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authorBruce Dawson <brucedawson@google.com>2015-01-05 14:11:00 -0800
committerBruce Dawson <brucedawson@google.com>2015-01-05 14:11:00 -0800
commit286ea1d88a41a670a17bd82d85a553c2df53c0c8 (patch)
treec08739f6145351cda20587950af17f300e8b78bb /core
parenta975cfae4719986e5ea0ff06a45b91e1cdd042b3 (diff)
downloadpdfium-286ea1d88a41a670a17bd82d85a553c2df53c0c8.tar.xz
Remove run-time calculation of hash constants in pdfium.
PDFium static initializers must go. Static initializers are prohibited by the style guide. They have negative consequences including increased startup time (from pulling in additional code pages) and reduced sharing of data pages (since the variables can't go in the read-only data segment). This change uses a template struct and typed enums to reproduce JS_CalcHash at run-time. An unsigned long long constant and masking with 0xFFFFFFFF are used to avoid compile errors due to integer overflow of compile-time constants. The HashVerify class is used to check the results, necessary since none of the functions in global.cpp are called when pdfium_test.exe runs. const_expr would be a much cleaner way to implement this change but it is not yet widely supported. On the Windows release build this reduces the code size (.text virtual size) by 0x240 (576) bytes, the .data section by 0x20 bytes (for eight unsigned globals), and the .rdata section by 0x20 bytes (the unneeded string savings, minus the eight unsigned globals now being there). BUG=441899 R=tsepez@chromium.org Review URL: https://codereview.chromium.org/792043005
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