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Unified Diff: src/x64/lithium-x64.h

Issue 21042003: Patch to enhance the source code line information for profiler. (Closed) Base URL: http://v8.googlecode.com/svn/branches/bleeding_edge/
Patch Set: Created 7 years, 4 months ago
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Index: src/x64/lithium-x64.h
===================================================================
--- src/x64/lithium-x64.h (revision 16062)
+++ src/x64/lithium-x64.h (working copy)
@@ -206,9 +206,11 @@
class LInstruction: public ZoneObject {
public:
LInstruction()
- : environment_(NULL),
- hydrogen_value_(NULL),
- is_call_(false) { }
+ : environment_(NULL),
+ hydrogen_value_(NULL),
+ bit_field_(IsCallBits::encode(false)) {
+ set_position(RelocInfo::kNoPosition);
+ }
virtual ~LInstruction() { }
@@ -248,20 +250,30 @@
LPointerMap* pointer_map() const { return pointer_map_.get(); }
bool HasPointerMap() const { return pointer_map_.is_set(); }
+ // The 31 bits PositionBits is used to store the int position value. And the
+ // position value may be RelocInfo::kNoPosition (-1). The accessor always
+ // +1/-1 so that the encoded value of position in bit_field_ is always >= 0
+ // and can fit into the 31 bits PositionBits.
+ void set_position(int pos) {
+ bit_field_ = PositionBits::update(bit_field_, pos + 1);
+ }
+ int position() { return PositionBits::decode(bit_field_) - 1; }
+
void set_hydrogen_value(HValue* value) { hydrogen_value_ = value; }
HValue* hydrogen_value() const { return hydrogen_value_; }
- void MarkAsCall() { is_call_ = true; }
+ void MarkAsCall() { bit_field_ = IsCallBits::update(bit_field_, true); }
+ bool IsCall() const { return IsCallBits::decode(bit_field_); }
// Interface to the register allocator and iterators.
- bool ClobbersTemps() const { return is_call_; }
- bool ClobbersRegisters() const { return is_call_; }
- bool ClobbersDoubleRegisters() const { return is_call_; }
+ bool ClobbersTemps() const { return IsCall(); }
+ bool ClobbersRegisters() const { return IsCall(); }
+ bool ClobbersDoubleRegisters() const { return IsCall(); }
virtual void SetDeferredLazyDeoptimizationEnvironment(LEnvironment* env) { }
// Interface to the register allocator and iterators.
- bool IsMarkedAsCall() const { return is_call_; }
+ bool IsMarkedAsCall() const { return IsCall(); }
virtual bool HasResult() const = 0;
virtual LOperand* result() const = 0;
@@ -285,10 +297,13 @@
virtual int TempCount() = 0;
virtual LOperand* TempAt(int i) = 0;
+ class IsCallBits: public BitField<bool, 0, 1> {};
+ class PositionBits: public BitField<int, 1, 31> {};
+
LEnvironment* environment_;
SetOncePointer<LPointerMap> pointer_map_;
HValue* hydrogen_value_;
- bool is_call_;
+ int bit_field_;
};
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