Initial port of top-level code generator to ARM. For the constant...

src/arm/fast-codegen-arm.cc

+// Copyright 2009 the V8 project authors. All rights reserved.
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+//       notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+//       copyright notice, this list of conditions and the following
+//       disclaimer in the documentation and/or other materials provided
+//       with the distribution.
+//     * Neither the name of Google Inc. nor the names of its
+//       contributors may be used to endorse or promote products derived
+//       from this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#include "v8.h"
+
+#include "codegen-inl.h"
+#include "fast-codegen.h"
+
+namespace v8 {
+namespace internal {
+
+#define __ ACCESS_MASM(masm_)
+
+// Generate code for a JS function.  On entry to the function the receiver
+// and arguments have been pushed on the stack left to right.  The actual
+// argument count matches the formal parameter count expected by the
+// function.
+//
+// The live registers are:
+//   o r1: the JS function object being called (ie, ourselves)
+//   o cp: our context
+//   o fp: our caller's frame pointer
+//   o sp: stack pointer
+//   o lr: return address
+//
+// The function builds a JS frame.  Please see JavaScriptFrameConstants in
+// frames-arm.h for its layout.
+void FastCodeGenerator::Generate(FunctionLiteral* fun) {
+  function_ = fun;
+
+  __ stm(db_w, sp, r1.bit() | cp.bit() | fp.bit() | lr.bit());
+  // Adjust fp to point to caller's fp.
+  __ add(fp, sp, Operand(2 * kPointerSize));
+
+  { Comment cmnt(masm_, "[ Allocate locals");
+    int locals_count = fun->scope()->num_stack_slots();
+    if (locals_count > 0) {
+      __ LoadRoot(ip, Heap::kUndefinedValueRootIndex);
+    }
+    if (FLAG_check_stack) {
+      __ LoadRoot(r2, Heap::kStackLimitRootIndex);
+    }
+    for (int i = 0; i < locals_count; i++) {
+      __ push(ip);
+    }
+  }
+
+  if (FLAG_check_stack) {
+    // Put the lr setup instruction in the delay slot.  The kInstrSize is
+    // added to the implicit 8 byte offset that always applies to operations
+    // with pc and gives a return address 12 bytes down.
+    Comment cmnt(masm_, "[ Stack check");
+    __ add(lr, pc, Operand(Assembler::kInstrSize));
+    __ cmp(sp, Operand(r2));
+    StackCheckStub stub;
+    __ mov(pc,
+           Operand(reinterpret_cast<intptr_t>(stub.GetCode().location()),
+                   RelocInfo::CODE_TARGET),
+           LeaveCC,
+           lo);
+  }
+
+  { Comment cmnt(masm_, "[ Body");
+    VisitStatements(fun->body());
+  }
+
+  { Comment cmnt(masm_, "[ return <undefined>;");
+    // Emit a 'return undefined' in case control fell off the end of the
+    // body.
+    __ LoadRoot(r0, Heap::kUndefinedValueRootIndex);
+    __ RecordJSReturn();
+    __ mov(sp, fp);
+    __ ldm(ia_w, sp, fp.bit() | lr.bit());
+    int num_parameters = function_->scope()->num_parameters();
+    __ add(sp, sp, Operand((num_parameters + 1) * kPointerSize));
+    __ Jump(lr);
+  }
+}
+
+
+void FastCodeGenerator::VisitExpressionStatement(ExpressionStatement* stmt) {
+  Comment cmnt(masm_, "[ ExpressionStatement");
+  Visit(stmt->expression());
+  __ pop();
+}
+
+
+void FastCodeGenerator::VisitReturnStatement(ReturnStatement* stmt) {
+  Comment cmnt(masm_, "[ ReturnStatement");
+  Visit(stmt->expression());
+  __ pop(r0);
+  __ RecordJSReturn();
+  __ mov(sp, fp);
+  __ ldm(ia_w, sp, fp.bit() | lr.bit());
+    int num_parameters = function_->scope()->num_parameters();
+  __ add(sp, sp, Operand((num_parameters + 1) * kPointerSize));
+  __ Jump(lr);
+}
+
+
+void FastCodeGenerator::VisitSlot(Slot* expr) {
+  Comment cmnt(masm_, "[ Slot");
+  __ ldr(ip, MemOperand(fp, SlotOffset(expr)));
+  __ push(ip);
+}
+
+
+void FastCodeGenerator::VisitLiteral(Literal* expr) {
+  Comment cmnt(masm_, "[ Literal");
+  __ mov(ip, Operand(expr->handle()));
+  __ push(ip);
+}
+
+
+void FastCodeGenerator::VisitAssignment(Assignment* expr) {
+  Comment cmnt(masm_, "[ Assignment");
+  ASSERT(expr->op() == Token::ASSIGN || expr->op() == Token::INIT_VAR);
+
+  Visit(expr->value());
+
+  Variable* var = expr->target()->AsVariableProxy()->AsVariable();
+  ASSERT(var != NULL && var->slot() != NULL);
+  __ ldr(ip, MemOperand(sp));
+  __ str(ip, MemOperand(fp, SlotOffset(var->slot())));
+}
+
+
+} }  // namespace v8::internal