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Add a couple more fields, move ctor init list to .cpp file, add support
for emitting the ctor/dtor list for common targets. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@24694 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -22,6 +22,7 @@
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namespace llvm {
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class Constant;
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class Mangler;
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class GlobalVariable;
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class AsmPrinter : public MachineFunctionPass {
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/// CurrentSection - The current section we are emitting to. This is
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@ -134,6 +135,16 @@ namespace llvm {
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/// before emitting the constant pool for a function.
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const char *ConstantPoolSection; // Defaults to "\t.section .rodata\n"
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/// StaticCtorsSection - This is the directive that is emitted to switch to
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/// a section to emit the static constructor list.
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/// Defaults to "\t.section .ctors,\"aw\",@progbits".
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const char *StaticCtorsSection;
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/// StaticDtorsSection - This is the directive that is emitted to switch to
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/// a section to emit the static destructor list.
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/// Defaults to "\t.section .dtors,\"aw\",@progbits".
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const char *StaticDtorsSection;
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//===--- Global Variable Emission Directives --------------------------===//
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/// LCOMMDirective - This is the name of a directive (if supported) that can
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@ -152,31 +163,7 @@ namespace llvm {
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/// directives, this is true for most ELF targets.
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bool HasDotTypeDotSizeDirective; // Defaults to true.
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AsmPrinter(std::ostream &o, TargetMachine &tm)
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: FunctionNumber(0), O(o), TM(tm),
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CommentString("#"),
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GlobalPrefix(""),
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PrivateGlobalPrefix("."),
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GlobalVarAddrPrefix(""),
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GlobalVarAddrSuffix(""),
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FunctionAddrPrefix(""),
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FunctionAddrSuffix(""),
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ZeroDirective("\t.zero\t"),
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AsciiDirective("\t.ascii\t"),
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AscizDirective("\t.asciz\t"),
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Data8bitsDirective("\t.byte\t"),
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Data16bitsDirective("\t.short\t"),
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Data32bitsDirective("\t.long\t"),
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Data64bitsDirective("\t.quad\t"),
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AlignDirective("\t.align\t"),
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AlignmentIsInBytes(true),
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SwitchToSectionDirective("\t.section\t"),
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ConstantPoolSection("\t.section .rodata\n"),
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LCOMMDirective(0),
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COMMDirective("\t.comm\t"),
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COMMDirectiveTakesAlignment(true),
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HasDotTypeDotSizeDirective(true) {
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}
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AsmPrinter(std::ostream &o, TargetMachine &TM);
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/// SwitchSection - Switch to the specified section of the executable if we
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/// are not already in it! If GV is non-null and if the global has an
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@ -210,8 +197,18 @@ namespace llvm {
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/// is being processed from runOnMachineFunction.
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void SetupMachineFunction(MachineFunction &MF);
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/// EmitConstantPool - Print to the current output stream assembly
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/// representations of the constants in the constant pool MCP. This is
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/// used to print out constants which have been "spilled to memory" by
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/// the code generator.
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///
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void EmitConstantPool(MachineConstantPool *MCP);
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/// EmitSpecialLLVMGlobal - Check to see if the specified global is a
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/// special global used by LLVM. If so, emit it and return true, otherwise
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/// do nothing and return false.
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bool EmitSpecialLLVMGlobal(const GlobalVariable *GV);
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/// EmitAlignment - Emit an alignment directive to the specified power of
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/// two boundary. For example, if you pass in 3 here, you will get an 8
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/// byte alignment. If a global value is specified, and if that global has
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@ -229,6 +226,9 @@ namespace llvm {
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/// EmitGlobalConstant - Print a general LLVM constant to the .s file.
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///
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void EmitGlobalConstant(const Constant* CV);
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private:
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void EmitXXStructorList(Constant *List);
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};
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}
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@ -21,6 +21,35 @@
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#include "llvm/Target/TargetMachine.h"
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using namespace llvm;
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AsmPrinter::AsmPrinter(std::ostream &o, TargetMachine &tm)
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: FunctionNumber(0), O(o), TM(tm),
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CommentString("#"),
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GlobalPrefix(""),
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PrivateGlobalPrefix("."),
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GlobalVarAddrPrefix(""),
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GlobalVarAddrSuffix(""),
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FunctionAddrPrefix(""),
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FunctionAddrSuffix(""),
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ZeroDirective("\t.zero\t"),
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AsciiDirective("\t.ascii\t"),
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AscizDirective("\t.asciz\t"),
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Data8bitsDirective("\t.byte\t"),
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Data16bitsDirective("\t.short\t"),
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Data32bitsDirective("\t.long\t"),
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Data64bitsDirective("\t.quad\t"),
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AlignDirective("\t.align\t"),
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AlignmentIsInBytes(true),
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SwitchToSectionDirective("\t.section\t"),
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ConstantPoolSection("\t.section .rodata\n"),
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StaticCtorsSection("\t.section .ctors,\"aw\",@progbits"),
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StaticDtorsSection("\t.section .dtors,\"aw\",@progbits"),
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LCOMMDirective(0),
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COMMDirective("\t.comm\t"),
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COMMDirectiveTakesAlignment(true),
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HasDotTypeDotSizeDirective(true) {
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}
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/// SwitchSection - Switch to the specified section of the executable if we
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/// are not already in it!
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///
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@ -80,6 +109,47 @@ void AsmPrinter::EmitConstantPool(MachineConstantPool *MCP) {
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}
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}
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/// EmitSpecialLLVMGlobal - Check to see if the specified global is a
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/// special global used by LLVM. If so, emit it and return true, otherwise
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/// do nothing and return false.
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bool AsmPrinter::EmitSpecialLLVMGlobal(const GlobalVariable *GV) {
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assert(GV->hasInitializer() && GV->hasAppendingLinkage() &&
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"Not a special LLVM global!");
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if (GV->getName() == "llvm.used")
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return true; // No need to emit this at all.
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if (GV->getName() == "llvm.global_ctors") {
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SwitchSection(StaticCtorsSection, 0);
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EmitAlignment(2, 0);
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EmitXXStructorList(GV->getInitializer());
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return true;
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}
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if (GV->getName() == "llvm.global_dtors") {
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SwitchSection(StaticDtorsSection, 0);
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EmitAlignment(2, 0);
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EmitXXStructorList(GV->getInitializer());
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return true;
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}
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return false;
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}
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/// EmitXXStructorList - Emit the ctor or dtor list. This just prints out the
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/// function pointers, ignoring the init priority.
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void AsmPrinter::EmitXXStructorList(Constant *List) {
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// Should be an array of '{ int, void ()* }' structs. The first value is the
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// init priority, which we ignore.
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if (!isa<ConstantArray>(List)) return;
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ConstantArray *InitList = cast<ConstantArray>(List);
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for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i)
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if (ConstantStruct *CS = dyn_cast<ConstantStruct>(InitList->getOperand(i))){
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if (CS->getNumOperands() != 2) return; // Not array of 2-element structs.
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// Emit the function pointer.
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EmitGlobalConstant(CS->getOperand(1));
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}
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}
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// EmitAlignment - Emit an alignment directive to the specified power of two.
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