| // Copyright 2015 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. |
| |
| #include "src/v8.h" |
| |
| #if V8_TARGET_ARCH_S390 |
| |
| #include "src/assembler-inl.h" |
| #include "src/base/bits.h" |
| #include "src/code-stubs.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/regexp/s390/regexp-macro-assembler-s390.h" |
| #include "src/unicode.h" |
| |
| namespace v8 { |
| namespace internal { |
| |
| #ifndef V8_INTERPRETED_REGEXP |
| /* |
| * This assembler uses the following register assignment convention |
| * - r6: Temporarily stores the index of capture start after a matching pass |
| * for a global regexp. |
| * - r7: Pointer to current code object (Code*) including heap object tag. |
| * - r8: Current position in input, as negative offset from end of string. |
| * Please notice that this is the byte offset, not the character offset! |
| * - r9: Currently loaded character. Must be loaded using |
| * LoadCurrentCharacter before using any of the dispatch methods. |
| * - r13: Points to tip of backtrack stack |
| * - 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. |
| * - r15/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[108] Isolate* isolate (address of the current isolate) |
| * - fp[104] direct_call (if 1, direct call from JavaScript code, |
| * if 0, call through the runtime system). |
| * - fp[100] stack_area_base (high end of the memory area to use as |
| * backtracking stack). |
| * - fp[96] capture array size (may fit multiple sets of matches) |
| * - fp[0..96] zLinux ABI register saving area |
| * --- sp when called --- |
| * --- frame pointer ---- |
| * - fp[-4] direct_call (if 1, direct call from JavaScript code, |
| * if 0, call through the runtime system). |
| * - fp[-8] stack_area_base (high end of the memory area to use as |
| * backtracking stack). |
| * - fp[-12] capture array size (may fit multiple sets of matches) |
| * - fp[-16] int* capture_array (int[num_saved_registers_], for output). |
| * - fp[-20] end of input (address of end of string). |
| * - fp[-24] start of input (address of first character in string). |
| * - fp[-28] start index (character index of start). |
| * - fp[-32] void* input_string (location of a handle containing the string). |
| * - fp[-36] success counter (only for global regexps to count matches). |
| * - fp[-40] Offset of location before start of input (effectively character |
| * string start - 1). Used to initialize capture registers to a |
| * non-position. |
| * - fp[-44] At start (if 1, we are starting at the start of the |
| * string, otherwise 0) |
| * - fp[-48] register 0 (Only positions must be stored in the first |
| * - register 1 num_saved_registers_ registers) |
| * - ... |
| * - register num_registers-1 |
| * --- sp --- |
| * |
| * The first num_saved_registers_ registers are initialized to point to |
| * "character -1" in the string (i.e., char_size() bytes before the first |
| * character of the string). The remaining registers start out as garbage. |
| * |
| * The data up to the return address must be placed there by the calling |
| * code and the remaining arguments are passed in registers, e.g. by calling the |
| * code entry as cast to a function with the signature: |
| * int (*match)(String* input_string, |
| * int start_index, |
| * Address start, |
| * Address end, |
| * int* capture_output_array, |
| * int num_capture_registers, |
| * byte* stack_area_base, |
| * bool direct_call = false, |
| * Isolate* isolate); |
| * The call is performed by NativeRegExpMacroAssembler::Execute() |
| * (in regexp-macro-assembler.cc) via the GeneratedCode wrapper. |
| */ |
| |
| #define __ ACCESS_MASM(masm_) |
| |
| RegExpMacroAssemblerS390::RegExpMacroAssemblerS390(Isolate* isolate, Zone* zone, |
| Mode mode, |
| int registers_to_save) |
| : NativeRegExpMacroAssembler(isolate, zone), |
| masm_(new MacroAssembler(isolate, nullptr, kRegExpCodeSize, |
| CodeObjectRequired::kYes)), |
| mode_(mode), |
| num_registers_(registers_to_save), |
| num_saved_registers_(registers_to_save), |
| entry_label_(), |
| start_label_(), |
| success_label_(), |
| backtrack_label_(), |
| exit_label_(), |
| internal_failure_label_() { |
| DCHECK_EQ(0, registers_to_save % 2); |
| |
| __ b(&entry_label_); // We'll write the entry code later. |
| // If the code gets too big or corrupted, an internal exception will be |
| // raised, and we will exit right away. |
| __ bind(&internal_failure_label_); |
| __ LoadImmP(r2, Operand(FAILURE)); |
| __ Ret(); |
| __ bind(&start_label_); // And then continue from here. |
| } |
| |
| RegExpMacroAssemblerS390::~RegExpMacroAssemblerS390() { |
| delete masm_; |
| // Unuse labels in case we throw away the assembler without calling GetCode. |
| entry_label_.Unuse(); |
| start_label_.Unuse(); |
| success_label_.Unuse(); |
| backtrack_label_.Unuse(); |
| exit_label_.Unuse(); |
| check_preempt_label_.Unuse(); |
| stack_overflow_label_.Unuse(); |
| internal_failure_label_.Unuse(); |
| } |
| |
| int RegExpMacroAssemblerS390::stack_limit_slack() { |
| return RegExpStack::kStackLimitSlack; |
| } |
| |
| void RegExpMacroAssemblerS390::AdvanceCurrentPosition(int by) { |
| if (by != 0) { |
| __ AddP(current_input_offset(), Operand(by * char_size())); |
| } |
| } |
| |
| void RegExpMacroAssemblerS390::AdvanceRegister(int reg, int by) { |
| DCHECK_LE(0, reg); |
| DCHECK_GT(num_registers_, reg); |
| if (by != 0) { |
| if (CpuFeatures::IsSupported(GENERAL_INSTR_EXT) && is_int8(by)) { |
| __ AddMI(register_location(reg), Operand(by)); |
| } else { |
| __ LoadP(r2, register_location(reg), r0); |
| __ mov(r0, Operand(by)); |
| __ AddRR(r2, r0); |
| __ StoreP(r2, register_location(reg)); |
| } |
| } |
| } |
| |
| void RegExpMacroAssemblerS390::Backtrack() { |
| CheckPreemption(); |
| // Pop Code* offset from backtrack stack, add Code* and jump to location. |
| Pop(r2); |
| __ AddP(r2, code_pointer()); |
| __ b(r2); |
| } |
| |
| void RegExpMacroAssemblerS390::Bind(Label* label) { __ bind(label); } |
| |
| void RegExpMacroAssemblerS390::CheckCharacter(uint32_t c, Label* on_equal) { |
| __ CmpLogicalP(current_character(), Operand(c)); |
| BranchOrBacktrack(eq, on_equal); |
| } |
| |
| void RegExpMacroAssemblerS390::CheckCharacterGT(uc16 limit, Label* on_greater) { |
| __ CmpLogicalP(current_character(), Operand(limit)); |
| BranchOrBacktrack(gt, on_greater); |
| } |
| |
| void RegExpMacroAssemblerS390::CheckAtStart(Label* on_at_start) { |
| __ LoadP(r3, MemOperand(frame_pointer(), kStringStartMinusOne)); |
| __ AddP(r2, current_input_offset(), Operand(-char_size())); |
| __ CmpP(r2, r3); |
| BranchOrBacktrack(eq, on_at_start); |
| } |
| |
| void RegExpMacroAssemblerS390::CheckNotAtStart(int cp_offset, |
| Label* on_not_at_start) { |
| __ LoadP(r3, MemOperand(frame_pointer(), kStringStartMinusOne)); |
| __ AddP(r2, current_input_offset(), |
| Operand(-char_size() + cp_offset * char_size())); |
| __ CmpP(r2, r3); |
| BranchOrBacktrack(ne, on_not_at_start); |
| } |
| |
| void RegExpMacroAssemblerS390::CheckCharacterLT(uc16 limit, Label* on_less) { |
| __ CmpLogicalP(current_character(), Operand(limit)); |
| BranchOrBacktrack(lt, on_less); |
| } |
| |
| void RegExpMacroAssemblerS390::CheckGreedyLoop(Label* on_equal) { |
| Label backtrack_non_equal; |
| __ CmpP(current_input_offset(), MemOperand(backtrack_stackpointer(), 0)); |
| __ bne(&backtrack_non_equal); |
| __ AddP(backtrack_stackpointer(), Operand(kPointerSize)); |
| |
| BranchOrBacktrack(al, on_equal); |
| __ bind(&backtrack_non_equal); |
| } |
| |
| void RegExpMacroAssemblerS390::CheckNotBackReferenceIgnoreCase( |
| int start_reg, bool read_backward, bool unicode, Label* on_no_match) { |
| Label fallthrough; |
| __ LoadP(r2, register_location(start_reg)); // Index of start of |
| // capture |
| __ LoadP(r3, register_location(start_reg + 1)); // Index of end |
| __ SubP(r3, r3, r2); |
| |
| // At this point, the capture registers are either both set or both cleared. |
| // If the capture length is zero, then the capture is either empty or cleared. |
| // Fall through in both cases. |
| __ beq(&fallthrough); |
| |
| // Check that there are enough characters left in the input. |
| if (read_backward) { |
| __ LoadP(r5, MemOperand(frame_pointer(), kStringStartMinusOne)); |
| __ AddP(r5, r5, r3); |
| __ CmpP(current_input_offset(), r5); |
| BranchOrBacktrack(le, on_no_match); |
| } else { |
| __ AddP(r0, r3, current_input_offset()); |
| BranchOrBacktrack(gt, on_no_match); |
| } |
| |
| if (mode_ == LATIN1) { |
| Label success; |
| Label fail; |
| Label loop_check; |
| |
| // r2 - offset of start of capture |
| // r3 - length of capture |
| __ AddP(r2, end_of_input_address()); |
| __ AddP(r4, current_input_offset(), end_of_input_address()); |
| if (read_backward) { |
| __ SubP(r4, r4, r3); // Offset by length when matching backwards. |
| } |
| __ mov(r1, Operand::Zero()); |
| |
| // r1 - Loop index |
| // r2 - Address of start of capture. |
| // r4 - Address of current input position. |
| |
| Label loop; |
| __ bind(&loop); |
| __ LoadlB(r5, MemOperand(r2, r1)); |
| __ LoadlB(r6, MemOperand(r4, r1)); |
| |
| __ CmpP(r6, r5); |
| __ beq(&loop_check); |
| |
| // Mismatch, try case-insensitive match (converting letters to lower-case). |
| __ Or(r5, Operand(0x20)); // Convert capture character to lower-case. |
| __ Or(r6, Operand(0x20)); // Also convert input character. |
| __ CmpP(r6, r5); |
| __ bne(&fail); |
| __ SubP(r5, Operand('a')); |
| __ CmpLogicalP(r5, Operand('z' - 'a')); // Is r5 a lowercase letter? |
| __ ble(&loop_check); // In range 'a'-'z'. |
| // Latin-1: Check for values in range [224,254] but not 247. |
| __ SubP(r5, Operand(224 - 'a')); |
| __ CmpLogicalP(r5, Operand(254 - 224)); |
| __ bgt(&fail); // Weren't Latin-1 letters. |
| __ CmpLogicalP(r5, Operand(247 - 224)); // Check for 247. |
| __ beq(&fail); |
| |
| __ bind(&loop_check); |
| __ la(r1, MemOperand(r1, char_size())); |
| __ CmpP(r1, r3); |
| __ blt(&loop); |
| __ b(&success); |
| |
| __ bind(&fail); |
| BranchOrBacktrack(al, on_no_match); |
| |
| __ bind(&success); |
| // Compute new value of character position after the matched part. |
| __ SubP(current_input_offset(), r4, end_of_input_address()); |
| if (read_backward) { |
| __ LoadP(r2, register_location(start_reg)); // Index of start of capture |
| __ LoadP(r3, |
| register_location(start_reg + 1)); // Index of end of capture |
| __ AddP(current_input_offset(), current_input_offset(), r2); |
| __ SubP(current_input_offset(), current_input_offset(), r3); |
| } |
| __ AddP(current_input_offset(), r1); |
| } else { |
| DCHECK(mode_ == UC16); |
| int argument_count = 4; |
| __ PrepareCallCFunction(argument_count, r4); |
| |
| // r2 - offset of start of capture |
| // r3 - length of capture |
| |
| // Put arguments into arguments registers. |
| // Parameters are |
| // r2: Address byte_offset1 - Address captured substring's start. |
| // r3: Address byte_offset2 - Address of current character position. |
| // r4: size_t byte_length - length of capture in bytes(!) |
| // r5: Isolate* isolate or 0 if unicode flag. |
| |
| // Address of start of capture. |
| __ AddP(r2, end_of_input_address()); |
| // Length of capture. |
| __ LoadRR(r4, r3); |
| // Save length in callee-save register for use on return. |
| __ LoadRR(r6, r3); |
| // Address of current input position. |
| __ AddP(r3, current_input_offset(), end_of_input_address()); |
| if (read_backward) { |
| __ SubP(r3, r3, r6); |
| } |
| // Isolate. |
| #ifdef V8_INTL_SUPPORT |
| if (unicode) { |
| __ LoadImmP(r5, Operand::Zero()); |
| } else // NOLINT |
| #endif // V8_INTL_SUPPORT |
| { |
| __ mov(r5, Operand(ExternalReference::isolate_address(isolate()))); |
| } |
| |
| { |
| AllowExternalCallThatCantCauseGC scope(masm_); |
| ExternalReference function = |
| ExternalReference::re_case_insensitive_compare_uc16(isolate()); |
| __ CallCFunction(function, argument_count); |
| } |
| |
| // Check if function returned non-zero for success or zero for failure. |
| __ CmpP(r2, Operand::Zero()); |
| BranchOrBacktrack(eq, on_no_match); |
| |
| // On success, advance position by length of capture. |
| if (read_backward) { |
| __ SubP(current_input_offset(), current_input_offset(), r6); |
| } else { |
| __ AddP(current_input_offset(), current_input_offset(), r6); |
| } |
| } |
| |
| __ bind(&fallthrough); |
| } |
| |
| void RegExpMacroAssemblerS390::CheckNotBackReference(int start_reg, |
| bool read_backward, |
| Label* on_no_match) { |
| Label fallthrough; |
| Label success; |
| |
| // Find length of back-referenced capture. |
| __ LoadP(r2, register_location(start_reg)); |
| __ LoadP(r3, register_location(start_reg + 1)); |
| __ SubP(r3, r3, r2); // Length to check. |
| |
| // At this point, the capture registers are either both set or both cleared. |
| // If the capture length is zero, then the capture is either empty or cleared. |
| // Fall through in both cases. |
| __ beq(&fallthrough); |
| |
| // Check that there are enough characters left in the input. |
| if (read_backward) { |
| __ LoadP(r5, MemOperand(frame_pointer(), kStringStartMinusOne)); |
| __ AddP(r5, r5, r3); |
| __ CmpP(current_input_offset(), r5); |
| BranchOrBacktrack(le, on_no_match); |
| } else { |
| __ AddP(r0, r3, current_input_offset()); |
| BranchOrBacktrack(gt, on_no_match, cr0); |
| } |
| |
| // r2 - offset of start of capture |
| // r3 - length of capture |
| __ la(r2, MemOperand(r2, end_of_input_address())); |
| __ la(r4, MemOperand(current_input_offset(), end_of_input_address())); |
| if (read_backward) { |
| __ SubP(r4, r4, r3); // Offset by length when matching backwards. |
| } |
| __ mov(r1, Operand::Zero()); |
| |
| Label loop; |
| __ bind(&loop); |
| if (mode_ == LATIN1) { |
| __ LoadlB(r5, MemOperand(r2, r1)); |
| __ LoadlB(r6, MemOperand(r4, r1)); |
| } else { |
| DCHECK(mode_ == UC16); |
| __ LoadLogicalHalfWordP(r5, MemOperand(r2, r1)); |
| __ LoadLogicalHalfWordP(r6, MemOperand(r4, r1)); |
| } |
| __ la(r1, MemOperand(r1, char_size())); |
| __ CmpP(r5, r6); |
| BranchOrBacktrack(ne, on_no_match); |
| __ CmpP(r1, r3); |
| __ blt(&loop); |
| |
| // Move current character position to position after match. |
| __ SubP(current_input_offset(), r4, end_of_input_address()); |
| if (read_backward) { |
| __ LoadP(r2, register_location(start_reg)); // Index of start of capture |
| __ LoadP(r3, register_location(start_reg + 1)); // Index of end of capture |
| __ AddP(current_input_offset(), current_input_offset(), r2); |
| __ SubP(current_input_offset(), current_input_offset(), r3); |
| } |
| __ AddP(current_input_offset(), r1); |
| |
| __ bind(&fallthrough); |
| } |
| |
| void RegExpMacroAssemblerS390::CheckNotCharacter(unsigned c, |
| Label* on_not_equal) { |
| __ CmpLogicalP(current_character(), Operand(c)); |
| BranchOrBacktrack(ne, on_not_equal); |
| } |
| |
| void RegExpMacroAssemblerS390::CheckCharacterAfterAnd(uint32_t c, uint32_t mask, |
| Label* on_equal) { |
| __ AndP(r2, current_character(), Operand(mask)); |
| if (c != 0) { |
| __ CmpLogicalP(r2, Operand(c)); |
| } |
| BranchOrBacktrack(eq, on_equal); |
| } |
| |
| void RegExpMacroAssemblerS390::CheckNotCharacterAfterAnd(unsigned c, |
| unsigned mask, |
| Label* on_not_equal) { |
| __ AndP(r2, current_character(), Operand(mask)); |
| if (c != 0) { |
| __ CmpLogicalP(r2, Operand(c)); |
| } |
| BranchOrBacktrack(ne, on_not_equal); |
| } |
| |
| void RegExpMacroAssemblerS390::CheckNotCharacterAfterMinusAnd( |
| uc16 c, uc16 minus, uc16 mask, Label* on_not_equal) { |
| DCHECK_GT(String::kMaxUtf16CodeUnit, minus); |
| __ lay(r2, MemOperand(current_character(), -minus)); |
| __ And(r2, Operand(mask)); |
| if (c != 0) { |
| __ CmpLogicalP(r2, Operand(c)); |
| } |
| BranchOrBacktrack(ne, on_not_equal); |
| } |
| |
| void RegExpMacroAssemblerS390::CheckCharacterInRange(uc16 from, uc16 to, |
| Label* on_in_range) { |
| __ lay(r2, MemOperand(current_character(), -from)); |
| __ CmpLogicalP(r2, Operand(to - from)); |
| BranchOrBacktrack(le, on_in_range); // Unsigned lower-or-same condition. |
| } |
| |
| void RegExpMacroAssemblerS390::CheckCharacterNotInRange( |
| uc16 from, uc16 to, Label* on_not_in_range) { |
| __ lay(r2, MemOperand(current_character(), -from)); |
| __ CmpLogicalP(r2, Operand(to - from)); |
| BranchOrBacktrack(gt, on_not_in_range); // Unsigned higher condition. |
| } |
| |
| void RegExpMacroAssemblerS390::CheckBitInTable(Handle<ByteArray> table, |
| Label* on_bit_set) { |
| __ mov(r2, Operand(table)); |
| Register index = current_character(); |
| if (mode_ != LATIN1 || kTableMask != String::kMaxOneByteCharCode) { |
| __ AndP(r3, current_character(), Operand(kTableSize - 1)); |
| index = r3; |
| } |
| __ LoadlB(r2, |
| MemOperand(r2, index, (ByteArray::kHeaderSize - kHeapObjectTag))); |
| __ CmpP(r2, Operand::Zero()); |
| BranchOrBacktrack(ne, on_bit_set); |
| } |
| |
| bool RegExpMacroAssemblerS390::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; |
| __ CmpP(current_character(), Operand(' ')); |
| __ beq(&success); |
| // Check range 0x09..0x0D |
| __ SubP(r2, current_character(), Operand('\t')); |
| __ CmpLogicalP(r2, Operand('\r' - '\t')); |
| __ ble(&success); |
| // \u00a0 (NBSP). |
| __ CmpLogicalP(r2, Operand(0x00A0 - '\t')); |
| BranchOrBacktrack(ne, on_no_match); |
| __ bind(&success); |
| return true; |
| } |
| return false; |
| case 'S': |
| // The emitted code for generic character classes is good enough. |
| return false; |
| case 'd': |
| // Match ASCII digits ('0'..'9') |
| __ SubP(r2, current_character(), Operand('0')); |
| __ CmpLogicalP(r2, Operand('9' - '0')); |
| BranchOrBacktrack(gt, on_no_match); |
| return true; |
| case 'D': |
| // Match non ASCII-digits |
| __ SubP(r2, current_character(), Operand('0')); |
| __ CmpLogicalP(r2, Operand('9' - '0')); |
| BranchOrBacktrack(le, on_no_match); |
| return true; |
| case '.': { |
| // Match non-newlines (not 0x0A('\n'), 0x0D('\r'), 0x2028 and 0x2029) |
| __ XorP(r2, current_character(), Operand(0x01)); |
| // See if current character is '\n'^1 or '\r'^1, i.e., 0x0B or 0x0C |
| __ SubP(r2, Operand(0x0B)); |
| __ CmpLogicalP(r2, Operand(0x0C - 0x0B)); |
| BranchOrBacktrack(le, on_no_match); |
| if (mode_ == UC16) { |
| // Compare original value to 0x2028 and 0x2029, using the already |
| // computed (current_char ^ 0x01 - 0x0B). I.e., check for |
| // 0x201D (0x2028 - 0x0B) or 0x201E. |
| __ SubP(r2, Operand(0x2028 - 0x0B)); |
| __ CmpLogicalP(r2, Operand(1)); |
| BranchOrBacktrack(le, on_no_match); |
| } |
| return true; |
| } |
| case 'n': { |
| // Match newlines (0x0A('\n'), 0x0D('\r'), 0x2028 and 0x2029) |
| __ XorP(r2, current_character(), Operand(0x01)); |
| // See if current character is '\n'^1 or '\r'^1, i.e., 0x0B or 0x0C |
| __ SubP(r2, Operand(0x0B)); |
| __ CmpLogicalP(r2, Operand(0x0C - 0x0B)); |
| if (mode_ == LATIN1) { |
| BranchOrBacktrack(gt, on_no_match); |
| } else { |
| Label done; |
| __ ble(&done); |
| // Compare original value to 0x2028 and 0x2029, using the already |
| // computed (current_char ^ 0x01 - 0x0B). I.e., check for |
| // 0x201D (0x2028 - 0x0B) or 0x201E. |
| __ SubP(r2, Operand(0x2028 - 0x0B)); |
| __ CmpLogicalP(r2, Operand(1)); |
| BranchOrBacktrack(gt, on_no_match); |
| __ bind(&done); |
| } |
| return true; |
| } |
| case 'w': { |
| if (mode_ != LATIN1) { |
| // Table is 1256 entries, so all LATIN1 characters can be tested. |
| __ CmpP(current_character(), Operand('z')); |
| BranchOrBacktrack(gt, on_no_match); |
| } |
| ExternalReference map = ExternalReference::re_word_character_map(); |
| __ mov(r2, Operand(map)); |
| __ LoadlB(r2, MemOperand(r2, current_character())); |
| __ CmpLogicalP(r2, Operand::Zero()); |
| BranchOrBacktrack(eq, on_no_match); |
| return true; |
| } |
| case 'W': { |
| Label done; |
| if (mode_ != LATIN1) { |
| // Table is 256 entries, so all LATIN characters can be tested. |
| __ CmpLogicalP(current_character(), Operand('z')); |
| __ bgt(&done); |
| } |
| ExternalReference map = ExternalReference::re_word_character_map(); |
| __ mov(r2, Operand(map)); |
| __ LoadlB(r2, MemOperand(r2, current_character())); |
| __ CmpLogicalP(r2, Operand::Zero()); |
| BranchOrBacktrack(ne, on_no_match); |
| if (mode_ != LATIN1) { |
| __ bind(&done); |
| } |
| return true; |
| } |
| case '*': |
| // Match any character. |
| return true; |
| // No custom implementation (yet): s(UC16), S(UC16). |
| default: |
| return false; |
| } |
| } |
| |
| void RegExpMacroAssemblerS390::Fail() { |
| __ LoadImmP(r2, Operand(FAILURE)); |
| __ b(&exit_label_); |
| } |
| |
| Handle<HeapObject> RegExpMacroAssemblerS390::GetCode(Handle<String> source) { |
| Label return_r2; |
| |
| // Finalize code - write the entry point code now we know how many |
| // registers we need. |
| |
| // Entry code: |
| __ bind(&entry_label_); |
| |
| // Tell the system that we have a stack frame. Because the type |
| // is MANUAL, no is generated. |
| FrameScope scope(masm_, StackFrame::MANUAL); |
| |
| // Ensure register assigments are consistent with callee save mask |
| DCHECK(r6.bit() & kRegExpCalleeSaved); |
| DCHECK(code_pointer().bit() & kRegExpCalleeSaved); |
| DCHECK(current_input_offset().bit() & kRegExpCalleeSaved); |
| DCHECK(current_character().bit() & kRegExpCalleeSaved); |
| DCHECK(backtrack_stackpointer().bit() & kRegExpCalleeSaved); |
| DCHECK(end_of_input_address().bit() & kRegExpCalleeSaved); |
| DCHECK(frame_pointer().bit() & kRegExpCalleeSaved); |
| |
| // zLinux ABI |
| // Incoming parameters: |
| // r2: input_string |
| // r3: start_index |
| // r4: start addr |
| // r5: end addr |
| // r6: capture output arrray |
| // Requires us to save the callee-preserved registers r6-r13 |
| // General convention is to also save r14 (return addr) and |
| // sp/r15 as well in a single STM/STMG |
| __ StoreMultipleP(r6, sp, MemOperand(sp, 6 * kPointerSize)); |
| |
| // Load stack parameters from caller stack frame |
| __ LoadMultipleP(r7, r9, |
| MemOperand(sp, kStackFrameExtraParamSlot * kPointerSize)); |
| // r7 = capture array size |
| // r8 = stack area base |
| // r9 = direct call |
| |
| // 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. |
| // |
| // Set frame pointer in space for it if this is not a direct call |
| // from generated code. |
| __ LoadRR(frame_pointer(), sp); |
| __ lay(sp, MemOperand(sp, -10 * kPointerSize)); |
| __ mov(r1, Operand::Zero()); // success counter |
| __ LoadRR(r0, r1); // offset of location |
| __ StoreMultipleP(r0, r9, MemOperand(sp, 0)); |
| |
| // 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(r2, Operand(stack_limit)); |
| __ LoadP(r2, MemOperand(r2)); |
| __ SubP(r2, sp, r2); |
| // Handle it if the stack pointer is already below the stack limit. |
| __ ble(&stack_limit_hit); |
| // Check if there is room for the variable number of registers above |
| // the stack limit. |
| __ CmpLogicalP(r2, Operand(num_registers_ * kPointerSize)); |
| __ bge(&stack_ok); |
| // Exit with OutOfMemory exception. There is not enough space on the stack |
| // for our working registers. |
| __ mov(r2, Operand(EXCEPTION)); |
| __ b(&return_r2); |
| |
| __ bind(&stack_limit_hit); |
| CallCheckStackGuardState(r2); |
| __ CmpP(r2, Operand::Zero()); |
| // If returned value is non-zero, we exit with the returned value as result. |
| __ bne(&return_r2); |
| |
| __ bind(&stack_ok); |
| |
| // Allocate space on stack for registers. |
| __ lay(sp, MemOperand(sp, (-num_registers_ * kPointerSize))); |
| // Load string end. |
| __ LoadP(end_of_input_address(), MemOperand(frame_pointer(), kInputEnd)); |
| // Load input start. |
| __ LoadP(r4, MemOperand(frame_pointer(), kInputStart)); |
| // Find negative length (offset of start relative to end). |
| __ SubP(current_input_offset(), r4, end_of_input_address()); |
| __ LoadP(r3, MemOperand(frame_pointer(), kStartIndex)); |
| // Set r1 to address of char before start of the input string |
| // (effectively string position -1). |
| __ LoadRR(r1, r4); |
| __ SubP(r1, current_input_offset(), Operand(char_size())); |
| if (mode_ == UC16) { |
| __ ShiftLeftP(r0, r3, Operand(1)); |
| __ SubP(r1, r1, r0); |
| } else { |
| __ SubP(r1, r1, r3); |
| } |
| // Store this value in a local variable, for use when clearing |
| // position registers. |
| __ StoreP(r1, MemOperand(frame_pointer(), kStringStartMinusOne)); |
| |
| // Initialize code pointer register |
| __ mov(code_pointer(), Operand(masm_->CodeObject())); |
| |
| Label load_char_start_regexp, start_regexp; |
| // Load newline if index is at start, previous character otherwise. |
| __ CmpP(r3, Operand::Zero()); |
| __ bne(&load_char_start_regexp); |
| __ mov(current_character(), Operand('\n')); |
| __ b(&start_regexp); |
| |
| // Global regexp restarts matching here. |
| __ bind(&load_char_start_regexp); |
| // Load previous char as initial value of current character register. |
| LoadCurrentCharacterUnchecked(-1, 1); |
| __ bind(&start_regexp); |
| |
| // Initialize on-stack registers. |
| if (num_saved_registers_ > 0) { // Always is, if generated from a regexp. |
| // Fill saved registers with initial value = start offset - 1 |
| if (num_saved_registers_ > 8) { |
| // One slot beyond address of register 0. |
| __ lay(r3, MemOperand(frame_pointer(), kRegisterZero + kPointerSize)); |
| __ LoadImmP(r4, Operand(num_saved_registers_)); |
| Label init_loop; |
| __ bind(&init_loop); |
| __ StoreP(r1, MemOperand(r3, -kPointerSize)); |
| __ lay(r3, MemOperand(r3, -kPointerSize)); |
| __ BranchOnCount(r4, &init_loop); |
| } else { |
| for (int i = 0; i < num_saved_registers_; i++) { |
| __ StoreP(r1, register_location(i)); |
| } |
| } |
| } |
| |
| // Initialize backtrack stack pointer. |
| __ LoadP(backtrack_stackpointer(), |
| MemOperand(frame_pointer(), kStackHighEnd)); |
| |
| __ b(&start_label_); |
| |
| // Exit code: |
| if (success_label_.is_linked()) { |
| // Save captures when successful. |
| __ bind(&success_label_); |
| if (num_saved_registers_ > 0) { |
| // copy captures to output |
| __ LoadP(r0, MemOperand(frame_pointer(), kInputStart)); |
| __ LoadP(r2, MemOperand(frame_pointer(), kRegisterOutput)); |
| __ LoadP(r4, MemOperand(frame_pointer(), kStartIndex)); |
| __ SubP(r0, end_of_input_address(), r0); |
| // r0 is length of input in bytes. |
| if (mode_ == UC16) { |
| __ ShiftRightP(r0, r0, Operand(1)); |
| } |
| // r0 is length of input in characters. |
| __ AddP(r0, r4); |
| // r0 is length of string in characters. |
| |
| DCHECK_EQ(0, num_saved_registers_ % 2); |
| // Always an even number of capture registers. This allows us to |
| // unroll the loop once to add an operation between a load of a register |
| // and the following use of that register. |
| __ lay(r2, MemOperand(r2, num_saved_registers_ * kIntSize)); |
| for (int i = 0; i < num_saved_registers_;) { |
| if ((false) && i < num_saved_registers_ - 4) { |
| // TODO(john.yan): Can be optimized by SIMD instructions |
| __ LoadMultipleP(r3, r6, register_location(i + 3)); |
| if (mode_ == UC16) { |
| __ ShiftRightArithP(r3, r3, Operand(1)); |
| __ ShiftRightArithP(r4, r4, Operand(1)); |
| __ ShiftRightArithP(r5, r5, Operand(1)); |
| __ ShiftRightArithP(r6, r6, Operand(1)); |
| } |
| __ AddP(r3, r0); |
| __ AddP(r4, r0); |
| __ AddP(r5, r0); |
| __ AddP(r6, r0); |
| __ StoreW(r3, |
| MemOperand(r2, -(num_saved_registers_ - i - 3) * kIntSize)); |
| __ StoreW(r4, |
| MemOperand(r2, -(num_saved_registers_ - i - 2) * kIntSize)); |
| __ StoreW(r5, |
| MemOperand(r2, -(num_saved_registers_ - i - 1) * kIntSize)); |
| __ StoreW(r6, MemOperand(r2, -(num_saved_registers_ - i) * kIntSize)); |
| i += 4; |
| } else { |
| __ LoadMultipleP(r3, r4, register_location(i + 1)); |
| if (mode_ == UC16) { |
| __ ShiftRightArithP(r3, r3, Operand(1)); |
| __ ShiftRightArithP(r4, r4, Operand(1)); |
| } |
| __ AddP(r3, r0); |
| __ AddP(r4, r0); |
| __ StoreW(r3, |
| MemOperand(r2, -(num_saved_registers_ - i - 1) * kIntSize)); |
| __ StoreW(r4, MemOperand(r2, -(num_saved_registers_ - i) * kIntSize)); |
| i += 2; |
| } |
| } |
| if (global_with_zero_length_check()) { |
| // Keep capture start in r6 for the zero-length check later. |
| __ LoadP(r6, register_location(0)); |
| } |
| } |
| |
| if (global()) { |
| // Restart matching if the regular expression is flagged as global. |
| __ LoadP(r2, MemOperand(frame_pointer(), kSuccessfulCaptures)); |
| __ LoadP(r3, MemOperand(frame_pointer(), kNumOutputRegisters)); |
| __ LoadP(r4, MemOperand(frame_pointer(), kRegisterOutput)); |
| // Increment success counter. |
| __ AddP(r2, Operand(1)); |
| __ StoreP(r2, 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. |
| __ SubP(r3, Operand(num_saved_registers_)); |
| // Check whether we have enough room for another set of capture results. |
| __ CmpP(r3, Operand(num_saved_registers_)); |
| __ blt(&return_r2); |
| |
| __ StoreP(r3, MemOperand(frame_pointer(), kNumOutputRegisters)); |
| // Advance the location for output. |
| __ AddP(r4, Operand(num_saved_registers_ * kIntSize)); |
| __ StoreP(r4, MemOperand(frame_pointer(), kRegisterOutput)); |
| |
| // Prepare r2 to initialize registers with its value in the next run. |
| __ LoadP(r2, MemOperand(frame_pointer(), kStringStartMinusOne)); |
| |
| if (global_with_zero_length_check()) { |
| // Special case for zero-length matches. |
| // r6: capture start index |
| __ CmpP(current_input_offset(), r6); |
| // Not a zero-length match, restart. |
| __ bne(&load_char_start_regexp); |
| // Offset from the end is zero if we already reached the end. |
| __ CmpP(current_input_offset(), Operand::Zero()); |
| __ beq(&exit_label_); |
| // Advance current position after a zero-length match. |
| Label advance; |
| __ bind(&advance); |
| __ AddP(current_input_offset(), Operand((mode_ == UC16) ? 2 : 1)); |
| if (global_unicode()) CheckNotInSurrogatePair(0, &advance); |
| } |
| |
| __ b(&load_char_start_regexp); |
| } else { |
| __ LoadImmP(r2, Operand(SUCCESS)); |
| } |
| } |
| |
| // Exit and return r2 |
| __ bind(&exit_label_); |
| if (global()) { |
| __ LoadP(r2, MemOperand(frame_pointer(), kSuccessfulCaptures)); |
| } |
| |
| __ bind(&return_r2); |
| // Skip sp past regexp registers and local variables.. |
| __ LoadRR(sp, frame_pointer()); |
| // Restore registers r6..r15. |
| __ LoadMultipleP(r6, sp, MemOperand(sp, 6 * kPointerSize)); |
| |
| __ b(r14); |
| |
| // 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(r2); |
| __ CmpP(r2, Operand::Zero()); |
| // If returning non-zero, we should end execution with the given |
| // result as return value. |
| __ bne(&return_r2); |
| |
| // String might have moved: Reload end of string from frame. |
| __ LoadP(end_of_input_address(), MemOperand(frame_pointer(), kInputEnd)); |
| SafeReturn(); |
| } |
| |
| // Backtrack stack overflow code. |
| if (stack_overflow_label_.is_linked()) { |
| SafeCallTarget(&stack_overflow_label_); |
| // Reached if the backtrack-stack limit has been hit. |
| Label grow_failed; |
| |
| // Call GrowStack(backtrack_stackpointer(), &stack_base) |
| static const int num_arguments = 3; |
| __ PrepareCallCFunction(num_arguments, r2); |
| __ LoadRR(r2, backtrack_stackpointer()); |
| __ AddP(r3, frame_pointer(), Operand(kStackHighEnd)); |
| __ mov(r4, Operand(ExternalReference::isolate_address(isolate()))); |
| ExternalReference grow_stack = ExternalReference::re_grow_stack(isolate()); |
| __ CallCFunction(grow_stack, num_arguments); |
| // If return nullptr, we have failed to grow the stack, and |
| // must exit with a stack-overflow exception. |
| __ CmpP(r2, Operand::Zero()); |
| __ beq(&exit_with_exception); |
| // Otherwise use return value as new stack pointer. |
| __ LoadRR(backtrack_stackpointer(), r2); |
| // 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. |
| __ LoadImmP(r2, Operand(EXCEPTION)); |
| __ b(&return_r2); |
| } |
| |
| CodeDesc code_desc; |
| masm_->GetCode(isolate(), &code_desc); |
| Handle<Code> code = isolate()->factory()->NewCode(code_desc, Code::REGEXP, |
| masm_->CodeObject()); |
| PROFILE(masm_->isolate(), |
| RegExpCodeCreateEvent(AbstractCode::cast(*code), *source)); |
| return Handle<HeapObject>::cast(code); |
| } |
| |
| void RegExpMacroAssemblerS390::GoTo(Label* to) { BranchOrBacktrack(al, to); } |
| |
| void RegExpMacroAssemblerS390::IfRegisterGE(int reg, int comparand, |
| Label* if_ge) { |
| __ LoadP(r2, register_location(reg), r0); |
| __ CmpP(r2, Operand(comparand)); |
| BranchOrBacktrack(ge, if_ge); |
| } |
| |
| void RegExpMacroAssemblerS390::IfRegisterLT(int reg, int comparand, |
| Label* if_lt) { |
| __ LoadP(r2, register_location(reg), r0); |
| __ CmpP(r2, Operand(comparand)); |
| BranchOrBacktrack(lt, if_lt); |
| } |
| |
| void RegExpMacroAssemblerS390::IfRegisterEqPos(int reg, Label* if_eq) { |
| __ LoadP(r2, register_location(reg), r0); |
| __ CmpP(r2, current_input_offset()); |
| BranchOrBacktrack(eq, if_eq); |
| } |
| |
| RegExpMacroAssembler::IrregexpImplementation |
| RegExpMacroAssemblerS390::Implementation() { |
| return kS390Implementation; |
| } |
| |
| void RegExpMacroAssemblerS390::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 RegExpMacroAssemblerS390::PopCurrentPosition() { |
| Pop(current_input_offset()); |
| } |
| |
| void RegExpMacroAssemblerS390::PopRegister(int register_index) { |
| Pop(r2); |
| __ StoreP(r2, register_location(register_index)); |
| } |
| |
| void RegExpMacroAssemblerS390::PushBacktrack(Label* label) { |
| if (label->is_bound()) { |
| int target = label->pos(); |
| __ mov(r2, Operand(target + Code::kHeaderSize - kHeapObjectTag)); |
| } else { |
| masm_->load_label_offset(r2, label); |
| } |
| Push(r2); |
| CheckStackLimit(); |
| } |
| |
| void RegExpMacroAssemblerS390::PushCurrentPosition() { |
| Push(current_input_offset()); |
| } |
| |
| void RegExpMacroAssemblerS390::PushRegister(int register_index, |
| StackCheckFlag check_stack_limit) { |
| __ LoadP(r2, register_location(register_index), r0); |
| Push(r2); |
| if (check_stack_limit) CheckStackLimit(); |
| } |
| |
| void RegExpMacroAssemblerS390::ReadCurrentPositionFromRegister(int reg) { |
| __ LoadP(current_input_offset(), register_location(reg), r0); |
| } |
| |
| void RegExpMacroAssemblerS390::ReadStackPointerFromRegister(int reg) { |
| __ LoadP(backtrack_stackpointer(), register_location(reg), r0); |
| __ LoadP(r2, MemOperand(frame_pointer(), kStackHighEnd)); |
| __ AddP(backtrack_stackpointer(), r2); |
| } |
| |
| void RegExpMacroAssemblerS390::SetCurrentPositionFromEnd(int by) { |
| Label after_position; |
| __ CmpP(current_input_offset(), Operand(-by * char_size())); |
| __ bge(&after_position); |
| __ mov(current_input_offset(), Operand(-by * char_size())); |
| // On RegExp code entry (where this operation is used), the character before |
| // the current position is expected to be already loaded. |
| // We have advanced the position, so it's safe to read backwards. |
| LoadCurrentCharacterUnchecked(-1, 1); |
| __ bind(&after_position); |
| } |
| |
| void RegExpMacroAssemblerS390::SetRegister(int register_index, int to) { |
| DCHECK(register_index >= num_saved_registers_); // Reserved for positions! |
| __ mov(r2, Operand(to)); |
| __ StoreP(r2, register_location(register_index)); |
| } |
| |
| bool RegExpMacroAssemblerS390::Succeed() { |
| __ b(&success_label_); |
| return global(); |
| } |
| |
| void RegExpMacroAssemblerS390::WriteCurrentPositionToRegister(int reg, |
| int cp_offset) { |
| if (cp_offset == 0) { |
| __ StoreP(current_input_offset(), register_location(reg)); |
| } else { |
| __ AddP(r2, current_input_offset(), Operand(cp_offset * char_size())); |
| __ StoreP(r2, register_location(reg)); |
| } |
| } |
| |
| void RegExpMacroAssemblerS390::ClearRegisters(int reg_from, int reg_to) { |
| DCHECK(reg_from <= reg_to); |
| __ LoadP(r2, MemOperand(frame_pointer(), kStringStartMinusOne)); |
| for (int reg = reg_from; reg <= reg_to; reg++) { |
| __ StoreP(r2, register_location(reg)); |
| } |
| } |
| |
| void RegExpMacroAssemblerS390::WriteStackPointerToRegister(int reg) { |
| __ LoadP(r3, MemOperand(frame_pointer(), kStackHighEnd)); |
| __ SubP(r2, backtrack_stackpointer(), r3); |
| __ StoreP(r2, register_location(reg)); |
| } |
| |
| // Private methods: |
| |
| void RegExpMacroAssemblerS390::CallCheckStackGuardState(Register scratch) { |
| static const int num_arguments = 3; |
| __ PrepareCallCFunction(num_arguments, scratch); |
| // RegExp code frame pointer. |
| __ LoadRR(r4, frame_pointer()); |
| // Code* of self. |
| __ mov(r3, Operand(masm_->CodeObject())); |
| // r2 becomes return address pointer. |
| __ lay(r2, MemOperand(sp, kStackFrameRASlot * kPointerSize)); |
| ExternalReference stack_guard_check = |
| ExternalReference::re_check_stack_guard_state(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) { |
| DCHECK_EQ(kPointerSize, sizeof(T)); |
| #ifdef V8_TARGET_ARCH_S390X |
| return reinterpret_cast<T&>(Memory::uint64_at(re_frame + frame_offset)); |
| #else |
| return reinterpret_cast<T&>(Memory::uint32_at(re_frame + frame_offset)); |
| #endif |
| } |
| |
| template <typename T> |
| static T* frame_entry_address(Address re_frame, int frame_offset) { |
| return reinterpret_cast<T*>(re_frame + frame_offset); |
| } |
| |
| int RegExpMacroAssemblerS390::CheckStackGuardState(Address* return_address, |
| Code* re_code, |
| Address re_frame) { |
| return NativeRegExpMacroAssembler::CheckStackGuardState( |
| frame_entry<Isolate*>(re_frame, kIsolate), |
| frame_entry<intptr_t>(re_frame, kStartIndex), |
| frame_entry<intptr_t>(re_frame, kDirectCall) == 1, return_address, |
| re_code, frame_entry_address<String*>(re_frame, kInputString), |
| frame_entry_address<const byte*>(re_frame, kInputStart), |
| frame_entry_address<const byte*>(re_frame, kInputEnd)); |
| } |
| |
| MemOperand RegExpMacroAssemblerS390::register_location(int register_index) { |
| DCHECK(register_index < (1 << 30)); |
| if (num_registers_ <= register_index) { |
| num_registers_ = register_index + 1; |
| } |
| return MemOperand(frame_pointer(), |
| kRegisterZero - register_index * kPointerSize); |
| } |
| |
| void RegExpMacroAssemblerS390::CheckPosition(int cp_offset, |
| Label* on_outside_input) { |
| if (cp_offset >= 0) { |
| __ CmpP(current_input_offset(), Operand(-cp_offset * char_size())); |
| BranchOrBacktrack(ge, on_outside_input); |
| } else { |
| __ LoadP(r3, MemOperand(frame_pointer(), kStringStartMinusOne)); |
| __ AddP(r2, current_input_offset(), Operand(cp_offset * char_size())); |
| __ CmpP(r2, r3); |
| BranchOrBacktrack(le, on_outside_input); |
| } |
| } |
| |
| void RegExpMacroAssemblerS390::BranchOrBacktrack(Condition condition, Label* to, |
| CRegister cr) { |
| if (condition == al) { // Unconditional. |
| if (to == nullptr) { |
| Backtrack(); |
| return; |
| } |
| __ b(to); |
| return; |
| } |
| if (to == nullptr) { |
| __ b(condition, &backtrack_label_); |
| return; |
| } |
| __ b(condition, to); |
| } |
| |
| void RegExpMacroAssemblerS390::SafeCall(Label* to, Condition cond, |
| CRegister cr) { |
| Label skip; |
| __ b(NegateCondition(cond), &skip); |
| __ b(r14, to); |
| __ bind(&skip); |
| } |
| |
| void RegExpMacroAssemblerS390::SafeReturn() { |
| __ pop(r14); |
| __ mov(ip, Operand(masm_->CodeObject())); |
| __ AddP(r14, ip); |
| __ Ret(); |
| } |
| |
| void RegExpMacroAssemblerS390::SafeCallTarget(Label* name) { |
| __ bind(name); |
| __ CleanseP(r14); |
| __ LoadRR(r0, r14); |
| __ mov(ip, Operand(masm_->CodeObject())); |
| __ SubP(r0, r0, ip); |
| __ push(r0); |
| } |
| |
| void RegExpMacroAssemblerS390::Push(Register source) { |
| DCHECK(source != backtrack_stackpointer()); |
| __ lay(backtrack_stackpointer(), |
| MemOperand(backtrack_stackpointer(), -kPointerSize)); |
| __ StoreP(source, MemOperand(backtrack_stackpointer())); |
| } |
| |
| void RegExpMacroAssemblerS390::Pop(Register target) { |
| DCHECK(target != backtrack_stackpointer()); |
| __ LoadP(target, MemOperand(backtrack_stackpointer())); |
| __ la(backtrack_stackpointer(), |
| MemOperand(backtrack_stackpointer(), kPointerSize)); |
| } |
| |
| void RegExpMacroAssemblerS390::CheckPreemption() { |
| // Check for preemption. |
| ExternalReference stack_limit = |
| ExternalReference::address_of_stack_limit(isolate()); |
| __ mov(r2, Operand(stack_limit)); |
| __ CmpLogicalP(sp, MemOperand(r2)); |
| SafeCall(&check_preempt_label_, le); |
| } |
| |
| void RegExpMacroAssemblerS390::CheckStackLimit() { |
| ExternalReference stack_limit = |
| ExternalReference::address_of_regexp_stack_limit(isolate()); |
| __ mov(r2, Operand(stack_limit)); |
| __ CmpLogicalP(backtrack_stackpointer(), MemOperand(r2)); |
| SafeCall(&stack_overflow_label_, le); |
| } |
| |
| void RegExpMacroAssemblerS390::CallCFunctionUsingStub( |
| ExternalReference function, int num_arguments) { |
| // Must pass all arguments in registers. The stub pushes on the stack. |
| DCHECK_GE(8, num_arguments); |
| __ mov(code_pointer(), Operand(function)); |
| Label ret; |
| __ larl(r14, &ret); |
| __ StoreP(r14, MemOperand(sp, kStackFrameRASlot * kPointerSize)); |
| __ b(code_pointer()); |
| __ bind(&ret); |
| if (base::OS::ActivationFrameAlignment() > kPointerSize) { |
| __ LoadP(sp, MemOperand(sp, (kNumRequiredStackFrameSlots * kPointerSize))); |
| } else { |
| __ la(sp, MemOperand(sp, (kNumRequiredStackFrameSlots * kPointerSize))); |
| } |
| __ mov(code_pointer(), Operand(masm_->CodeObject())); |
| } |
| |
| |
| void RegExpMacroAssemblerS390::LoadCurrentCharacterUnchecked(int cp_offset, |
| int characters) { |
| if (mode_ == LATIN1) { |
| // using load reverse for big-endian platforms |
| if (characters == 4) { |
| #if V8_TARGET_LITTLE_ENDIAN |
| __ LoadlW(current_character(), |
| MemOperand(current_input_offset(), end_of_input_address(), |
| cp_offset * char_size())); |
| #else |
| __ LoadLogicalReversedWordP(current_character(), |
| MemOperand(current_input_offset(), end_of_input_address(), |
| cp_offset * char_size())); |
| #endif |
| } else if (characters == 2) { |
| #if V8_TARGET_LITTLE_ENDIAN |
| __ LoadLogicalHalfWordP(current_character(), |
| MemOperand(current_input_offset(), end_of_input_address(), |
| cp_offset * char_size())); |
| #else |
| __ LoadLogicalReversedHalfWordP(current_character(), |
| MemOperand(current_input_offset(), end_of_input_address(), |
| cp_offset * char_size())); |
| #endif |
| } else { |
| DCHECK_EQ(1, characters); |
| __ LoadlB(current_character(), |
| MemOperand(current_input_offset(), end_of_input_address(), |
| cp_offset * char_size())); |
| } |
| } else { |
| DCHECK(mode_ == UC16); |
| if (characters == 2) { |
| __ LoadlW(current_character(), |
| MemOperand(current_input_offset(), end_of_input_address(), |
| cp_offset * char_size())); |
| #if !V8_TARGET_LITTLE_ENDIAN |
| // need to swap the order of the characters for big-endian platforms |
| __ rll(current_character(), current_character(), Operand(16)); |
| #endif |
| } else { |
| DCHECK_EQ(1, characters); |
| __ LoadLogicalHalfWordP( |
| current_character(), |
| MemOperand(current_input_offset(), end_of_input_address(), |
| cp_offset * char_size())); |
| } |
| } |
| } |
| |
| #undef __ |
| |
| #endif // V8_INTERPRETED_REGEXP |
| } // namespace internal |
| } // namespace v8 |
| |
| #endif // V8_TARGET_ARCH_S390 |
