Revision: 21937
Author: [email protected]
Date: Mon Jun 23 13:20:26 2014 UTC
Log: Support LiveEdit on Arm64
BUG=368580
LOG=Y
[email protected]
Review URL: https://codereview.chromium.org/339663007
http://code.google.com/p/v8/source/detail?r=21937
Modified:
/branches/bleeding_edge/src/arm64/debug-arm64.cc
/branches/bleeding_edge/src/objects.h
/branches/bleeding_edge/test/mjsunit/mjsunit.status
=======================================
--- /branches/bleeding_edge/src/arm64/debug-arm64.cc Mon Jun 9 14:23:46
2014 UTC
+++ /branches/bleeding_edge/src/arm64/debug-arm64.cc Mon Jun 23 13:20:26
2014 UTC
@@ -131,6 +131,14 @@
{
FrameScope scope(masm, StackFrame::INTERNAL);
+ // Load padding words on stack.
+ __ ldr(scratch, Smi::FromInt(LiveEdit::kFramePaddingValue));
+ for (int i = 0; i < LiveEdit::kFramePaddingInitialSize; i++) {
+ __ push(scratch);
+ }
+ __ ldr(scratch, Smi::FromInt(LiveEdit::kFramePaddingInitialSize));
+ __ push(scratch);
+
// Any live values (object_regs and non_object_regs) in caller-saved
// registers (or lr) need to be stored on the stack so that their
values are
// safely preserved for a call into C code.
@@ -199,6 +207,9 @@
__ Pop(scratch, reg);
__ Bfxil(reg, scratch, 32, 32);
}
+
+ // Don't bother removing padding bytes pushed on the stack
+ // as the frame is going to be restored right away.
// Leave the internal frame.
}
@@ -341,16 +352,37 @@
void DebugCodegen::GeneratePlainReturnLiveEdit(MacroAssembler* masm) {
- masm->Abort(kLiveEditFrameDroppingIsNotSupportedOnARM64);
+ __ Ret();
}
void DebugCodegen::GenerateFrameDropperLiveEdit(MacroAssembler* masm) {
- masm->Abort(kLiveEditFrameDroppingIsNotSupportedOnARM64);
+ ExternalReference restarter_frame_function_slot =
+ ExternalReference::debug_restarter_frame_function_pointer_address(
+ masm->isolate());
+ __ mov(x1, xzr);
+ __ Mov(ip0, restarter_frame_function_slot);
+ __ str(x1, MemOperand(ip0, 0));
+
+ // We do not know our frame height, but set sp based on fp.
+ __ sub(jssp, fp, Operand(kPointerSize));
+
+ __ Pop(x1, fp, lr); // Function, Frame, Return address.
+
+ // Load context from the function.
+ __ ldr(cp, FieldMemOperand(x1, JSFunction::kContextOffset));
+
+ // Get function code.
+ __ ldr(ip0, FieldMemOperand(x1, JSFunction::kSharedFunctionInfoOffset));
+ __ ldr(ip0, FieldMemOperand(ip0, SharedFunctionInfo::kCodeOffset));
+ __ add(ip0, ip0, Operand(Code::kHeaderSize - kHeapObjectTag));
+
+ // Re-run JSFunction, x1 is function, cp is context.
+ __ Jump(ip0);
}
-const bool LiveEdit::kFrameDropperSupported = false;
+const bool LiveEdit::kFrameDropperSupported = true;
} } // namespace v8::internal
=======================================
--- /branches/bleeding_edge/src/objects.h Mon Jun 23 11:27:24 2014 UTC
+++ /branches/bleeding_edge/src/objects.h Mon Jun 23 13:20:26 2014 UTC
@@ -1157,8 +1157,6 @@
V(kLetBindingReInitialization, "Let binding
re-initialization") \
V(kLhsHasBeenClobbered, "lhs has been
clobbered") \
V(kLiveBytesCountOverflowChunkSize, "Live Bytes Count overflow chunk
size") \
-
V(kLiveEditFrameDroppingIsNotSupportedOnARM64,
\
- "LiveEdit frame dropping is not supported on
arm64") \
V(kLiveEdit, "LiveEdit")
\
V(kLookupVariableInCountOperation,
\
"Lookup variable in count
operation") \
=======================================
--- /branches/bleeding_edge/test/mjsunit/mjsunit.status Fri Jun 20 20:52:57
2014 UTC
+++ /branches/bleeding_edge/test/mjsunit/mjsunit.status Mon Jun 23 13:20:26
2014 UTC
@@ -204,13 +204,6 @@
'regress/regress-2185-2': [PASS, TIMEOUT],
'whitespaces': [PASS, TIMEOUT, SLOW],
- # Stack manipulations in LiveEdit is not implemented for this arch.
- 'debug-liveedit-check-stack': [SKIP],
- 'debug-liveedit-stack-padding': [SKIP],
- 'debug-liveedit-restart-frame': [SKIP],
- 'debug-liveedit-double-call': [SKIP],
- 'harmony/generators-debug-liveedit': [SKIP],
-
# BUG(v8:3147). It works on other architectures by accident.
'regress/regress-conditional-position': [FAIL],
--
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