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Read and write section info from/to .bc files

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@24321 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2005-11-12 01:33:40 +00:00
parent ba0ffcc1bc
commit 404cddfcf9
3 changed files with 80 additions and 20 deletions
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52
lib/Bytecode/Reader/Reader.cpp
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@@ -1891,6 +1891,10 @@ void BytecodeReader::ParseModuleGlobalInfo() {
if (Handler) Handler->handleModuleGlobalsBegin();
// SectionID - If a global has an explicit section specified, this map
// remembers the ID until we can translate it into a string.
std::map<GlobalValue*, unsigned> SectionID;
// Read global variables...
unsigned VarType = read_vbr_uint();
while (VarType != Type::VoidTyID) { // List is terminated by Void
@@ -1903,6 +1907,7 @@ void BytecodeReader::ParseModuleGlobalInfo() {
bool isConstant = VarType & 1;
bool hasInitializer = (VarType & 2) != 0;
unsigned Alignment = 0;
unsigned GlobalSectionID = 0;
// An extension word is present when linkage = 3 (internal) and hasinit = 0.
if (LinkageID == 3 && !hasInitializer) {
@@ -1912,6 +1917,9 @@ void BytecodeReader::ParseModuleGlobalInfo() {
hasInitializer = ExtWord & 1;
LinkageID = (ExtWord >> 1) & 7;
Alignment = (1 << ((ExtWord >> 4) & 31)) >> 1;
if (ExtWord & (1 << 9)) // Has a section ID.
GlobalSectionID = read_vbr_uint();
}
GlobalValue::LinkageTypes Linkage;
@@ -1942,6 +1950,9 @@ void BytecodeReader::ParseModuleGlobalInfo() {
GV->setAlignment(Alignment);
insertValue(GV, SlotNo, ModuleValues);
if (GlobalSectionID != 0)
SectionID[GV] = GlobalSectionID;
unsigned initSlot = 0;
if (hasInitializer) {
initSlot = read_vbr_uint();
@@ -1975,9 +1986,8 @@ void BytecodeReader::ParseModuleGlobalInfo() {
const FunctionType* FTy =
cast<FunctionType>(cast<PointerType>(Ty)->getElementType());
// Insert the place holder.
Function* Func = new Function(FTy, GlobalValue::ExternalLinkage,
Function *Func = new Function(FTy, GlobalValue::ExternalLinkage,
"", TheModule);
insertValue(Func, (FnSignature & (~0U >> 1)) >> 5, ModuleValues);
@@ -1997,6 +2007,9 @@ void BytecodeReader::ParseModuleGlobalInfo() {
unsigned ExtWord = read_vbr_uint();
Alignment = (1 << (ExtWord & 31)) >> 1;
CC |= ((ExtWord >> 5) & 15) << 4;
if (ExtWord & (1 << 10)) // Has a section ID.
SectionID[Func] = read_vbr_uint();
}
Func->setCallingConv(CC-1);
@@ -2014,28 +2027,47 @@ void BytecodeReader::ParseModuleGlobalInfo() {
// remove elements efficiently from the back of the vector.
std::reverse(FunctionSignatureList.begin(), FunctionSignatureList.end());
// If this bytecode format has dependent library information in it ..
if (!hasNoDependentLibraries) {
// Read in the number of dependent library items that follow
/// SectionNames - This contains the list of section names encoded in the
/// moduleinfoblock. Functions and globals with an explicit section index
/// into this to get their section name.
std::vector<std::string> SectionNames;
if (hasInconsistentModuleGlobalInfo) {
align32();
} else if (!hasNoDependentLibraries) {
// If this bytecode format has dependent library information in it, read in
// the number of dependent library items that follow.
unsigned num_dep_libs = read_vbr_uint();
std::string dep_lib;
while( num_dep_libs-- ) {
while (num_dep_libs--) {
dep_lib = read_str();
TheModule->addLibrary(dep_lib);
if (Handler)
Handler->handleDependentLibrary(dep_lib);
}
// Read target triple and place into the module
// Read target triple and place into the module.
std::string triple = read_str();
TheModule->setTargetTriple(triple);
if (Handler)
Handler->handleTargetTriple(triple);
if (At != BlockEnd) {
// If the file has section info in it, read the section names now.
unsigned NumSections = read_vbr_uint();
while (NumSections--)
SectionNames.push_back(read_str());
}
}
if (hasInconsistentModuleGlobalInfo)
align32();
// If any globals are in specified sections, assign them now.
for (std::map<GlobalValue*, unsigned>::iterator I = SectionID.begin(), E =
SectionID.end(); I != E; ++I)
if (I->second) {
if (I->second > SectionID.size())
error("SectionID out of range for global!");
I->first->setSection(SectionNames[I->second-1]);
}
// This is for future proofing... in the future extra fields may be added that
// we don't understand, so we transparently ignore them.