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/*
* Copyright 2017 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.
*/
//
// Instruments the build with code to intercept all local reads and writes.
//
// gets:
//
// Before:
// (local.get $x)
//
// After:
// (call $get_TYPE
// (i32.const n) // call id
// (i32.const n) // local id
// (local.get $x)
// )
//
// sets:
//
// Before:
// (local.set $x (i32.const 1))
//
// After:
// (local.set $x
// (call $set_TYPE
// (i32.const n) // call id
// (i32.const n) // local id
// (i32.const 1) // value
// )
// )
#include "asm_v_wasm.h"
#include "asmjs/shared-constants.h"
#include "ir/function-type-utils.h"
#include "shared-constants.h"
#include <pass.h>
#include <wasm-builder.h>
#include <wasm.h>
namespace wasm {
Name get_i32("get_i32");
Name get_i64("get_i64");
Name get_f32("get_f32");
Name get_f64("get_f64");
Name get_anyref("get_anyref");
Name get_exnref("get_exnref");
Name set_i32("set_i32");
Name set_i64("set_i64");
Name set_f32("set_f32");
Name set_f64("set_f64");
Name set_anyref("set_anyref");
Name set_exnref("set_exnref");
struct InstrumentLocals : public WalkerPass<PostWalker<InstrumentLocals>> {
void visitLocalGet(LocalGet* curr) {
Builder builder(*getModule());
Name import;
switch (curr->type) {
case i32:
import = get_i32;
break;
case i64:
return; // TODO
case f32:
import = get_f32;
break;
case f64:
import = get_f64;
break;
case v128:
assert(false && "v128 not implemented yet");
case anyref:
import = get_anyref;
break;
case exnref:
import = get_exnref;
break;
case none:
case unreachable:
WASM_UNREACHABLE("unexpected type");
}
replaceCurrent(
builder.makeCall(import,
{builder.makeConst(Literal(int32_t(id++))),
builder.makeConst(Literal(int32_t(curr->index))),
curr},
curr->type));
}
void visitLocalSet(LocalSet* curr) {
// We don't instrument pop instructions. They are automatically deleted when
// writing binary and generated when reading binary, so they don't work with
// local set/get instrumentation.
if (curr->value->is<Pop>()) {
return;
}
Builder builder(*getModule());
Name import;
switch (curr->value->type) {
case i32:
import = set_i32;
break;
case i64:
return; // TODO
case f32:
import = set_f32;
break;
case f64:
import = set_f64;
break;
case v128:
assert(false && "v128 not implemented yet");
case anyref:
import = set_anyref;
break;
case exnref:
import = set_exnref;
break;
case unreachable:
return; // nothing to do here
case none:
WASM_UNREACHABLE("unexpected type");
}
curr->value =
builder.makeCall(import,
{builder.makeConst(Literal(int32_t(id++))),
builder.makeConst(Literal(int32_t(curr->index))),
curr->value},
curr->value->type);
}
void visitModule(Module* curr) {
addImport(curr, get_i32, "iiii");
addImport(curr, get_i64, "jiij");
addImport(curr, get_f32, "fiif");
addImport(curr, get_f64, "diid");
addImport(curr, set_i32, "iiii");
addImport(curr, set_i64, "jiij");
addImport(curr, set_f32, "fiif");
addImport(curr, set_f64, "diid");
if (curr->features.hasReferenceTypes()) {
addImport(curr, get_anyref, "aiia");
addImport(curr, set_anyref, "aiia");
}
if (curr->features.hasExceptionHandling()) {
addImport(curr, get_exnref, "eiie");
addImport(curr, set_exnref, "eiie");
}
}
private:
Index id = 0;
void addImport(Module* wasm, Name name, std::string sig) {
auto import = new Function;
import->name = name;
import->module = ENV;
import->base = name;
auto* functionType = ensureFunctionType(sig, wasm);
import->type = functionType->name;
FunctionTypeUtils::fillFunction(import, functionType);
wasm->addFunction(import);
}
};
Pass* createInstrumentLocalsPass() { return new InstrumentLocals(); }
} // namespace wasm
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