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Unified Diff: src/x64/deoptimizer-x64.cc

Issue 23526069: Refactor back edge table related code into a new class. (Closed) Base URL: https://v8.googlecode.com/svn/branches/bleeding_edge
Patch Set: Created 7 years, 3 months ago
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Index: src/x64/deoptimizer-x64.cc
diff --git a/src/x64/deoptimizer-x64.cc b/src/x64/deoptimizer-x64.cc
index 303b756cacdbd0ef3350e51a8831de4b68f0e45d..a5e4583aa24b1fe2a9d9c5b9083f239a37cfaa86 100644
--- a/src/x64/deoptimizer-x64.cc
+++ b/src/x64/deoptimizer-x64.cc
@@ -82,87 +82,6 @@ void Deoptimizer::PatchCodeForDeoptimization(Isolate* isolate, Code* code) {
}
-static const byte kJnsInstruction = 0x79;
-static const byte kJnsOffset = 0x1d;
-static const byte kCallInstruction = 0xe8;
-static const byte kNopByteOne = 0x66;
-static const byte kNopByteTwo = 0x90;
-
-// The back edge bookkeeping code matches the pattern:
-//
-// add <profiling_counter>, <-delta>
-// jns ok
-// call <stack guard>
-// ok:
-//
-// We will patch away the branch so the code is:
-//
-// add <profiling_counter>, <-delta> ;; Not changed
-// nop
-// nop
-// call <on-stack replacment>
-// ok:
-
-void Deoptimizer::PatchInterruptCodeAt(Code* unoptimized_code,
- Address pc_after,
- Code* replacement_code) {
- // Turn the jump into nops.
- Address call_target_address = pc_after - kIntSize;
- *(call_target_address - 3) = kNopByteOne;
- *(call_target_address - 2) = kNopByteTwo;
- // Replace the call address.
- Assembler::set_target_address_at(call_target_address,
- replacement_code->entry());
-
- unoptimized_code->GetHeap()->incremental_marking()->RecordCodeTargetPatch(
- unoptimized_code, call_target_address, replacement_code);
-}
-
-
-void Deoptimizer::RevertInterruptCodeAt(Code* unoptimized_code,
- Address pc_after,
- Code* interrupt_code) {
- // Restore the original jump.
- Address call_target_address = pc_after - kIntSize;
- *(call_target_address - 3) = kJnsInstruction;
- *(call_target_address - 2) = kJnsOffset;
- // Restore the original call address.
- Assembler::set_target_address_at(call_target_address,
- interrupt_code->entry());
-
- interrupt_code->GetHeap()->incremental_marking()->RecordCodeTargetPatch(
- unoptimized_code, call_target_address, interrupt_code);
-}
-
-
-#ifdef DEBUG
-Deoptimizer::InterruptPatchState Deoptimizer::GetInterruptPatchState(
- Isolate* isolate,
- Code* unoptimized_code,
- Address pc_after) {
- Address call_target_address = pc_after - kIntSize;
- ASSERT_EQ(kCallInstruction, *(call_target_address - 1));
- if (*(call_target_address - 3) == kNopByteOne) {
- ASSERT_EQ(kNopByteTwo, *(call_target_address - 2));
- Code* osr_builtin =
- isolate->builtins()->builtin(Builtins::kOnStackReplacement);
- ASSERT_EQ(osr_builtin->entry(),
- Assembler::target_address_at(call_target_address));
- return PATCHED_FOR_OSR;
- } else {
- // Get the interrupt stub code object to match against from cache.
- Code* interrupt_builtin =
- isolate->builtins()->builtin(Builtins::kInterruptCheck);
- ASSERT_EQ(interrupt_builtin->entry(),
- Assembler::target_address_at(call_target_address));
- ASSERT_EQ(kJnsInstruction, *(call_target_address - 3));
- ASSERT_EQ(kJnsOffset, *(call_target_address - 2));
- return NOT_PATCHED;
- }
-}
-#endif // DEBUG
-
-
void Deoptimizer::FillInputFrame(Address tos, JavaScriptFrame* frame) {
// Set the register values. The values are not important as there are no
// callee saved registers in JavaScript frames, so all registers are
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