Index: runtime/vm/assembler_x64.h |
=================================================================== |
--- runtime/vm/assembler_x64.h (revision 19430) |
+++ runtime/vm/assembler_x64.h (working copy) |
@@ -701,6 +701,58 @@ |
buffer_.FinalizeInstructions(region); |
} |
+ // Set up a Dart frame on entry with a frame pointer and PC information to |
+ // enable easy access to the RawInstruction object of code corresponding |
+ // to this frame. |
+ // The dart frame layout is as follows: |
+ // .... |
+ // ret PC |
+ // saved RBP <=== RBP |
+ // pc (used to derive the RawInstruction Object of the dart code) |
+ // locals space <=== RSP |
+ // ..... |
+ // This code sets this up with the sequence: |
+ // pushq rbp |
+ // movq rbp, rsp |
+ // call L |
+ // L: <code to adjust saved pc if there is any intrinsification code> |
+ // ..... |
+ void EnterDartFrame(intptr_t frame_size); |
+ |
+ // Set up a stub frame so that the stack traversal code can easily identify |
+ // a stub frame. |
+ // The stub frame layout is as follows: |
+ // .... |
+ // ret PC |
+ // saved RBP |
+ // pc (used to derive the RawInstruction Object of the stub) |
+ // ..... |
+ // This code sets this up with the sequence: |
+ // pushq rbp |
+ // movq rbp, rsp |
+ // pushq immediate(0) |
+ // ..... |
+ void EnterStubFrame(); |
+ |
+ // Instruction pattern from entrypoint is used in dart frame prologs |
+ // to set up the frame and save a PC which can be used to figure out the |
+ // RawInstruction object corresponding to the code running in the frame. |
+ // entrypoint: |
+ // pushq rbp (size is 1 byte) |
+ // movq rbp, rsp (size is 3 bytes) |
+ // call L (size is 5 bytes) |
+ // L: |
+ static const intptr_t kOffsetOfSavedPCfromEntrypoint = 9; |
+ |
+ // Inlined allocation of an instance of class 'cls', code has no runtime |
+ // calls. Jump to 'failure' if the instance cannot be allocated here. |
+ // Allocated instance is returned in 'instance_reg'. |
+ // Only the tags field of the object is initialized. |
+ void TryAllocate(const Class& cls, |
+ Label* failure, |
+ bool near_jump, |
+ Register instance_reg); |
+ |
// Debugging and bringup support. |
void Stop(const char* message); |
void Unimplemented(const char* message); |