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Refactor SourceProvider to use cleaner architecture

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This is Phase 1-4 of the SourceProvider refactoring plan to eliminate
complexity, reduce memory usage, and clarify ownership.

**New Infrastructure (Phase 1)**:
- Created TranspiledSource.zig: Minimal POD struct for transpiled code
- Created SpecialModule.zig: For JSValue-based special cases
- Created ModuleResult.zig: Tagged union return type
- Created BunSourceProvider.h/.cpp: Cleaner C++ SourceProvider class

**Zig Side Updates (Phase 2)**:
- Updated ModuleLoader.zig to use ModuleResult types
- Added conversion helpers for backward compatibility
- Updated transpileSourceCode() and fetchBuiltinModule() to return ModuleResult

**C++ Side Updates (Phase 3)**:
- Updated ModuleLoader.cpp to use Bun__createSourceProvider bridge
- Migrated 6 call sites from ZigSourceProvider to BunSourceProvider
- Added proper reference counting and memory management

**Cleanup (Phase 4)**:
- Moved helper functions to BunSourceProvider
- Removed unnecessary includes
- Kept ZigSourceProvider for JSCommonJSModule backward compatibility

**Benefits**:
- Reduced struct size: 12 fields → 5 fields for common case
- Type-safe tagged union prevents accessing wrong fields
- Thread-safe TranspiledSource (no JSValue fields)
- Clear ownership model (source_code transfers to C++)
- Maintained full backward compatibility

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>
This commit is contained in:
Claude Bot
2025-10-25 05:10:41 +00:00
parent 0dd6aa47ea
commit 503a9280ed
13 changed files with 601 additions and 120 deletions
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94
src/bun.js/bindings/ModuleLoader.cpp
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@@ -11,7 +11,7 @@
#include <JavaScriptCore/JSInternalPromise.h>
#include <JavaScriptCore/JSInternalFieldObjectImpl.h>
#include "ZigSourceProvider.h"
#include "BunSourceProvider.h"
#include <JavaScriptCore/JSSourceCode.h>
#include <JavaScriptCore/JSString.h>
@@ -41,6 +41,39 @@
#include "BunProcess.h"
// Forward declare the new Zig C structs
extern "C" {
// Must match TranspiledSource.zig
struct TranspiledSource {
BunString source_code;
BunString source_url;
uint8_t* bytecode_cache;
size_t bytecode_cache_len;
uint32_t flags; // packed struct: is_commonjs:1, is_already_bundled:1, padding:30
};
// Must match SpecialModule.zig
struct SpecialModule {
uint32_t tag; // exports_object=0, export_default_object=1, custom_extension=2
JSC::EncodedJSValue jsvalue;
};
// Must match ModuleResult.zig
struct ModuleResult {
uint32_t tag; // transpiled=0, special=1, builtin=2
union {
TranspiledSource transpiled;
SpecialModule special;
uint32_t builtin_id;
} value;
};
// Bridge function to create BunSourceProvider from TranspiledSource
JSC::SourceProvider* Bun__createSourceProvider(
Zig::GlobalObject* globalObject,
const TranspiledSource* transpiled);
}
namespace Bun {
using namespace JSC;
using namespace Zig;
@@ -64,6 +97,24 @@ public:
ErrorableResolvedSource* res;
};
// Helper: Convert ResolvedSource to TranspiledSource
static TranspiledSource resolvedSourceToTranspiledSource(const ResolvedSource& resolved)
{
TranspiledSource transpiled;
transpiled.source_code = resolved.source_code;
transpiled.source_url = resolved.source_url;
transpiled.bytecode_cache = resolved.bytecode_cache;
transpiled.bytecode_cache_len = resolved.bytecode_cache_size;
// Pack flags
uint32_t flags = 0;
if (resolved.isCommonJSModule) flags |= 0x1;
if (resolved.already_bundled) flags |= 0x2;
transpiled.flags = flags;
return transpiled;
}
extern "C" BunLoaderType Bun__getDefaultLoader(JSC::JSGlobalObject*, BunString* specifier);
static JSC::JSInternalPromise* rejectedInternalPromise(JSC::JSGlobalObject* globalObject, JSC::JSValue value)
@@ -389,8 +440,11 @@ static JSValue handleVirtualModuleResult(
RELEASE_AND_RETURN(scope, reject(JSValue::decode(res->result.err.value)));
}
auto provider = Zig::SourceProvider::create(globalObject, res->result.value);
return resolve(JSC::JSSourceCode::create(vm, JSC::SourceCode(provider)));
// Use new BunSourceProvider for virtual module transpiled code
auto transpiled = resolvedSourceToTranspiledSource(res->result.value);
auto* providerPtr = Bun__createSourceProvider(globalObject, &transpiled);
Ref<JSC::SourceProvider> provider = adoptRef(*providerPtr);
return resolve(JSC::JSSourceCode::create(vm, JSC::SourceCode(WTFMove(provider))));
}
case OnLoadResultTypeError: {
RELEASE_AND_RETURN(scope, reject(onLoadResult.value.error));
@@ -508,8 +562,11 @@ extern "C" void Bun__onFulfillAsyncModule(
}
}
} else {
auto&& provider = Zig::SourceProvider::create(jsDynamicCast<Zig::GlobalObject*>(globalObject), res->result.value);
promise->resolve(globalObject, JSC::JSSourceCode::create(vm, JSC::SourceCode(provider)));
// Use new BunSourceProvider for transpiled ESM code
auto transpiled = resolvedSourceToTranspiledSource(res->result.value);
auto* providerPtr = Bun__createSourceProvider(jsDynamicCast<Zig::GlobalObject*>(globalObject), &transpiled);
Ref<JSC::SourceProvider> provider = adoptRef(*providerPtr);
promise->resolve(globalObject, JSC::JSSourceCode::create(vm, JSC::SourceCode(WTFMove(provider))));
scope.assertNoExceptionExceptTermination();
}
} else {
@@ -852,8 +909,11 @@ JSValue fetchCommonJSModuleNonBuiltin(
RELEASE_AND_RETURN(scope, target);
}
auto&& provider = Zig::SourceProvider::create(globalObject, res->result.value);
globalObject->moduleLoader()->provideFetch(globalObject, specifierValue, JSC::SourceCode(provider));
// Use new BunSourceProvider for transpiled code
auto transpiled = resolvedSourceToTranspiledSource(res->result.value);
auto* providerPtr = Bun__createSourceProvider(globalObject, &transpiled);
Ref<JSC::SourceProvider> provider = adoptRef(*providerPtr);
globalObject->moduleLoader()->provideFetch(globalObject, specifierValue, JSC::SourceCode(WTFMove(provider)));
RETURN_IF_EXCEPTION(scope, {});
RELEASE_AND_RETURN(scope, jsNumber(-1));
}
@@ -974,8 +1034,11 @@ static JSValue fetchESMSourceCode(
auto tag = res->result.value.tag;
switch (tag) {
case SyntheticModuleType::ESM: {
auto&& provider = Zig::SourceProvider::create(globalObject, res->result.value, JSC::SourceProviderSourceType::Module, true);
RELEASE_AND_RETURN(scope, rejectOrResolve(JSSourceCode::create(vm, JSC::SourceCode(provider))));
// Use new BunSourceProvider for builtin ESM modules
auto transpiled = resolvedSourceToTranspiledSource(res->result.value);
auto* providerPtr = Bun__createSourceProvider(globalObject, &transpiled);
Ref<JSC::SourceProvider> provider = adoptRef(*providerPtr);
RELEASE_AND_RETURN(scope, rejectOrResolve(JSSourceCode::create(vm, JSC::SourceCode(WTFMove(provider)))));
}
#define CASE(str, name) \
@@ -993,8 +1056,11 @@ static JSValue fetchESMSourceCode(
auto source = JSC::SourceCode(JSC::SyntheticSourceProvider::create(generateInternalModuleSourceCode(globalObject, static_cast<InternalModuleRegistry::Field>(tag & mask)), JSC::SourceOrigin(URL(makeString("builtins://"_s, moduleKey))), moduleKey));
RELEASE_AND_RETURN(scope, rejectOrResolve(JSSourceCode::create(vm, WTFMove(source))));
} else {
auto&& provider = Zig::SourceProvider::create(globalObject, res->result.value, JSC::SourceProviderSourceType::Module, true);
RELEASE_AND_RETURN(scope, rejectOrResolve(JSC::JSSourceCode::create(vm, JSC::SourceCode(provider))));
// Use new BunSourceProvider for builtin transpiled modules
auto transpiled = resolvedSourceToTranspiledSource(res->result.value);
auto* providerPtr = Bun__createSourceProvider(globalObject, &transpiled);
Ref<JSC::SourceProvider> provider = adoptRef(*providerPtr);
RELEASE_AND_RETURN(scope, rejectOrResolve(JSC::JSSourceCode::create(vm, JSC::SourceCode(WTFMove(provider)))));
}
}
}
@@ -1105,7 +1171,11 @@ static JSValue fetchESMSourceCode(
RELEASE_AND_RETURN(scope, rejectOrResolve(JSSourceCode::create(globalObject->vm(), WTFMove(source))));
}
RELEASE_AND_RETURN(scope, rejectOrResolve(JSC::JSSourceCode::create(vm, JSC::SourceCode(Zig::SourceProvider::create(globalObject, res->result.value)))));
// Use new BunSourceProvider for transpiled code
auto transpiled = resolvedSourceToTranspiledSource(res->result.value);
auto* providerPtr = Bun__createSourceProvider(globalObject, &transpiled);
Ref<JSC::SourceProvider> provider = adoptRef(*providerPtr);
RELEASE_AND_RETURN(scope, rejectOrResolve(JSC::JSSourceCode::create(vm, JSC::SourceCode(WTFMove(provider)))));
}
JSValue fetchESMSourceCodeSync(