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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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44
lib/Bytecode/Writer/Writer.cpp
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@ -922,6 +922,11 @@ static unsigned getEncodedLinkage(const GlobalValue *GV) {
void BytecodeWriter::outputModuleInfoBlock(const Module *M) {
BytecodeBlock ModuleInfoBlock(BytecodeFormat::ModuleGlobalInfoBlockID, *this);
// Give numbers to sections as we encounter them.
unsigned SectionIDCounter = 0;
std::vector<std::string> SectionNames;
std::map<std::string, unsigned> SectionID;
// Output the types for the global variables in the module...
for (Module::const_global_iterator I = M->global_begin(),
End = M->global_end(); I != End; ++I) {
@ -933,7 +938,7 @@ void BytecodeWriter::outputModuleInfoBlock(const Module *M) {
// Fields: bit0 = isConstant, bit1 = hasInitializer, bit2-4=Linkage,
// bit5+ = Slot # for type.
bool HasExtensionWord = I->getAlignment() != 0;
bool HasExtensionWord = (I->getAlignment() != 0) || I->hasSection();
// If we need to use the extension byte, set linkage=3(internal) and
// initializer = 0 (impossible!).
@ -947,11 +952,22 @@ void BytecodeWriter::outputModuleInfoBlock(const Module *M) {
output_vbr(oSlot);
// The extension word has this format: bit 0 = has initializer, bit 1-3 =
// linkage, bit 4-8 = alignment (log2), bits 10+ = future use.
// linkage, bit 4-8 = alignment (log2), bit 9 = has SectionID,
// bits 10+ = future use.
unsigned ExtWord = (unsigned)I->hasInitializer() |
(getEncodedLinkage(I) << 1) |
((Log2_32(I->getAlignment())+1) << 4);
((Log2_32(I->getAlignment())+1) << 4) |
((unsigned)I->hasSection() << 9);
output_vbr(ExtWord);
if (I->hasSection()) {
// Give section names unique ID's.
unsigned &Entry = SectionID[I->getSection()];
if (Entry == 0) {
Entry = ++SectionIDCounter;
SectionNames.push_back(I->getSection());
}
output_vbr(Entry);
}
}
// If we have an initializer, output it now.
@ -975,16 +991,27 @@ void BytecodeWriter::outputModuleInfoBlock(const Module *M) {
if (I->isExternal()) // If external, we don't have an FunctionInfo block.
ID |= 1 << 4;
if (I->getAlignment() || (CC & ~15) != 0)
if (I->getAlignment() || I->hasSection() || (CC & ~15) != 0)
ID |= 1 << 31; // Do we need an extension word?
output_vbr(ID);
if (ID & (1 << 31)) {
// Extension byte: bits 0-4 = alignment, bits 5-9 = top nibble of calling
// convention.
ID = (Log2_32(I->getAlignment())+1) | ((CC >> 4) << 5);
// convention, bit 10 = hasSectionID.
ID = (Log2_32(I->getAlignment())+1) | ((CC >> 4) << 5) |
(I->hasSection() << 10);
output_vbr(ID);
// Give section names unique ID's.
if (I->hasSection()) {
unsigned &Entry = SectionID[I->getSection()];
if (Entry == 0) {
Entry = ++SectionIDCounter;
SectionNames.push_back(I->getSection());
}
output_vbr(Entry);
}
}
}
output_vbr((unsigned)Table.getSlot(Type::VoidTy) << 5);
@ -998,6 +1025,11 @@ void BytecodeWriter::outputModuleInfoBlock(const Module *M) {
// Output the target triple from the module
output(M->getTargetTriple());
// Emit the table of section names.
output_vbr((unsigned)SectionNames.size());
for (unsigned i = 0, e = SectionNames.size(); i != e; ++i)
output(SectionNames[i]);
}
void BytecodeWriter::outputInstructions(const Function *F) {