| // Copyright 2008-2009 the V8 project authors. All rights reserved. |
| // Redistribution and use in source and binary forms, with or without |
| // modification, are permitted provided that the following conditions are |
| // met: |
| // |
| // * Redistributions of source code must retain the above copyright |
| // notice, this list of conditions and the following disclaimer. |
| // * Redistributions in binary form must reproduce the above |
| // copyright notice, this list of conditions and the following |
| // disclaimer in the documentation and/or other materials provided |
| // with the distribution. |
| // * Neither the name of Google Inc. nor the names of its |
| // contributors may be used to endorse or promote products derived |
| // from this software without specific prior written permission. |
| // |
| // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| |
| #include "v8.h" |
| #include "unicode.h" |
| #include "log.h" |
| #include "ast.h" |
| #include "regexp-stack.h" |
| #include "macro-assembler.h" |
| #include "regexp-macro-assembler.h" |
| #include "ia32/macro-assembler-ia32.h" |
| #include "ia32/regexp-macro-assembler-ia32.h" |
| |
| namespace v8 { |
| namespace internal { |
| |
| #ifdef V8_NATIVE_REGEXP |
| /* |
| * This assembler uses the following register assignment convention |
| * - edx : current character. Must be loaded using LoadCurrentCharacter |
| * before using any of the dispatch methods. |
| * - 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, ebx and ecx are free to use for computations. |
| * |
| * Each call to a public method should retain this convention. |
| * The stack will have the following structure: |
| * - direct_call (if 1, direct call from JavaScript code, if 0 |
| * call through the runtime system) |
| * - stack_area_base (High end of the memory area to use as |
| * backtracking stack) |
| * - int* capture_array (int[num_saved_registers_], for output). |
| * - 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 |
| * - Offset of location before start of input (effectively character |
| * position -1). Used to initialize capture registers to a non-position. |
| * - Boolean at start (if 1, we are starting at the start of the string, |
| * otherwise 0) |
| * - 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( |
| Mode mode, |
| int registers_to_save) |
| : masm_(new MacroAssembler(NULL, kRegExpCodeSize)), |
| mode_(mode), |
| num_registers_(registers_to_save), |
| num_saved_registers_(registers_to_save), |
| entry_label_(), |
| start_label_(), |
| success_label_(), |
| backtrack_label_(), |
| exit_label_() { |
| ASSERT_EQ(0, registers_to_save % 2); |
| __ jmp(&entry_label_); // We'll write the entry code later. |
| __ bind(&start_label_); // And then continue from here. |
| } |
| |
| |
| 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) { |
| Label inside_string; |
| __ add(Operand(edi), Immediate(by * char_size())); |
| } |
| } |
| |
| |
| void RegExpMacroAssemblerIA32::AdvanceRegister(int reg, int by) { |
| ASSERT(reg >= 0); |
| ASSERT(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(Operand(ebx), Immediate(masm_->CodeObject())); |
| __ jmp(Operand(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) { |
| Label not_at_start; |
| // Did we start the match at the start of the string at all? |
| __ cmp(Operand(ebp, kAtStart), Immediate(0)); |
| BranchOrBacktrack(equal, ¬_at_start); |
| // If we did, are we still at the start of the input? |
| __ lea(eax, Operand(esi, edi, times_1, 0)); |
| __ cmp(eax, Operand(ebp, kInputStart)); |
| BranchOrBacktrack(equal, on_at_start); |
| __ bind(¬_at_start); |
| } |
| |
| |
| void RegExpMacroAssemblerIA32::CheckNotAtStart(Label* on_not_at_start) { |
| // Did we start the match at the start of the string at all? |
| __ cmp(Operand(ebp, kAtStart), Immediate(0)); |
| BranchOrBacktrack(equal, on_not_at_start); |
| // If we did, are we still at the start of the input? |
| __ lea(eax, Operand(esi, edi, times_1, 0)); |
| __ cmp(eax, Operand(ebp, kInputStart)); |
| 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::CheckCharacters(Vector<const uc16> str, |
| int cp_offset, |
| Label* on_failure, |
| bool check_end_of_string) { |
| int byte_length = str.length() * char_size(); |
| int byte_offset = cp_offset * char_size(); |
| if (check_end_of_string) { |
| // Check that there are at least str.length() characters left in the input. |
| __ cmp(Operand(edi), Immediate(-(byte_offset + byte_length))); |
| BranchOrBacktrack(greater, on_failure); |
| } |
| |
| if (on_failure == NULL) { |
| // Instead of inlining a backtrack, (re)use the global backtrack target. |
| on_failure = &backtrack_label_; |
| } |
| |
| for (int i = 0; i < str.length(); i++) { |
| if (mode_ == ASCII) { |
| __ cmpb(Operand(esi, edi, times_1, byte_offset + i), |
| static_cast<int8_t>(str[i])); |
| } else { |
| ASSERT(mode_ == UC16); |
| __ cmpw(Operand(esi, edi, times_1, byte_offset + i * sizeof(uc16)), |
| Immediate(str[i])); |
| } |
| BranchOrBacktrack(not_equal, on_failure); |
| } |
| } |
| |
| |
| void RegExpMacroAssemblerIA32::CheckGreedyLoop(Label* on_equal) { |
| Label fallthrough; |
| __ cmp(edi, Operand(backtrack_stackpointer(), 0)); |
| __ j(not_equal, &fallthrough); |
| __ add(Operand(backtrack_stackpointer()), Immediate(kPointerSize)); // Pop. |
| BranchOrBacktrack(no_condition, on_equal); |
| __ bind(&fallthrough); |
| } |
| |
| |
| void RegExpMacroAssemblerIA32::CheckNotBackReferenceIgnoreCase( |
| int start_reg, |
| 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, Operand(edx)); // Length of capture. |
| |
| // The length of a capture should not be negative. This can only happen |
| // if the end of the capture is unrecorded, or at a point earlier than |
| // the start of the capture. |
| BranchOrBacktrack(less, on_no_match, not_taken); |
| |
| // If length is zero, either the capture is empty or it is completely |
| // uncaptured. In either case succeed immediately. |
| __ j(equal, &fallthrough); |
| |
| if (mode_ == ASCII) { |
| 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, Operand(esi)); // Start of capture |
| __ add(edi, Operand(esi)); // Start of text to match against capture. |
| __ add(ebx, Operand(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? |
| __ j(above, &fail); |
| // Also convert capture character. |
| __ movzx_b(ecx, Operand(edx, 0)); |
| __ or_(ecx, 0x20); |
| |
| __ cmp(eax, Operand(ecx)); |
| __ j(not_equal, &fail); |
| |
| __ bind(&loop_increment); |
| // Increment pointers into match and capture strings. |
| __ add(Operand(edx), Immediate(1)); |
| __ add(Operand(edi), Immediate(1)); |
| // Compare to end of match, and loop if not done. |
| __ cmp(edi, Operand(ebx)); |
| __ j(below, &loop, taken); |
| __ 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(Operand(esp), Immediate(kPointerSize)); |
| // Compute new value of character position after the matched part. |
| __ sub(edi, Operand(esi)); |
| } else { |
| ASSERT(mode_ == UC16); |
| // Save registers before calling C function. |
| __ push(esi); |
| __ push(edi); |
| __ push(backtrack_stackpointer()); |
| __ push(ebx); |
| |
| const int argument_count = 3; |
| FrameAlign(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(!) |
| |
| // 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, Operand(esi)); |
| __ mov(Operand(esp, 1 * kPointerSize), edi); |
| // Set byte_offset1. |
| // Start of capture, where edx already holds string-end negative offset. |
| __ add(edx, Operand(esi)); |
| __ mov(Operand(esp, 0 * kPointerSize), edx); |
| |
| ExternalReference compare = |
| ExternalReference::re_case_insensitive_compare_uc16(); |
| 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, Operand(eax)); |
| BranchOrBacktrack(zero, on_no_match); |
| // On success, increment position by length of capture. |
| __ add(edi, Operand(ebx)); |
| } |
| __ bind(&fallthrough); |
| } |
| |
| |
| void RegExpMacroAssemblerIA32::CheckNotBackReference( |
| int start_reg, |
| 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, Operand(edx)); // Length to check. |
| // Fail on partial or illegal capture (start of capture after end of capture). |
| BranchOrBacktrack(less, on_no_match); |
| // Succeed on empty capture (including no capture) |
| __ j(equal, &fallthrough); |
| |
| // Check that there are sufficient characters left in the input. |
| __ mov(ebx, edi); |
| __ add(ebx, Operand(eax)); |
| BranchOrBacktrack(greater, on_no_match); |
| |
| // Save register to make it available below. |
| __ push(backtrack_stackpointer()); |
| |
| // Compute pointers to match string and capture string |
| __ lea(ebx, Operand(esi, edi, times_1, 0)); // Start of match. |
| __ add(edx, Operand(esi)); // Start of capture. |
| __ lea(ecx, Operand(eax, ebx, times_1, 0)); // End of match |
| |
| Label loop; |
| __ bind(&loop); |
| if (mode_ == ASCII) { |
| __ movzx_b(eax, Operand(edx, 0)); |
| __ cmpb_al(Operand(ebx, 0)); |
| } else { |
| ASSERT(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(Operand(edx), Immediate(char_size())); |
| __ add(Operand(ebx), Immediate(char_size())); |
| // Check if we have reached end of match area. |
| __ cmp(ebx, Operand(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(Operand(edi), esi); |
| // Restore backtrack stackpointer. |
| __ pop(backtrack_stackpointer()); |
| |
| __ bind(&fallthrough); |
| } |
| |
| |
| void RegExpMacroAssemblerIA32::CheckNotRegistersEqual(int reg1, |
| int reg2, |
| Label* on_not_equal) { |
| __ mov(eax, register_location(reg1)); |
| __ cmp(eax, register_location(reg2)); |
| BranchOrBacktrack(not_equal, on_not_equal); |
| } |
| |
| |
| 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) { |
| __ mov(eax, current_character()); |
| __ and_(eax, mask); |
| __ cmp(eax, c); |
| BranchOrBacktrack(equal, on_equal); |
| } |
| |
| |
| void RegExpMacroAssemblerIA32::CheckNotCharacterAfterAnd(uint32_t c, |
| uint32_t mask, |
| Label* on_not_equal) { |
| __ mov(eax, current_character()); |
| __ and_(eax, mask); |
| __ cmp(eax, c); |
| BranchOrBacktrack(not_equal, on_not_equal); |
| } |
| |
| |
| void RegExpMacroAssemblerIA32::CheckNotCharacterAfterMinusAnd( |
| uc16 c, |
| uc16 minus, |
| uc16 mask, |
| Label* on_not_equal) { |
| ASSERT(minus < String::kMaxUC16CharCode); |
| __ lea(eax, Operand(current_character(), -minus)); |
| __ and_(eax, mask); |
| __ cmp(eax, c); |
| BranchOrBacktrack(not_equal, on_not_equal); |
| } |
| |
| |
| 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_ == ASCII) { |
| // ASCII space characters are '\t'..'\r' and ' '. |
| Label success; |
| __ cmp(current_character(), ' '); |
| __ j(equal, &success); |
| // Check range 0x09..0x0d |
| __ lea(eax, Operand(current_character(), -'\t')); |
| __ cmp(eax, '\r' - '\t'); |
| BranchOrBacktrack(above, 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(), ' '); |
| BranchOrBacktrack(equal, on_no_match); |
| __ lea(eax, Operand(current_character(), -'\t')); |
| __ cmp(eax, '\r' - '\t'); |
| BranchOrBacktrack(below_equal, on_no_match); |
| return true; |
| } |
| 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(Operand(eax), current_character()); |
| __ xor_(Operand(eax), Immediate(0x01)); |
| // See if current character is '\n'^1 or '\r'^1, i.e., 0x0b or 0x0c |
| __ sub(Operand(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(Operand(eax), Immediate(0x2028 - 0x0b)); |
| __ cmp(eax, 0x2029 - 0x2028); |
| BranchOrBacktrack(below_equal, on_no_match); |
| } |
| return true; |
| } |
| case 'w': { |
| if (mode_ != ASCII) { |
| // Table is 128 entries, so all ASCII characters can be tested. |
| __ cmp(Operand(current_character()), Immediate('z')); |
| BranchOrBacktrack(above, on_no_match); |
| } |
| ASSERT_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_ != ASCII) { |
| // Table is 128 entries, so all ASCII characters can be tested. |
| __ cmp(Operand(current_character()), Immediate('z')); |
| __ j(above, &done); |
| } |
| ASSERT_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_ != ASCII) { |
| __ 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(Operand(eax), current_character()); |
| __ xor_(Operand(eax), Immediate(0x01)); |
| // See if current character is '\n'^1 or '\r'^1, i.e., 0x0b or 0x0c |
| __ sub(Operand(eax), Immediate(0x0b)); |
| __ cmp(eax, 0x0c - 0x0b); |
| if (mode_ == ASCII) { |
| BranchOrBacktrack(above, on_no_match); |
| } else { |
| Label done; |
| BranchOrBacktrack(below_equal, &done); |
| ASSERT_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(Operand(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() { |
| ASSERT(FAILURE == 0); // Return value for failure is zero. |
| __ xor_(eax, Operand(eax)); // zero eax. |
| __ jmp(&exit_label_); |
| } |
| |
| |
| Handle<Object> RegExpMacroAssemblerIA32::GetCode(Handle<String> source) { |
| // Finalize code - write the entry point code now we know how many |
| // registers we need. |
| |
| // Entry code: |
| __ bind(&entry_label_); |
| // Start 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)); // Make room for "input start - 1" constant. |
| __ push(Immediate(0)); // Make room for "at start" 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(); |
| __ 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, not_taken); |
| // 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, taken); |
| // Exit with OutOfMemory exception. There is not enough space on the stack |
| // for our working registers. |
| __ mov(eax, EXCEPTION); |
| __ jmp(&exit_label_); |
| |
| __ bind(&stack_limit_hit); |
| CallCheckStackGuardState(ebx); |
| __ or_(eax, Operand(eax)); |
| // If returned value is non-zero, we exit with the returned value as result. |
| __ j(not_zero, &exit_label_); |
| |
| __ bind(&stack_ok); |
| |
| // Allocate space on stack for registers. |
| __ sub(Operand(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, Operand(esi)); |
| // Set eax to address of char before start of input |
| // (effectively string position -1). |
| __ lea(eax, Operand(edi, -char_size())); |
| // Store this value in a local variable, for use when clearing |
| // position registers. |
| __ mov(Operand(ebp, kInputStartMinusOne), eax); |
| |
| // Determine whether the start index is zero, that is at the start of the |
| // string, and store that value in a local variable. |
| __ mov(ebx, Operand(ebp, kStartIndex)); |
| __ xor_(Operand(ecx), ecx); // setcc only operates on cl (lower byte of ecx). |
| __ test(ebx, Operand(ebx)); |
| __ setcc(zero, ecx); // 1 if 0 (start of string), 0 if positive. |
| __ mov(Operand(ebp, kAtStart), ecx); |
| |
| 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). |
| __ mov(ecx, kRegisterZero); |
| Label init_loop; |
| __ bind(&init_loop); |
| __ mov(Operand(ebp, ecx, times_1, +0), eax); |
| __ sub(Operand(ecx), Immediate(kPointerSize)); |
| __ cmp(ecx, kRegisterZero - num_saved_registers_ * kPointerSize); |
| __ j(greater, &init_loop); |
| } |
| // Ensure that we have written 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. |
| } |
| |
| |
| // Initialize backtrack stack pointer. |
| __ mov(backtrack_stackpointer(), Operand(ebp, kStackHighEnd)); |
| // Load previous char as initial value of current-character. |
| Label at_start; |
| __ cmp(Operand(ebp, kAtStart), Immediate(0)); |
| __ j(not_equal, &at_start); |
| LoadCurrentCharacterUnchecked(-1, 1); // Load previous char. |
| __ jmp(&start_label_); |
| __ bind(&at_start); |
| __ mov(current_character(), '\n'); |
| __ 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)); |
| __ sub(ecx, Operand(ebp, kInputStart)); |
| for (int i = 0; i < num_saved_registers_; i++) { |
| __ mov(eax, register_location(i)); |
| __ add(eax, Operand(ecx)); // Convert to index from start, not end. |
| if (mode_ == UC16) { |
| __ sar(eax, 1); // Convert byte index to character index. |
| } |
| __ mov(Operand(ebx, i * kPointerSize), eax); |
| } |
| } |
| __ mov(eax, Immediate(SUCCESS)); |
| } |
| // Exit and return eax |
| __ bind(&exit_label_); |
| // 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, Operand(eax)); |
| // If returning non-zero, we should end execution with the given |
| // result as return value. |
| __ j(not_zero, &exit_label_); |
| |
| __ 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()) |
| int num_arguments = 2; |
| FrameAlign(num_arguments, ebx); |
| __ 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(); |
| 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, Operand(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(&exit_label_); |
| } |
| |
| CodeDesc code_desc; |
| masm_->GetCode(&code_desc); |
| Handle<Code> code = Factory::NewCode(code_desc, |
| NULL, |
| Code::ComputeFlags(Code::REGEXP), |
| masm_->CodeObject()); |
| LOG(RegExpCodeCreateEvent(*code, *source)); |
| return Handle<Object>::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) { |
| 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 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::SetRegister(int register_index, int to) { |
| ASSERT(register_index >= num_saved_registers_); // Reserved for positions! |
| __ mov(register_location(register_index), Immediate(to)); |
| } |
| |
| |
| void RegExpMacroAssemblerIA32::Succeed() { |
| __ jmp(&success_label_); |
| } |
| |
| |
| 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) { |
| ASSERT(reg_from <= reg_to); |
| __ mov(eax, Operand(ebp, kInputStartMinusOne)); |
| 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) { |
| int num_arguments = 3; |
| FrameAlign(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(); |
| 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)); |
| } |
| |
| |
| int RegExpMacroAssemblerIA32::CheckStackGuardState(Address* return_address, |
| Code* re_code, |
| Address re_frame) { |
| if (StackGuard::IsStackOverflow()) { |
| Top::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; |
| Handle<Code> code_handle(re_code); |
| |
| Handle<String> subject(frame_entry<String*>(re_frame, kInputString)); |
| // Current string. |
| bool is_ascii = subject->IsAsciiRepresentation(); |
| |
| ASSERT(re_code->instruction_start() <= *return_address); |
| ASSERT(*return_address <= |
| re_code->instruction_start() + re_code->instruction_size()); |
| |
| Object* result = Execution::HandleStackGuardInterrupt(); |
| |
| if (*code_handle != re_code) { // Return address no longer valid |
| int delta = *code_handle - re_code; |
| // Overwrite the return address on the stack. |
| *return_address += delta; |
| } |
| |
| if (result->IsException()) { |
| return EXCEPTION; |
| } |
| |
| // String might have changed. |
| if (subject->IsAsciiRepresentation() != 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).IsSequential() || |
| StringShape(*subject).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, start_index); |
| |
| 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 = 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; |
| } |
| |
| return 0; |
| } |
| |
| |
| Operand RegExpMacroAssemblerIA32::register_location(int register_index) { |
| ASSERT(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) { |
| __ cmp(edi, -cp_offset * char_size()); |
| BranchOrBacktrack(greater_equal, on_outside_input); |
| } |
| |
| |
| void RegExpMacroAssemblerIA32::BranchOrBacktrack(Condition condition, |
| Label* to, |
| Hint hint) { |
| if (condition < 0) { // No condition |
| if (to == NULL) { |
| Backtrack(); |
| return; |
| } |
| __ jmp(to); |
| return; |
| } |
| if (to == NULL) { |
| __ j(condition, &backtrack_label_, hint); |
| return; |
| } |
| __ j(condition, to, hint); |
| } |
| |
| |
| void RegExpMacroAssemblerIA32::SafeCall(Label* to) { |
| __ call(to); |
| } |
| |
| |
| void RegExpMacroAssemblerIA32::SafeReturn() { |
| __ add(Operand(esp, 0), Immediate(masm_->CodeObject())); |
| __ ret(0); |
| } |
| |
| |
| void RegExpMacroAssemblerIA32::SafeCallTarget(Label* name) { |
| __ bind(name); |
| __ sub(Operand(esp, 0), Immediate(masm_->CodeObject())); |
| } |
| |
| |
| void RegExpMacroAssemblerIA32::Push(Register source) { |
| ASSERT(!source.is(backtrack_stackpointer())); |
| // Notice: This updates flags, unlike normal Push. |
| __ sub(Operand(backtrack_stackpointer()), Immediate(kPointerSize)); |
| __ mov(Operand(backtrack_stackpointer(), 0), source); |
| } |
| |
| |
| void RegExpMacroAssemblerIA32::Push(Immediate value) { |
| // Notice: This updates flags, unlike normal Push. |
| __ sub(Operand(backtrack_stackpointer()), Immediate(kPointerSize)); |
| __ mov(Operand(backtrack_stackpointer(), 0), value); |
| } |
| |
| |
| void RegExpMacroAssemblerIA32::Pop(Register target) { |
| ASSERT(!target.is(backtrack_stackpointer())); |
| __ mov(target, Operand(backtrack_stackpointer(), 0)); |
| // Notice: This updates flags, unlike normal Pop. |
| __ add(Operand(backtrack_stackpointer()), Immediate(kPointerSize)); |
| } |
| |
| |
| void RegExpMacroAssemblerIA32::CheckPreemption() { |
| // Check for preemption. |
| Label no_preempt; |
| ExternalReference stack_limit = |
| ExternalReference::address_of_stack_limit(); |
| __ cmp(esp, Operand::StaticVariable(stack_limit)); |
| __ j(above, &no_preempt, taken); |
| |
| SafeCall(&check_preempt_label_); |
| |
| __ bind(&no_preempt); |
| } |
| |
| |
| void RegExpMacroAssemblerIA32::CheckStackLimit() { |
| Label no_stack_overflow; |
| ExternalReference stack_limit = |
| ExternalReference::address_of_regexp_stack_limit(); |
| __ cmp(backtrack_stackpointer(), Operand::StaticVariable(stack_limit)); |
| __ j(above, &no_stack_overflow); |
| |
| SafeCall(&stack_overflow_label_); |
| |
| __ bind(&no_stack_overflow); |
| } |
| |
| |
| void RegExpMacroAssemblerIA32::FrameAlign(int num_arguments, Register scratch) { |
| // TODO(lrn): Since we no longer use the system stack arbitrarily (but we do |
| // use it, e.g., for SafeCall), we know the number of elements on the stack |
| // since the last frame alignment. We might be able to do this simpler then. |
| int frameAlignment = OS::ActivationFrameAlignment(); |
| if (frameAlignment != 0) { |
| // Make stack end at alignment and make room for num_arguments words |
| // and the original value of esp. |
| __ mov(scratch, esp); |
| __ sub(Operand(esp), Immediate((num_arguments + 1) * kPointerSize)); |
| ASSERT(IsPowerOf2(frameAlignment)); |
| __ and_(esp, -frameAlignment); |
| __ mov(Operand(esp, num_arguments * kPointerSize), scratch); |
| } else { |
| __ sub(Operand(esp), Immediate(num_arguments * kPointerSize)); |
| } |
| } |
| |
| |
| void RegExpMacroAssemblerIA32::CallCFunction(ExternalReference function, |
| int num_arguments) { |
| __ mov(Operand(eax), Immediate(function)); |
| __ call(Operand(eax)); |
| if (OS::ActivationFrameAlignment() != 0) { |
| __ mov(esp, Operand(esp, num_arguments * kPointerSize)); |
| } else { |
| __ add(Operand(esp), Immediate(num_arguments * sizeof(int32_t))); |
| } |
| } |
| |
| |
| void RegExpMacroAssemblerIA32::LoadCurrentCharacterUnchecked(int cp_offset, |
| int characters) { |
| if (mode_ == ASCII) { |
| 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 { |
| ASSERT(characters == 1); |
| __ movzx_b(current_character(), Operand(esi, edi, times_1, cp_offset)); |
| } |
| } else { |
| ASSERT(mode_ == UC16); |
| if (characters == 2) { |
| __ mov(current_character(), |
| Operand(esi, edi, times_1, cp_offset * sizeof(uc16))); |
| } else { |
| ASSERT(characters == 1); |
| __ movzx_w(current_character(), |
| Operand(esi, edi, times_1, cp_offset * sizeof(uc16))); |
| } |
| } |
| } |
| |
| |
| #undef __ |
| |
| #endif // V8_NATIVE_REGEXP |
| |
| }} // namespace v8::internal |
