* PIC codegen for X86/Linux has been implemented

* PIC-aware internal structures in X86 Codegen have been refactored
* Visibility (default/weak) has been added
* Docs fixes (external weak linkage, visibility, formatting)


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@33136 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Anton Korobeynikov
2007-01-12 19:20:47 +00:00
parent ab7752c149
commit 7f70559bc4
31 changed files with 607 additions and 178 deletions

View File

@@ -960,6 +960,14 @@ static unsigned getEncodedLinkage(const GlobalValue *GV) {
}
}
static unsigned getEncodedVisibility(const GlobalValue *GV) {
switch (GV->getVisibility()) {
default: assert(0 && "Invalid visibility!");
case GlobalValue::DefaultVisibility: return 0;
case GlobalValue::HiddenVisibility: return 1;
}
}
void BytecodeWriter::outputModuleInfoBlock(const Module *M) {
BytecodeBlock ModuleInfoBlock(BytecodeFormat::ModuleGlobalInfoBlockID, *this);
@@ -979,7 +987,9 @@ void BytecodeWriter::outputModuleInfoBlock(const Module *M) {
// Fields: bit0 = isConstant, bit1 = hasInitializer, bit2-4=Linkage,
// bit5+ = Slot # for type.
bool HasExtensionWord = (I->getAlignment() != 0) || I->hasSection();
bool HasExtensionWord = (I->getAlignment() != 0) ||
I->hasSection() ||
(I->getVisibility() != GlobalValue::DefaultVisibility);
// If we need to use the extension byte, set linkage=3(internal) and
// initializer = 0 (impossible!).
@@ -993,12 +1003,13 @@ 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), bit 9 = has SectionID,
// bits 10+ = future use.
// linkage, bit 4-8 = alignment (log2), bit 9 = has SectionID,
// bits 10-12 = visibility, bits 13+ = future use.
unsigned ExtWord = (unsigned)I->hasInitializer() |
(getEncodedLinkage(I) << 1) |
((Log2_32(I->getAlignment())+1) << 4) |
((unsigned)I->hasSection() << 9);
((unsigned)I->hasSection() << 9) |
(getEncodedVisibility(I) << 10);
output_vbr(ExtWord);
if (I->hasSection()) {
// Give section names unique ID's.
@@ -1102,7 +1113,8 @@ void BytecodeWriter::outputFunction(const Function *F) {
if (F->isExternal()) return;
BytecodeBlock FunctionBlock(BytecodeFormat::FunctionBlockID, *this);
output_vbr(getEncodedLinkage(F));
unsigned rWord = (getEncodedVisibility(F) << 16) | getEncodedLinkage(F);
output_vbr(rWord);
// Get slot information about the function...
Table.incorporateFunction(F);