260cd876d1
JSCRE now is to use the --noirregexp flag. Also add code to check that we react sensibly to some very large regexps. Review URL: http://codereview.chromium.org/18587 git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@1166 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
231 lines
10 KiB
C++
231 lines
10 KiB
C++
// Copyright 2008 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.
|
|
|
|
#ifndef V8_REGEXP_MACRO_ASSEMBLER_H_
|
|
#define V8_REGEXP_MACRO_ASSEMBLER_H_
|
|
|
|
namespace v8 { namespace internal {
|
|
|
|
struct DisjunctDecisionRow {
|
|
RegExpCharacterClass cc;
|
|
Label* on_match;
|
|
};
|
|
|
|
|
|
class RegExpMacroAssembler {
|
|
public:
|
|
// The implementation must be able to handle at least:
|
|
static const int kMaxRegister = (1 << 16) - 1;
|
|
static const int kMaxCPOffset = (1 << 15) - 1;
|
|
static const int kMinCPOffset = -(1 << 15);
|
|
enum IrregexpImplementation {
|
|
kIA32Implementation,
|
|
kARMImplementation,
|
|
kBytecodeImplementation
|
|
};
|
|
|
|
enum StackCheckFlag {
|
|
kNoStackLimitCheck = false,
|
|
kCheckStackLimit = true
|
|
};
|
|
|
|
RegExpMacroAssembler();
|
|
virtual ~RegExpMacroAssembler();
|
|
// The maximal number of pushes between stack checks. Users must supply
|
|
// kCheckStackLimit flag to push operations (instead of kNoStackLimitCheck)
|
|
// at least once for every stack_limit() pushes that are executed.
|
|
virtual int stack_limit_slack() = 0;
|
|
virtual void AdvanceCurrentPosition(int by) = 0; // Signed cp change.
|
|
virtual void AdvanceRegister(int reg, int by) = 0; // r[reg] += by.
|
|
// Continues execution from the position pushed on the top of the backtrack
|
|
// stack by an earlier PushBacktrack(Label*).
|
|
virtual void Backtrack() = 0;
|
|
virtual void Bind(Label* label) = 0;
|
|
virtual void CheckAtStart(Label* on_at_start) = 0;
|
|
// Check the current character against a bitmap. The range of the current
|
|
// character must be from start to start + length_of_bitmap_in_bits.
|
|
virtual void CheckBitmap(
|
|
uc16 start, // The bitmap is indexed from this character.
|
|
Label* bitmap, // Where the bitmap is emitted.
|
|
Label* on_zero) = 0; // Where to go if the bit is 0. Fall through on 1.
|
|
// Dispatch after looking the current character up in a 2-bits-per-entry
|
|
// map. The destinations vector has up to 4 labels.
|
|
virtual void CheckCharacter(uint32_t c, Label* on_equal) = 0;
|
|
// Bitwise and the current character with the given constant and then
|
|
// check for a match with c.
|
|
virtual void CheckCharacterAfterAnd(uint32_t c,
|
|
uint32_t and_with,
|
|
Label* on_equal) = 0;
|
|
virtual void CheckCharacterGT(uc16 limit, Label* on_greater) = 0;
|
|
virtual void CheckCharacterLT(uc16 limit, Label* on_less) = 0;
|
|
// Check the current character for a match with a literal string. If we
|
|
// fail to match then goto the on_failure label. If check_eos is set then
|
|
// the end of input always fails. If check_eos is clear then it is the
|
|
// caller's responsibility to ensure that the end of string is not hit.
|
|
// If the label is NULL then we should pop a backtrack address off
|
|
// the stack and go to that.
|
|
virtual void CheckCharacters(
|
|
Vector<const uc16> str,
|
|
int cp_offset,
|
|
Label* on_failure,
|
|
bool check_eos) = 0;
|
|
virtual void CheckGreedyLoop(Label* on_tos_equals_current_position) = 0;
|
|
virtual void CheckNotAtStart(Label* on_not_at_start) = 0;
|
|
virtual void CheckNotBackReference(int start_reg, Label* on_no_match) = 0;
|
|
virtual void CheckNotBackReferenceIgnoreCase(int start_reg,
|
|
Label* on_no_match) = 0;
|
|
// Check the current character for a match with a literal character. If we
|
|
// fail to match then goto the on_failure label. End of input always
|
|
// matches. If the label is NULL then we should pop a backtrack address off
|
|
// the stack and go to that.
|
|
virtual void CheckNotCharacter(uint32_t c, Label* on_not_equal) = 0;
|
|
virtual void CheckNotCharacterAfterAnd(uint32_t c,
|
|
uint32_t and_with,
|
|
Label* on_not_equal) = 0;
|
|
// Subtract a constant from the current character, then or with the given
|
|
// constant and then check for a match with c.
|
|
virtual void CheckNotCharacterAfterMinusAnd(uc16 c,
|
|
uc16 minus,
|
|
uc16 and_with,
|
|
Label* on_not_equal) = 0;
|
|
virtual void CheckNotRegistersEqual(int reg1,
|
|
int reg2,
|
|
Label* on_not_equal) = 0;
|
|
|
|
// Checks whether the given offset from the current position is before
|
|
// the end of the string. May overwrite the current character.
|
|
virtual void CheckPosition(int cp_offset, Label* on_outside_input) {
|
|
LoadCurrentCharacter(cp_offset, on_outside_input, true);
|
|
}
|
|
// Check whether a standard/default character class matches the current
|
|
// character. Returns false if the type of special character class does
|
|
// not have custom support.
|
|
// May clobber the current loaded character.
|
|
virtual bool CheckSpecialCharacterClass(uc16 type,
|
|
int cp_offset,
|
|
bool check_offset,
|
|
Label* on_no_match) {
|
|
return false;
|
|
}
|
|
// Dispatch after looking the current character up in a byte map. The
|
|
// destinations vector has up to 256 labels.
|
|
virtual void DispatchByteMap(
|
|
uc16 start,
|
|
Label* byte_map,
|
|
const Vector<Label*>& destinations) = 0;
|
|
virtual void DispatchHalfNibbleMap(
|
|
uc16 start,
|
|
Label* half_nibble_map,
|
|
const Vector<Label*>& destinations) = 0;
|
|
// Dispatch after looking the high byte of the current character up in a byte
|
|
// map. The destinations vector has up to 256 labels.
|
|
virtual void DispatchHighByteMap(
|
|
byte start,
|
|
Label* byte_map,
|
|
const Vector<Label*>& destinations) = 0;
|
|
virtual void EmitOrLink(Label* label) = 0;
|
|
virtual void Fail() = 0;
|
|
virtual Handle<Object> GetCode(Handle<String> source) = 0;
|
|
virtual void GoTo(Label* label) = 0;
|
|
// Check whether a register is >= a given constant and go to a label if it
|
|
// is. Backtracks instead if the label is NULL.
|
|
virtual void IfRegisterGE(int reg, int comparand, Label* if_ge) = 0;
|
|
// Check whether a register is < a given constant and go to a label if it is.
|
|
// Backtracks instead if the label is NULL.
|
|
virtual void IfRegisterLT(int reg, int comparand, Label* if_lt) = 0;
|
|
// Check whether a register is == to the current position and go to a
|
|
// label if it is.
|
|
virtual void IfRegisterEqPos(int reg, Label* if_eq) = 0;
|
|
virtual IrregexpImplementation Implementation() = 0;
|
|
virtual void LoadCurrentCharacter(int cp_offset,
|
|
Label* on_end_of_input,
|
|
bool check_bounds = true,
|
|
int characters = 1) = 0;
|
|
virtual void PopCurrentPosition() = 0;
|
|
virtual void PopRegister(int register_index) = 0;
|
|
// Pushes the label on the backtrack stack, so that a following Backtrack
|
|
// will go to this label. Always checks the backtrack stack limit.
|
|
virtual void PushBacktrack(Label* label) = 0;
|
|
virtual void PushCurrentPosition() = 0;
|
|
virtual void PushRegister(int register_index,
|
|
StackCheckFlag check_stack_limit) = 0;
|
|
virtual void ReadCurrentPositionFromRegister(int reg) = 0;
|
|
virtual void ReadStackPointerFromRegister(int reg) = 0;
|
|
virtual void SetRegister(int register_index, int to) = 0;
|
|
virtual void Succeed() = 0;
|
|
virtual void WriteCurrentPositionToRegister(int reg, int cp_offset) = 0;
|
|
virtual void ClearRegisters(int reg_from, int reg_to) = 0;
|
|
virtual void WriteStackPointerToRegister(int reg) = 0;
|
|
|
|
private:
|
|
};
|
|
|
|
|
|
struct ArraySlice {
|
|
public:
|
|
ArraySlice(Handle<ByteArray> array, size_t offset)
|
|
: array_(array), offset_(offset) {}
|
|
Handle<ByteArray> array() { return array_; }
|
|
// Offset in the byte array data.
|
|
size_t offset() { return offset_; }
|
|
// Offset from the ByteArray pointer.
|
|
size_t base_offset() {
|
|
return ByteArray::kHeaderSize - kHeapObjectTag + offset_;
|
|
}
|
|
void* location() {
|
|
return reinterpret_cast<void*>(array_->GetDataStartAddress() + offset_);
|
|
}
|
|
template <typename T>
|
|
T& at(int idx) {
|
|
return reinterpret_cast<T*>(array_->GetDataStartAddress() + offset_)[idx];
|
|
}
|
|
private:
|
|
Handle<ByteArray> array_;
|
|
size_t offset_;
|
|
};
|
|
|
|
|
|
class ByteArrayProvider {
|
|
public:
|
|
explicit ByteArrayProvider(unsigned int initial_size);
|
|
// Provides a place to put "size" elements of size "element_size".
|
|
// The information can be stored in the provided ByteArray at the "offset".
|
|
// The offset is aligned to the element size.
|
|
ArraySlice GetBuffer(unsigned int size,
|
|
unsigned int element_size);
|
|
template <typename T>
|
|
ArraySlice GetBuffer(Vector<T> values);
|
|
private:
|
|
size_t byte_array_size_;
|
|
Handle<ByteArray> current_byte_array_;
|
|
int current_byte_array_free_offset_;
|
|
};
|
|
|
|
} } // namespace v8::internal
|
|
|
|
#endif // V8_REGEXP_MACRO_ASSEMBLER_H_
|