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Side by Side Diff: runtime/vm/assembler_ia32.cc

Issue 59773007: - Add a per-isolate pseudo random number generator to the (Closed) Base URL: http://dart.googlecode.com/svn/branches/bleeding_edge/dart/
Patch Set: Created 7 years, 1 month ago
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1 // Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file 1 // Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file
2 // for details. All rights reserved. Use of this source code is governed by a 2 // for details. All rights reserved. Use of this source code is governed by a
3 // BSD-style license that can be found in the LICENSE file. 3 // BSD-style license that can be found in the LICENSE file.
4 4
5 #include "vm/globals.h" 5 #include "vm/globals.h"
6 #if defined(TARGET_ARCH_IA32) 6 #if defined(TARGET_ARCH_IA32)
7 7
8 #include "vm/assembler.h" 8 #include "vm/assembler.h"
9 #include "vm/code_generator.h" 9 #include "vm/code_generator.h"
10 #include "vm/heap.h" 10 #include "vm/heap.h"
(...skipping 65 matching lines...) Expand 10 before | Expand all | Expand 10 after
76 public: 76 public:
77 void Process(const MemoryRegion& region, intptr_t position) { 77 void Process(const MemoryRegion& region, intptr_t position) {
78 // Direct calls are relative to the following instruction on x86. 78 // Direct calls are relative to the following instruction on x86.
79 int32_t pointer = region.Load<int32_t>(position); 79 int32_t pointer = region.Load<int32_t>(position);
80 int32_t delta = region.start() + position + sizeof(int32_t); 80 int32_t delta = region.start() + position + sizeof(int32_t);
81 region.Store<int32_t>(position, pointer - delta); 81 region.Store<int32_t>(position, pointer - delta);
82 } 82 }
83 }; 83 };
84 84
85 85
86 int32_t Assembler::jit_cookie() {
87 if (jit_cookie_ == 0) {
88 jit_cookie_ = static_cast<int32_t>(
89 Isolate::Current()->random()->NextUInt32());
90 }
91 return jit_cookie_;
92 }
93
94
86 void Assembler::InitializeMemoryWithBreakpoints(uword data, intptr_t length) { 95 void Assembler::InitializeMemoryWithBreakpoints(uword data, intptr_t length) {
87 memset(reinterpret_cast<void*>(data), Instr::kBreakPointInstruction, length); 96 memset(reinterpret_cast<void*>(data), Instr::kBreakPointInstruction, length);
88 } 97 }
89 98
90 99
91 void Assembler::call(Register reg) { 100 void Assembler::call(Register reg) {
92 AssemblerBuffer::EnsureCapacity ensured(&buffer_); 101 AssemblerBuffer::EnsureCapacity ensured(&buffer_);
93 EmitUint8(0xFF); 102 EmitUint8(0xFF);
94 EmitRegisterOperand(2, reg); 103 EmitRegisterOperand(2, reg);
95 } 104 }
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1942 EmitUint8(0xB8 + dst); 1951 EmitUint8(0xB8 + dst);
1943 buffer_.EmitObject(object); 1952 buffer_.EmitObject(object);
1944 } 1953 }
1945 } 1954 }
1946 1955
1947 1956
1948 void Assembler::LoadObjectSafely(Register dst, const Object& object) { 1957 void Assembler::LoadObjectSafely(Register dst, const Object& object) {
1949 if (Assembler::IsSafe(object)) { 1958 if (Assembler::IsSafe(object)) {
1950 LoadObject(dst, object); 1959 LoadObject(dst, object);
1951 } else { 1960 } else {
1952 movl(dst, 1961 int32_t cookie = jit_cookie();
1953 Immediate(reinterpret_cast<int32_t>(object.raw()) ^ jit_cookie_)); 1962 movl(dst, Immediate(reinterpret_cast<int32_t>(object.raw()) ^ cookie));
1954 xorl(dst, Immediate(jit_cookie_)); 1963 xorl(dst, Immediate(cookie));
1955 } 1964 }
1956 } 1965 }
1957 1966
1958 1967
1959 void Assembler::PushObject(const Object& object) { 1968 void Assembler::PushObject(const Object& object) {
1960 if (object.IsSmi() || object.InVMHeap()) { 1969 if (object.IsSmi() || object.InVMHeap()) {
1961 pushl(Immediate(reinterpret_cast<int32_t>(object.raw()))); 1970 pushl(Immediate(reinterpret_cast<int32_t>(object.raw())));
1962 } else { 1971 } else {
1963 ASSERT(object.IsNotTemporaryScopedHandle()); 1972 ASSERT(object.IsNotTemporaryScopedHandle());
1964 ASSERT(object.IsOld()); 1973 ASSERT(object.IsOld());
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2507 2516
2508 const char* Assembler::FpuRegisterName(FpuRegister reg) { 2517 const char* Assembler::FpuRegisterName(FpuRegister reg) {
2509 ASSERT((0 <= reg) && (reg < kNumberOfXmmRegisters)); 2518 ASSERT((0 <= reg) && (reg < kNumberOfXmmRegisters));
2510 return xmm_reg_names[reg]; 2519 return xmm_reg_names[reg];
2511 } 2520 }
2512 2521
2513 2522
2514 } // namespace dart 2523 } // namespace dart
2515 2524
2516 #endif // defined TARGET_ARCH_IA32 2525 #endif // defined TARGET_ARCH_IA32
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