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Revert "[LLD][ELF] Don't spill to same memory region" #130815

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Merged
merged 1 commit into from
Mar 11, 2025
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Revert "[LLD][ELF] Don't spill to same memory region" #130815

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34 changes: 9 additions & 25 deletions lld/ELF/LinkerScript.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -563,7 +563,7 @@ LinkerScript::computeInputSections(const InputSectionDescription *cmd,
continue;

if (!cmd->matchesFile(*sec->file) || pat.excludesFile(*sec->file) ||
!flagsMatch(sec))
sec->parent == &outCmd || !flagsMatch(sec))
continue;

if (sec->parent) {
Expand Down Expand Up @@ -626,7 +626,7 @@ LinkerScript::computeInputSections(const InputSectionDescription *cmd,

for (InputSectionDescription *isd : scd->sc.commands) {
for (InputSectionBase *sec : isd->sectionBases) {
if (!flagsMatch(sec))
if (sec->parent == &outCmd || !flagsMatch(sec))
continue;
bool isSpill = sec->parent && isa<OutputSection>(sec->parent);
if (!sec->parent || (isSpill && outCmd.name == "/DISCARD/")) {
Expand Down Expand Up @@ -1585,32 +1585,16 @@ bool LinkerScript::spillSections() {
if (isa<PotentialSpillSection>(isec))
continue;

// Find the next potential spill location and remove it from the list.
auto it = potentialSpillLists.find(isec);
if (it == potentialSpillLists.end())
break;

// Consume spills until finding one that might help, then consume it.
PotentialSpillList &list = it->second;
PotentialSpillSection *spill;
for (spill = list.head; spill; spill = spill->next) {
if (list.head->next)
list.head = spill->next;
else
potentialSpillLists.erase(isec);

// Spills to the same region that overflowed cannot help.
if (hasRegionOverflowed(osec->memRegion) &&
spill->getParent()->memRegion == osec->memRegion)
continue;
if (hasRegionOverflowed(osec->lmaRegion) &&
spill->getParent()->lmaRegion == osec->lmaRegion)
continue;

// This spill might resolve the overflow.
break;
}
if (!spill)
continue;
PotentialSpillList &list = it->second;
PotentialSpillSection *spill = list.head;
if (spill->next)
list.head = spill->next;
else
potentialSpillLists.erase(isec);

// Replace the next spill location with the spilled section and adjust
// its properties to match the new location. Note that the alignment of
Expand Down
100 changes: 0 additions & 100 deletions lld/test/ELF/linkerscript/section-class.test
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Original file line number Diff line number Diff line change
Expand Up @@ -450,103 +450,3 @@ SECTIONS {

# TO-DISCARD: error: section '.two_byte_section' cannot spill from/to /DISCARD/
# TO-DISCARD-WARN: warning: section '.two_byte_section' cannot spill from/to /DISCARD/

#--- same-mem-region.lds
## Spills to the same memory region that overflowed do not consume address assignment passes.
MEMORY {
a : ORIGIN = 0, LENGTH = 0
b : ORIGIN = 0, LENGTH = 3
c : ORIGIN = 3, LENGTH = 3
d : ORIGIN = 6, LENGTH = 3
}
SECTIONS {
CLASS(class) { *(.one_byte_section .two_byte_section) }
.a00 : { CLASS(class) } >a AT>c
.a01 : { CLASS(class) } >a AT>d
.a02 : { CLASS(class) } >a AT>d
.a03 : { CLASS(class) } >a AT>d
.a04 : { CLASS(class) } >a AT>d
.a05 : { CLASS(class) } >a AT>d
.a06 : { CLASS(class) } >a AT>d
.a07 : { CLASS(class) } >a AT>d
.a08 : { CLASS(class) } >a AT>d
.a09 : { CLASS(class) } >a AT>d
.a10 : { CLASS(class) } >a AT>d
.a11 : { CLASS(class) } >a AT>d
.a12 : { CLASS(class) } >a AT>d
.a13 : { CLASS(class) } >a AT>d
.a14 : { CLASS(class) } >a AT>d
.a15 : { CLASS(class) } >a AT>d
.a16 : { CLASS(class) } >a AT>d
.a17 : { CLASS(class) } >a AT>d
.a18 : { CLASS(class) } >a AT>d
.a19 : { CLASS(class) } >a AT>d
.a20 : { CLASS(class) } >a AT>d
.a21 : { CLASS(class) } >a AT>d
.a22 : { CLASS(class) } >a AT>d
.a23 : { CLASS(class) } >a AT>d
.a24 : { CLASS(class) } >a AT>d
.a25 : { CLASS(class) } >a AT>d
.a26 : { CLASS(class) } >a AT>d
.a27 : { CLASS(class) } >a AT>d
.a28 : { CLASS(class) } >a AT>d
.a29 : { CLASS(class) } >a AT>d
.a30 : { CLASS(class) } >a AT>d
.b : { CLASS(class) } >b AT>d
}

# RUN: ld.lld -T same-mem-region.lds -o same-mem-region spill.o
# RUN: llvm-readelf -S same-mem-region | FileCheck %s --check-prefix=SAME-MEM-REGION

# SAME-MEM-REGION: Name Type Address Off Size
# SAME-MEM-REGION: .b PROGBITS 0000000000000000 001000 000003

#--- same-lma-region.lds
## Spills to the same load region that overflowed do not consume address assignment passes.
MEMORY {
a : ORIGIN = 0, LENGTH = 0
b : ORIGIN = 0, LENGTH = 3
c : ORIGIN = 3, LENGTH = 3
d : ORIGIN = 6, LENGTH = 3
}
SECTIONS {
CLASS(class) { *(.one_byte_section .two_byte_section) }
.a00 : { CLASS(class) } >c AT>a
.a01 : { CLASS(class) } >d AT>a
.a02 : { CLASS(class) } >d AT>a
.a03 : { CLASS(class) } >d AT>a
.a04 : { CLASS(class) } >d AT>a
.a05 : { CLASS(class) } >d AT>a
.a06 : { CLASS(class) } >d AT>a
.a07 : { CLASS(class) } >d AT>a
.a08 : { CLASS(class) } >d AT>a
.a09 : { CLASS(class) } >d AT>a
.a10 : { CLASS(class) } >d AT>a
.a11 : { CLASS(class) } >d AT>a
.a12 : { CLASS(class) } >d AT>a
.a13 : { CLASS(class) } >d AT>a
.a14 : { CLASS(class) } >d AT>a
.a15 : { CLASS(class) } >d AT>a
.a16 : { CLASS(class) } >d AT>a
.a17 : { CLASS(class) } >d AT>a
.a18 : { CLASS(class) } >d AT>a
.a19 : { CLASS(class) } >d AT>a
.a20 : { CLASS(class) } >d AT>a
.a21 : { CLASS(class) } >d AT>a
.a22 : { CLASS(class) } >d AT>a
.a23 : { CLASS(class) } >d AT>a
.a24 : { CLASS(class) } >d AT>a
.a25 : { CLASS(class) } >d AT>a
.a26 : { CLASS(class) } >d AT>a
.a27 : { CLASS(class) } >d AT>a
.a28 : { CLASS(class) } >d AT>a
.a29 : { CLASS(class) } >d AT>a
.a30 : { CLASS(class) } >d AT>a
.b : { CLASS(class) } >d AT>b
}

# RUN: ld.lld -T same-lma-region.lds -o same-lma-region spill.o
# RUN: llvm-readelf -S same-lma-region | FileCheck %s --check-prefix=SAME-LMA-REGION

# SAME-LMA-REGION: Name Type Address Off Size
# SAME-LMA-REGION: .b PROGBITS 0000000000000006 001006 000003
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