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* PIC codegen for X86/Linux has been implemented

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* 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
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36
lib/Bytecode/Reader/Reader.cpp
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@ -1628,9 +1628,12 @@ void BytecodeReader::ParseFunctionBody(Function* F) {
unsigned FuncSize = BlockEnd - At;
GlobalValue::LinkageTypes Linkage = GlobalValue::ExternalLinkage;
GlobalValue::VisibilityTypes Visibility = GlobalValue::DefaultVisibility;
unsigned LinkageType = read_vbr_uint();
switch (LinkageType) {
unsigned rWord = read_vbr_uint();
unsigned LinkageID = rWord & 65535;
unsigned VisibilityID = rWord >> 16;
switch (LinkageID) {
case 0: Linkage = GlobalValue::ExternalLinkage; break;
case 1: Linkage = GlobalValue::WeakLinkage; break;
case 2: Linkage = GlobalValue::AppendingLinkage; break;
@ -1644,8 +1647,17 @@ void BytecodeReader::ParseFunctionBody(Function* F) {
Linkage = GlobalValue::InternalLinkage;
break;
}
switch (VisibilityID) {
case 0: Visibility = GlobalValue::DefaultVisibility; break;
case 1: Visibility = GlobalValue::HiddenVisibility; break;
default:
error("Unknown visibility type: " + utostr(VisibilityID));
Visibility = GlobalValue::DefaultVisibility;
break;
}
F->setLinkage(Linkage);
F->setVisibility(Visibility);
if (Handler) Handler->handleFunctionBegin(F,FuncSize);
// Keep track of how many basic blocks we have read in...
@ -1844,6 +1856,7 @@ void BytecodeReader::ParseModuleGlobalInfo() {
// Linkage, bit4+ = slot#
unsigned SlotNo = VarType >> 5;
unsigned LinkageID = (VarType >> 2) & 7;
unsigned VisibilityID = 0;
bool isConstant = VarType & 1;
bool hasInitializer = (VarType & 2) != 0;
unsigned Alignment = 0;
@ -1853,10 +1866,12 @@ void BytecodeReader::ParseModuleGlobalInfo() {
if (LinkageID == 3 && !hasInitializer) {
unsigned ExtWord = read_vbr_uint();
// 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 section,
// bits 10-12 = visibility, bits 13+ = future use.
hasInitializer = ExtWord & 1;
LinkageID = (ExtWord >> 1) & 7;
Alignment = (1 << ((ExtWord >> 4) & 31)) >> 1;
VisibilityID = (ExtWord >> 10) & 7;
if (ExtWord & (1 << 9)) // Has a section ID.
GlobalSectionID = read_vbr_uint();
@ -1877,7 +1892,16 @@ void BytecodeReader::ParseModuleGlobalInfo() {
Linkage = GlobalValue::InternalLinkage;
break;
}
GlobalValue::VisibilityTypes Visibility;
switch (VisibilityID) {
case 0: Visibility = GlobalValue::DefaultVisibility; break;
case 1: Visibility = GlobalValue::HiddenVisibility; break;
default:
error("Unknown visibility type: " + utostr(VisibilityID));
Visibility = GlobalValue::DefaultVisibility;
break;
}
const Type *Ty = getType(SlotNo);
if (!Ty)
error("Global has no type! SlotNo=" + utostr(SlotNo));
@ -1891,6 +1915,7 @@ void BytecodeReader::ParseModuleGlobalInfo() {
GlobalVariable *GV = new GlobalVariable(ElTy, isConstant, Linkage,
0, "", TheModule);
GV->setAlignment(Alignment);
GV->setVisibility(Visibility);
insertValue(GV, SlotNo, ModuleValues);
if (GlobalSectionID != 0)
@ -1904,7 +1929,8 @@ void BytecodeReader::ParseModuleGlobalInfo() {
// Notify handler about the global value.
if (Handler)
Handler->handleGlobalVariable(ElTy, isConstant, Linkage, SlotNo,initSlot);
Handler->handleGlobalVariable(ElTy, isConstant, Linkage, Visibility,
SlotNo, initSlot);
// Get next item
VarType = read_vbr_uint();