Rebase #45 "Pacify Valgrind (by fixing a somewhat theoretical bug)."

Co-authored-by: argosphil <[email protected]>

Author: Ben Grant

Source/JavaScriptCore/llint/InPlaceInterpreter.asm

@@ -590,12 +590,8 @@ end
     addp t1, t0
     mulp StackValueSize, t0
     addp IPIntCalleeSaveSpaceStackAligned, t0
-if ARMv7
-    move cfr, sp
-    subp sp, t0, sp
-else
-    subp cfr, t0, sp
-end
+    subp cfr, t0, t0
+    move t0, sp
 
 if X86_64
     loadp UnboxedWasmCalleeStackSlot[cfr], ws0

Source/JavaScriptCore/llint/LowLevelInterpreter.asm

@@ -1076,7 +1076,8 @@ macro restoreStackPointerAfterCall()
         subp cfr, t2, t2
         move t2, sp
     else
-        subp cfr, t2, sp
+        subp cfr, t2, t2
+        move t2, sp
     end
 end
 

Source/JavaScriptCore/llint/LowLevelInterpreter32_64.asm

@@ -320,7 +320,8 @@ macro doVMEntry(makeCall)
         subp cfr, CalleeRegisterSaveSize, t5
         move t5, sp
     else
-        subp cfr, CalleeRegisterSaveSize, sp
+        subp cfr, CalleeRegisterSaveSize, t5
+        move t5, sp
     end
 
     popCalleeSaves()
@@ -359,7 +360,8 @@ _llint_throw_stack_overflow_error_from_vm_entry:
         subp cfr, CalleeRegisterSaveSize, t5
         move t5, sp
     else
-        subp cfr, CalleeRegisterSaveSize, sp
+        subp cfr, CalleeRegisterSaveSize, t5
+        move t5, sp
     end
 
     popCalleeSaves()
@@ -426,7 +428,8 @@ op(llint_handle_uncaught_exception, macro()
         subp cfr, CalleeRegisterSaveSize, t3
         move t3, sp
     else
-        subp cfr, CalleeRegisterSaveSize, sp
+        subp cfr, CalleeRegisterSaveSize, t3
+        move t3, sp
     end
 
     popCalleeSaves()

Source/JavaScriptCore/llint/LowLevelInterpreter64.asm

@@ -303,7 +303,8 @@ macro doVMEntry(makeCall)
         storep t2, VM::topEntryFrame[vm]
     end
 
-    subp cfr, CalleeRegisterSaveSize, sp
+    subp cfr, CalleeRegisterSaveSize, t2
+    move t2, sp
 
     popCalleeSaves()
     functionEpilogue()
@@ -329,7 +330,8 @@ _llint_throw_stack_overflow_error_from_vm_entry:
 
     move ValueUndefined, r0
 
-    subp cfr, CalleeRegisterSaveSize, sp
+    subp cfr, CalleeRegisterSaveSize, t4
+    move t4, sp
     popCalleeSaves()
     functionEpilogue()
     ret
@@ -387,7 +389,8 @@ op(llint_handle_uncaught_exception, macro ()
 
     move ValueUndefined, r0
 
-    subp cfr, CalleeRegisterSaveSize, sp
+    subp cfr, CalleeRegisterSaveSize, t3
+    move t3, sp
     popCalleeSaves()
     functionEpilogue()
     ret

Source/JavaScriptCore/llint/WebAssembly.asm

@@ -349,7 +349,8 @@ if ARMv7
     subp cfr, ws1, ws1
     move ws1, sp
 else
-    subp cfr, ws1, sp
+    subp cfr, ws1, ws1
+    move ws1, sp
 end
 end