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

test/cctest/wasm/test-run-wasm-module.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 <stdlib.h>
 #include <string.h>
 
 #include "src/wasm/encoder.h"
 #include "src/wasm/wasm-js.h"
 #include "src/wasm/wasm-macro-gen.h"
@@ skipping 51 matching lines @@
   HandleScope scope(isolate);
   WasmJs::InstallWasmFunctionMap(isolate, isolate->native_context());
   int32_t result =
       CompileAndRunWasmModule(isolate, data, data + arraysize(data));
   CHECK_EQ(99, result);
 }
 
 
 TEST(Run_WasmModule_Return114) {
   static const int32_t kReturnValue = 114;
-  Zone zone;
+  ZoneForTesting zone;
   WasmModuleBuilder* builder = new (&zone) WasmModuleBuilder(&zone);
   uint16_t f_index = builder->AddFunction();
   WasmFunctionBuilder* f = builder->FunctionAt(f_index);
   f->ReturnType(kAstI32);
   f->Exported(1);
   byte code[] = {WASM_I8(kReturnValue)};
   f->EmitCode(code, sizeof(code));
   WasmModuleWriter* writer = builder->Build(&zone);
   TestModule(writer->WriteTo(&zone), kReturnValue);
 }
 
 
 TEST(Run_WasmModule_CallAdd) {
-  Zone zone;
+  ZoneForTesting zone;
   WasmModuleBuilder* builder = new (&zone) WasmModuleBuilder(&zone);
   uint16_t f1_index = builder->AddFunction();
   WasmFunctionBuilder* f = builder->FunctionAt(f1_index);
   f->ReturnType(kAstI32);
   uint16_t param1 = f->AddParam(kAstI32);
   uint16_t param2 = f->AddParam(kAstI32);
   byte code1[] = {WASM_I32_ADD(WASM_GET_LOCAL(param1), WASM_GET_LOCAL(param2))};
   uint32_t local_indices1[] = {2, 4};
   f->EmitCode(code1, sizeof(code1), local_indices1, sizeof(local_indices1) / 4);
   uint16_t f2_index = builder->AddFunction();
   f = builder->FunctionAt(f2_index);
   f->ReturnType(kAstI32);
   f->Exported(1);
   byte code2[] = {WASM_CALL_FUNCTION(f1_index, WASM_I8(77), WASM_I8(22))};
   f->EmitCode(code2, sizeof(code2));
   WasmModuleWriter* writer = builder->Build(&zone);
   TestModule(writer->WriteTo(&zone), 99);
 }
 
 
 TEST(Run_WasmModule_ReadLoadedDataSegment) {
   static const byte kDataSegmentDest0 = 12;
-  Zone zone;
+  ZoneForTesting zone;
   WasmModuleBuilder* builder = new (&zone) WasmModuleBuilder(&zone);
   uint16_t f_index = builder->AddFunction();
   WasmFunctionBuilder* f = builder->FunctionAt(f_index);
   f->ReturnType(kAstI32);
   f->Exported(1);
   byte code[] = {
       WASM_LOAD_MEM(MachineType::Int32(), WASM_I8(kDataSegmentDest0))};
   f->EmitCode(code, sizeof(code));
   byte data[] = {0xaa, 0xbb, 0xcc, 0xdd};
   builder->AddDataSegment(new (&zone) WasmDataSegmentEncoder(
       &zone, data, sizeof(data), kDataSegmentDest0));
   WasmModuleWriter* writer = builder->Build(&zone);
   TestModule(writer->WriteTo(&zone), 0xddccbbaa);
 }
 
 TEST(Run_WasmModule_CheckMemoryIsZero) {
   static const int kCheckSize = 16 * 1024;
-  Zone zone;
+  ZoneForTesting zone;
   WasmModuleBuilder* builder = new (&zone) WasmModuleBuilder(&zone);
   uint16_t f_index = builder->AddFunction();
   WasmFunctionBuilder* f = builder->FunctionAt(f_index);
   f->ReturnType(kAstI32);
   uint16_t localIndex = f->AddLocal(kAstI32);
   f->Exported(1);
   byte code[] = {WASM_BLOCK(
       2,
       WASM_WHILE(
           WASM_I32_LTS(WASM_GET_LOCAL(localIndex), WASM_I32V_3(kCheckSize)),
           WASM_IF_ELSE(
               WASM_LOAD_MEM(MachineType::Int32(), WASM_GET_LOCAL(localIndex)),
               WASM_BRV(2, WASM_I8(-1)), WASM_INC_LOCAL_BY(localIndex, 4))),
       WASM_I8(11))};
   f->EmitCode(code, sizeof(code), nullptr, 0);
   WasmModuleWriter* writer = builder->Build(&zone);
   TestModule(writer->WriteTo(&zone), 11);
 }
 
 TEST(Run_WasmModule_CallMain_recursive) {
-  Zone zone;
+  ZoneForTesting zone;
   WasmModuleBuilder* builder = new (&zone) WasmModuleBuilder(&zone);
   uint16_t f_index = builder->AddFunction();
   WasmFunctionBuilder* f = builder->FunctionAt(f_index);
   f->ReturnType(kAstI32);
   uint16_t localIndex = f->AddLocal(kAstI32);
   f->Exported(1);
   byte code[] = {WASM_BLOCK(
       2, WASM_SET_LOCAL(localIndex,
                         WASM_LOAD_MEM(MachineType::Int32(), WASM_ZERO)),
       WASM_IF_ELSE(WASM_I32_LTS(WASM_GET_LOCAL(localIndex), WASM_I8(5)),
                    WASM_BLOCK(2, WASM_STORE_MEM(MachineType::Int32(), WASM_ZERO,
                                                 WASM_INC_LOCAL(localIndex)),
                               WASM_BRV(1, WASM_CALL_FUNCTION0(0))),
                    WASM_BRV(0, WASM_I8(55))))};
   f->EmitCode(code, sizeof(code), nullptr, 0);
   WasmModuleWriter* writer = builder->Build(&zone);
   TestModule(writer->WriteTo(&zone), 55);
 }
 
 TEST(Run_WasmModule_Global) {
-  Zone zone;
+  ZoneForTesting zone;
   WasmModuleBuilder* builder = new (&zone) WasmModuleBuilder(&zone);
   uint32_t global1 = builder->AddGlobal(MachineType::Int32(), 0);
   uint32_t global2 = builder->AddGlobal(MachineType::Int32(), 0);
   uint16_t f1_index = builder->AddFunction();
   WasmFunctionBuilder* f = builder->FunctionAt(f1_index);
   f->ReturnType(kAstI32);
   byte code1[] = {
       WASM_I32_ADD(WASM_LOAD_GLOBAL(global1), WASM_LOAD_GLOBAL(global2))};
   f->EmitCode(code1, sizeof(code1));
   uint16_t f2_index = builder->AddFunction();
   f = builder->FunctionAt(f2_index);
   f->ReturnType(kAstI32);
   f->Exported(1);
   byte code2[] = {WASM_STORE_GLOBAL(global1, WASM_I32V_1(56)),
                   WASM_STORE_GLOBAL(global2, WASM_I32V_1(41)),
                   WASM_RETURN(WASM_CALL_FUNCTION0(f1_index))};
   f->EmitCode(code2, sizeof(code2));
   WasmModuleWriter* writer = builder->Build(&zone);
   TestModule(writer->WriteTo(&zone), 97);
 }