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LibWasm: Implement a very basic linker

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This will simply "link" any given module instances and produce a list of
external values that can be used to instantiate a module.
Note that this is extremely basic and cannot resolve circular
dependencies, and depends on the instance order.
This commit is contained in:
Ali Mohammad Pur 2021-05-10 17:26:17 +04:30 • committed by Linus Groh
parent 3283c8a495
commit 35b3ae26ed
3 changed files with 206 additions and 15 deletions
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47
Userland/Libraries/LibWasm/AbstractMachine/AbstractMachine.h
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@ -6,6 +6,8 @@
#pragma once
#include <AK/HashMap.h>
#include <AK/HashTable.h>
#include <AK/OwnPtr.h>
#include <AK/Result.h>
#include <LibWasm/Types.h>
@ -15,6 +17,13 @@ namespace Wasm {
struct InstantiationError {
String error { "Unknown error" };
};
struct LinkError {
enum OtherErrors {
InvalidImportedModule,
};
Vector<String> missing_imports;
Vector<OtherErrors> other_errors;
};
TYPEDEF_DISTINCT_NUMERIC_GENERAL(u64, true, true, false, false, false, true, FunctionAddress);
TYPEDEF_DISTINCT_NUMERIC_GENERAL(u64, true, true, false, false, false, true, ExternAddress);
@ -436,4 +445,42 @@ private:
Store m_store;
};
class Linker {
public:
struct Name {
String module;
String name;
ImportSection::Import::ImportDesc type;
};
explicit Linker(const Module& module)
: m_module(module)
{
}
// Link a module, the import 'module name' is ignored with this.
void link(const ModuleInstance&);
// Link a bunch of qualified values, also matches 'module name'.
void link(const HashMap<Name, ExternValue>&);
AK::Result<Vector<ExternValue>, LinkError> finish();
private:
void populate();
const Module& m_module;
HashMap<Name, ExternValue> m_resolved_imports;
HashTable<Name> m_unresolved_imports;
Vector<Name> m_ordered_imports;
Optional<LinkError> m_error;
};
}
template<>
struct AK::Traits<Wasm::Linker::Name> : public AK::GenericTraits<Wasm::Linker::Name> {
static constexpr bool is_trivial() { return false; }
static unsigned hash(const Wasm::Linker::Name& entry) { return pair_int_hash(entry.module.hash(), entry.name.hash()); }
static bool equals(const Wasm::Linker::Name& a, const Wasm::Linker::Name& b) { return a.name == b.name && a.module == b.module; }
};