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-- a/js/src/jit/ProcessExecutableMemory.cpp |
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++ b/js/src/jit/ProcessExecutableMemory.cpp |
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Lines 248-254
static void* ComputeRandomAllocationAddress() {
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// x64 CPUs have a 48-bit address space and on some platforms the OS will |
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// x64 CPUs have a 48-bit address space and on some platforms the OS will |
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// give us access to 47 bits, so to be safe we right shift by 18 to leave |
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// give us access to 47 bits, so to be safe we right shift by 18 to leave |
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// 46 bits. |
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// 46 bits. |
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#ifdef __ia64__ |
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rand >>= 20; // upper 20 mits are reserved for virtual memory type tag |
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#else |
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rand >>= 18; |
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rand >>= 18; |
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#endif |
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#else |
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#else |
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// On 32-bit, right shift by 34 to leave 30 bits, range [0, 1GiB). Then add |
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// On 32-bit, right shift by 34 to leave 30 bits, range [0, 1GiB). Then add |
| 254 |
// 512MiB to get range [512MiB, 1.5GiB), or [0x20000000, 0x60000000). This |
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// 512MiB to get range [512MiB, 1.5GiB), or [0x20000000, 0x60000000). This |
