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[mir-opt] Allow debuginfo to be generated for a constant or a Place Prior to this commit, debuginfo was always generated by mapping a name to a Place. This has the side-effect that `SimplifyLocals` cannot remove locals that are only used for debuginfo because their other uses have been const-propagated. To allow these locals to be removed, we now allow debuginfo to point to a constant value. The `ConstProp` pass detects when debuginfo points to a local with a known constant value and replaces it with the value. This allows the later `SimplifyLocals` pass to remove the local.
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- // MIR for `main` before ConstDebugInfo
+ // MIR for `main` after ConstDebugInfo
fn main() -> () {
Remove comments from mir-opt MIR dumps
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let mut _0: ();
let _1: u8;
let mut _5: u8;
let mut _6: u8;
let mut _7: u8;
let mut _8: u8;
let mut _12: u32;
let mut _13: u32;
[mir-opt] Allow debuginfo to be generated for a constant or a Place Prior to this commit, debuginfo was always generated by mapping a name to a Place. This has the side-effect that `SimplifyLocals` cannot remove locals that are only used for debuginfo because their other uses have been const-propagated. To allow these locals to be removed, we now allow debuginfo to point to a constant value. The `ConstProp` pass detects when debuginfo points to a local with a known constant value and replaces it with the value. This allows the later `SimplifyLocals` pass to remove the local.
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scope 1 {
Remove comments from mir-opt MIR dumps
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- debug x => _1;
+ debug x => const 1_u8;
let _2: u8;
[mir-opt] Allow debuginfo to be generated for a constant or a Place Prior to this commit, debuginfo was always generated by mapping a name to a Place. This has the side-effect that `SimplifyLocals` cannot remove locals that are only used for debuginfo because their other uses have been const-propagated. To allow these locals to be removed, we now allow debuginfo to point to a constant value. The `ConstProp` pass detects when debuginfo points to a local with a known constant value and replaces it with the value. This allows the later `SimplifyLocals` pass to remove the local.
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scope 2 {
Remove comments from mir-opt MIR dumps
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- debug y => _2;
+ debug y => const 2_u8;
let _3: u8;
[mir-opt] Allow debuginfo to be generated for a constant or a Place Prior to this commit, debuginfo was always generated by mapping a name to a Place. This has the side-effect that `SimplifyLocals` cannot remove locals that are only used for debuginfo because their other uses have been const-propagated. To allow these locals to be removed, we now allow debuginfo to point to a constant value. The `ConstProp` pass detects when debuginfo points to a local with a known constant value and replaces it with the value. This allows the later `SimplifyLocals` pass to remove the local.
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scope 3 {
Remove comments from mir-opt MIR dumps
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- debug z => _3;
+ debug z => const 3_u8;
let _4: u8;
[mir-opt] Allow debuginfo to be generated for a constant or a Place Prior to this commit, debuginfo was always generated by mapping a name to a Place. This has the side-effect that `SimplifyLocals` cannot remove locals that are only used for debuginfo because their other uses have been const-propagated. To allow these locals to be removed, we now allow debuginfo to point to a constant value. The `ConstProp` pass detects when debuginfo points to a local with a known constant value and replaces it with the value. This allows the later `SimplifyLocals` pass to remove the local.
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scope 4 {
Remove comments from mir-opt MIR dumps
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- debug sum => _4;
+ debug sum => const 6_u8;
let _9: &str;
[mir-opt] Allow debuginfo to be generated for a constant or a Place Prior to this commit, debuginfo was always generated by mapping a name to a Place. This has the side-effect that `SimplifyLocals` cannot remove locals that are only used for debuginfo because their other uses have been const-propagated. To allow these locals to be removed, we now allow debuginfo to point to a constant value. The `ConstProp` pass detects when debuginfo points to a local with a known constant value and replaces it with the value. This allows the later `SimplifyLocals` pass to remove the local.
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scope 5 {
Remove comments from mir-opt MIR dumps
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- debug s => _9;
+ debug s => const "hello, world!";
let _14: bool;
let _15: bool;
let _16: u32;
[mir-opt] Allow debuginfo to be generated for a constant or a Place Prior to this commit, debuginfo was always generated by mapping a name to a Place. This has the side-effect that `SimplifyLocals` cannot remove locals that are only used for debuginfo because their other uses have been const-propagated. To allow these locals to be removed, we now allow debuginfo to point to a constant value. The `ConstProp` pass detects when debuginfo points to a local with a known constant value and replaces it with the value. This allows the later `SimplifyLocals` pass to remove the local.
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scope 6 {
Refactor how MIR represents composite debuginfo.
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- debug ((f: (bool, bool, u32)).0: bool) => _14;
- debug ((f: (bool, bool, u32)).1: bool) => _15;
- debug ((f: (bool, bool, u32)).2: u32) => _16;
+ debug ((f: (bool, bool, u32)).0: bool) => const true;
+ debug ((f: (bool, bool, u32)).1: bool) => const false;
+ debug ((f: (bool, bool, u32)).2: u32) => const 123_u32;
Remove comments from mir-opt MIR dumps
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let _10: std::option::Option<u16>;
[mir-opt] Allow debuginfo to be generated for a constant or a Place Prior to this commit, debuginfo was always generated by mapping a name to a Place. This has the side-effect that `SimplifyLocals` cannot remove locals that are only used for debuginfo because their other uses have been const-propagated. To allow these locals to be removed, we now allow debuginfo to point to a constant value. The `ConstProp` pass detects when debuginfo points to a local with a known constant value and replaces it with the value. This allows the later `SimplifyLocals` pass to remove the local.
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scope 7 {
Generate ValTrees in DataflowConstProp.
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- debug o => _10;
+ debug o => const Option::<u16>::Some(99);
Remove comments from mir-opt MIR dumps
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let _17: u32;
let _18: u32;
[mir-opt] Allow debuginfo to be generated for a constant or a Place Prior to this commit, debuginfo was always generated by mapping a name to a Place. This has the side-effect that `SimplifyLocals` cannot remove locals that are only used for debuginfo because their other uses have been const-propagated. To allow these locals to be removed, we now allow debuginfo to point to a constant value. The `ConstProp` pass detects when debuginfo points to a local with a known constant value and replaces it with the value. This allows the later `SimplifyLocals` pass to remove the local.
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scope 8 {
Refactor how MIR represents composite debuginfo.
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- debug ((p: Point).0: u32) => _17;
- debug ((p: Point).1: u32) => _18;
+ debug ((p: Point).0: u32) => const 32_u32;
+ debug ((p: Point).1: u32) => const 32_u32;
Remove comments from mir-opt MIR dumps
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let _11: u32;
[mir-opt] Allow debuginfo to be generated for a constant or a Place Prior to this commit, debuginfo was always generated by mapping a name to a Place. This has the side-effect that `SimplifyLocals` cannot remove locals that are only used for debuginfo because their other uses have been const-propagated. To allow these locals to be removed, we now allow debuginfo to point to a constant value. The `ConstProp` pass detects when debuginfo points to a local with a known constant value and replaces it with the value. This allows the later `SimplifyLocals` pass to remove the local.
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scope 9 {
Remove comments from mir-opt MIR dumps
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- debug a => _11;
+ debug a => const 64_u32;
[mir-opt] Allow debuginfo to be generated for a constant or a Place Prior to this commit, debuginfo was always generated by mapping a name to a Place. This has the side-effect that `SimplifyLocals` cannot remove locals that are only used for debuginfo because their other uses have been const-propagated. To allow these locals to be removed, we now allow debuginfo to point to a constant value. The `ConstProp` pass detects when debuginfo points to a local with a known constant value and replaces it with the value. This allows the later `SimplifyLocals` pass to remove the local.
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}
}
}
}
}
}
}
}
}
bb0: {
Remove comments from mir-opt MIR dumps
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_1 = const 1_u8;
_2 = const 2_u8;
_3 = const 3_u8;
StorageLive(_4);
StorageLive(_5);
_5 = const 3_u8;
_4 = const 6_u8;
StorageDead(_5);
StorageLive(_9);
_9 = const "hello, world!";
StorageLive(_14);
StorageLive(_15);
StorageLive(_16);
_14 = const true;
_15 = const false;
_16 = const 123_u32;
StorageLive(_10);
Generate ValTrees in DataflowConstProp.
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_10 = const Option::<u16>::Some(99);
Remove comments from mir-opt MIR dumps
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_17 = const 32_u32;
_18 = const 32_u32;
StorageLive(_11);
_11 = const 64_u32;
StorageDead(_11);
StorageDead(_10);
StorageDead(_14);
StorageDead(_15);
StorageDead(_16);
StorageDead(_9);
StorageDead(_4);
return;
[mir-opt] Allow debuginfo to be generated for a constant or a Place Prior to this commit, debuginfo was always generated by mapping a name to a Place. This has the side-effect that `SimplifyLocals` cannot remove locals that are only used for debuginfo because their other uses have been const-propagated. To allow these locals to be removed, we now allow debuginfo to point to a constant value. The `ConstProp` pass detects when debuginfo points to a local with a known constant value and replaces it with the value. This allows the later `SimplifyLocals` pass to remove the local.
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}
}