Ryan Macnak
830bfe61b7
dart2js ARM -10.3% size R=fschneider@google.com Review URL: https://codereview.chromium.org/1418863003 .
345 lines
10 KiB
C++
345 lines
10 KiB
C++
// Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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#include "vm/globals.h" // Needed here to get TARGET_ARCH_X64.
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#if defined(TARGET_ARCH_X64)
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#include "vm/assembler.h"
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#include "vm/code_patcher.h"
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#include "vm/cpu.h"
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#include "vm/dart_entry.h"
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#include "vm/flow_graph_compiler.h"
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#include "vm/instructions.h"
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#include "vm/object.h"
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#include "vm/raw_object.h"
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namespace dart {
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static bool MatchesPattern(uword addr, int16_t* pattern, intptr_t size) {
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uint8_t* bytes = reinterpret_cast<uint8_t*>(addr);
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for (intptr_t i = 0; i < size; i++) {
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int16_t val = pattern[i];
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if ((val >= 0) && (val != bytes[i])) {
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return false;
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}
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}
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return true;
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}
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intptr_t IndexFromPPLoad(uword start) {
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int32_t offset = *reinterpret_cast<int32_t*>(start);
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return ObjectPool::IndexFromOffset(offset);
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}
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class UnoptimizedCall : public ValueObject {
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public:
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UnoptimizedCall(uword return_address, const Code& code)
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: object_pool_(ObjectPool::Handle(code.GetObjectPool())),
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start_(return_address - kCallPatternSize) {
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ASSERT((kCallPatternSize - 7) == Assembler::kCallExternalLabelSize);
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ASSERT(IsValid());
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}
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static const int kCallPatternSize = 22;
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bool IsValid() const {
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static int16_t pattern[kCallPatternSize] = {
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0x49, 0x8b, 0x9f, -1, -1, -1, -1, // movq RBX, [PP + offs]
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0x4d, 0x8b, 0xa7, -1, -1, -1, -1, // movq CR, [PP + offs]
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0x4d, 0x8b, 0x5c, 0x24, 0x07, // movq TMP, [CR + entry_point_offs]
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0x41, 0xff, 0xd3 // callq TMP
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};
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return MatchesPattern(start_, pattern, kCallPatternSize);
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}
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intptr_t argument_index() const {
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return IndexFromPPLoad(start_ + 3);
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}
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RawObject* ic_data() const {
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return object_pool_.ObjectAt(argument_index());
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}
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RawCode* target() const {
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intptr_t index = IndexFromPPLoad(start_ + 10);
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Code& code = Code::Handle();
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code ^= object_pool_.ObjectAt(index);
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return code.raw();
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}
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void set_target(const Code& target) const {
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intptr_t index = IndexFromPPLoad(start_ + 10);
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object_pool_.SetObjectAt(index, target);
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// No need to flush the instruction cache, since the code is not modified.
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}
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protected:
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const ObjectPool& object_pool_;
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private:
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uword start_;
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DISALLOW_IMPLICIT_CONSTRUCTORS(UnoptimizedCall);
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};
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class NativeCall : public UnoptimizedCall {
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public:
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NativeCall(uword return_address, const Code& code)
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: UnoptimizedCall(return_address, code) {
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}
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NativeFunction native_function() const {
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return reinterpret_cast<NativeFunction>(
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object_pool_.RawValueAt(argument_index()));
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}
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void set_native_function(NativeFunction func) const {
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object_pool_.SetRawValueAt(argument_index(),
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reinterpret_cast<uword>(func));
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}
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private:
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DISALLOW_IMPLICIT_CONSTRUCTORS(NativeCall);
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};
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class InstanceCall : public UnoptimizedCall {
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public:
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InstanceCall(uword return_address, const Code& code)
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: UnoptimizedCall(return_address, code) {
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#if defined(DEBUG)
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ICData& test_ic_data = ICData::Handle();
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test_ic_data ^= ic_data();
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ASSERT(test_ic_data.NumArgsTested() > 0);
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#endif // DEBUG
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}
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private:
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DISALLOW_IMPLICIT_CONSTRUCTORS(InstanceCall);
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};
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class UnoptimizedStaticCall : public UnoptimizedCall {
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public:
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UnoptimizedStaticCall(uword return_address, const Code& code)
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: UnoptimizedCall(return_address, code) {
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#if defined(DEBUG)
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ICData& test_ic_data = ICData::Handle();
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test_ic_data ^= ic_data();
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ASSERT(test_ic_data.NumArgsTested() >= 0);
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#endif // DEBUG
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}
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private:
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DISALLOW_IMPLICIT_CONSTRUCTORS(UnoptimizedStaticCall);
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};
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// The expected pattern of a call where the target is loaded from
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// the object pool.
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class PoolPointerCall : public ValueObject {
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public:
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explicit PoolPointerCall(uword return_address, const Code& code)
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: start_(return_address - kCallPatternSize),
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object_pool_(ObjectPool::Handle(code.GetObjectPool())) {
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ASSERT(IsValid());
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}
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static const int kCallPatternSize = 15;
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bool IsValid() const {
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static int16_t pattern[kCallPatternSize] = {
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0x4d, 0x8b, 0xa7, -1, -1, -1, -1, // movq CR, [PP + offs]
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0x4d, 0x8b, 0x5c, 0x24, 0x07, // movq TMP, [CR + entry_point_off]
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0x41, 0xff, 0xd3 // callq TMP
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};
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return MatchesPattern(start_, pattern, kCallPatternSize);
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}
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intptr_t pp_index() const {
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return IndexFromPPLoad(start_ + 3);
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}
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RawCode* Target() const {
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Code& code = Code::Handle();
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code ^= object_pool_.ObjectAt(pp_index());
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return code.raw();
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}
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void SetTarget(const Code& target) const {
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object_pool_.SetObjectAt(pp_index(), target);
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// No need to flush the instruction cache, since the code is not modified.
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}
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protected:
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uword start_;
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const ObjectPool& object_pool_;
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private:
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DISALLOW_IMPLICIT_CONSTRUCTORS(PoolPointerCall);
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};
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// Instance call that can switch from an IC call to a megamorphic call
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// load ICData load MegamorphicCache
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// call ICLookup stub -> call MegamorphicLookup stub
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// call target call target
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class SwitchableCall : public ValueObject {
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public:
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SwitchableCall(uword return_address, const Code& code)
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: start_(return_address - kCallPatternSize),
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object_pool_(ObjectPool::Handle(code.GetObjectPool())) {
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ASSERT(IsValid());
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}
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static const int kCallPatternSize = 24;
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bool IsValid() const {
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static int16_t pattern[kCallPatternSize] = {
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0x49, 0x8b, 0x9f, -1, -1, -1, -1, // movq rbx, [PP + cache_offs]
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0x4d, 0x8b, 0xa7, -1, -1, -1, -1, // movq r12, [PP + code_offs]
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0x4d, 0x8b, 0x5c, 0x24, 0x07, // movq r11, [r12 + entrypoint_off]
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0x41, 0xff, 0xd3, // call r11
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0xff, 0xd1, // call rcx
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};
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return MatchesPattern(start_, pattern, kCallPatternSize);
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}
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intptr_t cache_index() const {
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return IndexFromPPLoad(start_ + 3);
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}
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intptr_t lookup_stub_index() const {
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return IndexFromPPLoad(start_ + 10);
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}
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RawObject* cache() const {
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return object_pool_.ObjectAt(cache_index());
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}
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void SetCache(const MegamorphicCache& cache) const {
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ASSERT(Object::Handle(object_pool_.ObjectAt(cache_index())).IsICData());
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object_pool_.SetObjectAt(cache_index(), cache);
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// No need to flush the instruction cache, since the code is not modified.
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}
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void SetLookupStub(const Code& lookup_stub) const {
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ASSERT(Object::Handle(object_pool_.ObjectAt(lookup_stub_index())).IsCode());
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object_pool_.SetObjectAt(lookup_stub_index(), lookup_stub);
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// No need to flush the instruction cache, since the code is not modified.
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}
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protected:
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uword start_;
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const ObjectPool& object_pool_;
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private:
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DISALLOW_IMPLICIT_CONSTRUCTORS(SwitchableCall);
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};
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RawCode* CodePatcher::GetStaticCallTargetAt(uword return_address,
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const Code& code) {
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ASSERT(code.ContainsInstructionAt(return_address));
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PoolPointerCall call(return_address, code);
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return call.Target();
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}
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void CodePatcher::PatchStaticCallAt(uword return_address,
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const Code& code,
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const Code& new_target) {
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PatchPoolPointerCallAt(return_address, code, new_target);
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}
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void CodePatcher::PatchPoolPointerCallAt(uword return_address,
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const Code& code,
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const Code& new_target) {
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ASSERT(code.ContainsInstructionAt(return_address));
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PoolPointerCall call(return_address, code);
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call.SetTarget(new_target);
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}
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RawCode* CodePatcher::GetInstanceCallAt(uword return_address,
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const Code& code,
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ICData* ic_data) {
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ASSERT(code.ContainsInstructionAt(return_address));
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InstanceCall call(return_address, code);
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if (ic_data != NULL) {
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*ic_data ^= call.ic_data();
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}
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return call.target();
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}
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intptr_t CodePatcher::InstanceCallSizeInBytes() {
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return InstanceCall::kCallPatternSize;
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}
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void CodePatcher::InsertDeoptimizationCallAt(uword start, uword target) {
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// The inserted call should not overlap the lazy deopt jump code.
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ASSERT(start + ShortCallPattern::pattern_length_in_bytes() <= target);
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*reinterpret_cast<uint8_t*>(start) = 0xE8;
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ShortCallPattern call(start);
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call.SetTargetAddress(target);
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CPU::FlushICache(start, ShortCallPattern::pattern_length_in_bytes());
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}
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RawFunction* CodePatcher::GetUnoptimizedStaticCallAt(
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uword return_address, const Code& code, ICData* ic_data_result) {
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ASSERT(code.ContainsInstructionAt(return_address));
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UnoptimizedStaticCall static_call(return_address, code);
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ICData& ic_data = ICData::Handle();
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ic_data ^= static_call.ic_data();
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if (ic_data_result != NULL) {
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*ic_data_result = ic_data.raw();
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}
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return ic_data.GetTargetAt(0);
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}
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void CodePatcher::PatchSwitchableCallAt(uword return_address,
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const Code& code,
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const ICData& ic_data,
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const MegamorphicCache& cache,
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const Code& lookup_stub) {
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ASSERT(code.ContainsInstructionAt(return_address));
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SwitchableCall call(return_address, code);
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ASSERT(call.cache() == ic_data.raw());
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call.SetLookupStub(lookup_stub);
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call.SetCache(cache);
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}
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void CodePatcher::PatchNativeCallAt(uword return_address,
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const Code& code,
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NativeFunction target,
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const Code& trampoline) {
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ASSERT(code.ContainsInstructionAt(return_address));
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NativeCall call(return_address, code);
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call.set_target(trampoline);
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call.set_native_function(target);
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}
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RawCode* CodePatcher::GetNativeCallAt(uword return_address,
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const Code& code,
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NativeFunction* target) {
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ASSERT(code.ContainsInstructionAt(return_address));
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NativeCall call(return_address, code);
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*target = call.native_function();
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return call.target();
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}
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} // namespace dart
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#endif // defined TARGET_ARCH_X64
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