| commit | 06039ae75fa4505de13184f520fe1c6bd0bb7bc9 | [log] [tgz] |
|---|---|---|
| author | Cherry Mui <cherryyz@google.com> | Tue Dec 26 15:35:56 2023 -0500 |
| committer | Cherry Mui <cherryyz@google.com> | Thu Feb 15 13:53:32 2024 -0500 |
| tree | d322f2962644780c1bf257727c6559123631dc9f | |
| parent | b6ca586181f3f1531c01d51d632b50b2c7c784ba [diff] |
cmd/link, runtime: put only function index in method table and func table In the type descriptor's method table, it contains relative PCs of the methods (relative to the start of the text section) stored as 32-bit offsets. On Wasm, a PC is PC_F<<16 + PC_B, where PC_F is the function index, and PC_B is the block index. When there are more than 65536 functions, the PC will not fit into 32-bit (and relative to the section start doesn't help). Since there are no more bits for the function index, and the method table always targets the entry of a method, we put just the PC_F there, and rewrite back to a full PC at run time when we need the PC. This way we can have more than 65536 functions. The func table also contains 32-bit relative PCs, and it also always points to function entries. Do the same. Also add the relocation type in the relocation overflow error message. Also add check for function too big on Wasm. If a function has more than 65536 blocks, PC_B will overflow and PC = PC_F<<16 + PC_B will points to the wrong function. Fixes #64856. Change-Id: If9c307e9fb1641f367a5f19c39f88f455805d0bb
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