Implement _CONFIG macro to allow users to se to configuration settings on the part.
Implement _section macro to allow users to place objects in specific sections.
Implement _address macro to allow users to place objects at a particular address.
Placing objects at a memory address:
crate a unique section name from varname, address, object type and put that section at specified address. Mark this section a full (size = banksize) so that other objects do not compete for it while placing objects to sections in AsmPrinter.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@74822 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/PIC16/PIC16TargetAsmInfo.cpp b/lib/Target/PIC16/PIC16TargetAsmInfo.cpp
index d2657f0..a81c95f 100644
--- a/lib/Target/PIC16/PIC16TargetAsmInfo.cpp
+++ b/lib/Target/PIC16/PIC16TargetAsmInfo.cpp
@@ -44,7 +44,8 @@
// Need because otherwise a .text symbol is emitted by DwarfWriter
// in BeginModule, and gpasm cribbs for that .text symbol.
TextSection = getUnnamedSection("", SectionFlags::Code);
- ROSection = new PIC16Section(getReadOnlySection());
+ PIC16Section *ROSection = new PIC16Section(getReadOnlySection());
+ ROSections.push_back(ROSection);
ExternalVarDecls = new PIC16Section(getNamedSection("ExternalVarDecls"));
ExternalVarDefs = new PIC16Section(getNamedSection("ExternalVarDefs"));
// Set it to false because we weed to generate c file name and not bc file
@@ -235,10 +236,8 @@
return getIDATASectionForGlobal(GV);
// This is initialized data in rom, put it in the readonly section.
- if (GV->getType()->getAddressSpace() == PIC16ISD::ROM_SPACE) {
- ROSection->Items.push_back(GV);
- return ROSection->S_;
- }
+ if (GV->getType()->getAddressSpace() == PIC16ISD::ROM_SPACE)
+ return getROSectionForGlobal(GV);
// Else let the default implementation take care of it.
return TargetAsmInfo::SelectSectionForGlobal(GV);
@@ -258,7 +257,191 @@
delete AutosSections[i];
}
- delete ROSection;
+ for (unsigned i = 0; i < ROSections.size(); i++) {
+ delete ROSections[i];
+ }
+
delete ExternalVarDecls;
delete ExternalVarDefs;
}
+
+// Override the default implementation. Create PIC16sections for variables
+// which have a section name or address.
+const Section*
+PIC16TargetAsmInfo::SectionForGlobal(const GlobalValue *GV) const {
+ const Section* S;
+ // If GV has a sectin name or section address create that section now.
+ if (GV->hasSection()) {
+ std::string SectName = GV->getSection();
+ // If address for a variable is specified, get the address and create
+ // section.
+ std::string AddrStr = "Address=";
+ if (SectName.compare(0, AddrStr.length(), AddrStr) == 0) {
+ std::string SectAddr = SectName.substr(AddrStr.length());
+ S = CreateSectionForGlobal(GV, SectAddr);
+ }
+ else {
+ S = CreateSectionForGlobal(GV);
+ }
+ } else {
+ // Use section depending on the 'type' of variable
+ S = SelectSectionForGlobal(GV);
+ }
+ return S;
+}
+
+// Create a new section for global variable. If Addr is given then create
+// section at that address else create by name.
+const Section *
+PIC16TargetAsmInfo::CreateSectionForGlobal(const GlobalValue *GV1,
+ std::string Addr) const {
+ const GlobalVariable *GV = dyn_cast<GlobalVariable>(GV1);
+
+ if (!GV)
+ return TargetAsmInfo::SectionForGlobal(GV1);
+
+ // See if this is an uninitialized global.
+ const Constant *C = GV->getInitializer();
+ if (C->isNullValue())
+ return CreateBSSSectionForGlobal(GV, Addr);
+
+ // If this is initialized data in RAM. Put it in the correct IDATA section.
+ if (GV->getType()->getAddressSpace() == PIC16ISD::RAM_SPACE)
+ return CreateIDATASectionForGlobal(GV, Addr);
+
+ // This is initialized data in rom, put it in the readonly section.
+ if (GV->getType()->getAddressSpace() == PIC16ISD::ROM_SPACE)
+ return CreateROSectionForGlobal(GV, Addr);
+
+ // Else let the default implementation take care of it.
+ return TargetAsmInfo::SectionForGlobal(GV);
+}
+
+// Create uninitialized section for a variable.
+const Section *
+PIC16TargetAsmInfo::CreateBSSSectionForGlobal(const GlobalVariable *GV,
+ std::string Addr) const {
+ assert (GV->hasInitializer() && "This global doesn't need space");
+ Constant *C = GV->getInitializer();
+ assert (C->isNullValue() && "Unitialized globals has non-zero initializer");
+ std::string Name;
+ // If address is given then create a section at that address else create a
+ // section by section name specified in GV.
+ PIC16Section *FoundBSS = NULL;
+ if (Addr.empty()) {
+ Name = GV->getSection() + " UDATA";
+ for (unsigned i = 0; i < BSSSections.size(); i++) {
+ if (BSSSections[i]->S_->getName() == Name) {
+ FoundBSS = BSSSections[i];
+ break;
+ }
+ }
+ }
+ else {
+ std::string Prefix = GV->getName() + "." + Addr + ".";
+ Name = PAN::getUdataSectionName(BSSSections.size(), Prefix) + " " + Addr;
+ }
+
+ PIC16Section *NewBSS = FoundBSS;
+ if (NewBSS == NULL) {
+ const Section *NewSection = getNamedSection (Name.c_str());
+ NewBSS = new PIC16Section(NewSection);
+ BSSSections.push_back(NewBSS);
+ }
+
+ // Insert the GV into this BSS.
+ NewBSS->Items.push_back(GV);
+
+ // We do not want to put any GV without explicit section into this section
+ // so set its size to DatabankSize.
+ NewBSS->Size = DataBankSize;
+ return NewBSS->S_;
+}
+
+// Get rom section for a variable. Currently there can be only one rom section
+// unless a variable explicitly requests a section.
+const Section *
+PIC16TargetAsmInfo::getROSectionForGlobal(const GlobalVariable *GV) const {
+ ROSections[0]->Items.push_back(GV);
+ return ROSections[0]->S_;
+}
+
+// Create initialized data section for a variable.
+const Section *
+PIC16TargetAsmInfo::CreateIDATASectionForGlobal(const GlobalVariable *GV,
+ std::string Addr) const {
+ assert (GV->hasInitializer() && "This global doesn't need space");
+ Constant *C = GV->getInitializer();
+ assert (!C->isNullValue() && "initialized globals has zero initializer");
+ assert (GV->getType()->getAddressSpace() == PIC16ISD::RAM_SPACE &&
+ "can be used for initialized RAM data only");
+
+ std::string Name;
+ // If address is given then create a section at that address else create a
+ // section by section name specified in GV.
+ PIC16Section *FoundIDATASec = NULL;
+ if (Addr.empty()) {
+ Name = GV->getSection() + " IDATA";
+ for (unsigned i = 0; i < IDATASections.size(); i++) {
+ if (IDATASections[i]->S_->getName() == Name) {
+ FoundIDATASec = IDATASections[i];
+ break;
+ }
+ }
+ }
+ else {
+ std::string Prefix = GV->getName() + "." + Addr + ".";
+ Name = PAN::getIdataSectionName(IDATASections.size(), Prefix) + " " + Addr;
+ }
+
+ PIC16Section *NewIDATASec = FoundIDATASec;
+ if (NewIDATASec == NULL) {
+ const Section *NewSection = getNamedSection (Name.c_str());
+ NewIDATASec = new PIC16Section(NewSection);
+ IDATASections.push_back(NewIDATASec);
+ }
+ // Insert the GV into this IDATA Section.
+ NewIDATASec->Items.push_back(GV);
+ // We do not want to put any GV without explicit section into this section
+ // so set its size to DatabankSize.
+ NewIDATASec->Size = DataBankSize;
+ return NewIDATASec->S_;
+}
+
+// Create a section in rom for a variable.
+const Section *
+PIC16TargetAsmInfo::CreateROSectionForGlobal(const GlobalVariable *GV,
+ std::string Addr) const {
+ assert (GV->getType()->getAddressSpace() == PIC16ISD::ROM_SPACE &&
+ "can be used for ROM data only");
+
+ std::string Name;
+ // If address is given then create a section at that address else create a
+ // section by section name specified in GV.
+ PIC16Section *FoundROSec = NULL;
+ if (Addr.empty()) {
+ Name = GV->getSection() + " ROMDATA";
+ for (unsigned i = 1; i < ROSections.size(); i++) {
+ if (ROSections[i]->S_->getName() == Name) {
+ FoundROSec = ROSections[i];
+ break;
+ }
+ }
+ }
+ else {
+ std::string Prefix = GV->getName() + "." + Addr + ".";
+ Name = PAN::getRomdataSectionName(ROSections.size(), Prefix) + " " + Addr;
+ }
+
+ PIC16Section *NewRomSec = FoundROSec;
+ if (NewRomSec == NULL) {
+ const Section *NewSection = getNamedSection (Name.c_str());
+ NewRomSec = new PIC16Section(NewSection);
+ ROSections.push_back(NewRomSec);
+ }
+
+ // Insert the GV into this ROM Section.
+ NewRomSec->Items.push_back(GV);
+ return NewRomSec->S_;
+}
+