[llvm-commits] [llvm] r101106 - in /llvm/trunk: include/llvm/Target/TargetMachine.h lib/CodeGen/TargetLoweringObjectFileImpl.cpp lib/Target/TargetMachine.cpp test/CodeGen/X86/global-sections.ll
Chris Lattner
sabre at nondot.org
Mon Apr 12 17:36:43 PDT 2010
Author: lattner
Date: Mon Apr 12 19:36:43 2010
New Revision: 101106
URL: http://llvm.org/viewvc/llvm-project?rev=101106&view=rev
Log:
add llvm codegen support for -ffunction-sections and -fdata-sections,
patch by Sylvere Teissier!
Modified:
llvm/trunk/include/llvm/Target/TargetMachine.h
llvm/trunk/lib/CodeGen/TargetLoweringObjectFileImpl.cpp
llvm/trunk/lib/Target/TargetMachine.cpp
llvm/trunk/test/CodeGen/X86/global-sections.ll
Modified: llvm/trunk/include/llvm/Target/TargetMachine.h
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/include/llvm/Target/TargetMachine.h?rev=101106&r1=101105&r2=101106&view=diff
==============================================================================
--- llvm/trunk/include/llvm/Target/TargetMachine.h (original)
+++ llvm/trunk/include/llvm/Target/TargetMachine.h Mon Apr 12 19:36:43 2010
@@ -171,6 +171,21 @@
/// is false.
static void setAsmVerbosityDefault(bool);
+ /// getDataSections - Return true if data objects should be emitted into their
+ /// own section, corresponds to -fdata-sections.
+ static bool getDataSections();
+
+ /// getFunctionSections - Return true if functions should be emitted into
+ /// their own section, corresponding to -ffunction-sections.
+ static bool getFunctionSections();
+
+ /// setDataSections - Set if the data are emit into separate sections.
+ static void setDataSections(bool);
+
+ /// setFunctionSections - Set if the functions are emit into separate
+ /// sections.
+ static void setFunctionSections(bool);
+
/// CodeGenFileType - These enums are meant to be passed into
/// addPassesToEmitFile to indicate what type of file to emit, and returned by
/// it to indicate what type of file could actually be made.
Modified: llvm/trunk/lib/CodeGen/TargetLoweringObjectFileImpl.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/TargetLoweringObjectFileImpl.cpp?rev=101106&r1=101105&r2=101106&view=diff
==============================================================================
--- llvm/trunk/lib/CodeGen/TargetLoweringObjectFileImpl.cpp (original)
+++ llvm/trunk/lib/CodeGen/TargetLoweringObjectFileImpl.cpp Mon Apr 12 19:36:43 2010
@@ -279,14 +279,48 @@
return ".gnu.linkonce.d.rel.ro.";
}
+/// getSectionPrefixForGlobal - Return the section prefix name used by options
+/// FunctionsSections and DataSections.
+static const char *getSectionPrefixForGlobal(SectionKind Kind) {
+ if (Kind.isText()) return ".text.";
+ if (Kind.isReadOnly()) return ".rodata.";
+
+ if (Kind.isThreadData()) return ".tdata.";
+ if (Kind.isThreadBSS()) return ".tbss.";
+
+ if (Kind.isDataNoRel()) return ".data.";
+ if (Kind.isDataRelLocal()) return ".data.rel.local.";
+ if (Kind.isDataRel()) return ".data.rel.";
+ if (Kind.isReadOnlyWithRelLocal()) return ".data.rel.ro.local.";
+
+ assert(Kind.isReadOnlyWithRel() && "Unknown section kind");
+ return ".data.rel.ro.";
+}
+
+
const MCSection *TargetLoweringObjectFileELF::
SelectSectionForGlobal(const GlobalValue *GV, SectionKind Kind,
Mangler *Mang, const TargetMachine &TM) const {
+ // If we have -ffunction-section or -fdata-section then we should emit the
+ // global value to a uniqued section specifically for it.
+ bool EmitUniquedSection;
+ if (Kind.isText())
+ EmitUniquedSection = TM.getFunctionSections();
+ else
+ EmitUniquedSection = TM.getDataSections();
// If this global is linkonce/weak and the target handles this by emitting it
// into a 'uniqued' section name, create and return the section now.
- if (GV->isWeakForLinker() && !Kind.isCommon() && !Kind.isBSS()) {
- const char *Prefix = getSectionPrefixForUniqueGlobal(Kind);
+ if ((GV->isWeakForLinker() || EmitUniquedSection) &&
+ !Kind.isCommon() && !Kind.isBSS()) {
+ const char *Prefix;
+ if (GV->isWeakForLinker())
+ Prefix = getSectionPrefixForUniqueGlobal(Kind);
+ else {
+ assert(EmitUniquedSection);
+ Prefix = getSectionPrefixForGlobal(Kind);
+ }
+
SmallString<128> Name(Prefix, Prefix+strlen(Prefix));
MCSymbol *Sym = Mang->getSymbol(GV);
Name.append(Sym->getName().begin(), Sym->getName().end());
Modified: llvm/trunk/lib/Target/TargetMachine.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/TargetMachine.cpp?rev=101106&r1=101105&r2=101106&view=diff
==============================================================================
--- llvm/trunk/lib/Target/TargetMachine.cpp (original)
+++ llvm/trunk/lib/Target/TargetMachine.cpp Mon Apr 12 19:36:43 2010
@@ -197,7 +197,14 @@
cl::desc("Use strong PHI elimination."),
cl::location(StrongPHIElim),
cl::init(false));
-
+static cl::opt<bool>
+DataSections("fdata-sections",
+ cl::desc("Emit data into separate sections"),
+ cl::init(false));
+static cl::opt<bool>
+FunctionSections("ffunction-sections",
+ cl::desc("Emit functions into separate sections"),
+ cl::init(false));
//---------------------------------------------------------------------------
// TargetMachine Class
//
@@ -244,6 +251,22 @@
AsmVerbosityDefault = V;
}
+bool TargetMachine::getFunctionSections() {
+ return FunctionSections;
+}
+
+bool TargetMachine::getDataSections() {
+ return DataSections;
+}
+
+void TargetMachine::setFunctionSections(bool V) {
+ FunctionSections = V;
+}
+
+void TargetMachine::setDataSections(bool V) {
+ DataSections = V;
+}
+
namespace llvm {
/// LessPreciseFPMAD - This flag return true when -enable-fp-mad option
/// is specified on the command line. When this flag is off(default), the
Modified: llvm/trunk/test/CodeGen/X86/global-sections.ll
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/CodeGen/X86/global-sections.ll?rev=101106&r1=101105&r2=101106&view=diff
==============================================================================
--- llvm/trunk/test/CodeGen/X86/global-sections.ll (original)
+++ llvm/trunk/test/CodeGen/X86/global-sections.ll Mon Apr 12 19:36:43 2010
@@ -1,5 +1,6 @@
; RUN: llc < %s -mtriple=i386-unknown-linux-gnu | FileCheck %s -check-prefix=LINUX
; RUN: llc < %s -mtriple=i386-apple-darwin9.7 | FileCheck %s -check-prefix=DARWIN
+; RUN: llc < %s -mtriple=i386-unknown-linux-gnu -fdata-sections | FileCheck %s -check-prefix=LINUX-SECTIONS
; int G1;
@@ -32,6 +33,12 @@
; DARWIN: _G3:
; DARWIN: .long _G1
+; LINUX: .section .rodata,"a", at progbits
+; LINUX: .globl G3
+
+; LINUX-SECTIONS: .section .rodata.G3,"a", at progbits
+; LINUX-SECTIONS: .globl G3
+
; _Complex long long const G4 = 34;
@G4 = constant {i64,i64} { i64 34, i64 0 }
@@ -97,6 +104,9 @@
; LINUX: G7:
; LINUX: .asciz "abcdefghi"
+; LINUX-SECTIONS: .section .rodata.G7,"aMS", at progbits,1
+; LINUX-SECTIONS: .globl G7
+
@G8 = constant [4 x i16] [ i16 1, i16 2, i16 3, i16 0 ]
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