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debug generated linker data for Roc->JS calls

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Brian Carroll 2022-11-17 21:26:33 +00:00
parent 24e6e8445d
commit 29baa45774
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3 changed files with 46 additions and 31 deletions
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61
crates/compiler/gen_wasm/src/code_builder.rs
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@ -449,42 +449,43 @@ impl<'a> CodeBuilder<'a> {
// Insertions are chunks of code we generated out-of-order.
// Now insert them at the correct offsets.
{
let buffer = &mut module.code.bytes;
buffer.extend_from_slice(&self.inner_length);
buffer.extend_from_slice(&self.preamble);
let buffer = &mut module.code.bytes;
buffer.extend_from_slice(&self.inner_length);
buffer.extend_from_slice(&self.preamble);
let mut code_pos = 0;
for Insertion { at, start, end } in self.insertions.iter() {
buffer.extend_from_slice(&self.code[code_pos..*at]);
code_pos = *at;
buffer.extend_from_slice(&self.insert_bytes[*start..*end]);
}
buffer.extend_from_slice(&self.code[code_pos..self.code.len()]);
let code_offset = buffer.len();
let mut code_pos = 0;
for Insertion { at, start, end } in self.insertions.iter() {
buffer.extend_from_slice(&self.code[code_pos..*at]);
code_pos = *at;
buffer.extend_from_slice(&self.insert_bytes[*start..*end]);
}
buffer.extend_from_slice(&self.code[code_pos..self.code.len()]);
// Create linker relocations for calls to imported functions, whose indices may change during DCE.
{
let relocs = &mut module.reloc_code.entries;
let mut skip = 0;
for (reloc_code_pos, reloc_fn) in self.import_relocations.iter() {
let mut insertion_bytes = 0;
for (i, insertion) in self.insertions.iter().enumerate().skip(skip) {
if insertion.at >= *reloc_code_pos {
break;
}
insertion_bytes = insertion.end;
skip = i;
let relocs = &mut module.reloc_code.entries;
let mut skip = 0;
for (reloc_code_pos, reloc_fn) in self.import_relocations.iter() {
let mut insertion_bytes = 0;
for (i, insertion) in self.insertions.iter().enumerate().skip(skip) {
if insertion.at >= *reloc_code_pos {
break;
}
// Adjust for (1) the offset of this function in the Code section and (2) our own Insertions.
let offset = reloc_code_pos + fn_offset + insertion_bytes;
relocs.push(RelocationEntry::Index {
type_id: IndexRelocType::FunctionIndexLeb,
offset: offset as u32,
symbol_index: *reloc_fn,
})
insertion_bytes = insertion.end;
skip = i;
}
// Adjust for (1) the offset of this function in the Code section and (2) our own Insertions.
let offset = reloc_code_pos + code_offset + insertion_bytes;
let symbol_index = module
.linking
.find_imported_fn_sym_index(*reloc_fn)
.unwrap();
relocs.push(RelocationEntry::Index {
type_id: IndexRelocType::FunctionIndexLeb,
offset: offset as u32,
symbol_index,
});
}
}