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| author | Ayke van Laethem <[email protected]> | 2021-01-06 01:05:33 +0100 |
|---|---|---|
| committer | Ron Evans <[email protected]> | 2021-01-06 19:41:47 +0100 |
| commit | a4d0877cf0707c10585cdce8cd2bc02b13004efd (patch) | |
| tree | 81d8eb1efacd13f7138bcc8d399309dcad8939b7 /stacksize | |
| parent | 6ec868710bc70ba1e40413f23df5bbc4f8cd889a (diff) | |
| download | tinygo-a4d0877cf0707c10585cdce8cd2bc02b13004efd.tar.gz tinygo-a4d0877cf0707c10585cdce8cd2bc02b13004efd.zip | |
stacksize: add support for DW_CFA_offset_extended
It should be possible to ignore this directive, but we still have to
consume the two operands.
Diffstat (limited to 'stacksize')
| -rw-r--r-- | stacksize/dwarf.go | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/stacksize/dwarf.go b/stacksize/dwarf.go index d4e714277..0ba880a4c 100644 --- a/stacksize/dwarf.go +++ b/stacksize/dwarf.go @@ -190,6 +190,8 @@ func (fi *frameInfo) exec(bytecode []byte) ([]frameInfoLine, error) { } return nil, err } + // For details on the various opcodes, see: + // http://dwarfstd.org/doc/DWARF5.pdf (page 239) highBits := op >> 6 // high order 2 bits lowBits := op & 0x1f switch highBits { @@ -217,6 +219,17 @@ func (fi *frameInfo) exec(bytecode []byte) ([]frameInfoLine, error) { fi.loc += uint64(offset) * fi.cie.codeAlignmentFactor entries = append(entries, fi.newLine()) // TODO: DW_CFA_advance_loc2 etc + case 0x05: // DW_CFA_offset_extended + // Semantics are the same as DW_CFA_offset, but the encoding is + // different. Ignore it just like DW_CFA_offset. + _, err := readULEB128(r) // ULEB128 register + if err != nil { + return nil, err + } + _, err = readULEB128(r) // ULEB128 offset + if err != nil { + return nil, err + } case 0x07: // DW_CFA_undefined // Marks a single register as undefined. This is used to stop // unwinding in tinygo_startTask using: |