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platform_system_core
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ACC ARM codegen: Implement calling indirect functions.

This commit is contained in:
Jack Palevich 2009-05-15 14:31:47 -07:00
parent 4d93f30bef
commit 7810bc9abd
1 changed files with 40 additions and 29 deletions
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69
libacc/acc.cpp
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@ -168,9 +168,10 @@ class compiler {
virtual int beginFunctionCallArguments() = 0;
virtual void storeEAToArg(int l) = 0;
virtual void endFunctionCallArguments(int a, int l) = 0;
virtual void storeEAToArg(int l) = 0;
virtual int callForward(int symbol) = 0;
@ -178,7 +179,7 @@ class compiler {
virtual void callIndirect(int l) = 0;
virtual void adjustStackAfterCall(int l) = 0;
virtual void adjustStackAfterCall(int l, bool isIndirect) = 0;
virtual int disassemble(FILE* out) = 0;
@ -519,6 +520,14 @@ class compiler {
return o4(0xE24DDF00); // Placeholder
}
virtual void storeEAToArg(int l) {
fprintf(stderr, "storeEAToArg(%d);\n", l);
if (l < 0 || l > 4096-4) {
error("l out of range for stack offset: 0x%08x", l);
}
o4(0xE58D0000 + l); // str r0, [sp, #4]
}
virtual void endFunctionCallArguments(int a, int l) {
fprintf(stderr, "endFunctionCallArguments(0x%08x, %d);\n", a, l);
if (l < 0 || l > 0x3FC) {
@ -532,14 +541,6 @@ class compiler {
}
}
virtual void storeEAToArg(int l) {
fprintf(stderr, "storeEAToArg(%d);\n", l);
if (l < 0 || l > 4096-4) {
error("l out of range for stack offset: 0x%08x", l);
}
o4(0xE58D0000 + l); // str r0, [sp, #4]
}
virtual int callForward(int symbol) {
fprintf(stderr, "callForward(%d);\n", symbol);
// Forward calls are always short (local)
@ -564,20 +565,27 @@ class compiler {
virtual void callIndirect(int l) {
fprintf(stderr, "callIndirect(%d);\n", l);
oad(0x2494ff, l); /* call *xxx(%esp) */
int argCount = l >> 2;
int poppedArgs = argCount > 4 ? 4 : argCount;
int adjustedL = l - (poppedArgs << 2);
if (adjustedL < 0 || adjustedL > 4096-4) {
error("l out of range for stack offset: 0x%08x", l);
}
o4(0xE59DC000 | (0xfff & adjustedL)); // ldr r12, [sp,#adjustedL]
o4(0xE12FFF3C); // blx r12
}
virtual void adjustStackAfterCall(int l) {
fprintf(stderr, "adjustStackAfterCall(%d);\n", l);
if (l < 0 || l > 0x3FC) {
error("L out of range for stack adjustment: 0x%08x", l);
}
virtual void adjustStackAfterCall(int l, bool isIndirect) {
fprintf(stderr, "adjustStackAfterCall(%d, %d);\n", l, isIndirect);
int argCount = l >> 2;
if (argCount > 4) {
int remainingArgs = argCount - 4;
o4(0xE28DDF00 | remainingArgs); // add sp, sp, #0x3fc
int stackArgs = argCount > 4 ? argCount - 4 : 0;
int stackUse = stackArgs + (isIndirect ? 1 : 0);
if (stackUse) {
if (stackUse < 0 || stackUse > 255) {
error("L out of range for stack adjustment: 0x%08x", l);
}
o4(0xE28DDF00 | stackUse); // add sp, sp, #stackUse << 2
}
}
virtual int jumpOffset() {
@ -620,6 +628,7 @@ class compiler {
}
return 0;
}
private:
static FILE* disasmOut;
@ -763,14 +772,14 @@ class compiler {
return oad(0xec81, 0); /* sub $xxx, %esp */
}
virtual void endFunctionCallArguments(int a, int l) {
* (int*) a = l;
}
virtual void storeEAToArg(int l) {
oad(0x248489, l); /* movl %eax, xxx(%esp) */
}
virtual void endFunctionCallArguments(int a, int l) {
* (int*) a = l;
}
virtual int callForward(int symbol) {
return psym(0xe8, symbol); /* call xxx */
}
@ -783,7 +792,10 @@ class compiler {
oad(0x2494ff, l); /* call *xxx(%esp) */
}
virtual void adjustStackAfterCall(int l) {
virtual void adjustStackAfterCall(int l, bool isIndirect) {
if (isIndirect) {
l += 4;
}
oad(0xc481, l); /* add $xxx, %esp */
}
@ -1174,12 +1186,11 @@ class compiler {
*(int *) t = pGen->callForward(*(int *) t);
} else if (n == 1) {
pGen->callIndirect(l);
l = l + 4;
} else {
pGen->callRelative(n - codeBuf.getPC() - pGen->jumpOffset()); /* call xxx */
pGen->callRelative(n - codeBuf.getPC() - pGen->jumpOffset());
}
if (l)
pGen->adjustStackAfterCall(l);
if (l || n == 1)
pGen->adjustStackAfterCall(l, n == 1);
}
}