2008-07-03 15:10:15 +00:00
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// 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 2006-2008 Google Inc. All Rights Reserved.
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#ifndef V8_ASSEMBLER_H_
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#define V8_ASSEMBLER_H_
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#include "runtime.h"
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#include "top.h"
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#include "zone-inl.h"
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namespace v8 { namespace internal {
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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 : public ZoneObject { // ShadowLables are dynamically allocated.
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public:
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INLINE(Label()) { Unuse(); }
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INLINE(~Label()) { ASSERT(!is_linked()); }
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INLINE(void Unuse()) { 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; }
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INLINE(bool is_linked() const) { return 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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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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void bind_to(int pos) {
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pos_ = -pos - 1;
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ASSERT(is_bound());
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}
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void link_to(int pos) {
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pos_ = pos + 1;
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ASSERT(is_linked());
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}
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friend class Assembler;
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friend class Displacement;
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friend class LabelShadow;
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};
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// A LabelShadow is a label that temporarily shadows another label. It
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// is used to catch linking and binding of labels in certain scopes,
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// e.g. try blocks. LabelShadows are themselves labels which can be
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// used (only) after they are not shadowing anymore.
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class LabelShadow: public Label {
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public:
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explicit LabelShadow(Label* shadowed) {
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ASSERT(shadowed != NULL);
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shadowed_ = shadowed;
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shadowed_pos_ = shadowed->pos_;
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shadowed->Unuse();
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#ifdef DEBUG
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is_shadowing_ = true;
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#endif
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}
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~LabelShadow() {
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ASSERT(!is_shadowing_);
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}
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void StopShadowing() {
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ASSERT(is_shadowing_ && is_unused());
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pos_ = shadowed_->pos_;
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shadowed_->pos_ = shadowed_pos_;
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#ifdef DEBUG
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is_shadowing_ = false;
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#endif
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}
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Label* shadowed() const { return shadowed_; }
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private:
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Label* shadowed_;
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int shadowed_pos_;
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#ifdef DEBUG
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bool is_shadowing_;
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#endif
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};
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// -----------------------------------------------------------------------------
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// Relocation information
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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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enum RelocMode {
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2008-07-30 08:49:36 +00:00
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// Please note the order is important (see is_code_target, is_gc_reloc_mode).
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2008-07-03 15:10:15 +00:00
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js_construct_call, // code target that is an exit JavaScript frame stub.
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exit_js_frame, // code target that is an exit JavaScript frame stub.
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code_target_context, // code target used for contextual loads.
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code_target, // code target which is not any of the above.
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embedded_object,
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embedded_string,
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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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external_reference, // The address of an external C++ function.
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// add more as needed
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no_reloc, // never recorded
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// Pseudo-types
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reloc_mode_count,
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2008-07-30 08:49:36 +00:00
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last_code_enum = code_target,
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last_gced_enum = embedded_string
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2008-07-03 15:10:15 +00:00
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};
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inline int RelocMask(RelocMode mode) {
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return 1 << mode;
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}
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inline bool is_js_construct_call(RelocMode mode) {
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return mode == js_construct_call;
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}
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inline bool is_exit_js_frame(RelocMode mode) {
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return mode == exit_js_frame;
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}
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inline bool is_code_target(RelocMode mode) {
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return mode <= last_code_enum;
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}
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2008-07-30 08:49:36 +00:00
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// Is the relocation mode affected by GC?
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inline bool is_gc_reloc_mode(RelocMode mode) {
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return mode <= last_gced_enum;
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}
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2008-07-03 15:10:15 +00:00
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inline bool is_js_return(RelocMode mode) {
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return mode == js_return;
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}
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inline bool is_comment(RelocMode mode) {
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return mode == comment;
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}
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inline bool is_position(RelocMode mode) {
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return mode == position || mode == statement_position;
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}
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inline bool is_statement_position(RelocMode mode) {
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return mode == statement_position;
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}
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inline bool is_external_reference(RelocMode mode) {
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return mode == external_reference;
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}
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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 BASE_EMBEDDED {
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public:
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RelocInfo() {}
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RelocInfo(byte* pc, RelocMode rmode, intptr_t data)
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: pc_(pc), rmode_(rmode), data_(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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RelocMode rmode() const { return rmode_; }
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intptr_t data() const { return data_; }
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// Apply a relocation by delta bytes
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INLINE(void apply(int delta));
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// Read/modify the code target in the branch/call instruction this relocation
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// applies to; can only be called if this->is_code_target(rmode_)
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INLINE(Address target_address());
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INLINE(void set_target_address(Address target));
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INLINE(Object* target_object());
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INLINE(Object** target_object_address());
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INLINE(void set_target_object(Object* target));
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// Read/modify the reference in the instruction this relocation
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// applies to; can only be called if rmode_ is external_reference
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INLINE(Address* target_reference_address());
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// Read/modify the address of a call instruction. This is used to relocate
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// the break points where straight-line code is patched with a call
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// instruction.
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INLINE(Address call_address());
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INLINE(void set_call_address(Address target));
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INLINE(Object* call_object());
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INLINE(Object** call_object_address());
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INLINE(void set_call_object(Object* target));
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// Patch the code with some other code.
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void patch_code(byte* instructions, int instruction_count);
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// Patch the code with a call.
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void patch_code_with_call(Address target, int guard_bytes);
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INLINE(bool is_call_instruction());
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2008-08-06 10:02:49 +00:00
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#ifdef ENABLE_DISASSEMBLER
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// Printing
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static const char* RelocModeName(RelocMode rmode);
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2008-08-13 09:32:07 +00:00
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void Print();
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2008-08-06 10:02:49 +00:00
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#endif // ENABLE_DISASSEMBLER
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2008-07-03 15:10:15 +00:00
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#ifdef DEBUG
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// Debugging
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void Verify();
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#endif
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static const int kCodeTargetMask = (1 << (last_code_enum + 1)) - 1;
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static const int kPositionMask = 1 << position | 1 << statement_position;
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static const int kDebugMask = kPositionMask | 1 << comment;
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static const int kApplyMask; // Modes affected by apply. Depends on arch.
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private:
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// On ARM, note that pc_ is the address of the constant pool entry
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// to be relocated and not the address of the instruction
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// referencing the constant pool entry (except when rmode_ ==
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// comment).
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byte* pc_;
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RelocMode rmode_;
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intptr_t data_;
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friend class RelocIterator;
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};
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// RelocInfoWriter serializes a stream of relocation info. It writes towards
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// lower addresses.
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class RelocInfoWriter BASE_EMBEDDED {
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public:
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RelocInfoWriter() : pos_(NULL), last_pc_(NULL), last_data_(0) {}
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RelocInfoWriter(byte* pos, byte* pc) : pos_(pos), last_pc_(pc),
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last_data_(0) {}
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byte* pos() const { return pos_; }
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byte* last_pc() const { return last_pc_; }
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void Write(const RelocInfo* rinfo);
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// Update the state of the stream after reloc info buffer
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// and/or code is moved while the stream is active.
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void Reposition(byte* pos, byte* pc) {
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pos_ = pos;
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last_pc_ = pc;
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}
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// Max size (bytes) of a written RelocInfo.
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static const int kMaxSize = 12;
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private:
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inline uint32_t WriteVariableLengthPCJump(uint32_t pc_delta);
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inline void WriteTaggedPC(uint32_t pc_delta, int tag);
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inline void WriteExtraTaggedPC(uint32_t pc_delta, int extra_tag);
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inline void WriteExtraTaggedData(int32_t data_delta, int top_tag);
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inline void WriteTaggedData(int32_t data_delta, int tag);
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inline void WriteExtraTag(int extra_tag, int top_tag);
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byte* pos_;
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byte* last_pc_;
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intptr_t last_data_;
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DISALLOW_EVIL_CONSTRUCTORS(RelocInfoWriter);
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};
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// A RelocIterator iterates over relocation information.
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// Typical use:
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//
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// for (RelocIterator it(code); !it.done(); it.next()) {
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// // do something with it.rinfo() here
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// }
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//
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// A mask can be specified to skip unwanted modes.
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class RelocIterator: public Malloced {
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public:
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// Create a new iterator positioned at
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// the beginning of the reloc info.
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// Relocation information with mode k is included in the
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// iteration iff bit k of mode_mask is set.
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explicit RelocIterator(Code* code, int mode_mask = -1);
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explicit RelocIterator(const CodeDesc& desc, int mode_mask = -1);
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// Iteration
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bool done() const { return done_; }
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void next();
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// Return pointer valid until next next().
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RelocInfo* rinfo() {
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ASSERT(!done());
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return &rinfo_;
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}
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private:
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// Advance* moves the position before/after reading.
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// *Read* reads from current byte(s) into rinfo_.
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// *Get* just reads and returns info on current byte.
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void Advance(int bytes = 1) { pos_ -= bytes; }
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int AdvanceGetTag();
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int GetExtraTag();
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int GetTopTag();
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void ReadTaggedPC();
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void AdvanceReadPC();
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void AdvanceReadData();
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void AdvanceReadVariableLengthPCJump();
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int GetPositionTypeTag();
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void ReadTaggedData();
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static RelocMode DebugInfoModeFromTag(int tag);
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// If the given mode is wanted, set it in rinfo_ and return true.
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// Else return false. Used for efficiently skipping unwanted modes.
|
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bool SetMode(RelocMode mode) {
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|
return (mode_mask_ & 1 << mode) ? (rinfo_.rmode_ = mode, true) : false;
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}
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byte* pos_;
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byte* end_;
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RelocInfo rinfo_;
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bool done_;
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int mode_mask_;
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DISALLOW_EVIL_CONSTRUCTORS(RelocIterator);
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};
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//------------------------------------------------------------------------------
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// External function
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//----------------------------------------------------------------------------
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class IC_Utility;
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class Debug_Address;
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class SCTableReference;
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// An ExternalReference represents a C++ address called from the generated
|
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|
// code. All references to C++ functions and must be encapsulated in an
|
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|
// ExternalReference instance. This is done in order to track the origin of
|
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|
|
// all external references in the code.
|
|
|
|
class ExternalReference BASE_EMBEDDED {
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|
public:
|
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|
|
explicit ExternalReference(Builtins::CFunctionId id);
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|
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explicit ExternalReference(Builtins::Name name);
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|
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explicit ExternalReference(Runtime::FunctionId id);
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|
|
explicit ExternalReference(Runtime::Function* f);
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|
|
explicit ExternalReference(const IC_Utility& ic_utility);
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|
|
explicit ExternalReference(const Debug_Address& debug_address);
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|
|
explicit ExternalReference(StatsCounter* counter);
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|
|
explicit ExternalReference(Top::AddressId id);
|
|
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|
|
explicit ExternalReference(const SCTableReference& table_ref);
|
|
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|
|
// 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 builtin_passed_function();
|
|
|
|
|
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|
|
// Static variable Factory::the_hole_value.location()
|
|
|
|
static ExternalReference the_hole_value_location();
|
|
|
|
|
|
|
|
// Static variable StackGuard::address_of_limit()
|
|
|
|
static ExternalReference address_of_stack_guard_limit();
|
|
|
|
|
|
|
|
// Function Debug::Break()
|
|
|
|
static ExternalReference debug_break();
|
|
|
|
|
|
|
|
// Static variable Heap::NewSpaceStart()
|
|
|
|
static ExternalReference new_space_start();
|
|
|
|
|
|
|
|
// Used for fast allocation in generated code.
|
|
|
|
static ExternalReference new_space_allocation_top_address();
|
|
|
|
static ExternalReference new_space_allocation_limit_address();
|
|
|
|
|
|
|
|
// Used to check if single stepping is enabled in generated code.
|
|
|
|
static ExternalReference debug_step_in_fp_address();
|
|
|
|
|
|
|
|
Address address() const {return address_;}
|
|
|
|
|
|
|
|
private:
|
|
|
|
explicit ExternalReference(void* address)
|
|
|
|
: address_(reinterpret_cast<Address>(address)) {}
|
|
|
|
|
|
|
|
Address address_;
|
|
|
|
};
|
|
|
|
|
|
|
|
|
|
|
|
// -----------------------------------------------------------------------------
|
|
|
|
// Utility functions
|
|
|
|
|
|
|
|
// Move these into inline file?
|
|
|
|
|
|
|
|
static inline bool is_intn(int x, int n) {
|
|
|
|
return -(1 << (n-1)) <= x && x < (1 << (n-1));
|
|
|
|
}
|
|
|
|
|
|
|
|
static inline bool is_int24(int x) { return is_intn(x, 24); }
|
|
|
|
static inline bool is_int8(int x) { return is_intn(x, 8); }
|
|
|
|
|
|
|
|
static inline bool is_uintn(int x, int n) {
|
|
|
|
return (x & -(1 << n)) == 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static inline bool is_uint3(int x) { return is_uintn(x, 3); }
|
|
|
|
static inline bool is_uint4(int x) { return is_uintn(x, 4); }
|
|
|
|
static inline bool is_uint5(int x) { return is_uintn(x, 5); }
|
|
|
|
static inline bool is_uint8(int x) { return is_uintn(x, 8); }
|
|
|
|
static inline bool is_uint12(int x) { return is_uintn(x, 12); }
|
|
|
|
static inline bool is_uint16(int x) { return is_uintn(x, 16); }
|
|
|
|
static inline bool is_uint24(int x) { return is_uintn(x, 24); }
|
|
|
|
|
|
|
|
} } // namespace v8::internal
|
|
|
|
|
|
|
|
#endif // V8_ASSEMBLER_H_
|