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-rw-r--r--lld/ELF/LinkerScript.cpp60
-rw-r--r--lld/ELF/LinkerScript.h75
2 files changed, 63 insertions, 72 deletions
diff --git a/lld/ELF/LinkerScript.cpp b/lld/ELF/LinkerScript.cpp
index 244679da769..647725ebf67 100644
--- a/lld/ELF/LinkerScript.cpp
+++ b/lld/ELF/LinkerScript.cpp
@@ -104,8 +104,7 @@ uint64_t LinkerScriptBase::getOutputSectionSize(StringRef Name) {
return 0;
}
-template <class ELFT>
-void LinkerScript<ELFT>::setDot(Expr E, const Twine &Loc, bool InSec) {
+void LinkerScriptBase::setDot(Expr E, const Twine &Loc, bool InSec) {
uint64_t Val = E();
if (Val < Dot) {
if (InSec)
@@ -123,8 +122,7 @@ void LinkerScript<ELFT>::setDot(Expr E, const Twine &Loc, bool InSec) {
// Sets value of a symbol. Two kinds of symbols are processed: synthetic
// symbols, whose value is an offset from beginning of section and regular
// symbols whose value is absolute.
-template <class ELFT>
-void LinkerScript<ELFT>::assignSymbol(SymbolAssignment *Cmd, bool InSec) {
+void LinkerScriptBase::assignSymbol(SymbolAssignment *Cmd, bool InSec) {
if (Cmd->Name == ".") {
setDot(Cmd->Expression, Cmd->Location, InSec);
return;
@@ -191,7 +189,7 @@ static StringRef basename(InputSectionBase *S) {
return "";
}
-template <class ELFT> bool LinkerScript<ELFT>::shouldKeep(InputSectionBase *S) {
+bool LinkerScriptBase::shouldKeep(InputSectionBase *S) {
for (InputSectionDescription *ID : Opt.KeptSections)
if (ID->FilePat.match(basename(S)))
for (SectionPattern &P : ID->SectionPatterns)
@@ -248,8 +246,7 @@ static void sortSections(InputSectionBase **Begin, InputSectionBase **End,
}
// Compute and remember which sections the InputSectionDescription matches.
-template <class ELFT>
-void LinkerScript<ELFT>::computeInputSections(InputSectionDescription *I) {
+void LinkerScriptBase::computeInputSections(InputSectionDescription *I) {
// Collects all sections that satisfy constraints of I
// and attach them to I.
for (SectionPattern &Pat : I->SectionPatterns) {
@@ -306,9 +303,8 @@ void LinkerScript<ELFT>::discard(ArrayRef<InputSectionBase *> V) {
}
}
-template <class ELFT>
std::vector<InputSectionBase *>
-LinkerScript<ELFT>::createInputSectionList(OutputSectionCommand &OutCmd) {
+LinkerScriptBase::createInputSectionList(OutputSectionCommand &OutCmd) {
std::vector<InputSectionBase *> Ret;
for (const std::unique_ptr<BaseCommand> &Base : OutCmd.Commands) {
@@ -406,8 +402,7 @@ void LinkerScript<ELFT>::processCommands(OutputSectionFactory &Factory) {
}
// Add sections that didn't match any sections command.
-template <class ELFT>
-void LinkerScript<ELFT>::addOrphanSections(OutputSectionFactory &Factory) {
+void LinkerScriptBase::addOrphanSections(OutputSectionFactory &Factory) {
for (InputSectionBase *S : InputSections)
if (S->Live && !S->OutSec)
Factory.addInputSec(S, getOutputSectionName(S->Name));
@@ -417,7 +412,7 @@ static bool isTbss(OutputSection *Sec) {
return (Sec->Flags & SHF_TLS) && Sec->Type == SHT_NOBITS;
}
-template <class ELFT> void LinkerScript<ELFT>::output(InputSection *S) {
+void LinkerScriptBase::output(InputSection *S) {
if (!AlreadyOutputIS.insert(S).second)
return;
bool IsTbss = isTbss(CurOutSec);
@@ -451,7 +446,7 @@ template <class ELFT> void LinkerScript<ELFT>::output(InputSection *S) {
Dot = Pos;
}
-template <class ELFT> void LinkerScript<ELFT>::flush() {
+void LinkerScriptBase::flush() {
assert(CurOutSec);
if (!AlreadyOutputOS.insert(CurOutSec).second)
return;
@@ -459,7 +454,7 @@ template <class ELFT> void LinkerScript<ELFT>::flush() {
output(I);
}
-template <class ELFT> void LinkerScript<ELFT>::switchTo(OutputSection *Sec) {
+void LinkerScriptBase::switchTo(OutputSection *Sec) {
if (CurOutSec == Sec)
return;
if (AlreadyOutputOS.count(Sec))
@@ -478,7 +473,7 @@ template <class ELFT> void LinkerScript<ELFT>::switchTo(OutputSection *Sec) {
CurOutSec->LMAOffset = LMAOffset();
}
-template <class ELFT> void LinkerScript<ELFT>::process(BaseCommand &Base) {
+void LinkerScriptBase::process(BaseCommand &Base) {
// This handles the assignments to symbol or to a location counter (.)
if (auto *AssignCmd = dyn_cast<SymbolAssignment>(&Base)) {
assignSymbol(AssignCmd, true);
@@ -533,9 +528,8 @@ findSection(StringRef Name, const std::vector<OutputSection *> &Sections) {
// This function searches for a memory region to place the given output
// section in. If found, a pointer to the appropriate memory region is
// returned. Otherwise, a nullptr is returned.
-template <class ELFT>
-MemoryRegion *LinkerScript<ELFT>::findMemoryRegion(OutputSectionCommand *Cmd,
- OutputSection *Sec) {
+MemoryRegion *LinkerScriptBase::findMemoryRegion(OutputSectionCommand *Cmd,
+ OutputSection *Sec) {
// If a memory region name was specified in the output section command,
// then try to find that region first.
if (!Cmd->MemoryRegionName.empty()) {
@@ -568,8 +562,7 @@ MemoryRegion *LinkerScript<ELFT>::findMemoryRegion(OutputSectionCommand *Cmd,
// This function assigns offsets to input sections and an output section
// for a single sections command (e.g. ".text { *(.text); }").
-template <class ELFT>
-void LinkerScript<ELFT>::assignOffsets(OutputSectionCommand *Cmd) {
+void LinkerScriptBase::assignOffsets(OutputSectionCommand *Cmd) {
OutputSection *Sec = findSection(Cmd->Name, *OutputSections);
if (!Sec)
return;
@@ -606,7 +599,7 @@ void LinkerScript<ELFT>::assignOffsets(OutputSectionCommand *Cmd) {
[this](std::unique_ptr<BaseCommand> &B) { process(*B.get()); });
}
-template <class ELFT> void LinkerScript<ELFT>::removeEmptyCommands() {
+void LinkerScriptBase::removeEmptyCommands() {
// It is common practice to use very generic linker scripts. So for any
// given run some of the output sections in the script will be empty.
// We could create corresponding empty output sections, but that would
@@ -630,7 +623,7 @@ static bool isAllSectionDescription(const OutputSectionCommand &Cmd) {
return true;
}
-template <class ELFT> void LinkerScript<ELFT>::adjustSectionsBeforeSorting() {
+void LinkerScriptBase::adjustSectionsBeforeSorting() {
// If the output section contains only symbol assignments, create a
// corresponding output section. The bfd linker seems to only create them if
// '.' is assigned to, but creating these section should not have any bad
@@ -655,7 +648,7 @@ template <class ELFT> void LinkerScript<ELFT>::adjustSectionsBeforeSorting() {
}
}
-template <class ELFT> void LinkerScript<ELFT>::adjustSectionsAfterSorting() {
+void LinkerScriptBase::adjustSectionsAfterSorting() {
placeOrphanSections();
// If output section command doesn't specify any segments,
@@ -731,7 +724,7 @@ static bool shouldSkip(const BaseCommand &Cmd) {
// determine whether a new output command should be added before or
// after another commands. For the details, look at shouldSkip
// function.
-template <class ELFT> void LinkerScript<ELFT>::placeOrphanSections() {
+void LinkerScriptBase::placeOrphanSections() {
// The OutputSections are already in the correct order.
// This loops creates or moves commands as needed so that they are in the
// correct order.
@@ -786,8 +779,7 @@ template <class ELFT> void LinkerScript<ELFT>::placeOrphanSections() {
}
}
-template <class ELFT>
-void LinkerScript<ELFT>::assignAddresses(std::vector<PhdrEntry> &Phdrs) {
+void LinkerScriptBase::assignAddresses(std::vector<PhdrEntry> &Phdrs) {
// Assign addresses as instructed by linker script SECTIONS sub-commands.
Dot = 0;
switchTo(Aether);
@@ -819,7 +811,7 @@ void LinkerScript<ELFT>::assignAddresses(std::vector<PhdrEntry> &Phdrs) {
}
// Creates program headers as instructed by PHDRS linker script command.
-template <class ELFT> std::vector<PhdrEntry> LinkerScript<ELFT>::createPhdrs() {
+std::vector<PhdrEntry> LinkerScriptBase::createPhdrs() {
std::vector<PhdrEntry> Ret;
// Process PHDRS and FILEHDR keywords because they are not
@@ -854,7 +846,7 @@ template <class ELFT> std::vector<PhdrEntry> LinkerScript<ELFT>::createPhdrs() {
return Ret;
}
-template <class ELFT> bool LinkerScript<ELFT>::ignoreInterpSection() {
+bool LinkerScriptBase::ignoreInterpSection() {
// Ignore .interp section in case we have PHDRS specification
// and PT_INTERP isn't listed.
return !Opt.PhdrsCommands.empty() &&
@@ -863,7 +855,7 @@ template <class ELFT> bool LinkerScript<ELFT>::ignoreInterpSection() {
}) == Opt.PhdrsCommands.end();
}
-template <class ELFT> uint32_t LinkerScript<ELFT>::getFiller(StringRef Name) {
+uint32_t LinkerScriptBase::getFiller(StringRef Name) {
for (const std::unique_ptr<BaseCommand> &Base : Opt.Commands)
if (auto *Cmd = dyn_cast<OutputSectionCommand>(Base.get()))
if (Cmd->Name == Name)
@@ -905,7 +897,7 @@ void LinkerScript<ELFT>::writeDataBytes(StringRef Name, uint8_t *Buf) {
writeInt<ELFT>(Buf + Data->Offset, Data->Expression(), Data->Size);
}
-template <class ELFT> bool LinkerScript<ELFT>::hasLMA(StringRef Name) {
+bool LinkerScriptBase::hasLMA(StringRef Name) {
for (const std::unique_ptr<BaseCommand> &Base : Opt.Commands)
if (auto *Cmd = dyn_cast<OutputSectionCommand>(Base.get()))
if (Cmd->LMAExpr && Cmd->Name == Name)
@@ -917,7 +909,7 @@ template <class ELFT> bool LinkerScript<ELFT>::hasLMA(StringRef Name) {
// SECTIONS commands. Sections are laid out as the same order as they
// were in the script. If a given name did not appear in the script,
// it returns INT_MAX, so that it will be laid out at end of file.
-template <class ELFT> int LinkerScript<ELFT>::getSectionIndex(StringRef Name) {
+int LinkerScriptBase::getSectionIndex(StringRef Name) {
for (int I = 0, E = Opt.Commands.size(); I != E; ++I)
if (auto *Cmd = dyn_cast<OutputSectionCommand>(Opt.Commands[I].get()))
if (Cmd->Name == Name)
@@ -960,8 +952,7 @@ OutputSection *LinkerScript<ELFT>::getSymbolSection(StringRef S) {
// Returns indices of ELF headers containing specific section, identified
// by Name. Each index is a zero based number of ELF header listed within
// PHDRS {} script block.
-template <class ELFT>
-std::vector<size_t> LinkerScript<ELFT>::getPhdrIndices(StringRef SectionName) {
+std::vector<size_t> LinkerScriptBase::getPhdrIndices(StringRef SectionName) {
for (const std::unique_ptr<BaseCommand> &Base : Opt.Commands) {
auto *Cmd = dyn_cast<OutputSectionCommand>(Base.get());
if (!Cmd || Cmd->Name != SectionName)
@@ -975,8 +966,7 @@ std::vector<size_t> LinkerScript<ELFT>::getPhdrIndices(StringRef SectionName) {
return {};
}
-template <class ELFT>
-size_t LinkerScript<ELFT>::getPhdrIndex(const Twine &Loc, StringRef PhdrName) {
+size_t LinkerScriptBase::getPhdrIndex(const Twine &Loc, StringRef PhdrName) {
size_t I = 0;
for (PhdrsCommand &Cmd : Opt.PhdrsCommands) {
if (Cmd.Name == PhdrName)
diff --git a/lld/ELF/LinkerScript.h b/lld/ELF/LinkerScript.h
index fa8b4ce4ebd..3180f9913f1 100644
--- a/lld/ELF/LinkerScript.h
+++ b/lld/ELF/LinkerScript.h
@@ -229,6 +229,24 @@ extern ScriptConfiguration *ScriptConfig;
class LinkerScriptBase {
protected:
~LinkerScriptBase() = default;
+
+ void assignSymbol(SymbolAssignment *Cmd, bool InSec = false);
+ void computeInputSections(InputSectionDescription *);
+ void setDot(Expr E, const Twine &Loc, bool InSec = false);
+
+ std::vector<InputSectionBase *>
+ createInputSectionList(OutputSectionCommand &Cmd);
+
+ std::vector<size_t> getPhdrIndices(StringRef SectionName);
+ size_t getPhdrIndex(const Twine &Loc, StringRef PhdrName);
+
+ MemoryRegion *findMemoryRegion(OutputSectionCommand *Cmd, OutputSection *Sec);
+
+ void switchTo(OutputSection *Sec);
+ void flush();
+ void output(InputSection *Sec);
+ void process(BaseCommand &Base);
+
OutputSection *Aether;
// "ScriptConfig" is a bit too long, so define a short name for it.
@@ -237,6 +255,13 @@ protected:
uint64_t Dot;
uint64_t ThreadBssOffset = 0;
+ std::function<uint64_t()> LMAOffset;
+ OutputSection *CurOutSec = nullptr;
+ MemoryRegion *CurMemRegion = nullptr;
+
+ llvm::DenseSet<OutputSection *> AlreadyOutputOS;
+ llvm::DenseSet<InputSectionBase *> AlreadyOutputIS;
+
public:
bool hasPhdrsCommands() { return !Opt.PhdrsCommands.empty(); }
uint64_t getDot() { return Dot; }
@@ -249,15 +274,6 @@ public:
virtual OutputSection *getSymbolSection(StringRef S) = 0;
std::vector<OutputSection *> *OutputSections;
-};
-
-// This is a runner of the linker script.
-template <class ELFT> class LinkerScript final : public LinkerScriptBase {
-public:
- LinkerScript();
- ~LinkerScript();
-
- void processCommands(OutputSectionFactory &Factory);
void addOrphanSections(OutputSectionFactory &Factory);
void removeEmptyCommands();
void adjustSectionsBeforeSorting();
@@ -267,44 +283,29 @@ public:
bool ignoreInterpSection();
uint32_t getFiller(StringRef Name);
- void writeDataBytes(StringRef Name, uint8_t *Buf);
bool hasLMA(StringRef Name);
bool shouldKeep(InputSectionBase *S);
void assignOffsets(OutputSectionCommand *Cmd);
void placeOrphanSections();
void assignAddresses(std::vector<PhdrEntry> &Phdrs);
- uint64_t getSymbolValue(const Twine &Loc, StringRef S) override;
- bool isDefined(StringRef S) override;
- bool isAbsolute(StringRef S) override;
- OutputSection *getSymbolSection(StringRef S) override;
-
int getSectionIndex(StringRef Name);
+};
-private:
- void assignSymbol(SymbolAssignment *Cmd, bool InSec = false);
- void addSymbol(SymbolAssignment *Cmd);
- void computeInputSections(InputSectionDescription *);
- void setDot(Expr E, const Twine &Loc, bool InSec = false);
+// This is a runner of the linker script.
+template <class ELFT> class LinkerScript final : public LinkerScriptBase {
+public:
+ LinkerScript();
+ ~LinkerScript();
+ void writeDataBytes(StringRef Name, uint8_t *Buf);
+ void addSymbol(SymbolAssignment *Cmd);
void discard(ArrayRef<InputSectionBase *> V);
+ void processCommands(OutputSectionFactory &Factory);
- std::vector<InputSectionBase *>
- createInputSectionList(OutputSectionCommand &Cmd);
-
- std::vector<size_t> getPhdrIndices(StringRef SectionName);
- size_t getPhdrIndex(const Twine &Loc, StringRef PhdrName);
-
- MemoryRegion *findMemoryRegion(OutputSectionCommand *Cmd, OutputSection *Sec);
-
- std::function<uint64_t()> LMAOffset;
- OutputSection *CurOutSec = nullptr;
- MemoryRegion *CurMemRegion = nullptr;
- void switchTo(OutputSection *Sec);
- void flush();
- void output(InputSection *Sec);
- void process(BaseCommand &Base);
- llvm::DenseSet<OutputSection *> AlreadyOutputOS;
- llvm::DenseSet<InputSectionBase *> AlreadyOutputIS;
+ uint64_t getSymbolValue(const Twine &Loc, StringRef S) override;
+ bool isDefined(StringRef S) override;
+ bool isAbsolute(StringRef S) override;
+ OutputSection *getSymbolSection(StringRef S) override;
};
// Variable template is a C++14 feature, so we can't template
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