#define DEBUG_TYPE "dwarfdebug"
-#include "DIE.h"
#include "DIEHash.h"
-#include "DwarfCompileUnit.h"
+#include "DIE.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"
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.
}
/// \brief Including \p Parent adds the context of Parent to the hash..
-void DIEHash::addParentContext(DIE *Parent) {
+void DIEHash::addParentContext(const DIE &Parent) {
DEBUG(dbgs() << "Adding parent context to hash...\n");
// [7.27.2] For each surrounding type or namespace beginning with the
// outermost such construct...
- SmallVector<DIE *, 1> Parents;
- while (Parent->getTag() != dwarf::DW_TAG_compile_unit) {
- Parents.push_back(Parent);
- Parent = Parent->getParent();
+ SmallVector<const DIE *, 1> Parents;
+ const DIE *Cur = &Parent;
+ 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.
- for (SmallVectorImpl<DIE *>::reverse_iterator I = Parents.rbegin(),
- E = Parents.rend();
+ for (SmallVectorImpl<const DIE *>::reverse_iterator I = Parents.rbegin(),
+ E = Parents.rend();
I != E; ++I) {
- DIE *Die = *I;
+ const DIE &Die = **I;
// ... Append the letter "C" to the sequence...
addULEB128('C');
// ... Followed by the DWARF tag of the construct...
- addULEB128(Die->getTag());
+ addULEB128(Die.getTag());
// ... Then the name, taken from the DW_AT_name attribute.
- StringRef Name = getDIEStringAttr(*Die, dwarf::DW_AT_name);
+ StringRef Name = getDIEStringAttr(Die, dwarf::DW_AT_name);
DEBUG(dbgs() << "... adding context: " << Name << "\n");
if (!Name.empty())
addString(Name);
}
// Collect all of the attributes for a particular DIE in single structure.
-void DIEHash::collectAttributes(DIE *Die, DIEAttrs &Attrs) {
- const SmallVectorImpl<DIEValue *> &Values = Die->getValues();
- const DIEAbbrev &Abbrevs = Die->getAbbrev();
+void DIEHash::collectAttributes(const DIE &Die, DIEAttrs &Attrs) {
+ const SmallVectorImpl<DIEValue *> &Values = Die.getValues();
+ const DIEAbbrev &Abbrevs = Die.getAbbrev();
#define COLLECT_ATTR(NAME) \
case dwarf::NAME: \
<< 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;
}
addULEB128(Attribute);
// the context of the tag,
- if (DIE *Parent = Entry.getParent())
- addParentContext(Parent);
+ if (const DIE *Parent = Entry.getParent())
+ addParentContext(*Parent);
// the letter 'E',
addULEB128('E');
}
void DIEHash::hashDIEEntry(dwarf::Attribute Attribute, dwarf::Tag Tag,
- DIE &Entry) {
+ const DIE &Entry) {
assert(Tag != dwarf::DW_TAG_friend && "No current LLVM clients emit friend "
"tags. Add support here when there's "
"a use case");
// there's a decl/def difference in the containing type of a
// ptr_to_member_type, but it's what DWARF says, for some reason.
Attribute == dwarf::DW_AT_type) {
- // [FIXME] ... has a DW_AT_name attribute,
- hashShallowTypeReference(Attribute, Entry,
- getDIEStringAttr(Entry, dwarf::DW_AT_name));
- return;
+ // ... has a DW_AT_name attribute,
+ StringRef Name = getDIEStringAttr(Entry, dwarf::DW_AT_name);
+ if (!Name.empty()) {
+ hashShallowTypeReference(Attribute, Entry, Name);
+ return;
+ }
}
unsigned &DieNumber = Numbering[&Entry];
// ... process the type T recursively by performing Steps 2 through 7, and
// use the result as the attribute value.
DieNumber = Numbering.size();
- computeHash(&Entry);
+ 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 an individual attribute \param Attr based on the type of attribute and
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:
+ 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 {
+ addULEB128(cast<DIELoc>(Value)->ComputeSize(AP));
+ hashBlockData(cast<DIELoc>(Value)->getValues());
+ }
break;
- default:
- llvm_unreachable("Add support for additional forms");
+ // FIXME: Handle loclistptr.
+ case DIEValue::isLocList:
+ // 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.");
}
}
}
// Add all of the attributes for \param Die to the hash.
-void DIEHash::addAttributes(DIE *Die) {
+void DIEHash::addAttributes(const DIE &Die) {
DIEAttrs Attrs = {};
collectAttributes(Die, Attrs);
- hashAttributes(Attrs, Die->getTag());
+ hashAttributes(Attrs, Die.getTag());
+}
+
+void DIEHash::hashNestedType(const DIE &Die, StringRef Name) {
+ // 7.27 Step 7
+ // ... append the letter 'S',
+ addULEB128('S');
+
+ // the tag of C,
+ addULEB128(Die.getTag());
+
+ // and the name.
+ addString(Name);
}
// Compute the hash of a DIE. This is based on the type signature computation
// given in section 7.27 of the DWARF4 standard. It is the md5 hash of a
// flattened description of the DIE.
-void DIEHash::computeHash(DIE *Die) {
+void DIEHash::computeHash(const DIE &Die) {
// Append the letter 'D', followed by the DWARF tag of the DIE.
addULEB128('D');
- addULEB128(Die->getTag());
+ addULEB128(Die.getTag());
// Add each of the attributes of the 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)
- computeHash(*I);
+ for (std::vector<DIE *>::const_iterator I = Die.getChildren().begin(),
+ E = Die.getChildren().end();
+ I != E; ++I) {
+ // 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);
+ // ... and has a DW_AT_name attribute
+ if (!Name.empty()) {
+ hashNestedType(**I, Name);
+ continue;
+ }
+ }
+ computeHash(**I);
+ }
// Following the last (or if there are no children), append a zero byte.
Hash.update(makeArrayRef((uint8_t)'\0'));
/// DWARF4 standard. It is the md5 hash of a flattened description of the DIE
/// with the exception that we are hashing only the context and the name of the
/// type.
-uint64_t DIEHash::computeDIEODRSignature(DIE *Die) {
+uint64_t DIEHash::computeDIEODRSignature(const DIE &Die) {
// Add the contexts to the hash. We won't be computing the ODR hash for
// function local types so it's safe to use the generic context hashing
// algorithm here.
// FIXME: If we figure out how to account for linkage in some way we could
// actually do this with a slight modification to the parent hash algorithm.
- DIE *Parent = Die->getParent();
- if (Parent)
- addParentContext(Parent);
+ if (const DIE *Parent = Die.getParent())
+ addParentContext(*Parent);
// Add the current DIE information.
// Add the DWARF tag of the DIE.
- addULEB128(Die->getTag());
+ addULEB128(Die.getTag());
// Add the name of the type to the hash.
- addString(getDIEStringAttr(*Die, dwarf::DW_AT_name));
+ addString(getDIEStringAttr(Die, dwarf::DW_AT_name));
// Now get the result.
MD5::MD5Result Result;
/// DWARF4 standard. It is an md5 hash of the flattened description of the DIE
/// with the inclusion of the full CU and all top level CU entities.
// TODO: Initialize the type chain at 0 instead of 1 for CU signatures.
-uint64_t DIEHash::computeCUSignature(DIE *Die) {
+uint64_t DIEHash::computeCUSignature(const DIE &Die) {
Numbering.clear();
- Numbering[Die] = 1;
+ Numbering[&Die] = 1;
// Hash the DIE.
computeHash(Die);
/// DWARF4 standard. It is an md5 hash of the flattened description of the DIE
/// with the inclusion of additional forms not specifically called out in the
/// standard.
-uint64_t DIEHash::computeTypeSignature(DIE *Die) {
+uint64_t DIEHash::computeTypeSignature(const DIE &Die) {
Numbering.clear();
- Numbering[Die] = 1;
+ Numbering[&Die] = 1;
- if (DIE *Parent = Die->getParent())
- addParentContext(Parent);
+ if (const DIE *Parent = Die.getParent())
+ addParentContext(*Parent);
// Hash the DIE.
computeHash(Die);
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