Changeset 288476 in webkit for trunk/Source/JavaScriptCore/jit/GPRInfo.h

Timestamp:

Jan 24, 2022, 3:20:23 PM (3 years ago)

Author:

Mikhail R. Gadelha

Message:

[JSC][32bit] Fix regexp crash on ARMv7
​https://bugs.webkit.org/show_bug.cgi?id=234476

Reviewed by Yusuke Suzuki.

This patch fixes several regexp crashes on ARMv7 due to an incorrect
offset to retrieve the 5th argument from the stack: in ARMv7, only
4 arguments are passed via registers r0-r3i, and any other argument is
placed on the stack, however, YarrJIT was trying to get the 5th arg
from a fixed offset, so because the generateEnter() method pushed
register into the stack, the offset was wrong. This patch fixes how
the offset is calculated for MIPS and ARMv7.

This patch also introduces some small changes:

1. Added static_asserts that the YarrJIT calls do indeed have 5 arguments

and that the 5th argument has the type that we expect (MatchingContextHolder*).

2. Removed an unnecessary pointer from the MatchingContextHolder

constructor.

3. Fixed some warnings in the YarrJIT code here and there.

• dfg/DFGSpeculativeJIT64.cpp:

(JSC::DFG::SpeculativeJIT::compileRegExpTestInline):

• runtime/RegExpInlines.h:

(JSC::RegExp::matchInline):

• yarr/YarrJIT.cpp:
• yarr/YarrMatchingContextHolder.h:

(JSC::Yarr::MatchingContextHolder::MatchingContextHolder):

File:

• trunk/Source/JavaScriptCore/jit/GPRInfo.h (modified) (2 diffs)

trunk/Source/JavaScriptCore/jit/GPRInfo.h

@@ -627 +627 @@
     typedef GPRReg RegisterType;
     static constexpr unsigned numberOfRegisters = 16;
-    static constexpr unsigned numberOfArgumentRegisters = 8;
+    static constexpr unsigned numberOfArgumentRegisters = NUMBER_OF_ARGUMENT_REGISTERS;
 
     // These registers match the baseline JIT.
@@ -826 +826 @@
     typedef GPRReg RegisterType;
     static constexpr unsigned numberOfRegisters = 13;
-    static constexpr unsigned numberOfArgumentRegisters = 8;
+    static constexpr unsigned numberOfArgumentRegisters = NUMBER_OF_ARGUMENT_REGISTERS;
 
     static constexpr GPRReg callFrameRegister = RISCV64Registers::fp;