Attachment 359270 Details for Bug 193496 – Patch

[patch] Patch

bug-193496-20190116091942.patch (text/plain), 15.99 KB, created by Keith Miller on 2019-01-16 09:19:43 PST

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Creator: Keith Miller

Created: 2019-01-16 09:19:43 PST

Size: 15.99 KB

patch

obsolete

>Subversion Revision: 240038
>diff --git a/Source/WTF/ChangeLog b/Source/WTF/ChangeLog
>index ac52ca0007afe2a2936d3673abc4e34edcb8651d..ab7bba6d764ad721c88751be0279af7fa655d1c5 100644
>--- a/Source/WTF/ChangeLog
>+++ b/Source/WTF/ChangeLog
>@@ -1,3 +1,14 @@
>+2019-01-16  Keith Miller  <keith_miller@apple.com>
>+
>+        bmalloc should use JSC VM tag for gigacage
>+        https://bugs.webkit.org/show_bug.cgi?id=193496
>+
>+        Reviewed by NOBODY (OOPS!).
>+
>+        Move most of the macros for vm tagging to bmalloc.
>+
>+        * wtf/VMTags.h:
>+
> 2019-01-16  Alberto Garcia  <berto@igalia.com>
> 
>         [WTF] Compilation fails with system malloc
>diff --git a/Source/bmalloc/ChangeLog b/Source/bmalloc/ChangeLog
>index a2c7064618c2c08c5a7c12bd3e4dc9e5f5f9fd38..9f8db76d321c667a58bceded3b5cf5020e153c6c 100644
>--- a/Source/bmalloc/ChangeLog
>+++ b/Source/bmalloc/ChangeLog
>@@ -1,3 +1,23 @@
>+2019-01-16  Keith Miller  <keith_miller@apple.com>
>+
>+        bmalloc should use JSC VM tag for gigacage
>+        https://bugs.webkit.org/show_bug.cgi?id=193496
>+
>+        Reviewed by NOBODY (OOPS!).
>+
>+        This patch moves the VMTag info from WTF to bmalloc so that we can
>+        tag gigacage memory with the unused JSC memory tag. The JSC memory
>+        tag was previously used for wasm but since wasm is now allocated
>+        out of the primitive cage it was unused.
>+
>+        * bmalloc.xcodeproj/project.pbxproj:
>+        * bmalloc/BVMTags.h: Copied from Source/WTF/wtf/VMTags.h.
>+        * bmalloc/Gigacage.cpp:
>+        (Gigacage::ensureGigacage):
>+        * bmalloc/VMAllocate.h:
>+        (bmalloc::tryVMAllocate):
>+        (bmalloc::vmZeroAndPurge):
>+
> 2019-01-09  Mark Lam  <mark.lam@apple.com>
> 
>         Gigacage disabling checks should handle the GIGACAGE_ALLOCATION_CAN_FAIL case properly.
>diff --git a/Source/WTF/wtf/VMTags.h b/Source/WTF/wtf/VMTags.h
>index 4cf781945086370658141bd806ce7e25bf808fc2..14e021fef350fc7e22c125cb780d95502cf574ba 100644
>--- a/Source/WTF/wtf/VMTags.h
>+++ b/Source/WTF/wtf/VMTags.h
>@@ -25,41 +25,15 @@
> 
> #pragma once
> 
>-// On Mac OS X, the VM subsystem allows tagging memory requested from mmap and vm_map
>-// in order to aid tools that inspect system memory use. 
>-#if OS(DARWIN)
>-
>-#include <mach/vm_statistics.h>
>-
>-#if defined(VM_MEMORY_TCMALLOC)
>-#define VM_TAG_FOR_TCMALLOC_MEMORY VM_MAKE_TAG(VM_MEMORY_TCMALLOC)
>-#else
>-#define VM_TAG_FOR_TCMALLOC_MEMORY VM_MAKE_TAG(53)
>-#endif // defined(VM_MEMORY_TCMALLOC)
>-
>-#if defined(VM_MEMORY_JAVASCRIPT_JIT_EXECUTABLE_ALLOCATOR)
>-#define VM_TAG_FOR_EXECUTABLEALLOCATOR_MEMORY VM_MAKE_TAG(VM_MEMORY_JAVASCRIPT_JIT_EXECUTABLE_ALLOCATOR)
>-#else
>-#define VM_TAG_FOR_EXECUTABLEALLOCATOR_MEMORY VM_MAKE_TAG(64)
>-#endif // defined(VM_MEMORY_JAVASCRIPT_JIT_EXECUTABLE_ALLOCATOR)
>-
>-#if defined(VM_MEMORY_JAVASCRIPT_JIT_REGISTER_FILE)
>-#define VM_TAG_FOR_REGISTERFILE_MEMORY VM_MAKE_TAG(VM_MEMORY_JAVASCRIPT_JIT_REGISTER_FILE)
>-#else
>-#define VM_TAG_FOR_REGISTERFILE_MEMORY VM_MAKE_TAG(65)
>-#endif // defined(VM_MEMORY_JAVASCRIPT_JIT_REGISTER_FILE)
>-
>-#if defined(VM_MEMORY_JAVASCRIPT_CORE)
>-#define VM_TAG_FOR_WEBASSEMBLY_MEMORY VM_MAKE_TAG(VM_MEMORY_JAVASCRIPT_CORE)
>-#else
>-#define VM_TAG_FOR_WEBASSEMBLY_MEMORY VM_MAKE_TAG(63)
>-#endif // defined(VM_MEMORY_JAVASCRIPT_CORE)
>-
>-#else // OS(DARWIN)
>+#if defined(USE_SYSTEM_MALLOC) && USE_SYSTEM_MALLOC
> 
> #define VM_TAG_FOR_TCMALLOC_MEMORY -1
> #define VM_TAG_FOR_WEBASSEMBLY_MEMORY -1
> #define VM_TAG_FOR_EXECUTABLEALLOCATOR_MEMORY -1
> #define VM_TAG_FOR_REGISTERFILE_MEMORY -1
> 
>-#endif // OS(DARWIN)
>+#else
>+
>+#include <bmalloc/BVMTags.h>
>+
>+#endif
>diff --git a/Source/bmalloc/bmalloc.xcodeproj/project.pbxproj b/Source/bmalloc/bmalloc.xcodeproj/project.pbxproj
>index 860c83eac4b644c2c7bc5d9611954fdb2f89646b..a77aa3bb2ef33c8e1093cfde7ee1dee4639fa0dd 100644
>--- a/Source/bmalloc/bmalloc.xcodeproj/project.pbxproj
>+++ b/Source/bmalloc/bmalloc.xcodeproj/project.pbxproj
>@@ -140,6 +140,7 @@
> 		AD0934331FCF406D00E85EB5 /* BCompiler.h in Headers */ = {isa = PBXBuildFile; fileRef = AD0934321FCF405000E85EB5 /* BCompiler.h */; settings = {ATTRIBUTES = (Private, ); }; };
> 		AD14AD29202529C400890E3B /* ProcessCheck.h in Headers */ = {isa = PBXBuildFile; fileRef = AD14AD27202529A600890E3B /* ProcessCheck.h */; };
> 		AD14AD2A202529C700890E3B /* ProcessCheck.mm in Sources */ = {isa = PBXBuildFile; fileRef = AD14AD28202529B000890E3B /* ProcessCheck.mm */; };
>+		DE8B13B321CC5D9F00A63FCD /* BVMTags.h in Headers */ = {isa = PBXBuildFile; fileRef = DE8B13B221CC5D9F00A63FCD /* BVMTags.h */; settings = {ATTRIBUTES = (Private, ); }; };
> /* End PBXBuildFile section */
> 
> /* Begin PBXContainerItemProxy section */
>@@ -303,6 +304,7 @@
> 		AD0934321FCF405000E85EB5 /* BCompiler.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; name = BCompiler.h; path = bmalloc/BCompiler.h; sourceTree = "<group>"; };
> 		AD14AD27202529A600890E3B /* ProcessCheck.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; name = ProcessCheck.h; path = bmalloc/ProcessCheck.h; sourceTree = "<group>"; };
> 		AD14AD28202529B000890E3B /* ProcessCheck.mm */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.objcpp; name = ProcessCheck.mm; path = bmalloc/ProcessCheck.mm; sourceTree = "<group>"; };
>+		DE8B13B221CC5D9F00A63FCD /* BVMTags.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; name = BVMTags.h; path = bmalloc/BVMTags.h; sourceTree = "<group>"; };
> /* End PBXFileReference section */
> 
> /* Begin PBXFrameworksBuildPhase section */
>@@ -525,6 +527,7 @@
> 				0F7EB84A1F9541C600F1ABCB /* Bits.h */,
> 				0F7EB84B1F9541C600F1ABCB /* BMalloced.h */,
> 				14C919C818FCC59F0028DB43 /* BPlatform.h */,
>+				DE8B13B221CC5D9F00A63FCD /* BVMTags.h */,
> 				0F74B93D1F89713E00B935D3 /* CryptoRandom.cpp */,
> 				0F74B93C1F89713E00B935D3 /* CryptoRandom.h */,
> 				14D9DB4517F2447100EAAB79 /* FixedVector.h */,
>@@ -539,8 +542,8 @@
> 				0F5BF1481F22A8D80029D91D /* PerHeapKind.h */,
> 				0F26A7A42054830D0090A141 /* PerProcess.cpp */,
> 				14446A0717A61FA400F9EA1D /* PerProcess.h */,
>-				144469FD17A61F1F00F9EA1D /* PerThread.h */,
> 				6543DDB320EEAEF3003B23D8 /* PerThread.cpp */,
>+				144469FD17A61F1F00F9EA1D /* PerThread.h */,
> 				145F6878179E3A4400D65598 /* Range.h */,
> 				148EFAE61D6B953B008E721E /* ScopeExit.h */,
> 				1417F64F18B7280C0076FA3F /* Syscall.h */,
>@@ -553,8 +556,8 @@
> 		4408F2961C9896C40012EC64 /* darwin */ = {
> 			isa = PBXGroup;
> 			children = (
>-				52F47248210BA2F500B730BB /* MemoryStatusSPI.h */,
> 				4426E2821C839547008EB042 /* BSoftLinking.h */,
>+				52F47248210BA2F500B730BB /* MemoryStatusSPI.h */,
> 			);
> 			name = darwin;
> 			sourceTree = "<group>";
>@@ -583,7 +586,6 @@
> 				0F5BF1731F23C5710029D91D /* BExport.h in Headers */,
> 				14DD78C918F48D7500950702 /* BInline.h in Headers */,
> 				0F7EB84C1F9541C700F1ABCB /* Bits.h in Headers */,
>-				52F47249210BA30200B730BB /* MemoryStatusSPI.h in Headers */,
> 				1448C30118F3754C00502839 /* bmalloc.h in Headers */,
> 				0F7EB84D1F9541C700F1ABCB /* BMalloced.h in Headers */,
> 				14C919C918FCC59F0028DB43 /* BPlatform.h in Headers */,
>@@ -591,6 +593,7 @@
> 				7939885B2076EEB60074A2E7 /* BulkDecommit.h in Headers */,
> 				14DD789C18F48D4A00950702 /* BumpAllocator.h in Headers */,
> 				140FA00319CE429C00FFD3C8 /* BumpRange.h in Headers */,
>+				DE8B13B321CC5D9F00A63FCD /* BVMTags.h in Headers */,
> 				14DD789918F48D4A00950702 /* Cache.h in Headers */,
> 				147DC6E31CA5B70B00724E8D /* Chunk.h in Headers */,
> 				0F74B93E1F89713E00B935D3 /* CryptoRandom.h in Headers */,
>@@ -640,6 +643,7 @@
> 				141D9B001C8E51C0000ABBA0 /* List.h in Headers */,
> 				4426E2811C838EE0008EB042 /* Logging.h in Headers */,
> 				14C8992B1CC485E70027A057 /* Map.h in Headers */,
>+				52F47249210BA30200B730BB /* MemoryStatusSPI.h in Headers */,
> 				143CB81D19022BC900B16A45 /* Mutex.h in Headers */,
> 				144BE11F1CA346520099C8C0 /* Object.h in Headers */,
> 				14DD789318F48D0F00950702 /* ObjectType.h in Headers */,
>@@ -739,7 +743,7 @@
> 			};
> 			buildConfigurationList = 145F683A179DC45F00D65598 /* Build configuration list for PBXProject "bmalloc" */;
> 			compatibilityVersion = "Xcode 3.2";
>-			developmentRegion = English;
>+                        developmentRegion = en;
> 			hasScannedForEncodings = 0;
> 			knownRegions = (
> 				en,
>@@ -791,7 +795,6 @@
> 				0F5BF14F1F22DEAF0029D91D /* Gigacage.cpp in Sources */,
> 				14F271C718EA3990008C152F /* Heap.cpp in Sources */,
> 				0FD557331F7EDB7B00B1F0A3 /* HeapKind.cpp in Sources */,
>-				6543DDB420EEAEF3003B23D8 /* PerThread.cpp in Sources */,
> 				0F7EB83B1F9541B000F1ABCB /* IsoHeapImpl.cpp in Sources */,
> 				0F5549EF1FB54704007FF75A /* IsoPage.cpp in Sources */,
> 				0F7EB8361F9541B000F1ABCB /* IsoTLS.cpp in Sources */,
>@@ -802,6 +805,7 @@
> 				143CB81C19022BC900B16A45 /* Mutex.cpp in Sources */,
> 				14F271C818EA3990008C152F /* ObjectType.cpp in Sources */,
> 				0F26A7A5205483130090A141 /* PerProcess.cpp in Sources */,
>+				6543DDB420EEAEF3003B23D8 /* PerThread.cpp in Sources */,
> 				AD14AD2A202529C700890E3B /* ProcessCheck.mm in Sources */,
> 				0F5BF1521F22E1570029D91D /* Scavenger.cpp in Sources */,
> 				14F271C918EA3990008C152F /* VMHeap.cpp in Sources */,
>diff --git a/Source/bmalloc/bmalloc/BVMTags.h b/Source/bmalloc/bmalloc/BVMTags.h
>new file mode 100644
>index 0000000000000000000000000000000000000000..e1e3587916ed112f7e1b0afbdbf6f210e53c3c95
>--- /dev/null
>+++ b/Source/bmalloc/bmalloc/BVMTags.h
>@@ -0,0 +1,79 @@
>+/*
>+ * Copyright (C) 2009, 2017 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * are met:
>+ * 1. Redistributions of source code must retain the above copyright
>+ *    notice, this list of conditions and the following disclaimer.
>+ * 2. Redistributions in binary form must reproduce the above copyright
>+ *    notice, this list of conditions and the following disclaimer in the
>+ *    documentation and/or other materials provided with the distribution.
>+ *
>+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
>+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
>+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
>+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
>+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
>+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
>+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
>+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
>+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
>+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
>+ */
>+
>+#pragma once
>+
>+#include "BPlatform.h"
>+
>+// On Mac OS X, the VM subsystem allows tagging memory requested from mmap and vm_map
>+// in order to aid tools that inspect system memory use.
>+#if BOS(DARWIN)
>+
>+#include <mach/vm_statistics.h>
>+
>+namespace bmalloc {
>+
>+#if defined(VM_MEMORY_TCMALLOC)
>+#define VM_TAG_FOR_TCMALLOC_MEMORY VM_MAKE_TAG(VM_MEMORY_TCMALLOC)
>+#else
>+#define VM_TAG_FOR_TCMALLOC_MEMORY VM_MAKE_TAG(53)
>+#endif // defined(VM_MEMORY_TCMALLOC)
>+
>+#if defined(VM_MEMORY_JAVASCRIPT_JIT_EXECUTABLE_ALLOCATOR)
>+#define VM_TAG_FOR_EXECUTABLEALLOCATOR_MEMORY VM_MAKE_TAG(VM_MEMORY_JAVASCRIPT_JIT_EXECUTABLE_ALLOCATOR)
>+#else
>+#define VM_TAG_FOR_EXECUTABLEALLOCATOR_MEMORY VM_MAKE_TAG(64)
>+#endif // defined(VM_MEMORY_JAVASCRIPT_JIT_EXECUTABLE_ALLOCATOR)
>+
>+#if defined(VM_MEMORY_JAVASCRIPT_JIT_REGISTER_FILE)
>+#define VM_TAG_FOR_REGISTERFILE_MEMORY VM_MAKE_TAG(VM_MEMORY_JAVASCRIPT_JIT_REGISTER_FILE)
>+#else
>+#define VM_TAG_FOR_REGISTERFILE_MEMORY VM_MAKE_TAG(65)
>+#endif // defined(VM_MEMORY_JAVASCRIPT_JIT_REGISTER_FILE)
>+
>+#if defined(VM_MEMORY_JAVASCRIPT_CORE)
>+#define VM_TAG_FOR_GIGACAGE_MEMORY VM_MAKE_TAG(VM_MEMORY_JAVASCRIPT_CORE)
>+#else
>+#define VM_TAG_FOR_GIGACAGE_MEMORY VM_MAKE_TAG(63)
>+#endif // defined(VM_MEMORY_JAVASCRIPT_CORE)
>+
>+#else // BOS(DARWIN)
>+
>+#define VM_TAG_FOR_TCMALLOC_MEMORY -1
>+#define VM_TAG_FOR_GIGACAGE_MEMORY -1
>+#define VM_TAG_FOR_EXECUTABLEALLOCATOR_MEMORY -1
>+#define VM_TAG_FOR_REGISTERFILE_MEMORY -1
>+
>+#endif // BOS(DARWIN)
>+
>+enum class VMUsage {
>+    UnknownUsage = -1,
>+    FastMallocPages = VM_TAG_FOR_TCMALLOC_MEMORY,
>+    JSVMStackPages = VM_TAG_FOR_REGISTERFILE_MEMORY,
>+    JSJITCodePages = VM_TAG_FOR_EXECUTABLEALLOCATOR_MEMORY,
>+    JSGigacagePages = VM_TAG_FOR_GIGACAGE_MEMORY,
>+};
>+
>+} // namespace bmalloc
>diff --git a/Source/bmalloc/bmalloc/Gigacage.cpp b/Source/bmalloc/bmalloc/Gigacage.cpp
>index 5b925c42678549e65314cf031d6e04c07b0e4692..0eac613a2735046b7fc6ce563afe16e123089509 100644
>--- a/Source/bmalloc/bmalloc/Gigacage.cpp
>+++ b/Source/bmalloc/bmalloc/Gigacage.cpp
>@@ -163,7 +163,7 @@ void ensureGigacage()
> 
>             // FIXME: Randomize where this goes.
>             // https://bugs.webkit.org/show_bug.cgi?id=175245
>-            void* base = tryVMAllocate(maxAlignment, totalSize);
>+            void* base = tryVMAllocate(maxAlignment, totalSize, VMUsage::JSGigacagePages);
>             if (!base) {
>                 if (GIGACAGE_ALLOCATION_CAN_FAIL)
>                     return;
>diff --git a/Source/bmalloc/bmalloc/VMAllocate.h b/Source/bmalloc/bmalloc/VMAllocate.h
>index 757d5cd1989037261e77341dfeea079cef3645e5..b7c4eb0bd8ce5155bfc4a7c20b03e8aa1abc63f1 100644
>--- a/Source/bmalloc/bmalloc/VMAllocate.h
>+++ b/Source/bmalloc/bmalloc/VMAllocate.h
>@@ -27,6 +27,7 @@
> #define VMAllocate_h
> 
> #include "BAssert.h"
>+#include "BVMTags.h"
> #include "Logging.h"
> #include "Range.h"
> #include "Sizes.h"
>@@ -37,19 +38,17 @@
> 
> #if BOS(DARWIN)
> #include <mach/vm_page_size.h>
>-#include <mach/vm_statistics.h>
> #endif
> 
> namespace bmalloc {
> 
>-#if BOS(DARWIN)
>-#define BMALLOC_VM_TAG VM_MAKE_TAG(VM_MEMORY_TCMALLOC)
>-#define BMALLOC_NORESERVE 0
>-#elif BOS(LINUX)
>-#define BMALLOC_VM_TAG -1
>+#ifndef BMALLOC_VM_TAG
>+#define BMALLOC_VM_TAG VM_TAG_FOR_TCMALLOC_MEMORY
>+#endif
>+
>+#if BOS(LINUX)
> #define BMALLOC_NORESERVE MAP_NORESERVE
> #else
>-#define BMALLOC_VM_TAG -1
> #define BMALLOC_NORESERVE 0
> #endif
> 
>@@ -122,10 +121,10 @@ inline void vmValidatePhysical(void* p, size_t vmSize)
>     BASSERT(p == mask(p, ~(vmPageSizePhysical() - 1)));
> }
> 
>-inline void* tryVMAllocate(size_t vmSize)
>+inline void* tryVMAllocate(size_t vmSize, VMUsage usage = VMUsage::FastMallocPages)
> {
>     vmValidate(vmSize);
>-    void* result = mmap(0, vmSize, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANON | BMALLOC_NORESERVE, BMALLOC_VM_TAG, 0);
>+    void* result = mmap(0, vmSize, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANON | BMALLOC_NORESERVE, static_cast<int>(usage), 0);
>     if (result == MAP_FAILED)
>         return nullptr;
>     return result;
>@@ -150,19 +149,19 @@ inline void vmRevokePermissions(void* p, size_t vmSize)
>     mprotect(p, vmSize, PROT_NONE);
> }
> 
>-inline void vmZeroAndPurge(void* p, size_t vmSize)
>+inline void vmZeroAndPurge(void* p, size_t vmSize, VMUsage usage = VMUsage::FastMallocPages)
> {
>     vmValidate(p, vmSize);
>     // MAP_ANON guarantees the memory is zeroed. This will also cause
>     // page faults on accesses to this range following this call.
>-    void* result = mmap(p, vmSize, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANON | MAP_FIXED | BMALLOC_NORESERVE, BMALLOC_VM_TAG, 0);
>+    void* result = mmap(p, vmSize, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANON | MAP_FIXED | BMALLOC_NORESERVE, static_cast<int>(usage), 0);
>     RELEASE_BASSERT(result == p);
> }
> 
> // Allocates vmSize bytes at a specified power-of-two alignment.
> // Use this function to create maskable memory regions.
> 
>-inline void* tryVMAllocate(size_t vmAlignment, size_t vmSize)
>+inline void* tryVMAllocate(size_t vmAlignment, size_t vmSize, VMUsage usage = VMUsage::FastMallocPages)
> {
>     vmValidate(vmSize);
>     vmValidate(vmAlignment);
>@@ -171,7 +170,7 @@ inline void* tryVMAllocate(size_t vmAlignment, size_t vmSize)
>     if (mappedSize < vmAlignment || mappedSize < vmSize) // Check for overflow
>         return nullptr;
> 
>-    char* mapped = static_cast<char*>(tryVMAllocate(mappedSize));
>+    char* mapped = static_cast<char*>(tryVMAllocate(mappedSize, usage));
>     if (!mapped)
>         return nullptr;
>     char* mappedEnd = mapped + mappedSize;

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Attachments on bug 193496: 359270 | 359273 | 359279