[tracing] Add memory maps dumper impl for Linux/Android

base/trace_event/process_memory_maps_dump_provider_unittest.cc

 // Copyright 2015 The Chromium 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 "base/trace_event/process_memory_maps_dump_provider.h"
 
 #include <fstream>
 #include <sstream>
 
 #include "base/trace_event/process_memory_dump.h"
 #include "base/trace_event/process_memory_maps.h"
 #include "base/trace_event/trace_event_argument.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
+namespace {
+const char kTestSmaps1[] =
+    "00400000-004be000 r-xp 00000000 fc:01 1234              /file/1\n"
+    "Size:                760 kB\n"
+    "Rss:                 296 kB\n"
+    "Pss:                 162 kB\n"
+    "Shared_Clean:        228 kB\n"
+    "Shared_Dirty:          0 kB\n"
+    "Private_Clean:         0 kB\n"
+    "Private_Dirty:        68 kB\n"
+    "Referenced:          296 kB\n"
+    "Anonymous:            68 kB\n"
+    "AnonHugePages:         0 kB\n"
+    "Swap:                  0 kB\n"
+    "KernelPageSize:        4 kB\n"
+    "MMUPageSize:           4 kB\n"
+    "Locked:                0 kB\n"
+    "VmFlags: rd ex mr mw me dw sd\n"
+    "ff000000-ff800000 -w-p 00001080 fc:01 0            /file/name with space\n"
+    "Size:                  0 kB\n"
+    "Rss:                 128 kB\n"
+    "Pss:                 128 kB\n"
+    "Shared_Clean:        124 kB\n"
+    "Shared_Dirty:          0 kB\n"
+    "Private_Clean:        68 kB\n"
+    "Private_Dirty:         0 kB\n"
+    "Referenced:          296 kB\n"
+    "Anonymous:             0 kB\n"
+    "AnonHugePages:         0 kB\n"
+    "Swap:                  0 kB\n"
+    "KernelPageSize:        4 kB\n"
+    "MMUPageSize:           4 kB\n"
+    "Locked:                0 kB\n"
+    "VmFlags: rd ex mr mw me dw sd";
+
+const char kTestSmaps2[] =
+    "7fe7ce79c000-7fe7ce7a8000 ---p 00000000 00:00 0 \n"  // An anonymous vma.
+    "Size:                 48 kB\n"
+    "Rss:                  40 kB\n"
+    "Pss:                   0 kB\n"
+    "Shared_Clean:         16 kB\n"
+    "Shared_Dirty:         12 kB\n"
+    "Private_Clean:         8 kB\n"
+    "Private_Dirty:         4 kB\n"
+    "Referenced:           40 kB\n"
+    "Anonymous:            16 kB\n"
+    "AnonHugePages:         0 kB\n"
+    "Swap:                  0 kB\n"
+    "KernelPageSize:        4 kB\n"
+    "MMUPageSize:           4 kB\n"
+    "Locked:                0 kB\n"
+    "VmFlags: rd wr mr mw me ac sd";
+}  // namespace

[Sami, 2015/02/24 11:11:25]

Could you add a couple of malformed examples (empty file, one with a
negative/zero region size)?

[Primiano Tucci (use gerrit), 2015/02/24 13:17:07]

Done for negative zero. Empty file, instead, is a legitimate case (anonymous
memory)

+
 namespace base {
 namespace trace_event {
 
 #if defined(OS_LINUX) || defined(OS_ANDROID)
 TEST(ProcessMemoryMapsDumpProviderTest, ParseProcSmaps) {
+  const uint32 kProtR = ProcessMemoryMaps::VMRegion::kProtectionFlagsRead;
+  const uint32 kProtW = ProcessMemoryMaps::VMRegion::kProtectionFlagsWrite;
+  const uint32 kProtX = ProcessMemoryMaps::VMRegion::kProtectionFlagsExec;
+
   auto pmmdp = ProcessMemoryMapsDumpProvider::GetInstance();
 
   // Emulate a non-existent /proc/self/smaps.
   ProcessMemoryDump pmd_invalid;
   std::ifstream non_existent_file("/tmp/does-not-exist");
   ProcessMemoryMapsDumpProvider::proc_smaps_for_testing = &non_existent_file;
   CHECK_EQ(false, non_existent_file.good());
   pmmdp->DumpInto(&pmd_invalid);
   ASSERT_FALSE(pmd_invalid.has_process_mmaps());
 
   // Emulate an empty /proc/self/smaps.
   std::ifstream empty_file("/dev/null");
   ProcessMemoryMapsDumpProvider::proc_smaps_for_testing = &empty_file;
   CHECK_EQ(true, empty_file.good());
   pmmdp->DumpInto(&pmd_invalid);
   ASSERT_FALSE(pmd_invalid.has_process_mmaps());
 
-  // TODO(primiano): in the next CLs add the code to parse some actual smaps
-  // files and check that the parsing logic of the dump provider holds.
+  // Parse the 1st smaps file.
+  ProcessMemoryDump pmd_1;
+  std::istringstream test_smaps_1(kTestSmaps1);
+  ProcessMemoryMapsDumpProvider::proc_smaps_for_testing = &test_smaps_1;
+  pmmdp->DumpInto(&pmd_1);
+  ASSERT_TRUE(pmd_1.has_process_mmaps());
+  const auto& regions_1 = pmd_1.process_mmaps()->vm_regions();
+  ASSERT_EQ(2UL, regions_1.size());
+
+  EXPECT_EQ(0x00400000UL, regions_1[0].start_address);
+  EXPECT_EQ(0x004be000UL - 0x00400000UL, regions_1[0].size_in_bytes);
+  EXPECT_EQ(kProtR | kProtX, regions_1[0].protection_flags);
+  EXPECT_EQ("/file/1", regions_1[0].mapped_file);
+  EXPECT_EQ(0UL, regions_1[0].mapped_file_offset);
+  EXPECT_EQ(296 * 1024UL, regions_1[0].byte_stats_resident);
+  EXPECT_EQ(68 * 1024UL, regions_1[0].byte_stats_anonymous);
+
+  EXPECT_EQ(0xff000000UL, regions_1[1].start_address);
+  EXPECT_EQ(0xff800000UL - 0xff000000UL, regions_1[1].size_in_bytes);
+  EXPECT_EQ(kProtW, regions_1[1].protection_flags);
+  EXPECT_EQ("/file/name with space", regions_1[1].mapped_file);
+  EXPECT_EQ(0x00001080UL, regions_1[1].mapped_file_offset);
+  EXPECT_EQ(128 * 1024UL, regions_1[1].byte_stats_resident);
+  EXPECT_EQ(0UL, regions_1[1].byte_stats_anonymous);
+
+  // Parse the 2nd smaps file.
+  ProcessMemoryDump pmd_2;
+  std::istringstream test_smaps_2(kTestSmaps2);
+  ProcessMemoryMapsDumpProvider::proc_smaps_for_testing = &test_smaps_2;
+  pmmdp->DumpInto(&pmd_2);
+  ASSERT_TRUE(pmd_2.has_process_mmaps());
+  const auto& regions_2 = pmd_2.process_mmaps()->vm_regions();
+  ASSERT_EQ(1UL, regions_2.size());
+  EXPECT_EQ(0x7fe7ce79c000UL, regions_2[0].start_address);
+  EXPECT_EQ(0x7fe7ce7a8000UL - 0x7fe7ce79c000UL, regions_2[0].size_in_bytes);
+  EXPECT_EQ(0U, regions_2[0].protection_flags);
+  EXPECT_EQ("", regions_2[0].mapped_file);
+  EXPECT_EQ(0UL, regions_2[0].mapped_file_offset);
+  EXPECT_EQ(40 * 1024UL, regions_2[0].byte_stats_resident);
+  EXPECT_EQ(16 * 1024UL, regions_2[0].byte_stats_anonymous);
 }
 #endif  // defined(OS_LINUX) || defined(OS_ANDROID)
 
 }  // namespace trace_event
 }  // namespace base