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Diffstat (limited to 'src/3rdparty/v8/src/arm/regexp-macro-assembler-arm.cc')
| -rw-r--r-- | src/3rdparty/v8/src/arm/regexp-macro-assembler-arm.cc | 1429 |
1 files changed, 0 insertions, 1429 deletions
diff --git a/src/3rdparty/v8/src/arm/regexp-macro-assembler-arm.cc b/src/3rdparty/v8/src/arm/regexp-macro-assembler-arm.cc deleted file mode 100644 index acb24ef..0000000 --- a/src/3rdparty/v8/src/arm/regexp-macro-assembler-arm.cc +++ /dev/null @@ -1,1429 +0,0 @@ -// Copyright 2012 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_ARM) - -#include "unicode.h" -#include "log.h" -#include "code-stubs.h" -#include "regexp-stack.h" -#include "macro-assembler.h" -#include "regexp-macro-assembler.h" -#include "arm/regexp-macro-assembler-arm.h" - -namespace v8 { -namespace internal { - -#ifndef V8_INTERPRETED_REGEXP -/* - * This assembler uses the following register assignment convention - * - r4 : Temporarily stores the index of capture start after a matching pass - * for a global regexp. - * - r5 : Pointer to current code object (Code*) including heap object tag. - * - r6 : Current position in input, as negative offset from end of string. - * Please notice that this is the byte offset, not the character offset! - * - r7 : Currently loaded character. Must be loaded using - * LoadCurrentCharacter before using any of the dispatch methods. - * - r8 : Points to tip of backtrack stack - * - r9 : Unused, might be used by C code and expected unchanged. - * - r10 : End of input (points to byte after last character in input). - * - r11 : Frame pointer. Used to access arguments, local variables and - * RegExp registers. - * - r12 : IP register, used by assembler. Very volatile. - * - r13/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[56] Isolate* isolate (address of the current isolate) - * - fp[52] direct_call (if 1, direct call from JavaScript code, - * if 0, call through the runtime system). - * - fp[48] stack_area_base (high end of the memory area to use as - * backtracking stack). - * - fp[44] capture array size (may fit multiple sets of matches) - * - fp[40] int* capture_array (int[num_saved_registers_], for output). - * - fp[36] secondary link/return address used by native call. - * --- sp when called --- - * - fp[32] return address (lr). - * - fp[28] old frame pointer (r11). - * - fp[0..24] backup of registers r4..r10. - * --- frame pointer ---- - * - fp[-4] end of input (address of end of string). - * - fp[-8] start of input (address of first character in string). - * - fp[-12] start index (character index of start). - * - fp[-16] void* input_string (location of a handle containing the string). - * - fp[-20] success counter (only for global regexps to count matches). - * - fp[-24] Offset of location before start of input (effectively character - * position -1). Used to initialize capture registers to a - * non-position. - * - fp[-28] At start (if 1, we are starting at the start of the - * string, otherwise 0) - * - fp[-32] 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, - * Address secondary_return_address, // Only used by native call. - * int* capture_output_array, - * byte* stack_area_base, - * bool direct_call = false) - * The call is performed by NativeRegExpMacroAssembler::Execute() - * (in regexp-macro-assembler.cc) via the CALL_GENERATED_REGEXP_CODE macro - * in arm/simulator-arm.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_) - -RegExpMacroAssemblerARM::RegExpMacroAssemblerARM( - Mode mode, - int registers_to_save, - Zone* zone) - : NativeRegExpMacroAssembler(zone), - masm_(new MacroAssembler(Isolate::Current(), 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. - EmitBacktrackConstantPool(); - __ bind(&start_label_); // And then continue from here. -} - - -RegExpMacroAssemblerARM::~RegExpMacroAssemblerARM() { - 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 RegExpMacroAssemblerARM::stack_limit_slack() { - return RegExpStack::kStackLimitSlack; -} - - -void RegExpMacroAssemblerARM::AdvanceCurrentPosition(int by) { - if (by != 0) { - __ add(current_input_offset(), - current_input_offset(), Operand(by * char_size())); - } -} - - -void RegExpMacroAssemblerARM::AdvanceRegister(int reg, int by) { - ASSERT(reg >= 0); - ASSERT(reg < num_registers_); - if (by != 0) { - __ ldr(r0, register_location(reg)); - __ add(r0, r0, Operand(by)); - __ str(r0, register_location(reg)); - } -} - - -void RegExpMacroAssemblerARM::Backtrack() { - CheckPreemption(); - // Pop Code* offset from backtrack stack, add Code* and jump to location. - Pop(r0); - __ add(pc, r0, Operand(code_pointer())); -} - - -void RegExpMacroAssemblerARM::Bind(Label* label) { - __ bind(label); -} - - -void RegExpMacroAssemblerARM::CheckCharacter(uint32_t c, Label* on_equal) { - __ cmp(current_character(), Operand(c)); - BranchOrBacktrack(eq, on_equal); -} - - -void RegExpMacroAssemblerARM::CheckCharacterGT(uc16 limit, Label* on_greater) { - __ cmp(current_character(), Operand(limit)); - BranchOrBacktrack(gt, on_greater); -} - - -void RegExpMacroAssemblerARM::CheckAtStart(Label* on_at_start) { - Label not_at_start; - // Did we start the match at the start of the string at all? - __ ldr(r0, MemOperand(frame_pointer(), kStartIndex)); - __ cmp(r0, Operand::Zero()); - BranchOrBacktrack(ne, ¬_at_start); - - // If we did, are we still at the start of the input? - __ ldr(r1, MemOperand(frame_pointer(), kInputStart)); - __ add(r0, end_of_input_address(), Operand(current_input_offset())); - __ cmp(r0, r1); - BranchOrBacktrack(eq, on_at_start); - __ bind(¬_at_start); -} - - -void RegExpMacroAssemblerARM::CheckNotAtStart(Label* on_not_at_start) { - // Did we start the match at the start of the string at all? - __ ldr(r0, MemOperand(frame_pointer(), kStartIndex)); - __ cmp(r0, Operand::Zero()); - BranchOrBacktrack(ne, on_not_at_start); - // If we did, are we still at the start of the input? - __ ldr(r1, MemOperand(frame_pointer(), kInputStart)); - __ add(r0, end_of_input_address(), Operand(current_input_offset())); - __ cmp(r0, r1); - BranchOrBacktrack(ne, on_not_at_start); -} - - -void RegExpMacroAssemblerARM::CheckCharacterLT(uc16 limit, Label* on_less) { - __ cmp(current_character(), Operand(limit)); - BranchOrBacktrack(lt, on_less); -} - - -void RegExpMacroAssemblerARM::CheckCharacters(Vector<const uc16> str, - int cp_offset, - Label* on_failure, - bool check_end_of_string) { - if (on_failure == NULL) { - // Instead of inlining a backtrack for each test, (re)use the global - // backtrack target. - on_failure = &backtrack_label_; - } - - if (check_end_of_string) { - // Is last character of required match inside string. - CheckPosition(cp_offset + str.length() - 1, on_failure); - } - - __ add(r0, end_of_input_address(), Operand(current_input_offset())); - if (cp_offset != 0) { - int byte_offset = cp_offset * char_size(); - __ add(r0, r0, Operand(byte_offset)); - } - - // r0 : Address of characters to match against str. - int stored_high_byte = 0; - for (int i = 0; i < str.length(); i++) { - if (mode_ == ASCII) { - __ ldrb(r1, MemOperand(r0, char_size(), PostIndex)); - ASSERT(str[i] <= String::kMaxOneByteCharCode); - __ cmp(r1, Operand(str[i])); - } else { - __ ldrh(r1, MemOperand(r0, char_size(), PostIndex)); - uc16 match_char = str[i]; - int match_high_byte = (match_char >> 8); - if (match_high_byte == 0) { - __ cmp(r1, Operand(str[i])); - } else { - if (match_high_byte != stored_high_byte) { - __ mov(r2, Operand(match_high_byte)); - stored_high_byte = match_high_byte; - } - __ add(r3, r2, Operand(match_char & 0xff)); - __ cmp(r1, r3); - } - } - BranchOrBacktrack(ne, on_failure); - } -} - - -void RegExpMacroAssemblerARM::CheckGreedyLoop(Label* on_equal) { - __ ldr(r0, MemOperand(backtrack_stackpointer(), 0)); - __ cmp(current_input_offset(), r0); - __ add(backtrack_stackpointer(), - backtrack_stackpointer(), Operand(kPointerSize), LeaveCC, eq); - BranchOrBacktrack(eq, on_equal); -} - - -void RegExpMacroAssemblerARM::CheckNotBackReferenceIgnoreCase( - int start_reg, - Label* on_no_match) { - Label fallthrough; - __ ldr(r0, register_location(start_reg)); // Index of start of capture - __ ldr(r1, register_location(start_reg + 1)); // Index of end of capture - __ sub(r1, r1, r0, SetCC); // Length of capture. - - // If length is zero, either the capture is empty or it is not participating. - // In either case succeed immediately. - __ b(eq, &fallthrough); - - // Check that there are enough characters left in the input. - __ cmn(r1, Operand(current_input_offset())); - BranchOrBacktrack(gt, on_no_match); - - if (mode_ == ASCII) { - Label success; - Label fail; - Label loop_check; - - // r0 - offset of start of capture - // r1 - length of capture - __ add(r0, r0, Operand(end_of_input_address())); - __ add(r2, end_of_input_address(), Operand(current_input_offset())); - __ add(r1, r0, Operand(r1)); - - // r0 - Address of start of capture. - // r1 - Address of end of capture - // r2 - Address of current input position. - - Label loop; - __ bind(&loop); - __ ldrb(r3, MemOperand(r0, char_size(), PostIndex)); - __ ldrb(r4, MemOperand(r2, char_size(), PostIndex)); - __ cmp(r4, r3); - __ b(eq, &loop_check); - - // Mismatch, try case-insensitive match (converting letters to lower-case). - __ orr(r3, r3, Operand(0x20)); // Convert capture character to lower-case. - __ orr(r4, r4, Operand(0x20)); // Also convert input character. - __ cmp(r4, r3); - __ b(ne, &fail); - __ sub(r3, r3, Operand('a')); - __ cmp(r3, Operand('z' - 'a')); // Is r3 a lowercase letter? -#ifndef ENABLE_LATIN_1 - __ b(hi, &fail); -#else - __ b(ls, &loop_check); // In range 'a'-'z'. - // Latin-1: Check for values in range [224,254] but not 247. - __ sub(r3, r3, Operand(224 - 'a')); - __ cmp(r3, Operand(254 - 224)); - __ b(hi, &fail); // Weren't Latin-1 letters. - __ cmp(r3, Operand(247 - 224)); // Check for 247. - __ b(eq, &fail); -#endif - - __ bind(&loop_check); - __ cmp(r0, r1); - __ b(lt, &loop); - __ jmp(&success); - - __ bind(&fail); - BranchOrBacktrack(al, on_no_match); - - __ bind(&success); - // Compute new value of character position after the matched part. - __ sub(current_input_offset(), r2, end_of_input_address()); - } else { - ASSERT(mode_ == UC16); - int argument_count = 4; - __ PrepareCallCFunction(argument_count, r2); - - // r0 - offset of start of capture - // r1 - length of capture - - // Put arguments into arguments registers. - // Parameters are - // r0: Address byte_offset1 - Address captured substring's start. - // r1: Address byte_offset2 - Address of current character position. - // r2: size_t byte_length - length of capture in bytes(!) - // r3: Isolate* isolate - - // Address of start of capture. - __ add(r0, r0, Operand(end_of_input_address())); - // Length of capture. - __ mov(r2, Operand(r1)); - // Save length in callee-save register for use on return. - __ mov(r4, Operand(r1)); - // Address of current input position. - __ add(r1, current_input_offset(), Operand(end_of_input_address())); - // Isolate. - __ mov(r3, Operand(ExternalReference::isolate_address())); - - { - AllowExternalCallThatCantCauseGC scope(masm_); - ExternalReference function = - ExternalReference::re_case_insensitive_compare_uc16(masm_->isolate()); - __ CallCFunction(function, argument_count); - } - - // Check if function returned non-zero for success or zero for failure. - __ cmp(r0, Operand::Zero()); - BranchOrBacktrack(eq, on_no_match); - // On success, increment position by length of capture. - __ add(current_input_offset(), current_input_offset(), Operand(r4)); - } - - __ bind(&fallthrough); -} - - -void RegExpMacroAssemblerARM::CheckNotBackReference( - int start_reg, - Label* on_no_match) { - Label fallthrough; - Label success; - - // Find length of back-referenced capture. - __ ldr(r0, register_location(start_reg)); - __ ldr(r1, register_location(start_reg + 1)); - __ sub(r1, r1, r0, SetCC); // Length to check. - // Succeed on empty capture (including no capture). - __ b(eq, &fallthrough); - - // Check that there are enough characters left in the input. - __ cmn(r1, Operand(current_input_offset())); - BranchOrBacktrack(gt, on_no_match); - - // Compute pointers to match string and capture string - __ add(r0, r0, Operand(end_of_input_address())); - __ add(r2, end_of_input_address(), Operand(current_input_offset())); - __ add(r1, r1, Operand(r0)); - - Label loop; - __ bind(&loop); - if (mode_ == ASCII) { - __ ldrb(r3, MemOperand(r0, char_size(), PostIndex)); - __ ldrb(r4, MemOperand(r2, char_size(), PostIndex)); - } else { - ASSERT(mode_ == UC16); - __ ldrh(r3, MemOperand(r0, char_size(), PostIndex)); - __ ldrh(r4, MemOperand(r2, char_size(), PostIndex)); - } - __ cmp(r3, r4); - BranchOrBacktrack(ne, on_no_match); - __ cmp(r0, r1); - __ b(lt, &loop); - - // Move current character position to position after match. - __ sub(current_input_offset(), r2, end_of_input_address()); - __ bind(&fallthrough); -} - - -void RegExpMacroAssemblerARM::CheckNotCharacter(unsigned c, - Label* on_not_equal) { - __ cmp(current_character(), Operand(c)); - BranchOrBacktrack(ne, on_not_equal); -} - - -void RegExpMacroAssemblerARM::CheckCharacterAfterAnd(uint32_t c, - uint32_t mask, - Label* on_equal) { - if (c == 0) { - __ tst(current_character(), Operand(mask)); - } else { - __ and_(r0, current_character(), Operand(mask)); - __ cmp(r0, Operand(c)); - } - BranchOrBacktrack(eq, on_equal); -} - - -void RegExpMacroAssemblerARM::CheckNotCharacterAfterAnd(unsigned c, - unsigned mask, - Label* on_not_equal) { - if (c == 0) { - __ tst(current_character(), Operand(mask)); - } else { - __ and_(r0, current_character(), Operand(mask)); - __ cmp(r0, Operand(c)); - } - BranchOrBacktrack(ne, on_not_equal); -} - - -void RegExpMacroAssemblerARM::CheckNotCharacterAfterMinusAnd( - uc16 c, - uc16 minus, - uc16 mask, - Label* on_not_equal) { - ASSERT(minus < String::kMaxUtf16CodeUnit); - __ sub(r0, current_character(), Operand(minus)); - __ and_(r0, r0, Operand(mask)); - __ cmp(r0, Operand(c)); - BranchOrBacktrack(ne, on_not_equal); -} - - -void RegExpMacroAssemblerARM::CheckCharacterInRange( - uc16 from, - uc16 to, - Label* on_in_range) { - __ sub(r0, current_character(), Operand(from)); - __ cmp(r0, Operand(to - from)); - BranchOrBacktrack(ls, on_in_range); // Unsigned lower-or-same condition. -} - - -void RegExpMacroAssemblerARM::CheckCharacterNotInRange( - uc16 from, - uc16 to, - Label* on_not_in_range) { - __ sub(r0, current_character(), Operand(from)); - __ cmp(r0, Operand(to - from)); - BranchOrBacktrack(hi, on_not_in_range); // Unsigned higher condition. -} - - -void RegExpMacroAssemblerARM::CheckBitInTable( - Handle<ByteArray> table, - Label* on_bit_set) { - __ mov(r0, Operand(table)); - if (mode_ != ASCII || kTableMask != String::kMaxOneByteCharCode) { - __ and_(r1, current_character(), Operand(kTableSize - 1)); - __ add(r1, r1, Operand(ByteArray::kHeaderSize - kHeapObjectTag)); - } else { - __ add(r1, - current_character(), - Operand(ByteArray::kHeaderSize - kHeapObjectTag)); - } - __ ldrb(r0, MemOperand(r0, r1)); - __ cmp(r0, Operand::Zero()); - BranchOrBacktrack(ne, on_bit_set); -} - - -bool RegExpMacroAssemblerARM::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_ == ASCII) { - // ASCII space characters are '\t'..'\r' and ' '. - Label success; - __ cmp(current_character(), Operand(' ')); - __ b(eq, &success); - // Check range 0x09..0x0d - __ sub(r0, current_character(), Operand('\t')); - __ cmp(r0, Operand('\r' - '\t')); - BranchOrBacktrack(hi, on_no_match); - __ bind(&success); - return true; - } - return false; - case 'S': - // Match non-space characters. - if (mode_ == ASCII) { - // ASCII space characters are '\t'..'\r' and ' '. - __ cmp(current_character(), Operand(' ')); - BranchOrBacktrack(eq, on_no_match); - __ sub(r0, current_character(), Operand('\t')); - __ cmp(r0, Operand('\r' - '\t')); - BranchOrBacktrack(ls, on_no_match); - return true; - } - return false; - case 'd': - // Match ASCII digits ('0'..'9') - __ sub(r0, current_character(), Operand('0')); - __ cmp(current_character(), Operand('9' - '0')); - BranchOrBacktrack(hi, on_no_match); - return true; - case 'D': - // Match non ASCII-digits - __ sub(r0, current_character(), Operand('0')); - __ cmp(r0, Operand('9' - '0')); - BranchOrBacktrack(ls, on_no_match); - return true; - case '.': { - // Match non-newlines (not 0x0a('\n'), 0x0d('\r'), 0x2028 and 0x2029) - __ eor(r0, current_character(), Operand(0x01)); - // See if current character is '\n'^1 or '\r'^1, i.e., 0x0b or 0x0c - __ sub(r0, r0, Operand(0x0b)); - __ cmp(r0, Operand(0x0c - 0x0b)); - BranchOrBacktrack(ls, 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. - __ sub(r0, r0, Operand(0x2028 - 0x0b)); - __ cmp(r0, Operand(1)); - BranchOrBacktrack(ls, on_no_match); - } - return true; - } - case 'n': { - // Match newlines (0x0a('\n'), 0x0d('\r'), 0x2028 and 0x2029) - __ eor(r0, current_character(), Operand(0x01)); - // See if current character is '\n'^1 or '\r'^1, i.e., 0x0b or 0x0c - __ sub(r0, r0, Operand(0x0b)); - __ cmp(r0, Operand(0x0c - 0x0b)); - if (mode_ == ASCII) { - BranchOrBacktrack(hi, on_no_match); - } else { - Label done; - __ b(ls, &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. - __ sub(r0, r0, Operand(0x2028 - 0x0b)); - __ cmp(r0, Operand(1)); - BranchOrBacktrack(hi, on_no_match); - __ bind(&done); - } - return true; - } - case 'w': { - if (mode_ != ASCII) { - // Table is 128 entries, so all ASCII characters can be tested. - __ cmp(current_character(), Operand('z')); - BranchOrBacktrack(hi, on_no_match); - } - ExternalReference map = ExternalReference::re_word_character_map(); - __ mov(r0, Operand(map)); - __ ldrb(r0, MemOperand(r0, current_character())); - __ cmp(r0, Operand::Zero()); - BranchOrBacktrack(eq, on_no_match); - return true; - } - case 'W': { - Label done; - if (mode_ != ASCII) { - // Table is 128 entries, so all ASCII characters can be tested. - __ cmp(current_character(), Operand('z')); - __ b(hi, &done); - } - ExternalReference map = ExternalReference::re_word_character_map(); - __ mov(r0, Operand(map)); - __ ldrb(r0, MemOperand(r0, current_character())); - __ cmp(r0, Operand::Zero()); - BranchOrBacktrack(ne, on_no_match); - if (mode_ != ASCII) { - __ bind(&done); - } - return true; - } - case '*': - // Match any character. - return true; - // No custom implementation (yet): s(UC16), S(UC16). - default: - return false; - } -} - - -void RegExpMacroAssemblerARM::Fail() { - __ mov(r0, Operand(FAILURE)); - __ jmp(&exit_label_); -} - - -Handle<HeapObject> RegExpMacroAssemblerARM::GetCode(Handle<String> source) { - Label return_r0; - // 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); - - // 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 = r4.bit() | r5.bit() | r6.bit() | - r7.bit() | r8.bit() | r9.bit() | r10.bit() | fp.bit(); - RegList argument_registers = r0.bit() | r1.bit() | r2.bit() | r3.bit(); - __ stm(db_w, sp, argument_registers | registers_to_retain | lr.bit()); - // Set frame pointer in space for it if this is not a direct call - // from generated code. - __ add(frame_pointer(), sp, Operand(4 * kPointerSize)); - __ mov(r0, Operand::Zero()); - __ push(r0); // Make room for success counter and initialize it to 0. - __ push(r0); // Make room for "position - 1" constant (value is irrelevant). - // 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(masm_->isolate()); - __ mov(r0, Operand(stack_limit)); - __ ldr(r0, MemOperand(r0)); - __ sub(r0, sp, r0, SetCC); - // Handle it if the stack pointer is already below the stack limit. - __ b(ls, &stack_limit_hit); - // Check if there is room for the variable number of registers above - // the stack limit. - __ cmp(r0, Operand(num_registers_ * kPointerSize)); - __ b(hs, &stack_ok); - // Exit with OutOfMemory exception. There is not enough space on the stack - // for our working registers. - __ mov(r0, Operand(EXCEPTION)); - __ jmp(&return_r0); - - __ bind(&stack_limit_hit); - CallCheckStackGuardState(r0); - __ cmp(r0, Operand::Zero()); - // If returned value is non-zero, we exit with the returned value as result. - __ b(ne, &return_r0); - - __ bind(&stack_ok); - - // Allocate space on stack for registers. - __ sub(sp, sp, Operand(num_registers_ * kPointerSize)); - // Load string end. - __ ldr(end_of_input_address(), MemOperand(frame_pointer(), kInputEnd)); - // Load input start. - __ ldr(r0, MemOperand(frame_pointer(), kInputStart)); - // Find negative length (offset of start relative to end). - __ sub(current_input_offset(), r0, end_of_input_address()); - // Set r0 to address of char before start of the input string - // (effectively string position -1). - __ ldr(r1, MemOperand(frame_pointer(), kStartIndex)); - __ sub(r0, current_input_offset(), Operand(char_size())); - __ sub(r0, r0, Operand(r1, LSL, (mode_ == UC16) ? 1 : 0)); - // Store this value in a local variable, for use when clearing - // position registers. - __ str(r0, MemOperand(frame_pointer(), kInputStartMinusOne)); - - // 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. - __ cmp(r1, Operand::Zero()); - __ b(ne, &load_char_start_regexp); - __ mov(current_character(), Operand('\n'), LeaveCC, eq); - __ jmp(&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) { - // Address of register 0. - __ add(r1, frame_pointer(), Operand(kRegisterZero)); - __ mov(r2, Operand(num_saved_registers_)); - Label init_loop; - __ bind(&init_loop); - __ str(r0, MemOperand(r1, kPointerSize, NegPostIndex)); - __ sub(r2, r2, Operand(1), SetCC); - __ b(ne, &init_loop); - } else { - for (int i = 0; i < num_saved_registers_; i++) { - __ str(r0, register_location(i)); - } - } - } - - // Initialize backtrack stack pointer. - __ ldr(backtrack_stackpointer(), MemOperand(frame_pointer(), kStackHighEnd)); - - __ jmp(&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 - __ ldr(r1, MemOperand(frame_pointer(), kInputStart)); - __ ldr(r0, MemOperand(frame_pointer(), kRegisterOutput)); - __ ldr(r2, MemOperand(frame_pointer(), kStartIndex)); - __ sub(r1, end_of_input_address(), r1); - // r1 is length of input in bytes. - if (mode_ == UC16) { - __ mov(r1, Operand(r1, LSR, 1)); - } - // r1 is length of input in characters. - __ add(r1, r1, Operand(r2)); - // r1 is length of string in characters. - - ASSERT_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) { - __ ldr(r2, register_location(i)); - __ ldr(r3, register_location(i + 1)); - if (i == 0 && global_with_zero_length_check()) { - // Keep capture start in r4 for the zero-length check later. - __ mov(r4, r2); - } - if (mode_ == UC16) { - __ add(r2, r1, Operand(r2, ASR, 1)); - __ add(r3, r1, Operand(r3, ASR, 1)); - } else { - __ add(r2, r1, Operand(r2)); - __ add(r3, r1, Operand(r3)); - } - __ str(r2, MemOperand(r0, kPointerSize, PostIndex)); - __ str(r3, MemOperand(r0, kPointerSize, PostIndex)); - } - } - - if (global()) { - // Restart matching if the regular expression is flagged as global. - __ ldr(r0, MemOperand(frame_pointer(), kSuccessfulCaptures)); - __ ldr(r1, MemOperand(frame_pointer(), kNumOutputRegisters)); - __ ldr(r2, MemOperand(frame_pointer(), kRegisterOutput)); - // Increment success counter. - __ add(r0, r0, Operand(1)); - __ str(r0, 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. - __ sub(r1, r1, Operand(num_saved_registers_)); - // Check whether we have enough room for another set of capture results. - __ cmp(r1, Operand(num_saved_registers_)); - __ b(lt, &return_r0); - - __ str(r1, MemOperand(frame_pointer(), kNumOutputRegisters)); - // Advance the location for output. - __ add(r2, r2, Operand(num_saved_registers_ * kPointerSize)); - __ str(r2, MemOperand(frame_pointer(), kRegisterOutput)); - - // Prepare r0 to initialize registers with its value in the next run. - __ ldr(r0, MemOperand(frame_pointer(), kInputStartMinusOne)); - - if (global_with_zero_length_check()) { - // Special case for zero-length matches. - // r4: capture start index - __ cmp(current_input_offset(), r4); - // Not a zero-length match, restart. - __ b(ne, &load_char_start_regexp); - // Offset from the end is zero if we already reached the end. - __ cmp(current_input_offset(), Operand::Zero()); - __ b(eq, &exit_label_); - // Advance current position after a zero-length match. - __ add(current_input_offset(), - current_input_offset(), - Operand((mode_ == UC16) ? 2 : 1)); - } - - __ b(&load_char_start_regexp); - } else { - __ mov(r0, Operand(SUCCESS)); - } - } - - // Exit and return r0 - __ bind(&exit_label_); - if (global()) { - __ ldr(r0, MemOperand(frame_pointer(), kSuccessfulCaptures)); - } - - __ bind(&return_r0); - // Skip sp past regexp registers and local variables.. - __ mov(sp, frame_pointer()); - // Restore registers r4..r11 and return (restoring lr to pc). - __ ldm(ia_w, sp, registers_to_retain | pc.bit()); - - // 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(r0); - __ cmp(r0, Operand::Zero()); - // If returning non-zero, we should end execution with the given - // result as return value. - __ b(ne, &return_r0); - - // String might have moved: Reload end of string from frame. - __ ldr(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, r0); - __ mov(r0, backtrack_stackpointer()); - __ add(r1, frame_pointer(), Operand(kStackHighEnd)); - __ mov(r2, Operand(ExternalReference::isolate_address())); - ExternalReference grow_stack = - ExternalReference::re_grow_stack(masm_->isolate()); - __ CallCFunction(grow_stack, num_arguments); - // If return NULL, we have failed to grow the stack, and - // must exit with a stack-overflow exception. - __ cmp(r0, Operand::Zero()); - __ b(eq, &exit_with_exception); - // Otherwise use return value as new stack pointer. - __ mov(backtrack_stackpointer(), r0); - // 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. - __ mov(r0, Operand(EXCEPTION)); - __ jmp(&return_r0); - } - - CodeDesc code_desc; - masm_->GetCode(&code_desc); - Handle<Code> code = FACTORY->NewCode(code_desc, - Code::ComputeFlags(Code::REGEXP), - masm_->CodeObject()); - PROFILE(Isolate::Current(), RegExpCodeCreateEvent(*code, *source)); - return Handle<HeapObject>::cast(code); -} - - -void RegExpMacroAssemblerARM::GoTo(Label* to) { - BranchOrBacktrack(al, to); -} - - -void RegExpMacroAssemblerARM::IfRegisterGE(int reg, - int comparand, - Label* if_ge) { - __ ldr(r0, register_location(reg)); - __ cmp(r0, Operand(comparand)); - BranchOrBacktrack(ge, if_ge); -} - - -void RegExpMacroAssemblerARM::IfRegisterLT(int reg, - int comparand, - Label* if_lt) { - __ ldr(r0, register_location(reg)); - __ cmp(r0, Operand(comparand)); - BranchOrBacktrack(lt, if_lt); -} - - -void RegExpMacroAssemblerARM::IfRegisterEqPos(int reg, - Label* if_eq) { - __ ldr(r0, register_location(reg)); - __ cmp(r0, Operand(current_input_offset())); - BranchOrBacktrack(eq, if_eq); -} - - -RegExpMacroAssembler::IrregexpImplementation - RegExpMacroAssemblerARM::Implementation() { - return kARMImplementation; -} - - -void RegExpMacroAssemblerARM::LoadCurrentCharacter(int cp_offset, - Label* on_end_of_input, - bool check_bounds, - int characters) { - ASSERT(cp_offset >= -1); // ^ and \b can look behind one character. - ASSERT(cp_offset < (1<<30)); // Be sane! (And ensure negation works) - if (check_bounds) { - CheckPosition(cp_offset + characters - 1, on_end_of_input); - } - LoadCurrentCharacterUnchecked(cp_offset, characters); -} - - -void RegExpMacroAssemblerARM::PopCurrentPosition() { - Pop(current_input_offset()); -} - - -void RegExpMacroAssemblerARM::PopRegister(int register_index) { - Pop(r0); - __ str(r0, register_location(register_index)); -} - - -static bool is_valid_memory_offset(int value) { - if (value < 0) value = -value; - return value < (1<<12); -} - - -void RegExpMacroAssemblerARM::PushBacktrack(Label* label) { - if (label->is_bound()) { - int target = label->pos(); - __ mov(r0, Operand(target + Code::kHeaderSize - kHeapObjectTag)); - } else { - int constant_offset = GetBacktrackConstantPoolEntry(); - masm_->label_at_put(label, constant_offset); - // Reading pc-relative is based on the address 8 bytes ahead of - // the current opcode. - unsigned int offset_of_pc_register_read = - masm_->pc_offset() + Assembler::kPcLoadDelta; - int pc_offset_of_constant = - constant_offset - offset_of_pc_register_read; - ASSERT(pc_offset_of_constant < 0); - if (is_valid_memory_offset(pc_offset_of_constant)) { - Assembler::BlockConstPoolScope block_const_pool(masm_); - __ ldr(r0, MemOperand(pc, pc_offset_of_constant)); - } else { - // Not a 12-bit offset, so it needs to be loaded from the constant - // pool. - Assembler::BlockConstPoolScope block_const_pool(masm_); - __ mov(r0, Operand(pc_offset_of_constant + Assembler::kInstrSize)); - __ ldr(r0, MemOperand(pc, r0)); - } - } - Push(r0); - CheckStackLimit(); -} - - -void RegExpMacroAssemblerARM::PushCurrentPosition() { - Push(current_input_offset()); -} - - -void RegExpMacroAssemblerARM::PushRegister(int register_index, - StackCheckFlag check_stack_limit) { - __ ldr(r0, register_location(register_index)); - Push(r0); - if (check_stack_limit) CheckStackLimit(); -} - - -void RegExpMacroAssemblerARM::ReadCurrentPositionFromRegister(int reg) { - __ ldr(current_input_offset(), register_location(reg)); -} - - -void RegExpMacroAssemblerARM::ReadStackPointerFromRegister(int reg) { - __ ldr(backtrack_stackpointer(), register_location(reg)); - __ ldr(r0, MemOperand(frame_pointer(), kStackHighEnd)); - __ add(backtrack_stackpointer(), backtrack_stackpointer(), Operand(r0)); -} - - -void RegExpMacroAssemblerARM::SetCurrentPositionFromEnd(int by) { - Label after_position; - __ cmp(current_input_offset(), Operand(-by * char_size())); - __ b(ge, &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 RegExpMacroAssemblerARM::SetRegister(int register_index, int to) { - ASSERT(register_index >= num_saved_registers_); // Reserved for positions! - __ mov(r0, Operand(to)); - __ str(r0, register_location(register_index)); -} - - -bool RegExpMacroAssemblerARM::Succeed() { - __ jmp(&success_label_); - return global(); -} - - -void RegExpMacroAssemblerARM::WriteCurrentPositionToRegister(int reg, - int cp_offset) { - if (cp_offset == 0) { - __ str(current_input_offset(), register_location(reg)); - } else { - __ add(r0, current_input_offset(), Operand(cp_offset * char_size())); - __ str(r0, register_location(reg)); - } -} - - -void RegExpMacroAssemblerARM::ClearRegisters(int reg_from, int reg_to) { - ASSERT(reg_from <= reg_to); - __ ldr(r0, MemOperand(frame_pointer(), kInputStartMinusOne)); - for (int reg = reg_from; reg <= reg_to; reg++) { - __ str(r0, register_location(reg)); - } -} - - -void RegExpMacroAssemblerARM::WriteStackPointerToRegister(int reg) { - __ ldr(r1, MemOperand(frame_pointer(), kStackHighEnd)); - __ sub(r0, backtrack_stackpointer(), r1); - __ str(r0, register_location(reg)); -} - - -// Private methods: - -void RegExpMacroAssemblerARM::CallCheckStackGuardState(Register scratch) { - static const int num_arguments = 3; - __ PrepareCallCFunction(num_arguments, scratch); - // RegExp code frame pointer. - __ mov(r2, frame_pointer()); - // Code* of self. - __ mov(r1, Operand(masm_->CodeObject())); - // r0 becomes return address pointer. - ExternalReference stack_guard_check = - ExternalReference::re_check_stack_guard_state(masm_->isolate()); - CallCFunctionUsingStub(stack_guard_check, num_arguments); -} - - -// 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 RegExpMacroAssemblerARM::CheckStackGuardState(Address* return_address, - Code* re_code, - Address re_frame) { - Isolate* isolate = frame_entry<Isolate*>(re_frame, kIsolate); - ASSERT(isolate == Isolate::Current()); - if (isolate->stack_guard()->IsStackOverflow()) { - isolate->StackOverflow(); - return EXCEPTION; - } - - // If not real stack overflow the stack guard was used to interrupt - // execution for another purpose. - - // If this is a direct call from JavaScript retry the RegExp forcing the call - // through the runtime system. Currently the direct call cannot handle a GC. - if (frame_entry<int>(re_frame, kDirectCall) == 1) { - return RETRY; - } - - // Prepare for possible GC. - HandleScope handles(isolate); - Handle<Code> code_handle(re_code); - - Handle<String> subject(frame_entry<String*>(re_frame, kInputString)); - - // Current string. - bool is_ascii = subject->IsOneByteRepresentationUnderneath(); - - ASSERT(re_code->instruction_start() <= *return_address); - ASSERT(*return_address <= - re_code->instruction_start() + re_code->instruction_size()); - - MaybeObject* result = Execution::HandleStackGuardInterrupt(isolate); - - if (*code_handle != re_code) { // Return address no longer valid - int delta = code_handle->address() - re_code->address(); - // Overwrite the return address on the stack. - *return_address += delta; - } - - if (result->IsException()) { - return EXCEPTION; - } - - Handle<String> subject_tmp = subject; - int slice_offset = 0; - - // Extract the underlying string and the slice offset. - if (StringShape(*subject_tmp).IsCons()) { - subject_tmp = Handle<String>(ConsString::cast(*subject_tmp)->first()); - } else if (StringShape(*subject_tmp).IsSliced()) { - SlicedString* slice = SlicedString::cast(*subject_tmp); - subject_tmp = Handle<String>(slice->parent()); - slice_offset = slice->offset(); - } - - // String might have changed. - if (subject_tmp->IsOneByteRepresentation() != is_ascii) { - // If we changed between an ASCII and an UC16 string, the specialized - // code cannot be used, and we need to restart regexp matching from - // scratch (including, potentially, compiling a new version of the code). - return RETRY; - } - - // Otherwise, the content of the string might have moved. It must still - // be a sequential or external string with the same content. - // Update the start and end pointers in the stack frame to the current - // location (whether it has actually moved or not). - ASSERT(StringShape(*subject_tmp).IsSequential() || - StringShape(*subject_tmp).IsExternal()); - - // The original start address of the characters to match. - const byte* start_address = frame_entry<const byte*>(re_frame, kInputStart); - - // Find the current start address of the same character at the current string - // position. - int start_index = frame_entry<int>(re_frame, kStartIndex); - const byte* new_address = StringCharacterPosition(*subject_tmp, - start_index + slice_offset); - - if (start_address != new_address) { - // If there is a difference, update the object pointer and start and end - // addresses in the RegExp stack frame to match the new value. - const byte* end_address = frame_entry<const byte* >(re_frame, kInputEnd); - int byte_length = static_cast<int>(end_address - start_address); - frame_entry<const String*>(re_frame, kInputString) = *subject; - frame_entry<const byte*>(re_frame, kInputStart) = new_address; - frame_entry<const byte*>(re_frame, kInputEnd) = new_address + byte_length; - } else if (frame_entry<const String*>(re_frame, kInputString) != *subject) { - // Subject string might have been a ConsString that underwent - // short-circuiting during GC. That will not change start_address but - // will change pointer inside the subject handle. - frame_entry<const String*>(re_frame, kInputString) = *subject; - } - - return 0; -} - - -MemOperand RegExpMacroAssemblerARM::register_location(int register_index) { - ASSERT(register_index < (1<<30)); - if (num_registers_ <= register_index) { - num_registers_ = register_index + 1; - } - return MemOperand(frame_pointer(), - kRegisterZero - register_index * kPointerSize); -} - - -void RegExpMacroAssemblerARM::CheckPosition(int cp_offset, - Label* on_outside_input) { - __ cmp(current_input_offset(), Operand(-cp_offset * char_size())); - BranchOrBacktrack(ge, on_outside_input); -} - - -void RegExpMacroAssemblerARM::BranchOrBacktrack(Condition condition, - Label* to) { - if (condition == al) { // Unconditional. - if (to == NULL) { - Backtrack(); - return; - } - __ jmp(to); - return; - } - if (to == NULL) { - __ b(condition, &backtrack_label_); - return; - } - __ b(condition, to); -} - - -void RegExpMacroAssemblerARM::SafeCall(Label* to, Condition cond) { - __ bl(to, cond); -} - - -void RegExpMacroAssemblerARM::SafeReturn() { - __ pop(lr); - __ add(pc, lr, Operand(masm_->CodeObject())); -} - - -void RegExpMacroAssemblerARM::SafeCallTarget(Label* name) { - __ bind(name); - __ sub(lr, lr, Operand(masm_->CodeObject())); - __ push(lr); -} - - -void RegExpMacroAssemblerARM::Push(Register source) { - ASSERT(!source.is(backtrack_stackpointer())); - __ str(source, - MemOperand(backtrack_stackpointer(), kPointerSize, NegPreIndex)); -} - - -void RegExpMacroAssemblerARM::Pop(Register target) { - ASSERT(!target.is(backtrack_stackpointer())); - __ ldr(target, - MemOperand(backtrack_stackpointer(), kPointerSize, PostIndex)); -} - - -void RegExpMacroAssemblerARM::CheckPreemption() { - // Check for preemption. - ExternalReference stack_limit = - ExternalReference::address_of_stack_limit(masm_->isolate()); - __ mov(r0, Operand(stack_limit)); - __ ldr(r0, MemOperand(r0)); - __ cmp(sp, r0); - SafeCall(&check_preempt_label_, ls); -} - - -void RegExpMacroAssemblerARM::CheckStackLimit() { - ExternalReference stack_limit = - ExternalReference::address_of_regexp_stack_limit(masm_->isolate()); - __ mov(r0, Operand(stack_limit)); - __ ldr(r0, MemOperand(r0)); - __ cmp(backtrack_stackpointer(), Operand(r0)); - SafeCall(&stack_overflow_label_, ls); -} - - -void RegExpMacroAssemblerARM::EmitBacktrackConstantPool() { - __ CheckConstPool(false, false); - Assembler::BlockConstPoolScope block_const_pool(masm_); - backtrack_constant_pool_offset_ = masm_->pc_offset(); - for (int i = 0; i < kBacktrackConstantPoolSize; i++) { - __ emit(0); - } - - backtrack_constant_pool_capacity_ = kBacktrackConstantPoolSize; -} - - -int RegExpMacroAssemblerARM::GetBacktrackConstantPoolEntry() { - while (backtrack_constant_pool_capacity_ > 0) { - int offset = backtrack_constant_pool_offset_; - backtrack_constant_pool_offset_ += kPointerSize; - backtrack_constant_pool_capacity_--; - if (masm_->pc_offset() - offset < 2 * KB) { - return offset; - } - } - Label new_pool_skip; - __ jmp(&new_pool_skip); - EmitBacktrackConstantPool(); - __ bind(&new_pool_skip); - int offset = backtrack_constant_pool_offset_; - backtrack_constant_pool_offset_ += kPointerSize; - backtrack_constant_pool_capacity_--; - return offset; -} - - -void RegExpMacroAssemblerARM::CallCFunctionUsingStub( - ExternalReference function, - int num_arguments) { - // Must pass all arguments in registers. The stub pushes on the stack. - ASSERT(num_arguments <= 4); - __ mov(code_pointer(), Operand(function)); - RegExpCEntryStub stub; - __ CallStub(&stub); - if (OS::ActivationFrameAlignment() != 0) { - __ ldr(sp, MemOperand(sp, 0)); - } - __ mov(code_pointer(), Operand(masm_->CodeObject())); -} - - -bool RegExpMacroAssemblerARM::CanReadUnaligned() { - return CpuFeatures::IsSupported(UNALIGNED_ACCESSES) && !slow_safe(); -} - - -void RegExpMacroAssemblerARM::LoadCurrentCharacterUnchecked(int cp_offset, - int characters) { - Register offset = current_input_offset(); - if (cp_offset != 0) { - // r4 is not being used to store the capture start index at this point. - __ add(r4, current_input_offset(), Operand(cp_offset * char_size())); - offset = r4; - } - // The ldr, str, ldrh, strh instructions can do unaligned accesses, if the CPU - // and the operating system running on the target allow it. - // If unaligned load/stores are not supported then this function must only - // be used to load a single character at a time. - if (!CanReadUnaligned()) { - ASSERT(characters == 1); - } - - if (mode_ == ASCII) { - if (characters == 4) { - __ ldr(current_character(), MemOperand(end_of_input_address(), offset)); - } else if (characters == 2) { - __ ldrh(current_character(), MemOperand(end_of_input_address(), offset)); - } else { - ASSERT(characters == 1); - __ ldrb(current_character(), MemOperand(end_of_input_address(), offset)); - } - } else { - ASSERT(mode_ == UC16); - if (characters == 2) { - __ ldr(current_character(), MemOperand(end_of_input_address(), offset)); - } else { - ASSERT(characters == 1); - __ ldrh(current_character(), MemOperand(end_of_input_address(), offset)); - } - } -} - - -void RegExpCEntryStub::Generate(MacroAssembler* masm_) { - int stack_alignment = OS::ActivationFrameAlignment(); - if (stack_alignment < kPointerSize) stack_alignment = kPointerSize; - // Stack is already aligned for call, so decrement by alignment - // to make room for storing the link register. - __ str(lr, MemOperand(sp, stack_alignment, NegPreIndex)); - __ mov(r0, sp); - __ Call(r5); - __ ldr(pc, MemOperand(sp, stack_alignment, PostIndex)); -} - -#undef __ - -#endif // V8_INTERPRETED_REGEXP - -}} // namespace v8::internal - -#endif // V8_TARGET_ARCH_ARM |