Expose a lower bound of malloc'd memory via heap statistics

test/cctest/wasm/test-run-wasm.cc

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <stdint.h>
 #include <stdlib.h>
 #include <string.h>
 
 #include "src/wasm/wasm-macro-gen.h"
 
@@ skipping 1696 matching lines @@
   BUILD(r,
         B2(WASM_BRV_IF(0, WASM_I8(45), WASM_GET_LOCAL(0)), WASM_INFINITE_LOOP));
   // Run the code, but don't go into the infinite loop.
   CHECK_EQ(45, r.Call(1));
 }
 
 
 static void TestBuildGraphForSimpleExpression(WasmOpcode opcode) {
   if (!WasmOpcodes::IsSupported(opcode)) return;
 
-  Zone zone;
+  ZoneForTesting zone;
   Isolate* isolate = CcTest::InitIsolateOnce();
   HandleScope scope(isolate);
   // Enable all optional operators.
   CommonOperatorBuilder common(&zone);
   MachineOperatorBuilder machine(&zone, MachineType::PointerRepresentation(),
                                  MachineOperatorBuilder::kAllOptionalOps);
   Graph graph(&zone);
   JSGraph jsgraph(isolate, &graph, &common, nullptr, nullptr, &machine);
   FunctionSig* sig = WasmOpcodes::Signature(opcode);
 
@@ skipping 406 matching lines @@
 #else
   static MachineType mixed[] = {
       MachineType::Int32(),   MachineType::Float32(), MachineType::Float64(),
       MachineType::Float32(), MachineType::Int32(),   MachineType::Float64(),
       MachineType::Float32(), MachineType::Float64(), MachineType::Int32(),
       MachineType::Int32(),   MachineType::Int32()};
 #endif
 
   int num_params = static_cast<int>(arraysize(mixed)) - start;
   for (int which = 0; which < num_params; which++) {
-    Zone zone;
+    ZoneForTesting zone;
     TestingModule module;
     module.AddMemory(1024);
     MachineType* memtypes = &mixed[start];
     MachineType result = memtypes[which];
 
     // =========================================================================
     // Build the selector function.
     // =========================================================================
     uint32_t index;
     FunctionSig::Builder b(&zone, 1, num_params);
@@ skipping 622 matching lines @@
   FOR_FLOAT32_INPUTS(i) {
     FOR_FLOAT32_INPUTS(j) { CHECK_FLOAT_EQ(copysign(*i, *j), r.Call(*i, *j)); }
   }
 }
 
 void CompileCallIndirectMany(LocalType param) {
   // Make sure we don't run out of registers when compiling indirect calls
   // with many many parameters.
   TestSignatures sigs;
   for (byte num_params = 0; num_params < 40; num_params++) {
-    Zone zone;
+    ZoneForTesting zone;
     HandleScope scope(CcTest::InitIsolateOnce());
     TestingModule module;
     FunctionSig* sig = sigs.many(&zone, kAstStmt, param, num_params);
 
     module.AddSignature(sig);
     module.AddSignature(sig);
     module.AddIndirectFunctionTable(nullptr, 0);
 
     WasmFunctionCompiler t(sig, &module);
 
@@ skipping 15 matching lines @@
 
 #if WASM_64
 TEST(Compile_Wasm_CallIndirect_Many_i64) { CompileCallIndirectMany(kAstI64); }
 #endif
 
 
 TEST(Compile_Wasm_CallIndirect_Many_f32) { CompileCallIndirectMany(kAstF32); }
 
 
 TEST(Compile_Wasm_CallIndirect_Many_f64) { CompileCallIndirectMany(kAstF64); }