[SCM] WebKit Debian packaging branch, webkit-1.2, updated. upstream/1.1.90-6072-g9a69373
loki at webkit.org
loki at webkit.org
Thu Apr 8 00:58:19 UTC 2010
The following commit has been merged in the webkit-1.2 branch:
commit 15be2dd85ebe22280924133b44eeae3c82ab26fe
Author: loki at webkit.org <loki at webkit.org@268f45cc-cd09-0410-ab3c-d52691b4dbfc>
Date: Fri Jan 8 08:01:40 2010 +0000
Remove an unnecessary cacheFlush from ARM_TRADITIONAL JIT
https://bugs.webkit.org/show_bug.cgi?id=33203
Reviewed by Gavin Barraclough.
* assembler/ARMAssembler.cpp: Remove obsolete linkBranch function.
(JSC::ARMAssembler::executableCopy): Inline a clean linkBranch code.
* assembler/ARMAssembler.h:
(JSC::ARMAssembler::getLdrImmAddress): Use inline function.
(JSC::ARMAssembler::getLdrImmAddressOnPool): Ditto.
(JSC::ARMAssembler::patchPointerInternal): Remove an unnecessary cacheFlush.
(JSC::ARMAssembler::linkJump): Use patchPointerInternal instead of linkBranch.
(JSC::ARMAssembler::linkCall): Ditto.
(JSC::ARMAssembler::relinkCall): Ditto.
git-svn-id: http://svn.webkit.org/repository/webkit/trunk@52977 268f45cc-cd09-0410-ab3c-d52691b4dbfc
diff --git a/JavaScriptCore/ChangeLog b/JavaScriptCore/ChangeLog
index af7e568..b2143e0 100644
--- a/JavaScriptCore/ChangeLog
+++ b/JavaScriptCore/ChangeLog
@@ -1,3 +1,20 @@
+2010-01-08 Gabor Loki <loki at webkit.org>
+
+ Reviewed by Gavin Barraclough.
+
+ Remove an unnecessary cacheFlush from ARM_TRADITIONAL JIT
+ https://bugs.webkit.org/show_bug.cgi?id=33203
+
+ * assembler/ARMAssembler.cpp: Remove obsolete linkBranch function.
+ (JSC::ARMAssembler::executableCopy): Inline a clean linkBranch code.
+ * assembler/ARMAssembler.h:
+ (JSC::ARMAssembler::getLdrImmAddress): Use inline function.
+ (JSC::ARMAssembler::getLdrImmAddressOnPool): Ditto.
+ (JSC::ARMAssembler::patchPointerInternal): Remove an unnecessary cacheFlush.
+ (JSC::ARMAssembler::linkJump): Use patchPointerInternal instead of linkBranch.
+ (JSC::ARMAssembler::linkCall): Ditto.
+ (JSC::ARMAssembler::relinkCall): Ditto.
+
2010-01-07 Gabor Loki <loki at webkit.org>
Reviewed by Gavin Barraclough.
diff --git a/JavaScriptCore/assembler/ARMAssembler.cpp b/JavaScriptCore/assembler/ARMAssembler.cpp
index 098b354..6dd2b87 100644
--- a/JavaScriptCore/assembler/ARMAssembler.cpp
+++ b/JavaScriptCore/assembler/ARMAssembler.cpp
@@ -34,39 +34,6 @@ namespace JSC {
// Patching helpers
-ARMWord* ARMAssembler::getLdrImmAddress(ARMWord* insn, uint32_t* constPool)
-{
- // Must be an ldr ..., [pc +/- imm]
- ASSERT((*insn & 0x0f7f0000) == 0x051f0000);
-
- if (constPool && (*insn & 0x1))
- return reinterpret_cast<ARMWord*>(constPool + ((*insn & SDT_OFFSET_MASK) >> 1));
-
- ARMWord addr = reinterpret_cast<ARMWord>(insn) + 2 * sizeof(ARMWord);
- if (*insn & DT_UP)
- return reinterpret_cast<ARMWord*>(addr + (*insn & SDT_OFFSET_MASK));
- else
- return reinterpret_cast<ARMWord*>(addr - (*insn & SDT_OFFSET_MASK));
-}
-
-void ARMAssembler::linkBranch(void* code, JmpSrc from, void* to, int useConstantPool)
-{
- ARMWord* insn = reinterpret_cast<ARMWord*>(code) + (from.m_offset / sizeof(ARMWord));
-
- if (!useConstantPool) {
- int diff = reinterpret_cast<ARMWord*>(to) - reinterpret_cast<ARMWord*>(insn + 2);
-
- if ((diff <= BOFFSET_MAX && diff >= BOFFSET_MIN)) {
- *insn = B | getConditionalField(*insn) | (diff & BRANCH_MASK);
- ExecutableAllocator::cacheFlush(insn, sizeof(ARMWord));
- return;
- }
- }
- ARMWord* addr = getLdrImmAddress(insn);
- *addr = reinterpret_cast<ARMWord>(to);
- ExecutableAllocator::cacheFlush(addr, sizeof(ARMWord));
-}
-
void ARMAssembler::patchConstantPoolLoad(void* loadAddr, void* constPoolAddr)
{
ARMWord *ldr = reinterpret_cast<ARMWord*>(loadAddr);
@@ -388,10 +355,17 @@ void* ARMAssembler::executableCopy(ExecutablePool* allocator)
// The last bit is set if the constant must be placed on constant pool.
int pos = (*iter) & (~0x1);
ARMWord* ldrAddr = reinterpret_cast<ARMWord*>(data + pos);
- ARMWord offset = *getLdrImmAddress(ldrAddr);
- if (offset != 0xffffffff) {
- JmpSrc jmpSrc(pos);
- linkBranch(data, jmpSrc, data + offset, ((*iter) & 1));
+ ARMWord* addr = getLdrImmAddress(ldrAddr);
+ if (*addr != 0xffffffff) {
+ if (!(*iter & 1)) {
+ int diff = reinterpret_cast<ARMWord*>(data + *addr) - (ldrAddr + DefaultPrefetching);
+
+ if ((diff <= BOFFSET_MAX && diff >= BOFFSET_MIN)) {
+ *ldrAddr = B | getConditionalField(*ldrAddr) | (diff & BRANCH_MASK);
+ continue;
+ }
+ }
+ *addr = reinterpret_cast<ARMWord>(data + *addr);
}
}
diff --git a/JavaScriptCore/assembler/ARMAssembler.h b/JavaScriptCore/assembler/ARMAssembler.h
index ae92124..6967b37 100644
--- a/JavaScriptCore/assembler/ARMAssembler.h
+++ b/JavaScriptCore/assembler/ARMAssembler.h
@@ -183,6 +183,7 @@ namespace JSC {
};
static const ARMWord INVALID_IMM = 0xf0000000;
+ static const int DefaultPrefetching = 2;
class JmpSrc {
friend class ARMAssembler;
@@ -632,15 +633,32 @@ namespace JSC {
// Patching helpers
- static ARMWord* getLdrImmAddress(ARMWord* insn, uint32_t* constPool = 0);
- static void linkBranch(void* code, JmpSrc from, void* to, int useConstantPool = 0);
+ static ARMWord* getLdrImmAddress(ARMWord* insn)
+ {
+ // Must be an ldr ..., [pc +/- imm]
+ ASSERT((*insn & 0x0f7f0000) == 0x051f0000);
+
+ ARMWord addr = reinterpret_cast<ARMWord>(insn) + DefaultPrefetching * sizeof(ARMWord);
+ if (*insn & DT_UP)
+ return reinterpret_cast<ARMWord*>(addr + (*insn & SDT_OFFSET_MASK));
+ return reinterpret_cast<ARMWord*>(addr - (*insn & SDT_OFFSET_MASK));
+ }
+
+ static ARMWord* getLdrImmAddressOnPool(ARMWord* insn, uint32_t* constPool)
+ {
+ // Must be an ldr ..., [pc +/- imm]
+ ASSERT((*insn & 0x0f7f0000) == 0x051f0000);
+
+ if (*insn & 0x1)
+ return reinterpret_cast<ARMWord*>(constPool + ((*insn & SDT_OFFSET_MASK) >> 1));
+ return getLdrImmAddress(insn);
+ }
static void patchPointerInternal(intptr_t from, void* to)
{
ARMWord* insn = reinterpret_cast<ARMWord*>(from);
ARMWord* addr = getLdrImmAddress(insn);
*addr = reinterpret_cast<ARMWord>(to);
- ExecutableAllocator::cacheFlush(addr, sizeof(ARMWord));
}
static ARMWord patchConstantPoolLoad(ARMWord load, ARMWord value)
@@ -685,12 +703,13 @@ namespace JSC {
void linkJump(JmpSrc from, JmpDst to)
{
ARMWord* insn = reinterpret_cast<ARMWord*>(m_buffer.data()) + (from.m_offset / sizeof(ARMWord));
- *getLdrImmAddress(insn, m_buffer.poolAddress()) = static_cast<ARMWord>(to.m_offset);
+ ARMWord* addr = getLdrImmAddressOnPool(insn, m_buffer.poolAddress());
+ *addr = static_cast<ARMWord>(to.m_offset);
}
static void linkJump(void* code, JmpSrc from, void* to)
{
- linkBranch(code, from, to);
+ patchPointerInternal(reinterpret_cast<intptr_t>(code) + from.m_offset, to);
}
static void relinkJump(void* from, void* to)
@@ -700,12 +719,12 @@ namespace JSC {
static void linkCall(void* code, JmpSrc from, void* to)
{
- linkBranch(code, from, to, true);
+ patchPointerInternal(reinterpret_cast<intptr_t>(code) + from.m_offset, to);
}
static void relinkCall(void* from, void* to)
{
- relinkJump(from, to);
+ patchPointerInternal(reinterpret_cast<intptr_t>(from) - sizeof(ARMWord), to);
}
// Address operations
--
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