AuroraMiddleware/v8
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[test] Better error handling for mock allocator

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Not just the large virtual allocation but *all* memory operations
should handle resource exhaustion gracefully.

Bug: chromium:1042943
Change-Id: I8d36a3d7fa267b588b35b927172bfe56f64fffd2
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2007489
Auto-Submit: Jakob Kummerow <jkummerow@chromium.org>
Commit-Queue: Clemens Backes <clemensb@chromium.org>
Reviewed-by: Clemens Backes <clemensb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#65836}
This commit is contained in:
Jakob Kummerow 2020-01-17 12:44:36 +01:00 committed by Commit Bot
parent 5eb5015ea8
commit 1adb076c07
1 changed files with 18 additions and 4 deletions
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18
src/d8/d8.cc
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@ -236,16 +236,24 @@ class MultiMappedAllocator : public ArrayBufferAllocatorBase {
int flags = MAP_SHARED | MAP_ANONYMOUS;
void* real_alloc = mmap(nullptr, kChunkSize, prot, flags, -1, 0);
if (reinterpret_cast<intptr_t>(real_alloc) == -1) {
// If we ran into some limit (physical or virtual memory, or number
// of mappings, etc), return {nullptr}, which callers can handle.
if (errno == ENOMEM) {
return nullptr;
}
// Other errors may be bugs which we want to learn about.
FATAL("mmap (real) failed with error %d: %s", errno, strerror(errno));
}
void* virtual_alloc =
mmap(nullptr, rounded_length, prot, flags | MAP_NORESERVE, -1, 0);
if (reinterpret_cast<intptr_t>(virtual_alloc) == -1) {
// Virtual memory allocation failed, probably because the requested
// size was too big. Callers can handle this.
if (errno == ENOMEM) {
// Undo earlier, successful mappings.
munmap(real_alloc, kChunkSize);
return nullptr;
}
FATAL("mmap (virtual) failed with error %d: %s", errno, strerror(errno));
}
i::Address virtual_base = reinterpret_cast<i::Address>(virtual_alloc);
i::Address virtual_end = virtual_base + rounded_length;
for (i::Address to_map = virtual_base; to_map < virtual_end;
@ -257,6 +265,12 @@ class MultiMappedAllocator : public ArrayBufferAllocatorBase {
mremap(real_alloc, 0, kChunkSize, MREMAP_MAYMOVE | MREMAP_FIXED,
reinterpret_cast<void*>(to_map));
if (reinterpret_cast<intptr_t>(result) == -1) {
if (errno == ENOMEM) {
// Undo earlier, successful mappings.
munmap(real_alloc, kChunkSize);
munmap(virtual_alloc, (to_map - virtual_base));
return nullptr;
}
FATAL("mremap failed with error %d: %s", errno, strerror(errno));
}
}