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rewrite wasm/Emit.zig

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mainly, rework how relocations works. This is the point at which symbol
indexes are known - not before. And don't emit unnecessary relocations!
They're only needed when emitting an object file.

Changes wasm linker to keep MIR around long-lived so that fixups can be
reapplied after linker garbage collection.

use labeled switch while we're at it
This commit is contained in:
Andrew Kelley
2024-12-05 23:46:46 -08:00
parent b9355edfb1
commit e521879e47
11 changed files with 1097 additions and 1140 deletions
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10
src/codegen/llvm.zig
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@@ -1838,11 +1838,11 @@ pub const Object = struct {
o: *Object,
zcu: *Zcu,
exported_value: InternPool.Index,
export_indices: []const u32,
export_indices: []const Zcu.Export.Index,
) link.File.UpdateExportsError!void {
const gpa = zcu.gpa;
const ip = &zcu.intern_pool;
const main_exp_name = try o.builder.strtabString(zcu.all_exports.items[export_indices[0]].opts.name.toSlice(ip));
const main_exp_name = try o.builder.strtabString(export_indices[0].ptr(zcu).opts.name.toSlice(ip));
const global_index = i: {
const gop = try o.uav_map.getOrPut(gpa, exported_value);
if (gop.found_existing) {
@@ -1873,11 +1873,11 @@ pub const Object = struct {
o: *Object,
zcu: *Zcu,
global_index: Builder.Global.Index,
export_indices: []const u32,
export_indices: []const Zcu.Export.Index,
) link.File.UpdateExportsError!void {
const comp = zcu.comp;
const ip = &zcu.intern_pool;
const first_export = zcu.all_exports.items[export_indices[0]];
const first_export = export_indices[0].ptr(zcu);
// We will rename this global to have a name matching `first_export`.
// Successive exports become aliases.
@@ -1934,7 +1934,7 @@ pub const Object = struct {
// Until then we iterate over existing aliases and make them point
// to the correct decl, or otherwise add a new alias. Old aliases are leaked.
for (export_indices[1..]) |export_idx| {
const exp = zcu.all_exports.items[export_idx];
const exp = export_idx.ptr(zcu);
const exp_name = try o.builder.strtabString(exp.opts.name.toSlice(ip));
if (o.builder.getGlobal(exp_name)) |global| {
switch (global.ptrConst(&o.builder).kind) {