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Make kAsciiDataHintTag have correct semantics for all both 1 and 2 byte string types.

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BUG=

Review URL: https://chromiumcodereview.appspot.com/11361171

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@12937 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
This commit is contained in:
yangguo@chromium.org 2012-11-12 14:57:59 +00:00
parent 693ee09cf3
commit ce884e13e3
5 changed files with 18 additions and 29 deletions
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5
src/arm/code-stubs-arm.cc
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@ -6498,11 +6498,6 @@ void StringAddStub::Generate(MacroAssembler* masm) {
__ tst(r4, Operand(kAsciiDataHintMask));
__ tst(r5, Operand(kAsciiDataHintMask), ne);
__ b(ne, &ascii_data);
__ eor(r4, r4, Operand(r5));
STATIC_ASSERT(kOneByteStringTag != 0 && kAsciiDataHintTag != 0);
__ and_(r4, r4, Operand(kOneByteStringTag | kAsciiDataHintTag));
__ cmp(r4, Operand(kOneByteStringTag | kAsciiDataHintTag));
__ b(eq, &ascii_data);
// Allocate a two byte cons string.
__ AllocateTwoByteConsString(r7, r6, r4, r5, &call_runtime);

7
src/ia32/code-stubs-ia32.cc
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@ -5748,13 +5748,6 @@ void StringAddStub::Generate(MacroAssembler* masm) {
// edi: second instance type.
__ test(ecx, Immediate(kAsciiDataHintMask));
__ j(not_zero, &ascii_data);
__ mov(ecx, FieldOperand(eax, HeapObject::kMapOffset));
__ movzx_b(ecx, FieldOperand(ecx, Map::kInstanceTypeOffset));
__ xor_(edi, ecx);
STATIC_ASSERT(kOneByteStringTag != 0 && kAsciiDataHintTag != 0);
__ and_(edi, kOneByteStringTag | kAsciiDataHintTag);
__ cmp(edi, kOneByteStringTag | kAsciiDataHintTag);
__ j(equal, &ascii_data);
// Allocate a two byte cons string.
__ AllocateTwoByteConsString(ecx, edi, no_reg, &call_runtime);
__ jmp(&allocated);

3
src/objects-inl.h
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@ -333,8 +333,7 @@ bool String::IsTwoByteRepresentationUnderneath() {
bool String::HasOnlyAsciiChars() {
uint32_t type = map()->instance_type();
return (type & kStringEncodingMask) == kOneByteStringTag ||
(type & kAsciiDataHintMask) == kAsciiDataHintTag;
return (type & kAsciiDataHintMask) == kAsciiDataHintTag;
}

27
src/objects.h
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@ -530,39 +530,46 @@ const uint32_t kShortcutTypeTag = kConsStringTag;
enum InstanceType {
// String types.
SYMBOL_TYPE = kTwoByteStringTag | kSymbolTag | kSeqStringTag,
ASCII_SYMBOL_TYPE = kOneByteStringTag | kSymbolTag | kSeqStringTag,
ASCII_SYMBOL_TYPE = kOneByteStringTag | kAsciiDataHintTag | kSymbolTag |
kSeqStringTag,
CONS_SYMBOL_TYPE = kTwoByteStringTag | kSymbolTag | kConsStringTag,
CONS_ASCII_SYMBOL_TYPE = kOneByteStringTag | kSymbolTag | kConsStringTag,
CONS_ASCII_SYMBOL_TYPE = kOneByteStringTag | kAsciiDataHintTag | kSymbolTag |
kConsStringTag,
SHORT_EXTERNAL_SYMBOL_TYPE = kTwoByteStringTag | kSymbolTag |
kExternalStringTag | kShortExternalStringTag,
SHORT_EXTERNAL_SYMBOL_WITH_ASCII_DATA_TYPE =
kTwoByteStringTag | kSymbolTag | kExternalStringTag |
kAsciiDataHintTag | kShortExternalStringTag,
SHORT_EXTERNAL_ASCII_SYMBOL_TYPE = kOneByteStringTag | kExternalStringTag |
kSymbolTag | kShortExternalStringTag,
SHORT_EXTERNAL_ASCII_SYMBOL_TYPE = kOneByteStringTag | kAsciiDataHintTag |
kExternalStringTag | kSymbolTag |
kShortExternalStringTag,
EXTERNAL_SYMBOL_TYPE = kTwoByteStringTag | kSymbolTag | kExternalStringTag,
EXTERNAL_SYMBOL_WITH_ASCII_DATA_TYPE =
kTwoByteStringTag | kSymbolTag | kExternalStringTag | kAsciiDataHintTag,
EXTERNAL_ASCII_SYMBOL_TYPE =
kOneByteStringTag | kSymbolTag | kExternalStringTag,
kOneByteStringTag | kAsciiDataHintTag | kSymbolTag | kExternalStringTag,
STRING_TYPE = kTwoByteStringTag | kSeqStringTag,
ASCII_STRING_TYPE = kOneByteStringTag | kSeqStringTag,
ASCII_STRING_TYPE = kOneByteStringTag | kAsciiDataHintTag | kSeqStringTag,
CONS_STRING_TYPE = kTwoByteStringTag | kConsStringTag,
CONS_ASCII_STRING_TYPE = kOneByteStringTag | kConsStringTag,
CONS_ASCII_STRING_TYPE =
kOneByteStringTag | kAsciiDataHintTag | kConsStringTag,
SLICED_STRING_TYPE = kTwoByteStringTag | kSlicedStringTag,
SLICED_ASCII_STRING_TYPE = kOneByteStringTag | kSlicedStringTag,
SLICED_ASCII_STRING_TYPE =
kOneByteStringTag | kAsciiDataHintTag | kSlicedStringTag,
SHORT_EXTERNAL_STRING_TYPE =
kTwoByteStringTag | kExternalStringTag | kShortExternalStringTag,
SHORT_EXTERNAL_STRING_WITH_ASCII_DATA_TYPE =
kTwoByteStringTag | kExternalStringTag |
kAsciiDataHintTag | kShortExternalStringTag,
SHORT_EXTERNAL_ASCII_STRING_TYPE =
kOneByteStringTag | kExternalStringTag | kShortExternalStringTag,
kOneByteStringTag | kAsciiDataHintTag |
kExternalStringTag | kShortExternalStringTag,
EXTERNAL_STRING_TYPE = kTwoByteStringTag | kExternalStringTag,
EXTERNAL_STRING_WITH_ASCII_DATA_TYPE =
kTwoByteStringTag | kExternalStringTag | kAsciiDataHintTag,
// LAST_STRING_TYPE
EXTERNAL_ASCII_STRING_TYPE = kOneByteStringTag | kExternalStringTag,
EXTERNAL_ASCII_STRING_TYPE =
kOneByteStringTag | kAsciiDataHintTag | kExternalStringTag,
PRIVATE_EXTERNAL_ASCII_STRING_TYPE = EXTERNAL_ASCII_STRING_TYPE,
// Objects allocated in their own spaces (never in new space).

5
src/x64/code-stubs-x64.cc
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@ -4765,11 +4765,6 @@ void StringAddStub::Generate(MacroAssembler* masm) {
// r9: second instance type.
__ testb(rcx, Immediate(kAsciiDataHintMask));
__ j(not_zero, &ascii_data);
__ xor_(r8, r9);
STATIC_ASSERT(kOneByteStringTag != 0 && kAsciiDataHintTag != 0);
__ andb(r8, Immediate(kOneByteStringTag | kAsciiDataHintTag));
__ cmpb(r8, Immediate(kOneByteStringTag | kAsciiDataHintTag));
__ j(equal, &ascii_data);
// Allocate a two byte cons string.
__ AllocateTwoByteConsString(rcx, rdi, no_reg, &call_runtime);
__ jmp(&allocated);