Title: [204607] trunk/Source/_javascript_Core
- Revision
- 204607
- Author
- [email protected]
- Date
- 2016-08-18 13:25:30 -0700 (Thu, 18 Aug 2016)
Log Message
Add LLINT probe() macro for X86_64.
https://bugs.webkit.org/show_bug.cgi?id=160968
Reviewed by Geoffrey Garen.
* llint/LowLevelInterpreter.asm:
Modified Paths
Diff
Modified: trunk/Source/_javascript_Core/ChangeLog (204606 => 204607)
--- trunk/Source/_javascript_Core/ChangeLog 2016-08-18 19:55:41 UTC (rev 204606)
+++ trunk/Source/_javascript_Core/ChangeLog 2016-08-18 20:25:30 UTC (rev 204607)
@@ -1,5 +1,14 @@
2016-08-18 Mark Lam <[email protected]>
+ Add LLINT probe() macro for X86_64.
+ https://bugs.webkit.org/show_bug.cgi?id=160968
+
+ Reviewed by Geoffrey Garen.
+
+ * llint/LowLevelInterpreter.asm:
+
+2016-08-18 Mark Lam <[email protected]>
+
Remove unused SlotVisitor::append() variant.
https://bugs.webkit.org/show_bug.cgi?id=160961
Modified: trunk/Source/_javascript_Core/llint/LowLevelInterpreter.asm (204606 => 204607)
--- trunk/Source/_javascript_Core/llint/LowLevelInterpreter.asm 2016-08-18 19:55:41 UTC (rev 204606)
+++ trunk/Source/_javascript_Core/llint/LowLevelInterpreter.asm 2016-08-18 20:25:30 UTC (rev 204607)
@@ -437,6 +437,45 @@
end
end
+# The probe macro can be used to insert some debugging code without perturbing scalar
+# registers. Presently, the probe macro only preserves scalar registers. Hence, the
+# C probe callback function should not trash floating point registers.
+#
+# The macro you pass to probe() can pass whatever registers you like to your probe
+# callback function. However, you need to be mindful of which of the registers are
+# also used as argument registers, and ensure that you don't trash the register value
+# before storing it in the probe callback argument register that you desire.
+#
+# Here's an example of how it's used:
+#
+# probe(
+# macro()
+# move cfr, a0 # pass the ExecState* as arg0.
+# move t0, a1 # pass the value of register t0 as arg1.
+# call _cProbeCallbackFunction # to do whatever you want.
+# end
+# )
+#
+if X86_64
+ macro probe(action)
+ # save all the registers that the LLInt may use.
+ push a0, a1
+ push a2, a3
+ push t0, t1
+ push t2, t3
+ push t4, t5
+
+ action()
+
+ # restore all the registers we saved previously.
+ pop t5, t4
+ pop t3, t2
+ pop t1, t0
+ pop a3, a2
+ pop a1, a0
+ end
+end
+
macro checkStackPointerAlignment(tempReg, location)
if ARM64 or C_LOOP or SH4
# ARM64 will check for us!
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