Keep an unoptimized duplicate of const fn around
This allows CTFE to reliably detect UB, as otherwise optimizations may hide UB.
This commit is contained in:
oli
oli
parent
8e4fe6647f
commit
cccd40f9b5
25 changed files with 312 additions and 112 deletions
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@ -24,41 +24,41 @@ fn main() -> () {
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}
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alloc0 (static: FOO, size: 8, align: 4) {
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╾─alloc23─╼ 03 00 00 00 │ ╾──╼....
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╾─alloc27─╼ 03 00 00 00 │ ╾──╼....
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}
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alloc23 (size: 48, align: 4) {
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0x00 │ 00 00 00 00 __ __ __ __ ╾─alloc8──╼ 00 00 00 00 │ ....░░░░╾──╼....
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0x10 │ 00 00 00 00 __ __ __ __ ╾─alloc13─╼ 02 00 00 00 │ ....░░░░╾──╼....
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0x20 │ 01 00 00 00 2a 00 00 00 ╾─alloc21─╼ 03 00 00 00 │ ....*...╾──╼....
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alloc27 (size: 48, align: 4) {
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0x00 │ 00 00 00 00 __ __ __ __ ╾─alloc12─╼ 00 00 00 00 │ ....░░░░╾──╼....
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0x10 │ 00 00 00 00 __ __ __ __ ╾─alloc17─╼ 02 00 00 00 │ ....░░░░╾──╼....
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0x20 │ 01 00 00 00 2a 00 00 00 ╾─alloc25─╼ 03 00 00 00 │ ....*...╾──╼....
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}
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alloc8 (size: 0, align: 4) {}
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alloc12 (size: 0, align: 4) {}
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alloc13 (size: 8, align: 4) {
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╾─alloc11─╼ ╾─alloc12─╼ │ ╾──╼╾──╼
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alloc17 (size: 8, align: 4) {
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╾─alloc15─╼ ╾─alloc16─╼ │ ╾──╼╾──╼
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}
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alloc11 (size: 1, align: 1) {
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alloc15 (size: 1, align: 1) {
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05 │ .
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}
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alloc12 (size: 1, align: 1) {
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alloc16 (size: 1, align: 1) {
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06 │ .
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}
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alloc21 (size: 12, align: 4) {
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╾─a17+0x3─╼ ╾─alloc18─╼ ╾─a20+0x2─╼ │ ╾──╼╾──╼╾──╼
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alloc25 (size: 12, align: 4) {
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╾─a21+0x3─╼ ╾─alloc22─╼ ╾─a24+0x2─╼ │ ╾──╼╾──╼╾──╼
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}
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alloc17 (size: 4, align: 1) {
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alloc21 (size: 4, align: 1) {
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2a 45 15 6f │ *E.o
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}
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alloc18 (size: 1, align: 1) {
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alloc22 (size: 1, align: 1) {
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2a │ *
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}
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alloc20 (size: 4, align: 1) {
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alloc24 (size: 4, align: 1) {
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2a 45 15 6f │ *E.o
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}
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@ -24,44 +24,44 @@ fn main() -> () {
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}
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alloc0 (static: FOO, size: 16, align: 8) {
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╾───────alloc23───────╼ 03 00 00 00 00 00 00 00 │ ╾──────╼........
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╾───────alloc27───────╼ 03 00 00 00 00 00 00 00 │ ╾──────╼........
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}
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alloc23 (size: 72, align: 8) {
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0x00 │ 00 00 00 00 __ __ __ __ ╾───────alloc8────────╼ │ ....░░░░╾──────╼
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alloc27 (size: 72, align: 8) {
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0x00 │ 00 00 00 00 __ __ __ __ ╾───────alloc12───────╼ │ ....░░░░╾──────╼
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0x10 │ 00 00 00 00 00 00 00 00 00 00 00 00 __ __ __ __ │ ............░░░░
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0x20 │ ╾───────alloc13───────╼ 02 00 00 00 00 00 00 00 │ ╾──────╼........
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0x30 │ 01 00 00 00 2a 00 00 00 ╾───────alloc21───────╼ │ ....*...╾──────╼
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0x20 │ ╾───────alloc17───────╼ 02 00 00 00 00 00 00 00 │ ╾──────╼........
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0x30 │ 01 00 00 00 2a 00 00 00 ╾───────alloc25───────╼ │ ....*...╾──────╼
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0x40 │ 03 00 00 00 00 00 00 00 │ ........
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}
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alloc8 (size: 0, align: 8) {}
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alloc12 (size: 0, align: 8) {}
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alloc13 (size: 16, align: 8) {
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╾───────alloc11───────╼ ╾───────alloc12───────╼ │ ╾──────╼╾──────╼
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alloc17 (size: 16, align: 8) {
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╾───────alloc15───────╼ ╾───────alloc16───────╼ │ ╾──────╼╾──────╼
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}
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alloc11 (size: 1, align: 1) {
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alloc15 (size: 1, align: 1) {
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05 │ .
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}
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alloc12 (size: 1, align: 1) {
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alloc16 (size: 1, align: 1) {
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06 │ .
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}
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alloc21 (size: 24, align: 8) {
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0x00 │ ╾─────alloc17+0x3─────╼ ╾───────alloc18───────╼ │ ╾──────╼╾──────╼
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0x10 │ ╾─────alloc20+0x2─────╼ │ ╾──────╼
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alloc25 (size: 24, align: 8) {
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0x00 │ ╾─────alloc21+0x3─────╼ ╾───────alloc22───────╼ │ ╾──────╼╾──────╼
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0x10 │ ╾─────alloc24+0x2─────╼ │ ╾──────╼
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}
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alloc17 (size: 4, align: 1) {
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alloc21 (size: 4, align: 1) {
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2a 45 15 6f │ *E.o
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}
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alloc18 (size: 1, align: 1) {
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alloc22 (size: 1, align: 1) {
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2a │ *
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}
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alloc20 (size: 4, align: 1) {
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alloc24 (size: 4, align: 1) {
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2a 45 15 6f │ *E.o
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}
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@ -24,30 +24,30 @@ fn main() -> () {
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}
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alloc0 (static: FOO, size: 4, align: 4) {
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╾─alloc9──╼ │ ╾──╼
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╾─alloc10─╼ │ ╾──╼
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}
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alloc9 (size: 168, align: 1) {
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alloc10 (size: 168, align: 1) {
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0x00 │ ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab │ ................
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0x10 │ ab ab ab ab ab ab ab ab ab ab ab ab ╾─alloc4──╼ │ ............╾──╼
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0x10 │ ab ab ab ab ab ab ab ab ab ab ab ab ╾─alloc5──╼ │ ............╾──╼
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0x20 │ 01 ef cd ab 00 00 00 00 00 00 00 00 00 00 00 00 │ ................
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0x30 │ 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 │ ................
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0x40 │ 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 │ ................
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0x50 │ 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 │ ................
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0x60 │ 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 │ ................
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0x70 │ 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 │ ................
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0x80 │ 00 00 00 00 00 00 00 00 00 00 ╾─alloc6──╼ 00 00 │ ..........╾──╼..
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0x90 │ ╾─a7+0x63─╼ 00 00 00 00 00 00 00 00 00 00 00 00 │ ╾──╼............
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0x80 │ 00 00 00 00 00 00 00 00 00 00 ╾─alloc7──╼ 00 00 │ ..........╾──╼..
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0x90 │ ╾─a8+0x63─╼ 00 00 00 00 00 00 00 00 00 00 00 00 │ ╾──╼............
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0xa0 │ 00 00 00 00 00 00 00 00 │ ........
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}
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alloc4 (size: 4, align: 4) {
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alloc5 (size: 4, align: 4) {
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2a 00 00 00 │ *...
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}
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alloc6 (fn: main)
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alloc7 (fn: main)
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alloc7 (size: 100, align: 1) {
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alloc8 (size: 100, align: 1) {
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0x00 │ 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 │ ................
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0x10 │ 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 │ ................
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0x20 │ 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 │ ................
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@ -24,12 +24,12 @@ fn main() -> () {
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}
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alloc0 (static: FOO, size: 8, align: 8) {
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╾───────alloc9────────╼ │ ╾──────╼
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╾───────alloc10───────╼ │ ╾──────╼
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}
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alloc9 (size: 180, align: 1) {
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alloc10 (size: 180, align: 1) {
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0x00 │ ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab ab │ ................
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0x10 │ ab ab ab ab ab ab ab ab ab ab ab ab ╾──alloc4── │ ............╾───
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0x10 │ ab ab ab ab ab ab ab ab ab ab ab ab ╾──alloc5── │ ............╾───
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0x20 │ ──────────╼ 01 ef cd ab 00 00 00 00 00 00 00 00 │ ───╼............
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0x30 │ 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 │ ................
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0x40 │ 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 │ ................
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@ -37,18 +37,18 @@ alloc9 (size: 180, align: 1) {
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0x60 │ 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 │ ................
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0x70 │ 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 │ ................
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0x80 │ 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ╾──── │ ..............╾─
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0x90 │ ─────alloc6─────╼ 00 00 ╾─────alloc7+0x63─────╼ │ ─────╼..╾──────╼
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0x90 │ ─────alloc7─────╼ 00 00 ╾─────alloc8+0x63─────╼ │ ─────╼..╾──────╼
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0xa0 │ 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 │ ................
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0xb0 │ 00 00 00 00 │ ....
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}
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alloc4 (size: 4, align: 4) {
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alloc5 (size: 4, align: 4) {
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2a 00 00 00 │ *...
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}
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alloc6 (fn: main)
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alloc7 (fn: main)
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alloc7 (size: 100, align: 1) {
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alloc8 (size: 100, align: 1) {
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0x00 │ 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 │ ................
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0x10 │ 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 │ ................
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0x20 │ 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 │ ................
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@ -30,7 +30,7 @@ note: ...which requires const-evaluating + checking `<impl at $DIR/issue-24949-a
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LL | const BAR: u32 = IMPL_REF_BAR;
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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note: ...which requires optimizing MIR for `<impl at $DIR/issue-24949-assoc-const-static-recursion-impl.rs:11:1: 13:2>::BAR`...
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note: ...which requires caching mir for `<impl at $DIR/issue-24949-assoc-const-static-recursion-impl.rs:11:1: 13:2>::BAR` for CTFE...
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--> $DIR/issue-24949-assoc-const-static-recursion-impl.rs:12:5
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LL | const BAR: u32 = IMPL_REF_BAR;
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@ -30,7 +30,7 @@ note: ...which requires const-evaluating + checking `FooDefault::BAR`...
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LL | const BAR: u32 = DEFAULT_REF_BAR;
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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note: ...which requires optimizing MIR for `FooDefault::BAR`...
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note: ...which requires caching mir for `FooDefault::BAR` for CTFE...
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--> $DIR/issue-24949-assoc-const-static-recursion-trait-default.rs:8:5
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LL | const BAR: u32 = DEFAULT_REF_BAR;
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@ -30,7 +30,7 @@ note: ...which requires const-evaluating + checking `<impl at $DIR/issue-24949-a
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LL | const BAR: u32 = TRAIT_REF_BAR;
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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note: ...which requires optimizing MIR for `<impl at $DIR/issue-24949-assoc-const-static-recursion-trait.rs:11:1: 13:2>::BAR`...
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note: ...which requires caching mir for `<impl at $DIR/issue-24949-assoc-const-static-recursion-trait.rs:11:1: 13:2>::BAR` for CTFE...
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--> $DIR/issue-24949-assoc-const-static-recursion-trait.rs:12:5
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LL | const BAR: u32 = TRAIT_REF_BAR;
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@ -7,13 +7,13 @@ LL | const NULL_PTR: NonNull<u8> = unsafe { mem::transmute(0usize) };
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= note: The rules on what exactly is undefined behavior aren't clear, so this check might be overzealous. Please open an issue on the rustc repository if you believe it should not be considered undefined behavior.
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error: any use of this value will cause an error
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--> $DIR/ub-nonnull.rs:18:29
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--> $DIR/ub-nonnull.rs:18:30
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LL | / const OUT_OF_BOUNDS_PTR: NonNull<u8> = { unsafe {
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LL | | let ptr: &[u8; 256] = mem::transmute(&0u8); // &0 gets promoted so it does not dangle
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LL | | // Use address-of-element for pointer arithmetic. This could wrap around to NULL!
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LL | | let out_of_bounds_ptr = &ptr[255];
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| | ^^^^^^^^^ memory access failed: pointer must be in-bounds at offset 256, but is outside bounds of alloc10 which has size 1
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| | ^^^^^^^^ memory access failed: pointer must be in-bounds at offset 256, but is outside bounds of alloc10 which has size 1
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LL | | mem::transmute(out_of_bounds_ptr)
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LL | | } };
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| |____-
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@ -95,22 +95,26 @@ const RAW_SLICE_LENGTH_UNINIT: *const [u8] = unsafe {
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// # trait object
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// bad trait object
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#[warn(const_err)]
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const TRAIT_OBJ_SHORT_VTABLE_1: &dyn Trait = unsafe { mem::transmute((&92u8, &3u8)) };
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//~^ ERROR it is undefined behavior to use this value
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//~^ WARN any use of this value will cause an error [const_err]
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// bad trait object
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#[warn(const_err)]
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const TRAIT_OBJ_SHORT_VTABLE_2: &dyn Trait = unsafe { mem::transmute((&92u8, &3u64)) };
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//~^ ERROR it is undefined behavior to use this value
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//~^ WARN any use of this value will cause an error [const_err]
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// bad trait object
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#[warn(const_err)]
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const TRAIT_OBJ_INT_VTABLE: &dyn Trait = unsafe { mem::transmute((&92u8, 4usize)) };
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//~^ ERROR it is undefined behavior to use this value
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//~^ WARN any use of this value will cause an error [const_err]
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const TRAIT_OBJ_UNALIGNED_VTABLE: &dyn Trait = unsafe { mem::transmute((&92u8, &[0u8; 128])) };
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//~^ ERROR it is undefined behavior to use this value
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const TRAIT_OBJ_BAD_DROP_FN_NULL: &dyn Trait = unsafe { mem::transmute((&92u8, &[0usize; 8])) };
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//~^ ERROR it is undefined behavior to use this value
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const TRAIT_OBJ_BAD_DROP_FN_INT: &dyn Trait = unsafe { mem::transmute((&92u8, &[1usize; 8])) };
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//~^ ERROR it is undefined behavior to use this value
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#[warn(const_err)]
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const TRAIT_OBJ_BAD_DROP_FN_NOT_FN_PTR: &dyn Trait = unsafe { mem::transmute((&92u8, &[&42u8; 8])) };
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//~^ ERROR it is undefined behavior to use this value
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//~^ WARN any use of this value will cause an error [const_err]
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// bad data *inside* the trait object
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const TRAIT_OBJ_CONTENT_INVALID: &dyn Trait = unsafe { mem::transmute::<_, &bool>(&3u8) };
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@ -134,32 +134,50 @@ LL | | };
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= note: The rules on what exactly is undefined behavior aren't clear, so this check might be overzealous. Please open an issue on the rustc repository if you believe it should not be considered undefined behavior.
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error[E0080]: it is undefined behavior to use this value
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--> $DIR/ub-wide-ptr.rs:98:1
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warning: any use of this value will cause an error
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--> $DIR/ub-wide-ptr.rs:99:55
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LL | const TRAIT_OBJ_SHORT_VTABLE_1: &dyn Trait = unsafe { mem::transmute((&92u8, &3u8)) };
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed: encountered too small vtable
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| ------------------------------------------------------^^^^^^^^^^^^^^^^^^^^^^^^^^^^^---
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| |
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| memory access failed: pointer must be in-bounds at offset N, but is outside bounds of allocN which has size N
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|
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= note: The rules on what exactly is undefined behavior aren't clear, so this check might be overzealous. Please open an issue on the rustc repository if you believe it should not be considered undefined behavior.
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note: the lint level is defined here
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--> $DIR/ub-wide-ptr.rs:98:8
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LL | #[warn(const_err)]
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| ^^^^^^^^^
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error[E0080]: it is undefined behavior to use this value
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--> $DIR/ub-wide-ptr.rs:101:1
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warning: any use of this value will cause an error
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--> $DIR/ub-wide-ptr.rs:103:55
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LL | const TRAIT_OBJ_SHORT_VTABLE_2: &dyn Trait = unsafe { mem::transmute((&92u8, &3u64)) };
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed: encountered too small vtable
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| ------------------------------------------------------^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^---
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| |
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| memory access failed: pointer must be in-bounds at offset N, but is outside bounds of allocN which has size N
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|
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= note: The rules on what exactly is undefined behavior aren't clear, so this check might be overzealous. Please open an issue on the rustc repository if you believe it should not be considered undefined behavior.
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note: the lint level is defined here
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--> $DIR/ub-wide-ptr.rs:102:8
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LL | #[warn(const_err)]
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| ^^^^^^^^^
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error[E0080]: it is undefined behavior to use this value
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--> $DIR/ub-wide-ptr.rs:104:1
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warning: any use of this value will cause an error
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--> $DIR/ub-wide-ptr.rs:107:51
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LL | const TRAIT_OBJ_INT_VTABLE: &dyn Trait = unsafe { mem::transmute((&92u8, 4usize)) };
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed: encountered dangling vtable pointer in wide pointer
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| --------------------------------------------------^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^---
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| |
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| unable to turn bytes into a pointer
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|
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= note: The rules on what exactly is undefined behavior aren't clear, so this check might be overzealous. Please open an issue on the rustc repository if you believe it should not be considered undefined behavior.
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note: the lint level is defined here
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--> $DIR/ub-wide-ptr.rs:106:8
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LL | #[warn(const_err)]
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| ^^^^^^^^^
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error[E0080]: it is undefined behavior to use this value
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--> $DIR/ub-wide-ptr.rs:106:1
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--> $DIR/ub-wide-ptr.rs:109:1
|
||||
|
|
||||
LL | const TRAIT_OBJ_UNALIGNED_VTABLE: &dyn Trait = unsafe { mem::transmute((&92u8, &[0u8; 128])) };
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed: encountered unaligned vtable pointer in wide pointer
|
||||
|
|
@ -167,7 +185,7 @@ LL | const TRAIT_OBJ_UNALIGNED_VTABLE: &dyn Trait = unsafe { mem::transmute((&92
|
|||
= note: The rules on what exactly is undefined behavior aren't clear, so this check might be overzealous. Please open an issue on the rustc repository if you believe it should not be considered undefined behavior.
|
||||
|
||||
error[E0080]: it is undefined behavior to use this value
|
||||
--> $DIR/ub-wide-ptr.rs:108:1
|
||||
--> $DIR/ub-wide-ptr.rs:111:1
|
||||
|
|
||||
LL | const TRAIT_OBJ_BAD_DROP_FN_NULL: &dyn Trait = unsafe { mem::transmute((&92u8, &[0usize; 8])) };
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed: encountered invalid drop function pointer in vtable (not pointing to a function)
|
||||
|
|
@ -175,23 +193,29 @@ LL | const TRAIT_OBJ_BAD_DROP_FN_NULL: &dyn Trait = unsafe { mem::transmute((&92
|
|||
= note: The rules on what exactly is undefined behavior aren't clear, so this check might be overzealous. Please open an issue on the rustc repository if you believe it should not be considered undefined behavior.
|
||||
|
||||
error[E0080]: it is undefined behavior to use this value
|
||||
--> $DIR/ub-wide-ptr.rs:110:1
|
||||
--> $DIR/ub-wide-ptr.rs:113:1
|
||||
|
|
||||
LL | const TRAIT_OBJ_BAD_DROP_FN_INT: &dyn Trait = unsafe { mem::transmute((&92u8, &[1usize; 8])) };
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed: encountered invalid drop function pointer in vtable (not pointing to a function)
|
||||
|
|
||||
= note: The rules on what exactly is undefined behavior aren't clear, so this check might be overzealous. Please open an issue on the rustc repository if you believe it should not be considered undefined behavior.
|
||||
|
||||
error[E0080]: it is undefined behavior to use this value
|
||||
--> $DIR/ub-wide-ptr.rs:112:1
|
||||
warning: any use of this value will cause an error
|
||||
--> $DIR/ub-wide-ptr.rs:116:63
|
||||
|
|
||||
LL | const TRAIT_OBJ_BAD_DROP_FN_NOT_FN_PTR: &dyn Trait = unsafe { mem::transmute((&92u8, &[&42u8; 8])) };
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed: encountered invalid drop function pointer in vtable (not pointing to a function)
|
||||
| --------------------------------------------------------------^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^---
|
||||
| |
|
||||
| "pointer-to-integer cast" needs an rfc before being allowed inside constants
|
||||
|
|
||||
= note: The rules on what exactly is undefined behavior aren't clear, so this check might be overzealous. Please open an issue on the rustc repository if you believe it should not be considered undefined behavior.
|
||||
note: the lint level is defined here
|
||||
--> $DIR/ub-wide-ptr.rs:115:8
|
||||
|
|
||||
LL | #[warn(const_err)]
|
||||
| ^^^^^^^^^
|
||||
|
||||
error[E0080]: it is undefined behavior to use this value
|
||||
--> $DIR/ub-wide-ptr.rs:116:1
|
||||
--> $DIR/ub-wide-ptr.rs:120:1
|
||||
|
|
||||
LL | const TRAIT_OBJ_CONTENT_INVALID: &dyn Trait = unsafe { mem::transmute::<_, &bool>(&3u8) };
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed: encountered 0x03 at .<deref>.<dyn-downcast>, but expected a boolean
|
||||
|
|
@ -199,7 +223,7 @@ LL | const TRAIT_OBJ_CONTENT_INVALID: &dyn Trait = unsafe { mem::transmute::<_,
|
|||
= note: The rules on what exactly is undefined behavior aren't clear, so this check might be overzealous. Please open an issue on the rustc repository if you believe it should not be considered undefined behavior.
|
||||
|
||||
error[E0080]: it is undefined behavior to use this value
|
||||
--> $DIR/ub-wide-ptr.rs:120:1
|
||||
--> $DIR/ub-wide-ptr.rs:124:1
|
||||
|
|
||||
LL | const RAW_TRAIT_OBJ_VTABLE_NULL: *const dyn Trait = unsafe { mem::transmute((&92u8, 0usize)) };
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed: encountered dangling vtable pointer in wide pointer
|
||||
|
|
@ -207,7 +231,7 @@ LL | const RAW_TRAIT_OBJ_VTABLE_NULL: *const dyn Trait = unsafe { mem::transmute
|
|||
= note: The rules on what exactly is undefined behavior aren't clear, so this check might be overzealous. Please open an issue on the rustc repository if you believe it should not be considered undefined behavior.
|
||||
|
||||
error[E0080]: it is undefined behavior to use this value
|
||||
--> $DIR/ub-wide-ptr.rs:122:1
|
||||
--> $DIR/ub-wide-ptr.rs:126:1
|
||||
|
|
||||
LL | const RAW_TRAIT_OBJ_VTABLE_INVALID: *const dyn Trait = unsafe { mem::transmute((&92u8, &3u64)) };
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed: encountered too small vtable
|
||||
|
|
@ -215,17 +239,17 @@ LL | const RAW_TRAIT_OBJ_VTABLE_INVALID: *const dyn Trait = unsafe { mem::transm
|
|||
= note: The rules on what exactly is undefined behavior aren't clear, so this check might be overzealous. Please open an issue on the rustc repository if you believe it should not be considered undefined behavior.
|
||||
|
||||
error[E0080]: could not evaluate static initializer
|
||||
--> $DIR/ub-wide-ptr.rs:128:5
|
||||
--> $DIR/ub-wide-ptr.rs:132:5
|
||||
|
|
||||
LL | mem::transmute::<_, &dyn Trait>((&92u8, 0usize))
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ inbounds test failed: 0x0 is not a valid pointer
|
||||
|
||||
error[E0080]: could not evaluate static initializer
|
||||
--> $DIR/ub-wide-ptr.rs:132:5
|
||||
--> $DIR/ub-wide-ptr.rs:136:5
|
||||
|
|
||||
LL | mem::transmute::<_, &dyn Trait>((&92u8, &3u64))
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ memory access failed: pointer must be in-bounds at offset N, but is outside bounds of allocN which has size N
|
||||
|
||||
error: aborting due to 28 previous errors
|
||||
error: aborting due to 24 previous errors; 4 warnings emitted
|
||||
|
||||
For more information about this error, try `rustc --explain E0080`.
|
||||
|
|
|
|||
|
|
@ -14,6 +14,11 @@ note: ...which requires const-evaluating + checking `Foo::bytes::{constant#0}`..
|
|||
|
|
||||
LL | bytes: [u8; std::mem::size_of::<Foo>()]
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^
|
||||
note: ...which requires simplifying constant for the type system `std::intrinsics::size_of`...
|
||||
--> $SRC_DIR/core/src/intrinsics.rs:LL:COL
|
||||
|
|
||||
LL | pub fn size_of<T>() -> usize;
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
||||
= note: ...which requires computing layout of `Foo`...
|
||||
= note: ...which requires normalizing `[u8; _]`...
|
||||
= note: ...which again requires simplifying constant for the type system `Foo::bytes::{constant#0}`, completing the cycle
|
||||
|
|
|
|||
|
|
@ -35,11 +35,11 @@ LL | U8_MUT => true,
|
|||
| ^^^^^^
|
||||
|
||||
warning: any use of this value will cause an error
|
||||
--> $DIR/const_refers_to_static_cross_crate.rs:26:14
|
||||
--> $DIR/const_refers_to_static_cross_crate.rs:26:15
|
||||
|
|
||||
LL | / const U8_MUT2: &u8 = {
|
||||
LL | | unsafe { &(*static_cross_crate::ZERO_REF)[0] }
|
||||
| | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ constant accesses static
|
||||
| | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ constant accesses static
|
||||
LL | |
|
||||
LL | |
|
||||
LL | | };
|
||||
|
|
|
|||
|
|
@ -66,6 +66,7 @@ const _: *const u8 =
|
|||
//~^ NOTE
|
||||
unsafe { std::ptr::raw_const!((*(FOO as *const usize as *const [u8; 1000]))[999]) };
|
||||
//~^ ERROR any use of this value will cause an error
|
||||
//~| NOTE
|
||||
|
||||
const _: usize = unsafe { std::mem::transmute::<*const usize, usize>(FOO) + 4 };
|
||||
//~^ ERROR any use of this value will cause an error
|
||||
|
|
|
|||
|
|
@ -16,19 +16,17 @@ LL | const _: *const usize = unsafe { (FOO as *const usize).offset(2) };
|
|||
= note: `#[deny(const_err)]` on by default
|
||||
|
||||
error: any use of this value will cause an error
|
||||
--> $DIR/ptr_comparisons.rs:67:14
|
||||
--> $DIR/ptr_comparisons.rs:67:35
|
||||
|
|
||||
LL | / const _: *const u8 =
|
||||
LL | |
|
||||
LL | | unsafe { std::ptr::raw_const!((*(FOO as *const usize as *const [u8; 1000]))[999]) };
|
||||
| |______________^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^__-
|
||||
| |
|
||||
| memory access failed: pointer must be in-bounds at offset 1000, but is outside bounds of alloc2 which has size $WORD
|
||||
|
|
||||
= note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
|
||||
| |___________________________________^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^___-
|
||||
| |
|
||||
| memory access failed: pointer must be in-bounds at offset 1000, but is outside bounds of alloc2 which has size $WORD
|
||||
|
||||
error: any use of this value will cause an error
|
||||
--> $DIR/ptr_comparisons.rs:70:27
|
||||
--> $DIR/ptr_comparisons.rs:71:27
|
||||
|
|
||||
LL | const _: usize = unsafe { std::mem::transmute::<*const usize, usize>(FOO) + 4 };
|
||||
| --------------------------^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^---
|
||||
|
|
@ -36,7 +34,7 @@ LL | const _: usize = unsafe { std::mem::transmute::<*const usize, usize>(FOO) +
|
|||
| "pointer-to-integer cast" needs an rfc before being allowed inside constants
|
||||
|
||||
error: any use of this value will cause an error
|
||||
--> $DIR/ptr_comparisons.rs:75:27
|
||||
--> $DIR/ptr_comparisons.rs:76:27
|
||||
|
|
||||
LL | const _: usize = unsafe { *std::mem::transmute::<&&usize, &usize>(&FOO) + 4 };
|
||||
| --------------------------^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^---
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue