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Reland "Reland "[VM runtime] Dual mapping of executable pages.""

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This is a reland of 6da340bf76

Original change's description:
> Reland "[VM runtime] Dual mapping of executable pages."
> 
> This is a reland of 44186dfdcd
> 
> Original change's description:
> > [VM runtime] Dual mapping of executable pages.
> > 
> > Change-Id: Iaad78d324e25462ce951f4df26974a6a368c50b7
> > Reviewed-on: https://dart-review.googlesource.com/c/93377
> > Commit-Queue: Régis Crelier <regis@google.com>
> > Reviewed-by: Ryan Macnak <rmacnak@google.com>
> 
> Change-Id: I7a0caa078950637d9fe831732577fd2467061099
> Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/95263
> Reviewed-by: Ryan Macnak <rmacnak@google.com>

Change-Id: I3a01f0e67d733c5db41618f691431e72c1e1cb2e
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/96422
Reviewed-by: Ryan Macnak <rmacnak@google.com>
Commit-Queue: Régis Crelier <regis@google.com>
This commit is contained in:
Régis Crelier
2019-03-12 20:45:45 +00:00
committed by commit-bot@chromium.org
parent 49a0502f49
commit a39833d957
19 changed files with 419 additions and 72 deletions
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runtime/vm/code_patcher.h
+3
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@@ -19,10 +19,12 @@ class RawCode;
class RawFunction;
class RawObject;
#if defined(TARGET_ARCH_IA32) || defined(TARGET_ARCH_DBC)
// Stack-allocated class to create a scope where the specified region
// [address, address + size] has write access enabled. This is used
// when patching generated code. Access is reset to read-execute in
// the destructor of this scope.
// Dual mapping of instructions pages is not supported on these target arch.
class WritableInstructionsScope : public ValueObject {
public:
WritableInstructionsScope(uword address, intptr_t size);
@@ -32,6 +34,7 @@ class WritableInstructionsScope : public ValueObject {
const uword address_;
const intptr_t size_;
};
#endif // defined(TARGET_ARCH_IA32) || defined(TARGET_ARCH_DBC)
class CodePatcher : public AllStatic {
public: