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Author SHA1 Message Date
Santiago Pastorino
250a636217
Avoid copying some undef memory in MIR 
During MIR interpretation it may happen that a place containing
uninitialized bytes is copied. This would read the current
representation of these bytes and write it to the destination even
though they must, by definition, not matter to the execution.

This elides that representation change when no bytes are defined in such
a copy, saving some cpu cycles. In such a case, the memory of the target
allocation is not touched at all which also means that sometimes no
physical page backing the memory allocation of the representation needs
to be provided by the OS at all, reducing memory pressure on the system.
 2019-12-28 14:13:44 -03:00
Santiago Pastorino
bd93b7718e
Avoid memory copy logic for zsts 
Closes #67539
 2019-12-27 09:33:22 -03:00
bors
8f5f8f916f Auto merge of #67192 - oli-obk:const_zst_addr, r=RalfJung,varkor 
Various const eval and pattern matching ICE fixes

r? @RalfJung
cc @spastorino

This PR does not change existing behaviour anymore and just fixes a bunch of ICEs reachable from user code (sometimes even on stable via obscure union transmutes).
 2019-12-27 07:38:52 +00:00
bors
a04c789f69 Auto merge of #66936 - cjgillot:hirene-expr, r=Zoxc 
Allocate HIR on an arena 2/4 -- Expr & Pat

This is the second PR in the series started by #66931

This time, commits don't really make sense on their own.
They are mostly split by type of compile error.

The additional diff is here: https://github.com/cjgillot/rust/compare/hirene-preamble...hirene-expr
 2019-12-27 01:40:41 +00:00
Camille GILLOT
fb100e5ddc Move arena_vec inside lowering. 2019-12-26 23:40:50 +01:00
Camille GILLOT
75632c5ffe Remove some type information. 2019-12-26 23:40:13 +01:00
Camille GILLOT
1984ec5d20 Fewer calls to arena.alloc. 2019-12-26 23:39:14 +01:00
Camille GILLOT
8284035372 Fallout in other crates. 2019-12-26 23:38:46 +01:00
Camille GILLOT
58b908d09c Lowering for hir::Expr. 2019-12-26 23:36:12 +01:00
Camille GILLOT
52e9825ba8 Visit for hir::Expr. 2019-12-26 23:36:12 +01:00
Camille GILLOT
2b1cfe5b5b Syntax for hir::Expr. 2019-12-26 23:36:12 +01:00
Oliver Scherer
f65a91eb47 Make ui test bitwidth independent 2019-12-26 22:50:18 +01:00
Oliver Scherer
12a4c2ca18 Fix rebase fallout 2019-12-26 22:50:18 +01:00
Oliver Scherer
aaffe12453 Use the targetted const eval functions 2019-12-26 22:50:18 +01:00
Oliver Scherer
b476344ccc Reintroduce the recursion comment 2019-12-26 22:50:18 +01:00
Oliver Scherer
1531c3937b Documentation nit 2019-12-26 22:50:18 +01:00
Oliver Scherer
20c1b3fb49 Add a const_eval helper to InterpCx 2019-12-26 22:50:18 +01:00
Oliver Scherer
1acbf4b802 Early abort instead of building up zero sized values 2019-12-26 22:50:18 +01:00
Oliver Scherer
95205518dd Explain why const_eval is ok here 2019-12-26 22:50:17 +01:00
Oliver Scherer
0e3fafaea7 Typo 2019-12-26 22:50:17 +01:00
Oliver Scherer
72ebce0e1b Remove unintended noisy log statement 2019-12-26 22:50:17 +01:00
Oliver Scherer
6937ca2c90 Explain the currently necessary existance of TransmuteSizeDiff 2019-12-26 22:50:17 +01:00
Oliver Scherer
cb8d1c3c65 Explain what we are doing with parameter environments for statics 2019-12-26 22:50:17 +01:00
Oliver Scherer
8a88ff1006 Comments should start capitalized and end in a period 2019-12-26 22:50:17 +01:00
Oliver Scherer
41d58185dd Explain ParamEnv::reveal_all usage 2019-12-26 22:50:17 +01:00
Oliver Scherer
6b651b1a88 Add regression test for ZST statics being allowed to "read" from themselves 2019-12-26 22:50:17 +01:00
Oliver Scherer
a7a011d2fa Immediately evaluate and validate constants when we want them as operands 2019-12-26 22:50:17 +01:00
Oliver Scherer
0e969b73f6 Interning even happens when validation of a constant fails 2019-12-26 22:50:17 +01:00
Oliver Scherer
a0bd1a695d Prevent an ICE on invalid transmutes 2019-12-26 22:50:16 +01:00
Oliver Scherer
13694de4a2 Comment on a few odd things that we should look at 2019-12-26 22:50:16 +01:00
Oliver Scherer
bb1ecee5b6 Simplify force_allocation_maybe_sized 2019-12-26 22:50:16 +01:00
Oliver Scherer
b5b5258d74 Retire to_ptr which should already have no users but still kept getting new ones 2019-12-26 22:50:14 +01:00
Oliver Scherer
1e40681f50 Don't ICE on the use of integer addresses for ZST constants in pattern matching 2019-12-26 22:46:22 +01:00
bors
3e0a1c0910 Auto merge of #67592 - matthewjasper:cleanup-match, r=Centril 
Prepare for lowering or-patterns

This is probably best reviewed commit-by-commit.

* Rustfmt `rustc_mir::build::{self, matches}`
* Remove `-Znll-dont-emit-read-for-match`
* Split `match_expr` into smaller functions
* Feature gate or-patterns in const contexts

cc https://github.com/rust-lang/rust/issues/54883

r? @Centril
 2019-12-26 16:44:52 +00:00
bors
3ac40b69c7 Auto merge of #67327 - oli-obk:cleanup, r=RalfJung 
Split up `const_eval.rs`

Fixes #67316

r? @RalfJung
 2019-12-26 13:15:05 +00:00
Oliver Scherer
07df1479e5 Rebase fallout 2019-12-26 12:11:12 +01:00
Oliver Scherer
7d5f36a1e5 A cycle error on a diverging function is now a const stack overflow again 2019-12-26 12:11:12 +01:00
Oliver Scherer
2e66f85111 Bail out before running the query 2019-12-26 12:11:12 +01:00
Oliver Scherer
b97abd0761 Tidy 2019-12-26 12:11:12 +01:00
Oliver Scherer
49f5b0834b Fix imports after rebase 2019-12-26 12:11:12 +01:00
Oliver Scherer
d5f1d75dd2 Rename query module 2019-12-26 12:11:12 +01:00
Oliver Scherer
4ffdd9a16a Move function definitions before their first use 2019-12-26 12:11:12 +01:00
Oliver Scherer
e21d2c8f9b Move all functions used by the queries to query.rs 2019-12-26 12:11:12 +01:00
Oliver Scherer
43221a684d Move a function to make its adjacent impl block easier to discover 2019-12-26 12:11:11 +01:00
Oliver Scherer
eea51e3427 Make some functions crate local 2019-12-26 12:11:11 +01:00
Oliver Scherer
eda3fa9eb5 Move eval_body_using_ecx to the only module it is used in 2019-12-26 12:11:11 +01:00
Oliver Scherer
9a82458e70 Move eval_const_fn_call to the const_eval module 2019-12-26 12:11:11 +01:00
Oliver Scherer
2d67edd32c Move const eval query components into their own module 2019-12-26 12:11:11 +01:00
Oliver Scherer
3e7fa3c6f2 Move const eval machine into its own module 2019-12-26 12:10:36 +01:00
bors
acb6690e1d Auto merge of #66670 - crlf0710:normalize_ident, r=Dylan-DPC 
Normalize ident

Perform unicode normalization on identifiers. Resolving the first bullet point in #55467.
 2019-12-26 09:55:00 +00:00