Upgrade V8 to version 4.9.385.28
https://chromium.googlesource.com/v8/v8/+/4.9.385.28
FPIIM-449
Change-Id: I4b2e74289d4bf3667f2f3dc8aa2e541f63e26eb4
diff --git a/src/regexp/ppc/regexp-macro-assembler-ppc.cc b/src/regexp/ppc/regexp-macro-assembler-ppc.cc
new file mode 100644
index 0000000..f3ddf7b
--- /dev/null
+++ b/src/regexp/ppc/regexp-macro-assembler-ppc.cc
@@ -0,0 +1,1298 @@
+// Copyright 2014 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#if V8_TARGET_ARCH_PPC
+
+#include "src/regexp/ppc/regexp-macro-assembler-ppc.h"
+
+#include "src/base/bits.h"
+#include "src/code-stubs.h"
+#include "src/log.h"
+#include "src/macro-assembler.h"
+#include "src/profiler/cpu-profiler.h"
+#include "src/regexp/regexp-macro-assembler.h"
+#include "src/regexp/regexp-stack.h"
+#include "src/unicode.h"
+
+namespace v8 {
+namespace internal {
+
+#ifndef V8_INTERPRETED_REGEXP
+/*
+ * This assembler uses the following register assignment convention
+ * - r25: Temporarily stores the index of capture start after a matching pass
+ * for a global regexp.
+ * - r26: Pointer to current code object (Code*) including heap object tag.
+ * - r27: Current position in input, as negative offset from end of string.
+ * Please notice that this is the byte offset, not the character offset!
+ * - r28: Currently loaded character. Must be loaded using
+ * LoadCurrentCharacter before using any of the dispatch methods.
+ * - r29: Points to tip of backtrack stack
+ * - r30: End of input (points to byte after last character in input).
+ * - r31: Frame pointer. Used to access arguments, local variables and
+ * RegExp registers.
+ * - r12: IP register, used by assembler. Very volatile.
+ * - r1/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:
+ * - fp[44] Isolate* isolate (address of the current isolate)
+ * - fp[40] secondary link/return address used by native call.
+ * - fp[36] lr save area (currently unused)
+ * - fp[32] backchain (currently unused)
+ * --- sp when called ---
+ * - fp[28] return address (lr).
+ * - fp[24] old frame pointer (r31).
+ * - fp[0..20] backup of registers r25..r30
+ * --- frame pointer ----
+ * - fp[-4] direct_call (if 1, direct call from JavaScript code,
+ * if 0, call through the runtime system).
+ * - fp[-8] stack_area_base (high end of the memory area to use as
+ * backtracking stack).
+ * - fp[-12] capture array size (may fit multiple sets of matches)
+ * - fp[-16] int* capture_array (int[num_saved_registers_], for output).
+ * - fp[-20] end of input (address of end of string).
+ * - fp[-24] start of input (address of first character in string).
+ * - fp[-28] start index (character index of start).
+ * - fp[-32] void* input_string (location of a handle containing the string).
+ * - fp[-36] success counter (only for global regexps to count matches).
+ * - fp[-40] Offset of location before start of input (effectively character
+ * string start - 1). Used to initialize capture registers to a
+ * non-position.
+ * - fp[-44] At start (if 1, we are starting at the start of the
+ * string, otherwise 0)
+ * - fp[-48] 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 and the remaining arguments are passed in registers, e.g. 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,
+ * byte* stack_area_base,
+ * Address secondary_return_address, // Only used by native call.
+ * bool direct_call = false)
+ * The call is performed by NativeRegExpMacroAssembler::Execute()
+ * (in regexp-macro-assembler.cc) via the CALL_GENERATED_REGEXP_CODE macro
+ * in ppc/simulator-ppc.h.
+ * When calling as a non-direct call (i.e., from C++ code), the return address
+ * area is overwritten with the LR register by the RegExp code. When doing a
+ * direct call from generated code, the return address is placed there by
+ * the calling code, as in a normal exit frame.
+ */
+
+#define __ ACCESS_MASM(masm_)
+
+RegExpMacroAssemblerPPC::RegExpMacroAssemblerPPC(Isolate* isolate, Zone* zone,
+ Mode mode,
+ int registers_to_save)
+ : NativeRegExpMacroAssembler(isolate, zone),
+ masm_(new MacroAssembler(isolate, NULL, kRegExpCodeSize,
+ CodeObjectRequired::kYes)),
+ mode_(mode),
+ num_registers_(registers_to_save),
+ num_saved_registers_(registers_to_save),
+ entry_label_(),
+ start_label_(),
+ success_label_(),
+ backtrack_label_(),
+ exit_label_(),
+ internal_failure_label_() {
+ DCHECK_EQ(0, registers_to_save % 2);
+
+// Called from C
+ __ function_descriptor();
+
+ __ b(&entry_label_); // We'll write the entry code later.
+ // If the code gets too big or corrupted, an internal exception will be
+ // raised, and we will exit right away.
+ __ bind(&internal_failure_label_);
+ __ li(r3, Operand(FAILURE));
+ __ Ret();
+ __ bind(&start_label_); // And then continue from here.
+}
+
+
+RegExpMacroAssemblerPPC::~RegExpMacroAssemblerPPC() {
+ 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();
+ internal_failure_label_.Unuse();
+}
+
+
+int RegExpMacroAssemblerPPC::stack_limit_slack() {
+ return RegExpStack::kStackLimitSlack;
+}
+
+
+void RegExpMacroAssemblerPPC::AdvanceCurrentPosition(int by) {
+ if (by != 0) {
+ __ addi(current_input_offset(), current_input_offset(),
+ Operand(by * char_size()));
+ }
+}
+
+
+void RegExpMacroAssemblerPPC::AdvanceRegister(int reg, int by) {
+ DCHECK(reg >= 0);
+ DCHECK(reg < num_registers_);
+ if (by != 0) {
+ __ LoadP(r3, register_location(reg), r0);
+ __ mov(r0, Operand(by));
+ __ add(r3, r3, r0);
+ __ StoreP(r3, register_location(reg), r0);
+ }
+}
+
+
+void RegExpMacroAssemblerPPC::Backtrack() {
+ CheckPreemption();
+ // Pop Code* offset from backtrack stack, add Code* and jump to location.
+ Pop(r3);
+ __ add(r3, r3, code_pointer());
+ __ Jump(r3);
+}
+
+
+void RegExpMacroAssemblerPPC::Bind(Label* label) { __ bind(label); }
+
+
+void RegExpMacroAssemblerPPC::CheckCharacter(uint32_t c, Label* on_equal) {
+ __ Cmpli(current_character(), Operand(c), r0);
+ BranchOrBacktrack(eq, on_equal);
+}
+
+
+void RegExpMacroAssemblerPPC::CheckCharacterGT(uc16 limit, Label* on_greater) {
+ __ Cmpli(current_character(), Operand(limit), r0);
+ BranchOrBacktrack(gt, on_greater);
+}
+
+
+void RegExpMacroAssemblerPPC::CheckAtStart(Label* on_at_start) {
+ __ LoadP(r4, MemOperand(frame_pointer(), kStringStartMinusOne));
+ __ addi(r3, current_input_offset(), Operand(-char_size()));
+ __ cmp(r3, r4);
+ BranchOrBacktrack(eq, on_at_start);
+}
+
+
+void RegExpMacroAssemblerPPC::CheckNotAtStart(int cp_offset,
+ Label* on_not_at_start) {
+ __ LoadP(r4, MemOperand(frame_pointer(), kStringStartMinusOne));
+ __ addi(r3, current_input_offset(),
+ Operand(-char_size() + cp_offset * char_size()));
+ __ cmp(r3, r4);
+ BranchOrBacktrack(ne, on_not_at_start);
+}
+
+
+void RegExpMacroAssemblerPPC::CheckCharacterLT(uc16 limit, Label* on_less) {
+ __ Cmpli(current_character(), Operand(limit), r0);
+ BranchOrBacktrack(lt, on_less);
+}
+
+
+void RegExpMacroAssemblerPPC::CheckGreedyLoop(Label* on_equal) {
+ Label backtrack_non_equal;
+ __ LoadP(r3, MemOperand(backtrack_stackpointer(), 0));
+ __ cmp(current_input_offset(), r3);
+ __ bne(&backtrack_non_equal);
+ __ addi(backtrack_stackpointer(), backtrack_stackpointer(),
+ Operand(kPointerSize));
+
+ __ bind(&backtrack_non_equal);
+ BranchOrBacktrack(eq, on_equal);
+}
+
+
+void RegExpMacroAssemblerPPC::CheckNotBackReferenceIgnoreCase(
+ int start_reg, bool read_backward, Label* on_no_match) {
+ Label fallthrough;
+ __ LoadP(r3, register_location(start_reg), r0); // Index of start of capture
+ __ LoadP(r4, register_location(start_reg + 1), r0); // Index of end
+ __ sub(r4, r4, r3, LeaveOE, SetRC); // Length of capture.
+
+ // At this point, the capture registers are either both set or both cleared.
+ // If the capture length is zero, then the capture is either empty or cleared.
+ // Fall through in both cases.
+ __ beq(&fallthrough, cr0);
+
+ // Check that there are enough characters left in the input.
+ if (read_backward) {
+ __ LoadP(r6, MemOperand(frame_pointer(), kStringStartMinusOne));
+ __ add(r6, r6, r4);
+ __ cmp(current_input_offset(), r6);
+ BranchOrBacktrack(le, on_no_match);
+ } else {
+ __ add(r0, r4, current_input_offset(), LeaveOE, SetRC);
+ BranchOrBacktrack(gt, on_no_match, cr0);
+ }
+
+ if (mode_ == LATIN1) {
+ Label success;
+ Label fail;
+ Label loop_check;
+
+ // r3 - offset of start of capture
+ // r4 - length of capture
+ __ add(r3, r3, end_of_input_address());
+ __ add(r5, end_of_input_address(), current_input_offset());
+ if (read_backward) {
+ __ sub(r5, r5, r4); // Offset by length when matching backwards.
+ }
+ __ add(r4, r3, r4);
+
+ // r3 - Address of start of capture.
+ // r4 - Address of end of capture
+ // r5 - Address of current input position.
+
+ Label loop;
+ __ bind(&loop);
+ __ lbz(r6, MemOperand(r3));
+ __ addi(r3, r3, Operand(char_size()));
+ __ lbz(r25, MemOperand(r5));
+ __ addi(r5, r5, Operand(char_size()));
+ __ cmp(r25, r6);
+ __ beq(&loop_check);
+
+ // Mismatch, try case-insensitive match (converting letters to lower-case).
+ __ ori(r6, r6, Operand(0x20)); // Convert capture character to lower-case.
+ __ ori(r25, r25, Operand(0x20)); // Also convert input character.
+ __ cmp(r25, r6);
+ __ bne(&fail);
+ __ subi(r6, r6, Operand('a'));
+ __ cmpli(r6, Operand('z' - 'a')); // Is r6 a lowercase letter?
+ __ ble(&loop_check); // In range 'a'-'z'.
+ // Latin-1: Check for values in range [224,254] but not 247.
+ __ subi(r6, r6, Operand(224 - 'a'));
+ __ cmpli(r6, Operand(254 - 224));
+ __ bgt(&fail); // Weren't Latin-1 letters.
+ __ cmpi(r6, Operand(247 - 224)); // Check for 247.
+ __ beq(&fail);
+
+ __ bind(&loop_check);
+ __ cmp(r3, r4);
+ __ blt(&loop);
+ __ b(&success);
+
+ __ bind(&fail);
+ BranchOrBacktrack(al, on_no_match);
+
+ __ bind(&success);
+ // Compute new value of character position after the matched part.
+ __ sub(current_input_offset(), r5, end_of_input_address());
+ if (read_backward) {
+ __ LoadP(r3, register_location(start_reg)); // Index of start of capture
+ __ LoadP(r4,
+ register_location(start_reg + 1)); // Index of end of capture
+ __ add(current_input_offset(), current_input_offset(), r3);
+ __ sub(current_input_offset(), current_input_offset(), r4);
+ }
+ } else {
+ DCHECK(mode_ == UC16);
+ int argument_count = 4;
+ __ PrepareCallCFunction(argument_count, r5);
+
+ // r3 - offset of start of capture
+ // r4 - length of capture
+
+ // Put arguments into arguments registers.
+ // Parameters are
+ // r3: Address byte_offset1 - Address captured substring's start.
+ // r4: Address byte_offset2 - Address of current character position.
+ // r5: size_t byte_length - length of capture in bytes(!)
+ // r6: Isolate* isolate
+
+ // Address of start of capture.
+ __ add(r3, r3, end_of_input_address());
+ // Length of capture.
+ __ mr(r5, r4);
+ // Save length in callee-save register for use on return.
+ __ mr(r25, r4);
+ // Address of current input position.
+ __ add(r4, current_input_offset(), end_of_input_address());
+ if (read_backward) {
+ __ sub(r4, r4, r25);
+ }
+ // Isolate.
+ __ mov(r6, Operand(ExternalReference::isolate_address(isolate())));
+
+ {
+ AllowExternalCallThatCantCauseGC scope(masm_);
+ ExternalReference function =
+ ExternalReference::re_case_insensitive_compare_uc16(isolate());
+ __ CallCFunction(function, argument_count);
+ }
+
+ // Check if function returned non-zero for success or zero for failure.
+ __ cmpi(r3, Operand::Zero());
+ BranchOrBacktrack(eq, on_no_match);
+
+ // On success, advance position by length of capture.
+ if (read_backward) {
+ __ sub(current_input_offset(), current_input_offset(), r25);
+ } else {
+ __ add(current_input_offset(), current_input_offset(), r25);
+ }
+ }
+
+ __ bind(&fallthrough);
+}
+
+
+void RegExpMacroAssemblerPPC::CheckNotBackReference(int start_reg,
+ bool read_backward,
+ Label* on_no_match) {
+ Label fallthrough;
+ Label success;
+
+ // Find length of back-referenced capture.
+ __ LoadP(r3, register_location(start_reg), r0);
+ __ LoadP(r4, register_location(start_reg + 1), r0);
+ __ sub(r4, r4, r3, LeaveOE, SetRC); // Length to check.
+
+ // At this point, the capture registers are either both set or both cleared.
+ // If the capture length is zero, then the capture is either empty or cleared.
+ // Fall through in both cases.
+ __ beq(&fallthrough, cr0);
+
+ // Check that there are enough characters left in the input.
+ if (read_backward) {
+ __ LoadP(r6, MemOperand(frame_pointer(), kStringStartMinusOne));
+ __ add(r6, r6, r4);
+ __ cmp(current_input_offset(), r6);
+ BranchOrBacktrack(lt, on_no_match);
+ } else {
+ __ add(r0, r4, current_input_offset(), LeaveOE, SetRC);
+ BranchOrBacktrack(gt, on_no_match, cr0);
+ }
+
+ // r3 - offset of start of capture
+ // r4 - length of capture
+ __ add(r3, r3, end_of_input_address());
+ __ add(r5, end_of_input_address(), current_input_offset());
+ if (read_backward) {
+ __ sub(r5, r5, r4); // Offset by length when matching backwards.
+ }
+ __ add(r4, r4, r3);
+
+ Label loop;
+ __ bind(&loop);
+ if (mode_ == LATIN1) {
+ __ lbz(r6, MemOperand(r3));
+ __ addi(r3, r3, Operand(char_size()));
+ __ lbz(r25, MemOperand(r5));
+ __ addi(r5, r5, Operand(char_size()));
+ } else {
+ DCHECK(mode_ == UC16);
+ __ lhz(r6, MemOperand(r3));
+ __ addi(r3, r3, Operand(char_size()));
+ __ lhz(r25, MemOperand(r5));
+ __ addi(r5, r5, Operand(char_size()));
+ }
+ __ cmp(r6, r25);
+ BranchOrBacktrack(ne, on_no_match);
+ __ cmp(r3, r4);
+ __ blt(&loop);
+
+ // Move current character position to position after match.
+ __ sub(current_input_offset(), r5, end_of_input_address());
+ if (read_backward) {
+ __ LoadP(r3, register_location(start_reg)); // Index of start of capture
+ __ LoadP(r4, register_location(start_reg + 1)); // Index of end of capture
+ __ add(current_input_offset(), current_input_offset(), r3);
+ __ sub(current_input_offset(), current_input_offset(), r4);
+ }
+
+ __ bind(&fallthrough);
+}
+
+
+void RegExpMacroAssemblerPPC::CheckNotCharacter(unsigned c,
+ Label* on_not_equal) {
+ __ Cmpli(current_character(), Operand(c), r0);
+ BranchOrBacktrack(ne, on_not_equal);
+}
+
+
+void RegExpMacroAssemblerPPC::CheckCharacterAfterAnd(uint32_t c, uint32_t mask,
+ Label* on_equal) {
+ __ mov(r0, Operand(mask));
+ if (c == 0) {
+ __ and_(r3, current_character(), r0, SetRC);
+ } else {
+ __ and_(r3, current_character(), r0);
+ __ Cmpli(r3, Operand(c), r0, cr0);
+ }
+ BranchOrBacktrack(eq, on_equal, cr0);
+}
+
+
+void RegExpMacroAssemblerPPC::CheckNotCharacterAfterAnd(unsigned c,
+ unsigned mask,
+ Label* on_not_equal) {
+ __ mov(r0, Operand(mask));
+ if (c == 0) {
+ __ and_(r3, current_character(), r0, SetRC);
+ } else {
+ __ and_(r3, current_character(), r0);
+ __ Cmpli(r3, Operand(c), r0, cr0);
+ }
+ BranchOrBacktrack(ne, on_not_equal, cr0);
+}
+
+
+void RegExpMacroAssemblerPPC::CheckNotCharacterAfterMinusAnd(
+ uc16 c, uc16 minus, uc16 mask, Label* on_not_equal) {
+ DCHECK(minus < String::kMaxUtf16CodeUnit);
+ __ subi(r3, current_character(), Operand(minus));
+ __ mov(r0, Operand(mask));
+ __ and_(r3, r3, r0);
+ __ Cmpli(r3, Operand(c), r0);
+ BranchOrBacktrack(ne, on_not_equal);
+}
+
+
+void RegExpMacroAssemblerPPC::CheckCharacterInRange(uc16 from, uc16 to,
+ Label* on_in_range) {
+ __ mov(r0, Operand(from));
+ __ sub(r3, current_character(), r0);
+ __ Cmpli(r3, Operand(to - from), r0);
+ BranchOrBacktrack(le, on_in_range); // Unsigned lower-or-same condition.
+}
+
+
+void RegExpMacroAssemblerPPC::CheckCharacterNotInRange(uc16 from, uc16 to,
+ Label* on_not_in_range) {
+ __ mov(r0, Operand(from));
+ __ sub(r3, current_character(), r0);
+ __ Cmpli(r3, Operand(to - from), r0);
+ BranchOrBacktrack(gt, on_not_in_range); // Unsigned higher condition.
+}
+
+
+void RegExpMacroAssemblerPPC::CheckBitInTable(Handle<ByteArray> table,
+ Label* on_bit_set) {
+ __ mov(r3, Operand(table));
+ if (mode_ != LATIN1 || kTableMask != String::kMaxOneByteCharCode) {
+ __ andi(r4, current_character(), Operand(kTableSize - 1));
+ __ addi(r4, r4, Operand(ByteArray::kHeaderSize - kHeapObjectTag));
+ } else {
+ __ addi(r4, current_character(),
+ Operand(ByteArray::kHeaderSize - kHeapObjectTag));
+ }
+ __ lbzx(r3, MemOperand(r3, r4));
+ __ cmpi(r3, Operand::Zero());
+ BranchOrBacktrack(ne, on_bit_set);
+}
+
+
+bool RegExpMacroAssemblerPPC::CheckSpecialCharacterClass(uc16 type,
+ Label* on_no_match) {
+ // Range checks (c in min..max) are generally implemented by an unsigned
+ // (c - min) <= (max - min) check
+ switch (type) {
+ case 's':
+ // Match space-characters
+ if (mode_ == LATIN1) {
+ // One byte space characters are '\t'..'\r', ' ' and \u00a0.
+ Label success;
+ __ cmpi(current_character(), Operand(' '));
+ __ beq(&success);
+ // Check range 0x09..0x0d
+ __ subi(r3, current_character(), Operand('\t'));
+ __ cmpli(r3, Operand('\r' - '\t'));
+ __ ble(&success);
+ // \u00a0 (NBSP).
+ __ cmpi(r3, Operand(0x00a0 - '\t'));
+ BranchOrBacktrack(ne, on_no_match);
+ __ bind(&success);
+ return true;
+ }
+ return false;
+ case 'S':
+ // The emitted code for generic character classes is good enough.
+ return false;
+ case 'd':
+ // Match ASCII digits ('0'..'9')
+ __ subi(r3, current_character(), Operand('0'));
+ __ cmpli(r3, Operand('9' - '0'));
+ BranchOrBacktrack(gt, on_no_match);
+ return true;
+ case 'D':
+ // Match non ASCII-digits
+ __ subi(r3, current_character(), Operand('0'));
+ __ cmpli(r3, Operand('9' - '0'));
+ BranchOrBacktrack(le, on_no_match);
+ return true;
+ case '.': {
+ // Match non-newlines (not 0x0a('\n'), 0x0d('\r'), 0x2028 and 0x2029)
+ __ xori(r3, current_character(), Operand(0x01));
+ // See if current character is '\n'^1 or '\r'^1, i.e., 0x0b or 0x0c
+ __ subi(r3, r3, Operand(0x0b));
+ __ cmpli(r3, Operand(0x0c - 0x0b));
+ BranchOrBacktrack(le, on_no_match);
+ if (mode_ == UC16) {
+ // Compare original value to 0x2028 and 0x2029, using the already
+ // computed (current_char ^ 0x01 - 0x0b). I.e., check for
+ // 0x201d (0x2028 - 0x0b) or 0x201e.
+ __ subi(r3, r3, Operand(0x2028 - 0x0b));
+ __ cmpli(r3, Operand(1));
+ BranchOrBacktrack(le, on_no_match);
+ }
+ return true;
+ }
+ case 'n': {
+ // Match newlines (0x0a('\n'), 0x0d('\r'), 0x2028 and 0x2029)
+ __ xori(r3, current_character(), Operand(0x01));
+ // See if current character is '\n'^1 or '\r'^1, i.e., 0x0b or 0x0c
+ __ subi(r3, r3, Operand(0x0b));
+ __ cmpli(r3, Operand(0x0c - 0x0b));
+ if (mode_ == LATIN1) {
+ BranchOrBacktrack(gt, on_no_match);
+ } else {
+ Label done;
+ __ ble(&done);
+ // Compare original value to 0x2028 and 0x2029, using the already
+ // computed (current_char ^ 0x01 - 0x0b). I.e., check for
+ // 0x201d (0x2028 - 0x0b) or 0x201e.
+ __ subi(r3, r3, Operand(0x2028 - 0x0b));
+ __ cmpli(r3, Operand(1));
+ BranchOrBacktrack(gt, on_no_match);
+ __ bind(&done);
+ }
+ return true;
+ }
+ case 'w': {
+ if (mode_ != LATIN1) {
+ // Table is 256 entries, so all Latin1 characters can be tested.
+ __ cmpi(current_character(), Operand('z'));
+ BranchOrBacktrack(gt, on_no_match);
+ }
+ ExternalReference map = ExternalReference::re_word_character_map();
+ __ mov(r3, Operand(map));
+ __ lbzx(r3, MemOperand(r3, current_character()));
+ __ cmpli(r3, Operand::Zero());
+ BranchOrBacktrack(eq, on_no_match);
+ return true;
+ }
+ case 'W': {
+ Label done;
+ if (mode_ != LATIN1) {
+ // Table is 256 entries, so all Latin1 characters can be tested.
+ __ cmpli(current_character(), Operand('z'));
+ __ bgt(&done);
+ }
+ ExternalReference map = ExternalReference::re_word_character_map();
+ __ mov(r3, Operand(map));
+ __ lbzx(r3, MemOperand(r3, current_character()));
+ __ cmpli(r3, Operand::Zero());
+ BranchOrBacktrack(ne, on_no_match);
+ if (mode_ != LATIN1) {
+ __ bind(&done);
+ }
+ return true;
+ }
+ case '*':
+ // Match any character.
+ return true;
+ // No custom implementation (yet): s(UC16), S(UC16).
+ default:
+ return false;
+ }
+}
+
+
+void RegExpMacroAssemblerPPC::Fail() {
+ __ li(r3, Operand(FAILURE));
+ __ b(&exit_label_);
+}
+
+
+Handle<HeapObject> RegExpMacroAssemblerPPC::GetCode(Handle<String> source) {
+ Label return_r3;
+
+ if (masm_->has_exception()) {
+ // If the code gets corrupted due to long regular expressions and lack of
+ // space on trampolines, an internal exception flag is set. If this case
+ // is detected, we will jump into exit sequence right away.
+ __ bind_to(&entry_label_, internal_failure_label_.pos());
+ } else {
+ // Finalize code - write the entry point code now we know how many
+ // registers we need.
+
+ // Entry code:
+ __ bind(&entry_label_);
+
+ // Tell the system that we have a stack frame. Because the type
+ // is MANUAL, no is generated.
+ FrameScope scope(masm_, StackFrame::MANUAL);
+
+ // Ensure register assigments are consistent with callee save mask
+ DCHECK(r25.bit() & kRegExpCalleeSaved);
+ DCHECK(code_pointer().bit() & kRegExpCalleeSaved);
+ DCHECK(current_input_offset().bit() & kRegExpCalleeSaved);
+ DCHECK(current_character().bit() & kRegExpCalleeSaved);
+ DCHECK(backtrack_stackpointer().bit() & kRegExpCalleeSaved);
+ DCHECK(end_of_input_address().bit() & kRegExpCalleeSaved);
+ DCHECK(frame_pointer().bit() & kRegExpCalleeSaved);
+
+ // Actually emit code to start a new stack frame.
+ // Push arguments
+ // Save callee-save registers.
+ // Start new stack frame.
+ // Store link register in existing stack-cell.
+ // Order here should correspond to order of offset constants in header file.
+ RegList registers_to_retain = kRegExpCalleeSaved;
+ RegList argument_registers = r3.bit() | r4.bit() | r5.bit() | r6.bit() |
+ r7.bit() | r8.bit() | r9.bit() | r10.bit();
+ __ mflr(r0);
+ __ push(r0);
+ __ MultiPush(argument_registers | registers_to_retain);
+ // Set frame pointer in space for it if this is not a direct call
+ // from generated code.
+ __ addi(frame_pointer(), sp, Operand(8 * kPointerSize));
+ __ li(r3, Operand::Zero());
+ __ push(r3); // Make room for success counter and initialize it to 0.
+ __ push(r3); // Make room for "string start - 1" constant.
+ // Check if we have space on the stack for registers.
+ Label stack_limit_hit;
+ Label stack_ok;
+
+ ExternalReference stack_limit =
+ ExternalReference::address_of_stack_limit(isolate());
+ __ mov(r3, Operand(stack_limit));
+ __ LoadP(r3, MemOperand(r3));
+ __ sub(r3, sp, r3, LeaveOE, SetRC);
+ // Handle it if the stack pointer is already below the stack limit.
+ __ ble(&stack_limit_hit, cr0);
+ // Check if there is room for the variable number of registers above
+ // the stack limit.
+ __ Cmpli(r3, Operand(num_registers_ * kPointerSize), r0);
+ __ bge(&stack_ok);
+ // Exit with OutOfMemory exception. There is not enough space on the stack
+ // for our working registers.
+ __ li(r3, Operand(EXCEPTION));
+ __ b(&return_r3);
+
+ __ bind(&stack_limit_hit);
+ CallCheckStackGuardState(r3);
+ __ cmpi(r3, Operand::Zero());
+ // If returned value is non-zero, we exit with the returned value as result.
+ __ bne(&return_r3);
+
+ __ bind(&stack_ok);
+
+ // Allocate space on stack for registers.
+ __ Add(sp, sp, -num_registers_ * kPointerSize, r0);
+ // Load string end.
+ __ LoadP(end_of_input_address(), MemOperand(frame_pointer(), kInputEnd));
+ // Load input start.
+ __ LoadP(r3, MemOperand(frame_pointer(), kInputStart));
+ // Find negative length (offset of start relative to end).
+ __ sub(current_input_offset(), r3, end_of_input_address());
+ // Set r3 to address of char before start of the input string
+ // (effectively string position -1).
+ __ LoadP(r4, MemOperand(frame_pointer(), kStartIndex));
+ __ subi(r3, current_input_offset(), Operand(char_size()));
+ if (mode_ == UC16) {
+ __ ShiftLeftImm(r0, r4, Operand(1));
+ __ sub(r3, r3, r0);
+ } else {
+ __ sub(r3, r3, r4);
+ }
+ // Store this value in a local variable, for use when clearing
+ // position registers.
+ __ StoreP(r3, MemOperand(frame_pointer(), kStringStartMinusOne));
+
+ // Initialize code pointer register
+ __ mov(code_pointer(), Operand(masm_->CodeObject()));
+
+ Label load_char_start_regexp, start_regexp;
+ // Load newline if index is at start, previous character otherwise.
+ __ cmpi(r4, Operand::Zero());
+ __ bne(&load_char_start_regexp);
+ __ li(current_character(), Operand('\n'));
+ __ b(&start_regexp);
+
+ // Global regexp restarts matching here.
+ __ bind(&load_char_start_regexp);
+ // Load previous char as initial value of current character register.
+ LoadCurrentCharacterUnchecked(-1, 1);
+ __ bind(&start_regexp);
+
+ // Initialize on-stack registers.
+ if (num_saved_registers_ > 0) { // Always is, if generated from a regexp.
+ // Fill saved registers with initial value = start offset - 1
+ if (num_saved_registers_ > 8) {
+ // One slot beyond address of register 0.
+ __ addi(r4, frame_pointer(), Operand(kRegisterZero + kPointerSize));
+ __ li(r5, Operand(num_saved_registers_));
+ __ mtctr(r5);
+ Label init_loop;
+ __ bind(&init_loop);
+ __ StorePU(r3, MemOperand(r4, -kPointerSize));
+ __ bdnz(&init_loop);
+ } else {
+ for (int i = 0; i < num_saved_registers_; i++) {
+ __ StoreP(r3, register_location(i), r0);
+ }
+ }
+ }
+
+ // Initialize backtrack stack pointer.
+ __ LoadP(backtrack_stackpointer(),
+ MemOperand(frame_pointer(), kStackHighEnd));
+
+ __ b(&start_label_);
+
+ // Exit code:
+ if (success_label_.is_linked()) {
+ // Save captures when successful.
+ __ bind(&success_label_);
+ if (num_saved_registers_ > 0) {
+ // copy captures to output
+ __ LoadP(r4, MemOperand(frame_pointer(), kInputStart));
+ __ LoadP(r3, MemOperand(frame_pointer(), kRegisterOutput));
+ __ LoadP(r5, MemOperand(frame_pointer(), kStartIndex));
+ __ sub(r4, end_of_input_address(), r4);
+ // r4 is length of input in bytes.
+ if (mode_ == UC16) {
+ __ ShiftRightImm(r4, r4, Operand(1));
+ }
+ // r4 is length of input in characters.
+ __ add(r4, r4, r5);
+ // r4 is length of string in characters.
+
+ DCHECK_EQ(0, num_saved_registers_ % 2);
+ // Always an even number of capture registers. This allows us to
+ // unroll the loop once to add an operation between a load of a register
+ // and the following use of that register.
+ for (int i = 0; i < num_saved_registers_; i += 2) {
+ __ LoadP(r5, register_location(i), r0);
+ __ LoadP(r6, register_location(i + 1), r0);
+ if (i == 0 && global_with_zero_length_check()) {
+ // Keep capture start in r25 for the zero-length check later.
+ __ mr(r25, r5);
+ }
+ if (mode_ == UC16) {
+ __ ShiftRightArithImm(r5, r5, 1);
+ __ add(r5, r4, r5);
+ __ ShiftRightArithImm(r6, r6, 1);
+ __ add(r6, r4, r6);
+ } else {
+ __ add(r5, r4, r5);
+ __ add(r6, r4, r6);
+ }
+ __ stw(r5, MemOperand(r3));
+ __ addi(r3, r3, Operand(kIntSize));
+ __ stw(r6, MemOperand(r3));
+ __ addi(r3, r3, Operand(kIntSize));
+ }
+ }
+
+ if (global()) {
+ // Restart matching if the regular expression is flagged as global.
+ __ LoadP(r3, MemOperand(frame_pointer(), kSuccessfulCaptures));
+ __ LoadP(r4, MemOperand(frame_pointer(), kNumOutputRegisters));
+ __ LoadP(r5, MemOperand(frame_pointer(), kRegisterOutput));
+ // Increment success counter.
+ __ addi(r3, r3, Operand(1));
+ __ StoreP(r3, MemOperand(frame_pointer(), kSuccessfulCaptures));
+ // Capture results have been stored, so the number of remaining global
+ // output registers is reduced by the number of stored captures.
+ __ subi(r4, r4, Operand(num_saved_registers_));
+ // Check whether we have enough room for another set of capture results.
+ __ cmpi(r4, Operand(num_saved_registers_));
+ __ blt(&return_r3);
+
+ __ StoreP(r4, MemOperand(frame_pointer(), kNumOutputRegisters));
+ // Advance the location for output.
+ __ addi(r5, r5, Operand(num_saved_registers_ * kIntSize));
+ __ StoreP(r5, MemOperand(frame_pointer(), kRegisterOutput));
+
+ // Prepare r3 to initialize registers with its value in the next run.
+ __ LoadP(r3, MemOperand(frame_pointer(), kStringStartMinusOne));
+
+ if (global_with_zero_length_check()) {
+ // Special case for zero-length matches.
+ // r25: capture start index
+ __ cmp(current_input_offset(), r25);
+ // Not a zero-length match, restart.
+ __ bne(&load_char_start_regexp);
+ // Offset from the end is zero if we already reached the end.
+ __ cmpi(current_input_offset(), Operand::Zero());
+ __ beq(&exit_label_);
+ // Advance current position after a zero-length match.
+ __ addi(current_input_offset(), current_input_offset(),
+ Operand((mode_ == UC16) ? 2 : 1));
+ }
+
+ __ b(&load_char_start_regexp);
+ } else {
+ __ li(r3, Operand(SUCCESS));
+ }
+ }
+
+ // Exit and return r3
+ __ bind(&exit_label_);
+ if (global()) {
+ __ LoadP(r3, MemOperand(frame_pointer(), kSuccessfulCaptures));
+ }
+
+ __ bind(&return_r3);
+ // Skip sp past regexp registers and local variables..
+ __ mr(sp, frame_pointer());
+ // Restore registers r25..r31 and return (restoring lr to pc).
+ __ MultiPop(registers_to_retain);
+ __ pop(r0);
+ __ mtlr(r0);
+ __ blr();
+
+ // Backtrack code (branch target for conditional backtracks).
+ if (backtrack_label_.is_linked()) {
+ __ bind(&backtrack_label_);
+ Backtrack();
+ }
+
+ Label exit_with_exception;
+
+ // Preempt-code
+ if (check_preempt_label_.is_linked()) {
+ SafeCallTarget(&check_preempt_label_);
+
+ CallCheckStackGuardState(r3);
+ __ cmpi(r3, Operand::Zero());
+ // If returning non-zero, we should end execution with the given
+ // result as return value.
+ __ bne(&return_r3);
+
+ // String might have moved: Reload end of string from frame.
+ __ LoadP(end_of_input_address(), MemOperand(frame_pointer(), kInputEnd));
+ SafeReturn();
+ }
+
+ // Backtrack stack overflow code.
+ if (stack_overflow_label_.is_linked()) {
+ SafeCallTarget(&stack_overflow_label_);
+ // Reached if the backtrack-stack limit has been hit.
+ Label grow_failed;
+
+ // Call GrowStack(backtrack_stackpointer(), &stack_base)
+ static const int num_arguments = 3;
+ __ PrepareCallCFunction(num_arguments, r3);
+ __ mr(r3, backtrack_stackpointer());
+ __ addi(r4, frame_pointer(), Operand(kStackHighEnd));
+ __ mov(r5, Operand(ExternalReference::isolate_address(isolate())));
+ ExternalReference grow_stack =
+ ExternalReference::re_grow_stack(isolate());
+ __ CallCFunction(grow_stack, num_arguments);
+ // If return NULL, we have failed to grow the stack, and
+ // must exit with a stack-overflow exception.
+ __ cmpi(r3, Operand::Zero());
+ __ beq(&exit_with_exception);
+ // Otherwise use return value as new stack pointer.
+ __ mr(backtrack_stackpointer(), r3);
+ // Restore saved registers and continue.
+ SafeReturn();
+ }
+
+ if (exit_with_exception.is_linked()) {
+ // If any of the code above needed to exit with an exception.
+ __ bind(&exit_with_exception);
+ // Exit with Result EXCEPTION(-1) to signal thrown exception.
+ __ li(r3, Operand(EXCEPTION));
+ __ b(&return_r3);
+ }
+ }
+
+ CodeDesc code_desc;
+ masm_->GetCode(&code_desc);
+ Handle<Code> code = isolate()->factory()->NewCode(
+ code_desc, Code::ComputeFlags(Code::REGEXP), masm_->CodeObject());
+ PROFILE(masm_->isolate(), RegExpCodeCreateEvent(*code, *source));
+ return Handle<HeapObject>::cast(code);
+}
+
+
+void RegExpMacroAssemblerPPC::GoTo(Label* to) { BranchOrBacktrack(al, to); }
+
+
+void RegExpMacroAssemblerPPC::IfRegisterGE(int reg, int comparand,
+ Label* if_ge) {
+ __ LoadP(r3, register_location(reg), r0);
+ __ Cmpi(r3, Operand(comparand), r0);
+ BranchOrBacktrack(ge, if_ge);
+}
+
+
+void RegExpMacroAssemblerPPC::IfRegisterLT(int reg, int comparand,
+ Label* if_lt) {
+ __ LoadP(r3, register_location(reg), r0);
+ __ Cmpi(r3, Operand(comparand), r0);
+ BranchOrBacktrack(lt, if_lt);
+}
+
+
+void RegExpMacroAssemblerPPC::IfRegisterEqPos(int reg, Label* if_eq) {
+ __ LoadP(r3, register_location(reg), r0);
+ __ cmp(r3, current_input_offset());
+ BranchOrBacktrack(eq, if_eq);
+}
+
+
+RegExpMacroAssembler::IrregexpImplementation
+RegExpMacroAssemblerPPC::Implementation() {
+ return kPPCImplementation;
+}
+
+
+void RegExpMacroAssemblerPPC::LoadCurrentCharacter(int cp_offset,
+ Label* on_end_of_input,
+ bool check_bounds,
+ int characters) {
+ DCHECK(cp_offset < (1 << 30)); // Be sane! (And ensure negation works)
+ if (check_bounds) {
+ if (cp_offset >= 0) {
+ CheckPosition(cp_offset + characters - 1, on_end_of_input);
+ } else {
+ CheckPosition(cp_offset, on_end_of_input);
+ }
+ }
+ LoadCurrentCharacterUnchecked(cp_offset, characters);
+}
+
+
+void RegExpMacroAssemblerPPC::PopCurrentPosition() {
+ Pop(current_input_offset());
+}
+
+
+void RegExpMacroAssemblerPPC::PopRegister(int register_index) {
+ Pop(r3);
+ __ StoreP(r3, register_location(register_index), r0);
+}
+
+
+void RegExpMacroAssemblerPPC::PushBacktrack(Label* label) {
+ __ mov_label_offset(r3, label);
+ Push(r3);
+ CheckStackLimit();
+}
+
+
+void RegExpMacroAssemblerPPC::PushCurrentPosition() {
+ Push(current_input_offset());
+}
+
+
+void RegExpMacroAssemblerPPC::PushRegister(int register_index,
+ StackCheckFlag check_stack_limit) {
+ __ LoadP(r3, register_location(register_index), r0);
+ Push(r3);
+ if (check_stack_limit) CheckStackLimit();
+}
+
+
+void RegExpMacroAssemblerPPC::ReadCurrentPositionFromRegister(int reg) {
+ __ LoadP(current_input_offset(), register_location(reg), r0);
+}
+
+
+void RegExpMacroAssemblerPPC::ReadStackPointerFromRegister(int reg) {
+ __ LoadP(backtrack_stackpointer(), register_location(reg), r0);
+ __ LoadP(r3, MemOperand(frame_pointer(), kStackHighEnd));
+ __ add(backtrack_stackpointer(), backtrack_stackpointer(), r3);
+}
+
+
+void RegExpMacroAssemblerPPC::SetCurrentPositionFromEnd(int by) {
+ Label after_position;
+ __ Cmpi(current_input_offset(), Operand(-by * char_size()), r0);
+ __ bge(&after_position);
+ __ mov(current_input_offset(), Operand(-by * char_size()));
+ // On RegExp code entry (where this operation is used), the character before
+ // the current position is expected to be already loaded.
+ // We have advanced the position, so it's safe to read backwards.
+ LoadCurrentCharacterUnchecked(-1, 1);
+ __ bind(&after_position);
+}
+
+
+void RegExpMacroAssemblerPPC::SetRegister(int register_index, int to) {
+ DCHECK(register_index >= num_saved_registers_); // Reserved for positions!
+ __ mov(r3, Operand(to));
+ __ StoreP(r3, register_location(register_index), r0);
+}
+
+
+bool RegExpMacroAssemblerPPC::Succeed() {
+ __ b(&success_label_);
+ return global();
+}
+
+
+void RegExpMacroAssemblerPPC::WriteCurrentPositionToRegister(int reg,
+ int cp_offset) {
+ if (cp_offset == 0) {
+ __ StoreP(current_input_offset(), register_location(reg), r0);
+ } else {
+ __ mov(r0, Operand(cp_offset * char_size()));
+ __ add(r3, current_input_offset(), r0);
+ __ StoreP(r3, register_location(reg), r0);
+ }
+}
+
+
+void RegExpMacroAssemblerPPC::ClearRegisters(int reg_from, int reg_to) {
+ DCHECK(reg_from <= reg_to);
+ __ LoadP(r3, MemOperand(frame_pointer(), kStringStartMinusOne));
+ for (int reg = reg_from; reg <= reg_to; reg++) {
+ __ StoreP(r3, register_location(reg), r0);
+ }
+}
+
+
+void RegExpMacroAssemblerPPC::WriteStackPointerToRegister(int reg) {
+ __ LoadP(r4, MemOperand(frame_pointer(), kStackHighEnd));
+ __ sub(r3, backtrack_stackpointer(), r4);
+ __ StoreP(r3, register_location(reg), r0);
+}
+
+
+// Private methods:
+
+void RegExpMacroAssemblerPPC::CallCheckStackGuardState(Register scratch) {
+ int frame_alignment = masm_->ActivationFrameAlignment();
+ int stack_space = kNumRequiredStackFrameSlots;
+ int stack_passed_arguments = 1; // space for return address pointer
+
+ // The following stack manipulation logic is similar to
+ // PrepareCallCFunction. However, we need an extra slot on the
+ // stack to house the return address parameter.
+ if (frame_alignment > kPointerSize) {
+ // Make stack end at alignment and make room for stack arguments
+ // -- preserving original value of sp.
+ __ mr(scratch, sp);
+ __ addi(sp, sp, Operand(-(stack_passed_arguments + 1) * kPointerSize));
+ DCHECK(base::bits::IsPowerOfTwo32(frame_alignment));
+ __ ClearRightImm(sp, sp, Operand(WhichPowerOf2(frame_alignment)));
+ __ StoreP(scratch, MemOperand(sp, stack_passed_arguments * kPointerSize));
+ } else {
+ // Make room for stack arguments
+ stack_space += stack_passed_arguments;
+ }
+
+ // Allocate frame with required slots to make ABI work.
+ __ li(r0, Operand::Zero());
+ __ StorePU(r0, MemOperand(sp, -stack_space * kPointerSize));
+
+ // RegExp code frame pointer.
+ __ mr(r5, frame_pointer());
+ // Code* of self.
+ __ mov(r4, Operand(masm_->CodeObject()));
+ // r3 will point to the return address, placed by DirectCEntry.
+ __ addi(r3, sp, Operand(kStackFrameExtraParamSlot * kPointerSize));
+
+ ExternalReference stack_guard_check =
+ ExternalReference::re_check_stack_guard_state(isolate());
+ __ mov(ip, Operand(stack_guard_check));
+ DirectCEntryStub stub(isolate());
+ stub.GenerateCall(masm_, ip);
+
+ // Restore the stack pointer
+ stack_space = kNumRequiredStackFrameSlots + stack_passed_arguments;
+ if (frame_alignment > kPointerSize) {
+ __ LoadP(sp, MemOperand(sp, stack_space * kPointerSize));
+ } else {
+ __ addi(sp, sp, Operand(stack_space * kPointerSize));
+ }
+
+ __ mov(code_pointer(), Operand(masm_->CodeObject()));
+}
+
+
+// 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));
+}
+
+
+template <typename T>
+static T* frame_entry_address(Address re_frame, int frame_offset) {
+ return reinterpret_cast<T*>(re_frame + frame_offset);
+}
+
+
+int RegExpMacroAssemblerPPC::CheckStackGuardState(Address* return_address,
+ Code* re_code,
+ Address re_frame) {
+ return NativeRegExpMacroAssembler::CheckStackGuardState(
+ frame_entry<Isolate*>(re_frame, kIsolate),
+ frame_entry<intptr_t>(re_frame, kStartIndex),
+ frame_entry<intptr_t>(re_frame, kDirectCall) == 1, return_address,
+ re_code, frame_entry_address<String*>(re_frame, kInputString),
+ frame_entry_address<const byte*>(re_frame, kInputStart),
+ frame_entry_address<const byte*>(re_frame, kInputEnd));
+}
+
+
+MemOperand RegExpMacroAssemblerPPC::register_location(int register_index) {
+ DCHECK(register_index < (1 << 30));
+ if (num_registers_ <= register_index) {
+ num_registers_ = register_index + 1;
+ }
+ return MemOperand(frame_pointer(),
+ kRegisterZero - register_index * kPointerSize);
+}
+
+
+void RegExpMacroAssemblerPPC::CheckPosition(int cp_offset,
+ Label* on_outside_input) {
+ if (cp_offset >= 0) {
+ __ Cmpi(current_input_offset(), Operand(-cp_offset * char_size()), r0);
+ BranchOrBacktrack(ge, on_outside_input);
+ } else {
+ __ LoadP(r4, MemOperand(frame_pointer(), kStringStartMinusOne));
+ __ addi(r3, current_input_offset(), Operand(cp_offset * char_size()));
+ __ cmp(r3, r4);
+ BranchOrBacktrack(le, on_outside_input);
+ }
+}
+
+
+void RegExpMacroAssemblerPPC::BranchOrBacktrack(Condition condition, Label* to,
+ CRegister cr) {
+ if (condition == al) { // Unconditional.
+ if (to == NULL) {
+ Backtrack();
+ return;
+ }
+ __ b(to);
+ return;
+ }
+ if (to == NULL) {
+ __ b(condition, &backtrack_label_, cr);
+ return;
+ }
+ __ b(condition, to, cr);
+}
+
+
+void RegExpMacroAssemblerPPC::SafeCall(Label* to, Condition cond,
+ CRegister cr) {
+ __ b(cond, to, cr, SetLK);
+}
+
+
+void RegExpMacroAssemblerPPC::SafeReturn() {
+ __ pop(r0);
+ __ mov(ip, Operand(masm_->CodeObject()));
+ __ add(r0, r0, ip);
+ __ mtlr(r0);
+ __ blr();
+}
+
+
+void RegExpMacroAssemblerPPC::SafeCallTarget(Label* name) {
+ __ bind(name);
+ __ mflr(r0);
+ __ mov(ip, Operand(masm_->CodeObject()));
+ __ sub(r0, r0, ip);
+ __ push(r0);
+}
+
+
+void RegExpMacroAssemblerPPC::Push(Register source) {
+ DCHECK(!source.is(backtrack_stackpointer()));
+ __ StorePU(source, MemOperand(backtrack_stackpointer(), -kPointerSize));
+}
+
+
+void RegExpMacroAssemblerPPC::Pop(Register target) {
+ DCHECK(!target.is(backtrack_stackpointer()));
+ __ LoadP(target, MemOperand(backtrack_stackpointer()));
+ __ addi(backtrack_stackpointer(), backtrack_stackpointer(),
+ Operand(kPointerSize));
+}
+
+
+void RegExpMacroAssemblerPPC::CheckPreemption() {
+ // Check for preemption.
+ ExternalReference stack_limit =
+ ExternalReference::address_of_stack_limit(isolate());
+ __ mov(r3, Operand(stack_limit));
+ __ LoadP(r3, MemOperand(r3));
+ __ cmpl(sp, r3);
+ SafeCall(&check_preempt_label_, le);
+}
+
+
+void RegExpMacroAssemblerPPC::CheckStackLimit() {
+ ExternalReference stack_limit =
+ ExternalReference::address_of_regexp_stack_limit(isolate());
+ __ mov(r3, Operand(stack_limit));
+ __ LoadP(r3, MemOperand(r3));
+ __ cmpl(backtrack_stackpointer(), r3);
+ SafeCall(&stack_overflow_label_, le);
+}
+
+
+bool RegExpMacroAssemblerPPC::CanReadUnaligned() {
+ return CpuFeatures::IsSupported(UNALIGNED_ACCESSES) && !slow_safe();
+}
+
+
+void RegExpMacroAssemblerPPC::LoadCurrentCharacterUnchecked(int cp_offset,
+ int characters) {
+ Register offset = current_input_offset();
+ if (cp_offset != 0) {
+ // r25 is not being used to store the capture start index at this point.
+ __ addi(r25, current_input_offset(), Operand(cp_offset * char_size()));
+ offset = r25;
+ }
+ // The lwz, stw, lhz, sth instructions can do unaligned accesses, if the CPU
+ // and the operating system running on the target allow it.
+ // We assume we don't want to do unaligned loads on PPC, so this function
+ // must only be used to load a single character at a time.
+
+ DCHECK(characters == 1);
+ __ add(current_character(), end_of_input_address(), offset);
+ if (mode_ == LATIN1) {
+ __ lbz(current_character(), MemOperand(current_character()));
+ } else {
+ DCHECK(mode_ == UC16);
+ __ lhz(current_character(), MemOperand(current_character()));
+ }
+}
+
+
+#undef __
+
+#endif // V8_INTERPRETED_REGEXP
+} // namespace internal
+} // namespace v8
+
+#endif // V8_TARGET_ARCH_PPC