From d52e6f76494c5ce74e27e7b6da270e05cc132e36 Mon Sep 17 00:00:00 2001
From: "karlklose@chromium.org"
 <karlklose@chromium.org@ce2b1a6d-e550-0410-aec6-3dcde31c8c00>
Date: Sun, 13 Feb 2011 18:39:14 +0000
Subject: [PATCH] Revert r6759.

TBR=sgjesse@chromium.org
Review URL: http://codereview.chromium.org/6484025

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@6761 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
---
 src/arm/deoptimizer-arm.cc | 52 ++--------------------------------------------
 1 file changed, 2 insertions(+), 50 deletions(-)

diff --git a/src/arm/deoptimizer-arm.cc b/src/arm/deoptimizer-arm.cc
index c0884cf..caec55a 100644
--- a/src/arm/deoptimizer-arm.cc
+++ b/src/arm/deoptimizer-arm.cc
@@ -124,62 +124,14 @@ void Deoptimizer::DeoptimizeFunction(JSFunction* function) {
 void Deoptimizer::PatchStackCheckCodeAt(Address pc_after,
                                         Code* check_code,
                                         Code* replacement_code) {
-  const int kInstrSize = Assembler::kInstrSize;
-  // The call of the stack guard check has the following form:
-  //  e1 5d 00 0c       cmp sp, <limit>
-  //  2a 00 00 01       bcs ok
-  //  e5 9f c? ??       ldr ip, [pc, <stack guard address>]
-  //  e1 2f ff 3c       blx ip
-  ASSERT(Memory::int32_at(pc_after - kInstrSize) ==
-      (al | B24 | B21 | 15*B16 | 15*B12 | 15*B8 | BLX | ip.code()));
-  ASSERT(Assembler::IsLdrPcImmediateOffset(
-      Assembler::instr_at(pc_after - 2 * kInstrSize)));
-
-  // We patch the code to the following form:
-  //  e1 5d 00 0c       cmp sp, <limit>
-  //  e1 a0 00 00       mov r0, r0 (NOP)
-  //  e5 9f c? ??       ldr ip, [pc, <on-stack replacement address>]
-  //  e1 2f ff 3c       blx ip
-  // and overwrite the constant containing the
-  // address of the stack check stub.
-
-  // Replace conditional jump with NOP.
-  CodePatcher patcher(pc_after - 3 * kInstrSize, 1);
-  patcher.masm()->nop();
-
-  // Replace the stack check address in the constant pool
-  // with the entry address of the replacement code.
-  uint32_t stack_check_address_offset = Memory::uint16_at(pc_after -
-      2 * kInstrSize) & 0xfff;
-  Address stack_check_address_pointer = pc_after + stack_check_address_offset;
-  ASSERT(Memory::uint32_at(stack_check_address_pointer) ==
-         reinterpret_cast<uint32_t>(check_code->entry()));
-  Memory::uint32_at(stack_check_address_pointer) =
-      reinterpret_cast<uint32_t>(replacement_code->entry());
+  UNIMPLEMENTED();
 }
 
 
 void Deoptimizer::RevertStackCheckCodeAt(Address pc_after,
                                          Code* check_code,
                                          Code* replacement_code) {
-  const int kInstrSize = Assembler::kInstrSize;
-  ASSERT(Memory::uint32_at(pc_after - kInstrSize) == 0xe12fff3c);
-  ASSERT(Memory::uint8_at(pc_after - kInstrSize - 1) == 0xe5);
-  ASSERT(Memory::uint8_at(pc_after - kInstrSize - 2) == 0x9f);
-
-  // Replace NOP wi th conditional jump.
-  CodePatcher patcher(pc_after - 3 * kInstrSize, 1);
-  patcher.masm()->b(+4, cs);
-
-  // Replace the stack check address in the constant pool
-  // with the entry address of the replacement code.
-  uint32_t stack_check_address_offset = Memory::uint16_at(pc_after -
-      2 * kInstrSize) & 0xfff;
-  Address stack_check_address_pointer = pc_after + stack_check_address_offset;
-  ASSERT(Memory::uint32_at(stack_check_address_pointer) ==
-         reinterpret_cast<uint32_t>(replacement_code->entry()));
-  Memory::uint32_at(stack_check_address_pointer) =
-      reinterpret_cast<uint32_t>(check_code->entry());
+  UNIMPLEMENTED();
 }
 
 
-- 
2.7.4