Emit banksel and movlp instructions.
Split large global data (both initialized and un-initialized) into multiple sections of <= 80 bytes.
Provide routines to manage PIC16 ABI naming conventions.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@71073 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/PIC16/PIC16TargetAsmInfo.cpp b/lib/Target/PIC16/PIC16TargetAsmInfo.cpp
index 6b0a0d0..ac4039b 100644
--- a/lib/Target/PIC16/PIC16TargetAsmInfo.cpp
+++ b/lib/Target/PIC16/PIC16TargetAsmInfo.cpp
@@ -14,6 +14,8 @@
#include "PIC16TargetAsmInfo.h"
#include "PIC16TargetMachine.h"
#include "llvm/GlobalValue.h"
+#include "llvm/GlobalVariable.h"
+#include "llvm/DerivedTypes.h"
using namespace llvm;
@@ -61,3 +63,204 @@
return NULL;
}
+const Section *
+PIC16TargetAsmInfo::getBSSSectionForGlobal(const GlobalVariable *GV) const {
+ assert (GV->hasInitializer() && "This global doesn't need space");
+ Constant *C = GV->getInitializer();
+ assert (C->isNullValue() && "Unitialized globals has non-zero initializer");
+
+ // Find how much space this global needs.
+ const TargetData *TD = TM.getTargetData();
+ const Type *Ty = C->getType();
+ unsigned ValSize = TD->getTypePaddedSize(Ty);
+
+ // Go through all BSS Sections and assign this variable
+ // to the first available section having enough space.
+ PIC16Section *FoundBSS = NULL;
+ for (unsigned i = 0; i < BSSSections.size(); i++) {
+ if (DataBankSize - BSSSections[i]->Size >= ValSize) {
+ FoundBSS = BSSSections[i];
+ break;
+ }
+ }
+
+ // No BSS section spacious enough was found. Crate a new one.
+ if (! FoundBSS) {
+ char *name = new char[32];
+ sprintf (name, "udata.%d.# UDATA", BSSSections.size());
+ const Section *NewSection = getNamedSection (name);
+
+ FoundBSS = new PIC16Section(NewSection);
+
+ // Add this newly created BSS section to the list of BSSSections.
+ BSSSections.push_back(FoundBSS);
+ }
+
+ // Insert the GV into this BSS.
+ FoundBSS->Items.push_back(GV);
+ FoundBSS->Size += ValSize;
+
+ // We can't do this here because GV is const .
+ // const std::string SName = FoundBSS->S_->getName();
+ // GV->setSection(SName);
+
+ return FoundBSS->S_;
+}
+
+const Section *
+PIC16TargetAsmInfo::getIDATASectionForGlobal(const GlobalVariable *GV) 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 split initialized RAM data only");
+
+ // Find how much space this global needs.
+ const TargetData *TD = TM.getTargetData();
+ const Type *Ty = C->getType();
+ unsigned ValSize = TD->getTypePaddedSize(Ty);
+
+ // Go through all IDATA Sections and assign this variable
+ // to the first available section having enough space.
+ PIC16Section *FoundIDATA = NULL;
+ for (unsigned i = 0; i < IDATASections.size(); i++) {
+ if ( DataBankSize - IDATASections[i]->Size >= ValSize) {
+ FoundIDATA = IDATASections[i];
+ break;
+ }
+ }
+
+ // No IDATA section spacious enough was found. Crate a new one.
+ if (! FoundIDATA) {
+ char *name = new char[32];
+ sprintf (name, "idata.%d.# IDATA", IDATASections.size());
+ const Section *NewSection = getNamedSection (name);
+
+ FoundIDATA = new PIC16Section(NewSection);
+
+ // Add this newly created IDATA section to the list of IDATASections.
+ IDATASections.push_back(FoundIDATA);
+ }
+
+ // Insert the GV into this IDATA.
+ FoundIDATA->Items.push_back(GV);
+ FoundIDATA->Size += ValSize;
+
+ // We can't do this here because GV is const .
+ // GV->setSection(FoundIDATA->S->getName());
+
+ return FoundIDATA->S_;
+}
+
+// Override default implementation to put the true globals into
+// multiple data sections if required.
+const Section*
+PIC16TargetAsmInfo::SelectSectionForGlobal(const GlobalValue *GV1) const {
+ // We select the section based on the initializer here, so it really
+ // has to be a GlobalVariable.
+ if (!isa<GlobalVariable>(GV1))
+ return TargetAsmInfo::SelectSectionForGlobal(GV1);
+
+ const GlobalVariable *GV = dyn_cast<GlobalVariable>(GV1);
+ // We are only dealing with true globals here. So names with a "."
+ // are local globals. Also declarations are not entertained.
+ std::string name = GV->getName();
+ if (name.find(".auto.") != std::string::npos
+ || name.find(".arg.") != std::string::npos || !GV->hasInitializer())
+ return TargetAsmInfo::SelectSectionForGlobal(GV);
+
+ const Constant *C = GV->getInitializer();
+ // See if this is an uninitialized global.
+ if (C->isNullValue())
+ return getBSSSectionForGlobal(GV);
+
+ // This is initialized data. We only deal with initialized data in RAM.
+ if (GV->getType()->getAddressSpace() == PIC16ISD::RAM_SPACE)
+ return getIDATASectionForGlobal(GV);
+
+ // Else let the default implementation take care of it.
+ return TargetAsmInfo::SelectSectionForGlobal(GV);
+}
+
+void PIC16TargetAsmInfo::SetSectionForGVs(Module &M) {
+ for (Module::global_iterator I = M.global_begin(), E = M.global_end();
+ I != E; ++I) {
+ if (!I->hasInitializer()) // External global require no code.
+ continue;
+
+ // Any variables reaching here with "." in its name is a local scope
+ // variable and should not be printed in global data section.
+ std::string name = I->getName();
+ if (name.find(".auto.") != std::string::npos
+ || name.find(".arg.") != std::string::npos)
+ continue;
+ int AddrSpace = I->getType()->getAddressSpace();
+
+ if (AddrSpace == PIC16ISD::RAM_SPACE)
+ I->setSection(SectionForGlobal(I)->getName());
+ }
+}
+
+
+// Helper routine.
+// Func name starts after prefix and followed by a .
+static std::string getFuncNameForSym(const std::string &Sym,
+ PIC16ABINames::IDs PrefixType) {
+
+ const char *prefix = getIDName (PIC16ABINames::PREFIX_SYMBOL);
+
+ // This name may or may not start with prefix;
+ // Func names start after prfix in that case.
+ size_t func_name_start = 0;
+ if (Sym.find(prefix, 0, strlen(prefix)) != std::string::npos)
+ func_name_start = strlen(prefix);
+
+ // Position of the . after func name.
+ size_t func_name_end = Sym.find ('.', func_name_start);
+
+ return Sym.substr (func_name_start, func_name_end);
+}
+
+// Helper routine to create a section name given the section prefix
+// and func name.
+static std::string
+getSectionNameForFunc (const std::string &Fname,
+ const PIC16ABINames::IDs sec_id) {
+ std::string sec_id_string = getIDName (sec_id);
+ return sec_id_string + "." + Fname + ".#";
+}
+
+
+// Get the section for the given external symbol names.
+// This function is meant for only mangled external symbol names.
+std::string
+llvm::getSectionNameForSym(const std::string &Sym) {
+ std::string SectionName;
+
+ PIC16ABINames::IDs id = getID (Sym);
+ std::string Fname = getFuncNameForSym (Sym, id);
+
+ switch (id) {
+ default : assert (0 && "Could not determine external symbol type");
+ case PIC16ABINames::FUNC_FRAME:
+ case PIC16ABINames::FUNC_RET:
+ case PIC16ABINames::FUNC_TEMPS:
+ case PIC16ABINames::FUNC_ARGS: {
+ return getSectionNameForFunc (Fname, PIC16ABINames::FRAME_SECTION);
+ }
+ case PIC16ABINames::FUNC_AUTOS: {
+ return getSectionNameForFunc (Fname, PIC16ABINames::AUTOS_SECTION);
+ }
+ }
+}
+
+PIC16TargetAsmInfo::~PIC16TargetAsmInfo() {
+
+ for (unsigned i = 0; i < BSSSections.size(); i++) {
+ delete BSSSections[i];
+ }
+
+ for (unsigned i = 0; i < IDATASections.size(); i++) {
+ delete IDATASections[i];
+ }
+}