From 9f5c1bfba188cbb3b92bf514acb22f493f1339d9 Mon Sep 17 00:00:00 2001
From: "lrn@chromium.org"
 <lrn@chromium.org@ce2b1a6d-e550-0410-aec6-3dcde31c8c00>
Date: Fri, 14 Jan 2011 13:16:48 +0000
Subject: [PATCH] X64 Crnakshaft: Added GeneratePrologue implementation.

Review URL: http://codereview.chromium.org/6326003

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@6324 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
---
 src/ia32/lithium-codegen-ia32.cc | 11 ++++++++
 src/lithium-allocator.h          |  2 +-
 src/v8globals.h                  |  3 +-
 src/x64/lithium-codegen-x64.cc   | 48 ++++++++++++++++++++++++++++++--
 src/x64/lithium-x64.cc           | 16 +++++++----
 5 files changed, 71 insertions(+), 9 deletions(-)

diff --git a/src/ia32/lithium-codegen-ia32.cc b/src/ia32/lithium-codegen-ia32.cc
index 85efcc9907..7f9b5bd2cd 100644
--- a/src/ia32/lithium-codegen-ia32.cc
+++ b/src/ia32/lithium-codegen-ia32.cc
@@ -290,6 +290,17 @@ bool LCodeGen::GeneratePrologue() {
       __ j(not_zero, &loop);
     } else {
       __ sub(Operand(esp), Immediate(slots * kPointerSize));
+#ifdef _MSC_VER
+      // On windows, you may not access the stack more than one page below
+      // the most recently mapped page. To make the allocated area randomly
+      // accessible, we write to each page in turn (the value is irrelevant).
+      const int kPageSize = 4 * KB;
+      for (int offset = slots * kPointerSize - kPageSize;
+           offset > 0;
+           offset -= kPageSize) {
+        __ mov(Operand(esp, offset), eax);
+      }
+#endif
     }
   }
 
diff --git a/src/lithium-allocator.h b/src/lithium-allocator.h
index 3cb28a7be1..dfe1953df6 100644
--- a/src/lithium-allocator.h
+++ b/src/lithium-allocator.h
@@ -705,6 +705,7 @@ class LiveRange: public ZoneObject {
   bool HasAllocatedSpillOperand() const {
     return spill_operand_ != NULL && !spill_operand_->IsUnallocated();
   }
+
   LOperand* GetSpillOperand() const { return spill_operand_; }
   void SetSpillOperand(LOperand* operand) {
     ASSERT(!operand->IsUnallocated());
@@ -722,7 +723,6 @@ class LiveRange: public ZoneObject {
   bool Covers(LifetimePosition position);
   LifetimePosition FirstIntersection(LiveRange* other);
 
-
   // Add a new interval or a new use position to this live range.
   void EnsureInterval(LifetimePosition start, LifetimePosition end);
   void AddUseInterval(LifetimePosition start, LifetimePosition end);
diff --git a/src/v8globals.h b/src/v8globals.h
index 65bbf6ab24..3f27114bec 100644
--- a/src/v8globals.h
+++ b/src/v8globals.h
@@ -77,7 +77,8 @@ const Address kHandleZapValue =
     reinterpret_cast<Address>(V8_UINT64_C(0x1baddead0baddead));
 const Address kFromSpaceZapValue =
     reinterpret_cast<Address>(V8_UINT64_C(0x1beefdad0beefdad));
-const uint64_t kDebugZapValue = 0xbadbaddbbadbaddb;
+const uint64_t kDebugZapValue = V8_UINT64_C(0xbadbaddbbadbaddb);
+const uint64_t kSlotsZapValue = V8_UINT64_C(0xbeefdeadbeefdeed);
 #else
 const Address kZapValue = reinterpret_cast<Address>(0xdeadbeed);
 const Address kHandleZapValue = reinterpret_cast<Address>(0xbaddead);
diff --git a/src/x64/lithium-codegen-x64.cc b/src/x64/lithium-codegen-x64.cc
index ebc807d3f5..5763d4bbdb 100644
--- a/src/x64/lithium-codegen-x64.cc
+++ b/src/x64/lithium-codegen-x64.cc
@@ -242,8 +242,52 @@ void LCodeGen::Comment(const char* format, ...) {
 
 
 bool LCodeGen::GeneratePrologue() {
-  Abort("Unimplemented: %s", "GeneratePrologue");
-  return false;
+  ASSERT(is_generating());
+
+#ifdef DEBUG
+  if (strlen(FLAG_stop_at) > 0 &&
+      info_->function()->name()->IsEqualTo(CStrVector(FLAG_stop_at))) {
+    __ int3();
+  }
+#endif
+
+  __ push(rbp);  // Caller's frame pointer.
+  __ movq(rbp, rsp);
+  __ push(rsi);  // Callee's context.
+  __ push(rdi);  // Callee's JS function.
+
+  // Reserve space for the stack slots needed by the code.
+  int slots = StackSlotCount();
+  if (slots > 0) {
+    if (FLAG_debug_code) {
+      __ movl(rax, Immediate(slots));
+      __ movq(kScratchRegister, kSlotsZapValue, RelocInfo::NONE);
+      Label loop;
+      __ bind(&loop);
+      __ push(kScratchRegister);
+      __ decl(rax);
+      __ j(not_zero, &loop);
+    } else {
+      __ subq(rsp, Immediate(slots * kPointerSize));
+#ifdef _MSC_VER
+      // On windows, you may not access the stack more than one page below
+      // the most recently mapped page. To make the allocated area randomly
+      // accessible, we write to each page in turn (the value is irrelevant).
+      const int kPageSize = 4 * KB;
+      for (int offset = slots * kPointerSize - kPageSize;
+           offset > 0;
+           offset -= kPageSize) {
+        __ moveq(Operand(rsp, offset), rax);
+      }
+#endif
+    }
+  }
+
+  // Trace the call.
+  if (FLAG_trace) {
+    __ CallRuntime(Runtime::kTraceEnter, 0);
+  }
+  return !is_aborted();
 }
 
 
diff --git a/src/x64/lithium-x64.cc b/src/x64/lithium-x64.cc
index 4a7b3aa3ae..f13e690873 100644
--- a/src/x64/lithium-x64.cc
+++ b/src/x64/lithium-x64.cc
@@ -305,15 +305,20 @@ void LAccessArgumentsAt::PrintDataTo(StringStream* stream) {
 
 
 int LChunk::GetNextSpillIndex(bool is_double) {
-  // Need to consider what index means: Is it 32 bit or 64 bit index?
-  UNIMPLEMENTED();
-  return 0;
+  return spill_slot_count_++;
 }
 
 
 LOperand* LChunk::GetNextSpillSlot(bool is_double)  {
-  UNIMPLEMENTED();
-  return NULL;
+  // All stack slots are Double stack slots on x64.
+  // Alternatively, at some point, start using half-size
+  // stack slots for int32 values.
+  int index = GetNextSpillIndex(is_double);
+  if (is_double) {
+    return LDoubleStackSlot::Create(index);
+  } else {
+    return LStackSlot::Create(index);
+  }
 }
 
 
@@ -737,6 +742,7 @@ LInstruction* LChunkBuilder::DoArithmeticT(Token::Value op,
   return NULL;
 }
 
+
 void LChunkBuilder::DoBasicBlock(HBasicBlock* block, HBasicBlock* next_block) {
   ASSERT(is_building());
   current_block_ = block;