diff options
Diffstat (limited to 'contrib/llvm/lib/CodeGen/AsmPrinter/DIEHash.cpp')
| -rw-r--r-- | contrib/llvm/lib/CodeGen/AsmPrinter/DIEHash.cpp | 240 |
1 files changed, 146 insertions, 94 deletions
diff --git a/contrib/llvm/lib/CodeGen/AsmPrinter/DIEHash.cpp b/contrib/llvm/lib/CodeGen/AsmPrinter/DIEHash.cpp index 95eca90ef046..c2fad59aa4e1 100644 --- a/contrib/llvm/lib/CodeGen/AsmPrinter/DIEHash.cpp +++ b/contrib/llvm/lib/CodeGen/AsmPrinter/DIEHash.cpp @@ -11,14 +11,13 @@ // //===----------------------------------------------------------------------===// -#define DEBUG_TYPE "dwarfdebug" - +#include "ByteStreamer.h" #include "DIEHash.h" - #include "DIE.h" -#include "DwarfCompileUnit.h" +#include "DwarfDebug.h" #include "llvm/ADT/ArrayRef.h" #include "llvm/ADT/StringRef.h" +#include "llvm/CodeGen/AsmPrinter.h" #include "llvm/Support/Debug.h" #include "llvm/Support/Dwarf.h" #include "llvm/Support/Endian.h" @@ -27,6 +26,8 @@ using namespace llvm; +#define DEBUG_TYPE "dwarfdebug" + /// \brief Grabs the string in whichever attribute is passed in and returns /// a reference to it. static StringRef getDIEStringAttr(const DIE &Die, uint16_t Attr) { @@ -75,7 +76,7 @@ void DIEHash::addSLEB128(int64_t Value) { do { uint8_t Byte = Value & 0x7f; Value >>= 7; - More = !((((Value == 0 ) && ((Byte & 0x40) == 0)) || + More = !((((Value == 0) && ((Byte & 0x40) == 0)) || ((Value == -1) && ((Byte & 0x40) != 0)))); if (More) Byte |= 0x80; // Mark this byte to show that more bytes will follow. @@ -92,10 +93,12 @@ void DIEHash::addParentContext(const DIE &Parent) { // outermost such construct... SmallVector<const DIE *, 1> Parents; const DIE *Cur = &Parent; - while (Cur->getTag() != dwarf::DW_TAG_compile_unit) { + while (Cur->getParent()) { Parents.push_back(Cur); Cur = Cur->getParent(); } + assert(Cur->getTag() == dwarf::DW_TAG_compile_unit || + Cur->getTag() == dwarf::DW_TAG_type_unit); // Reverse iterate over our list to go from the outermost construct to the // innermost. @@ -134,55 +137,55 @@ void DIEHash::collectAttributes(const DIE &Die, DIEAttrs &Attrs) { << dwarf::AttributeString(Abbrevs.getData()[i].getAttribute()) << " added.\n"); switch (Abbrevs.getData()[i].getAttribute()) { - COLLECT_ATTR(DW_AT_name); - COLLECT_ATTR(DW_AT_accessibility); - COLLECT_ATTR(DW_AT_address_class); - COLLECT_ATTR(DW_AT_allocated); - COLLECT_ATTR(DW_AT_artificial); - COLLECT_ATTR(DW_AT_associated); - COLLECT_ATTR(DW_AT_binary_scale); - COLLECT_ATTR(DW_AT_bit_offset); - COLLECT_ATTR(DW_AT_bit_size); - COLLECT_ATTR(DW_AT_bit_stride); - COLLECT_ATTR(DW_AT_byte_size); - COLLECT_ATTR(DW_AT_byte_stride); - COLLECT_ATTR(DW_AT_const_expr); - COLLECT_ATTR(DW_AT_const_value); - COLLECT_ATTR(DW_AT_containing_type); - COLLECT_ATTR(DW_AT_count); - COLLECT_ATTR(DW_AT_data_bit_offset); - COLLECT_ATTR(DW_AT_data_location); - COLLECT_ATTR(DW_AT_data_member_location); - COLLECT_ATTR(DW_AT_decimal_scale); - COLLECT_ATTR(DW_AT_decimal_sign); - COLLECT_ATTR(DW_AT_default_value); - COLLECT_ATTR(DW_AT_digit_count); - COLLECT_ATTR(DW_AT_discr); - COLLECT_ATTR(DW_AT_discr_list); - COLLECT_ATTR(DW_AT_discr_value); - COLLECT_ATTR(DW_AT_encoding); - COLLECT_ATTR(DW_AT_enum_class); - COLLECT_ATTR(DW_AT_endianity); - COLLECT_ATTR(DW_AT_explicit); - COLLECT_ATTR(DW_AT_is_optional); - COLLECT_ATTR(DW_AT_location); - COLLECT_ATTR(DW_AT_lower_bound); - COLLECT_ATTR(DW_AT_mutable); - COLLECT_ATTR(DW_AT_ordering); - COLLECT_ATTR(DW_AT_picture_string); - COLLECT_ATTR(DW_AT_prototyped); - COLLECT_ATTR(DW_AT_small); - COLLECT_ATTR(DW_AT_segment); - COLLECT_ATTR(DW_AT_string_length); - COLLECT_ATTR(DW_AT_threads_scaled); - COLLECT_ATTR(DW_AT_upper_bound); - COLLECT_ATTR(DW_AT_use_location); - COLLECT_ATTR(DW_AT_use_UTF8); - COLLECT_ATTR(DW_AT_variable_parameter); - COLLECT_ATTR(DW_AT_virtuality); - COLLECT_ATTR(DW_AT_visibility); - COLLECT_ATTR(DW_AT_vtable_elem_location); - COLLECT_ATTR(DW_AT_type); + COLLECT_ATTR(DW_AT_name); + COLLECT_ATTR(DW_AT_accessibility); + COLLECT_ATTR(DW_AT_address_class); + COLLECT_ATTR(DW_AT_allocated); + COLLECT_ATTR(DW_AT_artificial); + COLLECT_ATTR(DW_AT_associated); + COLLECT_ATTR(DW_AT_binary_scale); + COLLECT_ATTR(DW_AT_bit_offset); + COLLECT_ATTR(DW_AT_bit_size); + COLLECT_ATTR(DW_AT_bit_stride); + COLLECT_ATTR(DW_AT_byte_size); + COLLECT_ATTR(DW_AT_byte_stride); + COLLECT_ATTR(DW_AT_const_expr); + COLLECT_ATTR(DW_AT_const_value); + COLLECT_ATTR(DW_AT_containing_type); + COLLECT_ATTR(DW_AT_count); + COLLECT_ATTR(DW_AT_data_bit_offset); + COLLECT_ATTR(DW_AT_data_location); + COLLECT_ATTR(DW_AT_data_member_location); + COLLECT_ATTR(DW_AT_decimal_scale); + COLLECT_ATTR(DW_AT_decimal_sign); + COLLECT_ATTR(DW_AT_default_value); + COLLECT_ATTR(DW_AT_digit_count); + COLLECT_ATTR(DW_AT_discr); + COLLECT_ATTR(DW_AT_discr_list); + COLLECT_ATTR(DW_AT_discr_value); + COLLECT_ATTR(DW_AT_encoding); + COLLECT_ATTR(DW_AT_enum_class); + COLLECT_ATTR(DW_AT_endianity); + COLLECT_ATTR(DW_AT_explicit); + COLLECT_ATTR(DW_AT_is_optional); + COLLECT_ATTR(DW_AT_location); + COLLECT_ATTR(DW_AT_lower_bound); + COLLECT_ATTR(DW_AT_mutable); + COLLECT_ATTR(DW_AT_ordering); + COLLECT_ATTR(DW_AT_picture_string); + COLLECT_ATTR(DW_AT_prototyped); + COLLECT_ATTR(DW_AT_small); + COLLECT_ATTR(DW_AT_segment); + COLLECT_ATTR(DW_AT_string_length); + COLLECT_ATTR(DW_AT_threads_scaled); + COLLECT_ATTR(DW_AT_upper_bound); + COLLECT_ATTR(DW_AT_use_location); + COLLECT_ATTR(DW_AT_use_UTF8); + COLLECT_ATTR(DW_AT_variable_parameter); + COLLECT_ATTR(DW_AT_virtuality); + COLLECT_ATTR(DW_AT_visibility); + COLLECT_ATTR(DW_AT_vtable_elem_location); + COLLECT_ATTR(DW_AT_type); default: break; } @@ -269,6 +272,24 @@ void DIEHash::hashDIEEntry(dwarf::Attribute Attribute, dwarf::Tag Tag, computeHash(Entry); } +// Hash all of the values in a block like set of values. This assumes that +// all of the data is going to be added as integers. +void DIEHash::hashBlockData(const SmallVectorImpl<DIEValue *> &Values) { + for (SmallVectorImpl<DIEValue *>::const_iterator I = Values.begin(), + E = Values.end(); + I != E; ++I) + Hash.update((uint64_t)cast<DIEInteger>(*I)->getValue()); +} + +// Hash the contents of a loclistptr class. +void DIEHash::hashLocList(const DIELocList &LocList) { + HashingByteStreamer Streamer(*this); + DwarfDebug &DD = *AP->getDwarfDebug(); + for (const auto &Entry : + DD.getDebugLocEntries()[LocList.getValue()].List) + DD.emitDebugLocEntry(Streamer, Entry); +} + // Hash an individual attribute \param Attr based on the type of attribute and // the form. void DIEHash::hashAttribute(AttrEntry Attr, dwarf::Tag Tag) { @@ -276,43 +297,76 @@ void DIEHash::hashAttribute(AttrEntry Attr, dwarf::Tag Tag) { const DIEAbbrevData *Desc = Attr.Desc; dwarf::Attribute Attribute = Desc->getAttribute(); - // 7.27 Step 3 - // ... An attribute that refers to another type entry T is processed as - // follows: - if (const DIEEntry *EntryAttr = dyn_cast<DIEEntry>(Value)) { - hashDIEEntry(Attribute, Tag, *EntryAttr->getEntry()); - return; + // Other attribute values use the letter 'A' as the marker, and the value + // consists of the form code (encoded as an unsigned LEB128 value) followed by + // the encoding of the value according to the form code. To ensure + // reproducibility of the signature, the set of forms used in the signature + // computation is limited to the following: DW_FORM_sdata, DW_FORM_flag, + // DW_FORM_string, and DW_FORM_block. + + switch (Value->getType()) { + // 7.27 Step 3 + // ... An attribute that refers to another type entry T is processed as + // follows: + case DIEValue::isEntry: + hashDIEEntry(Attribute, Tag, cast<DIEEntry>(Value)->getEntry()); + break; + case DIEValue::isInteger: { + addULEB128('A'); + addULEB128(Attribute); + switch (Desc->getForm()) { + case dwarf::DW_FORM_data1: + case dwarf::DW_FORM_data2: + case dwarf::DW_FORM_data4: + case dwarf::DW_FORM_data8: + case dwarf::DW_FORM_udata: + case dwarf::DW_FORM_sdata: + addULEB128(dwarf::DW_FORM_sdata); + addSLEB128((int64_t)cast<DIEInteger>(Value)->getValue()); + break; + // DW_FORM_flag_present is just flag with a value of one. We still give it a + // value so just use the value. + case dwarf::DW_FORM_flag_present: + case dwarf::DW_FORM_flag: + addULEB128(dwarf::DW_FORM_flag); + addULEB128((int64_t)cast<DIEInteger>(Value)->getValue()); + break; + default: + llvm_unreachable("Unknown integer form!"); + } + break; } - - // Other attribute values use the letter 'A' as the marker, ... - addULEB128('A'); - - addULEB128(Attribute); - - // ... and the value consists of the form code (encoded as an unsigned LEB128 - // value) followed by the encoding of the value according to the form code. To - // ensure reproducibility of the signature, the set of forms used in the - // signature computation is limited to the following: DW_FORM_sdata, - // DW_FORM_flag, DW_FORM_string, and DW_FORM_block. - switch (Desc->getForm()) { - case dwarf::DW_FORM_string: - llvm_unreachable( - "Add support for DW_FORM_string if we ever start emitting them again"); - case dwarf::DW_FORM_GNU_str_index: - case dwarf::DW_FORM_strp: + case DIEValue::isString: + addULEB128('A'); + addULEB128(Attribute); addULEB128(dwarf::DW_FORM_string); addString(cast<DIEString>(Value)->getString()); break; - case dwarf::DW_FORM_data1: - case dwarf::DW_FORM_data2: - case dwarf::DW_FORM_data4: - case dwarf::DW_FORM_data8: - case dwarf::DW_FORM_udata: - addULEB128(dwarf::DW_FORM_sdata); - addSLEB128((int64_t)cast<DIEInteger>(Value)->getValue()); + case DIEValue::isBlock: + case DIEValue::isLoc: + case DIEValue::isLocList: + addULEB128('A'); + addULEB128(Attribute); + addULEB128(dwarf::DW_FORM_block); + if (isa<DIEBlock>(Value)) { + addULEB128(cast<DIEBlock>(Value)->ComputeSize(AP)); + hashBlockData(cast<DIEBlock>(Value)->getValues()); + } else if (isa<DIELoc>(Value)) { + addULEB128(cast<DIELoc>(Value)->ComputeSize(AP)); + hashBlockData(cast<DIELoc>(Value)->getValues()); + } else { + // We could add the block length, but that would take + // a bit of work and not add a lot of uniqueness + // to the hash in some way we could test. + hashLocList(*cast<DIELocList>(Value)); + } break; - default: - llvm_unreachable("Add support for additional forms"); + // FIXME: It's uncertain whether or not we should handle this at the moment. + case DIEValue::isExpr: + case DIEValue::isLabel: + case DIEValue::isDelta: + case DIEValue::isTypeSignature: + llvm_unreachable("Add support for additional value types."); } } @@ -409,20 +463,18 @@ void DIEHash::computeHash(const DIE &Die) { addAttributes(Die); // Then hash each of the children of the DIE. - for (std::vector<DIE *>::const_iterator I = Die.getChildren().begin(), - E = Die.getChildren().end(); - I != E; ++I) { + for (auto &C : Die.getChildren()) { // 7.27 Step 7 // If C is a nested type entry or a member function entry, ... - if (isType((*I)->getTag()) || (*I)->getTag() == dwarf::DW_TAG_subprogram) { - StringRef Name = getDIEStringAttr(**I, dwarf::DW_AT_name); + if (isType(C->getTag()) || C->getTag() == dwarf::DW_TAG_subprogram) { + StringRef Name = getDIEStringAttr(*C, dwarf::DW_AT_name); // ... and has a DW_AT_name attribute if (!Name.empty()) { - hashNestedType(**I, Name); + hashNestedType(*C, Name); continue; } } - computeHash(**I); + computeHash(*C); } // Following the last (or if there are no children), append a zero byte. |