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regexp-macro-assembler-ppc.cc
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regexp-macro-assembler-ppc.cc
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// Copyright 2014 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#if V8_TARGET_ARCH_PPC
#include "src/regexp/ppc/regexp-macro-assembler-ppc.h"
#include "src/base/bits.h"
#include "src/codegen/assembler-inl.h"
#include "src/codegen/macro-assembler.h"
#include "src/logging/log.h"
#include "src/regexp/regexp-macro-assembler.h"
#include "src/regexp/regexp-stack.h"
#include "src/snapshot/embedded/embedded-data.h"
#include "src/strings/unicode.h"
namespace v8 {
namespace internal {
/*
* This assembler uses the following register assignment convention
* - r25: Temporarily stores the index of capture start after a matching pass
* for a global regexp.
* - r26: Pointer to current Code object including heap object tag.
* - r27: Current position in input, as negative offset from end of string.
* Please notice that this is the byte offset, not the character offset!
* - r28: Currently loaded character. Must be loaded using
* LoadCurrentCharacter before using any of the dispatch methods.
* - r29: Points to tip of backtrack stack
* - r30: End of input (points to byte after last character in input).
* - r31: Frame pointer. Used to access arguments, local variables and
* RegExp registers.
* - r12: IP register, used by assembler. Very volatile.
* - r1/sp : Points to tip of C stack.
*
* The remaining registers are free for computations.
* Each call to a public method should retain this convention.
*
* The stack will have the following structure:
* - fp[40] Isolate* isolate (address of the current isolate)
* - fp[36] lr save area (currently unused)
* - fp[32] backchain (currently unused)
* --- sp when called ---
* - fp[28] return address (lr).
* - fp[24] old frame pointer (r31).
* - fp[0..20] backup of registers r25..r30
* --- frame pointer ----
* - fp[-4] direct_call (if 1, direct call from JavaScript code,
* if 0, call through the runtime system).
* - fp[-8] stack_area_base (high end of the memory area to use as
* backtracking stack).
* - fp[-12] capture array size (may fit multiple sets of matches)
* - fp[-16] int* capture_array (int[num_saved_registers_], for output).
* - fp[-20] end of input (address of end of string).
* - fp[-24] start of input (address of first character in string).
* - fp[-28] start index (character index of start).
* - fp[-32] void* input_string (location of a handle containing the string).
* - fp[-36] success counter (only for global regexps to count matches).
* - fp[-40] Offset of location before start of input (effectively character
* string start - 1). Used to initialize capture registers to a
* non-position.
* - fp[-44] At start (if 1, we are starting at the start of the
* string, otherwise 0)
* - fp[-48] register 0 (Only positions must be stored in the first
* - register 1 num_saved_registers_ registers)
* - ...
* - register num_registers-1
* --- sp ---
*
* The first num_saved_registers_ registers are initialized to point to
* "character -1" in the string (i.e., char_size() bytes before the first
* character of the string). The remaining registers start out as garbage.
*
* The data up to the return address must be placed there by the calling
* code and the remaining arguments are passed in registers, e.g. by calling the
* code entry as cast to a function with the signature:
* int (*match)(String input_string,
* int start_index,
* Address start,
* Address end,
* int* capture_output_array,
* 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_)
const int RegExpMacroAssemblerPPC::kRegExpCodeSize;
RegExpMacroAssemblerPPC::RegExpMacroAssemblerPPC(Isolate* isolate, Zone* zone,
Mode mode,
int registers_to_save)
: NativeRegExpMacroAssembler(isolate, zone),
masm_(new MacroAssembler(isolate, CodeObjectRequired::kYes,
NewAssemblerBuffer(kRegExpCodeSize))),
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_);
__ li(r3, Operand(FAILURE));
__ Ret();
__ bind(&start_label_); // And then continue from here.
}
RegExpMacroAssemblerPPC::~RegExpMacroAssemblerPPC() {
delete masm_;
// Unuse labels in case we throw away the assembler without calling GetCode.
entry_label_.Unuse();
start_label_.Unuse();
success_label_.Unuse();
backtrack_label_.Unuse();
exit_label_.Unuse();
check_preempt_label_.Unuse();
stack_overflow_label_.Unuse();
internal_failure_label_.Unuse();
}
int RegExpMacroAssemblerPPC::stack_limit_slack() {
return RegExpStack::kStackLimitSlack;
}
void RegExpMacroAssemblerPPC::AdvanceCurrentPosition(int by) {
if (by != 0) {
if (is_int16(by * char_size())) {
__ addi(current_input_offset(), current_input_offset(),
Operand(by * char_size()));
} else {
__ mov(r0, Operand(by * char_size()));
__ add(current_input_offset(), r0, current_input_offset());
}
}
}
void RegExpMacroAssemblerPPC::AdvanceRegister(int reg, int by) {
DCHECK_LE(0, reg);
DCHECK_GT(num_registers_, reg);
if (by != 0) {
__ LoadP(r3, register_location(reg), r0);
__ mov(r0, Operand(by));
__ add(r3, r3, r0);
__ StoreP(r3, register_location(reg), r0);
}
}
void RegExpMacroAssemblerPPC::Backtrack() {
CheckPreemption();
// Pop Code offset from backtrack stack, add Code and jump to location.
Pop(r3);
__ add(r3, r3, code_pointer());
__ Jump(r3);
}
void RegExpMacroAssemblerPPC::Bind(Label* label) { __ bind(label); }
void RegExpMacroAssemblerPPC::CheckCharacter(uint32_t c, Label* on_equal) {
__ Cmpli(current_character(), Operand(c), r0);
BranchOrBacktrack(eq, on_equal);
}
void RegExpMacroAssemblerPPC::CheckCharacterGT(uc16 limit, Label* on_greater) {
__ Cmpli(current_character(), Operand(limit), r0);
BranchOrBacktrack(gt, on_greater);
}
void RegExpMacroAssemblerPPC::CheckAtStart(int cp_offset, Label* on_at_start) {
__ LoadP(r4, MemOperand(frame_pointer(), kStringStartMinusOne));
__ addi(r3, current_input_offset(),
Operand(-char_size() + cp_offset * char_size()));
__ cmp(r3, r4);
BranchOrBacktrack(eq, on_at_start);
}
void RegExpMacroAssemblerPPC::CheckNotAtStart(int cp_offset,
Label* on_not_at_start) {
__ LoadP(r4, MemOperand(frame_pointer(), kStringStartMinusOne));
__ addi(r3, current_input_offset(),
Operand(-char_size() + cp_offset * char_size()));
__ cmp(r3, r4);
BranchOrBacktrack(ne, on_not_at_start);
}
void RegExpMacroAssemblerPPC::CheckCharacterLT(uc16 limit, Label* on_less) {
__ Cmpli(current_character(), Operand(limit), r0);
BranchOrBacktrack(lt, on_less);
}
void RegExpMacroAssemblerPPC::CheckGreedyLoop(Label* on_equal) {
Label backtrack_non_equal;
__ LoadP(r3, MemOperand(backtrack_stackpointer(), 0));
__ cmp(current_input_offset(), r3);
__ bne(&backtrack_non_equal);
__ addi(backtrack_stackpointer(), backtrack_stackpointer(),
Operand(kPointerSize));
__ bind(&backtrack_non_equal);
BranchOrBacktrack(eq, on_equal);
}
void RegExpMacroAssemblerPPC::CheckNotBackReferenceIgnoreCase(
int start_reg, bool read_backward, bool unicode, Label* on_no_match) {
Label fallthrough;
__ LoadP(r3, register_location(start_reg), r0); // Index of start of capture
__ LoadP(r4, register_location(start_reg + 1), r0); // Index of end
__ sub(r4, r4, r3, LeaveOE, SetRC); // Length of capture.
// At this point, the capture registers are either both set or both cleared.
// If the capture length is zero, then the capture is either empty or cleared.
// Fall through in both cases.
__ beq(&fallthrough, cr0);
// Check that there are enough characters left in the input.
if (read_backward) {
__ LoadP(r6, MemOperand(frame_pointer(), kStringStartMinusOne));
__ add(r6, r6, r4);
__ cmp(current_input_offset(), r6);
BranchOrBacktrack(le, on_no_match);
} else {
__ add(r0, r4, current_input_offset(), LeaveOE, SetRC);
BranchOrBacktrack(gt, on_no_match, cr0);
}
if (mode_ == LATIN1) {
Label success;
Label fail;
Label loop_check;
// r3 - offset of start of capture
// r4 - length of capture
__ add(r3, r3, end_of_input_address());
__ add(r5, end_of_input_address(), current_input_offset());
if (read_backward) {
__ sub(r5, r5, r4); // Offset by length when matching backwards.
}
__ add(r4, r3, r4);
// r3 - Address of start of capture.
// r4 - Address of end of capture
// r5 - Address of current input position.
Label loop;
__ bind(&loop);
__ lbz(r6, MemOperand(r3));
__ addi(r3, r3, Operand(char_size()));
__ lbz(r25, MemOperand(r5));
__ addi(r5, r5, Operand(char_size()));
__ cmp(r25, r6);
__ beq(&loop_check);
// Mismatch, try case-insensitive match (converting letters to lower-case).
__ ori(r6, r6, Operand(0x20)); // Convert capture character to lower-case.
__ ori(r25, r25, Operand(0x20)); // Also convert input character.
__ cmp(r25, r6);
__ bne(&fail);
__ subi(r6, r6, Operand('a'));
__ cmpli(r6, Operand('z' - 'a')); // Is r6 a lowercase letter?
__ ble(&loop_check); // In range 'a'-'z'.
// Latin-1: Check for values in range [224,254] but not 247.
__ subi(r6, r6, Operand(224 - 'a'));
__ cmpli(r6, Operand(254 - 224));
__ bgt(&fail); // Weren't Latin-1 letters.
__ cmpi(r6, Operand(247 - 224)); // Check for 247.
__ beq(&fail);
__ bind(&loop_check);
__ cmp(r3, r4);
__ blt(&loop);
__ b(&success);
__ bind(&fail);
BranchOrBacktrack(al, on_no_match);
__ bind(&success);
// Compute new value of character position after the matched part.
__ sub(current_input_offset(), r5, end_of_input_address());
if (read_backward) {
__ LoadP(r3, register_location(start_reg)); // Index of start of capture
__ LoadP(r4,
register_location(start_reg + 1)); // Index of end of capture
__ add(current_input_offset(), current_input_offset(), r3);
__ sub(current_input_offset(), current_input_offset(), r4);
}
} else {
DCHECK(mode_ == UC16);
int argument_count = 4;
__ PrepareCallCFunction(argument_count, r5);
// r3 - offset of start of capture
// r4 - length of capture
// Put arguments into arguments registers.
// Parameters are
// r3: Address byte_offset1 - Address captured substring's start.
// r4: Address byte_offset2 - Address of current character position.
// r5: size_t byte_length - length of capture in bytes(!)
// r6: Isolate* isolate or 0 if unicode flag.
// Address of start of capture.
__ add(r3, r3, end_of_input_address());
// Length of capture.
__ mr(r5, r4);
// Save length in callee-save register for use on return.
__ mr(r25, r4);
// Address of current input position.
__ add(r4, current_input_offset(), end_of_input_address());
if (read_backward) {
__ sub(r4, r4, r25);
}
// Isolate.
#ifdef V8_INTL_SUPPORT
if (unicode) {
__ li(r6, Operand::Zero());
} else // NOLINT
#endif // V8_INTL_SUPPORT
{
__ mov(r6, Operand(ExternalReference::isolate_address(isolate())));
}
{
AllowExternalCallThatCantCauseGC scope(masm_);
ExternalReference function =
ExternalReference::re_case_insensitive_compare_uc16(isolate());
__ CallCFunction(function, argument_count);
}
// Check if function returned non-zero for success or zero for failure.
__ cmpi(r3, Operand::Zero());
BranchOrBacktrack(eq, on_no_match);
// On success, advance position by length of capture.
if (read_backward) {
__ sub(current_input_offset(), current_input_offset(), r25);
} else {
__ add(current_input_offset(), current_input_offset(), r25);
}
}
__ bind(&fallthrough);
}
void RegExpMacroAssemblerPPC::CheckNotBackReference(int start_reg,
bool read_backward,
Label* on_no_match) {
Label fallthrough;
// Find length of back-referenced capture.
__ LoadP(r3, register_location(start_reg), r0);
__ LoadP(r4, register_location(start_reg + 1), r0);
__ sub(r4, r4, r3, LeaveOE, SetRC); // Length to check.
// At this point, the capture registers are either both set or both cleared.
// If the capture length is zero, then the capture is either empty or cleared.
// Fall through in both cases.
__ beq(&fallthrough, cr0);
// Check that there are enough characters left in the input.
if (read_backward) {
__ LoadP(r6, MemOperand(frame_pointer(), kStringStartMinusOne));
__ add(r6, r6, r4);
__ cmp(current_input_offset(), r6);
BranchOrBacktrack(le, on_no_match);
} else {
__ add(r0, r4, current_input_offset(), LeaveOE, SetRC);
BranchOrBacktrack(gt, on_no_match, cr0);
}
// r3 - offset of start of capture
// r4 - length of capture
__ add(r3, r3, end_of_input_address());
__ add(r5, end_of_input_address(), current_input_offset());
if (read_backward) {
__ sub(r5, r5, r4); // Offset by length when matching backwards.
}
__ add(r4, r4, r3);
Label loop;
__ bind(&loop);
if (mode_ == LATIN1) {
__ lbz(r6, MemOperand(r3));
__ addi(r3, r3, Operand(char_size()));
__ lbz(r25, MemOperand(r5));
__ addi(r5, r5, Operand(char_size()));
} else {
DCHECK(mode_ == UC16);
__ lhz(r6, MemOperand(r3));
__ addi(r3, r3, Operand(char_size()));
__ lhz(r25, MemOperand(r5));
__ addi(r5, r5, Operand(char_size()));
}
__ cmp(r6, r25);
BranchOrBacktrack(ne, on_no_match);
__ cmp(r3, r4);
__ blt(&loop);
// Move current character position to position after match.
__ sub(current_input_offset(), r5, end_of_input_address());
if (read_backward) {
__ LoadP(r3, register_location(start_reg)); // Index of start of capture
__ LoadP(r4, register_location(start_reg + 1)); // Index of end of capture
__ add(current_input_offset(), current_input_offset(), r3);
__ sub(current_input_offset(), current_input_offset(), r4);
}
__ bind(&fallthrough);
}
void RegExpMacroAssemblerPPC::CheckNotCharacter(unsigned c,
Label* on_not_equal) {
__ Cmpli(current_character(), Operand(c), r0);
BranchOrBacktrack(ne, on_not_equal);
}
void RegExpMacroAssemblerPPC::CheckCharacterAfterAnd(uint32_t c, uint32_t mask,
Label* on_equal) {
__ mov(r0, Operand(mask));
if (c == 0) {
__ and_(r3, current_character(), r0, SetRC);
} else {
__ and_(r3, current_character(), r0);
__ Cmpli(r3, Operand(c), r0, cr0);
}
BranchOrBacktrack(eq, on_equal, cr0);
}
void RegExpMacroAssemblerPPC::CheckNotCharacterAfterAnd(unsigned c,
unsigned mask,
Label* on_not_equal) {
__ mov(r0, Operand(mask));
if (c == 0) {
__ and_(r3, current_character(), r0, SetRC);
} else {
__ and_(r3, current_character(), r0);
__ Cmpli(r3, Operand(c), r0, cr0);
}
BranchOrBacktrack(ne, on_not_equal, cr0);
}
void RegExpMacroAssemblerPPC::CheckNotCharacterAfterMinusAnd(
uc16 c, uc16 minus, uc16 mask, Label* on_not_equal) {
DCHECK_GT(String::kMaxUtf16CodeUnit, minus);
__ subi(r3, current_character(), Operand(minus));
__ mov(r0, Operand(mask));
__ and_(r3, r3, r0);
__ Cmpli(r3, Operand(c), r0);
BranchOrBacktrack(ne, on_not_equal);
}
void RegExpMacroAssemblerPPC::CheckCharacterInRange(uc16 from, uc16 to,
Label* on_in_range) {
__ mov(r0, Operand(from));
__ sub(r3, current_character(), r0);
__ Cmpli(r3, Operand(to - from), r0);
BranchOrBacktrack(le, on_in_range); // Unsigned lower-or-same condition.
}
void RegExpMacroAssemblerPPC::CheckCharacterNotInRange(uc16 from, uc16 to,
Label* on_not_in_range) {
__ mov(r0, Operand(from));
__ sub(r3, current_character(), r0);
__ Cmpli(r3, Operand(to - from), r0);
BranchOrBacktrack(gt, on_not_in_range); // Unsigned higher condition.
}
void RegExpMacroAssemblerPPC::CheckBitInTable(Handle<ByteArray> table,
Label* on_bit_set) {
__ mov(r3, Operand(table));
if (mode_ != LATIN1 || kTableMask != String::kMaxOneByteCharCode) {
__ andi(r4, current_character(), Operand(kTableSize - 1));
__ addi(r4, r4, Operand(ByteArray::kHeaderSize - kHeapObjectTag));
} else {
__ addi(r4, current_character(),
Operand(ByteArray::kHeaderSize - kHeapObjectTag));
}
__ lbzx(r3, MemOperand(r3, r4));
__ cmpi(r3, Operand::Zero());
BranchOrBacktrack(ne, on_bit_set);
}
bool RegExpMacroAssemblerPPC::CheckSpecialCharacterClass(uc16 type,
Label* on_no_match) {
// Range checks (c in min..max) are generally implemented by an unsigned
// (c - min) <= (max - min) check
switch (type) {
case 's':
// Match space-characters
if (mode_ == LATIN1) {
// One byte space characters are '\t'..'\r', ' ' and \u00a0.
Label success;
__ cmpi(current_character(), Operand(' '));
__ beq(&success);
// Check range 0x09..0x0D
__ subi(r3, current_character(), Operand('\t'));
__ cmpli(r3, Operand('\r' - '\t'));
__ ble(&success);
// \u00a0 (NBSP).
__ cmpi(r3, Operand(0x00A0 - '\t'));
BranchOrBacktrack(ne, on_no_match);
__ bind(&success);
return true;
}
return false;
case 'S':
// The emitted code for generic character classes is good enough.
return false;
case 'd':
// Match ASCII digits ('0'..'9')
__ subi(r3, current_character(), Operand('0'));
__ cmpli(r3, Operand('9' - '0'));
BranchOrBacktrack(gt, on_no_match);
return true;
case 'D':
// Match non ASCII-digits
__ subi(r3, current_character(), Operand('0'));
__ cmpli(r3, Operand('9' - '0'));
BranchOrBacktrack(le, on_no_match);
return true;
case '.': {
// Match non-newlines (not 0x0A('\n'), 0x0D('\r'), 0x2028 and 0x2029)
__ xori(r3, current_character(), Operand(0x01));
// See if current character is '\n'^1 or '\r'^1, i.e., 0x0B or 0x0C
__ subi(r3, r3, Operand(0x0B));
__ cmpli(r3, Operand(0x0C - 0x0B));
BranchOrBacktrack(le, on_no_match);
if (mode_ == UC16) {
// Compare original value to 0x2028 and 0x2029, using the already
// computed (current_char ^ 0x01 - 0x0B). I.e., check for
// 0x201D (0x2028 - 0x0B) or 0x201E.
__ subi(r3, r3, Operand(0x2028 - 0x0B));
__ cmpli(r3, Operand(1));
BranchOrBacktrack(le, on_no_match);
}
return true;
}
case 'n': {
// Match newlines (0x0A('\n'), 0x0D('\r'), 0x2028 and 0x2029)
__ xori(r3, current_character(), Operand(0x01));
// See if current character is '\n'^1 or '\r'^1, i.e., 0x0B or 0x0C
__ subi(r3, r3, Operand(0x0B));
__ cmpli(r3, Operand(0x0C - 0x0B));
if (mode_ == LATIN1) {
BranchOrBacktrack(gt, on_no_match);
} else {
Label done;
__ ble(&done);
// Compare original value to 0x2028 and 0x2029, using the already
// computed (current_char ^ 0x01 - 0x0B). I.e., check for
// 0x201D (0x2028 - 0x0B) or 0x201E.
__ subi(r3, r3, Operand(0x2028 - 0x0B));
__ cmpli(r3, Operand(1));
BranchOrBacktrack(gt, on_no_match);
__ bind(&done);
}
return true;
}
case 'w': {
if (mode_ != LATIN1) {
// Table is 256 entries, so all Latin1 characters can be tested.
__ cmpi(current_character(), Operand('z'));
BranchOrBacktrack(gt, on_no_match);
}
ExternalReference map =
ExternalReference::re_word_character_map(isolate());
__ mov(r3, Operand(map));
__ lbzx(r3, MemOperand(r3, current_character()));
__ cmpli(r3, Operand::Zero());
BranchOrBacktrack(eq, on_no_match);
return true;
}
case 'W': {
Label done;
if (mode_ != LATIN1) {
// Table is 256 entries, so all Latin1 characters can be tested.
__ cmpli(current_character(), Operand('z'));
__ bgt(&done);
}
ExternalReference map =
ExternalReference::re_word_character_map(isolate());
__ mov(r3, Operand(map));
__ lbzx(r3, MemOperand(r3, current_character()));
__ cmpli(r3, Operand::Zero());
BranchOrBacktrack(ne, on_no_match);
if (mode_ != LATIN1) {
__ bind(&done);
}
return true;
}
case '*':
// Match any character.
return true;
// No custom implementation (yet): s(UC16), S(UC16).
default:
return false;
}
}
void RegExpMacroAssemblerPPC::Fail() {
__ li(r3, Operand(FAILURE));
__ b(&exit_label_);
}
Handle<HeapObject> RegExpMacroAssemblerPPC::GetCode(Handle<String> source) {
Label return_r3;
if (masm_->has_exception()) {
// If the code gets corrupted due to long regular expressions and lack of
// space on trampolines, an internal exception flag is set. If this case
// is detected, we will jump into exit sequence right away.
__ bind_to(&entry_label_, internal_failure_label_.pos());
} else {
// Finalize code - write the entry point code now we know how many
// registers we need.
// Entry code:
__ bind(&entry_label_);
// Tell the system that we have a stack frame. Because the type
// is MANUAL, no is generated.
FrameScope scope(masm_, StackFrame::MANUAL);
// Ensure register assigments are consistent with callee save mask
DCHECK(r25.bit() & kRegExpCalleeSaved);
DCHECK(code_pointer().bit() & kRegExpCalleeSaved);
DCHECK(current_input_offset().bit() & kRegExpCalleeSaved);
DCHECK(current_character().bit() & kRegExpCalleeSaved);
DCHECK(backtrack_stackpointer().bit() & kRegExpCalleeSaved);
DCHECK(end_of_input_address().bit() & kRegExpCalleeSaved);
DCHECK(frame_pointer().bit() & kRegExpCalleeSaved);
// Actually emit code to start a new stack frame.
// Push arguments
// Save callee-save registers.
// Start new stack frame.
// Store link register in existing stack-cell.
// Order here should correspond to order of offset constants in header file.
RegList registers_to_retain = kRegExpCalleeSaved;
RegList argument_registers = r3.bit() | r4.bit() | r5.bit() | r6.bit() |
r7.bit() | r8.bit() | r9.bit() | r10.bit();
__ mflr(r0);
__ push(r0);
__ MultiPush(argument_registers | registers_to_retain);
// Set frame pointer in space for it if this is not a direct call
// from generated code.
__ addi(frame_pointer(), sp, Operand(8 * kPointerSize));
__ li(r3, Operand::Zero());
__ push(r3); // Make room for success counter and initialize it to 0.
__ push(r3); // Make room for "string start - 1" constant.
// Check if we have space on the stack for registers.
Label stack_limit_hit;
Label stack_ok;
ExternalReference stack_limit =
ExternalReference::address_of_jslimit(isolate());
__ mov(r3, Operand(stack_limit));
__ LoadP(r3, MemOperand(r3));
__ sub(r3, sp, r3, LeaveOE, SetRC);
// Handle it if the stack pointer is already below the stack limit.
__ ble(&stack_limit_hit, cr0);
// Check if there is room for the variable number of registers above
// the stack limit.
__ Cmpli(r3, Operand(num_registers_ * kPointerSize), r0);
__ bge(&stack_ok);
// Exit with OutOfMemory exception. There is not enough space on the stack
// for our working registers.
__ li(r3, Operand(EXCEPTION));
__ b(&return_r3);
__ bind(&stack_limit_hit);
CallCheckStackGuardState(r3);
__ cmpi(r3, Operand::Zero());
// If returned value is non-zero, we exit with the returned value as result.
__ bne(&return_r3);
__ bind(&stack_ok);
// Allocate space on stack for registers.
__ Add(sp, sp, -num_registers_ * kPointerSize, r0);
// Load string end.
__ LoadP(end_of_input_address(), MemOperand(frame_pointer(), kInputEnd));
// Load input start.
__ LoadP(r3, MemOperand(frame_pointer(), kInputStart));
// Find negative length (offset of start relative to end).
__ sub(current_input_offset(), r3, end_of_input_address());
// Set r3 to address of char before start of the input string
// (effectively string position -1).
__ LoadP(r4, MemOperand(frame_pointer(), kStartIndex));
__ subi(r3, current_input_offset(), Operand(char_size()));
if (mode_ == UC16) {
__ ShiftLeftImm(r0, r4, Operand(1));
__ sub(r3, r3, r0);
} else {
__ sub(r3, r3, r4);
}
// Store this value in a local variable, for use when clearing
// position registers.
__ StoreP(r3, MemOperand(frame_pointer(), kStringStartMinusOne));
// Initialize code pointer register
__ mov(code_pointer(), Operand(masm_->CodeObject()));
Label load_char_start_regexp, start_regexp;
// Load newline if index is at start, previous character otherwise.
__ cmpi(r4, Operand::Zero());
__ bne(&load_char_start_regexp);
__ li(current_character(), Operand('\n'));
__ b(&start_regexp);
// Global regexp restarts matching here.
__ bind(&load_char_start_regexp);
// Load previous char as initial value of current character register.
LoadCurrentCharacterUnchecked(-1, 1);
__ bind(&start_regexp);
// Initialize on-stack registers.
if (num_saved_registers_ > 0) { // Always is, if generated from a regexp.
// Fill saved registers with initial value = start offset - 1
if (num_saved_registers_ > 8) {
// One slot beyond address of register 0.
__ addi(r4, frame_pointer(), Operand(kRegisterZero + kPointerSize));
__ mov(r5, Operand(num_saved_registers_));
__ mtctr(r5);
Label init_loop;
__ bind(&init_loop);
__ StorePU(r3, MemOperand(r4, -kPointerSize));
__ bdnz(&init_loop);
} else {
for (int i = 0; i < num_saved_registers_; i++) {
__ StoreP(r3, register_location(i), r0);
}
}
}
// Initialize backtrack stack pointer.
__ LoadP(backtrack_stackpointer(),
MemOperand(frame_pointer(), kStackHighEnd));
__ b(&start_label_);
// Exit code:
if (success_label_.is_linked()) {
// Save captures when successful.
__ bind(&success_label_);
if (num_saved_registers_ > 0) {
// copy captures to output
__ LoadP(r4, MemOperand(frame_pointer(), kInputStart));
__ LoadP(r3, MemOperand(frame_pointer(), kRegisterOutput));
__ LoadP(r5, MemOperand(frame_pointer(), kStartIndex));
__ sub(r4, end_of_input_address(), r4);
// r4 is length of input in bytes.
if (mode_ == UC16) {
__ ShiftRightImm(r4, r4, Operand(1));
}
// r4 is length of input in characters.
__ add(r4, r4, r5);
// r4 is length of string in characters.
DCHECK_EQ(0, num_saved_registers_ % 2);
// Always an even number of capture registers. This allows us to
// unroll the loop once to add an operation between a load of a register
// and the following use of that register.
for (int i = 0; i < num_saved_registers_; i += 2) {
__ LoadP(r5, register_location(i), r0);
__ LoadP(r6, register_location(i + 1), r0);
if (i == 0 && global_with_zero_length_check()) {
// Keep capture start in r25 for the zero-length check later.
__ mr(r25, r5);
}
if (mode_ == UC16) {
__ ShiftRightArithImm(r5, r5, 1);
__ add(r5, r4, r5);
__ ShiftRightArithImm(r6, r6, 1);
__ add(r6, r4, r6);
} else {
__ add(r5, r4, r5);
__ add(r6, r4, r6);
}
__ stw(r5, MemOperand(r3));
__ addi(r3, r3, Operand(kIntSize));
__ stw(r6, MemOperand(r3));
__ addi(r3, r3, Operand(kIntSize));
}
}
if (global()) {
// Restart matching if the regular expression is flagged as global.
__ LoadP(r3, MemOperand(frame_pointer(), kSuccessfulCaptures));
__ LoadP(r4, MemOperand(frame_pointer(), kNumOutputRegisters));
__ LoadP(r5, MemOperand(frame_pointer(), kRegisterOutput));
// Increment success counter.
__ addi(r3, r3, Operand(1));
__ StoreP(r3, MemOperand(frame_pointer(), kSuccessfulCaptures));
// Capture results have been stored, so the number of remaining global
// output registers is reduced by the number of stored captures.
__ subi(r4, r4, Operand(num_saved_registers_));
// Check whether we have enough room for another set of capture results.
__ cmpi(r4, Operand(num_saved_registers_));
__ blt(&return_r3);
__ StoreP(r4, MemOperand(frame_pointer(), kNumOutputRegisters));
// Advance the location for output.
__ addi(r5, r5, Operand(num_saved_registers_ * kIntSize));
__ StoreP(r5, MemOperand(frame_pointer(), kRegisterOutput));
// Prepare r3 to initialize registers with its value in the next run.
__ LoadP(r3, MemOperand(frame_pointer(), kStringStartMinusOne));
if (global_with_zero_length_check()) {
// Special case for zero-length matches.
// r25: capture start index
__ cmp(current_input_offset(), r25);
// Not a zero-length match, restart.
__ bne(&load_char_start_regexp);
// Offset from the end is zero if we already reached the end.
__ cmpi(current_input_offset(), Operand::Zero());
__ beq(&exit_label_);
// Advance current position after a zero-length match.
Label advance;
__ bind(&advance);
__ addi(current_input_offset(), current_input_offset(),
Operand((mode_ == UC16) ? 2 : 1));
if (global_unicode()) CheckNotInSurrogatePair(0, &advance);
}
__ b(&load_char_start_regexp);
} else {
__ li(r3, Operand(SUCCESS));
}
}
// Exit and return r3
__ bind(&exit_label_);
if (global()) {
__ LoadP(r3, MemOperand(frame_pointer(), kSuccessfulCaptures));
}
__ bind(&return_r3);
// Skip sp past regexp registers and local variables..
__ mr(sp, frame_pointer());
// Restore registers r25..r31 and return (restoring lr to pc).
__ MultiPop(registers_to_retain);
__ pop(r0);
__ mtlr(r0);
__ blr();
// Backtrack code (branch target for conditional backtracks).
if (backtrack_label_.is_linked()) {
__ bind(&backtrack_label_);
Backtrack();
}
Label exit_with_exception;
// Preempt-code
if (check_preempt_label_.is_linked()) {
SafeCallTarget(&check_preempt_label_);
CallCheckStackGuardState(r3);
__ cmpi(r3, Operand::Zero());
// If returning non-zero, we should end execution with the given
// result as return value.
__ bne(&return_r3);
// String might have moved: Reload end of string from frame.
__ LoadP(end_of_input_address(), MemOperand(frame_pointer(), kInputEnd));
SafeReturn();
}
// Backtrack stack overflow code.
if (stack_overflow_label_.is_linked()) {
SafeCallTarget(&stack_overflow_label_);
// Call GrowStack(backtrack_stackpointer(), &stack_base)
static const int num_arguments = 3;
__ PrepareCallCFunction(num_arguments, r3);
__ mr(r3, backtrack_stackpointer());
__ addi(r4, frame_pointer(), Operand(kStackHighEnd));
__ mov(r5, Operand(ExternalReference::isolate_address(isolate())));
ExternalReference grow_stack =
ExternalReference::re_grow_stack(isolate());
__ CallCFunction(grow_stack, num_arguments);
// If return nullptr, we have failed to grow the stack, and
// must exit with a stack-overflow exception.
__ cmpi(r3, Operand::Zero());
__ beq(&exit_with_exception);
// Otherwise use return value as new stack pointer.
__ mr(backtrack_stackpointer(), r3);
// Restore saved registers and continue.
SafeReturn();
}
if (exit_with_exception.is_linked()) {
// If any of the code above needed to exit with an exception.
__ bind(&exit_with_exception);
// Exit with Result EXCEPTION(-1) to signal thrown exception.
__ li(r3, Operand(EXCEPTION));
__ b(&return_r3);
}
}
CodeDesc code_desc;
masm_->GetCode(isolate(), &code_desc);
Handle<Code> code = Factory::CodeBuilder(isolate(), code_desc, Code::REGEXP)
.set_self_reference(masm_->CodeObject())
.Build();
PROFILE(masm_->isolate(),
RegExpCodeCreateEvent(AbstractCode::cast(*code), *source));
return Handle<HeapObject>::cast(code);
}
void RegExpMacroAssemblerPPC::GoTo(Label* to) { BranchOrBacktrack(al, to); }
void RegExpMacroAssemblerPPC::IfRegisterGE(int reg, int comparand,
Label* if_ge) {
__ LoadP(r3, register_location(reg), r0);
__ Cmpi(r3, Operand(comparand), r0);
BranchOrBacktrack(ge, if_ge);
}
void RegExpMacroAssemblerPPC::IfRegisterLT(int reg, int comparand,
Label* if_lt) {
__ LoadP(r3, register_location(reg), r0);
__ Cmpi(r3, Operand(comparand), r0);
BranchOrBacktrack(lt, if_lt);
}
void RegExpMacroAssemblerPPC::IfRegisterEqPos(int reg, Label* if_eq) {
__ LoadP(r3, register_location(reg), r0);
__ cmp(r3, current_input_offset());
BranchOrBacktrack(eq, if_eq);
}
RegExpMacroAssembler::IrregexpImplementation
RegExpMacroAssemblerPPC::Implementation() {
return kPPCImplementation;
}
void RegExpMacroAssemblerPPC::LoadCurrentCharacterImpl(int cp_offset,
Label* on_end_of_input,
bool check_bounds,
int characters,
int eats_at_least) {
// It's possible to preload a small number of characters when each success
// path requires a large number of characters, but not the reverse.
DCHECK_GE(eats_at_least, characters);
DCHECK(cp_offset < (1 << 30)); // Be sane! (And ensure negation works)
if (check_bounds) {
if (cp_offset >= 0) {
CheckPosition(cp_offset + eats_at_least - 1, on_end_of_input);
} else {
CheckPosition(cp_offset, on_end_of_input);
}
}
LoadCurrentCharacterUnchecked(cp_offset, characters);
}
void RegExpMacroAssemblerPPC::PopCurrentPosition() {
Pop(current_input_offset());
}