8250914: Matcher::stack_direction() is unused

Remove unused Matcher::stack_direction() together with related ADL entries and
ADLC support.

Reviewed-by: vlivanov, thartmann

Author: robcasloz

src/hotspot/cpu/aarch64/aarch64.ad

@@ -4043,9 +4043,6 @@ encode %{
 //         SP meets the minimum alignment.
 
 frame %{
-  // What direction does stack grow in (assumed to be same for C & Java)
-  stack_direction(TOWARDS_LOW);
-
   // These three registers define part of the calling convention
   // between compiled code and the interpreter.
 

src/hotspot/cpu/arm/arm.ad

@@ -1664,9 +1664,6 @@ encode %{
 //         the region from SP to FP meets the minimum stack alignment.
 
 frame %{
-  // What direction does stack grow in (assumed to be same for native & Java)
-  stack_direction(TOWARDS_LOW);
-
   // These two registers define part of the calling convention
   // between compiled code and the interpreter.
   inline_cache_reg(R_Ricklass);          // Inline Cache Register or Method* for I2C

src/hotspot/cpu/ppc/ppc.ad

@@ -4118,9 +4118,6 @@ encode %{
 // Definition of frame structure and management information.
 
 frame %{
-  // What direction does stack grow in (assumed to be same for native & Java).
-  stack_direction(TOWARDS_LOW);
-
   // These two registers define part of the calling convention between
   // compiled code and the interpreter.
 

src/hotspot/cpu/s390/s390.ad

@@ -2456,9 +2456,6 @@ source %{
 // Definition of frame structure and management information.
 
 frame %{
-  // What direction does stack grow in (assumed to be same for native & Java).
-  stack_direction(TOWARDS_LOW);
-
   // These two registers define part of the calling convention between
   // compiled code and the interpreter.
 

src/hotspot/cpu/x86/x86_32.ad

@@ -3191,9 +3191,6 @@ encode %{
 //         the region from SP to FP meets the minimum stack alignment.
 
 frame %{
-  // What direction does stack grow in (assumed to be same for C & Java)
-  stack_direction(TOWARDS_LOW);
-
   // These three registers define part of the calling convention
   // between compiled code and the interpreter.
   inline_cache_reg(EAX);                // Inline Cache Register

src/hotspot/cpu/x86/x86_64.ad

@@ -2740,9 +2740,6 @@ encode %{
 
 frame
 %{
-  // What direction does stack grow in (assumed to be same for C & Java)
-  stack_direction(TOWARDS_LOW);
-
   // These three registers define part of the calling convention
   // between compiled code and the interpreter.
   inline_cache_reg(RAX);                // Inline Cache Register

src/hotspot/share/adlc/adlparse.cpp

@@ -985,9 +985,6 @@ void ADLParser::frame_parse(void) {
             parse_err(SYNERR, "missing identifier inside frame block.\n");
             return;
       }
-      if (strcmp(token,"stack_direction")==0) {
-        stack_dir_parse(frame);
-      }
       if (strcmp(token,"sync_stack_slots")==0) {
         sync_stack_slots_parse(frame);
       }
@@ -1109,21 +1106,6 @@ void ADLParser::frame_parse(void) {
   // skipws();
 }
 
-//------------------------------stack_dir_parse--------------------------------
-void ADLParser::stack_dir_parse(FrameForm *frame) {
-  char *direction = parse_one_arg("stack direction entry");
-  if (strcmp(direction, "TOWARDS_LOW") == 0) {
-    frame->_direction = false;
-  }
-  else if (strcmp(direction, "TOWARDS_HIGH") == 0) {
-    frame->_direction = true;
-  }
-  else {
-    parse_err(SYNERR, "invalid value inside stack direction entry.\n");
-    return;
-  }
-}
-
 //------------------------------sync_stack_slots_parse-------------------------
 void ADLParser::sync_stack_slots_parse(FrameForm *frame) {
     // Assign value into frame form

src/hotspot/share/adlc/adlparse.hpp

@@ -110,7 +110,6 @@ class ADLParser {
   void enc_class_parse_block(EncClass* encoding, char* ec_name);
 
   // Parse the components of the frame section
-  void stack_dir_parse(FrameForm *frame);   // Parse the stack direction entry
   void sync_stack_slots_parse(FrameForm *frame);
   void frame_pointer_parse(FrameForm *frame, bool native);
   void interpreter_frame_pointer_parse(FrameForm *frame, bool native);

src/hotspot/share/adlc/formsopt.hpp

@@ -334,7 +334,6 @@ class FrameForm : public Form {
 
 public:
   // Public Data
-  bool  _direction;                // Direction of stack growth
   char *_sync_stack_slots;
   char *_inline_cache_reg;
   char *_interpreter_method_oop_reg;

src/hotspot/share/adlc/output_c.cpp

@@ -4143,9 +4143,6 @@ void ArchDesc::buildInstructMatchCheck(FILE *fp_cpp) const {
 // Output the methods to Matcher which specify frame behavior
 void ArchDesc::buildFrameMethods(FILE *fp_cpp) {
   fprintf(fp_cpp,"\n\n");
-  // Stack Direction
-  fprintf(fp_cpp,"bool Matcher::stack_direction() const { return %s; }\n\n",
-          _frame->_direction ? "true" : "false");
   // Sync Stack Slots
   fprintf(fp_cpp,"int Compile::sync_stack_slots() const { return %s; }\n\n",
           _frame->_sync_stack_slots);