Ryan Macnak
b68351fbc3
TEST=build Change-Id: Ie3be570c274b0275a995a0f54b5e6ccdfc77ccd3 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/292287 Commit-Queue: Ryan Macnak <rmacnak@google.com> Reviewed-by: Brian Quinlan <bquinlan@google.com>
62 lines
1.9 KiB
C++
62 lines
1.9 KiB
C++
// Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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#include "bin/io_buffer.h"
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#include "platform/memory_sanitizer.h"
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namespace dart {
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namespace bin {
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Dart_Handle IOBuffer::Allocate(intptr_t size, uint8_t** buffer) {
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uint8_t* data = Allocate(size);
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if (data == nullptr) {
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return Dart_Null();
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}
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Dart_Handle result = Dart_NewExternalTypedDataWithFinalizer(
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Dart_TypedData_kUint8, data, size, data, size, IOBuffer::Finalizer);
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if (Dart_IsError(result)) {
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Free(data);
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Dart_PropagateError(result);
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}
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if (buffer != nullptr) {
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*buffer = data;
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}
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return result;
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}
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uint8_t* IOBuffer::Allocate(intptr_t size) {
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return static_cast<uint8_t*>(calloc(size, sizeof(uint8_t)));
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}
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uint8_t* IOBuffer::Reallocate(uint8_t* buffer, intptr_t new_size) {
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if (new_size == 0) {
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// The call to `realloc()` below has a corner case if the new size is 0:
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// It can return `nullptr` in that case even though `malloc(0)` would
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// return a unique non-`nullptr` value. To avoid returning `nullptr` on
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// successful realloc, we handle this case specially.
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auto new_buffer = IOBuffer::Allocate(0);
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if (new_buffer != nullptr) {
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free(buffer);
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return new_buffer;
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}
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return buffer;
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}
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#if defined(DART_TARGET_OS_WINDOWS)
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// It seems windows realloc() doesn't free memory when shrinking, so we'll
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// manually allocate a new buffer, copy the data and free the old buffer.
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auto new_buffer = IOBuffer::Allocate(new_size);
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if (new_buffer != nullptr) {
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memmove(new_buffer, buffer, new_size);
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free(buffer);
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return static_cast<uint8_t*>(new_buffer);
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}
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#endif
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return static_cast<uint8_t*>(realloc(buffer, new_size));
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}
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} // namespace bin
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} // namespace dart
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