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Add linker data for strings, and deduplicate them

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For references to addresses of constant strings, we make an entry in
reloc.CODE and configure the relocation type to say it points at a
memory address. (At least I think this is right, I can't test it yet!)

The same info can also be used for de-duplication.

It turns out we don't need reloc.DATA. I had misunderstood it.
The use case for that would be constant nested data structures,
where constant data would contain pointers to other constant data.
I don't think we're doing this in Roc at all, but not sure.
This commit is contained in:
Brian Carroll 2021-11-06 10:25:10 +00:00
parent 2f0296a5fa
commit 38d9fc5bbd
5 changed files with 113 additions and 65 deletions
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12
compiler/gen_wasm/src/wasm_module/code_builder.rs
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@ -5,7 +5,7 @@ use std::fmt::Debug;
use roc_module::symbol::Symbol;
use super::linking::{IndexRelocType, RelocationEntry};
use super::linking::{IndexRelocType, OffsetRelocType, RelocationEntry};
use super::opcodes::*;
use super::serialize::{SerialBuffer, Serialize};
use crate::{round_up_to_alignment, FRAME_ALIGNMENT_BYTES, STACK_POINTER_GLOBAL_ID};
@ -461,6 +461,16 @@ impl<'a> CodeBuilder<'a> {
self.code.encode_u32(offset);
}
/// Insert a linker relocation for a memory address
pub fn insert_memory_relocation(&mut self, symbol_index: u32) {
self.relocations.push(RelocationEntry::Offset {
type_id: OffsetRelocType::MemoryAddrLeb,
offset: self.code.len() as u32,
symbol_index,
addend: 0,
});
}
/**********************************************************
INSTRUCTION METHODS