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-rw-r--r--src/passes/CMakeLists.txt1
-rw-r--r--src/passes/LegalizeJSInterface.cpp211
-rw-r--r--src/passes/pass.cpp1
-rw-r--r--src/passes/passes.h5
4 files changed, 216 insertions, 2 deletions
diff --git a/src/passes/CMakeLists.txt b/src/passes/CMakeLists.txt
index 30f63c880..3f6574ec4 100644
--- a/src/passes/CMakeLists.txt
+++ b/src/passes/CMakeLists.txt
@@ -4,6 +4,7 @@ SET(passes_SOURCES
DeadCodeElimination.cpp
DuplicateFunctionElimination.cpp
ExtractFunction.cpp
+ LegalizeJSInterface.cpp
MergeBlocks.cpp
Metrics.cpp
NameManager.cpp
diff --git a/src/passes/LegalizeJSInterface.cpp b/src/passes/LegalizeJSInterface.cpp
new file mode 100644
index 000000000..996197701
--- /dev/null
+++ b/src/passes/LegalizeJSInterface.cpp
@@ -0,0 +1,211 @@
+/*
+ * Copyright 2016 WebAssembly Community Group participants
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+//
+// i64 values are not valid in JS, and must be handled in some other
+// way. This pass transforms all i64s in params and results in imports
+// and exports into pairs of i32, i32 (low, high). If JS on the outside
+// calls with that ABI, then everything should then just work, using
+// stub methods added in this pass, that thunk i64s into i32, i32 and
+// vice versa as necessary.
+//
+
+#include <wasm.h>
+#include <pass.h>
+#include <wasm-builder.h>
+#include <ast_utils.h>
+
+namespace wasm {
+
+Name TEMP_RET_0("tempRet0");
+
+struct LegalizeJSInterface : public Pass {
+ void run(PassRunner* runner, Module* module) override {
+ // for each illegal export, we must export a legalized stub instead
+ for (auto& ex : module->exports) {
+ if (ex->kind == Export::Function) {
+ // if it's an import, ignore it
+ if (auto* func = module->checkFunction(ex->value)) {
+ if (isIllegal(func)) {
+ auto legalName = makeLegalStub(func, module);
+ ex->value = legalName;
+ }
+ }
+ }
+ }
+ // for each illegal import, we must call a legalized stub instead
+ std::vector<Import*> newImports; // add them at the end, to not invalidate the iter
+ for (auto& im : module->imports) {
+ if (im->kind == Import::Function && isIllegal(im->functionType)) {
+ Name funcName;
+ auto* legal = makeLegalStub(im.get(), module, funcName);
+ illegalToLegal[im->name] = funcName;
+ newImports.push_back(legal);
+ }
+ }
+ if (illegalToLegal.size() > 0) {
+ for (auto* im : newImports) {
+ module->addImport(im);
+ }
+
+ // fix up imports: call_import of an illegal must be turned to a call of a legal
+
+ struct FixImports : public WalkerPass<PostWalker<FixImports, Visitor<FixImports>>> {
+ bool isFunctionParallel() override { return true; }
+
+ Pass* create() override { return new FixImports(illegalToLegal); }
+
+ std::map<Name, Name>* illegalToLegal;
+
+ FixImports(std::map<Name, Name>* illegalToLegal) : illegalToLegal(illegalToLegal) {}
+
+ void visitCallImport(CallImport* curr) {
+ auto iter = illegalToLegal->find(curr->target);
+ if (iter == illegalToLegal->end()) return;
+
+ if (iter->second == getFunction()->name) return; // inside the stub function itself, is the one safe place to do the call
+ replaceCurrent(Builder(*getModule()).makeCall(iter->second, curr->operands, curr->type));
+ }
+ };
+
+ PassRunner passRunner(module);
+ passRunner.add<FixImports>(&illegalToLegal);
+ passRunner.run();
+ }
+ }
+
+private:
+ // map of illegal to legal names for imports
+ std::map<Name, Name> illegalToLegal;
+
+ template<typename T>
+ bool isIllegal(T* t) {
+ for (auto param : t->params) {
+ if (param == i64) return true;
+ }
+ if (t->result == i64) return true;
+ return false;
+ }
+
+ // JS calls the export, so it must call a legal stub that calls the actual wasm function
+ Name makeLegalStub(Function* func, Module* module) {
+ Builder builder(*module);
+ auto* legal = new Function();
+ legal->name = Name(std::string("legalstub$") + func->name.str);
+
+ auto* call = module->allocator.alloc<Call>();
+ call->target = func->name;
+ call->type = func->result;
+
+ for (auto param : func->params) {
+ if (param == i64) {
+ call->operands.push_back(I64Utilities::recreateI64(builder, legal->params.size(), legal->params.size() + 1));
+ legal->params.push_back(i32);
+ legal->params.push_back(i32);
+ } else {
+ call->operands.push_back(builder.makeGetLocal(legal->params.size(), param));
+ legal->params.push_back(param);
+ }
+ }
+
+ if (func->result == i64) {
+ legal->result = i32;
+ auto index = builder.addVar(legal, Name(), i64);
+ auto* block = builder.makeBlock();
+ block->list.push_back(builder.makeSetLocal(index, call));
+ if (module->checkGlobal(TEMP_RET_0)) {
+ block->list.push_back(builder.makeSetGlobal(
+ TEMP_RET_0,
+ I64Utilities::getI64High(builder, index)
+ ));
+ } else {
+ block->list.push_back(builder.makeUnreachable()); // no way to emit the high bits :(
+ }
+ block->list.push_back(I64Utilities::getI64Low(builder, index));
+ block->finalize();
+ legal->body = block;
+ } else {
+ legal->result = func->result;
+ legal->body = call;
+ }
+
+ // a method may be exported multiple times
+ if (!module->checkFunction(legal->name)) {
+ module->addFunction(legal);
+ }
+ return legal->name;
+ }
+
+ // wasm calls the import, so it must call a stub that calls the actual legal JS import
+ Import* makeLegalStub(Import* im, Module* module, Name& funcName) {
+ Builder builder(*module);
+ auto* type = new FunctionType();
+ type->name = Name(std::string("legaltype$") + im->name.str);
+ auto* legal = new Import();
+ legal->name = Name(std::string("legalimport$") + im->name.str);
+ legal->module = im->module;
+ legal->base = im->base;
+ legal->kind = Import::Function;
+ legal->functionType = type;
+ auto* func = new Function();
+ func->name = Name(std::string("legalfunc$") + im->name.str);
+ funcName = func->name;
+
+ auto* call = module->allocator.alloc<CallImport>();
+ call->target = legal->name;
+
+ for (auto param : im->functionType->params) {
+ if (param == i64) {
+ call->operands.push_back(I64Utilities::getI64Low(builder, func->params.size()));
+ call->operands.push_back(I64Utilities::getI64High(builder, func->params.size()));
+ type->params.push_back(i32);
+ type->params.push_back(i32);
+ } else {
+ call->operands.push_back(builder.makeGetLocal(func->params.size(), param));
+ type->params.push_back(param);
+ }
+ func->params.push_back(param);
+ }
+
+ if (im->functionType->result == i64) {
+ call->type = i32;
+ Expression* get;
+ if (module->checkGlobal(TEMP_RET_0)) {
+ get = builder.makeGetGlobal(TEMP_RET_0, i32);
+ } else {
+ get = builder.makeUnreachable(); // no way to emit the high bits :(
+ }
+ func->body = I64Utilities::recreateI64(builder, call, get);
+ type->result = i32;
+ } else {
+ call->type = im->functionType->result;
+ func->body = call;
+ type->result = im->functionType->result;
+ }
+ func->result = im->functionType->result;
+
+ module->addFunction(func);
+ module->addFunctionType(type);
+ return legal;
+ }
+};
+
+Pass *createLegalizeJSInterfacePass() {
+ return new LegalizeJSInterface();
+}
+
+} // namespace wasm
+
diff --git a/src/passes/pass.cpp b/src/passes/pass.cpp
index f3bc6d4c7..ac5ad04c3 100644
--- a/src/passes/pass.cpp
+++ b/src/passes/pass.cpp
@@ -67,6 +67,7 @@ void PassRegistry::registerPasses() {
registerPass("dce", "removes unreachable code", createDeadCodeEliminationPass);
registerPass("duplicate-function-elimination", "removes duplicate functions", createDuplicateFunctionEliminationPass);
registerPass("extract-function", "leaves just one function (useful for debugging)", createExtractFunctionPass);
+ registerPass("legalize-js-interface", "legalizes i64 types on the import/export boundary", createLegalizeJSInterfacePass);
registerPass("merge-blocks", "merges blocks to their parents", createMergeBlocksPass);
registerPass("metrics", "reports metrics", createMetricsPass);
registerPass("nm", "name list", createNameListPass);
diff --git a/src/passes/passes.h b/src/passes/passes.h
index 80fa394e1..13193bc4c 100644
--- a/src/passes/passes.h
+++ b/src/passes/passes.h
@@ -27,7 +27,10 @@ Pass *createCoalesceLocalsWithLearningPass();
Pass *createDeadCodeEliminationPass();
Pass *createDuplicateFunctionEliminationPass();
Pass *createExtractFunctionPass();
+Pass *createFullPrinterPass();
+Pass *createLegalizeJSInterfacePass();
Pass *createLowerIfElsePass();
+Pass *createMinifiedPrinterPass();
Pass *createMergeBlocksPass();
Pass *createMetricsPass();
Pass *createNameListPass();
@@ -35,8 +38,6 @@ Pass *createNameManagerPass();
Pass *createOptimizeInstructionsPass();
Pass *createPostEmscriptenPass();
Pass *createPrinterPass();
-Pass *createMinifiedPrinterPass();
-Pass *createFullPrinterPass();
Pass *createRelooperJumpThreadingPass();
Pass *createRemoveImportsPass();
Pass *createRemoveMemoryPass();
generated by cgit v1.2.3 (git 2.39.1) at 2025-08-28 18:01:49 +0000