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-rw-r--r--src/ir/CMakeLists.txt1
-rw-r--r--src/ir/memory-utils.cpp72
-rw-r--r--src/ir/memory-utils.h40
-rw-r--r--src/tools/wasm-ctor-eval.cpp43
4 files changed, 99 insertions, 57 deletions
diff --git a/src/ir/CMakeLists.txt b/src/ir/CMakeLists.txt
index 08149e15e..5b6417091 100644
--- a/src/ir/CMakeLists.txt
+++ b/src/ir/CMakeLists.txt
@@ -5,6 +5,7 @@ set(ir_SOURCES
eh-utils.cpp
intrinsics.cpp
lubs.cpp
+ memory-utils.cpp
names.cpp
properties.cpp
LocalGraph.cpp
diff --git a/src/ir/memory-utils.cpp b/src/ir/memory-utils.cpp
new file mode 100644
index 000000000..b7c92fe9e
--- /dev/null
+++ b/src/ir/memory-utils.cpp
@@ -0,0 +1,72 @@
+/*
+ * Copyright 2022 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.
+ */
+
+#include "ir/memory-utils.h"
+#include "wasm.h"
+
+namespace wasm::MemoryUtils {
+
+bool flatten(Module& wasm) {
+ // The presence of any MemoryInit instructions is a problem because they care
+ // about segment identity, which flattening gets rid of ( when it merges them
+ // all into one big segment).
+ ModuleUtils::ParallelFunctionAnalysis<bool> analysis(
+ wasm, [&](Function* func, bool& hasMemoryInit) {
+ if (func->imported()) {
+ return;
+ }
+ hasMemoryInit = FindAll<MemoryInit>(func->body).list.size() > 0;
+ });
+
+ for (auto& [func, hasMemoryInit] : analysis.map) {
+ if (hasMemoryInit) {
+ return false;
+ }
+ }
+
+ auto& memory = wasm.memory;
+
+ if (memory.segments.size() == 0) {
+ return true;
+ }
+
+ std::vector<char> data;
+ for (auto& segment : memory.segments) {
+ if (segment.isPassive) {
+ return false;
+ }
+ auto* offset = segment.offset->dynCast<Const>();
+ if (!offset) {
+ return false;
+ }
+ }
+ for (auto& segment : memory.segments) {
+ auto* offset = segment.offset->dynCast<Const>();
+ Index start = offset->value.getInteger();
+ Index end = start + segment.data.size();
+ if (end > data.size()) {
+ data.resize(end);
+ }
+ std::copy(segment.data.begin(), segment.data.end(), data.begin() + start);
+ }
+ memory.segments.resize(1);
+ memory.segments[0].offset->cast<Const>()->value = Literal(int32_t(0));
+ memory.segments[0].data.swap(data);
+
+ return true;
+}
+
+} // namespace wasm::MemoryUtils
diff --git a/src/ir/memory-utils.h b/src/ir/memory-utils.h
index 3a0862cd7..9b3325329 100644
--- a/src/ir/memory-utils.h
+++ b/src/ir/memory-utils.h
@@ -29,46 +29,8 @@ namespace wasm::MemoryUtils {
// Flattens memory into a single data segment, or no segment. If there is
// a segment, it starts at 0.
-// If ensuredSegmentSize is provided, then a segment is always emitted,
-// and of at least that size.
// Returns true if successful (e.g. relocatable segments cannot be flattened).
-inline bool flatten(Memory& memory,
- Index ensuredSegmentSize = 0,
- Module* module = nullptr) {
- if (memory.segments.size() == 0) {
- if (ensuredSegmentSize > 0) {
- assert(module); // must provide a module if ensuring a size.
- Builder builder(*module);
- memory.segments.emplace_back(builder.makeConst(int32_t(0)));
- memory.segments[0].data.resize(ensuredSegmentSize);
- }
- return true;
- }
- std::vector<char> data;
- data.resize(ensuredSegmentSize);
- for (auto& segment : memory.segments) {
- if (segment.isPassive) {
- return false;
- }
- auto* offset = segment.offset->dynCast<Const>();
- if (!offset) {
- return false;
- }
- }
- for (auto& segment : memory.segments) {
- auto* offset = segment.offset->dynCast<Const>();
- Index start = offset->value.getInteger();
- Index end = start + segment.data.size();
- if (end > data.size()) {
- data.resize(end);
- }
- std::copy(segment.data.begin(), segment.data.end(), data.begin() + start);
- }
- memory.segments.resize(1);
- memory.segments[0].offset->cast<Const>()->value = Literal(int32_t(0));
- memory.segments[0].data.swap(data);
- return true;
-}
+bool flatten(Module& wasm);
// Ensures that the memory exists (of minimal size).
inline void ensureExists(Memory& memory) {
diff --git a/src/tools/wasm-ctor-eval.cpp b/src/tools/wasm-ctor-eval.cpp
index e6883e351..3923d137c 100644
--- a/src/tools/wasm-ctor-eval.cpp
+++ b/src/tools/wasm-ctor-eval.cpp
@@ -663,11 +663,6 @@ void evalCtors(Module& wasm,
CtorEvalExternalInterface interface(linkedInstances);
try {
- // flatten memory, so we do not depend on the layout of data segments
- if (!MemoryUtils::flatten(wasm.memory)) {
- Fatal() << " ...stopping since could not flatten memory\n";
- }
-
// create an instance for evalling
EvallingModuleInstance instance(wasm, &interface, linkedInstances);
// we should not add new globals from here on; as a result, using
@@ -712,6 +707,16 @@ void evalCtors(Module& wasm,
}
}
+static bool canEval(Module& wasm) {
+ // Check if we can flatten memory. We need to do so currently because of how
+ // we assume memory is simple and flat. TODO
+ if (!MemoryUtils::flatten(wasm)) {
+ std::cout << " ...stopping since could not flatten memory\n";
+ return false;
+ }
+ return true;
+}
+
} // anonymous namespace
//
@@ -808,19 +813,21 @@ int main(int argc, const char* argv[]) {
Fatal() << "error in validating input";
}
- evalCtors(wasm, ctors, keptExports);
-
- // Do some useful optimizations after the evalling
- {
- PassRunner passRunner(&wasm);
- passRunner.add("memory-packing"); // we flattened it, so re-optimize
- // TODO: just do -Os for the one function
- passRunner.add("remove-unused-names");
- passRunner.add("dce");
- passRunner.add("merge-blocks");
- passRunner.add("vacuum");
- passRunner.add("remove-unused-module-elements");
- passRunner.run();
+ if (canEval(wasm)) {
+ evalCtors(wasm, ctors, keptExports);
+
+ // Do some useful optimizations after the evalling
+ {
+ PassRunner passRunner(&wasm);
+ passRunner.add("memory-packing"); // we flattened it, so re-optimize
+ // TODO: just do -Os for the one function
+ passRunner.add("remove-unused-names");
+ passRunner.add("dce");
+ passRunner.add("merge-blocks");
+ passRunner.add("vacuum");
+ passRunner.add("remove-unused-module-elements");
+ passRunner.run();
+ }
}
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