[PATCH] D57479: [WebAssembly] MC: Fix for outputing wasm object to /dev/null
Phabricator via Phabricator via llvm-commits
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Thu Jan 31 14:38:16 PST 2019
This revision was automatically updated to reflect the committed changes.
Closed by commit rL352806: [WebAssembly] MC: Fix for outputing wasm object to /dev/null (authored by sbc, committed by ).
Changed prior to commit:
https://reviews.llvm.org/D57479?vs=184581&id=184613#toc
Repository:
rL LLVM
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D57479/new/
https://reviews.llvm.org/D57479
Files:
llvm/trunk/lib/MC/WasmObjectWriter.cpp
llvm/trunk/test/MC/WebAssembly/null-output.s
Index: llvm/trunk/lib/MC/WasmObjectWriter.cpp
===================================================================
--- llvm/trunk/lib/MC/WasmObjectWriter.cpp
+++ llvm/trunk/lib/MC/WasmObjectWriter.cpp
@@ -398,7 +398,13 @@
// Now that the section is complete and we know how big it is, patch up the
// section size field at the start of the section.
void WasmObjectWriter::endSection(SectionBookkeeping &Section) {
- uint64_t Size = W.OS.tell() - Section.PayloadOffset;
+ uint64_t Size = W.OS.tell();
+ // /dev/null doesn't support seek/tell and can report offset of 0.
+ // Simply skip this patching in that case.
+ if (!Size)
+ return;
+
+ Size -= Section.PayloadOffset;
if (uint32_t(Size) != Size)
report_fatal_error("section size does not fit in a uint32_t");
Index: llvm/trunk/test/MC/WebAssembly/null-output.s
===================================================================
--- llvm/trunk/test/MC/WebAssembly/null-output.s
+++ llvm/trunk/test/MC/WebAssembly/null-output.s
@@ -0,0 +1,10 @@
+# RUN: llvm-mc -triple=wasm32-unknown-unknown -filetype=obj -o /dev/null < %s
+
+ .text
+ .section .text.main,"",@
+ .type main, at function
+main:
+ .functype main (i32, i32) -> (i32)
+ end_function
+.Lfunc_end0:
+ .size main, .Lfunc_end0-main
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