webkitgtk-2.12.3webkitgtk-2.12.3

1 files changed, 211 insertions, 89 deletions

diff --git a/Source/JavaScriptCore/assembler/MacroAssemblerARMv7.h b/Source/JavaScriptCore/assembler/MacroAssemblerARMv7.h
index 68a04fd22..3bc85bce9 100644
--- a/Source/JavaScriptCore/assembler/MacroAssemblerARMv7.h
+++ b/Source/JavaScriptCore/assembler/MacroAssemblerARMv7.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2009, 2010 Apple Inc. All rights reserved.
+ * Copyright (C) 2009-2010, 2014-2015 Apple Inc. All rights reserved.
  * Copyright (C) 2010 University of Szeged
  *
  * Redistribution and use in source and binary forms, with or without
@@ -34,7 +34,7 @@
 
 namespace JSC {
 
-class MacroAssemblerARMv7 : public AbstractMacroAssembler<ARMv7Assembler> {
+class MacroAssemblerARMv7 : public AbstractMacroAssembler<ARMv7Assembler, MacroAssemblerARMv7> {
     static const RegisterID dataTempRegister = ARMRegisters::ip;
     static const RegisterID addressTempRegister = ARMRegisters::r6;
 
@@ -62,12 +62,11 @@ public:
 
     Vector<LinkRecord, 0, UnsafeVectorOverflow>& jumpsToLink() { return m_assembler.jumpsToLink(); }
     void* unlinkedCode() { return m_assembler.unlinkedCode(); }
-    bool canCompact(JumpType jumpType) { return m_assembler.canCompact(jumpType); }
-    JumpLinkType computeJumpType(JumpType jumpType, const uint8_t* from, const uint8_t* to) { return m_assembler.computeJumpType(jumpType, from, to); }
-    JumpLinkType computeJumpType(LinkRecord& record, const uint8_t* from, const uint8_t* to) { return m_assembler.computeJumpType(record, from, to); }
-    void recordLinkOffsets(int32_t regionStart, int32_t regionEnd, int32_t offset) {return m_assembler.recordLinkOffsets(regionStart, regionEnd, offset); }
-    int jumpSizeDelta(JumpType jumpType, JumpLinkType jumpLinkType) { return m_assembler.jumpSizeDelta(jumpType, jumpLinkType); }
-    void link(LinkRecord& record, uint8_t* from, uint8_t* to) { return m_assembler.link(record, from, to); }
+    static bool canCompact(JumpType jumpType) { return ARMv7Assembler::canCompact(jumpType); }
+    static JumpLinkType computeJumpType(JumpType jumpType, const uint8_t* from, const uint8_t* to) { return ARMv7Assembler::computeJumpType(jumpType, from, to); }
+    static JumpLinkType computeJumpType(LinkRecord& record, const uint8_t* from, const uint8_t* to) { return ARMv7Assembler::computeJumpType(record, from, to); }
+    static int jumpSizeDelta(JumpType jumpType, JumpLinkType jumpLinkType) { return ARMv7Assembler::jumpSizeDelta(jumpType, jumpLinkType); }
+    static void link(LinkRecord& record, uint8_t* from, uint8_t* to) { return ARMv7Assembler::link(record, from, to); }
 
     struct ArmAddress {
         enum AddressType {
@@ -156,6 +155,11 @@ public:
         m_assembler.add(dest, dest, src);
     }
 
+    void add32(RegisterID left, RegisterID right, RegisterID dest)
+    {
+        m_assembler.add(dest, left, right);
+    }
+
     void add32(TrustedImm32 imm, RegisterID dest)
     {
         add32(imm, dest, dest);
@@ -170,6 +174,14 @@ public:
     void add32(TrustedImm32 imm, RegisterID src, RegisterID dest)
     {
         ARMThumbImmediate armImm = ARMThumbImmediate::makeUInt12OrEncodedImm(imm.m_value);
+
+        // For adds with stack pointer destination, moving the src first to sp is
+        // needed to avoid unpredictable instruction
+        if (dest == ARMRegisters::sp && src != dest) {
+            move(src, ARMRegisters::sp);
+            src = ARMRegisters::sp;
+        }
+
         if (armImm.isValid())
             m_assembler.add(dest, src, armImm);
         else {
@@ -218,6 +230,11 @@ public:
         store32(dataTempRegister, address.m_ptr);
     }
 
+    void addPtrNoFlags(TrustedImm32 imm, RegisterID srcDest)
+    {
+        add32(imm, srcDest);
+    }
+    
     void add64(TrustedImm32 imm, AbsoluteAddress address)
     {
         move(TrustedImmPtr(address.m_ptr), addressTempRegister);
@@ -329,6 +346,31 @@ public:
         store32(dataTempRegister, addressTempRegister);
     }
 
+    void or32(TrustedImm32 imm, AbsoluteAddress address)
+    {
+        ARMThumbImmediate armImm = ARMThumbImmediate::makeEncodedImm(imm.m_value);
+        if (armImm.isValid()) {
+            move(TrustedImmPtr(address.m_ptr), addressTempRegister);
+            load32(addressTempRegister, dataTempRegister);
+            m_assembler.orr(dataTempRegister, dataTempRegister, armImm);
+            store32(dataTempRegister, addressTempRegister);
+        } else {
+            move(TrustedImmPtr(address.m_ptr), addressTempRegister);
+            load32(addressTempRegister, dataTempRegister);
+            move(imm, addressTempRegister);
+            m_assembler.orr(dataTempRegister, dataTempRegister, addressTempRegister);
+            move(TrustedImmPtr(address.m_ptr), addressTempRegister);
+            store32(dataTempRegister, addressTempRegister);
+        }
+    }
+
+    void or32(TrustedImm32 imm, Address address)
+    {
+        load32(address, dataTempRegister);
+        or32(imm, dataTempRegister, dataTempRegister);
+        store32(dataTempRegister, address);
+    }
+
     void or32(TrustedImm32 imm, RegisterID dest)
     {
         or32(imm, dest, dest);
@@ -345,6 +387,7 @@ public:
         if (armImm.isValid())
             m_assembler.orr(dest, src, armImm);
         else {
+            ASSERT(src != dataTempRegister);
             move(imm, dataTempRegister);
             m_assembler.orr(dest, src, dataTempRegister);
         }
@@ -362,7 +405,10 @@ public:
 
     void rshift32(RegisterID src, TrustedImm32 imm, RegisterID dest)
     {
-        m_assembler.asr(dest, src, imm.m_value & 0x1f);
+        if (!imm.m_value)
+            move(src, dest);
+        else
+            m_assembler.asr(dest, src, imm.m_value & 0x1f);
     }
 
     void rshift32(RegisterID shiftAmount, RegisterID dest)
@@ -387,7 +433,10 @@ public:
     
     void urshift32(RegisterID src, TrustedImm32 imm, RegisterID dest)
     {
-        m_assembler.lsr(dest, src, imm.m_value & 0x1f);
+        if (!imm.m_value)
+            move(src, dest);
+        else
+            m_assembler.lsr(dest, src, imm.m_value & 0x1f);
     }
 
     void urshift32(RegisterID shiftAmount, RegisterID dest)
@@ -527,7 +576,7 @@ private:
         }
     }
     
-    void load16Signed(ArmAddress address, RegisterID dest)
+    void load16SignedExtendTo32(ArmAddress address, RegisterID dest)
     {
         ASSERT(address.type == ArmAddress::HasIndex);
         m_assembler.ldrsh(dest, address.base, address.u.index, address.u.scale);
@@ -547,7 +596,7 @@ private:
         }
     }
     
-    void load8Signed(ArmAddress address, RegisterID dest)
+    void load8SignedExtendTo32(ArmAddress address, RegisterID dest)
     {
         ASSERT(address.type == ArmAddress::HasIndex);
         m_assembler.ldrsb(dest, address.base, address.u.index, address.u.scale);
@@ -624,6 +673,18 @@ public:
         m_assembler.ldr(dest, addressTempRegister, ARMThumbImmediate::makeUInt16(0));
     }
     
+    void abortWithReason(AbortReason reason)
+    {
+        move(TrustedImm32(reason), dataTempRegister);
+        breakpoint();
+    }
+
+    void abortWithReason(AbortReason reason, intptr_t misc)
+    {
+        move(TrustedImm32(misc), addressTempRegister);
+        abortWithReason(reason);
+    }
+
     ConvertibleLoadLabel convertibleLoadPtr(Address address, RegisterID dest)
     {
         ConvertibleLoadLabel result(this);
@@ -637,7 +698,7 @@ public:
         load8(setupArmAddress(address), dest);
     }
 
-    void load8Signed(ImplicitAddress, RegisterID)
+    void load8SignedExtendTo32(ImplicitAddress, RegisterID)
     {
         UNREACHABLE_FOR_PLATFORM();
     }
@@ -647,9 +708,9 @@ public:
         load8(setupArmAddress(address), dest);
     }
     
-    void load8Signed(BaseIndex address, RegisterID dest)
+    void load8SignedExtendTo32(BaseIndex address, RegisterID dest)
     {
-        load8Signed(setupArmAddress(address), dest);
+        load8SignedExtendTo32(setupArmAddress(address), dest);
     }
 
     void load8(const void* address, RegisterID dest)
@@ -683,9 +744,9 @@ public:
         m_assembler.ldrh(dest, makeBaseIndexBase(address), address.index, address.scale);
     }
     
-    void load16Signed(BaseIndex address, RegisterID dest)
+    void load16SignedExtendTo32(BaseIndex address, RegisterID dest)
     {
-        load16Signed(setupArmAddress(address), dest);
+        load16SignedExtendTo32(setupArmAddress(address), dest);
     }
     
     void load16(ImplicitAddress address, RegisterID dest)
@@ -699,7 +760,7 @@ public:
         }
     }
     
-    void load16Signed(ImplicitAddress, RegisterID)
+    void load16SignedExtendTo32(ImplicitAddress, RegisterID)
     {
         UNREACHABLE_FOR_PLATFORM();
     }
@@ -745,6 +806,11 @@ public:
         store32(dataTempRegister, address);
     }
 
+    void store8(RegisterID src, Address address)
+    {
+        store8(src, setupArmAddress(address));
+    }
+    
     void store8(RegisterID src, BaseIndex address)
     {
         store8(src, setupArmAddress(address));
@@ -762,6 +828,12 @@ public:
         store8(dataTempRegister, address);
     }
     
+    void store8(TrustedImm32 imm, Address address)
+    {
+        move(imm, dataTempRegister);
+        store8(dataTempRegister, address);
+    }
+    
     void store16(RegisterID src, BaseIndex address)
     {
         store16(src, setupArmAddress(address));
@@ -803,6 +875,7 @@ public:
     static bool supportsFloatingPointTruncate() { return true; }
     static bool supportsFloatingPointSqrt() { return true; }
     static bool supportsFloatingPointAbs() { return true; }
+    static bool supportsFloatingPointRounding() { return false; }
 
     void loadDouble(ImplicitAddress address, FPRegisterID dest)
     {
@@ -856,9 +929,15 @@ public:
             m_assembler.vmov(dest, src);
     }
 
-    void loadDouble(const void* address, FPRegisterID dest)
+    void moveZeroToDouble(FPRegisterID reg)
     {
-        move(TrustedImmPtr(address), addressTempRegister);
+        static double zeroConstant = 0.;
+        loadDouble(TrustedImmPtr(&zeroConstant), reg);
+    }
+
+    void loadDouble(TrustedImmPtr address, FPRegisterID dest)
+    {
+        move(address, addressTempRegister);
         m_assembler.vldr(dest, addressTempRegister, 0);
     }
 
@@ -892,9 +971,9 @@ public:
         m_assembler.fsts(ARMRegisters::asSingle(src), base, offset);
     }
 
-    void storeDouble(FPRegisterID src, const void* address)
+    void storeDouble(FPRegisterID src, TrustedImmPtr address)
     {
-        move(TrustedImmPtr(address), addressTempRegister);
+        move(address, addressTempRegister);
         storeDouble(src, addressTempRegister);
     }
 
@@ -932,7 +1011,7 @@ public:
 
     void addDouble(AbsoluteAddress address, FPRegisterID dest)
     {
-        loadDouble(address.m_ptr, fpTempRegister);
+        loadDouble(TrustedImmPtr(address.m_ptr), fpTempRegister);
         m_assembler.vadd(dest, dest, fpTempRegister);
     }
 
@@ -993,6 +1072,18 @@ public:
         m_assembler.vneg(dest, src);
     }
 
+    NO_RETURN_DUE_TO_CRASH void ceilDouble(FPRegisterID, FPRegisterID)
+    {
+        ASSERT(!supportsFloatingPointRounding());
+        CRASH();
+    }
+
+    NO_RETURN_DUE_TO_CRASH void floorDouble(FPRegisterID, FPRegisterID)
+    {
+        ASSERT(!supportsFloatingPointRounding());
+        CRASH();
+    }
+
     void convertInt32ToDouble(RegisterID src, FPRegisterID dest)
     {
         m_assembler.vmov(fpTempRegister, src, src);
@@ -1138,14 +1229,12 @@ public:
     
     void pop(RegisterID dest)
     {
-        // store postindexed with writeback
-        m_assembler.ldr(dest, ARMRegisters::sp, sizeof(void*), false, true);
+        m_assembler.pop(dest);
     }
 
     void push(RegisterID src)
     {
-        // store preindexed with writeback
-        m_assembler.str(src, ARMRegisters::sp, -sizeof(void*), true, true);
+        m_assembler.push(src);
     }
 
     void push(Address address)
@@ -1160,6 +1249,16 @@ public:
         push(dataTempRegister);
     }
 
+    void popPair(RegisterID dest1, RegisterID dest2)
+    {
+        m_assembler.pop(1 << dest1 | 1 << dest2);
+    }
+    
+    void pushPair(RegisterID src1, RegisterID src2)
+    {
+        m_assembler.push(1 << src1 | 1 << src2);
+    }
+    
     // Register move operations:
     //
     // Move values in registers.
@@ -1255,25 +1354,22 @@ public:
 private:
 
     // Should we be using TEQ for equal/not-equal?
-    void compare32(RegisterID left, TrustedImm32 right)
+    void compare32AndSetFlags(RegisterID left, TrustedImm32 right)
     {
         int32_t imm = right.m_value;
-        if (!imm)
-            m_assembler.tst(left, left);
+        ARMThumbImmediate armImm = ARMThumbImmediate::makeEncodedImm(imm);
+        if (armImm.isValid())
+            m_assembler.cmp(left, armImm);
+        else if ((armImm = ARMThumbImmediate::makeEncodedImm(-imm)).isValid())
+            m_assembler.cmn(left, armImm);
         else {
-            ARMThumbImmediate armImm = ARMThumbImmediate::makeEncodedImm(imm);
-            if (armImm.isValid())
-                m_assembler.cmp(left, armImm);
-            else if ((armImm = ARMThumbImmediate::makeEncodedImm(-imm)).isValid())
-                m_assembler.cmn(left, armImm);
-            else {
-                move(TrustedImm32(imm), dataTempRegister);
-                m_assembler.cmp(left, dataTempRegister);
-            }
+            move(TrustedImm32(imm), dataTempRegister);
+            m_assembler.cmp(left, dataTempRegister);
         }
     }
 
-    void test32(RegisterID reg, TrustedImm32 mask)
+public:
+    void test32(RegisterID reg, TrustedImm32 mask = TrustedImm32(-1))
     {
         int32_t imm = mask.m_value;
 
@@ -1281,16 +1377,28 @@ private:
             m_assembler.tst(reg, reg);
         else {
             ARMThumbImmediate armImm = ARMThumbImmediate::makeEncodedImm(imm);
-            if (armImm.isValid())
-                m_assembler.tst(reg, armImm);
-            else {
+            if (armImm.isValid()) {
+                if (reg == ARMRegisters::sp) {
+                    move(reg, addressTempRegister);
+                    m_assembler.tst(addressTempRegister, armImm);
+                } else
+                    m_assembler.tst(reg, armImm);
+            } else {
                 move(mask, dataTempRegister);
-                m_assembler.tst(reg, dataTempRegister);
+                if (reg == ARMRegisters::sp) {
+                    move(reg, addressTempRegister);
+                    m_assembler.tst(addressTempRegister, dataTempRegister);
+                } else
+                    m_assembler.tst(reg, dataTempRegister);
             }
         }
     }
+    
+    Jump branch(ResultCondition cond)
+    {
+        return Jump(makeBranch(cond));
+    }
 
-public:
     Jump branch32(RelationalCondition cond, RegisterID left, RegisterID right)
     {
         m_assembler.cmp(left, right);
@@ -1299,7 +1407,7 @@ public:
 
     Jump branch32(RelationalCondition cond, RegisterID left, TrustedImm32 right)
     {
-        compare32(left, right);
+        compare32AndSetFlags(left, right);
         return Jump(makeBranch(cond));
     }
 
@@ -1349,9 +1457,15 @@ public:
         return branch32(cond, addressTempRegister, right);
     }
 
+    Jump branchPtr(RelationalCondition cond, BaseIndex left, RegisterID right)
+    {
+        load32(left, dataTempRegister);
+        return branch32(cond, dataTempRegister, right);
+    }
+
     Jump branch8(RelationalCondition cond, RegisterID left, TrustedImm32 right)
     {
-        compare32(left, right);
+        compare32AndSetFlags(left, right);
         return Jump(makeBranch(cond));
     }
 
@@ -1534,7 +1648,7 @@ public:
         return branchMul32(cond, src, dest, dest);
     }
 
-    Jump branchMul32(ResultCondition cond, TrustedImm32 imm, RegisterID src, RegisterID dest)
+    Jump branchMul32(ResultCondition cond, RegisterID src, TrustedImm32 imm, RegisterID dest)
     {
         move(imm, dataTempRegister);
         return branchMul32(cond, dataTempRegister, src, dest);
@@ -1607,6 +1721,12 @@ public:
         return Call(m_assembler.blx(dataTempRegister), Call::LinkableNear);
     }
 
+    ALWAYS_INLINE Call nearTailCall()
+    {
+        moveFixedWidthEncoding(TrustedImm32(0), dataTempRegister);
+        return Call(m_assembler.bx(dataTempRegister), Call::LinkableNearTail);
+    }
+
     ALWAYS_INLINE Call call()
     {
         moveFixedWidthEncoding(TrustedImm32(0), dataTempRegister);
@@ -1651,7 +1771,7 @@ public:
 
     void compare32(RelationalCondition cond, RegisterID left, TrustedImm32 right, RegisterID dest)
     {
-        compare32(left, right);
+        compare32AndSetFlags(left, right);
         m_assembler.it(armV7Condition(cond), false);
         m_assembler.mov(dest, ARMThumbImmediate::makeUInt16(1));
         m_assembler.mov(dest, ARMThumbImmediate::makeUInt16(0));
@@ -1706,6 +1826,13 @@ public:
         return branch32(cond, addressTempRegister, dataTempRegister);
     }
     
+    ALWAYS_INLINE Jump branch32WithPatch(RelationalCondition cond, Address left, DataLabel32& dataLabel, TrustedImm32 initialRightValue = TrustedImm32(0))
+    {
+        load32(left, addressTempRegister);
+        dataLabel = moveWithPatch(initialRightValue, dataTempRegister);
+        return branch32(cond, addressTempRegister, dataTempRegister);
+    }
+    
     PatchableJump patchableBranchPtr(RelationalCondition cond, Address left, TrustedImmPtr right = TrustedImmPtr(0))
     {
         m_makeJumpPatchable = true;
@@ -1738,6 +1865,14 @@ public:
         return PatchableJump(result);
     }
 
+    PatchableJump patchableBranch32WithPatch(RelationalCondition cond, Address left, DataLabel32& dataLabel, TrustedImm32 initialRightValue = TrustedImm32(0))
+    {
+        m_makeJumpPatchable = true;
+        Jump result = branch32WithPatch(cond, left, dataLabel, initialRightValue);
+        m_makeJumpPatchable = false;
+        return PatchableJump(result);
+    }
+
     PatchableJump patchableJump()
     {
         padBeforePatch();
@@ -1770,17 +1905,13 @@ public:
     }
 
     
-    int executableOffsetFor(int location)
-    {
-        return m_assembler.executableOffsetFor(location);
-    }
-
     static FunctionPtr readCallTarget(CodeLocationCall call)
     {
         return FunctionPtr(reinterpret_cast<void(*)()>(ARMv7Assembler::readCallTarget(call.dataLocation())));
     }
     
     static bool canJumpReplacePatchableBranchPtrWithPatch() { return false; }
+    static bool canJumpReplacePatchableBranch32WithPatch() { return false; }
     
     static CodeLocationLabel startOfBranchPtrWithPatchOnRegister(CodeLocationDataLabelPtr label)
     {
@@ -1804,36 +1935,35 @@ public:
         return CodeLocationLabel();
     }
     
+    static CodeLocationLabel startOfPatchableBranch32WithPatchOnAddress(CodeLocationDataLabel32)
+    {
+        UNREACHABLE_FOR_PLATFORM();
+        return CodeLocationLabel();
+    }
+    
     static void revertJumpReplacementToPatchableBranchPtrWithPatch(CodeLocationLabel, Address, void*)
     {
         UNREACHABLE_FOR_PLATFORM();
     }
 
-#if USE(MASM_PROBE)
-    struct CPUState {
-        #define DECLARE_REGISTER(_type, _regName) \
-            _type _regName;
-        FOR_EACH_CPU_REGISTER(DECLARE_REGISTER)
-        #undef DECLARE_REGISTER
-    };
-
-    struct ProbeContext;
-    typedef void (*ProbeFunction)(struct ProbeContext*);
+    static void revertJumpReplacementToPatchableBranch32WithPatch(CodeLocationLabel, Address, int32_t)
+    {
+        UNREACHABLE_FOR_PLATFORM();
+    }
 
-    struct ProbeContext {
-        ProbeFunction probeFunction;
-        void* arg1;
-        void* arg2;
-        CPUState cpu;
+    static void repatchCall(CodeLocationCall call, CodeLocationLabel destination)
+    {
+        ARMv7Assembler::relinkCall(call.dataLocation(), destination.executableAddress());
+    }
 
-        void dump(const char* indentation = 0);
-    private:
-        void dumpCPURegisters(const char* indentation);
-    };
+    static void repatchCall(CodeLocationCall call, FunctionPtr destination)
+    {
+        ARMv7Assembler::relinkCall(call.dataLocation(), destination.executableAddress());
+    }
 
-    // For details about probe(), see comment in MacroAssemblerX86_64.h.
-    void probe(ProbeFunction, void* arg1 = 0, void* arg2 = 0);
-#endif // USE(MASM_PROBE)
+#if ENABLE(MASM_PROBE)
+    void probe(ProbeFunction, void* arg1, void* arg2);
+#endif // ENABLE(MASM_PROBE)
 
 protected:
     ALWAYS_INLINE Jump jump()
@@ -1928,24 +2058,16 @@ protected:
     
 private:
     friend class LinkBuffer;
-    friend class RepatchBuffer;
 
     static void linkCall(void* code, Call call, FunctionPtr function)
     {
-        ARMv7Assembler::linkCall(code, call.m_label, function.value());
-    }
-
-    static void repatchCall(CodeLocationCall call, CodeLocationLabel destination)
-    {
-        ARMv7Assembler::relinkCall(call.dataLocation(), destination.executableAddress());
-    }
-
-    static void repatchCall(CodeLocationCall call, FunctionPtr destination)
-    {
-        ARMv7Assembler::relinkCall(call.dataLocation(), destination.executableAddress());
+        if (call.isFlagSet(Call::Tail))
+            ARMv7Assembler::linkJump(code, call.m_label, function.value());
+        else
+            ARMv7Assembler::linkCall(code, call.m_label, function.value());
     }
 
-#if USE(MASM_PROBE)
+#if ENABLE(MASM_PROBE)
     inline TrustedImm32 trustedImm32FromPtr(void* ptr)
     {
         return TrustedImm32(TrustedImmPtr(ptr));