ce45b00e4b
Internal references are absolute addresses into the instruction stream. Turn them into relative addresses when serializing and back when deserializing to keep them valid. R=bmeurer@chromium.org Review URL: https://codereview.chromium.org/976623002 Cr-Commit-Position: refs/heads/master@{#27020}
1178 lines
40 KiB
C++
1178 lines
40 KiB
C++
// Copyright (c) 1994-2006 Sun Microsystems Inc.
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// All Rights Reserved.
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// - Redistributions of source code must retain the above copyright notice,
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// this list of conditions and the following disclaimer.
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//
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// - Redistribution in binary form must reproduce the above copyright
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// notice, this list of conditions and the following disclaimer in the
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// documentation and/or other materials provided with the distribution.
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//
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// - Neither the name of Sun Microsystems or the names of contributors may
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// be used to endorse or promote products derived from this software without
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// specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
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// IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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// THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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// PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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// EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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// PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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// LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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// NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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// The original source code covered by the above license above has been
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// modified significantly by Google Inc.
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// Copyright 2012 the V8 project authors. All rights reserved.
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#ifndef V8_ASSEMBLER_H_
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#define V8_ASSEMBLER_H_
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#include "src/v8.h"
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#include "src/allocation.h"
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#include "src/builtins.h"
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#include "src/gdb-jit.h"
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#include "src/isolate.h"
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#include "src/runtime/runtime.h"
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#include "src/token.h"
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namespace v8 {
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class ApiFunction;
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namespace internal {
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class StatsCounter;
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// -----------------------------------------------------------------------------
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// Platform independent assembler base class.
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class AssemblerBase: public Malloced {
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public:
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AssemblerBase(Isolate* isolate, void* buffer, int buffer_size);
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virtual ~AssemblerBase();
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Isolate* isolate() const { return isolate_; }
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int jit_cookie() const { return jit_cookie_; }
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bool emit_debug_code() const { return emit_debug_code_; }
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void set_emit_debug_code(bool value) { emit_debug_code_ = value; }
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bool serializer_enabled() const { return serializer_enabled_; }
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void enable_serializer() { serializer_enabled_ = true; }
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bool predictable_code_size() const { return predictable_code_size_; }
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void set_predictable_code_size(bool value) { predictable_code_size_ = value; }
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uint64_t enabled_cpu_features() const { return enabled_cpu_features_; }
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void set_enabled_cpu_features(uint64_t features) {
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enabled_cpu_features_ = features;
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}
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bool IsEnabled(CpuFeature f) {
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return (enabled_cpu_features_ & (static_cast<uint64_t>(1) << f)) != 0;
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}
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bool is_ool_constant_pool_available() const {
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if (FLAG_enable_ool_constant_pool) {
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return ool_constant_pool_available_;
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} else {
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// Out-of-line constant pool not supported on this architecture.
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UNREACHABLE();
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return false;
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}
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}
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// Overwrite a host NaN with a quiet target NaN. Used by mksnapshot for
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// cross-snapshotting.
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static void QuietNaN(HeapObject* nan) { }
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int pc_offset() const { return static_cast<int>(pc_ - buffer_); }
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// This function is called when code generation is aborted, so that
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// the assembler could clean up internal data structures.
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virtual void AbortedCodeGeneration() { }
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static const int kMinimalBufferSize = 4*KB;
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protected:
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// The buffer into which code and relocation info are generated. It could
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// either be owned by the assembler or be provided externally.
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byte* buffer_;
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int buffer_size_;
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bool own_buffer_;
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void set_ool_constant_pool_available(bool available) {
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if (FLAG_enable_ool_constant_pool) {
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ool_constant_pool_available_ = available;
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} else {
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// Out-of-line constant pool not supported on this architecture.
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UNREACHABLE();
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}
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}
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// The program counter, which points into the buffer above and moves forward.
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byte* pc_;
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private:
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Isolate* isolate_;
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int jit_cookie_;
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uint64_t enabled_cpu_features_;
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bool emit_debug_code_;
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bool predictable_code_size_;
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bool serializer_enabled_;
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// Indicates whether the constant pool can be accessed, which is only possible
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// if the pp register points to the current code object's constant pool.
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bool ool_constant_pool_available_;
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// Constant pool.
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friend class FrameAndConstantPoolScope;
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friend class ConstantPoolUnavailableScope;
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};
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// Avoids emitting debug code during the lifetime of this scope object.
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class DontEmitDebugCodeScope BASE_EMBEDDED {
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public:
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explicit DontEmitDebugCodeScope(AssemblerBase* assembler)
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: assembler_(assembler), old_value_(assembler->emit_debug_code()) {
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assembler_->set_emit_debug_code(false);
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}
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~DontEmitDebugCodeScope() {
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assembler_->set_emit_debug_code(old_value_);
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}
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private:
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AssemblerBase* assembler_;
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bool old_value_;
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};
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// Avoids using instructions that vary in size in unpredictable ways between the
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// snapshot and the running VM.
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class PredictableCodeSizeScope {
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public:
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PredictableCodeSizeScope(AssemblerBase* assembler, int expected_size);
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~PredictableCodeSizeScope();
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private:
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AssemblerBase* assembler_;
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int expected_size_;
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int start_offset_;
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bool old_value_;
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};
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// Enable a specified feature within a scope.
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class CpuFeatureScope BASE_EMBEDDED {
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public:
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#ifdef DEBUG
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CpuFeatureScope(AssemblerBase* assembler, CpuFeature f);
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~CpuFeatureScope();
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private:
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AssemblerBase* assembler_;
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uint64_t old_enabled_;
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#else
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CpuFeatureScope(AssemblerBase* assembler, CpuFeature f) {}
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#endif
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};
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// CpuFeatures keeps track of which features are supported by the target CPU.
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// Supported features must be enabled by a CpuFeatureScope before use.
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// Example:
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// if (assembler->IsSupported(SSE3)) {
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// CpuFeatureScope fscope(assembler, SSE3);
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// // Generate code containing SSE3 instructions.
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// } else {
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// // Generate alternative code.
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// }
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class CpuFeatures : public AllStatic {
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public:
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static void Probe(bool cross_compile) {
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STATIC_ASSERT(NUMBER_OF_CPU_FEATURES <= kBitsPerInt);
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if (initialized_) return;
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initialized_ = true;
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ProbeImpl(cross_compile);
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}
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static unsigned SupportedFeatures() {
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Probe(false);
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return supported_;
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}
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static bool IsSupported(CpuFeature f) {
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return (supported_ & (1u << f)) != 0;
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}
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static inline bool SupportsCrankshaft();
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static inline unsigned cache_line_size() {
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DCHECK(cache_line_size_ != 0);
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return cache_line_size_;
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}
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static void PrintTarget();
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static void PrintFeatures();
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// Flush instruction cache.
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static void FlushICache(void* start, size_t size);
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private:
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// Platform-dependent implementation.
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static void ProbeImpl(bool cross_compile);
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static unsigned supported_;
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static unsigned cache_line_size_;
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static bool initialized_;
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friend class ExternalReference;
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DISALLOW_COPY_AND_ASSIGN(CpuFeatures);
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};
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// -----------------------------------------------------------------------------
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// Labels represent pc locations; they are typically jump or call targets.
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// After declaration, a label can be freely used to denote known or (yet)
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// unknown pc location. Assembler::bind() is used to bind a label to the
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// current pc. A label can be bound only once.
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class Label {
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public:
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enum Distance {
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kNear, kFar
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};
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INLINE(Label()) {
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Unuse();
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UnuseNear();
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}
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INLINE(~Label()) {
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DCHECK(!is_linked());
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DCHECK(!is_near_linked());
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}
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INLINE(void Unuse()) { pos_ = 0; }
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INLINE(void UnuseNear()) { near_link_pos_ = 0; }
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INLINE(bool is_bound() const) { return pos_ < 0; }
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INLINE(bool is_unused() const) { return pos_ == 0 && near_link_pos_ == 0; }
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INLINE(bool is_linked() const) { return pos_ > 0; }
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INLINE(bool is_near_linked() const) { return near_link_pos_ > 0; }
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// Returns the position of bound or linked labels. Cannot be used
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// for unused labels.
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int pos() const;
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int near_link_pos() const { return near_link_pos_ - 1; }
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private:
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// pos_ encodes both the binding state (via its sign)
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// and the binding position (via its value) of a label.
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//
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// pos_ < 0 bound label, pos() returns the jump target position
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// pos_ == 0 unused label
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// pos_ > 0 linked label, pos() returns the last reference position
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int pos_;
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// Behaves like |pos_| in the "> 0" case, but for near jumps to this label.
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int near_link_pos_;
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void bind_to(int pos) {
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pos_ = -pos - 1;
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DCHECK(is_bound());
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}
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void link_to(int pos, Distance distance = kFar) {
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if (distance == kNear) {
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near_link_pos_ = pos + 1;
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DCHECK(is_near_linked());
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} else {
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pos_ = pos + 1;
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DCHECK(is_linked());
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}
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}
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friend class Assembler;
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friend class Displacement;
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friend class RegExpMacroAssemblerIrregexp;
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#if V8_TARGET_ARCH_ARM64
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// On ARM64, the Assembler keeps track of pointers to Labels to resolve
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// branches to distant targets. Copying labels would confuse the Assembler.
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DISALLOW_COPY_AND_ASSIGN(Label); // NOLINT
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#endif
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};
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enum SaveFPRegsMode { kDontSaveFPRegs, kSaveFPRegs };
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// Specifies whether to perform icache flush operations on RelocInfo updates.
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// If FLUSH_ICACHE_IF_NEEDED, the icache will always be flushed if an
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// instruction was modified. If SKIP_ICACHE_FLUSH the flush will always be
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// skipped (only use this if you will flush the icache manually before it is
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// executed).
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enum ICacheFlushMode { FLUSH_ICACHE_IF_NEEDED, SKIP_ICACHE_FLUSH };
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// -----------------------------------------------------------------------------
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// Relocation information
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// Relocation information consists of the address (pc) of the datum
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// to which the relocation information applies, the relocation mode
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// (rmode), and an optional data field. The relocation mode may be
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// "descriptive" and not indicate a need for relocation, but simply
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// describe a property of the datum. Such rmodes are useful for GC
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// and nice disassembly output.
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class RelocInfo {
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public:
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// The constant kNoPosition is used with the collecting of source positions
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// in the relocation information. Two types of source positions are collected
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// "position" (RelocMode position) and "statement position" (RelocMode
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// statement_position). The "position" is collected at places in the source
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// code which are of interest when making stack traces to pin-point the source
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// location of a stack frame as close as possible. The "statement position" is
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// collected at the beginning at each statement, and is used to indicate
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// possible break locations. kNoPosition is used to indicate an
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// invalid/uninitialized position value.
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static const int kNoPosition = -1;
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// This string is used to add padding comments to the reloc info in cases
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// where we are not sure to have enough space for patching in during
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// lazy deoptimization. This is the case if we have indirect calls for which
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// we do not normally record relocation info.
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static const char* const kFillerCommentString;
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// The minimum size of a comment is equal to three bytes for the extra tagged
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// pc + the tag for the data, and kPointerSize for the actual pointer to the
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// comment.
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static const int kMinRelocCommentSize = 3 + kPointerSize;
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// The maximum size for a call instruction including pc-jump.
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static const int kMaxCallSize = 6;
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// The maximum pc delta that will use the short encoding.
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static const int kMaxSmallPCDelta;
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enum Mode {
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// Please note the order is important (see IsCodeTarget, IsGCRelocMode).
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CODE_TARGET, // Code target which is not any of the above.
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CODE_TARGET_WITH_ID,
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CONSTRUCT_CALL, // code target that is a call to a JavaScript constructor.
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DEBUG_BREAK, // Code target for the debugger statement.
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EMBEDDED_OBJECT,
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CELL,
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// Everything after runtime_entry (inclusive) is not GC'ed.
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RUNTIME_ENTRY,
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JS_RETURN, // Marks start of the ExitJSFrame code.
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COMMENT,
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POSITION, // See comment for kNoPosition above.
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STATEMENT_POSITION, // See comment for kNoPosition above.
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DEBUG_BREAK_SLOT, // Additional code inserted for debug break slot.
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EXTERNAL_REFERENCE, // The address of an external C++ function.
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INTERNAL_REFERENCE, // An address inside the same function.
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// Marks constant and veneer pools. Only used on ARM and ARM64.
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// They use a custom noncompact encoding.
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CONST_POOL,
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VENEER_POOL,
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DEOPT_REASON, // Deoptimization reason index.
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// add more as needed
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// Pseudo-types
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NUMBER_OF_MODES, // There are at most 15 modes with noncompact encoding.
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NONE32, // never recorded 32-bit value
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NONE64, // never recorded 64-bit value
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CODE_AGE_SEQUENCE, // Not stored in RelocInfo array, used explictly by
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// code aging.
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// Encoded internal reference, used only on MIPS and MIPS64.
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// Re-uses previous ARM-only encoding, to fit in RealRelocMode space.
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INTERNAL_REFERENCE_ENCODED = CONST_POOL,
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FIRST_REAL_RELOC_MODE = CODE_TARGET,
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LAST_REAL_RELOC_MODE = VENEER_POOL,
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FIRST_PSEUDO_RELOC_MODE = CODE_AGE_SEQUENCE,
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LAST_PSEUDO_RELOC_MODE = CODE_AGE_SEQUENCE,
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LAST_CODE_ENUM = DEBUG_BREAK,
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LAST_GCED_ENUM = CELL,
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// Modes <= LAST_COMPACT_ENUM are guaranteed to have compact encoding.
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LAST_COMPACT_ENUM = CODE_TARGET_WITH_ID,
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LAST_STANDARD_NONCOMPACT_ENUM = INTERNAL_REFERENCE
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};
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RelocInfo() {}
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RelocInfo(byte* pc, Mode rmode, intptr_t data, Code* host)
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: pc_(pc), rmode_(rmode), data_(data), host_(host) {
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}
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RelocInfo(byte* pc, double data64)
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: pc_(pc), rmode_(NONE64), data64_(data64), host_(NULL) {
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}
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static inline bool IsRealRelocMode(Mode mode) {
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return mode >= FIRST_REAL_RELOC_MODE &&
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mode <= LAST_REAL_RELOC_MODE;
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}
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static inline bool IsPseudoRelocMode(Mode mode) {
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DCHECK(!IsRealRelocMode(mode));
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return mode >= FIRST_PSEUDO_RELOC_MODE &&
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mode <= LAST_PSEUDO_RELOC_MODE;
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}
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static inline bool IsConstructCall(Mode mode) {
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return mode == CONSTRUCT_CALL;
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}
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static inline bool IsCodeTarget(Mode mode) {
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return mode <= LAST_CODE_ENUM;
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}
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static inline bool IsEmbeddedObject(Mode mode) {
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return mode == EMBEDDED_OBJECT;
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}
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static inline bool IsRuntimeEntry(Mode mode) {
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return mode == RUNTIME_ENTRY;
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}
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// Is the relocation mode affected by GC?
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static inline bool IsGCRelocMode(Mode mode) {
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return mode <= LAST_GCED_ENUM;
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}
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static inline bool IsJSReturn(Mode mode) {
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return mode == JS_RETURN;
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}
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static inline bool IsComment(Mode mode) {
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return mode == COMMENT;
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}
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static inline bool IsConstPool(Mode mode) {
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return mode == CONST_POOL;
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}
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static inline bool IsVeneerPool(Mode mode) {
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return mode == VENEER_POOL;
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}
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static inline bool IsDeoptReason(Mode mode) {
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return mode == DEOPT_REASON;
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}
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static inline bool IsPosition(Mode mode) {
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return mode == POSITION || mode == STATEMENT_POSITION;
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}
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static inline bool IsStatementPosition(Mode mode) {
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return mode == STATEMENT_POSITION;
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}
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static inline bool IsExternalReference(Mode mode) {
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return mode == EXTERNAL_REFERENCE;
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}
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static inline bool IsInternalReference(Mode mode) {
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return mode == INTERNAL_REFERENCE;
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}
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static inline bool IsInternalReferenceEncoded(Mode mode) {
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return mode == INTERNAL_REFERENCE_ENCODED;
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}
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static inline bool IsDebugBreakSlot(Mode mode) {
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return mode == DEBUG_BREAK_SLOT;
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}
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static inline bool IsDebuggerStatement(Mode mode) {
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return mode == DEBUG_BREAK;
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}
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static inline bool IsNone(Mode mode) {
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return mode == NONE32 || mode == NONE64;
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}
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static inline bool IsCodeAgeSequence(Mode mode) {
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return mode == CODE_AGE_SEQUENCE;
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}
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static inline int ModeMask(Mode mode) { return 1 << mode; }
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// Returns true if the first RelocInfo has the same mode and raw data as the
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// second one.
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static inline bool IsEqual(RelocInfo first, RelocInfo second) {
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return first.rmode() == second.rmode() &&
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(first.rmode() == RelocInfo::NONE64 ?
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first.raw_data64() == second.raw_data64() :
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first.data() == second.data());
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}
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// Accessors
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byte* pc() const { return pc_; }
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void set_pc(byte* pc) { pc_ = pc; }
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Mode rmode() const { return rmode_; }
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intptr_t data() const { return data_; }
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double data64() const { return data64_; }
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uint64_t raw_data64() { return bit_cast<uint64_t>(data64_); }
|
|
Code* host() const { return host_; }
|
|
void set_host(Code* host) { host_ = host; }
|
|
|
|
// Apply a relocation by delta bytes
|
|
INLINE(void apply(intptr_t delta,
|
|
ICacheFlushMode icache_flush_mode =
|
|
FLUSH_ICACHE_IF_NEEDED));
|
|
|
|
// Is the pointer this relocation info refers to coded like a plain pointer
|
|
// or is it strange in some way (e.g. relative or patched into a series of
|
|
// instructions).
|
|
bool IsCodedSpecially();
|
|
|
|
// If true, the pointer this relocation info refers to is an entry in the
|
|
// constant pool, otherwise the pointer is embedded in the instruction stream.
|
|
bool IsInConstantPool();
|
|
|
|
// Read/modify the code target in the branch/call instruction
|
|
// this relocation applies to;
|
|
// can only be called if IsCodeTarget(rmode_) || IsRuntimeEntry(rmode_)
|
|
INLINE(Address target_address());
|
|
INLINE(void set_target_address(Address target,
|
|
WriteBarrierMode write_barrier_mode =
|
|
UPDATE_WRITE_BARRIER,
|
|
ICacheFlushMode icache_flush_mode =
|
|
FLUSH_ICACHE_IF_NEEDED));
|
|
INLINE(Object* target_object());
|
|
INLINE(Handle<Object> target_object_handle(Assembler* origin));
|
|
INLINE(void set_target_object(Object* target,
|
|
WriteBarrierMode write_barrier_mode =
|
|
UPDATE_WRITE_BARRIER,
|
|
ICacheFlushMode icache_flush_mode =
|
|
FLUSH_ICACHE_IF_NEEDED));
|
|
INLINE(Address target_runtime_entry(Assembler* origin));
|
|
INLINE(void set_target_runtime_entry(Address target,
|
|
WriteBarrierMode write_barrier_mode =
|
|
UPDATE_WRITE_BARRIER,
|
|
ICacheFlushMode icache_flush_mode =
|
|
FLUSH_ICACHE_IF_NEEDED));
|
|
INLINE(Cell* target_cell());
|
|
INLINE(Handle<Cell> target_cell_handle());
|
|
INLINE(void set_target_cell(Cell* cell,
|
|
WriteBarrierMode write_barrier_mode =
|
|
UPDATE_WRITE_BARRIER,
|
|
ICacheFlushMode icache_flush_mode =
|
|
FLUSH_ICACHE_IF_NEEDED));
|
|
INLINE(Handle<Object> code_age_stub_handle(Assembler* origin));
|
|
INLINE(Code* code_age_stub());
|
|
INLINE(void set_code_age_stub(Code* stub,
|
|
ICacheFlushMode icache_flush_mode =
|
|
FLUSH_ICACHE_IF_NEEDED));
|
|
|
|
// Returns the address of the constant pool entry where the target address
|
|
// is held. This should only be called if IsInConstantPool returns true.
|
|
INLINE(Address constant_pool_entry_address());
|
|
|
|
// Read the address of the word containing the target_address in an
|
|
// instruction stream. What this means exactly is architecture-independent.
|
|
// The only architecture-independent user of this function is the serializer.
|
|
// The serializer uses it to find out how many raw bytes of instruction to
|
|
// output before the next target. Architecture-independent code shouldn't
|
|
// dereference the pointer it gets back from this.
|
|
INLINE(Address target_address_address());
|
|
|
|
// This indicates how much space a target takes up when deserializing a code
|
|
// stream. For most architectures this is just the size of a pointer. For
|
|
// an instruction like movw/movt where the target bits are mixed into the
|
|
// instruction bits the size of the target will be zero, indicating that the
|
|
// serializer should not step forwards in memory after a target is resolved
|
|
// and written. In this case the target_address_address function above
|
|
// should return the end of the instructions to be patched, allowing the
|
|
// deserializer to deserialize the instructions as raw bytes and put them in
|
|
// place, ready to be patched with the target.
|
|
INLINE(int target_address_size());
|
|
|
|
// Read the reference in the instruction this relocation
|
|
// applies to; can only be called if rmode_ is EXTERNAL_REFERENCE.
|
|
INLINE(Address target_external_reference());
|
|
|
|
// Read/modify the reference in the instruction this relocation
|
|
// applies to; can only be called if rmode_ is INTERNAL_REFERENCE.
|
|
INLINE(Address target_internal_reference());
|
|
INLINE(void set_target_internal_reference(Address target));
|
|
|
|
// Read/modify the address of a call instruction. This is used to relocate
|
|
// the break points where straight-line code is patched with a call
|
|
// instruction.
|
|
INLINE(Address call_address());
|
|
INLINE(void set_call_address(Address target));
|
|
INLINE(Object* call_object());
|
|
INLINE(void set_call_object(Object* target));
|
|
INLINE(Object** call_object_address());
|
|
|
|
// Wipe out a relocation to a fixed value, used for making snapshots
|
|
// reproducible.
|
|
INLINE(void WipeOut());
|
|
|
|
template<typename StaticVisitor> inline void Visit(Heap* heap);
|
|
inline void Visit(Isolate* isolate, ObjectVisitor* v);
|
|
|
|
// Patch the code with a call.
|
|
void PatchCodeWithCall(Address target, int guard_bytes);
|
|
|
|
// Check whether this return sequence has been patched
|
|
// with a call to the debugger.
|
|
INLINE(bool IsPatchedReturnSequence());
|
|
|
|
// Check whether this debug break slot has been patched with a call to the
|
|
// debugger.
|
|
INLINE(bool IsPatchedDebugBreakSlotSequence());
|
|
|
|
#ifdef DEBUG
|
|
// Check whether the given code contains relocation information that
|
|
// either is position-relative or movable by the garbage collector.
|
|
static bool RequiresRelocation(const CodeDesc& desc);
|
|
#endif
|
|
|
|
#ifdef ENABLE_DISASSEMBLER
|
|
// Printing
|
|
static const char* RelocModeName(Mode rmode);
|
|
void Print(Isolate* isolate, std::ostream& os); // NOLINT
|
|
#endif // ENABLE_DISASSEMBLER
|
|
#ifdef VERIFY_HEAP
|
|
void Verify(Isolate* isolate);
|
|
#endif
|
|
|
|
static const int kCodeTargetMask = (1 << (LAST_CODE_ENUM + 1)) - 1;
|
|
static const int kPositionMask = 1 << POSITION | 1 << STATEMENT_POSITION;
|
|
static const int kDataMask =
|
|
(1 << CODE_TARGET_WITH_ID) | kPositionMask | (1 << COMMENT);
|
|
static const int kApplyMask; // Modes affected by apply. Depends on arch.
|
|
|
|
private:
|
|
// On ARM, note that pc_ is the address of the constant pool entry
|
|
// to be relocated and not the address of the instruction
|
|
// referencing the constant pool entry (except when rmode_ ==
|
|
// comment).
|
|
byte* pc_;
|
|
Mode rmode_;
|
|
union {
|
|
intptr_t data_;
|
|
double data64_;
|
|
};
|
|
Code* host_;
|
|
// External-reference pointers are also split across instruction-pairs
|
|
// on some platforms, but are accessed via indirect pointers. This location
|
|
// provides a place for that pointer to exist naturally. Its address
|
|
// is returned by RelocInfo::target_reference_address().
|
|
Address reconstructed_adr_ptr_;
|
|
friend class RelocIterator;
|
|
};
|
|
|
|
|
|
// RelocInfoWriter serializes a stream of relocation info. It writes towards
|
|
// lower addresses.
|
|
class RelocInfoWriter BASE_EMBEDDED {
|
|
public:
|
|
RelocInfoWriter()
|
|
: pos_(NULL),
|
|
last_pc_(NULL),
|
|
last_id_(0),
|
|
last_position_(0),
|
|
last_mode_(RelocInfo::NUMBER_OF_MODES),
|
|
next_position_candidate_pos_delta_(0),
|
|
next_position_candidate_pc_delta_(0),
|
|
next_position_candidate_flushed_(true) {}
|
|
RelocInfoWriter(byte* pos, byte* pc)
|
|
: pos_(pos),
|
|
last_pc_(pc),
|
|
last_id_(0),
|
|
last_position_(0),
|
|
last_mode_(RelocInfo::NUMBER_OF_MODES),
|
|
next_position_candidate_pos_delta_(0),
|
|
next_position_candidate_pc_delta_(0),
|
|
next_position_candidate_flushed_(true) {}
|
|
|
|
byte* pos() const { return pos_; }
|
|
byte* last_pc() const { return last_pc_; }
|
|
|
|
void Write(const RelocInfo* rinfo);
|
|
|
|
// Update the state of the stream after reloc info buffer
|
|
// and/or code is moved while the stream is active.
|
|
void Reposition(byte* pos, byte* pc) {
|
|
pos_ = pos;
|
|
last_pc_ = pc;
|
|
}
|
|
|
|
void Finish() { FlushPosition(); }
|
|
|
|
// Max size (bytes) of a written RelocInfo. Longest encoding is
|
|
// ExtraTag, VariableLengthPCJump, ExtraTag, pc_delta, ExtraTag, data_delta.
|
|
// On ia32 and arm this is 1 + 4 + 1 + 1 + 1 + 4 = 12.
|
|
// On x64 this is 1 + 4 + 1 + 1 + 1 + 8 == 16;
|
|
// Here we use the maximum of the two.
|
|
static const int kMaxSize = 16;
|
|
|
|
private:
|
|
inline uint32_t WriteVariableLengthPCJump(uint32_t pc_delta);
|
|
inline void WriteTaggedPC(uint32_t pc_delta, int tag);
|
|
inline void WriteExtraTaggedPC(uint32_t pc_delta, int extra_tag);
|
|
inline void WriteExtraTaggedIntData(int data_delta, int top_tag);
|
|
inline void WriteExtraTaggedPoolData(int data, int pool_type);
|
|
inline void WriteExtraTaggedData(intptr_t data_delta, int top_tag);
|
|
inline void WriteTaggedData(intptr_t data_delta, int tag);
|
|
inline void WriteExtraTag(int extra_tag, int top_tag);
|
|
inline void WritePosition(int pc_delta, int pos_delta, RelocInfo::Mode rmode);
|
|
|
|
void FlushPosition();
|
|
|
|
byte* pos_;
|
|
byte* last_pc_;
|
|
int last_id_;
|
|
int last_position_;
|
|
RelocInfo::Mode last_mode_;
|
|
int next_position_candidate_pos_delta_;
|
|
uint32_t next_position_candidate_pc_delta_;
|
|
bool next_position_candidate_flushed_;
|
|
|
|
DISALLOW_COPY_AND_ASSIGN(RelocInfoWriter);
|
|
};
|
|
|
|
|
|
// A RelocIterator iterates over relocation information.
|
|
// Typical use:
|
|
//
|
|
// for (RelocIterator it(code); !it.done(); it.next()) {
|
|
// // do something with it.rinfo() here
|
|
// }
|
|
//
|
|
// A mask can be specified to skip unwanted modes.
|
|
class RelocIterator: public Malloced {
|
|
public:
|
|
// Create a new iterator positioned at
|
|
// the beginning of the reloc info.
|
|
// Relocation information with mode k is included in the
|
|
// iteration iff bit k of mode_mask is set.
|
|
explicit RelocIterator(Code* code, int mode_mask = -1);
|
|
explicit RelocIterator(const CodeDesc& desc, int mode_mask = -1);
|
|
|
|
// Iteration
|
|
bool done() const { return done_; }
|
|
void next();
|
|
|
|
// Return pointer valid until next next().
|
|
RelocInfo* rinfo() {
|
|
DCHECK(!done());
|
|
return &rinfo_;
|
|
}
|
|
|
|
private:
|
|
// Advance* moves the position before/after reading.
|
|
// *Read* reads from current byte(s) into rinfo_.
|
|
// *Get* just reads and returns info on current byte.
|
|
void Advance(int bytes = 1) { pos_ -= bytes; }
|
|
int AdvanceGetTag();
|
|
int GetExtraTag();
|
|
int GetTopTag();
|
|
void ReadTaggedPC();
|
|
void AdvanceReadPC();
|
|
void AdvanceReadId();
|
|
void AdvanceReadPoolData();
|
|
void AdvanceReadPosition();
|
|
void AdvanceReadData();
|
|
void AdvanceReadVariableLengthPCJump();
|
|
int GetLocatableTypeTag();
|
|
void ReadTaggedId();
|
|
void ReadTaggedPosition();
|
|
void ReadTaggedData();
|
|
|
|
// If the given mode is wanted, set it in rinfo_ and return true.
|
|
// Else return false. Used for efficiently skipping unwanted modes.
|
|
bool SetMode(RelocInfo::Mode mode) {
|
|
return (mode_mask_ & (1 << mode)) ? (rinfo_.rmode_ = mode, true) : false;
|
|
}
|
|
|
|
byte* pos_;
|
|
byte* end_;
|
|
byte* code_age_sequence_;
|
|
RelocInfo rinfo_;
|
|
bool done_;
|
|
int mode_mask_;
|
|
int last_id_;
|
|
int last_position_;
|
|
DISALLOW_COPY_AND_ASSIGN(RelocIterator);
|
|
};
|
|
|
|
|
|
//------------------------------------------------------------------------------
|
|
// External function
|
|
|
|
//----------------------------------------------------------------------------
|
|
class IC_Utility;
|
|
class SCTableReference;
|
|
class Debug_Address;
|
|
|
|
|
|
// An ExternalReference represents a C++ address used in the generated
|
|
// code. All references to C++ functions and variables must be encapsulated in
|
|
// an ExternalReference instance. This is done in order to track the origin of
|
|
// all external references in the code so that they can be bound to the correct
|
|
// addresses when deserializing a heap.
|
|
class ExternalReference BASE_EMBEDDED {
|
|
public:
|
|
// Used in the simulator to support different native api calls.
|
|
enum Type {
|
|
// Builtin call.
|
|
// Object* f(v8::internal::Arguments).
|
|
BUILTIN_CALL, // default
|
|
|
|
// Builtin that takes float arguments and returns an int.
|
|
// int f(double, double).
|
|
BUILTIN_COMPARE_CALL,
|
|
|
|
// Builtin call that returns floating point.
|
|
// double f(double, double).
|
|
BUILTIN_FP_FP_CALL,
|
|
|
|
// Builtin call that returns floating point.
|
|
// double f(double).
|
|
BUILTIN_FP_CALL,
|
|
|
|
// Builtin call that returns floating point.
|
|
// double f(double, int).
|
|
BUILTIN_FP_INT_CALL,
|
|
|
|
// Direct call to API function callback.
|
|
// void f(v8::FunctionCallbackInfo&)
|
|
DIRECT_API_CALL,
|
|
|
|
// Call to function callback via InvokeFunctionCallback.
|
|
// void f(v8::FunctionCallbackInfo&, v8::FunctionCallback)
|
|
PROFILING_API_CALL,
|
|
|
|
// Direct call to accessor getter callback.
|
|
// void f(Local<Name> property, PropertyCallbackInfo& info)
|
|
DIRECT_GETTER_CALL,
|
|
|
|
// Call to accessor getter callback via InvokeAccessorGetterCallback.
|
|
// void f(Local<Name> property, PropertyCallbackInfo& info,
|
|
// AccessorNameGetterCallback callback)
|
|
PROFILING_GETTER_CALL
|
|
};
|
|
|
|
static void SetUp();
|
|
static void InitializeMathExpData();
|
|
static void TearDownMathExpData();
|
|
|
|
typedef void* ExternalReferenceRedirector(void* original, Type type);
|
|
|
|
ExternalReference() : address_(NULL) {}
|
|
|
|
ExternalReference(Builtins::CFunctionId id, Isolate* isolate);
|
|
|
|
ExternalReference(ApiFunction* ptr, Type type, Isolate* isolate);
|
|
|
|
ExternalReference(Builtins::Name name, Isolate* isolate);
|
|
|
|
ExternalReference(Runtime::FunctionId id, Isolate* isolate);
|
|
|
|
ExternalReference(const Runtime::Function* f, Isolate* isolate);
|
|
|
|
ExternalReference(const IC_Utility& ic_utility, Isolate* isolate);
|
|
|
|
explicit ExternalReference(StatsCounter* counter);
|
|
|
|
ExternalReference(Isolate::AddressId id, Isolate* isolate);
|
|
|
|
explicit ExternalReference(const SCTableReference& table_ref);
|
|
|
|
// Isolate as an external reference.
|
|
static ExternalReference isolate_address(Isolate* isolate);
|
|
|
|
// One-of-a-kind references. These references are not part of a general
|
|
// pattern. This means that they have to be added to the
|
|
// ExternalReferenceTable in serialize.cc manually.
|
|
|
|
static ExternalReference incremental_marking_record_write_function(
|
|
Isolate* isolate);
|
|
static ExternalReference store_buffer_overflow_function(
|
|
Isolate* isolate);
|
|
static ExternalReference flush_icache_function(Isolate* isolate);
|
|
static ExternalReference delete_handle_scope_extensions(Isolate* isolate);
|
|
|
|
static ExternalReference get_date_field_function(Isolate* isolate);
|
|
static ExternalReference date_cache_stamp(Isolate* isolate);
|
|
|
|
static ExternalReference get_make_code_young_function(Isolate* isolate);
|
|
static ExternalReference get_mark_code_as_executed_function(Isolate* isolate);
|
|
|
|
// Deoptimization support.
|
|
static ExternalReference new_deoptimizer_function(Isolate* isolate);
|
|
static ExternalReference compute_output_frames_function(Isolate* isolate);
|
|
|
|
// Log support.
|
|
static ExternalReference log_enter_external_function(Isolate* isolate);
|
|
static ExternalReference log_leave_external_function(Isolate* isolate);
|
|
|
|
// Static data in the keyed lookup cache.
|
|
static ExternalReference keyed_lookup_cache_keys(Isolate* isolate);
|
|
static ExternalReference keyed_lookup_cache_field_offsets(Isolate* isolate);
|
|
|
|
// Static variable Heap::roots_array_start()
|
|
static ExternalReference roots_array_start(Isolate* isolate);
|
|
|
|
// Static variable Heap::allocation_sites_list_address()
|
|
static ExternalReference allocation_sites_list_address(Isolate* isolate);
|
|
|
|
// Static variable StackGuard::address_of_jslimit()
|
|
static ExternalReference address_of_stack_limit(Isolate* isolate);
|
|
|
|
// Static variable StackGuard::address_of_real_jslimit()
|
|
static ExternalReference address_of_real_stack_limit(Isolate* isolate);
|
|
|
|
// Static variable RegExpStack::limit_address()
|
|
static ExternalReference address_of_regexp_stack_limit(Isolate* isolate);
|
|
|
|
// Static variables for RegExp.
|
|
static ExternalReference address_of_static_offsets_vector(Isolate* isolate);
|
|
static ExternalReference address_of_regexp_stack_memory_address(
|
|
Isolate* isolate);
|
|
static ExternalReference address_of_regexp_stack_memory_size(
|
|
Isolate* isolate);
|
|
|
|
// Static variable Heap::NewSpaceStart()
|
|
static ExternalReference new_space_start(Isolate* isolate);
|
|
static ExternalReference new_space_mask(Isolate* isolate);
|
|
|
|
// Write barrier.
|
|
static ExternalReference store_buffer_top(Isolate* isolate);
|
|
|
|
// Used for fast allocation in generated code.
|
|
static ExternalReference new_space_allocation_top_address(Isolate* isolate);
|
|
static ExternalReference new_space_allocation_limit_address(Isolate* isolate);
|
|
static ExternalReference old_pointer_space_allocation_top_address(
|
|
Isolate* isolate);
|
|
static ExternalReference old_pointer_space_allocation_limit_address(
|
|
Isolate* isolate);
|
|
static ExternalReference old_data_space_allocation_top_address(
|
|
Isolate* isolate);
|
|
static ExternalReference old_data_space_allocation_limit_address(
|
|
Isolate* isolate);
|
|
|
|
static ExternalReference mod_two_doubles_operation(Isolate* isolate);
|
|
static ExternalReference power_double_double_function(Isolate* isolate);
|
|
static ExternalReference power_double_int_function(Isolate* isolate);
|
|
|
|
static ExternalReference handle_scope_next_address(Isolate* isolate);
|
|
static ExternalReference handle_scope_limit_address(Isolate* isolate);
|
|
static ExternalReference handle_scope_level_address(Isolate* isolate);
|
|
|
|
static ExternalReference scheduled_exception_address(Isolate* isolate);
|
|
static ExternalReference address_of_pending_message_obj(Isolate* isolate);
|
|
static ExternalReference address_of_has_pending_message(Isolate* isolate);
|
|
static ExternalReference address_of_pending_message_script(Isolate* isolate);
|
|
|
|
// Static variables containing common double constants.
|
|
static ExternalReference address_of_min_int();
|
|
static ExternalReference address_of_one_half();
|
|
static ExternalReference address_of_minus_one_half();
|
|
static ExternalReference address_of_negative_infinity();
|
|
static ExternalReference address_of_the_hole_nan();
|
|
static ExternalReference address_of_uint32_bias();
|
|
|
|
static ExternalReference math_log_double_function(Isolate* isolate);
|
|
|
|
static ExternalReference math_exp_constants(int constant_index);
|
|
static ExternalReference math_exp_log_table();
|
|
|
|
static ExternalReference page_flags(Page* page);
|
|
|
|
static ExternalReference ForDeoptEntry(Address entry);
|
|
|
|
static ExternalReference cpu_features();
|
|
|
|
static ExternalReference debug_is_active_address(Isolate* isolate);
|
|
static ExternalReference debug_after_break_target_address(Isolate* isolate);
|
|
static ExternalReference debug_restarter_frame_function_pointer_address(
|
|
Isolate* isolate);
|
|
|
|
static ExternalReference is_profiling_address(Isolate* isolate);
|
|
static ExternalReference invoke_function_callback(Isolate* isolate);
|
|
static ExternalReference invoke_accessor_getter_callback(Isolate* isolate);
|
|
|
|
Address address() const { return reinterpret_cast<Address>(address_); }
|
|
|
|
// Function Debug::Break()
|
|
static ExternalReference debug_break(Isolate* isolate);
|
|
|
|
// Used to check if single stepping is enabled in generated code.
|
|
static ExternalReference debug_step_in_fp_address(Isolate* isolate);
|
|
|
|
#ifndef V8_INTERPRETED_REGEXP
|
|
// C functions called from RegExp generated code.
|
|
|
|
// Function NativeRegExpMacroAssembler::CaseInsensitiveCompareUC16()
|
|
static ExternalReference re_case_insensitive_compare_uc16(Isolate* isolate);
|
|
|
|
// Function RegExpMacroAssembler*::CheckStackGuardState()
|
|
static ExternalReference re_check_stack_guard_state(Isolate* isolate);
|
|
|
|
// Function NativeRegExpMacroAssembler::GrowStack()
|
|
static ExternalReference re_grow_stack(Isolate* isolate);
|
|
|
|
// byte NativeRegExpMacroAssembler::word_character_bitmap
|
|
static ExternalReference re_word_character_map();
|
|
|
|
#endif
|
|
|
|
// This lets you register a function that rewrites all external references.
|
|
// Used by the ARM simulator to catch calls to external references.
|
|
static void set_redirector(Isolate* isolate,
|
|
ExternalReferenceRedirector* redirector) {
|
|
// We can't stack them.
|
|
DCHECK(isolate->external_reference_redirector() == NULL);
|
|
isolate->set_external_reference_redirector(
|
|
reinterpret_cast<ExternalReferenceRedirectorPointer*>(redirector));
|
|
}
|
|
|
|
static ExternalReference stress_deopt_count(Isolate* isolate);
|
|
|
|
private:
|
|
explicit ExternalReference(void* address)
|
|
: address_(address) {}
|
|
|
|
static void* Redirect(Isolate* isolate,
|
|
Address address_arg,
|
|
Type type = ExternalReference::BUILTIN_CALL) {
|
|
ExternalReferenceRedirector* redirector =
|
|
reinterpret_cast<ExternalReferenceRedirector*>(
|
|
isolate->external_reference_redirector());
|
|
void* address = reinterpret_cast<void*>(address_arg);
|
|
void* answer = (redirector == NULL) ?
|
|
address :
|
|
(*redirector)(address, type);
|
|
return answer;
|
|
}
|
|
|
|
void* address_;
|
|
};
|
|
|
|
bool operator==(ExternalReference, ExternalReference);
|
|
bool operator!=(ExternalReference, ExternalReference);
|
|
|
|
size_t hash_value(ExternalReference);
|
|
|
|
std::ostream& operator<<(std::ostream&, ExternalReference);
|
|
|
|
|
|
// -----------------------------------------------------------------------------
|
|
// Position recording support
|
|
|
|
struct PositionState {
|
|
PositionState() : current_position(RelocInfo::kNoPosition),
|
|
written_position(RelocInfo::kNoPosition),
|
|
current_statement_position(RelocInfo::kNoPosition),
|
|
written_statement_position(RelocInfo::kNoPosition) {}
|
|
|
|
int current_position;
|
|
int written_position;
|
|
|
|
int current_statement_position;
|
|
int written_statement_position;
|
|
};
|
|
|
|
|
|
class PositionsRecorder BASE_EMBEDDED {
|
|
public:
|
|
explicit PositionsRecorder(Assembler* assembler)
|
|
: assembler_(assembler) {
|
|
jit_handler_data_ = NULL;
|
|
}
|
|
|
|
void AttachJITHandlerData(void* user_data) {
|
|
jit_handler_data_ = user_data;
|
|
}
|
|
|
|
void* DetachJITHandlerData() {
|
|
void* old_data = jit_handler_data_;
|
|
jit_handler_data_ = NULL;
|
|
return old_data;
|
|
}
|
|
// Set current position to pos.
|
|
void RecordPosition(int pos);
|
|
|
|
// Set current statement position to pos.
|
|
void RecordStatementPosition(int pos);
|
|
|
|
// Write recorded positions to relocation information.
|
|
bool WriteRecordedPositions();
|
|
|
|
int current_position() const { return state_.current_position; }
|
|
|
|
int current_statement_position() const {
|
|
return state_.current_statement_position;
|
|
}
|
|
|
|
private:
|
|
Assembler* assembler_;
|
|
PositionState state_;
|
|
|
|
// Currently jit_handler_data_ is used to store JITHandler-specific data
|
|
// over the lifetime of a PositionsRecorder
|
|
void* jit_handler_data_;
|
|
friend class PreservePositionScope;
|
|
|
|
DISALLOW_COPY_AND_ASSIGN(PositionsRecorder);
|
|
};
|
|
|
|
|
|
class PreservePositionScope BASE_EMBEDDED {
|
|
public:
|
|
explicit PreservePositionScope(PositionsRecorder* positions_recorder)
|
|
: positions_recorder_(positions_recorder),
|
|
saved_state_(positions_recorder->state_) {}
|
|
|
|
~PreservePositionScope() {
|
|
positions_recorder_->state_ = saved_state_;
|
|
}
|
|
|
|
private:
|
|
PositionsRecorder* positions_recorder_;
|
|
const PositionState saved_state_;
|
|
|
|
DISALLOW_COPY_AND_ASSIGN(PreservePositionScope);
|
|
};
|
|
|
|
|
|
// -----------------------------------------------------------------------------
|
|
// Utility functions
|
|
|
|
inline int NumberOfBitsSet(uint32_t x) {
|
|
unsigned int num_bits_set;
|
|
for (num_bits_set = 0; x; x >>= 1) {
|
|
num_bits_set += x & 1;
|
|
}
|
|
return num_bits_set;
|
|
}
|
|
|
|
bool EvalComparison(Token::Value op, double op1, double op2);
|
|
|
|
// Computes pow(x, y) with the special cases in the spec for Math.pow.
|
|
double power_helper(double x, double y);
|
|
double power_double_int(double x, int y);
|
|
double power_double_double(double x, double y);
|
|
|
|
// Helper class for generating code or data associated with the code
|
|
// right after a call instruction. As an example this can be used to
|
|
// generate safepoint data after calls for crankshaft.
|
|
class CallWrapper {
|
|
public:
|
|
CallWrapper() { }
|
|
virtual ~CallWrapper() { }
|
|
// Called just before emitting a call. Argument is the size of the generated
|
|
// call code.
|
|
virtual void BeforeCall(int call_size) const = 0;
|
|
// Called just after emitting a call, i.e., at the return site for the call.
|
|
virtual void AfterCall() const = 0;
|
|
};
|
|
|
|
class NullCallWrapper : public CallWrapper {
|
|
public:
|
|
NullCallWrapper() { }
|
|
virtual ~NullCallWrapper() { }
|
|
virtual void BeforeCall(int call_size) const { }
|
|
virtual void AfterCall() const { }
|
|
};
|
|
|
|
|
|
} } // namespace v8::internal
|
|
|
|
#endif // V8_ASSEMBLER_H_
|