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1 // Copyright 2015 The Chromium Authors. All rights reserved. | |
2 // Use of this source code is governed by a BSD-style license that can be | |
3 // found in the LICENSE file. | |
4 | |
5 #include "config.h" | |
6 #include "platform/heap/StackFrameDepth.h" | |
7 | |
8 namespace blink { | |
9 | |
10 static const char* s_avoidOptimization = nullptr; | |
11 | |
12 // NEVER_INLINE ensures that |dummy| array on configureLimit() is not optimized
away, | |
13 // and the stack frame base register is adjusted |kSafeStackFrameSize|. | |
14 NEVER_INLINE static uintptr_t currentStackFrameBaseOnCallee(const char* dummy) | |
15 { | |
16 s_avoidOptimization = dummy; | |
17 return StackFrameDepth::currentStackFrame(); | |
18 } | |
19 | |
20 void StackFrameDepth::configureLimit() | |
21 { | |
22 // Allocate a large object in stack and query stack frame pointer after it. | |
23 char dummy[kSafeStackFrameSize]; | |
24 m_stackFrameLimit = currentStackFrameBaseOnCallee(dummy); | |
25 | |
26 // Assert that the stack frame can be used. | |
27 dummy[sizeof(dummy) - 1] = 0; | |
28 } | |
29 | |
30 } // namespace blink | |
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