Initial reorg.

This is largely the same as #305, but updated for the current tree.

crates/environ/src/address_map.rs

@@ -0,0 +1,59 @@
+//! Data structures to provide transformation of the source
+// addresses of a WebAssembly module into the native code.
+
+use alloc::vec::Vec;
+use cranelift_codegen::ir;
+use cranelift_entity::PrimaryMap;
+use cranelift_wasm::DefinedFuncIndex;
+use serde::{Deserialize, Serialize};
+
+/// Single source location to generated address mapping.
+#[derive(Serialize, Deserialize, Debug, Clone, PartialEq, Eq)]
+pub struct InstructionAddressMap {
+    /// Original source location.
+    pub srcloc: ir::SourceLoc,
+
+    /// Generated instructions offset.
+    pub code_offset: usize,
+
+    /// Generated instructions length.
+    pub code_len: usize,
+}
+
+/// Function and its instructions addresses mappings.
+#[derive(Serialize, Deserialize, Debug, Clone, PartialEq, Eq)]
+pub struct FunctionAddressMap {
+    /// Instructions maps.
+    /// The array is sorted by the InstructionAddressMap::code_offset field.
+    pub instructions: Vec<InstructionAddressMap>,
+
+    /// Function start source location (normally declaration).
+    pub start_srcloc: ir::SourceLoc,
+
+    /// Function end source location.
+    pub end_srcloc: ir::SourceLoc,
+
+    /// Generated function body offset if applicable, otherwise 0.
+    pub body_offset: usize,
+
+    /// Generated function body length.
+    pub body_len: usize,
+}
+
+/// Module functions addresses mappings.
+pub type ModuleAddressMap = PrimaryMap<DefinedFuncIndex, FunctionAddressMap>;
+
+/// Value ranges for functions.
+pub type ValueLabelsRanges = PrimaryMap<DefinedFuncIndex, cranelift_codegen::ValueLabelsRanges>;
+
+/// Stack slots for functions.
+pub type StackSlots = PrimaryMap<DefinedFuncIndex, ir::StackSlots>;
+
+/// Module `vmctx` related info.
+pub struct ModuleVmctxInfo {
+    /// The memory definition offset in the VMContext structure.
+    pub memory_offset: i64,
+
+    /// The functions stack slots.
+    pub stack_slots: StackSlots,
+}