| // Copyright 2012 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_IA32 |
| |
| #include "src/regexp/ia32/regexp-macro-assembler-ia32.h" |
| |
| #include "src/log.h" |
| #include "src/macro-assembler.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 |
| * - edx : Current character. Must be loaded using LoadCurrentCharacter |
| * before using any of the dispatch methods. Temporarily stores the |
| * index of capture start after a matching pass for a global regexp. |
| * - edi : Current position in input, as negative offset from end of string. |
| * Please notice that this is the byte offset, not the character offset! |
| * - esi : end of input (points to byte after last character in input). |
| * - ebp : Frame pointer. Used to access arguments, local variables and |
| * RegExp registers. |
| * - esp : Points to tip of C stack. |
| * - ecx : Points to tip of backtrack stack |
| * |
| * The registers eax and ebx are free to use for computations. |
| * |
| * Each call to a public method should retain this convention. |
| * The stack will have the following structure: |
| * - Isolate* isolate (address of the current isolate) |
| * - 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) |
| * - capture array size (may fit multiple sets of matches) |
| * - int* capture_array (int[num_saved_registers_], for output). |
| * - end of input (address of end of string) |
| * - start of input (address of first character in string) |
| * - start index (character index of start) |
| * - String* input_string (location of a handle containing the string) |
| * --- frame alignment (if applicable) --- |
| * - return address |
| * ebp-> - old ebp |
| * - backup of caller esi |
| * - backup of caller edi |
| * - backup of caller ebx |
| * - success counter (only for global regexps to count matches). |
| * - Offset of location before start of input (effectively character |
| * string start - 1). Used to initialize capture registers to a |
| * non-position. |
| * - register 0 ebp[-4] (only positions must be stored in the first |
| * - register 1 ebp[-8] num_saved_registers_ registers) |
| * - ... |
| * |
| * 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 starts 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) |
| */ |
| |
| #define __ ACCESS_MASM(masm_) |
| |
| RegExpMacroAssemblerIA32::RegExpMacroAssemblerIA32(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_() { |
| DCHECK_EQ(0, registers_to_save % 2); |
| __ jmp(&entry_label_); // We'll write the entry code later. |
| __ bind(&start_label_); // And then continue from here. |
| } |
| |
| |
| RegExpMacroAssemblerIA32::~RegExpMacroAssemblerIA32() { |
| 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 RegExpMacroAssemblerIA32::stack_limit_slack() { |
| return RegExpStack::kStackLimitSlack; |
| } |
| |
| |
| void RegExpMacroAssemblerIA32::AdvanceCurrentPosition(int by) { |
| if (by != 0) { |
| __ add(edi, Immediate(by * char_size())); |
| } |
| } |
| |
| |
| void RegExpMacroAssemblerIA32::AdvanceRegister(int reg, int by) { |
| DCHECK(reg >= 0); |
| DCHECK(reg < num_registers_); |
| if (by != 0) { |
| __ add(register_location(reg), Immediate(by)); |
| } |
| } |
| |
| |
| void RegExpMacroAssemblerIA32::Backtrack() { |
| CheckPreemption(); |
| // Pop Code* offset from backtrack stack, add Code* and jump to location. |
| Pop(ebx); |
| __ add(ebx, Immediate(masm_->CodeObject())); |
| __ jmp(ebx); |
| } |
| |
| |
| void RegExpMacroAssemblerIA32::Bind(Label* label) { |
| __ bind(label); |
| } |
| |
| |
| void RegExpMacroAssemblerIA32::CheckCharacter(uint32_t c, Label* on_equal) { |
| __ cmp(current_character(), c); |
| BranchOrBacktrack(equal, on_equal); |
| } |
| |
| |
| void RegExpMacroAssemblerIA32::CheckCharacterGT(uc16 limit, Label* on_greater) { |
| __ cmp(current_character(), limit); |
| BranchOrBacktrack(greater, on_greater); |
| } |
| |
| |
| void RegExpMacroAssemblerIA32::CheckAtStart(Label* on_at_start) { |
| __ lea(eax, Operand(edi, -char_size())); |
| __ cmp(eax, Operand(ebp, kStringStartMinusOne)); |
| BranchOrBacktrack(equal, on_at_start); |
| } |
| |
| |
| void RegExpMacroAssemblerIA32::CheckNotAtStart(int cp_offset, |
| Label* on_not_at_start) { |
| __ lea(eax, Operand(edi, -char_size() + cp_offset * char_size())); |
| __ cmp(eax, Operand(ebp, kStringStartMinusOne)); |
| BranchOrBacktrack(not_equal, on_not_at_start); |
| } |
| |
| |
| void RegExpMacroAssemblerIA32::CheckCharacterLT(uc16 limit, Label* on_less) { |
| __ cmp(current_character(), limit); |
| BranchOrBacktrack(less, on_less); |
| } |
| |
| |
| void RegExpMacroAssemblerIA32::CheckGreedyLoop(Label* on_equal) { |
| Label fallthrough; |
| __ cmp(edi, Operand(backtrack_stackpointer(), 0)); |
| __ j(not_equal, &fallthrough); |
| __ add(backtrack_stackpointer(), Immediate(kPointerSize)); // Pop. |
| BranchOrBacktrack(no_condition, on_equal); |
| __ bind(&fallthrough); |
| } |
| |
| |
| void RegExpMacroAssemblerIA32::CheckNotBackReferenceIgnoreCase( |
| int start_reg, bool read_backward, bool unicode, Label* on_no_match) { |
| Label fallthrough; |
| __ mov(edx, register_location(start_reg)); // Index of start of capture |
| __ mov(ebx, register_location(start_reg + 1)); // Index of end of capture |
| __ sub(ebx, edx); // 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. |
| __ j(equal, &fallthrough); |
| |
| // Check that there are sufficient characters left in the input. |
| if (read_backward) { |
| __ mov(eax, Operand(ebp, kStringStartMinusOne)); |
| __ add(eax, ebx); |
| __ cmp(edi, eax); |
| BranchOrBacktrack(less_equal, on_no_match); |
| } else { |
| __ mov(eax, edi); |
| __ add(eax, ebx); |
| BranchOrBacktrack(greater, on_no_match); |
| } |
| |
| if (mode_ == LATIN1) { |
| Label success; |
| Label fail; |
| Label loop_increment; |
| // Save register contents to make the registers available below. |
| __ push(edi); |
| __ push(backtrack_stackpointer()); |
| // After this, the eax, ecx, and edi registers are available. |
| |
| __ add(edx, esi); // Start of capture |
| __ add(edi, esi); // Start of text to match against capture. |
| if (read_backward) { |
| __ sub(edi, ebx); // Offset by length when matching backwards. |
| } |
| __ add(ebx, edi); // End of text to match against capture. |
| |
| Label loop; |
| __ bind(&loop); |
| __ movzx_b(eax, Operand(edi, 0)); |
| __ cmpb_al(Operand(edx, 0)); |
| __ j(equal, &loop_increment); |
| |
| // Mismatch, try case-insensitive match (converting letters to lower-case). |
| __ or_(eax, 0x20); // Convert match character to lower-case. |
| __ lea(ecx, Operand(eax, -'a')); |
| __ cmp(ecx, static_cast<int32_t>('z' - 'a')); // Is eax a lowercase letter? |
| Label convert_capture; |
| __ j(below_equal, &convert_capture); // In range 'a'-'z'. |
| // Latin-1: Check for values in range [224,254] but not 247. |
| __ sub(ecx, Immediate(224 - 'a')); |
| __ cmp(ecx, Immediate(254 - 224)); |
| __ j(above, &fail); // Weren't Latin-1 letters. |
| __ cmp(ecx, Immediate(247 - 224)); // Check for 247. |
| __ j(equal, &fail); |
| __ bind(&convert_capture); |
| // Also convert capture character. |
| __ movzx_b(ecx, Operand(edx, 0)); |
| __ or_(ecx, 0x20); |
| |
| __ cmp(eax, ecx); |
| __ j(not_equal, &fail); |
| |
| __ bind(&loop_increment); |
| // Increment pointers into match and capture strings. |
| __ add(edx, Immediate(1)); |
| __ add(edi, Immediate(1)); |
| // Compare to end of match, and loop if not done. |
| __ cmp(edi, ebx); |
| __ j(below, &loop); |
| __ jmp(&success); |
| |
| __ bind(&fail); |
| // Restore original values before failing. |
| __ pop(backtrack_stackpointer()); |
| __ pop(edi); |
| BranchOrBacktrack(no_condition, on_no_match); |
| |
| __ bind(&success); |
| // Restore original value before continuing. |
| __ pop(backtrack_stackpointer()); |
| // Drop original value of character position. |
| __ add(esp, Immediate(kPointerSize)); |
| // Compute new value of character position after the matched part. |
| __ sub(edi, esi); |
| if (read_backward) { |
| // Subtract match length if we matched backward. |
| __ add(edi, register_location(start_reg)); |
| __ sub(edi, register_location(start_reg + 1)); |
| } |
| } else { |
| DCHECK(mode_ == UC16); |
| // Save registers before calling C function. |
| __ push(esi); |
| __ push(edi); |
| __ push(backtrack_stackpointer()); |
| __ push(ebx); |
| |
| static const int argument_count = 4; |
| __ PrepareCallCFunction(argument_count, ecx); |
| // Put arguments into allocated stack area, last argument highest on stack. |
| // Parameters are |
| // Address byte_offset1 - Address captured substring's start. |
| // Address byte_offset2 - Address of current character position. |
| // size_t byte_length - length of capture in bytes(!) |
| // Isolate* isolate or 0 if unicode flag. |
| |
| // Set isolate. |
| #ifdef V8_I18N_SUPPORT |
| if (unicode) { |
| __ mov(Operand(esp, 3 * kPointerSize), Immediate(0)); |
| } else // NOLINT |
| #endif // V8_I18N_SUPPORT |
| { |
| __ mov(Operand(esp, 3 * kPointerSize), |
| Immediate(ExternalReference::isolate_address(isolate()))); |
| } |
| // Set byte_length. |
| __ mov(Operand(esp, 2 * kPointerSize), ebx); |
| // Set byte_offset2. |
| // Found by adding negative string-end offset of current position (edi) |
| // to end of string. |
| __ add(edi, esi); |
| if (read_backward) { |
| __ sub(edi, ebx); // Offset by length when matching backwards. |
| } |
| __ mov(Operand(esp, 1 * kPointerSize), edi); |
| // Set byte_offset1. |
| // Start of capture, where edx already holds string-end negative offset. |
| __ add(edx, esi); |
| __ mov(Operand(esp, 0 * kPointerSize), edx); |
| |
| { |
| AllowExternalCallThatCantCauseGC scope(masm_); |
| ExternalReference compare = |
| ExternalReference::re_case_insensitive_compare_uc16(isolate()); |
| __ CallCFunction(compare, argument_count); |
| } |
| // Pop original values before reacting on result value. |
| __ pop(ebx); |
| __ pop(backtrack_stackpointer()); |
| __ pop(edi); |
| __ pop(esi); |
| |
| // Check if function returned non-zero for success or zero for failure. |
| __ or_(eax, eax); |
| BranchOrBacktrack(zero, on_no_match); |
| // On success, advance position by length of capture. |
| if (read_backward) { |
| __ sub(edi, ebx); |
| } else { |
| __ add(edi, ebx); |
| } |
| } |
| __ bind(&fallthrough); |
| } |
| |
| |
| void RegExpMacroAssemblerIA32::CheckNotBackReference(int start_reg, |
| bool read_backward, |
| Label* on_no_match) { |
| Label fallthrough; |
| Label success; |
| Label fail; |
| |
| // Find length of back-referenced capture. |
| __ mov(edx, register_location(start_reg)); |
| __ mov(eax, register_location(start_reg + 1)); |
| __ sub(eax, edx); // 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. |
| __ j(equal, &fallthrough); |
| |
| // Check that there are sufficient characters left in the input. |
| if (read_backward) { |
| __ mov(ebx, Operand(ebp, kStringStartMinusOne)); |
| __ add(ebx, eax); |
| __ cmp(edi, ebx); |
| BranchOrBacktrack(less_equal, on_no_match); |
| } else { |
| __ mov(ebx, edi); |
| __ add(ebx, eax); |
| BranchOrBacktrack(greater, on_no_match); |
| } |
| |
| // Save register to make it available below. |
| __ push(backtrack_stackpointer()); |
| |
| // Compute pointers to match string and capture string |
| __ add(edx, esi); // Start of capture. |
| __ lea(ebx, Operand(esi, edi, times_1, 0)); // Start of match. |
| if (read_backward) { |
| __ sub(ebx, eax); // Offset by length when matching backwards. |
| } |
| __ lea(ecx, Operand(eax, ebx, times_1, 0)); // End of match |
| |
| Label loop; |
| __ bind(&loop); |
| if (mode_ == LATIN1) { |
| __ movzx_b(eax, Operand(edx, 0)); |
| __ cmpb_al(Operand(ebx, 0)); |
| } else { |
| DCHECK(mode_ == UC16); |
| __ movzx_w(eax, Operand(edx, 0)); |
| __ cmpw_ax(Operand(ebx, 0)); |
| } |
| __ j(not_equal, &fail); |
| // Increment pointers into capture and match string. |
| __ add(edx, Immediate(char_size())); |
| __ add(ebx, Immediate(char_size())); |
| // Check if we have reached end of match area. |
| __ cmp(ebx, ecx); |
| __ j(below, &loop); |
| __ jmp(&success); |
| |
| __ bind(&fail); |
| // Restore backtrack stackpointer. |
| __ pop(backtrack_stackpointer()); |
| BranchOrBacktrack(no_condition, on_no_match); |
| |
| __ bind(&success); |
| // Move current character position to position after match. |
| __ mov(edi, ecx); |
| __ sub(edi, esi); |
| if (read_backward) { |
| // Subtract match length if we matched backward. |
| __ add(edi, register_location(start_reg)); |
| __ sub(edi, register_location(start_reg + 1)); |
| } |
| // Restore backtrack stackpointer. |
| __ pop(backtrack_stackpointer()); |
| |
| __ bind(&fallthrough); |
| } |
| |
| |
| void RegExpMacroAssemblerIA32::CheckNotCharacter(uint32_t c, |
| Label* on_not_equal) { |
| __ cmp(current_character(), c); |
| BranchOrBacktrack(not_equal, on_not_equal); |
| } |
| |
| |
| void RegExpMacroAssemblerIA32::CheckCharacterAfterAnd(uint32_t c, |
| uint32_t mask, |
| Label* on_equal) { |
| if (c == 0) { |
| __ test(current_character(), Immediate(mask)); |
| } else { |
| __ mov(eax, mask); |
| __ and_(eax, current_character()); |
| __ cmp(eax, c); |
| } |
| BranchOrBacktrack(equal, on_equal); |
| } |
| |
| |
| void RegExpMacroAssemblerIA32::CheckNotCharacterAfterAnd(uint32_t c, |
| uint32_t mask, |
| Label* on_not_equal) { |
| if (c == 0) { |
| __ test(current_character(), Immediate(mask)); |
| } else { |
| __ mov(eax, mask); |
| __ and_(eax, current_character()); |
| __ cmp(eax, c); |
| } |
| BranchOrBacktrack(not_equal, on_not_equal); |
| } |
| |
| |
| void RegExpMacroAssemblerIA32::CheckNotCharacterAfterMinusAnd( |
| uc16 c, |
| uc16 minus, |
| uc16 mask, |
| Label* on_not_equal) { |
| DCHECK(minus < String::kMaxUtf16CodeUnit); |
| __ lea(eax, Operand(current_character(), -minus)); |
| if (c == 0) { |
| __ test(eax, Immediate(mask)); |
| } else { |
| __ and_(eax, mask); |
| __ cmp(eax, c); |
| } |
| BranchOrBacktrack(not_equal, on_not_equal); |
| } |
| |
| |
| void RegExpMacroAssemblerIA32::CheckCharacterInRange( |
| uc16 from, |
| uc16 to, |
| Label* on_in_range) { |
| __ lea(eax, Operand(current_character(), -from)); |
| __ cmp(eax, to - from); |
| BranchOrBacktrack(below_equal, on_in_range); |
| } |
| |
| |
| void RegExpMacroAssemblerIA32::CheckCharacterNotInRange( |
| uc16 from, |
| uc16 to, |
| Label* on_not_in_range) { |
| __ lea(eax, Operand(current_character(), -from)); |
| __ cmp(eax, to - from); |
| BranchOrBacktrack(above, on_not_in_range); |
| } |
| |
| |
| void RegExpMacroAssemblerIA32::CheckBitInTable( |
| Handle<ByteArray> table, |
| Label* on_bit_set) { |
| __ mov(eax, Immediate(table)); |
| Register index = current_character(); |
| if (mode_ != LATIN1 || kTableMask != String::kMaxOneByteCharCode) { |
| __ mov(ebx, kTableSize - 1); |
| __ and_(ebx, current_character()); |
| index = ebx; |
| } |
| __ cmpb(FieldOperand(eax, index, times_1, ByteArray::kHeaderSize), |
| Immediate(0)); |
| BranchOrBacktrack(not_equal, on_bit_set); |
| } |
| |
| |
| bool RegExpMacroAssemblerIA32::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; |
| __ cmp(current_character(), ' '); |
| __ j(equal, &success, Label::kNear); |
| // Check range 0x09..0x0d |
| __ lea(eax, Operand(current_character(), -'\t')); |
| __ cmp(eax, '\r' - '\t'); |
| __ j(below_equal, &success, Label::kNear); |
| // \u00a0 (NBSP). |
| __ cmp(eax, 0x00a0 - '\t'); |
| BranchOrBacktrack(not_equal, 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') |
| __ lea(eax, Operand(current_character(), -'0')); |
| __ cmp(eax, '9' - '0'); |
| BranchOrBacktrack(above, on_no_match); |
| return true; |
| case 'D': |
| // Match non ASCII-digits |
| __ lea(eax, Operand(current_character(), -'0')); |
| __ cmp(eax, '9' - '0'); |
| BranchOrBacktrack(below_equal, on_no_match); |
| return true; |
| case '.': { |
| // Match non-newlines (not 0x0a('\n'), 0x0d('\r'), 0x2028 and 0x2029) |
| __ mov(eax, current_character()); |
| __ xor_(eax, Immediate(0x01)); |
| // See if current character is '\n'^1 or '\r'^1, i.e., 0x0b or 0x0c |
| __ sub(eax, Immediate(0x0b)); |
| __ cmp(eax, 0x0c - 0x0b); |
| BranchOrBacktrack(below_equal, 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(eax, Immediate(0x2028 - 0x0b)); |
| __ cmp(eax, 0x2029 - 0x2028); |
| BranchOrBacktrack(below_equal, on_no_match); |
| } |
| return true; |
| } |
| case 'w': { |
| if (mode_ != LATIN1) { |
| // Table is 256 entries, so all Latin1 characters can be tested. |
| __ cmp(current_character(), Immediate('z')); |
| BranchOrBacktrack(above, on_no_match); |
| } |
| DCHECK_EQ(0, word_character_map[0]); // Character '\0' is not a word char. |
| ExternalReference word_map = ExternalReference::re_word_character_map(); |
| __ test_b(current_character(), |
| Operand::StaticArray(current_character(), times_1, word_map)); |
| BranchOrBacktrack(zero, on_no_match); |
| return true; |
| } |
| case 'W': { |
| Label done; |
| if (mode_ != LATIN1) { |
| // Table is 256 entries, so all Latin1 characters can be tested. |
| __ cmp(current_character(), Immediate('z')); |
| __ j(above, &done); |
| } |
| DCHECK_EQ(0, word_character_map[0]); // Character '\0' is not a word char. |
| ExternalReference word_map = ExternalReference::re_word_character_map(); |
| __ test_b(current_character(), |
| Operand::StaticArray(current_character(), times_1, word_map)); |
| BranchOrBacktrack(not_zero, on_no_match); |
| if (mode_ != LATIN1) { |
| __ bind(&done); |
| } |
| return true; |
| } |
| // Non-standard classes (with no syntactic shorthand) used internally. |
| case '*': |
| // Match any character. |
| return true; |
| case 'n': { |
| // Match newlines (0x0a('\n'), 0x0d('\r'), 0x2028 or 0x2029). |
| // The opposite of '.'. |
| __ mov(eax, current_character()); |
| __ xor_(eax, Immediate(0x01)); |
| // See if current character is '\n'^1 or '\r'^1, i.e., 0x0b or 0x0c |
| __ sub(eax, Immediate(0x0b)); |
| __ cmp(eax, 0x0c - 0x0b); |
| if (mode_ == LATIN1) { |
| BranchOrBacktrack(above, on_no_match); |
| } else { |
| Label done; |
| BranchOrBacktrack(below_equal, &done); |
| DCHECK_EQ(UC16, mode_); |
| // 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(eax, Immediate(0x2028 - 0x0b)); |
| __ cmp(eax, 1); |
| BranchOrBacktrack(above, on_no_match); |
| __ bind(&done); |
| } |
| return true; |
| } |
| // No custom implementation (yet): s(UC16), S(UC16). |
| default: |
| return false; |
| } |
| } |
| |
| |
| void RegExpMacroAssemblerIA32::Fail() { |
| STATIC_ASSERT(FAILURE == 0); // Return value for failure is zero. |
| if (!global()) { |
| __ Move(eax, Immediate(FAILURE)); |
| } |
| __ jmp(&exit_label_); |
| } |
| |
| |
| Handle<HeapObject> RegExpMacroAssemblerIA32::GetCode(Handle<String> source) { |
| Label return_eax; |
| // 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 |
| // code is generated. |
| FrameScope scope(masm_, StackFrame::MANUAL); |
| |
| // Actually emit code to start a new stack frame. |
| __ push(ebp); |
| __ mov(ebp, esp); |
| // Save callee-save registers. Order here should correspond to order of |
| // kBackup_ebx etc. |
| __ push(esi); |
| __ push(edi); |
| __ push(ebx); // Callee-save on MacOS. |
| __ push(Immediate(0)); // Number of successful matches in a global regexp. |
| __ push(Immediate(0)); // 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(ecx, esp); |
| __ sub(ecx, Operand::StaticVariable(stack_limit)); |
| // Handle it if the stack pointer is already below the stack limit. |
| __ j(below_equal, &stack_limit_hit); |
| // Check if there is room for the variable number of registers above |
| // the stack limit. |
| __ cmp(ecx, num_registers_ * kPointerSize); |
| __ j(above_equal, &stack_ok); |
| // Exit with OutOfMemory exception. There is not enough space on the stack |
| // for our working registers. |
| __ mov(eax, EXCEPTION); |
| __ jmp(&return_eax); |
| |
| __ bind(&stack_limit_hit); |
| CallCheckStackGuardState(ebx); |
| __ or_(eax, eax); |
| // If returned value is non-zero, we exit with the returned value as result. |
| __ j(not_zero, &return_eax); |
| |
| __ bind(&stack_ok); |
| // Load start index for later use. |
| __ mov(ebx, Operand(ebp, kStartIndex)); |
| |
| // Allocate space on stack for registers. |
| __ sub(esp, Immediate(num_registers_ * kPointerSize)); |
| // Load string length. |
| __ mov(esi, Operand(ebp, kInputEnd)); |
| // Load input position. |
| __ mov(edi, Operand(ebp, kInputStart)); |
| // Set up edi to be negative offset from string end. |
| __ sub(edi, esi); |
| |
| // Set eax to address of char before start of the string. |
| // (effectively string position -1). |
| __ neg(ebx); |
| if (mode_ == UC16) { |
| __ lea(eax, Operand(edi, ebx, times_2, -char_size())); |
| } else { |
| __ lea(eax, Operand(edi, ebx, times_1, -char_size())); |
| } |
| // Store this value in a local variable, for use when clearing |
| // position registers. |
| __ mov(Operand(ebp, kStringStartMinusOne), eax); |
| |
| #if V8_OS_WIN |
| // Ensure that we write to each stack page, in order. Skipping a page |
| // on Windows can cause segmentation faults. Assuming page size is 4k. |
| const int kPageSize = 4096; |
| const int kRegistersPerPage = kPageSize / kPointerSize; |
| for (int i = num_saved_registers_ + kRegistersPerPage - 1; |
| i < num_registers_; |
| i += kRegistersPerPage) { |
| __ mov(register_location(i), eax); // One write every page. |
| } |
| #endif // V8_OS_WIN |
| |
| Label load_char_start_regexp, start_regexp; |
| // Load newline if index is at start, previous character otherwise. |
| __ cmp(Operand(ebp, kStartIndex), Immediate(0)); |
| __ j(not_equal, &load_char_start_regexp, Label::kNear); |
| __ mov(current_character(), '\n'); |
| __ jmp(&start_regexp, Label::kNear); |
| |
| // 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 |
| // Fill in stack push order, to avoid accessing across an unwritten |
| // page (a problem on Windows). |
| if (num_saved_registers_ > 8) { |
| __ mov(ecx, kRegisterZero); |
| Label init_loop; |
| __ bind(&init_loop); |
| __ mov(Operand(ebp, ecx, times_1, 0), eax); |
| __ sub(ecx, Immediate(kPointerSize)); |
| __ cmp(ecx, kRegisterZero - num_saved_registers_ * kPointerSize); |
| __ j(greater, &init_loop); |
| } else { // Unroll the loop. |
| for (int i = 0; i < num_saved_registers_; i++) { |
| __ mov(register_location(i), eax); |
| } |
| } |
| } |
| |
| // Initialize backtrack stack pointer. |
| __ mov(backtrack_stackpointer(), Operand(ebp, 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 |
| __ mov(ebx, Operand(ebp, kRegisterOutput)); |
| __ mov(ecx, Operand(ebp, kInputEnd)); |
| __ mov(edx, Operand(ebp, kStartIndex)); |
| __ sub(ecx, Operand(ebp, kInputStart)); |
| if (mode_ == UC16) { |
| __ lea(ecx, Operand(ecx, edx, times_2, 0)); |
| } else { |
| __ add(ecx, edx); |
| } |
| for (int i = 0; i < num_saved_registers_; i++) { |
| __ mov(eax, register_location(i)); |
| if (i == 0 && global_with_zero_length_check()) { |
| // Keep capture start in edx for the zero-length check later. |
| __ mov(edx, eax); |
| } |
| // Convert to index from start of string, not end. |
| __ add(eax, ecx); |
| if (mode_ == UC16) { |
| __ sar(eax, 1); // Convert byte index to character index. |
| } |
| __ mov(Operand(ebx, i * kPointerSize), eax); |
| } |
| } |
| |
| if (global()) { |
| // Restart matching if the regular expression is flagged as global. |
| // Increment success counter. |
| __ inc(Operand(ebp, kSuccessfulCaptures)); |
| // Capture results have been stored, so the number of remaining global |
| // output registers is reduced by the number of stored captures. |
| __ mov(ecx, Operand(ebp, kNumOutputRegisters)); |
| __ sub(ecx, Immediate(num_saved_registers_)); |
| // Check whether we have enough room for another set of capture results. |
| __ cmp(ecx, Immediate(num_saved_registers_)); |
| __ j(less, &exit_label_); |
| |
| __ mov(Operand(ebp, kNumOutputRegisters), ecx); |
| // Advance the location for output. |
| __ add(Operand(ebp, kRegisterOutput), |
| Immediate(num_saved_registers_ * kPointerSize)); |
| |
| // Prepare eax to initialize registers with its value in the next run. |
| __ mov(eax, Operand(ebp, kStringStartMinusOne)); |
| |
| if (global_with_zero_length_check()) { |
| // Special case for zero-length matches. |
| // edx: capture start index |
| __ cmp(edi, edx); |
| // Not a zero-length match, restart. |
| __ j(not_equal, &load_char_start_regexp); |
| // edi (offset from the end) is zero if we already reached the end. |
| __ test(edi, edi); |
| __ j(zero, &exit_label_, Label::kNear); |
| // Advance current position after a zero-length match. |
| Label advance; |
| __ bind(&advance); |
| if (mode_ == UC16) { |
| __ add(edi, Immediate(2)); |
| } else { |
| __ inc(edi); |
| } |
| if (global_unicode()) CheckNotInSurrogatePair(0, &advance); |
| } |
| __ jmp(&load_char_start_regexp); |
| } else { |
| __ mov(eax, Immediate(SUCCESS)); |
| } |
| } |
| |
| __ bind(&exit_label_); |
| if (global()) { |
| // Return the number of successful captures. |
| __ mov(eax, Operand(ebp, kSuccessfulCaptures)); |
| } |
| |
| __ bind(&return_eax); |
| // Skip esp past regexp registers. |
| __ lea(esp, Operand(ebp, kBackup_ebx)); |
| // Restore callee-save registers. |
| __ pop(ebx); |
| __ pop(edi); |
| __ pop(esi); |
| // Exit function frame, restore previous one. |
| __ pop(ebp); |
| __ ret(0); |
| |
| // 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_); |
| |
| __ push(backtrack_stackpointer()); |
| __ push(edi); |
| |
| CallCheckStackGuardState(ebx); |
| __ or_(eax, eax); |
| // If returning non-zero, we should end execution with the given |
| // result as return value. |
| __ j(not_zero, &return_eax); |
| |
| __ pop(edi); |
| __ pop(backtrack_stackpointer()); |
| // String might have moved: Reload esi from frame. |
| __ mov(esi, Operand(ebp, 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; |
| // Save registers before calling C function |
| __ push(esi); |
| __ push(edi); |
| |
| // Call GrowStack(backtrack_stackpointer()) |
| static const int num_arguments = 3; |
| __ PrepareCallCFunction(num_arguments, ebx); |
| __ mov(Operand(esp, 2 * kPointerSize), |
| Immediate(ExternalReference::isolate_address(isolate()))); |
| __ lea(eax, Operand(ebp, kStackHighEnd)); |
| __ mov(Operand(esp, 1 * kPointerSize), eax); |
| __ mov(Operand(esp, 0 * kPointerSize), backtrack_stackpointer()); |
| 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. |
| __ or_(eax, eax); |
| __ j(equal, &exit_with_exception); |
| // Otherwise use return value as new stack pointer. |
| __ mov(backtrack_stackpointer(), eax); |
| // Restore saved registers and continue. |
| __ pop(edi); |
| __ pop(esi); |
| 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(eax, EXCEPTION); |
| __ jmp(&return_eax); |
| } |
| |
| 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(AbstractCode::cast(*code), *source)); |
| return Handle<HeapObject>::cast(code); |
| } |
| |
| |
| void RegExpMacroAssemblerIA32::GoTo(Label* to) { |
| BranchOrBacktrack(no_condition, to); |
| } |
| |
| |
| void RegExpMacroAssemblerIA32::IfRegisterGE(int reg, |
| int comparand, |
| Label* if_ge) { |
| __ cmp(register_location(reg), Immediate(comparand)); |
| BranchOrBacktrack(greater_equal, if_ge); |
| } |
| |
| |
| void RegExpMacroAssemblerIA32::IfRegisterLT(int reg, |
| int comparand, |
| Label* if_lt) { |
| __ cmp(register_location(reg), Immediate(comparand)); |
| BranchOrBacktrack(less, if_lt); |
| } |
| |
| |
| void RegExpMacroAssemblerIA32::IfRegisterEqPos(int reg, |
| Label* if_eq) { |
| __ cmp(edi, register_location(reg)); |
| BranchOrBacktrack(equal, if_eq); |
| } |
| |
| |
| RegExpMacroAssembler::IrregexpImplementation |
| RegExpMacroAssemblerIA32::Implementation() { |
| return kIA32Implementation; |
| } |
| |
| |
| void RegExpMacroAssemblerIA32::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 RegExpMacroAssemblerIA32::PopCurrentPosition() { |
| Pop(edi); |
| } |
| |
| |
| void RegExpMacroAssemblerIA32::PopRegister(int register_index) { |
| Pop(eax); |
| __ mov(register_location(register_index), eax); |
| } |
| |
| |
| void RegExpMacroAssemblerIA32::PushBacktrack(Label* label) { |
| Push(Immediate::CodeRelativeOffset(label)); |
| CheckStackLimit(); |
| } |
| |
| |
| void RegExpMacroAssemblerIA32::PushCurrentPosition() { |
| Push(edi); |
| } |
| |
| |
| void RegExpMacroAssemblerIA32::PushRegister(int register_index, |
| StackCheckFlag check_stack_limit) { |
| __ mov(eax, register_location(register_index)); |
| Push(eax); |
| if (check_stack_limit) CheckStackLimit(); |
| } |
| |
| |
| void RegExpMacroAssemblerIA32::ReadCurrentPositionFromRegister(int reg) { |
| __ mov(edi, register_location(reg)); |
| } |
| |
| |
| void RegExpMacroAssemblerIA32::ReadStackPointerFromRegister(int reg) { |
| __ mov(backtrack_stackpointer(), register_location(reg)); |
| __ add(backtrack_stackpointer(), Operand(ebp, kStackHighEnd)); |
| } |
| |
| void RegExpMacroAssemblerIA32::SetCurrentPositionFromEnd(int by) { |
| Label after_position; |
| __ cmp(edi, -by * char_size()); |
| __ j(greater_equal, &after_position, Label::kNear); |
| __ mov(edi, -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 RegExpMacroAssemblerIA32::SetRegister(int register_index, int to) { |
| DCHECK(register_index >= num_saved_registers_); // Reserved for positions! |
| __ mov(register_location(register_index), Immediate(to)); |
| } |
| |
| |
| bool RegExpMacroAssemblerIA32::Succeed() { |
| __ jmp(&success_label_); |
| return global(); |
| } |
| |
| |
| void RegExpMacroAssemblerIA32::WriteCurrentPositionToRegister(int reg, |
| int cp_offset) { |
| if (cp_offset == 0) { |
| __ mov(register_location(reg), edi); |
| } else { |
| __ lea(eax, Operand(edi, cp_offset * char_size())); |
| __ mov(register_location(reg), eax); |
| } |
| } |
| |
| |
| void RegExpMacroAssemblerIA32::ClearRegisters(int reg_from, int reg_to) { |
| DCHECK(reg_from <= reg_to); |
| __ mov(eax, Operand(ebp, kStringStartMinusOne)); |
| for (int reg = reg_from; reg <= reg_to; reg++) { |
| __ mov(register_location(reg), eax); |
| } |
| } |
| |
| |
| void RegExpMacroAssemblerIA32::WriteStackPointerToRegister(int reg) { |
| __ mov(eax, backtrack_stackpointer()); |
| __ sub(eax, Operand(ebp, kStackHighEnd)); |
| __ mov(register_location(reg), eax); |
| } |
| |
| |
| // Private methods: |
| |
| void RegExpMacroAssemblerIA32::CallCheckStackGuardState(Register scratch) { |
| static const int num_arguments = 3; |
| __ PrepareCallCFunction(num_arguments, scratch); |
| // RegExp code frame pointer. |
| __ mov(Operand(esp, 2 * kPointerSize), ebp); |
| // Code* of self. |
| __ mov(Operand(esp, 1 * kPointerSize), Immediate(masm_->CodeObject())); |
| // Next address on the stack (will be address of return address). |
| __ lea(eax, Operand(esp, -kPointerSize)); |
| __ mov(Operand(esp, 0 * kPointerSize), eax); |
| ExternalReference check_stack_guard = |
| ExternalReference::re_check_stack_guard_state(isolate()); |
| __ CallCFunction(check_stack_guard, 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)); |
| } |
| |
| |
| template <typename T> |
| static T* frame_entry_address(Address re_frame, int frame_offset) { |
| return reinterpret_cast<T*>(re_frame + frame_offset); |
| } |
| |
| |
| int RegExpMacroAssemblerIA32::CheckStackGuardState(Address* return_address, |
| Code* re_code, |
| Address re_frame) { |
| return NativeRegExpMacroAssembler::CheckStackGuardState( |
| frame_entry<Isolate*>(re_frame, kIsolate), |
| frame_entry<int>(re_frame, kStartIndex), |
| frame_entry<int>(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)); |
| } |
| |
| |
| Operand RegExpMacroAssemblerIA32::register_location(int register_index) { |
| DCHECK(register_index < (1<<30)); |
| if (num_registers_ <= register_index) { |
| num_registers_ = register_index + 1; |
| } |
| return Operand(ebp, kRegisterZero - register_index * kPointerSize); |
| } |
| |
| |
| void RegExpMacroAssemblerIA32::CheckPosition(int cp_offset, |
| Label* on_outside_input) { |
| if (cp_offset >= 0) { |
| __ cmp(edi, -cp_offset * char_size()); |
| BranchOrBacktrack(greater_equal, on_outside_input); |
| } else { |
| __ lea(eax, Operand(edi, cp_offset * char_size())); |
| __ cmp(eax, Operand(ebp, kStringStartMinusOne)); |
| BranchOrBacktrack(less_equal, on_outside_input); |
| } |
| } |
| |
| |
| void RegExpMacroAssemblerIA32::BranchOrBacktrack(Condition condition, |
| Label* to) { |
| if (condition < 0) { // No condition |
| if (to == NULL) { |
| Backtrack(); |
| return; |
| } |
| __ jmp(to); |
| return; |
| } |
| if (to == NULL) { |
| __ j(condition, &backtrack_label_); |
| return; |
| } |
| __ j(condition, to); |
| } |
| |
| |
| void RegExpMacroAssemblerIA32::SafeCall(Label* to) { |
| Label return_to; |
| __ push(Immediate::CodeRelativeOffset(&return_to)); |
| __ jmp(to); |
| __ bind(&return_to); |
| } |
| |
| |
| void RegExpMacroAssemblerIA32::SafeReturn() { |
| __ pop(ebx); |
| __ add(ebx, Immediate(masm_->CodeObject())); |
| __ jmp(ebx); |
| } |
| |
| |
| void RegExpMacroAssemblerIA32::SafeCallTarget(Label* name) { |
| __ bind(name); |
| } |
| |
| |
| void RegExpMacroAssemblerIA32::Push(Register source) { |
| DCHECK(!source.is(backtrack_stackpointer())); |
| // Notice: This updates flags, unlike normal Push. |
| __ sub(backtrack_stackpointer(), Immediate(kPointerSize)); |
| __ mov(Operand(backtrack_stackpointer(), 0), source); |
| } |
| |
| |
| void RegExpMacroAssemblerIA32::Push(Immediate value) { |
| // Notice: This updates flags, unlike normal Push. |
| __ sub(backtrack_stackpointer(), Immediate(kPointerSize)); |
| __ mov(Operand(backtrack_stackpointer(), 0), value); |
| } |
| |
| |
| void RegExpMacroAssemblerIA32::Pop(Register target) { |
| DCHECK(!target.is(backtrack_stackpointer())); |
| __ mov(target, Operand(backtrack_stackpointer(), 0)); |
| // Notice: This updates flags, unlike normal Pop. |
| __ add(backtrack_stackpointer(), Immediate(kPointerSize)); |
| } |
| |
| |
| void RegExpMacroAssemblerIA32::CheckPreemption() { |
| // Check for preemption. |
| Label no_preempt; |
| ExternalReference stack_limit = |
| ExternalReference::address_of_stack_limit(isolate()); |
| __ cmp(esp, Operand::StaticVariable(stack_limit)); |
| __ j(above, &no_preempt); |
| |
| SafeCall(&check_preempt_label_); |
| |
| __ bind(&no_preempt); |
| } |
| |
| |
| void RegExpMacroAssemblerIA32::CheckStackLimit() { |
| Label no_stack_overflow; |
| ExternalReference stack_limit = |
| ExternalReference::address_of_regexp_stack_limit(isolate()); |
| __ cmp(backtrack_stackpointer(), Operand::StaticVariable(stack_limit)); |
| __ j(above, &no_stack_overflow); |
| |
| SafeCall(&stack_overflow_label_); |
| |
| __ bind(&no_stack_overflow); |
| } |
| |
| |
| void RegExpMacroAssemblerIA32::LoadCurrentCharacterUnchecked(int cp_offset, |
| int characters) { |
| if (mode_ == LATIN1) { |
| if (characters == 4) { |
| __ mov(current_character(), Operand(esi, edi, times_1, cp_offset)); |
| } else if (characters == 2) { |
| __ movzx_w(current_character(), Operand(esi, edi, times_1, cp_offset)); |
| } else { |
| DCHECK(characters == 1); |
| __ movzx_b(current_character(), Operand(esi, edi, times_1, cp_offset)); |
| } |
| } else { |
| DCHECK(mode_ == UC16); |
| if (characters == 2) { |
| __ mov(current_character(), |
| Operand(esi, edi, times_1, cp_offset * sizeof(uc16))); |
| } else { |
| DCHECK(characters == 1); |
| __ movzx_w(current_character(), |
| Operand(esi, edi, times_1, cp_offset * sizeof(uc16))); |
| } |
| } |
| } |
| |
| |
| #undef __ |
| |
| #endif // V8_INTERPRETED_REGEXP |
| |
| } // namespace internal |
| } // namespace v8 |
| |
| #endif // V8_TARGET_ARCH_IA32 |