From 4d02711ea578dbb789abb30cbaf12f9926e13d81 Mon Sep 17 00:00:00 2001 From: Roland Levillain Date: Wed, 1 Jul 2015 15:41:14 +0100 Subject: Implement heap poisoning in ART's Optimizing compiler. - Instrument ARM, ARM64, x86 and x86-64 code generators. - Note: To turn heap poisoning on in Optimizing, set the environment variable `ART_HEAP_POISONING' to "true" before compiling ART. Bug: 12687968 Change-Id: Ib3120b38cf805a8a50207a314b9ccc90c8d93740 --- compiler/utils/arm/assembler_arm.h | 23 ++++++++++++++++++++++- 1 file changed, 22 insertions(+), 1 deletion(-) (limited to 'compiler/utils/arm/assembler_arm.h') diff --git a/compiler/utils/arm/assembler_arm.h b/compiler/utils/arm/assembler_arm.h index f8ca48ef57..5d85d11054 100644 --- a/compiler/utils/arm/assembler_arm.h +++ b/compiler/utils/arm/assembler_arm.h @@ -774,7 +774,7 @@ class ArmAssembler : public Assembler { void LoadRef(ManagedRegister dest, FrameOffset src) OVERRIDE; void LoadRef(ManagedRegister dest, ManagedRegister base, MemberOffset offs, - bool poison_reference) OVERRIDE; + bool unpoison_reference) OVERRIDE; void LoadRawPtr(ManagedRegister dest, ManagedRegister base, Offset offs) OVERRIDE; @@ -857,6 +857,27 @@ class ArmAssembler : public Assembler { return r >= R8; } + // + // Heap poisoning. + // + + // Poison a heap reference contained in `reg`. + void PoisonHeapReference(Register reg) { + // reg = -reg. + rsb(reg, reg, ShifterOperand(0)); + } + // Unpoison a heap reference contained in `reg`. + void UnpoisonHeapReference(Register reg) { + // reg = -reg. + rsb(reg, reg, ShifterOperand(0)); + } + // Unpoison a heap reference contained in `reg` if heap poisoning is enabled. + void MaybeUnpoisonHeapReference(Register reg) { + if (kPoisonHeapReferences) { + UnpoisonHeapReference(reg); + } + } + protected: // Returns whether or not the given register is used for passing parameters. static int RegisterCompare(const Register* reg1, const Register* reg2) { -- cgit v1.2.3-59-g8ed1b