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Implement the .ltorg directive for ARM assembly 

This directive will write out the assembler-maintained constant
pool for the current section. These constant pools are created to
support the ldr-pseudo instruction (e.g. ldr r0, =val).

The directive can be used by the programmer to place the constant
pool in a location that can be reached by a pc-relative offset in
the ldr instruction.

llvm-svn: 197711
This commit is contained in:
David Peixotto 2013-12-19 18:26:07 +00:00
parent d618025910
commit 80c083a678
3 changed files with 310 additions and 0 deletions
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21
llvm/lib/Target/ARM/AsmParser/ARMAsmParser.cpp
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@ -115,6 +115,10 @@ class ARMAsmParser : public MCTargetAsmParser {
return ConstantPools[Section];
}
void destroyConstantPool(const MCSection *Section) {
ConstantPools.erase(Section);
}
ARMTargetStreamer &getTargetStreamer() {
MCTargetStreamer &TS = getParser().getStreamer().getTargetStreamer();
return static_cast<ARMTargetStreamer &>(TS);
@ -211,6 +215,7 @@ class ARMAsmParser : public MCTargetAsmParser {
bool parseDirectivePad(SMLoc L);
bool parseDirectiveRegSave(SMLoc L, bool IsVector);
bool parseDirectiveInst(SMLoc L, char Suffix = '\0');
bool parseDirectiveLtorg(SMLoc L);
StringRef splitMnemonic(StringRef Mnemonic, unsigned &PredicationCode,
bool &CarrySetting, unsigned &ProcessorIMod,
@ -7894,6 +7899,8 @@ bool ARMAsmParser::ParseDirective(AsmToken DirectiveID) {
return parseDirectiveInst(DirectiveID.getLoc(), 'n');
else if (IDVal == ".inst.w")
return parseDirectiveInst(DirectiveID.getLoc(), 'w');
else if (IDVal == ".ltorg")
return parseDirectiveLtorg(DirectiveID.getLoc());
return true;
}
@ -8445,6 +8452,20 @@ bool ARMAsmParser::parseDirectiveInst(SMLoc Loc, char Suffix) {
return false;
}
/// parseDirectiveLtorg
/// ::= .ltorg
bool ARMAsmParser::parseDirectiveLtorg(SMLoc L) {
MCStreamer &Streamer = getParser().getStreamer();
const MCSection *Section = Streamer.getCurrentSection().first;
if (ConstantPool *CP = getConstantPool(Section)) {
CP->emitEntries(Streamer);
CP = 0;
destroyConstantPool(Section);
}
return false;
}
/// Force static initialization.
extern "C" void LLVMInitializeARMAsmParser() {
RegisterMCAsmParser<ARMAsmParser> X(TheARMTarget);

151
llvm/test/MC/ARM/ltorg-darwin.s Normal file
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@ -0,0 +1,151 @@
@ This test has a partner (ltorg.s) that contains matching
@ tests for the .ltorg on linux targets. We need separate files
@ because the syntax for switching sections and temporary labels differs
@ between darwin and linux. Any tests added here should have a matching
@ test added there.
@RUN: llvm-mc -triple armv7-apple-darwin %s | FileCheck %s
@RUN: llvm-mc -triple thumbv5-apple-darwin %s | FileCheck %s
@RUN: llvm-mc -triple thumbv7-apple-darwin %s | FileCheck %s
@ check that ltorg dumps the constant pool at the current location
.section __TEXT,a,regular,pure_instructions
@ CHECK-LABEL: f2:
f2:
ldr r0, =0x10001
@ CHECK: ldr r0, Ltmp0
adds r0, r0, #1
adds r0, r0, #1
b f3
.ltorg
@ constant pool
@ CHECK: .align 2
@ CHECK: .data_region
@ CHECK-LABEL: Ltmp0:
@ CHECK: .long 65537
@ CHECK: .end_data_region
@ CHECK-LABEL: f3:
f3:
adds r0, r0, #1
adds r0, r0, #1
@ check that ltorg clears the constant pool after dumping it
.section __TEXT,b,regular,pure_instructions
@ CHECK-LABEL: f4:
f4:
ldr r0, =0x10002
@ CHECK: ldr r0, Ltmp1
adds r0, r0, #1
adds r0, r0, #1
b f5
.ltorg
@ constant pool
@ CHECK: .align 2
@ CHECK: .data_region
@ CHECK-LABEL: Ltmp1:
@ CHECK: .long 65538
@ CHECK: .end_data_region
@ CHECK-LABEL: f5:
f5:
adds r0, r0, #1
adds r0, r0, #1
ldr r0, =0x10003
@ CHECK: ldr r0, Ltmp2
adds r0, r0, #1
b f6
.ltorg
@ constant pool
@ CHECK: .align 2
@ CHECK: .data_region
@ CHECK-LABEL: Ltmp2:
@ CHECK: .long 65539
@ CHECK: .end_data_region
@ CHECK-LABEL: f6:
f6:
adds r0, r0, #1
adds r0, r0, #1
@ check that ltorg does not issue an error if there is no constant pool
.section __TEXT,c,regular,pure_instructions
@ CHECK-LABEL: f7:
f7:
adds r0, r0, #1
b f8
.ltorg
f8:
adds r0, r0, #1
@ check that ltorg works for labels
.section __TEXT,d,regular,pure_instructions
@ CHECK-LABEL: f9:
f9:
adds r0, r0, #1
adds r0, r0, #1
ldr r0, =bar
@ CHECK: ldr r0, Ltmp3
adds r0, r0, #1
adds r0, r0, #1
adds r0, r0, #1
b f10
.ltorg
@ constant pool
@ CHECK: .align 2
@ CHECK: .data_region
@ CHECK-LABEL: Ltmp3:
@ CHECK: .long bar
@ CHECK: .end_data_region
@ CHECK-LABEL: f10:
f10:
adds r0, r0, #1
adds r0, r0, #1
@ check that use of ltorg does not prevent dumping non-empty constant pools at end of section
.section __TEXT,e,regular,pure_instructions
@ CHECK-LABEL: f11:
f11:
adds r0, r0, #1
adds r0, r0, #1
ldr r0, =0x10004
@ CHECK: ldr r0, Ltmp4
b f12
.ltorg
@ constant pool
@ CHECK: .align 2
@ CHECK: .data_region
@ CHECK-LABEL: Ltmp4:
@ CHECK: .long 65540
@ CHECK: .end_data_region
@ CHECK-LABEL: f12:
f12:
adds r0, r0, #1
ldr r0, =0x10005
@ CHECK: ldr r0, Ltmp5
.section __TEXT,f,regular,pure_instructions
@ CHECK-LABEL: f13
f13:
adds r0, r0, #1
adds r0, r0, #1
@ should not have a constant pool at end of section with empty constant pools
@ CHECK-NOT: .section __TEXT,a,regular,pure_instructions
@ CHECK-NOT: .section __TEXT,b,regular,pure_instructions
@ CHECK-NOT: .section __TEXT,c,regular,pure_instructions
@ CHECK-NOT: .section __TEXT,d,regular,pure_instructions
@ should have a non-empty constant pool at end of this section
@ CHECK: .section __TEXT,e,regular,pure_instructions
@ constant pool
@ CHECK: .align 2
@ CHECK: .data_region
@ CHECK-LABEL: Ltmp5:
@ CHECK: .long 65541
@ CHECK: .end_data_region
@ should not have a constant pool at end of section with empty constant pools
@ CHECK-NOT: .section __TEXT,f,regular,pure_instructions

138
llvm/test/MC/ARM/ltorg.s Normal file
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@ -0,0 +1,138 @@
@ This test has a partner (ltorg-darwin.s) that contains matching
@ tests for the .ltorg on darwin targets. We need separate files
@ because the syntax for switching sections and temporary labels differs
@ between darwin and linux. Any tests added here should have a matching
@ test added there.
@RUN: llvm-mc -triple armv7-unknown-linux-gnueabi %s | FileCheck %s
@RUN: llvm-mc -triple thumbv5-unknown-linux-gnueabi %s | FileCheck %s
@RUN: llvm-mc -triple thumbv7-unknown-linux-gnueabi %s | FileCheck %s
@ check that ltorg dumps the constant pool at the current location
.section a,"ax",%progbits
@ CHECK-LABEL: f2:
f2:
ldr r0, =0x10001
@ CHECK: ldr r0, .Ltmp0
adds r0, r0, #1
adds r0, r0, #1
b f3
.ltorg
@ constant pool
@ CHECK: .align 2
@ CHECK-LABEL: .Ltmp0:
@ CHECK: .long 65537
@ CHECK-LABEL: f3:
f3:
adds r0, r0, #1
adds r0, r0, #1
@ check that ltorg clears the constant pool after dumping it
.section b,"ax",%progbits
@ CHECK-LABEL: f4:
f4:
ldr r0, =0x10002
@ CHECK: ldr r0, .Ltmp1
adds r0, r0, #1
adds r0, r0, #1
b f5
.ltorg
@ constant pool
@ CHECK: .align 2
@ CHECK-LABEL: .Ltmp1:
@ CHECK: .long 65538
@ CHECK-LABEL: f5:
f5:
adds r0, r0, #1
adds r0, r0, #1
ldr r0, =0x10003
@ CHECK: ldr r0, .Ltmp2
adds r0, r0, #1
b f6
.ltorg
@ constant pool
@ CHECK: .align 2
@ CHECK-LABEL: .Ltmp2:
@ CHECK: .long 65539
@ CHECK-LABEL: f6:
f6:
adds r0, r0, #1
adds r0, r0, #1
@ check that ltorg does not issue an error if there is no constant pool
.section c,"ax",%progbits
@ CHECK-LABEL: f7:
f7:
adds r0, r0, #1
b f8
.ltorg
f8:
adds r0, r0, #1
@ check that ltorg works for labels
.section d,"ax",%progbits
@ CHECK-LABEL: f9:
f9:
adds r0, r0, #1
adds r0, r0, #1
ldr r0, =bar
@ CHECK: ldr r0, .Ltmp3
adds r0, r0, #1
adds r0, r0, #1
adds r0, r0, #1
b f10
.ltorg
@ constant pool
@ CHECK: .align 2
@ CHECK-LABEL: .Ltmp3:
@ CHECK: .long bar
@ CHECK-LABEL: f10:
f10:
adds r0, r0, #1
adds r0, r0, #1
@ check that use of ltorg does not prevent dumping non-empty constant pools at end of section
.section e,"ax",%progbits
@ CHECK-LABEL: f11:
f11:
adds r0, r0, #1
adds r0, r0, #1
ldr r0, =0x10004
@ CHECK: ldr r0, .Ltmp4
b f12
.ltorg
@ constant pool
@ CHECK: .align 2
@ CHECK-LABEL: .Ltmp4:
@ CHECK: .long 65540
@ CHECK-LABEL: f12:
f12:
adds r0, r0, #1
ldr r0, =0x10005
@ CHECK: ldr r0, .Ltmp5
.section f,"ax",%progbits
@ CHECK-LABEL: f13
f13:
adds r0, r0, #1
adds r0, r0, #1
@ should not have a constant pool at end of section with empty constant pools
@ CHECK-NOT: .section a,"ax",%progbits
@ CHECK-NOT: .section b,"ax",%progbits
@ CHECK-NOT: .section c,"ax",%progbits
@ CHECK-NOT: .section d,"ax",%progbits
@ should have a non-empty constant pool at end of this section
@ CHECK: .section e,"ax",%progbits
@ constant pool
@ CHECK: .align 2
@ CHECK-LABEL: .Ltmp5:
@ CHECK: .long 65541
@ should not have a constant pool at end of section with empty constant pools
@ CHECK-NOT: .section f,"ax",%progbits