From: mvstanton@chromium.org <mvstanton@chromium.org@ce2b1a6d-e550-0410-aec6-3dcde31c8c00>
Date: Thu, 18 Apr 2013 15:44:38 +0000 (+0000)
Subject: HArgument instructions currently require a frame. In Lithium we can ensure a frame
X-Git-Tag: upstream/4.7.83~14521
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=bfb3e6ce9c52f52d1625a132c3f98befbdcdb9a6;p=platform%2Fupstream%2Fv8.git

HArgument instructions currently require a frame. In Lithium we can ensure a frame
is created for these instructions via a compile info flag.

BUG=

Review URL: https://codereview.chromium.org/14354003

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@14339 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
---

diff --git a/src/arm/lithium-arm.cc b/src/arm/lithium-arm.cc
index 64083e8..1314e78 100644
--- a/src/arm/lithium-arm.cc
+++ b/src/arm/lithium-arm.cc
@@ -989,12 +989,14 @@ LInstruction* LChunkBuilder::DoCompareMap(HCompareMap* instr) {
 
 
 LInstruction* LChunkBuilder::DoArgumentsLength(HArgumentsLength* instr) {
+  info()->MarkAsRequiresFrame();
   LOperand* value = UseRegister(instr->value());
   return DefineAsRegister(new(zone()) LArgumentsLength(value));
 }
 
 
 LInstruction* LChunkBuilder::DoArgumentsElements(HArgumentsElements* elems) {
+  info()->MarkAsRequiresFrame();
   return DefineAsRegister(new(zone()) LArgumentsElements);
 }
 
@@ -2456,6 +2458,7 @@ LInstruction* LChunkBuilder::DoArgumentsObject(HArgumentsObject* instr) {
 
 
 LInstruction* LChunkBuilder::DoAccessArgumentsAt(HAccessArgumentsAt* instr) {
+  info()->MarkAsRequiresFrame();
   LOperand* args = UseRegister(instr->arguments());
   LOperand* length = UseTempRegister(instr->length());
   LOperand* index = UseRegister(instr->index());
diff --git a/src/arm/lithium-codegen-arm.h b/src/arm/lithium-codegen-arm.h
index c55558c..5f720a9 100644
--- a/src/arm/lithium-codegen-arm.h
+++ b/src/arm/lithium-codegen-arm.h
@@ -83,7 +83,8 @@ class LCodeGen BASE_EMBEDDED {
   bool NeedsEagerFrame() const {
     return GetStackSlotCount() > 0 ||
         info()->is_non_deferred_calling() ||
-        !info()->IsStub();
+        !info()->IsStub() ||
+        info()->requires_frame();
   }
   bool NeedsDeferredFrame() const {
     return !NeedsEagerFrame() && info()->is_deferred_calling();
diff --git a/src/compiler.h b/src/compiler.h
index dae39db..00074c8 100644
--- a/src/compiler.h
+++ b/src/compiler.h
@@ -143,6 +143,14 @@ class CompilationInfo {
     return SavesCallerDoubles::decode(flags_);
   }
 
+  void MarkAsRequiresFrame() {
+    flags_ |= RequiresFrame::encode(true);
+  }
+
+  bool requires_frame() const {
+    return RequiresFrame::decode(flags_);
+  }
+
   void SetParseRestriction(ParseRestriction restriction) {
     flags_ = ParseRestricitonField::update(flags_, restriction);
   }
@@ -300,6 +308,8 @@ class CompilationInfo {
   class SavesCallerDoubles: public BitField<bool, 12, 1> {};
   // If the set of valid statements is restricted.
   class ParseRestricitonField: public BitField<ParseRestriction, 13, 1> {};
+  // If the function requires a frame (for unspecified reasons)
+  class RequiresFrame: public BitField<bool, 14, 1> {};
 
   unsigned flags_;
 
diff --git a/src/ia32/lithium-codegen-ia32.h b/src/ia32/lithium-codegen-ia32.h
index b268456..3e1bc35 100644
--- a/src/ia32/lithium-codegen-ia32.h
+++ b/src/ia32/lithium-codegen-ia32.h
@@ -87,7 +87,8 @@ class LCodeGen BASE_EMBEDDED {
   bool NeedsEagerFrame() const {
     return GetStackSlotCount() > 0 ||
         info()->is_non_deferred_calling() ||
-        !info()->IsStub();
+        !info()->IsStub() ||
+        info()->requires_frame();
   }
   bool NeedsDeferredFrame() const {
     return !NeedsEagerFrame() && info()->is_deferred_calling();
diff --git a/src/ia32/lithium-ia32.cc b/src/ia32/lithium-ia32.cc
index c4a8be1..523673a 100644
--- a/src/ia32/lithium-ia32.cc
+++ b/src/ia32/lithium-ia32.cc
@@ -1056,11 +1056,13 @@ LInstruction* LChunkBuilder::DoCompareMap(HCompareMap* instr) {
 
 
 LInstruction* LChunkBuilder::DoArgumentsLength(HArgumentsLength* length) {
+  info()->MarkAsRequiresFrame();
   return DefineAsRegister(new(zone()) LArgumentsLength(Use(length->value())));
 }
 
 
 LInstruction* LChunkBuilder::DoArgumentsElements(HArgumentsElements* elems) {
+  info()->MarkAsRequiresFrame();
   return DefineAsRegister(new(zone()) LArgumentsElements);
 }
 
@@ -2575,6 +2577,7 @@ LInstruction* LChunkBuilder::DoArgumentsObject(HArgumentsObject* instr) {
 
 
 LInstruction* LChunkBuilder::DoAccessArgumentsAt(HAccessArgumentsAt* instr) {
+  info()->MarkAsRequiresFrame();
   LOperand* args = UseRegister(instr->arguments());
   LOperand* length = UseTempRegister(instr->length());
   LOperand* index = Use(instr->index());
diff --git a/src/x64/lithium-codegen-x64.h b/src/x64/lithium-codegen-x64.h
index adcc3e5..3cad2cc 100644
--- a/src/x64/lithium-codegen-x64.h
+++ b/src/x64/lithium-codegen-x64.h
@@ -83,7 +83,8 @@ class LCodeGen BASE_EMBEDDED {
   bool NeedsEagerFrame() const {
     return GetStackSlotCount() > 0 ||
         info()->is_non_deferred_calling() ||
-        !info()->IsStub();
+        !info()->IsStub() ||
+        info()->requires_frame();
   }
   bool NeedsDeferredFrame() const {
     return !NeedsEagerFrame() && info()->is_deferred_calling();
diff --git a/src/x64/lithium-x64.cc b/src/x64/lithium-x64.cc
index 1d42455..d365174 100644
--- a/src/x64/lithium-x64.cc
+++ b/src/x64/lithium-x64.cc
@@ -997,11 +997,13 @@ LInstruction* LChunkBuilder::DoCompareMap(HCompareMap* instr) {
 
 
 LInstruction* LChunkBuilder::DoArgumentsLength(HArgumentsLength* length) {
+  info()->MarkAsRequiresFrame();
   return DefineAsRegister(new(zone()) LArgumentsLength(Use(length->value())));
 }
 
 
 LInstruction* LChunkBuilder::DoArgumentsElements(HArgumentsElements* elems) {
+  info()->MarkAsRequiresFrame();
   return DefineAsRegister(new(zone()) LArgumentsElements);
 }
 
@@ -2378,6 +2380,7 @@ LInstruction* LChunkBuilder::DoArgumentsObject(HArgumentsObject* instr) {
 
 
 LInstruction* LChunkBuilder::DoAccessArgumentsAt(HAccessArgumentsAt* instr) {
+  info()->MarkAsRequiresFrame();
   LOperand* args = UseRegister(instr->arguments());
   LOperand* length = UseTempRegister(instr->length());
   LOperand* index = Use(instr->index());