trans::consts add overflow checking
pnkfelix
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Fallout from changes for overflow-checking during constant evaluation.
pnkfelix
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Test cases for checking arithmetic overflow during const eval.
pnkfelix
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Include feature core to get access to wrapping_add.
pnkfelix
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Fixes to compile-fail error messages post-rebase.
pnkfelix
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Unify handling of checking repeat-count validity.
pnkfelix
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dealing with fallout to the tests, in particular diffs between 32- vs 64-bit targets.
pnkfelix
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