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Move address maps to a section of the compiled image (#3240)

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This commit moves the `address_map` field of `FunctionInfo` into a
custom-encoded section of the executable. The goal of this commit is, as
previous commits, to push less data through `bincode`. The `address_map`
field is actually extremely large and has huge benefits of not being
decoded when we load a module. This data is only used for traps and such
as well, so it's not overly important that it's massaged in to precise
data the runtime can extremely speedily use.

The `FunctionInfo` type does retain a tiny bit of information about the
function itself (it's start source location), but other than that the
`FunctionAddressMap` structure is moved from `wasmtime-environ` to
`wasmtime-cranelift` since it's now no longer needed outside of that
context.
This commit is contained in:
Alex Crichton
2021-08-26 23:06:41 -05:00
committed by GitHub
parent d12f1d77e6
commit fc91176685
10 changed files with 281 additions and 141 deletions
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21
crates/cranelift/src/debug/transform/address_transform.rs
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@@ -1,11 +1,9 @@
use crate::CompiledFunctions;
use crate::{CompiledFunctions, FunctionAddressMap};
use gimli::write;
use more_asserts::assert_le;
use std::collections::BTreeMap;
use std::iter::FromIterator;
use wasmtime_environ::{
DefinedFuncIndex, EntityRef, FilePos, FunctionAddressMap, PrimaryMap, WasmFileInfo,
};
use wasmtime_environ::{DefinedFuncIndex, EntityRef, FilePos, PrimaryMap, WasmFileInfo};
pub type GeneratedAddress = usize;
pub type WasmAddress = u64;
@@ -199,7 +197,7 @@ fn build_function_addr_map(
) -> PrimaryMap<DefinedFuncIndex, FunctionMap> {
let mut map = PrimaryMap::new();
for (_, f) in funcs {
let ft = &f.info.address_map;
let ft = &f.address_map;
let mut fn_map = Vec::new();
for t in ft.instructions.iter() {
if t.srcloc.file_offset().is_none() {
@@ -460,7 +458,7 @@ impl AddressTransform {
let mut func = BTreeMap::new();
for (i, f) in funcs {
let ft = &f.info.address_map;
let ft = &f.address_map;
let (fn_start, fn_end, lookup) = build_function_lookup(ft, code_section_offset);
func.insert(
@@ -611,14 +609,12 @@ impl AddressTransform {
#[cfg(test)]
mod tests {
use super::{build_function_lookup, get_wasm_code_offset, AddressTransform};
use crate::{CompiledFunction, CompiledFunctions};
use crate::{CompiledFunction, CompiledFunctions, FunctionAddressMap};
use cranelift_entity::PrimaryMap;
use gimli::write::Address;
use std::iter::FromIterator;
use std::mem;
use wasmtime_environ::{
FilePos, FunctionAddressMap, FunctionInfo, InstructionAddressMap, WasmFileInfo,
};
use wasmtime_environ::{FilePos, InstructionAddressMap, WasmFileInfo};
#[test]
fn test_get_wasm_code_offset() {
@@ -660,10 +656,7 @@ mod tests {
fn create_simple_module(address_map: FunctionAddressMap) -> CompiledFunctions {
PrimaryMap::from_iter(vec![CompiledFunction {
info: FunctionInfo {
address_map,
..Default::default()
},
address_map,
..Default::default()
}])
}