Skip to content

[lld][WebAssembly] Add missing relocation types to the --compress-relocations path #144578

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Open
wants to merge 6 commits into
base: main
Choose a base branch
from
Open

[lld][WebAssembly] Add missing relocation types to the --compress-relocations path #144578

Show file tree
Hide file tree
Changes from 3 commits
Commits
Show all changes
6 commits
Select commit Hold shift + click to select a range
6e1ccf9
Add missing relocation types to the --compress-relocs path
SingleAccretion Jun 17, 2025
34e2f30
Better error handling
SingleAccretion Jun 18, 2025
fc8ef56
Add testing for all handled relocs
SingleAccretion Jun 18, 2025
cd95cf8
Rename test function, remove newlines
SingleAccretion Jun 18, 2025
f60da1b
Make missing reloc cases warn
SingleAccretion Jun 18, 2025
8b910b0
Formatting fix
SingleAccretion Jun 19, 2025
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
26 changes: 0 additions & 26 deletions lld/test/wasm/compress-relocs.ll
View file
Open in desktop

This file was deleted.

130 changes: 130 additions & 0 deletions lld/test/wasm/compress-relocs.s
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -0,0 +1,130 @@
# RUN: llvm-mc -mattr=+reference-types,+exception-handling -filetype=obj -triple=wasm32-unknown-unknown %s -o %t.o
# RUN: wasm-ld --export-dynamic -o %t.wasm %t.o
# RUN: llvm-objdump -d %t.wasm | FileCheck %s
# RUN: wasm-ld --export-dynamic -O2 -o %t-opt.wasm %t.o
# RUN: llvm-objdump -d %t-opt.wasm | FileCheck %s
# RUN: not wasm-ld --compress-relocations -o %t-compressed.wasm %t.o 2>&1 | FileCheck %s -check-prefix=ERROR
# RUN: wasm-ld --export-dynamic --strip-debug --compress-relocations -o %t-compressed.wasm %t.o
# RUN: llvm-objdump -d %t-compressed.wasm | FileCheck %s -check-prefix=COMPRESS

.globl _start
_start:
.functype _start () -> ()
end_function

.globl func_ret_i64
func_ret_i64:
.functype func_ret_i64 () -> (i64)
i64.const 1
end_function

.globl func_ret_i32
func_ret_i32:
.functype func_ret_i32 () -> (i32)
i32.const 2
end_function

i32_global:
.globaltype i32_global, i32

i32_tag:
.tagtype i32_tag i32

.globl test_memory_and_indirect_call_relocs
test_memory_and_indirect_call_relocs:
.functype test_memory_and_indirect_call_relocs () -> ()
i32.const indirect_func_ret_i64 # R_WASM_MEMORY_ADDR_SLEB
i32.load 0
call_indirect () -> (i64) # R_WASM_TYPE_INDEX_LEB, R_WASM_TABLE_NUMBER_LEB
drop
i32.const 0
i32.load indirect_func_ret_i32 # R_WASM_MEMORY_ADDR_LEB
call_indirect () -> (i32)
drop
i32.const func_ret_i64 # R_WASM_TABLE_INDEX_SLEB
call_indirect () -> (i64)
drop
end_function

# CHECK: test_memory_and_indirect_call_relocs
# CHECK: 41 90 88 80 80 00 i32.const 1040
# CHECK: 11 80 80 80 80 00 80 80 80 80 00 call_indirect 0
# CHECK: 28 02 94 88 80 80 00 i32.load 1044
# CHECK: 11 81 80 80 80 00 80 80 80 80 00 call_indirect 1
# CHECK: 41 81 80 80 80 00 i32.const 1
# CHECK: 11 80 80 80 80 00 80 80 80 80 00 call_indirect 0
# COMPRESS: test_memory_and_indirect_call_relocs
# COMPRESS: 41 90 08 i32.const 1040
# COMPRESS: 11 00 00 call_indirect 0
# COMPRESS: 28 02 94 08 i32.load 1044
# COMPRESS: 11 01 00 call_indirect 1
# COMPRESS: 41 01 i32.const 1
# COMPRESS: 11 00 00 call_indirect 0

.globl test_simple_index_relocs
test_simple_index_relocs:
.functype test_simple_index_relocs () -> ()
call func_ret_i32 # R_WASM_FUNCTION_INDEX_LEB
global.set i32_global # R_WASM_GLOBAL_INDEX_LEB
i32.const 0
throw i32_tag # R_WASM_TAG_INDEX_LEB
end_function

# CHECK: test_simple_index_relocs
# CHECK: 10 82 80 80 80 00 call 2
# CHECK: 24 81 80 80 80 00 global.set 1
# CHECK: 08 80 80 80 80 00 throw 0
# COMPRESS: test_simple_index_relocs
# COMPRESS: 10 02 call 2
# COMPRESS: 24 01 global.set 1
# COMPRESS: 08 00 throw 0

.globl test_special_relocs
test_special_relocs:
.functype test_special_relocs () -> ()
i32.const indirect_func_ret_i64@MBREL # R_WASM_MEMORY_ADDR_REL_SLEB
drop
i32.const func_ret_i32@TBREL # R_WASM_TABLE_INDEX_REL_SLEB
drop
i32.const i32_tls_data@TLSREL # R_WASM_MEMORY_ADDR_TLS_SLEB
drop
end_function

# CHECK: test_special_relocs
# CHECK: 41 90 88 80 80 00 i32.const 1040
# CHECK: 41 81 80 80 80 00 i32.const 1
# CHECK: 41 83 80 80 80 00 i32.const 3
# COMPRESS: test_special_relocs
# COMPRESS: 41 90 08 i32.const 1040
# COMPRESS: 41 01 i32.const 1
# COMPRESS: 41 03 i32.const 3

# ERROR: wasm-ld: error: --compress-relocations is incompatible with output debug information. Please pass --strip-debug or --strip-all

.section .tdata,"T",@
.int8 0
.int8 0
.int8 0
i32_tls_data:
.int32 65
.size i32_tls_data, 4

.section .data,"",@
.p2align 4
indirect_func_ret_i64:
.int32 func_ret_i64
.size indirect_func_ret_i64, 4

indirect_func_ret_i32:
.int32 func_ret_i32
.size indirect_func_ret_i32, 4

.section .custom_section.target_features,"",@
.int8 2
.int8 43
.int8 7
.ascii "atomics"
.int8 43
.int8 11
.ascii "bulk-memory"

93 changes: 93 additions & 0 deletions lld/test/wasm/compress-relocs64.s
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -0,0 +1,93 @@
# RUN: llvm-mc -filetype=obj -triple=wasm64-unknown-unknown %s -o %t.o
# RUN: wasm-ld -mwasm64 --export-dynamic -o %t.wasm %t.o
# RUN: llvm-objdump -d %t.wasm | FileCheck %s
# RUN: wasm-ld -mwasm64 --export-dynamic -O2 -o %t-opt.wasm %t.o
# RUN: llvm-objdump -d %t-opt.wasm | FileCheck %s
# RUN: wasm-ld -mwasm64 --export-dynamic --strip-debug --compress-relocations -o %t-compressed.wasm %t.o
# RUN: llvm-objdump -d %t-compressed.wasm | FileCheck %s -check-prefix=COMPRESS

.globl _start
_start:
.functype _start () -> ()
end_function

.globl func_ret_i64
func_ret_i64:
.functype func_ret_i64 () -> (i64)
i64.const 1
end_function

.globl func_ret_i32
func_ret_i32:
.functype func_ret_i32 () -> (i32)
i32.const 2
end_function

.globl test_memory_and_indirect_call_relocs
test_memory_and_indirect_call_relocs:
.functype test_memory_and_indirect_call_relocs () -> ()
i64.const indirect_func_ret_i64 # R_WASM_MEMORY_ADDR_SLEB64
drop
i64.const 0
i64.load indirect_func_ret_i32 # R_WASM_MEMORY_ADDR_LEB64
drop
i64.const func_ret_i64 # R_WASM_TABLE_INDEX_SLEB64
drop
end_function

# CHECK: test_memory_and_indirect_call_relocs
# CHECK: 42 90 88 80 80 80 80 80 80 80 00 i64.const 1040
# CHECK: 29 03 98 88 80 80 80 80 80 80 80 00 i64.load 1048
# CHECK: 42 81 80 80 80 80 80 80 80 80 00 i64.const 1
# COMPRESS: test_memory_and_indirect_call_relocs
# COMPRESS: 42 90 08 i64.const 1040
# COMPRESS: 29 03 98 08 i64.load 1048
# COMPRESS: 42 01 i64.const 1

.globl test_special_relocs
test_special_relocs:
.functype test_special_relocs () -> ()
i64.const indirect_func_ret_i64@MBREL # R_WASM_MEMORY_ADDR_REL_SLEB64
drop
i64.const func_ret_i32@TBREL # R_WASM_TABLE_INDEX_REL_SLEB64
drop
i64.const i32_tls_data@TLSREL # R_WASM_MEMORY_ADDR_TLS_SLEB64
drop
end_function

# CHECK: test_special_relocs
# CHECK: 42 90 88 80 80 80 80 80 80 80 00 i64.const 1040
# CHECK: 42 81 80 80 80 80 80 80 80 80 00 i64.const 1
# CHECK: 42 83 80 80 80 80 80 80 80 80 00 i64.const 3
# COMPRESS: test_special_relocs
# COMPRESS: 42 90 08 i64.const 1040
# COMPRESS: 42 01 i64.const 1
# COMPRESS: 42 03 i64.const 3

.section .tdata,"T",@
.int8 0
.int8 0
.int8 0
i32_tls_data:
.int32 65
.size i32_tls_data, 4

.section .data,"",@
.p2align 4
indirect_func_ret_i64:
.int64 func_ret_i64
.size indirect_func_ret_i64, 8

indirect_func_ret_i32:
.int64 func_ret_i32
.size indirect_func_ret_i32, 8

.section .custom_section.target_features,"",@
.int8 2
.int8 43
.int8 7
.ascii "atomics"
.int8 43
.int8 11
.ascii "bulk-memory"

18 changes: 16 additions & 2 deletions lld/wasm/InputChunks.cpp
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -239,11 +239,18 @@ static unsigned writeCompressedReloc(uint8_t *buf, const WasmRelocation &rel,
return encodeULEB128(value, buf);
case R_WASM_TABLE_INDEX_SLEB:
case R_WASM_TABLE_INDEX_SLEB64:
case R_WASM_TABLE_INDEX_REL_SLEB64:
case R_WASM_MEMORY_ADDR_SLEB:
case R_WASM_MEMORY_ADDR_SLEB64:
case R_WASM_MEMORY_ADDR_REL_SLEB:
case R_WASM_MEMORY_ADDR_REL_SLEB64:
case R_WASM_MEMORY_ADDR_TLS_SLEB:
case R_WASM_MEMORY_ADDR_TLS_SLEB64:
case R_WASM_TABLE_INDEX_REL_SLEB:
return encodeSLEB128(static_cast<int64_t>(value), buf);
default:
llvm_unreachable("unexpected relocation type");
fatal("relocation compression not supported for " +
relocTypeToString(rel.Type));
}
}

Expand All @@ -256,14 +263,21 @@ static unsigned getRelocWidthPadded(const WasmRelocation &rel) {
case R_WASM_MEMORY_ADDR_LEB:
case R_WASM_TABLE_NUMBER_LEB:
case R_WASM_TABLE_INDEX_SLEB:
case R_WASM_TABLE_INDEX_REL_SLEB:
case R_WASM_MEMORY_ADDR_SLEB:
case R_WASM_MEMORY_ADDR_REL_SLEB:
case R_WASM_MEMORY_ADDR_TLS_SLEB:
return 5;
case R_WASM_TABLE_INDEX_SLEB64:
case R_WASM_TABLE_INDEX_REL_SLEB64:
case R_WASM_MEMORY_ADDR_LEB64:
case R_WASM_MEMORY_ADDR_SLEB64:
case R_WASM_MEMORY_ADDR_REL_SLEB64:
case R_WASM_MEMORY_ADDR_TLS_SLEB64:
return 10;
default:
llvm_unreachable("unexpected relocation type");
fatal("relocation compression not supported for " +
relocTypeToString(rel.Type));
}
}

Expand Down