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/*
* 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.
*/
#ifndef wasm_wasm_emscripten_h
#define wasm_wasm_emscripten_h
#include "support/file.h"
#include "wasm-builder.h"
#include "wasm.h"
namespace wasm {
Global* getStackPointerGlobal(Module& wasm);
// Class which modifies a wasm module for use with emscripten. Generates
// runtime functions and emits metadata.
class EmscriptenGlueGenerator {
public:
EmscriptenGlueGenerator(Module& wasm, Address stackPointerOffset = Address(0))
: wasm(wasm), builder(wasm), stackPointerOffset(stackPointerOffset),
useStackPointerGlobal(stackPointerOffset == 0) {}
Function* generateMemoryGrowthFunction();
Function* generateAssignGOTEntriesFunction();
void generatePostInstantiateFunction();
// Remove the import of a mutable __stack_pointer and instead initialize the
// stack pointer from an immutable import.
void internalizeStackPointerGlobal();
std::string
generateEmscriptenMetadata(Address staticBump,
std::vector<Name> const& initializerFunctions);
void fixInvokeFunctionNames();
// clang uses name mangling to rename the argc/argv form of main to
// __main_argc_argv. Emscripten in non-standalone mode expects that function
// to be exported as main. This function renames __main_argc_argv to main
// as expected by emscripten.
void renameMainArgcArgv();
// Emits the data segments to a file. The file contains data from address base
// onwards (we must pass in base, as we can't tell it from the wasm - the
// first segment may start after a run of zeros, but we need those zeros in
// the file).
void separateDataSegments(Output* outfile, Address base);
void generateDynCallThunk(Signature sig);
bool standalone = false;
bool sideModule = false;
bool minimizeWasmChanges = false;
bool noDynCalls = false;
bool onlyI64DynCalls = false;
private:
Module& wasm;
Builder builder;
Address stackPointerOffset;
bool useStackPointerGlobal;
// Used by generateDynCallThunk to track all the dynCall functions created
// so far.
std::unordered_set<Signature> sigs;
};
} // namespace wasm
#endif // wasm_wasm_emscripten_h
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