Version 3.2.6

src/mips/regexp-macro-assembler-mips.cc

+// Copyright 2006-2010 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"
+
+#if defined(V8_TARGET_ARCH_MIPS)
+
+#include "unicode.h"
+#include "log.h"
+#include "code-stubs.h"
+#include "regexp-stack.h"
+#include "macro-assembler.h"
+#include "regexp-macro-assembler.h"
+#include "mips/regexp-macro-assembler-mips.h"
+
+namespace v8 {
+namespace internal {
+
+#ifndef V8_INTERPRETED_REGEXP
+/*
+ * This assembler uses the following register assignment convention
+ * - t1 : Pointer to current code object (Code*) including heap object tag.
+ * - t2 : Current position in input, as negative offset from end of string.
+ *        Please notice that this is the byte offset, not the character offset!
+ * - t3 : Currently loaded character. Must be loaded using
+ *        LoadCurrentCharacter before using any of the dispatch methods.
+ * - t4 : points to tip of backtrack stack
+ * - t5 : Unused.
+ * - t6 : End of input (points to byte after last character in input).
+ * - fp : Frame pointer. Used to access arguments, local variables and
+ *         RegExp registers.
+ * - sp : points to tip of C stack.
+ *
+ * The remaining registers are free for computations.
+ *
+ * Each call to a public method should retain this convention.
+ * The stack will have the following structure:
+ *       - direct_call        (if 1, direct call from JavaScript code, if 0 call
+ *                             through the runtime system)
+ *       - stack_area_base    (High end of the memory area to use as
+ *                             backtracking stack)
+ *       - int* capture_array (int[num_saved_registers_], for output).
+ *       - stack frame header (16 bytes in size)
+ *       --- sp when called ---
+ *       - link address
+ *       - backup of registers s0..s7
+ *       - end of input       (Address of end of string)
+ *       - start of input     (Address of first character in string)
+ *       - start index        (character index of start)
+ *       --- frame pointer ----
+ *       - void* input_string (location of a handle containing the string)
+ *       - Offset of location before start of input (effectively character
+ *         position -1). Used to initialize capture registers to a non-position.
+ *       - At start (if 1, we are starting at the start of the
+ *         string, otherwise 0)
+ *       - register 0         (Only positions must be stored in the first
+ *       - register 1          num_saved_registers_ registers)
+ *       - ...
+ *       - register num_registers-1
+ *       --- sp ---
+ *
+ * The first num_saved_registers_ registers are initialized to point to
+ * "character -1" in the string (i.e., char_size() bytes before the first
+ * character of the string). The remaining registers start out as garbage.
+ *
+ * The data up to the return address must be placed there by the calling
+ * code, by calling the code entry as cast to a function with the signature:
+ * int (*match)(String* input_string,
+ *              int start_index,
+ *              Address start,
+ *              Address end,
+ *              int* capture_output_array,
+ *              bool at_start,
+ *              byte* stack_area_base,
+ *              bool direct_call)
+ * The call is performed by NativeRegExpMacroAssembler::Execute()
+ * (in regexp-macro-assembler.cc).
+ */
+
+#define __ ACCESS_MASM(masm_)
+
+RegExpMacroAssemblerMIPS::RegExpMacroAssemblerMIPS(
+    Mode mode,
+    int registers_to_save)
+    : masm_(new MacroAssembler(NULL, kRegExpCodeSize)),
+      mode_(mode),
+      num_registers_(registers_to_save),
+      num_saved_registers_(registers_to_save),
+      entry_label_(),
+      start_label_(),
+      success_label_(),
+      backtrack_label_(),
+      exit_label_() {
+  ASSERT_EQ(0, registers_to_save % 2);
+  __ jmp(&entry_label_);   // We'll write the entry code later.
+  __ bind(&start_label_);  // And then continue from here.
+}
+
+
+RegExpMacroAssemblerMIPS::~RegExpMacroAssemblerMIPS() {
+  delete masm_;
+  // Unuse labels in case we throw away the assembler without calling GetCode.
+  entry_label_.Unuse();
+  start_label_.Unuse();
+  success_label_.Unuse();
+  backtrack_label_.Unuse();
+  exit_label_.Unuse();
+  check_preempt_label_.Unuse();
+  stack_overflow_label_.Unuse();
+}
+
+
+int RegExpMacroAssemblerMIPS::stack_limit_slack()  {
+  return RegExpStack::kStackLimitSlack;
+}
+
+
+void RegExpMacroAssemblerMIPS::AdvanceCurrentPosition(int by) {
+  UNIMPLEMENTED_MIPS();
+}
+
+
+void RegExpMacroAssemblerMIPS::AdvanceRegister(int reg, int by) {
+  UNIMPLEMENTED_MIPS();
+}
+
+
+void RegExpMacroAssemblerMIPS::Backtrack() {
+  UNIMPLEMENTED_MIPS();
+}
+
+
+void RegExpMacroAssemblerMIPS::Bind(Label* label) {
+  UNIMPLEMENTED_MIPS();
+}
+
+
+void RegExpMacroAssemblerMIPS::CheckCharacter(uint32_t c, Label* on_equal) {
+  UNIMPLEMENTED_MIPS();
+}
+
+
+void RegExpMacroAssemblerMIPS::CheckCharacterGT(uc16 limit, Label* on_greater) {
+  UNIMPLEMENTED_MIPS();
+}
+
+
+void RegExpMacroAssemblerMIPS::CheckAtStart(Label* on_at_start) {
+  UNIMPLEMENTED_MIPS();
+}
+
+
+void RegExpMacroAssemblerMIPS::CheckNotAtStart(Label* on_not_at_start) {
+  UNIMPLEMENTED_MIPS();
+}
+
+
+void RegExpMacroAssemblerMIPS::CheckCharacterLT(uc16 limit, Label* on_less) {
+  UNIMPLEMENTED_MIPS();
+}
+
+
+void RegExpMacroAssemblerMIPS::CheckCharacters(Vector<const uc16> str,
+                                              int cp_offset,
+                                              Label* on_failure,
+                                              bool check_end_of_string) {
+  UNIMPLEMENTED_MIPS();
+}
+
+
+void RegExpMacroAssemblerMIPS::CheckGreedyLoop(Label* on_equal) {
+  UNIMPLEMENTED_MIPS();
+}
+
+
+void RegExpMacroAssemblerMIPS::CheckNotBackReferenceIgnoreCase(
+    int start_reg,
+    Label* on_no_match) {
+  UNIMPLEMENTED_MIPS();
+}
+
+
+void RegExpMacroAssemblerMIPS::CheckNotBackReference(
+    int start_reg,
+    Label* on_no_match) {
+  UNIMPLEMENTED_MIPS();
+}
+
+
+void RegExpMacroAssemblerMIPS::CheckNotRegistersEqual(int reg1,
+                                                      int reg2,
+                                                      Label* on_not_equal) {
+  UNIMPLEMENTED_MIPS();
+}
+
+
+void RegExpMacroAssemblerMIPS::CheckNotCharacter(uint32_t c,
+                                                Label* on_not_equal) {
+  UNIMPLEMENTED_MIPS();
+}
+
+
+void RegExpMacroAssemblerMIPS::CheckCharacterAfterAnd(uint32_t c,
+                                                     uint32_t mask,
+                                                     Label* on_equal) {
+  UNIMPLEMENTED_MIPS();
+}
+
+
+void RegExpMacroAssemblerMIPS::CheckNotCharacterAfterAnd(uint32_t c,
+                                                        uint32_t mask,
+                                                        Label* on_not_equal) {
+  UNIMPLEMENTED_MIPS();
+}
+
+
+void RegExpMacroAssemblerMIPS::CheckNotCharacterAfterMinusAnd(
+    uc16 c,
+    uc16 minus,
+    uc16 mask,
+    Label* on_not_equal) {
+  UNIMPLEMENTED_MIPS();
+}
+
+
+bool RegExpMacroAssemblerMIPS::CheckSpecialCharacterClass(uc16 type,
+                                                         Label* on_no_match) {
+  UNIMPLEMENTED_MIPS();
+  return false;
+}
+
+
+void RegExpMacroAssemblerMIPS::Fail() {
+  UNIMPLEMENTED_MIPS();
+}
+
+
+Handle<Object> RegExpMacroAssemblerMIPS::GetCode(Handle<String> source) {
+  UNIMPLEMENTED_MIPS();
+  return Handle<Object>::null();
+}
+
+
+void RegExpMacroAssemblerMIPS::GoTo(Label* to) {
+  UNIMPLEMENTED_MIPS();
+}
+
+
+void RegExpMacroAssemblerMIPS::IfRegisterGE(int reg,
+                                           int comparand,
+                                           Label* if_ge) {
+  __ lw(a0, register_location(reg));
+    BranchOrBacktrack(if_ge, ge, a0, Operand(comparand));
+}
+
+
+void RegExpMacroAssemblerMIPS::IfRegisterLT(int reg,
+                                           int comparand,
+                                           Label* if_lt) {
+  UNIMPLEMENTED_MIPS();
+}
+
+
+void RegExpMacroAssemblerMIPS::IfRegisterEqPos(int reg,
+                                              Label* if_eq) {
+  UNIMPLEMENTED_MIPS();
+}
+
+
+RegExpMacroAssembler::IrregexpImplementation
+    RegExpMacroAssemblerMIPS::Implementation() {
+  return kMIPSImplementation;
+}
+
+
+void RegExpMacroAssemblerMIPS::LoadCurrentCharacter(int cp_offset,
+                                                   Label* on_end_of_input,
+                                                   bool check_bounds,
+                                                   int characters) {
+  UNIMPLEMENTED_MIPS();
+}
+
+
+void RegExpMacroAssemblerMIPS::PopCurrentPosition() {
+  UNIMPLEMENTED_MIPS();
+}
+
+
+void RegExpMacroAssemblerMIPS::PopRegister(int register_index) {
+  UNIMPLEMENTED_MIPS();
+}
+
+
+
+void RegExpMacroAssemblerMIPS::PushBacktrack(Label* label) {
+  UNIMPLEMENTED_MIPS();
+}
+
+
+void RegExpMacroAssemblerMIPS::PushCurrentPosition() {
+  Push(current_input_offset());
+}
+
+
+void RegExpMacroAssemblerMIPS::PushRegister(int register_index,
+                                           StackCheckFlag check_stack_limit) {
+  UNIMPLEMENTED_MIPS();
+}
+
+
+void RegExpMacroAssemblerMIPS::ReadCurrentPositionFromRegister(int reg) {
+  UNIMPLEMENTED_MIPS();
+}
+
+
+void RegExpMacroAssemblerMIPS::ReadStackPointerFromRegister(int reg) {
+  UNIMPLEMENTED_MIPS();
+}
+
+
+void RegExpMacroAssemblerMIPS::SetCurrentPositionFromEnd(int by) {
+  UNIMPLEMENTED_MIPS();
+}
+
+
+void RegExpMacroAssemblerMIPS::SetRegister(int register_index, int to) {
+  UNIMPLEMENTED_MIPS();
+}
+
+
+void RegExpMacroAssemblerMIPS::Succeed() {
+  UNIMPLEMENTED_MIPS();
+}
+
+
+void RegExpMacroAssemblerMIPS::WriteCurrentPositionToRegister(int reg,
+                                                             int cp_offset) {
+  UNIMPLEMENTED_MIPS();
+}
+
+
+void RegExpMacroAssemblerMIPS::ClearRegisters(int reg_from, int reg_to) {
+  UNIMPLEMENTED_MIPS();
+}
+
+
+void RegExpMacroAssemblerMIPS::WriteStackPointerToRegister(int reg) {
+  UNIMPLEMENTED_MIPS();
+}
+
+
+// Private methods:
+
+void RegExpMacroAssemblerMIPS::CallCheckStackGuardState(Register scratch) {
+  UNIMPLEMENTED_MIPS();
+}
+
+
+// Helper function for reading a value out of a stack frame.
+template <typename T>
+static T& frame_entry(Address re_frame, int frame_offset) {
+  return reinterpret_cast<T&>(Memory::int32_at(re_frame + frame_offset));
+}
+
+
+int RegExpMacroAssemblerMIPS::CheckStackGuardState(Address* return_address,
+                                                  Code* re_code,
+                                                  Address re_frame) {
+  UNIMPLEMENTED_MIPS();
+  return 0;
+}
+
+
+MemOperand RegExpMacroAssemblerMIPS::register_location(int register_index) {
+  UNIMPLEMENTED_MIPS();
+  return MemOperand(zero_reg, 0);
+}
+
+
+void RegExpMacroAssemblerMIPS::CheckPosition(int cp_offset,
+                                            Label* on_outside_input) {
+  UNIMPLEMENTED_MIPS();
+}
+
+
+void RegExpMacroAssemblerMIPS::BranchOrBacktrack(Label* to,
+                                                 Condition condition,
+                                                 Register rs,
+                                                 const Operand& rt) {
+  UNIMPLEMENTED_MIPS();
+}
+
+
+void RegExpMacroAssemblerMIPS::SafeCall(Label* to, Condition cond, Register rs,
+                                           const Operand& rt) {
+  UNIMPLEMENTED_MIPS();
+}
+
+
+void RegExpMacroAssemblerMIPS::SafeReturn() {
+  UNIMPLEMENTED_MIPS();
+}
+
+
+void RegExpMacroAssemblerMIPS::SafeCallTarget(Label* name) {
+  UNIMPLEMENTED_MIPS();
+}
+
+
+void RegExpMacroAssemblerMIPS::Push(Register source) {
+  UNIMPLEMENTED_MIPS();
+}
+
+
+void RegExpMacroAssemblerMIPS::Pop(Register target) {
+  UNIMPLEMENTED_MIPS();
+}
+
+
+void RegExpMacroAssemblerMIPS::CheckPreemption() {
+  UNIMPLEMENTED_MIPS();
+}
+
+
+void RegExpMacroAssemblerMIPS::CheckStackLimit() {
+  UNIMPLEMENTED_MIPS();
+}
+
+
+void RegExpMacroAssemblerMIPS::CallCFunctionUsingStub(
+    ExternalReference function,
+    int num_arguments) {
+  UNIMPLEMENTED_MIPS();
+}
+
+
+void RegExpMacroAssemblerMIPS::LoadCurrentCharacterUnchecked(int cp_offset,
+                                                             int characters) {
+  UNIMPLEMENTED_MIPS();
+}
+
+
+void RegExpCEntryStub::Generate(MacroAssembler* masm_) {
+  UNIMPLEMENTED_MIPS();
+}
+
+
+#undef __
+
+#endif  // V8_INTERPRETED_REGEXP
+
+}}  // namespace v8::internal
+
+#endif  // V8_TARGET_ARCH_MIPS