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update thir output (rust-lang#1445)
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‎src/thir.md

+105-56
Original file line numberDiff line numberDiff line change
@@ -47,8 +47,18 @@ which is useful to keep peak memory in check. Having a THIR representation of
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all bodies of a crate in memory at the same time would be very heavy.
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You can get a debug representation of the THIR by passing the `-Zunpretty=thir-tree` flag
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to `rustc`. Here is how a function with just the statement `let x = 1 + 2;` gets represented in
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THIR:
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to `rustc`.
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To demonstrate, let's use the following example:
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```rust
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fn main() {
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let x = 1 + 2;
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}
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```
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Here is how that gets represented in THIR (as of <!-- date-check --> Aug 2022):
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```rust,no_run
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Thir {
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// no match arms
@@ -57,65 +67,83 @@ Thir {
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// expression 0, a literal with a value of 1
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Expr {
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ty: i32,
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temp_lifetime: Some(Node(6)),
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temp_lifetime: Some(
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Node(1),
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),
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span: oneplustwo.rs:2:13: 2:14 (#0),
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kind: Literal {
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literal: Const {
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ty: i32,
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val: Value(Scalar(0x00000001)),
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lit: Spanned {
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node: Int(
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1,
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Unsuffixed,
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),
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span: oneplustwo.rs:2:13: 2:14 (#0),
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},
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user_ty: None,
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const_id: None,
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neg: false,
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},
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},
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// expression 1, scope surronding literal 1
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Expr {
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ty: i32,
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temp_lifetime: Some(Node(6)),
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temp_lifetime: Some(
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Node(1),
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),
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span: oneplustwo.rs:2:13: 2:14 (#0),
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kind: Scope {
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region_scope: Node(1),
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lint_level: Explicit(HirId {
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owner: DefId(0:3 ~ oneplustwo[6ccc]::main),
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local_id: 1,
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}),
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// reference to expression 0 above
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region_scope: Node(3),
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lint_level: Explicit(
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HirId {
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owner: DefId(0:3 ~ oneplustwo[6932]::main),
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local_id: 3,
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},
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),
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value: e0,
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},
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},
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// expression 2, literal 2
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Expr {
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ty: i32,
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temp_lifetime: Some(Node(6)),
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temp_lifetime: Some(
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Node(1),
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),
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span: oneplustwo.rs:2:17: 2:18 (#0),
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kind: Literal {
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literal: Const {
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ty: i32,
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val: Value(Scalar(0x00000002)),
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lit: Spanned {
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node: Int(
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2,
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Unsuffixed,
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),
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span: oneplustwo.rs:2:17: 2:18 (#0),
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},
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user_ty: None,
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const_id: None,
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neg: false,
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},
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},
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// expression 3, scope surrounding literal 2
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Expr {
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ty: i32,
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temp_lifetime: Some(Node(6)),
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temp_lifetime: Some(
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Node(1),
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),
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span: oneplustwo.rs:2:17: 2:18 (#0),
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kind: Scope {
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region_scope: Node(2),
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lint_level: Explicit(HirId {
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owner: DefId(0:3 ~ oneplustwo[6ccc]::main),
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local_id: 2,
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}),
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region_scope: Node(4),
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lint_level: Explicit(
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HirId {
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owner: DefId(0:3 ~ oneplustwo[6932]::main),
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local_id: 4,
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},
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),
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// reference to expression 2 above
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value: e2,
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},
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},
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// expression 4, represents 1 + 2
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Expr {
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ty: i32,
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temp_lifetime: Some(Node(6)),
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temp_lifetime: Some(
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Node(1),
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),
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span: oneplustwo.rs:2:13: 2:18 (#0),
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kind: Binary {
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op: Add,
@@ -127,30 +155,38 @@ Thir {
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// expression 5, scope surronding expression 4
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Expr {
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ty: i32,
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temp_lifetime: Some(Node(6)),
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temp_lifetime: Some(
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Node(1),
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),
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span: oneplustwo.rs:2:13: 2:18 (#0),
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kind: Scope {
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region_scope: Node(3),
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lint_level: Explicit(HirId {
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owner: DefId(0:3 ~ oneplustwo[6ccc]::main),
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local_id: 3,
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}),
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region_scope: Node(5),
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lint_level: Explicit(
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HirId {
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owner: DefId(0:3 ~ oneplustwo[6932]::main),
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local_id: 5,
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},
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),
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value: e4,
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},
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},
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// expression 6, block around statement
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Expr {
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ty: (),
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temp_lifetime: Some(Node(8)),
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temp_lifetime: Some(
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Node(9),
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),
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span: oneplustwo.rs:1:11: 3:2 (#0),
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kind: Block {
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body: Block {
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targeted_by_break: false,
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region_scope: Node(7),
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region_scope: Node(8),
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opt_destruction_scope: None,
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span: oneplustwo.rs:1:11: 3:2 (#0),
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// reference to statement 0 below
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stmts: [ s0 ],
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stmts: [
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s0,
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],
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expr: None,
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safety_mode: Safe,
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},
@@ -160,25 +196,29 @@ Thir {
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Expr {
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ty: (),
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temp_lifetime: Some(
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Node(8),
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Node(9),
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),
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span: oneplustwo.rs:1:11: 3:2 (#0),
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kind: Scope {
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region_scope: Node(8),
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lint_level: Explicit(HirId {
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owner: DefId(0:3 ~ oneplustwo[6ccc]::main),
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local_id: 8,
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}),
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region_scope: Node(9),
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lint_level: Explicit(
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HirId {
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owner: DefId(0:3 ~ oneplustwo[6932]::main),
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local_id: 9,
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},
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),
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value: e6,
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},
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},
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// destruction scope around expression 7
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Expr {
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ty: (),
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temp_lifetime: Some(Node(8)),
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temp_lifetime: Some(
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Node(9),
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),
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span: oneplustwo.rs:1:11: 3:2 (#0),
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kind: Scope {
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region_scope: Destruction(8),
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region_scope: Destruction(9),
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lint_level: Inherited,
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value: e7,
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},
@@ -188,31 +228,40 @@ Thir {
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// let statement
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Stmt {
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kind: Let {
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remainder_scope: Remainder { block: 7, first_statement_index: 0},
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init_scope: Node(6),
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remainder_scope: Remainder { block: 8, first_statement_index: 0},
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init_scope: Node(1),
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pattern: Pat {
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ty: i32,
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span: oneplustwo.rs:2:9: 2:10 (#0),
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kind: Binding {
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mutability: Not,
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name: "x",
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mode: ByValue,
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var: HirId {
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owner: DefId(0:3 ~ oneplustwo[6ccc]::main),
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local_id: 5,
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},
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var: LocalVarId(
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HirId {
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owner: DefId(0:3 ~ oneplustwo[6932]::main),
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local_id: 7,
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},
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),
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ty: i32,
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subpattern: None,
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is_primary: true,
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},
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},
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initializer: Some(e5),
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lint_level: Explicit(HirId {
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owner: DefId(0:3 ~ oneplustwo[6ccc]::main),
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local_id: 4,
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}),
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initializer: Some(
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e5,
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),
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else_block: None,
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lint_level: Explicit(
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HirId {
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owner: DefId(0:3 ~ oneplustwo[6932]::main),
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local_id: 6,
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},
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),
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},
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opt_destruction_scope: Some(Destruction(6)),
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opt_destruction_scope: Some(
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Destruction(1),
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),
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},
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],
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}

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