Make gyp work with Cygwin

Review URL: https://codereview.chromium.org/13760003

Patch from Haitao Feng <haitao.feng@intel.com>.

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@14282 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/platform-cygwin.cc

@@ -194,6 +194,11 @@ void OS::DebugBreak() {
 }
 
 
+void OS::DumpBacktrace() {
+  // Currently unsupported.
+}
+
+
 class PosixMemoryMappedFile : public OS::MemoryMappedFile {
  public:
   PosixMemoryMappedFile(FILE* file, void* memory, int size)
@@ -319,6 +324,50 @@ int OS::StackWalk(Vector<OS::StackFrame> frames) {
 // This causes VirtualMemory::Commit to not always commit the memory region
 // specified.
 
+static void* GetRandomAddr() {
+  Isolate* isolate = Isolate::UncheckedCurrent();
+  // Note that the current isolate isn't set up in a call path via
+  // CpuFeatures::Probe. We don't care about randomization in this case because
+  // the code page is immediately freed.
+  if (isolate != NULL) {
+    // The address range used to randomize RWX allocations in OS::Allocate
+    // Try not to map pages into the default range that windows loads DLLs
+    // Use a multiple of 64k to prevent committing unused memory.
+    // Note: This does not guarantee RWX regions will be within the
+    // range kAllocationRandomAddressMin to kAllocationRandomAddressMax
+#ifdef V8_HOST_ARCH_64_BIT
+    static const intptr_t kAllocationRandomAddressMin = 0x0000000080000000;
+    static const intptr_t kAllocationRandomAddressMax = 0x000003FFFFFF0000;
+#else
+    static const intptr_t kAllocationRandomAddressMin = 0x04000000;
+    static const intptr_t kAllocationRandomAddressMax = 0x3FFF0000;
+#endif
+    uintptr_t address = (V8::RandomPrivate(isolate) << kPageSizeBits)
+        | kAllocationRandomAddressMin;
+    address &= kAllocationRandomAddressMax;
+    return reinterpret_cast<void *>(address);
+  }
+  return NULL;
+}
+
+
+static void* RandomizedVirtualAlloc(size_t size, int action, int protection) {
+  LPVOID base = NULL;
+
+  if (protection == PAGE_EXECUTE_READWRITE || protection == PAGE_NOACCESS) {
+    // For exectutable pages try and randomize the allocation address
+    for (size_t attempts = 0; base == NULL && attempts < 3; ++attempts) {
+      base = VirtualAlloc(GetRandomAddr(), size, action, protection);
+    }
+  }
+
+  // After three attempts give up and let the OS find an address to use.
+  if (base == NULL) base = VirtualAlloc(NULL, size, action, protection);
+
+  return base;
+}
+
+
 VirtualMemory::VirtualMemory() : address_(NULL), size_(0) { }
 
 
@@ -326,9 +375,37 @@ VirtualMemory::VirtualMemory(size_t size)
     : address_(ReserveRegion(size)), size_(size) { }
 
 
+VirtualMemory::VirtualMemory(size_t size, size_t alignment)
+    : address_(NULL), size_(0) {
+  ASSERT(IsAligned(alignment, static_cast<intptr_t>(OS::AllocateAlignment())));
+  size_t request_size = RoundUp(size + alignment,
+                                static_cast<intptr_t>(OS::AllocateAlignment()));
+  void* address = ReserveRegion(request_size);
+  if (address == NULL) return;
+  Address base = RoundUp(static_cast<Address>(address), alignment);
+  // Try reducing the size by freeing and then reallocating a specific area.
+  bool result = ReleaseRegion(address, request_size);
+  USE(result);
+  ASSERT(result);
+  address = VirtualAlloc(base, size, MEM_RESERVE, PAGE_NOACCESS);
+  if (address != NULL) {
+    request_size = size;
+    ASSERT(base == static_cast<Address>(address));
+  } else {
+    // Resizing failed, just go with a bigger area.
+    address = ReserveRegion(request_size);
+    if (address == NULL) return;
+  }
+  address_ = address;
+  size_ = request_size;
+}
+
+
 VirtualMemory::~VirtualMemory() {
   if (IsReserved()) {
-    if (0 == VirtualFree(address(), 0, MEM_RELEASE)) address_ = NULL;
+    bool result = ReleaseRegion(address_, size_);
+    ASSERT(result);
+    USE(result);
   }
 }
 
@@ -345,19 +422,29 @@ void VirtualMemory::Reset() {
 
 
 bool VirtualMemory::Commit(void* address, size_t size, bool is_executable) {
-  int prot = is_executable ? PAGE_EXECUTE_READWRITE : PAGE_READWRITE;
-  if (NULL == VirtualAlloc(address, size, MEM_COMMIT, prot)) {
-    return false;
-  }
-
-  UpdateAllocatedSpaceLimits(address, static_cast<int>(size));
-  return true;
+  return CommitRegion(address, size, is_executable);
 }
 
 
 bool VirtualMemory::Uncommit(void* address, size_t size) {
   ASSERT(IsReserved());
-  return VirtualFree(address, size, MEM_DECOMMIT) != false;
+  return UncommitRegion(address, size);
+}
+
+
+void* VirtualMemory::ReserveRegion(size_t size) {
+  return RandomizedVirtualAlloc(size, MEM_RESERVE, PAGE_NOACCESS);
+}
+
+
+bool VirtualMemory::CommitRegion(void* base, size_t size, bool is_executable) {
+  int prot = is_executable ? PAGE_EXECUTE_READWRITE : PAGE_READWRITE;
+  if (NULL == VirtualAlloc(base, size, MEM_COMMIT, prot)) {
+    return false;
+  }
+
+  UpdateAllocatedSpaceLimits(base, static_cast<int>(size));
+  return true;
 }
 
 
@@ -372,26 +459,13 @@ bool VirtualMemory::Guard(void* address) {
 }
 
 
-void* VirtualMemory::ReserveRegion(size_t size) {
-  return VirtualAlloc(NULL, size, MEM_RESERVE, PAGE_NOACCESS);
-}
-
-
-bool VirtualMemory::CommitRegion(void* base, size_t size, bool is_executable) {
-  UNIMPLEMENTED();
-  return false;
-}
-
-
 bool VirtualMemory::UncommitRegion(void* base, size_t size) {
-  UNIMPLEMENTED();
-  return false;
+  return VirtualFree(base, size, MEM_DECOMMIT) != 0;
 }
 
 
 bool VirtualMemory::ReleaseRegion(void* base, size_t size) {
-  UNIMPLEMENTED();
-  return false;
+  return VirtualFree(base, 0, MEM_RELEASE) != 0;
 }
 
 
@@ -408,8 +482,6 @@ class Thread::PlatformData : public Malloced {
 };
 
 
-
-
 Thread::Thread(const Options& options)
     : data_(new PlatformData()),
       stack_size_(options.stack_size()),

src/platform.h

@@ -91,8 +91,10 @@ inline int lrint(double flt) {
 
 #endif  // _MSC_VER
 
+#ifndef __CYGWIN__
 // Random is missing on both Visual Studio and MinGW.
 int random();
+#endif
 
 #endif  // WIN32
 

test/cctest/test-api.cc

@@ -48,14 +48,6 @@
 
 static const bool kLogThreading = false;
 
-static bool IsNaN(double x) {
-#ifdef WIN32
-  return _isnan(x);
-#else
-  return isnan(x);
-#endif
-}
-
 using ::v8::AccessorInfo;
 using ::v8::Arguments;
 using ::v8::Context;
@@ -3648,7 +3640,7 @@ THREADED_TEST(ConversionException) {
   CheckUncle(&try_catch);
 
   double number_value = obj->NumberValue();
-  CHECK_NE(0, IsNaN(number_value));
+  CHECK_NE(0, isnan(number_value));
   CheckUncle(&try_catch);
 
   int64_t integer_value = obj->IntegerValue();
@@ -15749,7 +15741,7 @@ static uint64_t DoubleToBits(double value) {
 
 static double DoubleToDateTime(double input) {
   double date_limit = 864e13;
-  if (IsNaN(input) || input < -date_limit || input > date_limit) {
+  if (isnan(input) || input < -date_limit || input > date_limit) {
     return i::OS::nan_value();
   }
   return (input < 0) ? -(floor(-input)) : floor(input);
@@ -15810,7 +15802,7 @@ THREADED_TEST(QuietSignalingNaNs) {
     // Check that Number::New preserves non-NaNs and quiets SNaNs.
     v8::Handle<v8::Value> number = v8::Number::New(test_value);
     double stored_number = number->NumberValue();
-    if (!IsNaN(test_value)) {
+    if (!isnan(test_value)) {
       CHECK_EQ(test_value, stored_number);
     } else {
       uint64_t stored_bits = DoubleToBits(stored_number);
@@ -15829,7 +15821,7 @@ THREADED_TEST(QuietSignalingNaNs) {
     v8::Handle<v8::Value> date = v8::Date::New(test_value);
     double expected_stored_date = DoubleToDateTime(test_value);
     double stored_date = date->NumberValue();
-    if (!IsNaN(expected_stored_date)) {
+    if (!isnan(expected_stored_date)) {
       CHECK_EQ(expected_stored_date, stored_date);
     } else {
       uint64_t stored_bits = DoubleToBits(stored_date);

tools/gyp/v8.gyp

@@ -752,17 +752,34 @@
               'variables': {
                 'gyp_generators': '<!(echo $GYP_GENERATORS)',
               },
-              'sources': [
-                '../../src/platform-win32.cc',
-                '../../src/win32-math.cc',
-                '../../src/win32-math.h',
-              ],
               'conditions': [
                 ['gyp_generators=="make"', {
+                  'variables': {
+                    'build_env': '<!(uname -o)',
+                  },
+                  'conditions': [
+                    ['build_env=="Cygwin"', {
+                      'sources': [
+                        '../../src/platform-cygwin.cc',
+                        '../../src/platform-posix.cc',
+                      ],
+                    }, {
+                      'sources': [
+                        '../../src/platform-win32.cc',
+                        '../../src/win32-math.h',
+                        '../../src/win32-math.cc',
+                      ],
+                    }],
+                  ],
                   'link_settings':  {
                     'libraries': [ '-lwinmm', '-lws2_32' ],
                   },
                 }, {
+                  'sources': [
+                    '../../src/platform-win32.cc',
+                    '../../src/win32-math.h',
+                    '../../src/win32-math.cc',
+                  ],
                   'msvs_disabled_warnings': [4351, 4355, 4800],
                   'link_settings':  {
                     'libraries': [ '-lwinmm.lib', '-lws2_32.lib' ],