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propagate constraints during copying #35
Description
Copying from one slot to another should add a copy of every constraint that
includes the RHS of the assignment to the copy postcondition (with the RHS
renamed, in the constraint, to the new LHS slot).
In other words:
let int x = 10;
let int y = 11;
check lt(x,y); // postcond = { lt(x,y) }
let int z = x; // postcond = { lt(x,y), lt(z,y) }
Unless some horrible complications arise that make this impossible, I believe
the current rules permit this propagation to work.
Activity
graydon commentedon Jan 27, 2011
Shifted to rustc
catamorphism commentedon Jul 9, 2011
Fixed in 182c413
Merge pull request rust-lang#35 from sfackler/socketpair
Merge pull request rust-lang#35 from mrhota/undoc_appendix
define FileMap; fix rust-lang#35
Fixes rust-lang#35: Code coverage fixes
Auto merge of rust-lang#118488 - andjo403:remove_deadlock, r=SparrowLii
Auto merge of rust-lang#118488 - andjo403:remove_deadlock, r=SparrowLii
Rollup merge of rust-lang#118488 - andjo403:remove_deadlock, r=Sparro…
Auto merge of rust-lang#118488 - andjo403:remove_deadlock, r=SparrowLii
Merge rust-lang#35
Merge rust-lang#35
Merge rust-lang#35
jsloan-red-button commentedon Apr 25, 2026
Phase 2b RCA update (2026-04-25): The bug pattern reported here ('LLVM SH4 tail-call-opt drops arg-setup across extern "C"') is not a tail-call-opt issue. Phase 2b SDAG capture identified the root cause as our own
SuperHFixupCallClobber.cpppost-PEI peephole pass.The pass walks backwards from each
JSR @rNlooking for aMOV32PCRthat defined$rNand, if it sees an intervening def of$rN(a 'clobber'), inserts a fresh$r1 = MOV32PCR <CPI>before the JSR and rewrites the JSR target to $r1. The flaw: it doesn't bail on intervening kills of $rN. If an unrelated MOV32PCR loaded a static-global address into $rN, that address was used+killed by an immediate consumer (e.g., another MOV32mr), and $rN was later reused as a legitimate JSR-target carrier (e.g.,$r0 = MOV32mrd $r14, 0for a stack-spilled fn-ptr), the pass mis-identifies the unrelated MOV32PCR as the JSR's source and rewrites the JSR target to load the unrelated global address.In the relibc_start_v1 main() call site this manifested as: $r5 silently aliased to *(&environ) (CSE-collapse against the prior environ load) and
JSR @r1jumping to literal &argv (.bss).Fix: bail when the backward walk sees a
killed $CallRegUSE — the kill flag marks the last use of the value held in CallReg from its previous def; any earlier MOV32PCR was meant for that consumer, not for the JSR. Lands in rustx-sh4 v4.4.63. Phase 2b artifacts:/var/tmp/sh4-issue18-phase2/. Arbiter contract #44.feat: support variadic (rust-lang#35)
Merge pull request rust-lang#35 from makai410/changes